14466 lines
325 KiB
C
14466 lines
325 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* ash shell port for busybox
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Kenneth Almquist.
|
|
*
|
|
* Original BSD copyright notice is retained at the end of this file.
|
|
*
|
|
* Copyright (c) 1989, 1991, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
|
|
* was re-ported from NetBSD and debianized.
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
//config:config ASH
|
|
//config: bool "ash (78 kb)"
|
|
//config: default y
|
|
//config: depends on !NOMMU
|
|
//config: help
|
|
//config: The most complete and most pedantically correct shell included with
|
|
//config: busybox. This shell is actually a derivative of the Debian 'dash'
|
|
//config: shell (by Herbert Xu), which was created by porting the 'ash' shell
|
|
//config: (written by Kenneth Almquist) from NetBSD.
|
|
//config:
|
|
//config:# ash options
|
|
//config:# note: Don't remove !NOMMU part in the next line; it would break
|
|
//config:# menuconfig's indenting.
|
|
//config:if !NOMMU && (ASH || SH_IS_ASH || BASH_IS_ASH)
|
|
//config:
|
|
//config:config ASH_OPTIMIZE_FOR_SIZE
|
|
//config: bool "Optimize for size instead of speed"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config:
|
|
//config:config ASH_INTERNAL_GLOB
|
|
//config: bool "Use internal glob() implementation"
|
|
//config: default y # Y is bigger, but because of uclibc glob() bug, let Y be default for now
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config: help
|
|
//config: Do not use glob() function from libc, use internal implementation.
|
|
//config: Use this if you are getting "glob.h: No such file or directory"
|
|
//config: or similar build errors.
|
|
//config: Note that as of now (2017-01), uclibc and musl glob() both have bugs
|
|
//config: which would break ash if you select N here.
|
|
//config:
|
|
//config:config ASH_BASH_COMPAT
|
|
//config: bool "bash-compatible extensions"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config:
|
|
//config:config ASH_BASH_SOURCE_CURDIR
|
|
//config: bool "'source' and '.' builtins search current directory after $PATH"
|
|
//config: default n # do not encourage non-standard behavior
|
|
//config: depends on ASH_BASH_COMPAT
|
|
//config: help
|
|
//config: This is not compliant with standards. Avoid if possible.
|
|
//config:
|
|
//config:config ASH_BASH_NOT_FOUND_HOOK
|
|
//config: bool "command_not_found_handle hook support"
|
|
//config: default y
|
|
//config: depends on ASH_BASH_COMPAT
|
|
//config: help
|
|
//config: Enable support for the 'command_not_found_handle' hook function,
|
|
//config: from GNU bash, which allows for alternative command not found
|
|
//config: handling.
|
|
//config:
|
|
//config:config ASH_JOB_CONTROL
|
|
//config: bool "Job control"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config:
|
|
//config:config ASH_ALIAS
|
|
//config: bool "Alias support"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config:
|
|
//config:config ASH_RANDOM_SUPPORT
|
|
//config: bool "Pseudorandom generator and $RANDOM variable"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config: help
|
|
//config: Enable pseudorandom generator and dynamic variable "$RANDOM".
|
|
//config: Each read of "$RANDOM" will generate a new pseudorandom value.
|
|
//config: You can reset the generator by using a specified start value.
|
|
//config: After "unset RANDOM" the generator will switch off and this
|
|
//config: variable will no longer have special treatment.
|
|
//config:
|
|
//config:config ASH_EXPAND_PRMT
|
|
//config: bool "Expand prompt string"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config: help
|
|
//config: $PS# may contain volatile content, such as backquote commands.
|
|
//config: This option recreates the prompt string from the environment
|
|
//config: variable each time it is displayed.
|
|
//config:
|
|
//config:config ASH_IDLE_TIMEOUT
|
|
//config: bool "Idle timeout variable $TMOUT"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config: help
|
|
//config: Enable bash-like auto-logout after $TMOUT seconds of idle time.
|
|
//config:
|
|
//config:config ASH_MAIL
|
|
//config: bool "Check for new mail in interactive shell"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config: help
|
|
//config: Enable "check for new mail" function:
|
|
//config: if set, $MAIL file and $MAILPATH list of files
|
|
//config: are checked for mtime changes, and "you have mail"
|
|
//config: message is printed if change is detected.
|
|
//config:
|
|
//config:config ASH_ECHO
|
|
//config: bool "echo builtin"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config:
|
|
//config:config ASH_PRINTF
|
|
//config: bool "printf builtin"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config:
|
|
//config:config ASH_TEST
|
|
//config: bool "test builtin"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config:
|
|
//config:config ASH_HELP
|
|
//config: bool "help builtin"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config:
|
|
//config:config ASH_GETOPTS
|
|
//config: bool "getopts builtin"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config:
|
|
//config:config ASH_CMDCMD
|
|
//config: bool "command builtin"
|
|
//config: default y
|
|
//config: depends on ASH || SH_IS_ASH || BASH_IS_ASH
|
|
//config: help
|
|
//config: Enable support for the 'command' builtin, which allows
|
|
//config: you to run the specified command or builtin,
|
|
//config: even when there is a function with the same name.
|
|
//config:
|
|
//config:endif # ash options
|
|
|
|
//applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
|
|
// APPLET_ODDNAME:name main location suid_type help
|
|
//applet:IF_SH_IS_ASH( APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, ash))
|
|
//applet:IF_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, ash))
|
|
|
|
//kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
|
|
//kbuild:lib-$(CONFIG_SH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o
|
|
//kbuild:lib-$(CONFIG_BASH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o
|
|
//kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
|
|
|
|
/*
|
|
* DEBUG=1 to compile in debugging ('set -o debug' turns on)
|
|
* DEBUG=2 to compile in and turn on debugging.
|
|
* When debugging is on ("set -o debug" was executed, or DEBUG=2),
|
|
* debugging info is written to ./trace, quit signal generates core dump.
|
|
*/
|
|
#define DEBUG 0
|
|
/* Tweak debug output verbosity here */
|
|
#define DEBUG_TIME 0
|
|
#define DEBUG_PID 1
|
|
#define DEBUG_SIG 1
|
|
#define DEBUG_INTONOFF 0
|
|
|
|
#define PROFILE 0
|
|
|
|
#define JOBS ENABLE_ASH_JOB_CONTROL
|
|
|
|
#include <fnmatch.h>
|
|
#include <sys/times.h>
|
|
#include <sys/utsname.h> /* for setting $HOSTNAME */
|
|
#include "busybox.h" /* for applet_names */
|
|
#if ENABLE_FEATURE_SH_EMBEDDED_SCRIPTS
|
|
# include "embedded_scripts.h"
|
|
#else
|
|
# define NUM_SCRIPTS 0
|
|
#endif
|
|
|
|
/* So far, all bash compat is controlled by one config option */
|
|
/* Separate defines document which part of code implements what */
|
|
/* function keyword */
|
|
#define BASH_FUNCTION ENABLE_ASH_BASH_COMPAT
|
|
#define IF_BASH_FUNCTION IF_ASH_BASH_COMPAT
|
|
/* &>file */
|
|
#define BASH_REDIR_OUTPUT ENABLE_ASH_BASH_COMPAT
|
|
#define IF_BASH_REDIR_OUTPUT IF_ASH_BASH_COMPAT
|
|
/* $'...' */
|
|
#define BASH_DOLLAR_SQUOTE ENABLE_ASH_BASH_COMPAT
|
|
#define IF_BASH_DOLLAR_SQUOTE IF_ASH_BASH_COMPAT
|
|
#define BASH_PATTERN_SUBST ENABLE_ASH_BASH_COMPAT
|
|
#define IF_BASH_PATTERN_SUBST IF_ASH_BASH_COMPAT
|
|
#define BASH_SUBSTR ENABLE_ASH_BASH_COMPAT
|
|
#define IF_BASH_SUBSTR IF_ASH_BASH_COMPAT
|
|
/* BASH_TEST2: [[ EXPR ]]
|
|
* Status of [[ support:
|
|
* We replace && and || with -a and -o
|
|
* TODO:
|
|
* singleword+noglob expansion:
|
|
* v='a b'; [[ $v = 'a b' ]]; echo 0:$?
|
|
* [[ /bin/n* ]]; echo 0:$?
|
|
* -a/-o are not AND/OR ops! (they are just strings)
|
|
* quoting needs to be considered (-f is an operator, "-f" and ""-f are not; etc)
|
|
* = is glob match operator, not equality operator: STR = GLOB
|
|
* (in GLOB, quoting is significant on char-by-char basis: a*cd"*")
|
|
* == same as =
|
|
* add =~ regex match operator: STR =~ REGEX
|
|
*/
|
|
#define BASH_TEST2 (ENABLE_ASH_BASH_COMPAT * ENABLE_ASH_TEST)
|
|
#define BASH_SOURCE ENABLE_ASH_BASH_COMPAT
|
|
#define BASH_PIPEFAIL ENABLE_ASH_BASH_COMPAT
|
|
#define BASH_HOSTNAME_VAR ENABLE_ASH_BASH_COMPAT
|
|
#define BASH_EPOCH_VARS ENABLE_ASH_BASH_COMPAT
|
|
#define BASH_SHLVL_VAR ENABLE_ASH_BASH_COMPAT
|
|
#define BASH_XTRACEFD ENABLE_ASH_BASH_COMPAT
|
|
#define BASH_READ_D ENABLE_ASH_BASH_COMPAT
|
|
#define IF_BASH_READ_D IF_ASH_BASH_COMPAT
|
|
#define BASH_WAIT_N ENABLE_ASH_BASH_COMPAT
|
|
|
|
#if defined(__ANDROID_API__) && __ANDROID_API__ <= 24
|
|
/* Bionic at least up to version 24 has no glob() */
|
|
# undef ENABLE_ASH_INTERNAL_GLOB
|
|
# define ENABLE_ASH_INTERNAL_GLOB 1
|
|
#endif
|
|
|
|
#if !ENABLE_ASH_INTERNAL_GLOB && defined(__UCLIBC__)
|
|
# error uClibc glob() is buggy, use ASH_INTERNAL_GLOB.
|
|
# error The bug is: for "$PWD"/<pattern> ash will escape e.g. dashes in "$PWD"
|
|
# error with backslash, even ones which do not need to be: "/a-b" -> "/a\-b"
|
|
# error glob() should unbackslash them and match. uClibc does not unbackslash,
|
|
# error fails to match dirname, subsequently not expanding <pattern> in it.
|
|
// Testcase:
|
|
// if (glob("/etc/polkit\\-1", 0, NULL, &pglob)) - this returns 0 on uclibc, no bug
|
|
// if (glob("/etc/polkit\\-1/*", 0, NULL, &pglob)) printf("uclibc bug!\n");
|
|
#endif
|
|
|
|
#if !ENABLE_ASH_INTERNAL_GLOB
|
|
# include <glob.h>
|
|
#endif
|
|
|
|
#include "unicode.h"
|
|
#include "shell_common.h"
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
# include "math.h"
|
|
#else
|
|
typedef long arith_t;
|
|
# define ARITH_FMT "%ld"
|
|
#endif
|
|
#if ENABLE_ASH_RANDOM_SUPPORT
|
|
# include "random.h"
|
|
#else
|
|
# define CLEAR_RANDOM_T(rnd) ((void)0)
|
|
#endif
|
|
|
|
#include "NUM_APPLETS.h"
|
|
#if NUM_APPLETS == 1
|
|
/* STANDALONE does not make sense, and won't compile */
|
|
# undef CONFIG_FEATURE_SH_STANDALONE
|
|
# undef ENABLE_FEATURE_SH_STANDALONE
|
|
# undef IF_FEATURE_SH_STANDALONE
|
|
# undef IF_NOT_FEATURE_SH_STANDALONE
|
|
# define ENABLE_FEATURE_SH_STANDALONE 0
|
|
# define IF_FEATURE_SH_STANDALONE(...)
|
|
# define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
|
|
#endif
|
|
|
|
#ifndef F_DUPFD_CLOEXEC
|
|
# define F_DUPFD_CLOEXEC F_DUPFD
|
|
#endif
|
|
#ifndef O_CLOEXEC
|
|
# define O_CLOEXEC 0
|
|
#endif
|
|
#ifndef PIPE_BUF
|
|
# define PIPE_BUF 4096 /* amount of buffering in a pipe */
|
|
#endif
|
|
|
|
#if !BB_MMU
|
|
# error "Do not even bother, ash will not run on NOMMU machine"
|
|
#endif
|
|
|
|
/* We use a trick to have more optimized code (fewer pointer reloads):
|
|
* ash.c: extern struct globals *const ash_ptr_to_globals;
|
|
* ash_ptr_hack.c: struct globals *ash_ptr_to_globals;
|
|
* This way, compiler in ash.c knows the pointer can not change.
|
|
*
|
|
* However, this may break on weird arches or toolchains. In this case,
|
|
* set "-DBB_GLOBAL_CONST=''" in CONFIG_EXTRA_CFLAGS to disable
|
|
* this optimization.
|
|
*/
|
|
#ifndef BB_GLOBAL_CONST
|
|
# define BB_GLOBAL_CONST const
|
|
#endif
|
|
|
|
|
|
/* ============ Hash table sizes. Configurable. */
|
|
|
|
#define VTABSIZE 39
|
|
#define ATABSIZE 39
|
|
#define CMDTABLESIZE 31 /* should be prime */
|
|
|
|
|
|
/* ============ Shell options */
|
|
|
|
static const char *const optletters_optnames[] = {
|
|
"e" "errexit",
|
|
"f" "noglob",
|
|
"I" "ignoreeof",
|
|
/* The below allowed this invocation:
|
|
* ash -c 'set -i; echo $-; sleep 5; echo $-'
|
|
* to be ^C-ed and get to interactive ash prompt.
|
|
* bash does not support such "set -i".
|
|
* In our code, this is denoted by empty long name:
|
|
*/
|
|
"i" "",
|
|
"m" "monitor",
|
|
"n" "noexec",
|
|
/* Ditto: bash has no "set -s" */
|
|
"s" "",
|
|
"c" "",
|
|
"x" "xtrace",
|
|
"v" "verbose",
|
|
"C" "noclobber",
|
|
"a" "allexport",
|
|
"b" "notify",
|
|
"u" "nounset",
|
|
"\0" "vi"
|
|
#if BASH_PIPEFAIL
|
|
,"\0" "pipefail"
|
|
#endif
|
|
#if DEBUG
|
|
,"\0" "nolog"
|
|
,"\0" "debug"
|
|
#endif
|
|
};
|
|
//bash 4.4.23 also has these opts (with these defaults):
|
|
//braceexpand on
|
|
//emacs on
|
|
//errtrace off
|
|
//functrace off
|
|
//hashall on
|
|
//histexpand off
|
|
//history on
|
|
//interactive-comments on
|
|
//keyword off
|
|
//onecmd off
|
|
//physical off
|
|
//posix off
|
|
//privileged off
|
|
|
|
#define optletters(n) optletters_optnames[n][0]
|
|
#define optnames(n) (optletters_optnames[n] + 1)
|
|
|
|
enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
|
|
|
|
|
|
/* ============ Misc data */
|
|
|
|
#define msg_illnum "Illegal number: %s"
|
|
|
|
/*
|
|
* We enclose jmp_buf in a structure so that we can declare pointers to
|
|
* jump locations. The global variable handler contains the location to
|
|
* jump to when an exception occurs, and the global variable exception_type
|
|
* contains a code identifying the exception. To implement nested
|
|
* exception handlers, the user should save the value of handler on entry
|
|
* to an inner scope, set handler to point to a jmploc structure for the
|
|
* inner scope, and restore handler on exit from the scope.
|
|
*/
|
|
struct jmploc {
|
|
jmp_buf loc;
|
|
};
|
|
|
|
struct globals_misc {
|
|
uint8_t exitstatus; /* exit status of last command */
|
|
uint8_t back_exitstatus;/* exit status of backquoted command */
|
|
smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
|
|
int rootpid; /* pid of main shell */
|
|
/* shell level: 0 for the main shell, 1 for its children, and so on */
|
|
int shlvl;
|
|
#define rootshell (!shlvl)
|
|
int errlinno;
|
|
|
|
char *minusc; /* argument to -c option */
|
|
|
|
char *curdir; // = nullstr; /* current working directory */
|
|
char *physdir; // = nullstr; /* physical working directory */
|
|
|
|
char *arg0; /* value of $0 */
|
|
|
|
struct jmploc *exception_handler;
|
|
|
|
volatile int suppress_int; /* counter */
|
|
volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
|
|
volatile /*sig_atomic_t*/ smallint got_sigchld; /* 1 = got SIGCHLD */
|
|
volatile /*sig_atomic_t*/ smallint pending_sig; /* last pending signal */
|
|
smallint exception_type; /* kind of exception (0..5) */
|
|
/* exceptions */
|
|
#define EXINT 0 /* SIGINT received */
|
|
#define EXERROR 1 /* a generic error */
|
|
#define EXEXIT 4 /* exit the shell */
|
|
|
|
char nullstr[1]; /* zero length string */
|
|
|
|
char optlist[NOPTS];
|
|
#define eflag optlist[0]
|
|
#define fflag optlist[1]
|
|
#define Iflag optlist[2]
|
|
#define iflag optlist[3]
|
|
#define mflag optlist[4]
|
|
#define nflag optlist[5]
|
|
#define sflag optlist[6]
|
|
#define cflag optlist[7]
|
|
#define xflag optlist[8]
|
|
#define vflag optlist[9]
|
|
#define Cflag optlist[10]
|
|
#define aflag optlist[11]
|
|
#define bflag optlist[12]
|
|
#define uflag optlist[13]
|
|
#define viflag optlist[14]
|
|
#if BASH_PIPEFAIL
|
|
# define pipefail optlist[15]
|
|
#else
|
|
# define pipefail 0
|
|
#endif
|
|
#if DEBUG
|
|
# define nolog optlist[15 + BASH_PIPEFAIL]
|
|
# define debug optlist[16 + BASH_PIPEFAIL]
|
|
#endif
|
|
|
|
/* trap handler commands */
|
|
/*
|
|
* Sigmode records the current value of the signal handlers for the various
|
|
* modes. A value of zero means that the current handler is not known.
|
|
* S_HARD_IGN indicates that the signal was ignored on entry to the shell.
|
|
*/
|
|
char sigmode[NSIG - 1];
|
|
#define S_DFL 1 /* default signal handling (SIG_DFL) */
|
|
#define S_CATCH 2 /* signal is caught */
|
|
#define S_IGN 3 /* signal is ignored (SIG_IGN) */
|
|
#define S_HARD_IGN 4 /* signal is ignored permanently (it was SIG_IGN on entry to shell) */
|
|
|
|
/* indicates specified signal received */
|
|
uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
|
|
uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */
|
|
char *trap[NSIG];
|
|
char **trap_ptr; /* used only by "trap hack" */
|
|
|
|
/* Rarely referenced stuff */
|
|
#if ENABLE_ASH_RANDOM_SUPPORT
|
|
random_t random_gen;
|
|
#endif
|
|
pid_t backgndpid; /* pid of last background process */
|
|
};
|
|
extern struct globals_misc *BB_GLOBAL_CONST ash_ptr_to_globals_misc;
|
|
#define G_misc (*ash_ptr_to_globals_misc)
|
|
#define exitstatus (G_misc.exitstatus )
|
|
#define back_exitstatus (G_misc.back_exitstatus )
|
|
#define job_warning (G_misc.job_warning)
|
|
#define rootpid (G_misc.rootpid )
|
|
#define shlvl (G_misc.shlvl )
|
|
#define errlinno (G_misc.errlinno )
|
|
#define minusc (G_misc.minusc )
|
|
#define curdir (G_misc.curdir )
|
|
#define physdir (G_misc.physdir )
|
|
#define arg0 (G_misc.arg0 )
|
|
#define exception_handler (G_misc.exception_handler)
|
|
#define exception_type (G_misc.exception_type )
|
|
#define suppress_int (G_misc.suppress_int )
|
|
#define pending_int (G_misc.pending_int )
|
|
#define got_sigchld (G_misc.got_sigchld )
|
|
#define pending_sig (G_misc.pending_sig )
|
|
#define nullstr (G_misc.nullstr )
|
|
#define optlist (G_misc.optlist )
|
|
#define sigmode (G_misc.sigmode )
|
|
#define gotsig (G_misc.gotsig )
|
|
#define may_have_traps (G_misc.may_have_traps )
|
|
#define trap (G_misc.trap )
|
|
#define trap_ptr (G_misc.trap_ptr )
|
|
#define random_gen (G_misc.random_gen )
|
|
#define backgndpid (G_misc.backgndpid )
|
|
#define INIT_G_misc() do { \
|
|
(*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
|
|
barrier(); \
|
|
curdir = nullstr; \
|
|
physdir = nullstr; \
|
|
trap_ptr = trap; \
|
|
} while (0)
|
|
|
|
|
|
/* ============ DEBUG */
|
|
#if DEBUG
|
|
static void trace_printf(const char *fmt, ...);
|
|
static void trace_vprintf(const char *fmt, va_list va);
|
|
# define TRACE(param) trace_printf param
|
|
# define TRACEV(param) trace_vprintf param
|
|
# define close(fd) do { \
|
|
int dfd = (fd); \
|
|
if (close(dfd) < 0) \
|
|
bb_error_msg("bug on %d: closing %d(0x%x)", \
|
|
__LINE__, dfd, dfd); \
|
|
} while (0)
|
|
#else
|
|
# define TRACE(param)
|
|
# define TRACEV(param)
|
|
#endif
|
|
|
|
|
|
/* ============ Utility functions */
|
|
#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
|
|
#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
|
|
|
|
static int
|
|
isdigit_str9(const char *str)
|
|
{
|
|
int maxlen = 9 + 1; /* max 9 digits: 999999999 */
|
|
while (--maxlen && isdigit(*str))
|
|
str++;
|
|
return (*str == '\0');
|
|
}
|
|
|
|
static const char *
|
|
var_end(const char *var)
|
|
{
|
|
while (*var)
|
|
if (*var++ == '=')
|
|
break;
|
|
return var;
|
|
}
|
|
|
|
|
|
/* ============ Interrupts / exceptions */
|
|
|
|
static void exitshell(void) NORETURN;
|
|
|
|
/*
|
|
* These macros allow the user to suspend the handling of interrupt signals
|
|
* over a period of time. This is similar to SIGHOLD or to sigblock, but
|
|
* much more efficient and portable. (But hacking the kernel is so much
|
|
* more fun than worrying about efficiency and portability. :-))
|
|
*/
|
|
#if DEBUG_INTONOFF
|
|
# define INT_OFF do { \
|
|
TRACE(("%s:%d INT_OFF(%d)\n", __func__, __LINE__, suppress_int)); \
|
|
suppress_int++; \
|
|
barrier(); \
|
|
} while (0)
|
|
#else
|
|
# define INT_OFF do { \
|
|
suppress_int++; \
|
|
barrier(); \
|
|
} while (0)
|
|
#endif
|
|
|
|
/*
|
|
* Called to raise an exception. Since C doesn't include exceptions, we
|
|
* just do a longjmp to the exception handler. The type of exception is
|
|
* stored in the global variable "exception_type".
|
|
*/
|
|
static void raise_exception(int) NORETURN;
|
|
static void
|
|
raise_exception(int e)
|
|
{
|
|
#if DEBUG
|
|
if (exception_handler == NULL)
|
|
abort();
|
|
#endif
|
|
INT_OFF;
|
|
exception_type = e;
|
|
longjmp(exception_handler->loc, 1);
|
|
}
|
|
#if DEBUG
|
|
#define raise_exception(e) do { \
|
|
TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
|
|
raise_exception(e); \
|
|
} while (0)
|
|
#endif
|
|
|
|
/*
|
|
* Called when a SIGINT is received. (If the user specifies
|
|
* that SIGINT is to be trapped or ignored using the trap builtin, then
|
|
* this routine is not called.) Suppressint is nonzero when interrupts
|
|
* are held using the INT_OFF macro. (The test for iflag is just
|
|
* defensive programming.)
|
|
*/
|
|
static void raise_interrupt(void) NORETURN;
|
|
static void
|
|
raise_interrupt(void)
|
|
{
|
|
pending_int = 0;
|
|
/* Signal is not automatically unmasked after it is raised,
|
|
* do it ourself - unmask all signals */
|
|
sigprocmask_allsigs(SIG_UNBLOCK);
|
|
/* pending_sig = 0; - now done in signal_handler() */
|
|
|
|
if (!(rootshell && iflag)) {
|
|
/* Kill ourself with SIGINT */
|
|
signal(SIGINT, SIG_DFL);
|
|
raise(SIGINT);
|
|
}
|
|
/* bash: ^C even on empty command line sets $? */
|
|
exitstatus = SIGINT + 128;
|
|
raise_exception(EXINT);
|
|
/* NOTREACHED */
|
|
}
|
|
#if DEBUG
|
|
#define raise_interrupt() do { \
|
|
TRACE(("raising interrupt on line %d\n", __LINE__)); \
|
|
raise_interrupt(); \
|
|
} while (0)
|
|
#endif
|
|
|
|
static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
|
|
int_on(void)
|
|
{
|
|
barrier();
|
|
if (--suppress_int == 0 && pending_int) {
|
|
raise_interrupt();
|
|
}
|
|
}
|
|
#if DEBUG_INTONOFF
|
|
# define INT_ON do { \
|
|
TRACE(("%s:%d INT_ON(%d)\n", __func__, __LINE__, suppress_int-1)); \
|
|
int_on(); \
|
|
} while (0)
|
|
#else
|
|
# define INT_ON int_on()
|
|
#endif
|
|
static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
|
|
force_int_on(void)
|
|
{
|
|
barrier();
|
|
suppress_int = 0;
|
|
if (pending_int)
|
|
raise_interrupt();
|
|
}
|
|
#define FORCE_INT_ON force_int_on()
|
|
|
|
#define SAVE_INT(v) ((v) = suppress_int)
|
|
|
|
#define RESTORE_INT(v) do { \
|
|
barrier(); \
|
|
suppress_int = (v); \
|
|
if (suppress_int == 0 && pending_int) \
|
|
raise_interrupt(); \
|
|
} while (0)
|
|
|
|
|
|
/* ============ Stdout/stderr output */
|
|
|
|
static void
|
|
outstr(const char *p, FILE *file)
|
|
{
|
|
INT_OFF;
|
|
fputs(p, file);
|
|
INT_ON;
|
|
}
|
|
|
|
static void
|
|
flush_stdout_stderr(void)
|
|
{
|
|
INT_OFF;
|
|
fflush_all();
|
|
INT_ON;
|
|
}
|
|
|
|
/* Was called outcslow(c,FILE*), but c was always '\n' */
|
|
static void
|
|
newline_and_flush(FILE *dest)
|
|
{
|
|
INT_OFF;
|
|
putc('\n', dest);
|
|
fflush(dest);
|
|
INT_ON;
|
|
}
|
|
|
|
static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
|
|
static int
|
|
out1fmt(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int r;
|
|
|
|
INT_OFF;
|
|
va_start(ap, fmt);
|
|
r = vprintf(fmt, ap);
|
|
va_end(ap);
|
|
INT_ON;
|
|
return r;
|
|
}
|
|
|
|
static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
|
|
static int
|
|
fmtstr(char *outbuf, size_t length, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
INT_OFF;
|
|
va_start(ap, fmt);
|
|
ret = vsnprintf(outbuf, length, fmt, ap);
|
|
va_end(ap);
|
|
INT_ON;
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
out1str(const char *p)
|
|
{
|
|
outstr(p, stdout);
|
|
}
|
|
|
|
static void
|
|
out2str(const char *p)
|
|
{
|
|
outstr(p, stderr);
|
|
flush_stdout_stderr();
|
|
}
|
|
|
|
|
|
/* ============ Parser structures */
|
|
|
|
/* control characters in argument strings */
|
|
#define CTL_FIRST CTLESC
|
|
#define CTLESC ((unsigned char)'\201') /* escape next character */
|
|
#define CTLVAR ((unsigned char)'\202') /* variable defn */
|
|
#define CTLENDVAR ((unsigned char)'\203')
|
|
#define CTLBACKQ ((unsigned char)'\204')
|
|
#define CTLARI ((unsigned char)'\206') /* arithmetic expression */
|
|
#define CTLENDARI ((unsigned char)'\207')
|
|
#define CTLQUOTEMARK ((unsigned char)'\210')
|
|
#define CTL_LAST CTLQUOTEMARK
|
|
|
|
/* variable substitution byte (follows CTLVAR) */
|
|
#define VSTYPE 0x0f /* type of variable substitution */
|
|
#define VSNUL 0x10 /* colon--treat the empty string as unset */
|
|
|
|
/* values of VSTYPE field */
|
|
#define VSNORMAL 0x1 /* normal variable: $var or ${var} */
|
|
#define VSMINUS 0x2 /* ${var-text} */
|
|
#define VSPLUS 0x3 /* ${var+text} */
|
|
#define VSQUESTION 0x4 /* ${var?message} */
|
|
#define VSASSIGN 0x5 /* ${var=text} */
|
|
#define VSTRIMRIGHT 0x6 /* ${var%pattern} */
|
|
#define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
|
|
#define VSTRIMLEFT 0x8 /* ${var#pattern} */
|
|
#define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
|
|
#define VSLENGTH 0xa /* ${#var} */
|
|
#if BASH_SUBSTR
|
|
#define VSSUBSTR 0xc /* ${var:position:length} */
|
|
#endif
|
|
#if BASH_PATTERN_SUBST
|
|
#define VSREPLACE 0xd /* ${var/pattern/replacement} */
|
|
#define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
|
|
#endif
|
|
|
|
static const char dolatstr[] ALIGN1 = {
|
|
CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0'
|
|
};
|
|
#define DOLATSTRLEN 6
|
|
|
|
#define NCMD 0
|
|
#define NPIPE 1
|
|
#define NREDIR 2
|
|
#define NBACKGND 3
|
|
#define NSUBSHELL 4
|
|
#define NAND 5
|
|
#define NOR 6
|
|
#define NSEMI 7
|
|
#define NIF 8
|
|
#define NWHILE 9
|
|
#define NUNTIL 10
|
|
#define NFOR 11
|
|
#define NCASE 12
|
|
#define NCLIST 13
|
|
#define NDEFUN 14
|
|
#define NARG 15
|
|
#define NTO 16
|
|
#if BASH_REDIR_OUTPUT
|
|
#define NTO2 17
|
|
#endif
|
|
#define NCLOBBER 18
|
|
#define NFROM 19
|
|
#define NFROMTO 20
|
|
#define NAPPEND 21
|
|
#define NTOFD 22
|
|
#define NFROMFD 23
|
|
#define NHERE 24
|
|
#define NXHERE 25
|
|
#define NNOT 26
|
|
#define N_NUMBER 27
|
|
|
|
union node;
|
|
|
|
struct ncmd {
|
|
smallint type; /* Nxxxx */
|
|
int linno;
|
|
union node *assign;
|
|
union node *args;
|
|
union node *redirect;
|
|
};
|
|
|
|
struct npipe {
|
|
smallint type;
|
|
smallint pipe_backgnd;
|
|
struct nodelist *cmdlist;
|
|
};
|
|
|
|
struct nredir {
|
|
smallint type;
|
|
int linno;
|
|
union node *n;
|
|
union node *redirect;
|
|
};
|
|
|
|
struct nbinary {
|
|
smallint type;
|
|
union node *ch1;
|
|
union node *ch2;
|
|
};
|
|
|
|
struct nif {
|
|
smallint type;
|
|
union node *test;
|
|
union node *ifpart;
|
|
union node *elsepart;
|
|
};
|
|
|
|
struct nfor {
|
|
smallint type;
|
|
int linno;
|
|
union node *args;
|
|
union node *body;
|
|
char *var;
|
|
};
|
|
|
|
struct ncase {
|
|
smallint type;
|
|
int linno;
|
|
union node *expr;
|
|
union node *cases;
|
|
};
|
|
|
|
struct nclist {
|
|
smallint type;
|
|
union node *next;
|
|
union node *pattern;
|
|
union node *body;
|
|
};
|
|
|
|
struct ndefun {
|
|
smallint type;
|
|
int linno;
|
|
char *text;
|
|
union node *body;
|
|
};
|
|
|
|
struct narg {
|
|
smallint type;
|
|
union node *next;
|
|
char *text;
|
|
struct nodelist *backquote;
|
|
};
|
|
|
|
/* nfile and ndup layout must match!
|
|
* NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
|
|
* that it is actually NTO2 (>&file), and change its type.
|
|
*/
|
|
struct nfile {
|
|
smallint type;
|
|
union node *next;
|
|
int fd;
|
|
int _unused_dupfd;
|
|
union node *fname;
|
|
char *expfname;
|
|
};
|
|
|
|
struct ndup {
|
|
smallint type;
|
|
union node *next;
|
|
int fd;
|
|
int dupfd;
|
|
union node *vname;
|
|
char *_unused_expfname;
|
|
};
|
|
|
|
struct nhere {
|
|
smallint type;
|
|
union node *next;
|
|
int fd;
|
|
union node *doc;
|
|
};
|
|
|
|
struct nnot {
|
|
smallint type;
|
|
union node *com;
|
|
};
|
|
|
|
union node {
|
|
smallint type;
|
|
struct ncmd ncmd;
|
|
struct npipe npipe;
|
|
struct nredir nredir;
|
|
struct nbinary nbinary;
|
|
struct nif nif;
|
|
struct nfor nfor;
|
|
struct ncase ncase;
|
|
struct nclist nclist;
|
|
struct ndefun ndefun;
|
|
struct narg narg;
|
|
struct nfile nfile;
|
|
struct ndup ndup;
|
|
struct nhere nhere;
|
|
struct nnot nnot;
|
|
};
|
|
|
|
/*
|
|
* NODE_EOF is returned by parsecmd when it encounters an end of file.
|
|
* It must be distinct from NULL.
|
|
*/
|
|
#define NODE_EOF ((union node *) -1L)
|
|
|
|
struct nodelist {
|
|
struct nodelist *next;
|
|
union node *n;
|
|
};
|
|
|
|
struct funcnode {
|
|
int count;
|
|
union node n;
|
|
};
|
|
|
|
/*
|
|
* Free a parse tree.
|
|
*/
|
|
static void
|
|
freefunc(struct funcnode *f)
|
|
{
|
|
if (f && --f->count < 0)
|
|
free(f);
|
|
}
|
|
|
|
|
|
/* ============ Debugging output */
|
|
|
|
#if DEBUG
|
|
|
|
static FILE *tracefile;
|
|
|
|
static void
|
|
trace_printf(const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
if (debug != 1)
|
|
return;
|
|
if (DEBUG_TIME)
|
|
fprintf(tracefile, "%u ", (int) time(NULL));
|
|
if (DEBUG_PID)
|
|
fprintf(tracefile, "[%u] ", (int) getpid());
|
|
if (DEBUG_SIG)
|
|
fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
|
|
va_start(va, fmt);
|
|
vfprintf(tracefile, fmt, va);
|
|
va_end(va);
|
|
}
|
|
|
|
static void
|
|
trace_vprintf(const char *fmt, va_list va)
|
|
{
|
|
if (debug != 1)
|
|
return;
|
|
vfprintf(tracefile, fmt, va);
|
|
fprintf(tracefile, "\n");
|
|
}
|
|
|
|
static void
|
|
trace_puts(const char *s)
|
|
{
|
|
if (debug != 1)
|
|
return;
|
|
fputs(s, tracefile);
|
|
}
|
|
|
|
static void
|
|
trace_puts_quoted(char *s)
|
|
{
|
|
char *p;
|
|
char c;
|
|
|
|
if (debug != 1)
|
|
return;
|
|
putc('"', tracefile);
|
|
for (p = s; *p; p++) {
|
|
switch ((unsigned char)*p) {
|
|
case '\n': c = 'n'; goto backslash;
|
|
case '\t': c = 't'; goto backslash;
|
|
case '\r': c = 'r'; goto backslash;
|
|
case '\"': c = '\"'; goto backslash;
|
|
case '\\': c = '\\'; goto backslash;
|
|
case CTLESC: c = 'e'; goto backslash;
|
|
case CTLVAR: c = 'v'; goto backslash;
|
|
case CTLBACKQ: c = 'q'; goto backslash;
|
|
backslash:
|
|
putc('\\', tracefile);
|
|
putc(c, tracefile);
|
|
break;
|
|
default:
|
|
if (*p >= ' ' && *p <= '~')
|
|
putc(*p, tracefile);
|
|
else {
|
|
putc('\\', tracefile);
|
|
putc((*p >> 6) & 03, tracefile);
|
|
putc((*p >> 3) & 07, tracefile);
|
|
putc(*p & 07, tracefile);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
putc('"', tracefile);
|
|
}
|
|
|
|
static void
|
|
trace_puts_args(char **ap)
|
|
{
|
|
if (debug != 1)
|
|
return;
|
|
if (!*ap)
|
|
return;
|
|
while (1) {
|
|
trace_puts_quoted(*ap);
|
|
if (!*++ap) {
|
|
putc('\n', tracefile);
|
|
break;
|
|
}
|
|
putc(' ', tracefile);
|
|
}
|
|
}
|
|
|
|
static void
|
|
opentrace(void)
|
|
{
|
|
char s[100];
|
|
#ifdef O_APPEND
|
|
int flags;
|
|
#endif
|
|
|
|
if (debug != 1) {
|
|
if (tracefile)
|
|
fflush(tracefile);
|
|
/* leave open because libedit might be using it */
|
|
return;
|
|
}
|
|
strcpy(s, "./trace");
|
|
if (tracefile) {
|
|
if (!freopen(s, "a", tracefile)) {
|
|
fprintf(stderr, "Can't re-open %s\n", s);
|
|
debug = 0;
|
|
return;
|
|
}
|
|
} else {
|
|
tracefile = fopen(s, "a");
|
|
if (tracefile == NULL) {
|
|
fprintf(stderr, "Can't open %s\n", s);
|
|
debug = 0;
|
|
return;
|
|
}
|
|
}
|
|
#ifdef O_APPEND
|
|
flags = fcntl(fileno(tracefile), F_GETFL);
|
|
if (flags >= 0)
|
|
fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
|
|
#endif
|
|
setlinebuf(tracefile);
|
|
fputs("\nTracing started.\n", tracefile);
|
|
}
|
|
|
|
static void
|
|
indent(int amount, char *pfx, FILE *fp)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < amount; i++) {
|
|
if (pfx && i == amount - 1)
|
|
fputs(pfx, fp);
|
|
putc('\t', fp);
|
|
}
|
|
}
|
|
|
|
/* little circular references here... */
|
|
static void shtree(union node *n, int ind, char *pfx, FILE *fp);
|
|
|
|
static void
|
|
sharg(union node *arg, FILE *fp)
|
|
{
|
|
char *p;
|
|
struct nodelist *bqlist;
|
|
unsigned char subtype;
|
|
|
|
if (arg->type != NARG) {
|
|
out1fmt("<node type %d>\n", arg->type);
|
|
abort();
|
|
}
|
|
bqlist = arg->narg.backquote;
|
|
for (p = arg->narg.text; *p; p++) {
|
|
switch ((unsigned char)*p) {
|
|
case CTLESC:
|
|
p++;
|
|
putc(*p, fp);
|
|
break;
|
|
case CTLVAR:
|
|
putc('$', fp);
|
|
putc('{', fp);
|
|
subtype = *++p;
|
|
if (subtype == VSLENGTH)
|
|
putc('#', fp);
|
|
|
|
while (*p != '=') {
|
|
putc(*p, fp);
|
|
p++;
|
|
}
|
|
|
|
if (subtype & VSNUL)
|
|
putc(':', fp);
|
|
|
|
switch (subtype & VSTYPE) {
|
|
case VSNORMAL:
|
|
putc('}', fp);
|
|
break;
|
|
case VSMINUS:
|
|
putc('-', fp);
|
|
break;
|
|
case VSPLUS:
|
|
putc('+', fp);
|
|
break;
|
|
case VSQUESTION:
|
|
putc('?', fp);
|
|
break;
|
|
case VSASSIGN:
|
|
putc('=', fp);
|
|
break;
|
|
case VSTRIMLEFT:
|
|
putc('#', fp);
|
|
break;
|
|
case VSTRIMLEFTMAX:
|
|
putc('#', fp);
|
|
putc('#', fp);
|
|
break;
|
|
case VSTRIMRIGHT:
|
|
putc('%', fp);
|
|
break;
|
|
case VSTRIMRIGHTMAX:
|
|
putc('%', fp);
|
|
putc('%', fp);
|
|
break;
|
|
case VSLENGTH:
|
|
break;
|
|
default:
|
|
out1fmt("<subtype %d>", subtype);
|
|
}
|
|
break;
|
|
case CTLENDVAR:
|
|
putc('}', fp);
|
|
break;
|
|
case CTLBACKQ:
|
|
putc('$', fp);
|
|
putc('(', fp);
|
|
shtree(bqlist->n, -1, NULL, fp);
|
|
putc(')', fp);
|
|
break;
|
|
default:
|
|
putc(*p, fp);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
shcmd(union node *cmd, FILE *fp)
|
|
{
|
|
union node *np;
|
|
int first;
|
|
const char *s;
|
|
int dftfd;
|
|
|
|
first = 1;
|
|
for (np = cmd->ncmd.args; np; np = np->narg.next) {
|
|
if (!first)
|
|
putc(' ', fp);
|
|
sharg(np, fp);
|
|
first = 0;
|
|
}
|
|
for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
|
|
if (!first)
|
|
putc(' ', fp);
|
|
dftfd = 0;
|
|
switch (np->nfile.type) {
|
|
case NTO: s = ">>"+1; dftfd = 1; break;
|
|
case NCLOBBER: s = ">|"; dftfd = 1; break;
|
|
case NAPPEND: s = ">>"; dftfd = 1; break;
|
|
#if BASH_REDIR_OUTPUT
|
|
case NTO2:
|
|
#endif
|
|
case NTOFD: s = ">&"; dftfd = 1; break;
|
|
case NFROM: s = "<"; break;
|
|
case NFROMFD: s = "<&"; break;
|
|
case NFROMTO: s = "<>"; break;
|
|
default: s = "*error*"; break;
|
|
}
|
|
if (np->nfile.fd != dftfd)
|
|
fprintf(fp, "%d", np->nfile.fd);
|
|
fputs(s, fp);
|
|
if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
|
|
fprintf(fp, "%d", np->ndup.dupfd);
|
|
} else {
|
|
sharg(np->nfile.fname, fp);
|
|
}
|
|
first = 0;
|
|
}
|
|
}
|
|
|
|
static void
|
|
shtree(union node *n, int ind, char *pfx, FILE *fp)
|
|
{
|
|
struct nodelist *lp;
|
|
const char *s;
|
|
|
|
if (n == NULL)
|
|
return;
|
|
|
|
indent(ind, pfx, fp);
|
|
|
|
if (n == NODE_EOF) {
|
|
fputs("<EOF>", fp);
|
|
return;
|
|
}
|
|
|
|
switch (n->type) {
|
|
case NSEMI:
|
|
s = "; ";
|
|
goto binop;
|
|
case NAND:
|
|
s = " && ";
|
|
goto binop;
|
|
case NOR:
|
|
s = " || ";
|
|
binop:
|
|
shtree(n->nbinary.ch1, ind, NULL, fp);
|
|
/* if (ind < 0) */
|
|
fputs(s, fp);
|
|
shtree(n->nbinary.ch2, ind, NULL, fp);
|
|
break;
|
|
case NCMD:
|
|
shcmd(n, fp);
|
|
if (ind >= 0)
|
|
putc('\n', fp);
|
|
break;
|
|
case NPIPE:
|
|
for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
|
|
shtree(lp->n, 0, NULL, fp);
|
|
if (lp->next)
|
|
fputs(" | ", fp);
|
|
}
|
|
if (n->npipe.pipe_backgnd)
|
|
fputs(" &", fp);
|
|
if (ind >= 0)
|
|
putc('\n', fp);
|
|
break;
|
|
default:
|
|
fprintf(fp, "<node type %d>", n->type);
|
|
if (ind >= 0)
|
|
putc('\n', fp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
showtree(union node *n)
|
|
{
|
|
trace_puts("showtree called\n");
|
|
shtree(n, 1, NULL, stderr);
|
|
}
|
|
|
|
#endif /* DEBUG */
|
|
|
|
|
|
/* ============ Parser data */
|
|
|
|
/*
|
|
* ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
|
|
*/
|
|
struct strlist {
|
|
struct strlist *next;
|
|
char *text;
|
|
};
|
|
|
|
struct alias;
|
|
|
|
struct strpush {
|
|
struct strpush *prev; /* preceding string on stack */
|
|
char *prev_string;
|
|
int prev_left_in_line;
|
|
#if ENABLE_ASH_ALIAS
|
|
struct alias *ap; /* if push was associated with an alias */
|
|
#endif
|
|
char *string; /* remember the string since it may change */
|
|
|
|
/* Remember last two characters for pungetc. */
|
|
int lastc[2];
|
|
|
|
/* Number of outstanding calls to pungetc. */
|
|
int unget;
|
|
};
|
|
|
|
/*
|
|
* The parsefile structure pointed to by the global variable parsefile
|
|
* contains information about the current file being read.
|
|
*/
|
|
struct parsefile {
|
|
struct parsefile *prev; /* preceding file on stack */
|
|
int linno; /* current line */
|
|
int pf_fd; /* file descriptor (or -1 if string) */
|
|
int left_in_line; /* number of chars left in this line */
|
|
int left_in_buffer; /* number of chars left in this buffer past the line */
|
|
char *next_to_pgetc; /* next char in buffer */
|
|
char *buf; /* input buffer */
|
|
struct strpush *strpush; /* for pushing strings at this level */
|
|
struct strpush basestrpush; /* so pushing one is fast */
|
|
|
|
/* Remember last two characters for pungetc. */
|
|
int lastc[2];
|
|
|
|
/* Number of outstanding calls to pungetc. */
|
|
int unget;
|
|
};
|
|
|
|
static struct parsefile basepf; /* top level input file */
|
|
static struct parsefile *g_parsefile = &basepf; /* current input file */
|
|
static char *commandname; /* currently executing command */
|
|
|
|
|
|
/* ============ Message printing */
|
|
|
|
static void
|
|
ash_vmsg(const char *msg, va_list ap)
|
|
{
|
|
fprintf(stderr, "%s: ", arg0);
|
|
if (commandname) {
|
|
if (strcmp(arg0, commandname))
|
|
fprintf(stderr, "%s: ", commandname);
|
|
if (!iflag || g_parsefile->pf_fd > 0)
|
|
fprintf(stderr, "line %d: ", errlinno);
|
|
}
|
|
vfprintf(stderr, msg, ap);
|
|
newline_and_flush(stderr);
|
|
}
|
|
|
|
/*
|
|
* Exverror is called to raise the error exception. If the second argument
|
|
* is not NULL then error prints an error message using printf style
|
|
* formatting. It then raises the error exception.
|
|
*/
|
|
static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
|
|
static void
|
|
ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
|
|
{
|
|
#if DEBUG
|
|
if (msg) {
|
|
TRACE(("ash_vmsg_and_raise(%d):", cond));
|
|
TRACEV((msg, ap));
|
|
} else
|
|
TRACE(("ash_vmsg_and_raise(%d):NULL\n", cond));
|
|
if (msg)
|
|
#endif
|
|
ash_vmsg(msg, ap);
|
|
|
|
flush_stdout_stderr();
|
|
raise_exception(cond);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void ash_msg_and_raise_error(const char *, ...) NORETURN;
|
|
static void
|
|
ash_msg_and_raise_error(const char *msg, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
exitstatus = 2;
|
|
|
|
va_start(ap, msg);
|
|
ash_vmsg_and_raise(EXERROR, msg, ap);
|
|
/* NOTREACHED */
|
|
va_end(ap);
|
|
}
|
|
|
|
/*
|
|
* 'fmt' must be a string literal.
|
|
*/
|
|
#define ash_msg_and_raise_perror(fmt, ...) ash_msg_and_raise_error(fmt ": "STRERROR_FMT, ##__VA_ARGS__ STRERROR_ERRNO)
|
|
|
|
static void raise_error_syntax(const char *) NORETURN;
|
|
static void
|
|
raise_error_syntax(const char *msg)
|
|
{
|
|
errlinno = g_parsefile->linno;
|
|
ash_msg_and_raise_error("syntax error: %s", msg);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void ash_msg_and_raise(int, const char *, ...) NORETURN;
|
|
static void
|
|
ash_msg_and_raise(int cond, const char *msg, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, msg);
|
|
ash_vmsg_and_raise(cond, msg, ap);
|
|
/* NOTREACHED */
|
|
va_end(ap);
|
|
}
|
|
|
|
/*
|
|
* error/warning routines for external builtins
|
|
*/
|
|
static void
|
|
ash_msg(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
ash_vmsg(fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
|
|
/*
|
|
* Return a string describing an error. The returned string may be a
|
|
* pointer to a static buffer that will be overwritten on the next call.
|
|
* Action describes the operation that got the error.
|
|
*/
|
|
static const char *
|
|
errmsg(int e, const char *em)
|
|
{
|
|
if (e == ENOENT || e == ENOTDIR) {
|
|
return em;
|
|
}
|
|
return strerror(e);
|
|
}
|
|
|
|
|
|
/* ============ Memory allocation */
|
|
|
|
#if 0
|
|
/* I consider these wrappers nearly useless:
|
|
* ok, they return you to nearest exception handler, but
|
|
* how much memory do you leak in the process, making
|
|
* memory starvation worse?
|
|
*/
|
|
static void *
|
|
ckrealloc(void * p, size_t nbytes)
|
|
{
|
|
p = realloc(p, nbytes);
|
|
if (!p)
|
|
ash_msg_and_raise_error(bb_msg_memory_exhausted);
|
|
return p;
|
|
}
|
|
|
|
static void *
|
|
ckmalloc(size_t nbytes)
|
|
{
|
|
return ckrealloc(NULL, nbytes);
|
|
}
|
|
|
|
static void *
|
|
ckzalloc(size_t nbytes)
|
|
{
|
|
return memset(ckmalloc(nbytes), 0, nbytes);
|
|
}
|
|
|
|
static char *
|
|
ckstrdup(const char *s)
|
|
{
|
|
char *p = strdup(s);
|
|
if (!p)
|
|
ash_msg_and_raise_error(bb_msg_memory_exhausted);
|
|
return p;
|
|
}
|
|
#else
|
|
/* Using bbox equivalents. They exit if out of memory */
|
|
# define ckrealloc xrealloc
|
|
# define ckmalloc xmalloc
|
|
# define ckzalloc xzalloc
|
|
# define ckstrdup xstrdup
|
|
#endif
|
|
|
|
/*
|
|
* It appears that grabstackstr() will barf with such alignments
|
|
* because stalloc() will return a string allocated in a new stackblock.
|
|
*/
|
|
#define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
|
|
enum {
|
|
/* Most machines require the value returned from malloc to be aligned
|
|
* in some way. The following macro will get this right
|
|
* on many machines. */
|
|
SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1,
|
|
/* Minimum size of a block */
|
|
MINSIZE = SHELL_ALIGN(504),
|
|
};
|
|
|
|
struct stack_block {
|
|
struct stack_block *prev;
|
|
char space[MINSIZE];
|
|
};
|
|
|
|
struct stackmark {
|
|
struct stack_block *stackp;
|
|
char *stacknxt;
|
|
size_t stacknleft;
|
|
};
|
|
|
|
|
|
struct globals_memstack {
|
|
struct stack_block *g_stackp; // = &stackbase;
|
|
char *g_stacknxt; // = stackbase.space;
|
|
char *sstrend; // = stackbase.space + MINSIZE;
|
|
size_t g_stacknleft; // = MINSIZE;
|
|
struct stack_block stackbase;
|
|
};
|
|
extern struct globals_memstack *BB_GLOBAL_CONST ash_ptr_to_globals_memstack;
|
|
#define G_memstack (*ash_ptr_to_globals_memstack)
|
|
#define g_stackp (G_memstack.g_stackp )
|
|
#define g_stacknxt (G_memstack.g_stacknxt )
|
|
#define sstrend (G_memstack.sstrend )
|
|
#define g_stacknleft (G_memstack.g_stacknleft)
|
|
#define stackbase (G_memstack.stackbase )
|
|
#define INIT_G_memstack() do { \
|
|
(*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
|
|
barrier(); \
|
|
g_stackp = &stackbase; \
|
|
g_stacknxt = stackbase.space; \
|
|
g_stacknleft = MINSIZE; \
|
|
sstrend = stackbase.space + MINSIZE; \
|
|
} while (0)
|
|
|
|
|
|
#define stackblock() ((void *)g_stacknxt)
|
|
#define stackblocksize() g_stacknleft
|
|
|
|
/*
|
|
* Parse trees for commands are allocated in lifo order, so we use a stack
|
|
* to make this more efficient, and also to avoid all sorts of exception
|
|
* handling code to handle interrupts in the middle of a parse.
|
|
*
|
|
* The size 504 was chosen because the Ultrix malloc handles that size
|
|
* well.
|
|
*/
|
|
static void *
|
|
stalloc(size_t nbytes)
|
|
{
|
|
char *p;
|
|
size_t aligned;
|
|
|
|
aligned = SHELL_ALIGN(nbytes);
|
|
if (aligned > g_stacknleft) {
|
|
size_t len;
|
|
size_t blocksize;
|
|
struct stack_block *sp;
|
|
|
|
blocksize = aligned;
|
|
if (blocksize < MINSIZE)
|
|
blocksize = MINSIZE;
|
|
len = sizeof(struct stack_block) - MINSIZE + blocksize;
|
|
if (len < blocksize)
|
|
ash_msg_and_raise_error(bb_msg_memory_exhausted);
|
|
INT_OFF;
|
|
sp = ckmalloc(len);
|
|
sp->prev = g_stackp;
|
|
g_stacknxt = sp->space;
|
|
g_stacknleft = blocksize;
|
|
sstrend = g_stacknxt + blocksize;
|
|
g_stackp = sp;
|
|
INT_ON;
|
|
}
|
|
p = g_stacknxt;
|
|
g_stacknxt += aligned;
|
|
g_stacknleft -= aligned;
|
|
return p;
|
|
}
|
|
|
|
static void *
|
|
stzalloc(size_t nbytes)
|
|
{
|
|
return memset(stalloc(nbytes), 0, nbytes);
|
|
}
|
|
|
|
static void
|
|
stunalloc(void *p)
|
|
{
|
|
#if DEBUG
|
|
if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
|
|
write(STDERR_FILENO, "stunalloc\n", 10);
|
|
abort();
|
|
}
|
|
#endif
|
|
g_stacknleft += g_stacknxt - (char *)p;
|
|
g_stacknxt = p;
|
|
}
|
|
|
|
/*
|
|
* Like strdup but works with the ash stack.
|
|
*/
|
|
static char *
|
|
sstrdup(const char *p)
|
|
{
|
|
size_t len = strlen(p) + 1;
|
|
return memcpy(stalloc(len), p, len);
|
|
}
|
|
|
|
static ALWAYS_INLINE void
|
|
grabstackblock(size_t len)
|
|
{
|
|
stalloc(len);
|
|
}
|
|
|
|
static void
|
|
pushstackmark(struct stackmark *mark, size_t len)
|
|
{
|
|
mark->stackp = g_stackp;
|
|
mark->stacknxt = g_stacknxt;
|
|
mark->stacknleft = g_stacknleft;
|
|
grabstackblock(len);
|
|
}
|
|
|
|
static void
|
|
setstackmark(struct stackmark *mark)
|
|
{
|
|
pushstackmark(mark, g_stacknxt == g_stackp->space && g_stackp != &stackbase);
|
|
}
|
|
|
|
static void
|
|
popstackmark(struct stackmark *mark)
|
|
{
|
|
struct stack_block *sp;
|
|
|
|
if (!mark->stackp)
|
|
return;
|
|
|
|
INT_OFF;
|
|
while (g_stackp != mark->stackp) {
|
|
sp = g_stackp;
|
|
g_stackp = sp->prev;
|
|
free(sp);
|
|
}
|
|
g_stacknxt = mark->stacknxt;
|
|
g_stacknleft = mark->stacknleft;
|
|
sstrend = mark->stacknxt + mark->stacknleft;
|
|
INT_ON;
|
|
}
|
|
|
|
/*
|
|
* When the parser reads in a string, it wants to stick the string on the
|
|
* stack and only adjust the stack pointer when it knows how big the
|
|
* string is. Stackblock (defined in stack.h) returns a pointer to a block
|
|
* of space on top of the stack and stackblocklen returns the length of
|
|
* this block. Growstackblock will grow this space by at least one byte,
|
|
* possibly moving it (like realloc). Grabstackblock actually allocates the
|
|
* part of the block that has been used.
|
|
*/
|
|
static void
|
|
growstackblock(void)
|
|
{
|
|
size_t newlen;
|
|
|
|
newlen = g_stacknleft * 2;
|
|
if (newlen < g_stacknleft)
|
|
ash_msg_and_raise_error(bb_msg_memory_exhausted);
|
|
if (newlen < 128)
|
|
newlen += 128;
|
|
|
|
if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
|
|
struct stack_block *sp;
|
|
struct stack_block *prevstackp;
|
|
size_t grosslen;
|
|
|
|
INT_OFF;
|
|
sp = g_stackp;
|
|
prevstackp = sp->prev;
|
|
grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
|
|
sp = ckrealloc(sp, grosslen);
|
|
sp->prev = prevstackp;
|
|
g_stackp = sp;
|
|
g_stacknxt = sp->space;
|
|
g_stacknleft = newlen;
|
|
sstrend = sp->space + newlen;
|
|
INT_ON;
|
|
} else {
|
|
char *oldspace = g_stacknxt;
|
|
size_t oldlen = g_stacknleft;
|
|
char *p = stalloc(newlen);
|
|
|
|
/* free the space we just allocated */
|
|
g_stacknxt = memcpy(p, oldspace, oldlen);
|
|
g_stacknleft += newlen;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The following routines are somewhat easier to use than the above.
|
|
* The user declares a variable of type STACKSTR, which may be declared
|
|
* to be a register. The macro STARTSTACKSTR initializes things. Then
|
|
* the user uses the macro STPUTC to add characters to the string. In
|
|
* effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
|
|
* grown as necessary. When the user is done, she can just leave the
|
|
* string there and refer to it using stackblock(). Or she can allocate
|
|
* the space for it using grabstackstr(). If it is necessary to allow
|
|
* someone else to use the stack temporarily and then continue to grow
|
|
* the string, the user should use grabstack to allocate the space, and
|
|
* then call ungrabstr(p) to return to the previous mode of operation.
|
|
*
|
|
* USTPUTC is like STPUTC except that it doesn't check for overflow.
|
|
* CHECKSTACKSPACE can be called before USTPUTC to ensure that there
|
|
* is space for at least one character.
|
|
*/
|
|
static void *
|
|
growstackstr(void)
|
|
{
|
|
size_t len = stackblocksize();
|
|
growstackblock();
|
|
return (char *)stackblock() + len;
|
|
}
|
|
|
|
/*
|
|
* Called from CHECKSTRSPACE.
|
|
*/
|
|
static char *
|
|
makestrspace(size_t newlen, char *p)
|
|
{
|
|
size_t len = p - g_stacknxt;
|
|
size_t size;
|
|
|
|
for (;;) {
|
|
size_t nleft;
|
|
|
|
size = stackblocksize();
|
|
nleft = size - len;
|
|
if (nleft >= newlen)
|
|
break;
|
|
growstackblock();
|
|
}
|
|
return (char *)stackblock() + len;
|
|
}
|
|
|
|
static char *
|
|
stack_nputstr(const char *s, size_t n, char *p)
|
|
{
|
|
p = makestrspace(n, p);
|
|
p = (char *)mempcpy(p, s, n);
|
|
return p;
|
|
}
|
|
|
|
static char *
|
|
stack_putstr(const char *s, char *p)
|
|
{
|
|
return stack_nputstr(s, strlen(s), p);
|
|
}
|
|
|
|
static char *
|
|
_STPUTC(int c, char *p)
|
|
{
|
|
if (p == sstrend)
|
|
p = growstackstr();
|
|
*p++ = c;
|
|
return p;
|
|
}
|
|
|
|
#define STARTSTACKSTR(p) ((p) = stackblock())
|
|
#define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
|
|
#define CHECKSTRSPACE(n, p) do { \
|
|
char *q = (p); \
|
|
size_t l = (n); \
|
|
size_t m = sstrend - q; \
|
|
if (l > m) \
|
|
(p) = makestrspace(l, q); \
|
|
} while (0)
|
|
#define USTPUTC(c, p) (*(p)++ = (c))
|
|
#define STACKSTRNUL(p) do { \
|
|
if ((p) == sstrend) \
|
|
(p) = growstackstr(); \
|
|
*(p) = '\0'; \
|
|
} while (0)
|
|
#define STUNPUTC(p) (--(p))
|
|
#define STTOPC(p) ((p)[-1])
|
|
#define STADJUST(amount, p) ((p) += (amount))
|
|
|
|
#define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
|
|
#define ungrabstackstr(s, p) stunalloc(s)
|
|
#define stackstrend() ((void *)sstrend)
|
|
|
|
|
|
/* ============ String helpers */
|
|
|
|
/*
|
|
* prefix -- see if pfx is a prefix of string.
|
|
*/
|
|
static char *
|
|
prefix(const char *string, const char *pfx)
|
|
{
|
|
while (*pfx) {
|
|
if (*pfx++ != *string++)
|
|
return NULL;
|
|
}
|
|
return (char *) string;
|
|
}
|
|
|
|
/*
|
|
* Check for a valid number. This should be elsewhere.
|
|
*/
|
|
static int
|
|
is_number(const char *p)
|
|
{
|
|
do {
|
|
if (!isdigit(*p))
|
|
return 0;
|
|
} while (*++p != '\0');
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Convert a string of digits to an integer, printing an error message on
|
|
* failure.
|
|
*/
|
|
static int
|
|
number(const char *s)
|
|
{
|
|
if (!is_number(s))
|
|
ash_msg_and_raise_error(msg_illnum, s);
|
|
return atoi(s);
|
|
}
|
|
|
|
/*
|
|
* Produce a single quoted string suitable as input to the shell.
|
|
* The return string is allocated on the stack.
|
|
*/
|
|
static char *
|
|
single_quote(const char *s)
|
|
{
|
|
char *p;
|
|
|
|
STARTSTACKSTR(p);
|
|
|
|
do {
|
|
char *q;
|
|
size_t len;
|
|
|
|
len = strchrnul(s, '\'') - s;
|
|
|
|
q = p = makestrspace(len + 3, p);
|
|
|
|
*q++ = '\'';
|
|
q = (char *)mempcpy(q, s, len);
|
|
*q++ = '\'';
|
|
s += len;
|
|
|
|
STADJUST(q - p, p);
|
|
|
|
if (*s != '\'')
|
|
break;
|
|
len = 0;
|
|
do len++; while (*++s == '\'');
|
|
|
|
q = p = makestrspace(len + 3, p);
|
|
|
|
*q++ = '"';
|
|
q = (char *)mempcpy(q, s - len, len);
|
|
*q++ = '"';
|
|
|
|
STADJUST(q - p, p);
|
|
} while (*s);
|
|
|
|
USTPUTC('\0', p);
|
|
|
|
return stackblock();
|
|
}
|
|
|
|
/*
|
|
* Produce a possibly single quoted string suitable as input to the shell.
|
|
* If quoting was done, the return string is allocated on the stack,
|
|
* otherwise a pointer to the original string is returned.
|
|
*/
|
|
static const char *
|
|
maybe_single_quote(const char *s)
|
|
{
|
|
const char *p = s;
|
|
|
|
while (*p) {
|
|
/* Assuming ACSII */
|
|
/* quote ctrl_chars space !"#$%&'()* */
|
|
if (*p < '+')
|
|
goto need_quoting;
|
|
/* quote ;<=>? */
|
|
if (*p >= ';' && *p <= '?')
|
|
goto need_quoting;
|
|
/* quote `[\ */
|
|
if (*p == '`')
|
|
goto need_quoting;
|
|
if (*p == '[')
|
|
goto need_quoting;
|
|
if (*p == '\\')
|
|
goto need_quoting;
|
|
/* quote {|}~ DEL and high bytes */
|
|
if (*p > 'z')
|
|
goto need_quoting;
|
|
/* Not quoting these: +,-./ 0-9 :@ A-Z ]^_ a-z */
|
|
/* TODO: maybe avoid quoting % */
|
|
p++;
|
|
}
|
|
return s;
|
|
|
|
need_quoting:
|
|
return single_quote(s);
|
|
}
|
|
|
|
|
|
/* ============ nextopt */
|
|
|
|
static char **argptr; /* argument list for builtin commands */
|
|
static char *optionarg; /* set by nextopt (like getopt) */
|
|
static char *optptr; /* used by nextopt */
|
|
|
|
/*
|
|
* XXX - should get rid of. Have all builtins use getopt(3).
|
|
* The library getopt must have the BSD extension static variable
|
|
* "optreset", otherwise it can't be used within the shell safely.
|
|
*
|
|
* Standard option processing (a la getopt) for builtin routines.
|
|
* The only argument that is passed to nextopt is the option string;
|
|
* the other arguments are unnecessary. It returns the character,
|
|
* or '\0' on end of input.
|
|
*/
|
|
static int
|
|
nextopt(const char *optstring)
|
|
{
|
|
char *p;
|
|
const char *q;
|
|
char c;
|
|
|
|
p = optptr;
|
|
if (p == NULL || *p == '\0') {
|
|
/* We ate entire "-param", take next one */
|
|
p = *argptr;
|
|
if (p == NULL)
|
|
return '\0';
|
|
if (*p != '-')
|
|
return '\0';
|
|
if (*++p == '\0') /* just "-" ? */
|
|
return '\0';
|
|
argptr++;
|
|
if (LONE_DASH(p)) /* "--" ? */
|
|
return '\0';
|
|
/* p => next "-param" */
|
|
}
|
|
/* p => some option char in the middle of a "-param" */
|
|
c = *p++;
|
|
for (q = optstring; *q != c;) {
|
|
if (*q == '\0')
|
|
ash_msg_and_raise_error("illegal option -%c", c);
|
|
if (*++q == ':')
|
|
q++;
|
|
}
|
|
if (*++q == ':') {
|
|
if (*p == '\0') {
|
|
p = *argptr++;
|
|
if (p == NULL)
|
|
ash_msg_and_raise_error("no arg for -%c option", c);
|
|
}
|
|
optionarg = p;
|
|
p = NULL;
|
|
}
|
|
optptr = p;
|
|
return c;
|
|
}
|
|
|
|
|
|
/* ============ Shell variables */
|
|
|
|
struct shparam {
|
|
int nparam; /* # of positional parameters (without $0) */
|
|
#if ENABLE_ASH_GETOPTS
|
|
int optind; /* next parameter to be processed by getopts */
|
|
int optoff; /* used by getopts */
|
|
#endif
|
|
unsigned char malloced; /* if parameter list dynamically allocated */
|
|
char **p; /* parameter list */
|
|
};
|
|
|
|
/*
|
|
* Free the list of positional parameters.
|
|
*/
|
|
static void
|
|
freeparam(volatile struct shparam *param)
|
|
{
|
|
if (param->malloced) {
|
|
char **ap, **ap1;
|
|
ap = ap1 = param->p;
|
|
while (*ap)
|
|
free(*ap++);
|
|
free(ap1);
|
|
}
|
|
}
|
|
|
|
#if ENABLE_ASH_GETOPTS
|
|
static void FAST_FUNC getoptsreset(const char *value);
|
|
#endif
|
|
|
|
struct var {
|
|
struct var *next; /* next entry in hash list */
|
|
int flags; /* flags are defined above */
|
|
const char *var_text; /* name=value */
|
|
void (*var_func)(const char *) FAST_FUNC; /* function to be called when */
|
|
/* the variable gets set/unset */
|
|
};
|
|
|
|
struct localvar {
|
|
struct localvar *next; /* next local variable in list */
|
|
struct var *vp; /* the variable that was made local */
|
|
int flags; /* saved flags */
|
|
const char *text; /* saved text */
|
|
};
|
|
|
|
/* flags */
|
|
#define VEXPORT 0x01 /* variable is exported */
|
|
#define VREADONLY 0x02 /* variable cannot be modified */
|
|
#define VSTRFIXED 0x04 /* variable struct is statically allocated */
|
|
#define VTEXTFIXED 0x08 /* text is statically allocated */
|
|
#define VSTACK 0x10 /* text is allocated on the stack */
|
|
#define VUNSET 0x20 /* the variable is not set */
|
|
#define VNOFUNC 0x40 /* don't call the callback function */
|
|
#define VNOSET 0x80 /* do not set variable - just readonly test */
|
|
#define VNOSAVE 0x100 /* when text is on the heap before setvareq */
|
|
#if ENABLE_ASH_RANDOM_SUPPORT
|
|
# define VDYNAMIC 0x200 /* dynamic variable */
|
|
#else
|
|
# define VDYNAMIC 0
|
|
#endif
|
|
|
|
|
|
/* Need to be before varinit_data[] */
|
|
#if ENABLE_LOCALE_SUPPORT
|
|
static void FAST_FUNC
|
|
change_lc_all(const char *value)
|
|
{
|
|
if (value && *value != '\0')
|
|
setlocale(LC_ALL, value);
|
|
}
|
|
static void FAST_FUNC
|
|
change_lc_ctype(const char *value)
|
|
{
|
|
if (value && *value != '\0')
|
|
setlocale(LC_CTYPE, value);
|
|
}
|
|
#endif
|
|
#if ENABLE_ASH_MAIL
|
|
static void chkmail(void);
|
|
static void changemail(const char *var_value) FAST_FUNC;
|
|
#else
|
|
# define chkmail() ((void)0)
|
|
#endif
|
|
static void changepath(const char *) FAST_FUNC;
|
|
#if ENABLE_ASH_RANDOM_SUPPORT
|
|
static void change_random(const char *) FAST_FUNC;
|
|
#endif
|
|
#if BASH_EPOCH_VARS
|
|
static void change_seconds(const char *) FAST_FUNC;
|
|
static void change_realtime(const char *) FAST_FUNC;
|
|
#endif
|
|
|
|
static const struct {
|
|
int flags;
|
|
const char *var_text;
|
|
void (*var_func)(const char *) FAST_FUNC;
|
|
} varinit_data[] = {
|
|
/*
|
|
* Note: VEXPORT would not work correctly here for NOFORK applets:
|
|
* some environment strings may be constant.
|
|
*/
|
|
{ VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
|
|
#if ENABLE_ASH_MAIL
|
|
{ VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
|
|
{ VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail },
|
|
#endif
|
|
{ VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
|
|
{ VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
|
|
{ VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
|
|
{ VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
|
|
#if ENABLE_ASH_GETOPTS
|
|
{ VSTRFIXED|VTEXTFIXED , defoptindvar, getoptsreset },
|
|
#endif
|
|
{ VSTRFIXED|VTEXTFIXED , NULL /* inited to linenovar */, NULL },
|
|
#if ENABLE_ASH_RANDOM_SUPPORT
|
|
{ VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random },
|
|
#endif
|
|
#if BASH_EPOCH_VARS
|
|
{ VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "EPOCHSECONDS", change_seconds },
|
|
{ VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "EPOCHREALTIME", change_realtime },
|
|
#endif
|
|
#if ENABLE_LOCALE_SUPPORT
|
|
{ VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all },
|
|
{ VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype },
|
|
#endif
|
|
#if ENABLE_FEATURE_EDITING_SAVEHISTORY
|
|
{ VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL },
|
|
#endif
|
|
};
|
|
|
|
struct redirtab;
|
|
|
|
struct globals_var {
|
|
struct shparam shellparam; /* $@ current positional parameters */
|
|
struct redirtab *redirlist;
|
|
int preverrout_fd; /* stderr fd: usually 2, unless redirect moved it */
|
|
struct var *vartab[VTABSIZE];
|
|
struct var varinit[ARRAY_SIZE(varinit_data)];
|
|
int lineno;
|
|
char linenovar[sizeof("LINENO=") + sizeof(int)*3];
|
|
};
|
|
extern struct globals_var *BB_GLOBAL_CONST ash_ptr_to_globals_var;
|
|
#define G_var (*ash_ptr_to_globals_var)
|
|
#define shellparam (G_var.shellparam )
|
|
//#define redirlist (G_var.redirlist )
|
|
#define preverrout_fd (G_var.preverrout_fd)
|
|
#define vartab (G_var.vartab )
|
|
#define varinit (G_var.varinit )
|
|
#define lineno (G_var.lineno )
|
|
#define linenovar (G_var.linenovar )
|
|
#define vifs varinit[0]
|
|
#if ENABLE_ASH_MAIL
|
|
# define vmail varinit[1]
|
|
# define vmpath varinit[2]
|
|
#endif
|
|
#define VAR_OFFSET1 (ENABLE_ASH_MAIL*2)
|
|
#define vpath varinit[VAR_OFFSET1 + 1]
|
|
#define vps1 varinit[VAR_OFFSET1 + 2]
|
|
#define vps2 varinit[VAR_OFFSET1 + 3]
|
|
#define vps4 varinit[VAR_OFFSET1 + 4]
|
|
#if ENABLE_ASH_GETOPTS
|
|
# define voptind varinit[VAR_OFFSET1 + 5]
|
|
#endif
|
|
#define VAR_OFFSET2 (VAR_OFFSET1 + ENABLE_ASH_GETOPTS)
|
|
#define vlineno varinit[VAR_OFFSET2 + 5]
|
|
#if ENABLE_ASH_RANDOM_SUPPORT
|
|
# define vrandom varinit[VAR_OFFSET2 + 6]
|
|
#endif
|
|
#define VAR_OFFSET3 (VAR_OFFSET2 + ENABLE_ASH_RANDOM_SUPPORT)
|
|
#if BASH_EPOCH_VARS
|
|
# define vepochs varinit[VAR_OFFSET3 + 6]
|
|
# define vepochr varinit[VAR_OFFSET3 + 7]
|
|
#endif
|
|
#define INIT_G_var() do { \
|
|
unsigned i; \
|
|
(*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
|
|
barrier(); \
|
|
for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
|
|
varinit[i].flags = varinit_data[i].flags; \
|
|
varinit[i].var_text = varinit_data[i].var_text; \
|
|
varinit[i].var_func = varinit_data[i].var_func; \
|
|
} \
|
|
strcpy(linenovar, "LINENO="); \
|
|
vlineno.var_text = linenovar; \
|
|
} while (0)
|
|
|
|
/*
|
|
* The following macros access the values of the above variables.
|
|
* They have to skip over the name. They return the null string
|
|
* for unset variables.
|
|
*/
|
|
#define ifsval() (vifs.var_text + 4)
|
|
#define ifsset() ((vifs.flags & VUNSET) == 0)
|
|
#if ENABLE_ASH_MAIL
|
|
# define mailval() (vmail.var_text + 5)
|
|
# define mpathval() (vmpath.var_text + 9)
|
|
# define mpathset() ((vmpath.flags & VUNSET) == 0)
|
|
#endif
|
|
#define pathval() (vpath.var_text + 5)
|
|
#define ps1val() (vps1.var_text + 4)
|
|
#define ps2val() (vps2.var_text + 4)
|
|
#define ps4val() (vps4.var_text + 4)
|
|
#if ENABLE_ASH_GETOPTS
|
|
# define optindval() (voptind.var_text + 7)
|
|
#endif
|
|
|
|
#if ENABLE_ASH_GETOPTS
|
|
static void FAST_FUNC
|
|
getoptsreset(const char *value)
|
|
{
|
|
shellparam.optind = 1;
|
|
if (is_number(value))
|
|
shellparam.optind = number(value) ?: 1;
|
|
shellparam.optoff = -1;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Compares two strings up to the first = or '\0'. The first
|
|
* string must be terminated by '='; the second may be terminated by
|
|
* either '=' or '\0'.
|
|
*/
|
|
static int
|
|
varcmp(const char *p, const char *q)
|
|
{
|
|
int c, d;
|
|
|
|
while ((c = *p) == (d = *q)) {
|
|
if (c == '\0' || c == '=')
|
|
goto out;
|
|
p++;
|
|
q++;
|
|
}
|
|
if (c == '=')
|
|
c = '\0';
|
|
if (d == '=')
|
|
d = '\0';
|
|
out:
|
|
return c - d;
|
|
}
|
|
|
|
/*
|
|
* Find the appropriate entry in the hash table from the name.
|
|
*/
|
|
static struct var **
|
|
hashvar(const char *p)
|
|
{
|
|
unsigned hashval;
|
|
|
|
hashval = ((unsigned char) *p) << 4;
|
|
while (*p && *p != '=')
|
|
hashval += (unsigned char) *p++;
|
|
return &vartab[hashval % VTABSIZE];
|
|
}
|
|
|
|
static int
|
|
vpcmp(const void *a, const void *b)
|
|
{
|
|
return varcmp(*(const char **)a, *(const char **)b);
|
|
}
|
|
|
|
/*
|
|
* This routine initializes the builtin variables.
|
|
*/
|
|
static void
|
|
initvar(void)
|
|
{
|
|
struct var *vp;
|
|
struct var *end;
|
|
struct var **vpp;
|
|
|
|
/*
|
|
* PS1 depends on uid
|
|
*/
|
|
#if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
|
|
vps1.var_text = "PS1=\\w \\$ ";
|
|
#else
|
|
if (!geteuid())
|
|
vps1.var_text = "PS1=# ";
|
|
#endif
|
|
vp = varinit;
|
|
end = vp + ARRAY_SIZE(varinit);
|
|
do {
|
|
vpp = hashvar(vp->var_text);
|
|
vp->next = *vpp;
|
|
*vpp = vp;
|
|
} while (++vp < end);
|
|
}
|
|
|
|
static struct var **
|
|
findvar(struct var **vpp, const char *name)
|
|
{
|
|
for (; *vpp; vpp = &(*vpp)->next) {
|
|
if (varcmp((*vpp)->var_text, name) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
return vpp;
|
|
}
|
|
|
|
/*
|
|
* Find the value of a variable. Returns NULL if not set.
|
|
*/
|
|
static const char* FAST_FUNC
|
|
lookupvar(const char *name)
|
|
{
|
|
struct var *v;
|
|
|
|
v = *findvar(hashvar(name), name);
|
|
if (v) {
|
|
#if ENABLE_ASH_RANDOM_SUPPORT || BASH_EPOCH_VARS
|
|
/*
|
|
* Dynamic variables are implemented roughly the same way they are
|
|
* in bash. Namely, they're "special" so long as they aren't unset.
|
|
* As soon as they're unset, they're no longer dynamic, and dynamic
|
|
* lookup will no longer happen at that point. -- PFM.
|
|
*/
|
|
if (v->flags & VDYNAMIC)
|
|
v->var_func(NULL);
|
|
#endif
|
|
if (!(v->flags & VUNSET)) {
|
|
if (v == &vlineno && v->var_text == linenovar) {
|
|
fmtstr(linenovar+7, sizeof(linenovar)-7, "%d", lineno);
|
|
}
|
|
return var_end(v->var_text);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
#if ENABLE_UNICODE_SUPPORT
|
|
static void
|
|
reinit_unicode_for_ash(void)
|
|
{
|
|
/* Unicode support should be activated even if LANG is set
|
|
* _during_ shell execution, not only if it was set when
|
|
* shell was started. Therefore, re-check LANG every time:
|
|
*/
|
|
if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
|
|
|| ENABLE_UNICODE_USING_LOCALE
|
|
) {
|
|
const char *s = lookupvar("LC_ALL");
|
|
if (!s) s = lookupvar("LC_CTYPE");
|
|
if (!s) s = lookupvar("LANG");
|
|
reinit_unicode(s);
|
|
}
|
|
}
|
|
#else
|
|
# define reinit_unicode_for_ash() ((void)0)
|
|
#endif
|
|
|
|
/*
|
|
* Search the environment of a builtin command.
|
|
*/
|
|
static ALWAYS_INLINE const char *
|
|
bltinlookup(const char *name)
|
|
{
|
|
return lookupvar(name);
|
|
}
|
|
|
|
/*
|
|
* Same as setvar except that the variable and value are passed in
|
|
* the first argument as name=value. Since the first argument will
|
|
* be actually stored in the table, it should not be a string that
|
|
* will go away.
|
|
* Called with interrupts off.
|
|
*/
|
|
static struct var *
|
|
setvareq(char *s, int flags)
|
|
{
|
|
struct var *vp, **vpp;
|
|
|
|
vpp = hashvar(s);
|
|
flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
|
|
vpp = findvar(vpp, s);
|
|
vp = *vpp;
|
|
if (vp) {
|
|
if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
|
|
const char *n;
|
|
|
|
if (flags & VNOSAVE)
|
|
free(s);
|
|
n = vp->var_text;
|
|
exitstatus = 1;
|
|
ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
|
|
}
|
|
|
|
if (flags & VNOSET)
|
|
goto out;
|
|
|
|
if (vp->var_func && !(flags & VNOFUNC))
|
|
vp->var_func(var_end(s));
|
|
|
|
if (!(vp->flags & (VTEXTFIXED|VSTACK)))
|
|
free((char*)vp->var_text);
|
|
|
|
if (((flags & (VEXPORT|VREADONLY|VSTRFIXED|VUNSET)) | (vp->flags & VSTRFIXED)) == VUNSET) {
|
|
*vpp = vp->next;
|
|
free(vp);
|
|
out_free:
|
|
if ((flags & (VTEXTFIXED|VSTACK|VNOSAVE)) == VNOSAVE)
|
|
free(s);
|
|
goto out;
|
|
}
|
|
|
|
flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
|
|
#if ENABLE_ASH_RANDOM_SUPPORT || BASH_EPOCH_VARS
|
|
if (flags & VUNSET)
|
|
flags &= ~VDYNAMIC;
|
|
#endif
|
|
} else {
|
|
/* variable s is not found */
|
|
if (flags & VNOSET)
|
|
goto out;
|
|
if ((flags & (VEXPORT|VREADONLY|VSTRFIXED|VUNSET)) == VUNSET)
|
|
goto out_free;
|
|
vp = ckzalloc(sizeof(*vp));
|
|
vp->next = *vpp;
|
|
/*vp->func = NULL; - ckzalloc did it */
|
|
*vpp = vp;
|
|
}
|
|
if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
|
|
s = ckstrdup(s);
|
|
vp->var_text = s;
|
|
vp->flags = flags;
|
|
|
|
out:
|
|
return vp;
|
|
}
|
|
|
|
/*
|
|
* Set the value of a variable. The flags argument is ored with the
|
|
* flags of the variable. If val is NULL, the variable is unset.
|
|
*/
|
|
static struct var *
|
|
setvar(const char *name, const char *val, int flags)
|
|
{
|
|
const char *q;
|
|
char *p;
|
|
char *nameeq;
|
|
size_t namelen;
|
|
size_t vallen;
|
|
struct var *vp;
|
|
|
|
q = endofname(name);
|
|
p = strchrnul(q, '=');
|
|
namelen = p - name;
|
|
if (!namelen || p != q)
|
|
ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
|
|
vallen = 0;
|
|
if (val == NULL) {
|
|
flags |= VUNSET;
|
|
} else {
|
|
vallen = strlen(val);
|
|
}
|
|
|
|
INT_OFF;
|
|
nameeq = ckzalloc(namelen + vallen + 2);
|
|
p = mempcpy(nameeq, name, namelen);
|
|
if (val) {
|
|
*p++ = '=';
|
|
memcpy(p, val, vallen);
|
|
}
|
|
vp = setvareq(nameeq, flags | VNOSAVE);
|
|
INT_ON;
|
|
|
|
return vp;
|
|
}
|
|
|
|
static void FAST_FUNC
|
|
setvar0(const char *name, const char *val)
|
|
{
|
|
setvar(name, val, 0);
|
|
}
|
|
|
|
/*
|
|
* Unset the specified variable.
|
|
*/
|
|
static void
|
|
unsetvar(const char *s)
|
|
{
|
|
setvar(s, NULL, 0);
|
|
}
|
|
|
|
/*
|
|
* Process a linked list of variable assignments.
|
|
*/
|
|
static void
|
|
listsetvar(struct strlist *list_set_var, int flags)
|
|
{
|
|
struct strlist *lp = list_set_var;
|
|
|
|
if (!lp)
|
|
return;
|
|
INT_OFF;
|
|
do {
|
|
setvareq(lp->text, flags);
|
|
lp = lp->next;
|
|
} while (lp);
|
|
INT_ON;
|
|
}
|
|
|
|
/*
|
|
* Generate a list of variables satisfying the given conditions.
|
|
*/
|
|
#if !ENABLE_FEATURE_SH_NOFORK
|
|
# define listvars(on, off, lp, end) listvars(on, off, end)
|
|
#endif
|
|
static char **
|
|
listvars(int on, int off, struct strlist *lp, char ***end)
|
|
{
|
|
struct var **vpp;
|
|
struct var *vp;
|
|
char **ep;
|
|
int mask;
|
|
|
|
STARTSTACKSTR(ep);
|
|
vpp = vartab;
|
|
mask = on | off;
|
|
do {
|
|
for (vp = *vpp; vp; vp = vp->next) {
|
|
if ((vp->flags & mask) == on) {
|
|
#if ENABLE_FEATURE_SH_NOFORK
|
|
/* If variable with the same name is both
|
|
* exported and temporarily set for a command:
|
|
* export ZVAR=5
|
|
* ZVAR=6 printenv
|
|
* then "ZVAR=6" will be both in vartab and
|
|
* lp lists. Do not pass it twice to printenv.
|
|
*/
|
|
struct strlist *lp1 = lp;
|
|
while (lp1) {
|
|
if (strcmp(lp1->text, vp->var_text) == 0)
|
|
goto skip;
|
|
lp1 = lp1->next;
|
|
}
|
|
#endif
|
|
if (ep == stackstrend())
|
|
ep = growstackstr();
|
|
*ep++ = (char*)vp->var_text;
|
|
#if ENABLE_FEATURE_SH_NOFORK
|
|
skip: ;
|
|
#endif
|
|
}
|
|
}
|
|
} while (++vpp < vartab + VTABSIZE);
|
|
|
|
#if ENABLE_FEATURE_SH_NOFORK
|
|
while (lp) {
|
|
if (ep == stackstrend())
|
|
ep = growstackstr();
|
|
*ep++ = lp->text;
|
|
lp = lp->next;
|
|
}
|
|
#endif
|
|
|
|
if (ep == stackstrend())
|
|
ep = growstackstr();
|
|
if (end)
|
|
*end = ep;
|
|
*ep++ = NULL;
|
|
return grabstackstr(ep);
|
|
}
|
|
|
|
|
|
/* ============ Path search helper
|
|
*
|
|
* The variable path (passed by reference) should be set to the start
|
|
* of the path before the first call; path_advance will update
|
|
* this value as it proceeds. Successive calls to path_advance will return
|
|
* the possible path expansions in sequence. If an option (indicated by
|
|
* a percent sign) appears in the path entry then the global variable
|
|
* pathopt will be set to point to it; otherwise pathopt will be set to
|
|
* NULL.
|
|
*/
|
|
static const char *pathopt; /* set by path_advance */
|
|
|
|
static char *
|
|
path_advance(const char **path, const char *name)
|
|
{
|
|
const char *p;
|
|
char *q;
|
|
const char *start;
|
|
size_t len;
|
|
|
|
if (*path == NULL)
|
|
return NULL;
|
|
start = *path;
|
|
for (p = start; *p && *p != ':' && *p != '%'; p++)
|
|
continue;
|
|
len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
|
|
while (stackblocksize() < len)
|
|
growstackblock();
|
|
q = stackblock();
|
|
if (p != start) {
|
|
q = mempcpy(q, start, p - start);
|
|
*q++ = '/';
|
|
}
|
|
strcpy(q, name);
|
|
pathopt = NULL;
|
|
if (*p == '%') {
|
|
pathopt = ++p;
|
|
while (*p && *p != ':')
|
|
p++;
|
|
}
|
|
if (*p == ':')
|
|
*path = p + 1;
|
|
else
|
|
*path = NULL;
|
|
return stalloc(len);
|
|
}
|
|
|
|
|
|
/* ============ Prompt */
|
|
|
|
static smallint doprompt; /* if set, prompt the user */
|
|
static smallint needprompt; /* true if interactive and at start of line */
|
|
|
|
#if ENABLE_FEATURE_EDITING
|
|
static line_input_t *line_input_state;
|
|
static const char *cmdedit_prompt;
|
|
static void
|
|
putprompt(const char *s)
|
|
{
|
|
if (ENABLE_ASH_EXPAND_PRMT) {
|
|
free((char*)cmdedit_prompt);
|
|
cmdedit_prompt = ckstrdup(s);
|
|
return;
|
|
}
|
|
cmdedit_prompt = s;
|
|
}
|
|
#else
|
|
static void
|
|
putprompt(const char *s)
|
|
{
|
|
out2str(s);
|
|
}
|
|
#endif
|
|
|
|
/* expandstr() needs parsing machinery, so it is far away ahead... */
|
|
static const char *expandstr(const char *ps, int syntax_type);
|
|
/* Values for syntax param */
|
|
#define BASESYNTAX 0 /* not in quotes */
|
|
#define DQSYNTAX 1 /* in double quotes */
|
|
#define SQSYNTAX 2 /* in single quotes */
|
|
#define ARISYNTAX 3 /* in arithmetic */
|
|
#if ENABLE_ASH_EXPAND_PRMT
|
|
# define PSSYNTAX 4 /* prompt. never passed to SIT() */
|
|
#endif
|
|
/* PSSYNTAX expansion is identical to DQSYNTAX, except keeping '\$' as '\$' */
|
|
|
|
/*
|
|
* called by editline -- any expansions to the prompt should be added here.
|
|
*/
|
|
static void
|
|
setprompt_if(smallint do_set, int whichprompt)
|
|
{
|
|
const char *prompt;
|
|
IF_ASH_EXPAND_PRMT(struct stackmark smark;)
|
|
|
|
if (!do_set)
|
|
return;
|
|
|
|
needprompt = 0;
|
|
|
|
switch (whichprompt) {
|
|
case 1:
|
|
prompt = ps1val();
|
|
break;
|
|
case 2:
|
|
prompt = ps2val();
|
|
break;
|
|
default: /* 0 */
|
|
prompt = nullstr;
|
|
}
|
|
#if ENABLE_ASH_EXPAND_PRMT
|
|
pushstackmark(&smark, stackblocksize());
|
|
putprompt(expandstr(prompt, PSSYNTAX));
|
|
popstackmark(&smark);
|
|
#else
|
|
putprompt(prompt);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* ============ The cd and pwd commands */
|
|
|
|
#define CD_PHYSICAL 1
|
|
#define CD_PRINT 2
|
|
|
|
static int
|
|
cdopt(void)
|
|
{
|
|
int flags = 0;
|
|
int i, j;
|
|
|
|
j = 'L';
|
|
while ((i = nextopt("LP")) != '\0') {
|
|
if (i != j) {
|
|
flags ^= CD_PHYSICAL;
|
|
j = i;
|
|
}
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
|
|
/*
|
|
* Update curdir (the name of the current directory) in response to a
|
|
* cd command.
|
|
*/
|
|
static const char *
|
|
updatepwd(const char *dir)
|
|
{
|
|
char *new;
|
|
char *p;
|
|
char *cdcomppath;
|
|
const char *lim;
|
|
|
|
cdcomppath = sstrdup(dir);
|
|
STARTSTACKSTR(new);
|
|
if (*dir != '/') {
|
|
if (curdir == nullstr)
|
|
return 0;
|
|
new = stack_putstr(curdir, new);
|
|
}
|
|
new = makestrspace(strlen(dir) + 2, new);
|
|
lim = (char *)stackblock() + 1;
|
|
if (*dir != '/') {
|
|
if (new[-1] != '/')
|
|
USTPUTC('/', new);
|
|
if (new > lim && *lim == '/')
|
|
lim++;
|
|
} else {
|
|
USTPUTC('/', new);
|
|
cdcomppath++;
|
|
if (dir[1] == '/' && dir[2] != '/') {
|
|
USTPUTC('/', new);
|
|
cdcomppath++;
|
|
lim++;
|
|
}
|
|
}
|
|
p = strtok(cdcomppath, "/");
|
|
while (p) {
|
|
switch (*p) {
|
|
case '.':
|
|
if (p[1] == '.' && p[2] == '\0') {
|
|
while (new > lim) {
|
|
STUNPUTC(new);
|
|
if (new[-1] == '/')
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
if (p[1] == '\0')
|
|
break;
|
|
/* fall through */
|
|
default:
|
|
new = stack_putstr(p, new);
|
|
USTPUTC('/', new);
|
|
}
|
|
p = strtok(NULL, "/");
|
|
}
|
|
if (new > lim)
|
|
STUNPUTC(new);
|
|
*new = 0;
|
|
return stackblock();
|
|
}
|
|
|
|
/*
|
|
* Find out what the current directory is. If we already know the current
|
|
* directory, this routine returns immediately.
|
|
*/
|
|
static char *
|
|
getpwd(void)
|
|
{
|
|
char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
|
|
return dir ? dir : nullstr;
|
|
}
|
|
|
|
static void
|
|
setpwd(const char *val, int setold)
|
|
{
|
|
char *oldcur, *dir;
|
|
|
|
oldcur = dir = curdir;
|
|
|
|
if (setold) {
|
|
setvar("OLDPWD", oldcur, VEXPORT);
|
|
}
|
|
INT_OFF;
|
|
if (physdir != nullstr) {
|
|
if (physdir != oldcur)
|
|
free(physdir);
|
|
physdir = nullstr;
|
|
}
|
|
if (oldcur == val || !val) {
|
|
char *s = getpwd();
|
|
physdir = s;
|
|
if (!val)
|
|
dir = s;
|
|
} else
|
|
dir = ckstrdup(val);
|
|
if (oldcur != dir && oldcur != nullstr) {
|
|
free(oldcur);
|
|
}
|
|
curdir = dir;
|
|
INT_ON;
|
|
setvar("PWD", dir, VEXPORT);
|
|
}
|
|
|
|
static void hashcd(void);
|
|
|
|
/*
|
|
* Actually do the chdir. We also call hashcd to let other routines
|
|
* know that the current directory has changed.
|
|
*/
|
|
static int
|
|
docd(const char *dest, int flags)
|
|
{
|
|
const char *dir = NULL;
|
|
int err;
|
|
|
|
TRACE(("docd(\"%s\", %d) called\n", dest, flags));
|
|
|
|
INT_OFF;
|
|
if (!(flags & CD_PHYSICAL)) {
|
|
dir = updatepwd(dest);
|
|
if (dir)
|
|
dest = dir;
|
|
}
|
|
err = chdir(dest);
|
|
if (err)
|
|
goto out;
|
|
setpwd(dir, 1);
|
|
hashcd();
|
|
out:
|
|
INT_ON;
|
|
return err;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
const char *dest;
|
|
const char *path;
|
|
const char *p;
|
|
char c;
|
|
struct stat statb;
|
|
int flags;
|
|
|
|
flags = cdopt();
|
|
dest = *argptr;
|
|
if (!dest)
|
|
dest = bltinlookup("HOME");
|
|
else if (LONE_DASH(dest)) {
|
|
dest = bltinlookup("OLDPWD");
|
|
flags |= CD_PRINT;
|
|
}
|
|
if (!dest)
|
|
dest = nullstr;
|
|
if (*dest == '/')
|
|
goto step6;
|
|
if (*dest == '.') {
|
|
c = dest[1];
|
|
dotdot:
|
|
switch (c) {
|
|
case '\0':
|
|
case '/':
|
|
goto step6;
|
|
case '.':
|
|
c = dest[2];
|
|
if (c != '.')
|
|
goto dotdot;
|
|
}
|
|
}
|
|
if (!*dest)
|
|
dest = ".";
|
|
path = bltinlookup("CDPATH");
|
|
while (path) {
|
|
c = *path;
|
|
p = path_advance(&path, dest);
|
|
if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
|
|
if (c && c != ':')
|
|
flags |= CD_PRINT;
|
|
docd:
|
|
if (!docd(p, flags))
|
|
goto out;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
step6:
|
|
p = dest;
|
|
goto docd;
|
|
|
|
err:
|
|
ash_msg_and_raise_perror("can't cd to %s", dest);
|
|
/* NOTREACHED */
|
|
out:
|
|
if (flags & CD_PRINT)
|
|
out1fmt("%s\n", curdir);
|
|
return 0;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
int flags;
|
|
const char *dir = curdir;
|
|
|
|
flags = cdopt();
|
|
if (flags) {
|
|
if (physdir == nullstr)
|
|
setpwd(dir, 0);
|
|
dir = physdir;
|
|
}
|
|
out1fmt("%s\n", dir);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* ============ ... */
|
|
|
|
|
|
#define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024)
|
|
|
|
/* Syntax classes */
|
|
#define CWORD 0 /* character is nothing special */
|
|
#define CNL 1 /* newline character */
|
|
#define CBACK 2 /* a backslash character */
|
|
#define CSQUOTE 3 /* single quote */
|
|
#define CDQUOTE 4 /* double quote */
|
|
#define CENDQUOTE 5 /* a terminating quote */
|
|
#define CBQUOTE 6 /* backwards single quote */
|
|
#define CVAR 7 /* a dollar sign */
|
|
#define CENDVAR 8 /* a '}' character */
|
|
#define CLP 9 /* a left paren in arithmetic */
|
|
#define CRP 10 /* a right paren in arithmetic */
|
|
#define CENDFILE 11 /* end of file */
|
|
#define CCTL 12 /* like CWORD, except it must be escaped */
|
|
#define CSPCL 13 /* these terminate a word */
|
|
#define CIGN 14 /* character should be ignored */
|
|
|
|
#define PEOF 256
|
|
#if ENABLE_ASH_ALIAS
|
|
# define PEOA 257
|
|
#endif
|
|
|
|
#define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE
|
|
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
# define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12))
|
|
#else
|
|
# define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8))
|
|
#endif
|
|
static const uint16_t S_I_T[] ALIGN2 = {
|
|
#if ENABLE_ASH_ALIAS
|
|
SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */
|
|
#endif
|
|
SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */
|
|
SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */
|
|
SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */
|
|
SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */
|
|
SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */
|
|
SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */
|
|
SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */
|
|
SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */
|
|
SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */
|
|
SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */
|
|
SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */
|
|
#if !USE_SIT_FUNCTION
|
|
SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */
|
|
SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */
|
|
SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */
|
|
#endif
|
|
#undef SIT_ITEM
|
|
};
|
|
/* Constants below must match table above */
|
|
enum {
|
|
#if ENABLE_ASH_ALIAS
|
|
CSPCL_CIGN_CIGN_CIGN , /* 0 */
|
|
#endif
|
|
CSPCL_CWORD_CWORD_CWORD , /* 1 */
|
|
CNL_CNL_CNL_CNL , /* 2 */
|
|
CWORD_CCTL_CCTL_CWORD , /* 3 */
|
|
CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */
|
|
CVAR_CVAR_CWORD_CVAR , /* 5 */
|
|
CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */
|
|
CSPCL_CWORD_CWORD_CLP , /* 7 */
|
|
CSPCL_CWORD_CWORD_CRP , /* 8 */
|
|
CBACK_CBACK_CCTL_CBACK , /* 9 */
|
|
CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */
|
|
CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */
|
|
CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */
|
|
CWORD_CWORD_CWORD_CWORD , /* 13 */
|
|
CCTL_CCTL_CCTL_CCTL , /* 14 */
|
|
};
|
|
|
|
/* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF,
|
|
* caller must ensure proper cast on it if c is *char_ptr!
|
|
*/
|
|
#if USE_SIT_FUNCTION
|
|
|
|
static int
|
|
SIT(int c, int syntax)
|
|
{
|
|
/* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */
|
|
static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~";
|
|
/*
|
|
* This causes '/' to be prepended with CTLESC in dquoted string,
|
|
* making "./file"* treated incorrectly because we feed
|
|
* ".\/file*" string to glob(), confusing it (see expandmeta func).
|
|
* The "homegrown" glob implementation is okay with that,
|
|
* but glibc one isn't. With '/' always treated as CWORD,
|
|
* both work fine.
|
|
*/
|
|
# if ENABLE_ASH_ALIAS
|
|
static const uint8_t syntax_index_table[] ALIGN1 = {
|
|
1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
|
|
7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */
|
|
3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
|
|
11, 3 /* "}~" */
|
|
};
|
|
# else
|
|
static const uint8_t syntax_index_table[] ALIGN1 = {
|
|
0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
|
|
6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */
|
|
2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
|
|
10, 2 /* "}~" */
|
|
};
|
|
# endif
|
|
const char *s;
|
|
int indx;
|
|
|
|
if (c == PEOF)
|
|
return CENDFILE;
|
|
# if ENABLE_ASH_ALIAS
|
|
if (c == PEOA)
|
|
indx = 0;
|
|
else
|
|
# endif
|
|
{
|
|
/* Cast is purely for paranoia here,
|
|
* just in case someone passed signed char to us */
|
|
if ((unsigned char)c >= CTL_FIRST
|
|
&& (unsigned char)c <= CTL_LAST
|
|
) {
|
|
return CCTL;
|
|
}
|
|
s = strchrnul(spec_symbls, c);
|
|
if (*s == '\0')
|
|
return CWORD;
|
|
indx = syntax_index_table[s - spec_symbls];
|
|
}
|
|
return (S_I_T[indx] >> (syntax*4)) & 0xf;
|
|
}
|
|
|
|
#else /* !USE_SIT_FUNCTION */
|
|
|
|
static const uint8_t syntax_index_table[] ALIGN1 = {
|
|
/* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
|
|
/* 0 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 1 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 2 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 3 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 4 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 5 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 6 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 7 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 8 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 10 "\n" */ CNL_CNL_CNL_CNL,
|
|
/* 11 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 12 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 13 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 14 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 15 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 16 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 17 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 18 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 19 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 20 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 21 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 22 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 23 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 24 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 25 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 26 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 27 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 28 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 29 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 30 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 31 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 32 " " */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 33 "!" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
|
|
/* 35 "#" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 36 "$" */ CVAR_CVAR_CWORD_CVAR,
|
|
/* 37 "%" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
|
|
/* 40 "(" */ CSPCL_CWORD_CWORD_CLP,
|
|
/* 41 ")" */ CSPCL_CWORD_CWORD_CRP,
|
|
/* 42 "*" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 43 "+" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 44 "," */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 45 "-" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 46 "." */ CWORD_CWORD_CWORD_CWORD,
|
|
/* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */
|
|
/* 47 "/" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 48 "0" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 49 "1" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 50 "2" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 51 "3" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 52 "4" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 53 "5" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 54 "6" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 55 "7" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 56 "8" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 57 "9" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 58 ":" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 61 "=" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 63 "?" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 64 "@" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 65 "A" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 66 "B" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 67 "C" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 68 "D" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 69 "E" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 70 "F" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 71 "G" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 72 "H" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 73 "I" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 74 "J" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 75 "K" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 76 "L" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 77 "M" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 78 "N" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 79 "O" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 80 "P" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 82 "R" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 83 "S" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 84 "T" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 85 "U" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 86 "V" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 87 "W" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 88 "X" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 91 "[" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 92 "\" */ CBACK_CBACK_CCTL_CBACK,
|
|
/* 93 "]" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 94 "^" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 95 "_" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
|
|
/* 97 "a" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 98 "b" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 99 "c" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 100 "d" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 101 "e" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 102 "f" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 103 "g" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 104 "h" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 105 "i" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 106 "j" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 107 "k" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 108 "l" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 109 "m" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 110 "n" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 111 "o" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 112 "p" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 113 "q" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 114 "r" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 115 "s" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 116 "t" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 117 "u" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 118 "v" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 119 "w" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 120 "x" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 121 "y" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 122 "z" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 123 "{" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
|
|
/* 126 "~" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 127 del */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 128 0x80 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 137 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 138 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 139 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 140 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 141 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 142 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 143 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 144 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 145 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 146 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 147 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 148 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 149 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 150 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 151 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 152 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 153 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 154 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 155 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 156 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 157 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 158 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 159 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 160 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 161 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 162 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 163 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 164 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 165 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 166 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 167 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 168 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 169 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 170 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 171 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 172 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 173 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 174 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 175 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 176 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 177 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 178 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 179 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 180 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 181 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 182 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 183 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 184 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 185 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 186 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 187 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 188 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 189 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 190 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 191 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 192 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 193 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 194 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 195 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 196 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 197 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 198 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 199 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 200 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 201 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 202 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 203 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 204 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 205 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 206 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 207 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 208 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 209 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 210 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 211 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 212 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 213 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 214 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 215 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 216 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 217 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 218 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 219 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 220 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 221 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 222 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 223 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 224 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 225 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 226 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 227 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 228 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 229 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 230 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 231 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 232 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 233 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 234 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 235 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 236 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 237 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 238 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 239 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 230 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 241 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 242 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 243 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 244 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 245 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 246 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 247 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 248 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 249 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 250 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 251 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 252 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 253 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 254 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 255 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
|
|
# if ENABLE_ASH_ALIAS
|
|
/* PEOA */ CSPCL_CIGN_CIGN_CIGN,
|
|
# endif
|
|
};
|
|
|
|
#if 1
|
|
# define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf)
|
|
#else /* debug version, caught one signed char bug */
|
|
# define SIT(c, syntax) \
|
|
({ \
|
|
if ((c) < 0 || (c) > (PEOF + ENABLE_ASH_ALIAS)) \
|
|
bb_error_msg_and_die("line:%d c:%d", __LINE__, (c)); \
|
|
if ((syntax) < 0 || (syntax) > (2 + ENABLE_FEATURE_SH_MATH)) \
|
|
bb_error_msg_and_die("line:%d c:%d", __LINE__, (c)); \
|
|
((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf); \
|
|
})
|
|
#endif
|
|
|
|
#endif /* !USE_SIT_FUNCTION */
|
|
|
|
|
|
/* ============ Alias handling */
|
|
|
|
#if ENABLE_ASH_ALIAS
|
|
|
|
#define ALIASINUSE 1
|
|
#define ALIASDEAD 2
|
|
|
|
struct alias {
|
|
struct alias *next;
|
|
char *name;
|
|
char *val;
|
|
int flag;
|
|
};
|
|
|
|
|
|
static struct alias **atab; // [ATABSIZE];
|
|
#define INIT_G_alias() do { \
|
|
atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
|
|
} while (0)
|
|
|
|
|
|
static struct alias **
|
|
__lookupalias(const char *name)
|
|
{
|
|
unsigned int hashval;
|
|
struct alias **app;
|
|
const char *p;
|
|
unsigned int ch;
|
|
|
|
p = name;
|
|
|
|
ch = (unsigned char)*p;
|
|
hashval = ch << 4;
|
|
while (ch) {
|
|
hashval += ch;
|
|
ch = (unsigned char)*++p;
|
|
}
|
|
app = &atab[hashval % ATABSIZE];
|
|
|
|
for (; *app; app = &(*app)->next) {
|
|
if (strcmp(name, (*app)->name) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return app;
|
|
}
|
|
|
|
static struct alias *
|
|
lookupalias(const char *name, int check)
|
|
{
|
|
struct alias *ap = *__lookupalias(name);
|
|
|
|
if (check && ap && (ap->flag & ALIASINUSE))
|
|
return NULL;
|
|
return ap;
|
|
}
|
|
|
|
static struct alias *
|
|
freealias(struct alias *ap)
|
|
{
|
|
struct alias *next;
|
|
|
|
if (ap->flag & ALIASINUSE) {
|
|
ap->flag |= ALIASDEAD;
|
|
return ap;
|
|
}
|
|
|
|
next = ap->next;
|
|
free(ap->name);
|
|
free(ap->val);
|
|
free(ap);
|
|
return next;
|
|
}
|
|
|
|
static void
|
|
setalias(const char *name, const char *val)
|
|
{
|
|
struct alias *ap, **app;
|
|
|
|
app = __lookupalias(name);
|
|
ap = *app;
|
|
INT_OFF;
|
|
if (ap) {
|
|
if (!(ap->flag & ALIASINUSE)) {
|
|
free(ap->val);
|
|
}
|
|
ap->val = ckstrdup(val);
|
|
ap->flag &= ~ALIASDEAD;
|
|
} else {
|
|
/* not found */
|
|
ap = ckzalloc(sizeof(struct alias));
|
|
ap->name = ckstrdup(name);
|
|
ap->val = ckstrdup(val);
|
|
/*ap->flag = 0; - ckzalloc did it */
|
|
/*ap->next = NULL;*/
|
|
*app = ap;
|
|
}
|
|
INT_ON;
|
|
}
|
|
|
|
static int
|
|
unalias(const char *name)
|
|
{
|
|
struct alias **app;
|
|
|
|
app = __lookupalias(name);
|
|
|
|
if (*app) {
|
|
INT_OFF;
|
|
*app = freealias(*app);
|
|
INT_ON;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
rmaliases(void)
|
|
{
|
|
struct alias *ap, **app;
|
|
int i;
|
|
|
|
INT_OFF;
|
|
for (i = 0; i < ATABSIZE; i++) {
|
|
app = &atab[i];
|
|
for (ap = *app; ap; ap = *app) {
|
|
*app = freealias(*app);
|
|
if (ap == *app) {
|
|
app = &ap->next;
|
|
}
|
|
}
|
|
}
|
|
INT_ON;
|
|
}
|
|
|
|
static void
|
|
printalias(const struct alias *ap)
|
|
{
|
|
out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
|
|
}
|
|
|
|
/*
|
|
* TODO - sort output
|
|
*/
|
|
static int FAST_FUNC
|
|
aliascmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
char *n, *v;
|
|
int ret = 0;
|
|
struct alias *ap;
|
|
|
|
if (!argv[1]) {
|
|
int i;
|
|
|
|
for (i = 0; i < ATABSIZE; i++) {
|
|
for (ap = atab[i]; ap; ap = ap->next) {
|
|
printalias(ap);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
while ((n = *++argv) != NULL) {
|
|
v = strchr(n+1, '=');
|
|
if (v == NULL) { /* n+1: funny ksh stuff */
|
|
ap = *__lookupalias(n);
|
|
if (ap == NULL) {
|
|
fprintf(stderr, "%s: %s not found\n", "alias", n);
|
|
ret = 1;
|
|
} else
|
|
printalias(ap);
|
|
} else {
|
|
*v++ = '\0';
|
|
setalias(n, v);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
int i;
|
|
|
|
while (nextopt("a") != '\0') {
|
|
rmaliases();
|
|
return 0;
|
|
}
|
|
for (i = 0; *argptr; argptr++) {
|
|
if (unalias(*argptr)) {
|
|
fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
|
|
i = 1;
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
#endif /* ASH_ALIAS */
|
|
|
|
|
|
/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
|
|
#define FORK_FG 0
|
|
#define FORK_BG 1
|
|
#define FORK_NOJOB 2
|
|
|
|
/* mode flags for showjob(s) */
|
|
#define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
|
|
#define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
|
|
#define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
|
|
#define SHOW_STDERR 0x08 /* print to stderr (else stdout) */
|
|
|
|
/*
|
|
* A job structure contains information about a job. A job is either a
|
|
* single process or a set of processes contained in a pipeline. In the
|
|
* latter case, pidlist will be non-NULL, and will point to a -1 terminated
|
|
* array of pids.
|
|
*/
|
|
struct procstat {
|
|
pid_t ps_pid; /* process id */
|
|
int ps_status; /* last process status from wait() */
|
|
char *ps_cmd; /* text of command being run */
|
|
};
|
|
|
|
struct job {
|
|
struct procstat ps0; /* status of process */
|
|
struct procstat *ps; /* status of processes when more than one */
|
|
#if JOBS
|
|
int stopstatus; /* status of a stopped job */
|
|
#endif
|
|
unsigned nprocs; /* number of processes */
|
|
|
|
#define JOBRUNNING 0 /* at least one proc running */
|
|
#define JOBSTOPPED 1 /* all procs are stopped */
|
|
#define JOBDONE 2 /* all procs are completed */
|
|
unsigned
|
|
state: 8,
|
|
#if JOBS
|
|
sigint: 1, /* job was killed by SIGINT */
|
|
jobctl: 1, /* job running under job control */
|
|
#endif
|
|
waited: 1, /* true if this entry has been waited for */
|
|
used: 1, /* true if this entry is in used */
|
|
changed: 1; /* true if status has changed */
|
|
struct job *prev_job; /* previous job */
|
|
};
|
|
|
|
static struct job *makejob(/*union node *,*/ int);
|
|
static int forkshell(struct job *, union node *, int);
|
|
static int waitforjob(struct job *);
|
|
|
|
#if !JOBS
|
|
enum { doing_jobctl = 0 };
|
|
#define setjobctl(on) do {} while (0)
|
|
#else
|
|
static smallint doing_jobctl; //references:8
|
|
static void setjobctl(int);
|
|
#endif
|
|
|
|
/*
|
|
* Ignore a signal.
|
|
*/
|
|
static void
|
|
ignoresig(int signo)
|
|
{
|
|
/* Avoid unnecessary system calls. Is it already SIG_IGNed? */
|
|
if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
|
|
/* No, need to do it */
|
|
signal(signo, SIG_IGN);
|
|
}
|
|
sigmode[signo - 1] = S_HARD_IGN;
|
|
}
|
|
|
|
/*
|
|
* Only one usage site - in setsignal()
|
|
*/
|
|
static void
|
|
signal_handler(int signo)
|
|
{
|
|
if (signo == SIGCHLD) {
|
|
got_sigchld = 1;
|
|
if (!trap[SIGCHLD])
|
|
return;
|
|
}
|
|
|
|
gotsig[signo - 1] = 1;
|
|
pending_sig = signo;
|
|
|
|
if (signo == SIGINT && !trap[SIGINT]) {
|
|
if (!suppress_int) {
|
|
pending_sig = 0;
|
|
raise_interrupt(); /* does not return */
|
|
}
|
|
pending_int = 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set the signal handler for the specified signal. The routine figures
|
|
* out what it should be set to.
|
|
*/
|
|
static void
|
|
setsignal(int signo)
|
|
{
|
|
char *t;
|
|
char cur_act, new_act;
|
|
struct sigaction act;
|
|
|
|
t = trap[signo];
|
|
new_act = S_DFL;
|
|
if (t != NULL) { /* trap for this sig is set */
|
|
new_act = S_CATCH;
|
|
if (t[0] == '\0') /* trap is "": ignore this sig */
|
|
new_act = S_IGN;
|
|
}
|
|
|
|
if (rootshell && new_act == S_DFL) {
|
|
switch (signo) {
|
|
case SIGINT:
|
|
if (iflag || minusc || sflag == 0)
|
|
new_act = S_CATCH;
|
|
break;
|
|
case SIGQUIT:
|
|
#if DEBUG
|
|
if (debug)
|
|
break;
|
|
#endif
|
|
/* man bash:
|
|
* "In all cases, bash ignores SIGQUIT. Non-builtin
|
|
* commands run by bash have signal handlers
|
|
* set to the values inherited by the shell
|
|
* from its parent". */
|
|
new_act = S_IGN;
|
|
break;
|
|
case SIGTERM:
|
|
if (iflag)
|
|
new_act = S_IGN;
|
|
break;
|
|
#if JOBS
|
|
case SIGTSTP:
|
|
case SIGTTOU:
|
|
if (mflag)
|
|
new_act = S_IGN;
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
/* if !rootshell, we reset SIGQUIT to DFL,
|
|
* whereas we have to restore it to what shell got on entry.
|
|
* This is handled by the fact that if signal was IGNored on entry,
|
|
* then cur_act is S_HARD_IGN and we never change its sigaction
|
|
* (see code below).
|
|
*/
|
|
|
|
if (signo == SIGCHLD)
|
|
new_act = S_CATCH;
|
|
|
|
t = &sigmode[signo - 1];
|
|
cur_act = *t;
|
|
if (cur_act == 0) {
|
|
/* current setting is not yet known */
|
|
if (sigaction(signo, NULL, &act)) {
|
|
/* pretend it worked; maybe we should give a warning,
|
|
* but other shells don't. We don't alter sigmode,
|
|
* so we retry every time.
|
|
* btw, in Linux it never fails. --vda */
|
|
return;
|
|
}
|
|
if (act.sa_handler == SIG_IGN) {
|
|
cur_act = S_HARD_IGN;
|
|
if (mflag
|
|
&& (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
|
|
) {
|
|
cur_act = S_IGN; /* don't hard ignore these */
|
|
}
|
|
}
|
|
if (act.sa_handler == SIG_DFL && new_act == S_DFL) {
|
|
/* installing SIG_DFL over SIG_DFL is a no-op */
|
|
/* saves one sigaction call in each "sh -c SCRIPT" invocation */
|
|
*t = S_DFL;
|
|
return;
|
|
}
|
|
}
|
|
if (cur_act == S_HARD_IGN || cur_act == new_act)
|
|
return;
|
|
|
|
*t = new_act;
|
|
|
|
act.sa_handler = SIG_DFL;
|
|
switch (new_act) {
|
|
case S_CATCH:
|
|
act.sa_handler = signal_handler;
|
|
break;
|
|
case S_IGN:
|
|
act.sa_handler = SIG_IGN;
|
|
break;
|
|
}
|
|
/* flags and mask matter only if !DFL and !IGN, but we do it
|
|
* for all cases for more deterministic behavior:
|
|
*/
|
|
act.sa_flags = 0; //TODO: why not SA_RESTART?
|
|
sigfillset(&act.sa_mask);
|
|
|
|
sigaction_set(signo, &act);
|
|
}
|
|
|
|
/* mode flags for set_curjob */
|
|
#define CUR_DELETE 2
|
|
#define CUR_RUNNING 1
|
|
#define CUR_STOPPED 0
|
|
|
|
#if JOBS
|
|
/* pgrp of shell on invocation */
|
|
static int initialpgrp; //references:2
|
|
static int ttyfd = -1; //5
|
|
#endif
|
|
/* array of jobs */
|
|
static struct job *jobtab; //5
|
|
/* size of array */
|
|
static unsigned njobs; //4
|
|
/* current job */
|
|
static struct job *curjob; //lots
|
|
/* number of presumed living untracked jobs */
|
|
static int jobless; //4
|
|
|
|
#if 0
|
|
/* Bash has a feature: it restores termios after a successful wait for
|
|
* a foreground job which had at least one stopped or sigkilled member.
|
|
* The probable rationale is that SIGSTOP and SIGKILL can preclude task from
|
|
* properly restoring tty state. Should we do this too?
|
|
* A reproducer: ^Z an interactive python:
|
|
*
|
|
* # python
|
|
* Python 2.7.12 (...)
|
|
* >>> ^Z
|
|
* { python leaves tty in -icanon -echo state. We do survive that... }
|
|
* [1]+ Stopped python
|
|
* { ...however, next program (python #2) does not survive it well: }
|
|
* # python
|
|
* Python 2.7.12 (...)
|
|
* >>> Traceback (most recent call last):
|
|
* { above, I typed "qwerty<CR>", but -echo state is still in effect }
|
|
* File "<stdin>", line 1, in <module>
|
|
* NameError: name 'qwerty' is not defined
|
|
*
|
|
* The implementation below is modeled on bash code and seems to work.
|
|
* However, I'm not sure we should do this. For one: what if I'd fg
|
|
* the stopped python instead? It'll be confused by "restored" tty state.
|
|
*/
|
|
static struct termios shell_tty_info;
|
|
static void
|
|
get_tty_state(void)
|
|
{
|
|
if (rootshell && ttyfd >= 0)
|
|
tcgetattr(ttyfd, &shell_tty_info);
|
|
}
|
|
static void
|
|
set_tty_state(void)
|
|
{
|
|
/* if (rootshell) - caller ensures this */
|
|
if (ttyfd >= 0)
|
|
tcsetattr(ttyfd, TCSADRAIN, &shell_tty_info);
|
|
}
|
|
static int
|
|
job_signal_status(struct job *jp)
|
|
{
|
|
int status;
|
|
unsigned i;
|
|
struct procstat *ps = jp->ps;
|
|
for (i = 0; i < jp->nprocs; i++) {
|
|
status = ps[i].ps_status;
|
|
if (WIFSIGNALED(status) || WIFSTOPPED(status))
|
|
return status;
|
|
}
|
|
return 0;
|
|
}
|
|
static void
|
|
restore_tty_if_stopped_or_signaled(struct job *jp)
|
|
{
|
|
//TODO: check what happens if we come from waitforjob() in expbackq()
|
|
if (rootshell) {
|
|
int s = job_signal_status(jp);
|
|
if (s) /* WIFSIGNALED(s) || WIFSTOPPED(s) */
|
|
set_tty_state();
|
|
}
|
|
}
|
|
#else
|
|
# define get_tty_state() ((void)0)
|
|
# define restore_tty_if_stopped_or_signaled(jp) ((void)0)
|
|
#endif
|
|
|
|
static void
|
|
set_curjob(struct job *jp, unsigned mode)
|
|
{
|
|
struct job *jp1;
|
|
struct job **jpp, **curp;
|
|
|
|
/* first remove from list */
|
|
jpp = curp = &curjob;
|
|
while (1) {
|
|
jp1 = *jpp;
|
|
if (jp1 == jp)
|
|
break;
|
|
jpp = &jp1->prev_job;
|
|
}
|
|
*jpp = jp1->prev_job;
|
|
|
|
/* Then re-insert in correct position */
|
|
jpp = curp;
|
|
switch (mode) {
|
|
default:
|
|
#if DEBUG
|
|
abort();
|
|
#endif
|
|
case CUR_DELETE:
|
|
/* job being deleted */
|
|
break;
|
|
case CUR_RUNNING:
|
|
/* newly created job or backgrounded job,
|
|
* put after all stopped jobs.
|
|
*/
|
|
while (1) {
|
|
jp1 = *jpp;
|
|
#if JOBS
|
|
if (!jp1 || jp1->state != JOBSTOPPED)
|
|
#endif
|
|
break;
|
|
jpp = &jp1->prev_job;
|
|
}
|
|
/* FALLTHROUGH */
|
|
#if JOBS
|
|
case CUR_STOPPED:
|
|
#endif
|
|
/* newly stopped job - becomes curjob */
|
|
jp->prev_job = *jpp;
|
|
*jpp = jp;
|
|
break;
|
|
}
|
|
}
|
|
|
|
#if JOBS || DEBUG
|
|
static int
|
|
jobno(const struct job *jp)
|
|
{
|
|
return jp - jobtab + 1;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Convert a job name to a job structure.
|
|
*/
|
|
#if !JOBS
|
|
#define getjob(name, getctl) getjob(name)
|
|
#endif
|
|
static struct job *
|
|
getjob(const char *name, int getctl)
|
|
{
|
|
struct job *jp;
|
|
struct job *found;
|
|
const char *err_msg = "%s: no such job";
|
|
unsigned num;
|
|
int c;
|
|
const char *p;
|
|
char *(*match)(const char *, const char *);
|
|
|
|
jp = curjob;
|
|
p = name;
|
|
if (!p)
|
|
goto currentjob;
|
|
|
|
if (*p != '%')
|
|
goto err;
|
|
|
|
c = *++p;
|
|
if (!c)
|
|
goto currentjob;
|
|
|
|
if (!p[1]) {
|
|
if (c == '+' || c == '%') {
|
|
currentjob:
|
|
err_msg = "No current job";
|
|
goto check;
|
|
}
|
|
if (c == '-') {
|
|
if (jp)
|
|
jp = jp->prev_job;
|
|
err_msg = "No previous job";
|
|
check:
|
|
if (!jp)
|
|
goto err;
|
|
goto gotit;
|
|
}
|
|
}
|
|
|
|
if (is_number(p)) {
|
|
num = atoi(p);
|
|
if (num > 0 && num <= njobs) {
|
|
jp = jobtab + num - 1;
|
|
if (jp->used)
|
|
goto gotit;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
match = prefix;
|
|
if (*p == '?') {
|
|
match = strstr;
|
|
p++;
|
|
}
|
|
|
|
found = NULL;
|
|
while (jp) {
|
|
if (match(jp->ps[0].ps_cmd, p)) {
|
|
if (found)
|
|
goto err;
|
|
found = jp;
|
|
err_msg = "%s: ambiguous";
|
|
}
|
|
jp = jp->prev_job;
|
|
}
|
|
if (!found)
|
|
goto err;
|
|
jp = found;
|
|
|
|
gotit:
|
|
#if JOBS
|
|
err_msg = "job %s not created under job control";
|
|
if (getctl && jp->jobctl == 0)
|
|
goto err;
|
|
#endif
|
|
return jp;
|
|
err:
|
|
ash_msg_and_raise_error(err_msg, name);
|
|
}
|
|
|
|
/*
|
|
* Mark a job structure as unused.
|
|
*/
|
|
static void
|
|
freejob(struct job *jp)
|
|
{
|
|
struct procstat *ps;
|
|
int i;
|
|
|
|
INT_OFF;
|
|
for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
|
|
if (ps->ps_cmd != nullstr)
|
|
free(ps->ps_cmd);
|
|
}
|
|
if (jp->ps != &jp->ps0)
|
|
free(jp->ps);
|
|
jp->used = 0;
|
|
set_curjob(jp, CUR_DELETE);
|
|
INT_ON;
|
|
}
|
|
|
|
#if JOBS
|
|
static void
|
|
xtcsetpgrp(int fd, pid_t pgrp)
|
|
{
|
|
if (tcsetpgrp(fd, pgrp))
|
|
ash_msg_and_raise_perror("can't set tty process group");
|
|
}
|
|
|
|
/*
|
|
* Turn job control on and off.
|
|
*
|
|
* Note: This code assumes that the third arg to ioctl is a character
|
|
* pointer, which is true on Berkeley systems but not System V. Since
|
|
* System V doesn't have job control yet, this isn't a problem now.
|
|
*
|
|
* Called with interrupts off.
|
|
*/
|
|
static void
|
|
setjobctl(int on)
|
|
{
|
|
int fd;
|
|
int pgrp;
|
|
|
|
if (on == doing_jobctl || rootshell == 0)
|
|
return;
|
|
if (on) {
|
|
int ofd;
|
|
ofd = fd = open(_PATH_TTY, O_RDWR);
|
|
if (fd < 0) {
|
|
/* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
|
|
* That sometimes helps to acquire controlling tty.
|
|
* Obviously, a workaround for bugs when someone
|
|
* failed to provide a controlling tty to bash! :) */
|
|
fd = 2;
|
|
while (!isatty(fd))
|
|
if (--fd < 0)
|
|
goto out;
|
|
}
|
|
/* fd is a tty at this point */
|
|
fd = fcntl(fd, F_DUPFD_CLOEXEC, 10);
|
|
if (ofd >= 0) /* if it is "/dev/tty", close. If 0/1/2, don't */
|
|
close(ofd);
|
|
if (fd < 0)
|
|
goto out; /* F_DUPFD failed */
|
|
if (F_DUPFD_CLOEXEC == F_DUPFD) /* if old libc (w/o F_DUPFD_CLOEXEC) */
|
|
close_on_exec_on(fd);
|
|
while (1) { /* while we are in the background */
|
|
pgrp = tcgetpgrp(fd);
|
|
if (pgrp < 0) {
|
|
out:
|
|
ash_msg("can't access tty; job control turned off");
|
|
mflag = on = 0;
|
|
goto close;
|
|
}
|
|
if (pgrp == getpgrp())
|
|
break;
|
|
killpg(0, SIGTTIN);
|
|
}
|
|
initialpgrp = pgrp;
|
|
|
|
setsignal(SIGTSTP);
|
|
setsignal(SIGTTOU);
|
|
setsignal(SIGTTIN);
|
|
pgrp = rootpid;
|
|
setpgid(0, pgrp);
|
|
xtcsetpgrp(fd, pgrp);
|
|
} else {
|
|
/* turning job control off */
|
|
fd = ttyfd;
|
|
pgrp = initialpgrp;
|
|
/* was xtcsetpgrp, but this can make exiting ash
|
|
* loop forever if pty is already deleted */
|
|
tcsetpgrp(fd, pgrp);
|
|
setpgid(0, pgrp);
|
|
setsignal(SIGTSTP);
|
|
setsignal(SIGTTOU);
|
|
setsignal(SIGTTIN);
|
|
close:
|
|
if (fd >= 0)
|
|
close(fd);
|
|
fd = -1;
|
|
}
|
|
ttyfd = fd;
|
|
doing_jobctl = on;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
killcmd(int argc, char **argv)
|
|
{
|
|
if (argv[1] && strcmp(argv[1], "-l") != 0) {
|
|
int i = 1;
|
|
do {
|
|
if (argv[i][0] == '%') {
|
|
/*
|
|
* "kill %N" - job kill
|
|
* Converting to pgrp / pid kill
|
|
*/
|
|
struct job *jp;
|
|
char *dst;
|
|
int j, n;
|
|
|
|
jp = getjob(argv[i], 0);
|
|
/*
|
|
* In jobs started under job control, we signal
|
|
* entire process group by kill -PGRP_ID.
|
|
* This happens, f.e., in interactive shell.
|
|
*
|
|
* Otherwise, we signal each child via
|
|
* kill PID1 PID2 PID3.
|
|
* Testcases:
|
|
* sh -c 'sleep 1|sleep 1 & kill %1'
|
|
* sh -c 'true|sleep 2 & sleep 1; kill %1'
|
|
* sh -c 'true|sleep 1 & sleep 2; kill %1'
|
|
*/
|
|
n = jp->nprocs; /* can't be 0 (I hope) */
|
|
if (jp->jobctl)
|
|
n = 1;
|
|
dst = alloca(n * sizeof(int)*4);
|
|
argv[i] = dst;
|
|
for (j = 0; j < n; j++) {
|
|
struct procstat *ps = &jp->ps[j];
|
|
/* Skip non-running and not-stopped members
|
|
* (i.e. dead members) of the job
|
|
*/
|
|
if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
|
|
continue;
|
|
/*
|
|
* kill_main has matching code to expect
|
|
* leading space. Needed to not confuse
|
|
* negative pids with "kill -SIGNAL_NO" syntax
|
|
*/
|
|
dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
|
|
}
|
|
*dst = '\0';
|
|
}
|
|
} while (argv[++i]);
|
|
}
|
|
return kill_main(argc, argv);
|
|
}
|
|
|
|
static void
|
|
showpipe(struct job *jp /*, FILE *out*/)
|
|
{
|
|
struct procstat *ps;
|
|
struct procstat *psend;
|
|
|
|
psend = jp->ps + jp->nprocs;
|
|
for (ps = jp->ps + 1; ps < psend; ps++)
|
|
printf(" | %s", ps->ps_cmd);
|
|
newline_and_flush(stdout);
|
|
flush_stdout_stderr();
|
|
}
|
|
|
|
|
|
static int
|
|
restartjob(struct job *jp, int mode)
|
|
{
|
|
struct procstat *ps;
|
|
int i;
|
|
int status;
|
|
pid_t pgid;
|
|
|
|
INT_OFF;
|
|
if (jp->state == JOBDONE)
|
|
goto out;
|
|
jp->state = JOBRUNNING;
|
|
pgid = jp->ps[0].ps_pid;
|
|
if (mode == FORK_FG) {
|
|
get_tty_state();
|
|
xtcsetpgrp(ttyfd, pgid);
|
|
}
|
|
killpg(pgid, SIGCONT);
|
|
ps = jp->ps;
|
|
i = jp->nprocs;
|
|
do {
|
|
if (WIFSTOPPED(ps->ps_status)) {
|
|
ps->ps_status = -1;
|
|
}
|
|
ps++;
|
|
} while (--i);
|
|
out:
|
|
status = (mode == FORK_FG) ? waitforjob(jp) : 0;
|
|
INT_ON;
|
|
return status;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
fg_bgcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct job *jp;
|
|
int mode;
|
|
int retval;
|
|
|
|
mode = (**argv == 'f') ? FORK_FG : FORK_BG;
|
|
nextopt(nullstr);
|
|
argv = argptr;
|
|
do {
|
|
jp = getjob(*argv, 1);
|
|
if (mode == FORK_BG) {
|
|
set_curjob(jp, CUR_RUNNING);
|
|
printf("[%d] ", jobno(jp));
|
|
}
|
|
out1str(jp->ps[0].ps_cmd);
|
|
showpipe(jp /*, stdout*/);
|
|
retval = restartjob(jp, mode);
|
|
} while (*argv && *++argv);
|
|
return retval;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
sprint_status48(char *s, int status, int sigonly)
|
|
{
|
|
int col;
|
|
int st;
|
|
|
|
col = 0;
|
|
if (!WIFEXITED(status)) {
|
|
#if JOBS
|
|
if (WIFSTOPPED(status))
|
|
st = WSTOPSIG(status);
|
|
else
|
|
#endif
|
|
st = WTERMSIG(status);
|
|
if (sigonly) {
|
|
if (st == SIGINT || st == SIGPIPE)
|
|
goto out;
|
|
#if JOBS
|
|
if (WIFSTOPPED(status))
|
|
goto out;
|
|
#endif
|
|
}
|
|
st &= 0x7f;
|
|
//TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
|
|
col = fmtstr(s, 32, strsignal(st));
|
|
if (WCOREDUMP(status)) {
|
|
strcpy(s + col, " (core dumped)");
|
|
col += sizeof(" (core dumped)")-1;
|
|
}
|
|
} else if (!sigonly) {
|
|
st = WEXITSTATUS(status);
|
|
col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st);
|
|
}
|
|
out:
|
|
return col;
|
|
}
|
|
|
|
static int
|
|
wait_block_or_sig(int *status)
|
|
{
|
|
int pid;
|
|
|
|
do {
|
|
sigset_t mask;
|
|
|
|
/* Poll all children for changes in their state */
|
|
got_sigchld = 0;
|
|
/* if job control is active, accept stopped processes too */
|
|
pid = waitpid(-1, status, doing_jobctl ? (WNOHANG|WUNTRACED) : WNOHANG);
|
|
if (pid != 0)
|
|
break; /* Error (e.g. EINTR, ECHILD) or pid */
|
|
|
|
/* Children exist, but none are ready. Sleep until interesting signal */
|
|
#if 1
|
|
sigfillset(&mask);
|
|
sigprocmask2(SIG_SETMASK, &mask); /* mask is updated */
|
|
while (!got_sigchld && !pending_sig)
|
|
sigsuspend(&mask);
|
|
sigprocmask(SIG_SETMASK, &mask, NULL);
|
|
#else /* unsafe: a signal can set pending_sig after check, but before pause() */
|
|
while (!got_sigchld && !pending_sig)
|
|
pause();
|
|
#endif
|
|
|
|
/* If it was SIGCHLD, poll children again */
|
|
} while (got_sigchld);
|
|
|
|
return pid;
|
|
}
|
|
|
|
#define DOWAIT_NONBLOCK 0
|
|
#define DOWAIT_BLOCK 1
|
|
#define DOWAIT_BLOCK_OR_SIG 2
|
|
#if BASH_WAIT_N
|
|
# define DOWAIT_JOBSTATUS 0x10 /* OR this to get job's exitstatus instead of pid */
|
|
#endif
|
|
|
|
static int
|
|
dowait(int block, struct job *job)
|
|
{
|
|
int pid;
|
|
int status;
|
|
struct job *jp;
|
|
struct job *thisjob;
|
|
#if BASH_WAIT_N
|
|
bool want_jobexitstatus = (block & DOWAIT_JOBSTATUS);
|
|
block = (block & ~DOWAIT_JOBSTATUS);
|
|
#endif
|
|
|
|
TRACE(("dowait(0x%x) called\n", block));
|
|
|
|
/* It's wrong to call waitpid() outside of INT_OFF region:
|
|
* signal can arrive just after syscall return and handler can
|
|
* longjmp away, losing stop/exit notification processing.
|
|
* Thus, for "jobs" builtin, and for waiting for a fg job,
|
|
* we call waitpid() (blocking or non-blocking) inside INT_OFF.
|
|
*
|
|
* However, for "wait" builtin it is wrong to simply call waitpid()
|
|
* in INT_OFF region: "wait" needs to wait for any running job
|
|
* to change state, but should exit on any trap too.
|
|
* In INT_OFF region, a signal just before syscall entry can set
|
|
* pending_sig variables, but we can't check them, and we would
|
|
* either enter a sleeping waitpid() (BUG), or need to busy-loop.
|
|
*
|
|
* Because of this, we run inside INT_OFF, but use a special routine
|
|
* which combines waitpid() and sigsuspend().
|
|
* This is the reason why we need to have a handler for SIGCHLD:
|
|
* SIG_DFL handler does not wake sigsuspend().
|
|
*/
|
|
INT_OFF;
|
|
if (block == DOWAIT_BLOCK_OR_SIG) {
|
|
pid = wait_block_or_sig(&status);
|
|
} else {
|
|
int wait_flags = 0;
|
|
if (block == DOWAIT_NONBLOCK)
|
|
wait_flags = WNOHANG;
|
|
/* if job control is active, accept stopped processes too */
|
|
if (doing_jobctl)
|
|
wait_flags |= WUNTRACED;
|
|
/* NB: _not_ safe_waitpid, we need to detect EINTR */
|
|
pid = waitpid(-1, &status, wait_flags);
|
|
}
|
|
TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
|
|
pid, status, errno, strerror(errno)));
|
|
thisjob = NULL;
|
|
if (pid <= 0)
|
|
goto out;
|
|
|
|
for (jp = curjob; jp; jp = jp->prev_job) {
|
|
int jobstate;
|
|
struct procstat *ps;
|
|
struct procstat *psend;
|
|
if (jp->state == JOBDONE)
|
|
continue;
|
|
jobstate = JOBDONE;
|
|
ps = jp->ps;
|
|
psend = ps + jp->nprocs;
|
|
do {
|
|
if (ps->ps_pid == pid) {
|
|
TRACE(("Job %d: changing status of proc %d "
|
|
"from 0x%x to 0x%x\n",
|
|
jobno(jp), pid, ps->ps_status, status));
|
|
ps->ps_status = status;
|
|
thisjob = jp;
|
|
}
|
|
if (ps->ps_status == -1)
|
|
jobstate = JOBRUNNING;
|
|
#if JOBS
|
|
if (jobstate == JOBRUNNING)
|
|
continue;
|
|
if (WIFSTOPPED(ps->ps_status)) {
|
|
jp->stopstatus = ps->ps_status;
|
|
jobstate = JOBSTOPPED;
|
|
}
|
|
#endif
|
|
} while (++ps < psend);
|
|
if (!thisjob)
|
|
continue;
|
|
|
|
/* Found the job where one of its processes changed its state.
|
|
* Is there at least one live and running process in this job? */
|
|
if (jobstate != JOBRUNNING) {
|
|
/* No. All live processes in the job are stopped
|
|
* (JOBSTOPPED) or there are no live processes (JOBDONE)
|
|
*/
|
|
thisjob->changed = 1;
|
|
if (thisjob->state != jobstate) {
|
|
TRACE(("Job %d: changing state from %d to %d\n",
|
|
jobno(thisjob), thisjob->state, jobstate));
|
|
thisjob->state = jobstate;
|
|
#if JOBS
|
|
if (jobstate == JOBSTOPPED)
|
|
set_curjob(thisjob, CUR_STOPPED);
|
|
#endif
|
|
}
|
|
}
|
|
goto out;
|
|
}
|
|
/* The process wasn't found in job list */
|
|
#if JOBS
|
|
if (!WIFSTOPPED(status))
|
|
jobless--;
|
|
#endif
|
|
out:
|
|
INT_ON;
|
|
|
|
#if BASH_WAIT_N
|
|
if (want_jobexitstatus) {
|
|
pid = -1;
|
|
if (thisjob && thisjob->state == JOBDONE)
|
|
pid = thisjob->ps[thisjob->nprocs - 1].ps_status;
|
|
}
|
|
#endif
|
|
if (thisjob && thisjob == job) {
|
|
char s[48 + 1];
|
|
int len;
|
|
|
|
len = sprint_status48(s, status, 1);
|
|
if (len) {
|
|
s[len] = '\n';
|
|
s[len + 1] = '\0';
|
|
out2str(s);
|
|
}
|
|
}
|
|
return pid;
|
|
}
|
|
|
|
#if JOBS
|
|
static void
|
|
showjob(struct job *jp, int mode)
|
|
{
|
|
struct procstat *ps;
|
|
struct procstat *psend;
|
|
int col;
|
|
int indent_col;
|
|
char s[16 + 16 + 48];
|
|
FILE *out = (mode & SHOW_STDERR ? stderr : stdout);
|
|
|
|
ps = jp->ps;
|
|
|
|
if (mode & SHOW_ONLY_PGID) { /* jobs -p */
|
|
/* just output process (group) id of pipeline */
|
|
fprintf(out, "%d\n", ps->ps_pid);
|
|
return;
|
|
}
|
|
|
|
col = fmtstr(s, 16, "[%d] ", jobno(jp));
|
|
indent_col = col;
|
|
|
|
if (jp == curjob)
|
|
s[col - 3] = '+';
|
|
else if (curjob && jp == curjob->prev_job)
|
|
s[col - 3] = '-';
|
|
|
|
if (mode & SHOW_PIDS)
|
|
col += fmtstr(s + col, 16, "%d ", ps->ps_pid);
|
|
|
|
psend = ps + jp->nprocs;
|
|
|
|
if (jp->state == JOBRUNNING) {
|
|
strcpy(s + col, "Running");
|
|
col += sizeof("Running") - 1;
|
|
} else {
|
|
int status = psend[-1].ps_status;
|
|
if (jp->state == JOBSTOPPED)
|
|
status = jp->stopstatus;
|
|
col += sprint_status48(s + col, status, 0);
|
|
}
|
|
/* By now, "[JOBID]* [maybe PID] STATUS" is printed */
|
|
|
|
/* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
|
|
* or prints several "PID | <cmdN>" lines,
|
|
* depending on SHOW_PIDS bit.
|
|
* We do not print status of individual processes
|
|
* between PID and <cmdN>. bash does it, but not very well:
|
|
* first line shows overall job status, not process status,
|
|
* making it impossible to know 1st process status.
|
|
*/
|
|
goto start;
|
|
do {
|
|
/* for each process */
|
|
s[0] = '\0';
|
|
col = 33;
|
|
if (mode & SHOW_PIDS)
|
|
col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1;
|
|
start:
|
|
fprintf(out, "%s%*c%s%s",
|
|
s,
|
|
33 - col >= 0 ? 33 - col : 0, ' ',
|
|
ps == jp->ps ? "" : "| ",
|
|
ps->ps_cmd
|
|
);
|
|
} while (++ps != psend);
|
|
newline_and_flush(out);
|
|
|
|
jp->changed = 0;
|
|
|
|
if (jp->state == JOBDONE) {
|
|
TRACE(("showjob: freeing job %d\n", jobno(jp)));
|
|
freejob(jp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Print a list of jobs. If "change" is nonzero, only print jobs whose
|
|
* statuses have changed since the last call to showjobs.
|
|
*/
|
|
static void
|
|
showjobs(int mode)
|
|
{
|
|
struct job *jp;
|
|
|
|
TRACE(("showjobs(0x%x) called\n", mode));
|
|
|
|
/* Handle all finished jobs */
|
|
while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
|
|
continue;
|
|
|
|
for (jp = curjob; jp; jp = jp->prev_job) {
|
|
if (!(mode & SHOW_CHANGED) || jp->changed) {
|
|
showjob(jp, mode);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
jobscmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
int mode, m;
|
|
|
|
mode = 0;
|
|
while ((m = nextopt("lp")) != '\0') {
|
|
if (m == 'l')
|
|
mode |= SHOW_PIDS;
|
|
else
|
|
mode |= SHOW_ONLY_PGID;
|
|
}
|
|
|
|
argv = argptr;
|
|
if (*argv) {
|
|
do
|
|
showjob(getjob(*argv, 0), mode);
|
|
while (*++argv);
|
|
} else {
|
|
showjobs(mode);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* JOBS */
|
|
|
|
/* Called only on finished or stopped jobs (no members are running) */
|
|
static int
|
|
getstatus(struct job *job)
|
|
{
|
|
int status;
|
|
int retval;
|
|
struct procstat *ps;
|
|
|
|
/* Fetch last member's status */
|
|
ps = job->ps + job->nprocs - 1;
|
|
status = ps->ps_status;
|
|
if (pipefail) {
|
|
/* "set -o pipefail" mode: use last _nonzero_ status */
|
|
while (status == 0 && --ps >= job->ps)
|
|
status = ps->ps_status;
|
|
}
|
|
|
|
retval = WEXITSTATUS(status);
|
|
if (!WIFEXITED(status)) {
|
|
#if JOBS
|
|
retval = WSTOPSIG(status);
|
|
if (!WIFSTOPPED(status))
|
|
#endif
|
|
{
|
|
/* XXX: limits number of signals */
|
|
retval = WTERMSIG(status);
|
|
#if JOBS
|
|
if (retval == SIGINT)
|
|
job->sigint = 1;
|
|
#endif
|
|
}
|
|
retval += 128;
|
|
}
|
|
TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
|
|
jobno(job), job->nprocs, status, retval));
|
|
return retval;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
waitcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct job *job;
|
|
int retval;
|
|
struct job *jp;
|
|
#if BASH_WAIT_N
|
|
int status;
|
|
char one = nextopt("n");
|
|
#else
|
|
nextopt(nullstr);
|
|
#endif
|
|
retval = 0;
|
|
|
|
argv = argptr;
|
|
if (!argv[0]) {
|
|
/* wait for all jobs / one job if -n */
|
|
for (;;) {
|
|
jp = curjob;
|
|
#if BASH_WAIT_N
|
|
if (one && !jp)
|
|
/* exitcode of "wait -n" with nothing to wait for is 127, not 0 */
|
|
retval = 127;
|
|
#endif
|
|
while (1) {
|
|
if (!jp) /* no running procs */
|
|
goto ret;
|
|
if (jp->state == JOBRUNNING)
|
|
break;
|
|
jp->waited = 1;
|
|
jp = jp->prev_job;
|
|
}
|
|
/* man bash:
|
|
* "When bash is waiting for an asynchronous command via
|
|
* the wait builtin, the reception of a signal for which a trap
|
|
* has been set will cause the wait builtin to return immediately
|
|
* with an exit status greater than 128, immediately after which
|
|
* the trap is executed."
|
|
*/
|
|
#if BASH_WAIT_N
|
|
status = dowait(DOWAIT_BLOCK_OR_SIG | DOWAIT_JOBSTATUS, NULL);
|
|
#else
|
|
dowait(DOWAIT_BLOCK_OR_SIG, NULL);
|
|
#endif
|
|
/* if child sends us a signal *and immediately exits*,
|
|
* dowait() returns pid > 0. Check this case,
|
|
* not "if (dowait() < 0)"!
|
|
*/
|
|
if (pending_sig)
|
|
goto sigout;
|
|
#if BASH_WAIT_N
|
|
if (one) {
|
|
/* wait -n waits for one _job_, not one _process_.
|
|
* date; sleep 3 & sleep 2 | sleep 1 & wait -n; date
|
|
* should wait for 2 seconds. Not 1 or 3.
|
|
*/
|
|
if (status != -1 && !WIFSTOPPED(status)) {
|
|
retval = WEXITSTATUS(status);
|
|
if (WIFSIGNALED(status))
|
|
retval = WTERMSIG(status) + 128;
|
|
goto ret;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
retval = 127;
|
|
do {
|
|
if (**argv != '%') {
|
|
pid_t pid = number(*argv);
|
|
job = curjob;
|
|
while (1) {
|
|
if (!job)
|
|
goto repeat;
|
|
if (job->ps[job->nprocs - 1].ps_pid == pid)
|
|
break;
|
|
job = job->prev_job;
|
|
}
|
|
} else {
|
|
job = getjob(*argv, 0);
|
|
}
|
|
/* loop until process terminated or stopped */
|
|
while (job->state == JOBRUNNING) {
|
|
dowait(DOWAIT_BLOCK_OR_SIG, NULL);
|
|
if (pending_sig)
|
|
goto sigout;
|
|
}
|
|
job->waited = 1;
|
|
retval = getstatus(job);
|
|
repeat: ;
|
|
} while (*++argv);
|
|
|
|
ret:
|
|
return retval;
|
|
sigout:
|
|
retval = 128 + pending_sig;
|
|
return retval;
|
|
}
|
|
|
|
static struct job *
|
|
growjobtab(void)
|
|
{
|
|
size_t len;
|
|
ptrdiff_t offset;
|
|
struct job *jp, *jq;
|
|
|
|
len = njobs * sizeof(*jp);
|
|
jq = jobtab;
|
|
jp = ckrealloc(jq, len + 4 * sizeof(*jp));
|
|
|
|
offset = (char *)jp - (char *)jq;
|
|
if (offset) {
|
|
/* Relocate pointers */
|
|
size_t l = len;
|
|
|
|
jq = (struct job *)((char *)jq + l);
|
|
while (l) {
|
|
l -= sizeof(*jp);
|
|
jq--;
|
|
#define joff(p) ((struct job *)((char *)(p) + l))
|
|
#define jmove(p) (p) = (void *)((char *)(p) + offset)
|
|
if (joff(jp)->ps == &jq->ps0)
|
|
jmove(joff(jp)->ps);
|
|
if (joff(jp)->prev_job)
|
|
jmove(joff(jp)->prev_job);
|
|
}
|
|
if (curjob)
|
|
jmove(curjob);
|
|
#undef joff
|
|
#undef jmove
|
|
}
|
|
|
|
njobs += 4;
|
|
jobtab = jp;
|
|
jp = (struct job *)((char *)jp + len);
|
|
jq = jp + 3;
|
|
do {
|
|
jq->used = 0;
|
|
} while (--jq >= jp);
|
|
return jp;
|
|
}
|
|
|
|
/*
|
|
* Return a new job structure.
|
|
* Called with interrupts off.
|
|
*/
|
|
static struct job *
|
|
makejob(/*union node *node,*/ int nprocs)
|
|
{
|
|
int i;
|
|
struct job *jp;
|
|
|
|
for (i = njobs, jp = jobtab; ; jp++) {
|
|
if (--i < 0) {
|
|
jp = growjobtab();
|
|
break;
|
|
}
|
|
if (jp->used == 0)
|
|
break;
|
|
if (jp->state != JOBDONE || !jp->waited)
|
|
continue;
|
|
#if JOBS
|
|
if (doing_jobctl)
|
|
continue;
|
|
#endif
|
|
freejob(jp);
|
|
break;
|
|
}
|
|
memset(jp, 0, sizeof(*jp));
|
|
#if JOBS
|
|
/* jp->jobctl is a bitfield.
|
|
* "jp->jobctl |= doing_jobctl" likely to give awful code */
|
|
if (doing_jobctl)
|
|
jp->jobctl = 1;
|
|
#endif
|
|
jp->prev_job = curjob;
|
|
curjob = jp;
|
|
jp->used = 1;
|
|
jp->ps = &jp->ps0;
|
|
if (nprocs > 1) {
|
|
jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
|
|
}
|
|
TRACE(("makejob(%d) returns %%%d\n", nprocs,
|
|
jobno(jp)));
|
|
return jp;
|
|
}
|
|
|
|
#if JOBS
|
|
/*
|
|
* Return a string identifying a command (to be printed by the
|
|
* jobs command).
|
|
*/
|
|
static char *cmdnextc;
|
|
|
|
static void
|
|
cmdputs(const char *s)
|
|
{
|
|
static const char vstype[VSTYPE + 1][3] = {
|
|
"", "}", "-", "+", "?", "=",
|
|
"%", "%%", "#", "##"
|
|
IF_BASH_SUBSTR(, ":")
|
|
IF_BASH_PATTERN_SUBST(, "/", "//")
|
|
};
|
|
|
|
const char *p, *str;
|
|
char cc[2];
|
|
char *nextc;
|
|
unsigned char c;
|
|
unsigned char subtype = 0;
|
|
int quoted = 0;
|
|
|
|
cc[1] = '\0';
|
|
nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
|
|
p = s;
|
|
while ((c = *p++) != '\0') {
|
|
str = NULL;
|
|
switch (c) {
|
|
case CTLESC:
|
|
c = *p++;
|
|
break;
|
|
case CTLVAR:
|
|
subtype = *p++;
|
|
if ((subtype & VSTYPE) == VSLENGTH)
|
|
str = "${#";
|
|
else
|
|
str = "${";
|
|
goto dostr;
|
|
case CTLENDVAR:
|
|
str = "\"}" + !(quoted & 1);
|
|
quoted >>= 1;
|
|
subtype = 0;
|
|
goto dostr;
|
|
case CTLBACKQ:
|
|
str = "$(...)";
|
|
goto dostr;
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
case CTLARI:
|
|
str = "$((";
|
|
goto dostr;
|
|
case CTLENDARI:
|
|
str = "))";
|
|
goto dostr;
|
|
#endif
|
|
case CTLQUOTEMARK:
|
|
quoted ^= 1;
|
|
c = '"';
|
|
break;
|
|
case '=':
|
|
if (subtype == 0)
|
|
break;
|
|
if ((subtype & VSTYPE) != VSNORMAL)
|
|
quoted <<= 1;
|
|
str = vstype[subtype & VSTYPE];
|
|
if (subtype & VSNUL)
|
|
c = ':';
|
|
else
|
|
goto checkstr;
|
|
break;
|
|
case '\'':
|
|
case '\\':
|
|
case '"':
|
|
case '$':
|
|
/* These can only happen inside quotes */
|
|
cc[0] = c;
|
|
str = cc;
|
|
//FIXME:
|
|
// $ true $$ &
|
|
// $ <cr>
|
|
// [1]+ Done true ${\$} <<=== BUG: ${\$} is not a valid way to write $$ (${$} would be ok)
|
|
c = '\\';
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
USTPUTC(c, nextc);
|
|
checkstr:
|
|
if (!str)
|
|
continue;
|
|
dostr:
|
|
while ((c = *str++) != '\0') {
|
|
USTPUTC(c, nextc);
|
|
}
|
|
} /* while *p++ not NUL */
|
|
|
|
if (quoted & 1) {
|
|
USTPUTC('"', nextc);
|
|
}
|
|
*nextc = 0;
|
|
cmdnextc = nextc;
|
|
}
|
|
|
|
/* cmdtxt() and cmdlist() call each other */
|
|
static void cmdtxt(union node *n);
|
|
|
|
static void
|
|
cmdlist(union node *np, int sep)
|
|
{
|
|
for (; np; np = np->narg.next) {
|
|
if (!sep)
|
|
cmdputs(" ");
|
|
cmdtxt(np);
|
|
if (sep && np->narg.next)
|
|
cmdputs(" ");
|
|
}
|
|
}
|
|
|
|
static void
|
|
cmdtxt(union node *n)
|
|
{
|
|
union node *np;
|
|
struct nodelist *lp;
|
|
const char *p;
|
|
|
|
if (!n)
|
|
return;
|
|
switch (n->type) {
|
|
default:
|
|
#if DEBUG
|
|
abort();
|
|
#endif
|
|
case NPIPE:
|
|
lp = n->npipe.cmdlist;
|
|
for (;;) {
|
|
cmdtxt(lp->n);
|
|
lp = lp->next;
|
|
if (!lp)
|
|
break;
|
|
cmdputs(" | ");
|
|
}
|
|
break;
|
|
case NSEMI:
|
|
p = "; ";
|
|
goto binop;
|
|
case NAND:
|
|
p = " && ";
|
|
goto binop;
|
|
case NOR:
|
|
p = " || ";
|
|
binop:
|
|
cmdtxt(n->nbinary.ch1);
|
|
cmdputs(p);
|
|
n = n->nbinary.ch2;
|
|
goto donode;
|
|
case NREDIR:
|
|
case NBACKGND:
|
|
n = n->nredir.n;
|
|
goto donode;
|
|
case NNOT:
|
|
cmdputs("!");
|
|
n = n->nnot.com;
|
|
donode:
|
|
cmdtxt(n);
|
|
break;
|
|
case NIF:
|
|
cmdputs("if ");
|
|
cmdtxt(n->nif.test);
|
|
cmdputs("; then ");
|
|
if (n->nif.elsepart) {
|
|
cmdtxt(n->nif.ifpart);
|
|
cmdputs("; else ");
|
|
n = n->nif.elsepart;
|
|
} else {
|
|
n = n->nif.ifpart;
|
|
}
|
|
p = "; fi";
|
|
goto dotail;
|
|
case NSUBSHELL:
|
|
cmdputs("(");
|
|
n = n->nredir.n;
|
|
p = ")";
|
|
goto dotail;
|
|
case NWHILE:
|
|
p = "while ";
|
|
goto until;
|
|
case NUNTIL:
|
|
p = "until ";
|
|
until:
|
|
cmdputs(p);
|
|
cmdtxt(n->nbinary.ch1);
|
|
n = n->nbinary.ch2;
|
|
p = "; done";
|
|
dodo:
|
|
cmdputs("; do ");
|
|
dotail:
|
|
cmdtxt(n);
|
|
goto dotail2;
|
|
case NFOR:
|
|
cmdputs("for ");
|
|
cmdputs(n->nfor.var);
|
|
cmdputs(" in ");
|
|
cmdlist(n->nfor.args, 1);
|
|
n = n->nfor.body;
|
|
p = "; done";
|
|
goto dodo;
|
|
case NDEFUN:
|
|
cmdputs(n->ndefun.text);
|
|
p = "() { ... }";
|
|
goto dotail2;
|
|
case NCMD:
|
|
cmdlist(n->ncmd.args, 1);
|
|
cmdlist(n->ncmd.redirect, 0);
|
|
break;
|
|
case NARG:
|
|
p = n->narg.text;
|
|
dotail2:
|
|
cmdputs(p);
|
|
break;
|
|
case NHERE:
|
|
case NXHERE:
|
|
p = "<<...";
|
|
goto dotail2;
|
|
case NCASE:
|
|
cmdputs("case ");
|
|
cmdputs(n->ncase.expr->narg.text);
|
|
cmdputs(" in ");
|
|
for (np = n->ncase.cases; np; np = np->nclist.next) {
|
|
cmdtxt(np->nclist.pattern);
|
|
cmdputs(") ");
|
|
cmdtxt(np->nclist.body);
|
|
cmdputs(";; ");
|
|
}
|
|
p = "esac";
|
|
goto dotail2;
|
|
case NTO:
|
|
p = ">";
|
|
goto redir;
|
|
case NCLOBBER:
|
|
p = ">|";
|
|
goto redir;
|
|
case NAPPEND:
|
|
p = ">>";
|
|
goto redir;
|
|
#if BASH_REDIR_OUTPUT
|
|
case NTO2:
|
|
#endif
|
|
case NTOFD:
|
|
p = ">&";
|
|
goto redir;
|
|
case NFROM:
|
|
p = "<";
|
|
goto redir;
|
|
case NFROMFD:
|
|
p = "<&";
|
|
goto redir;
|
|
case NFROMTO:
|
|
p = "<>";
|
|
redir:
|
|
cmdputs(utoa(n->nfile.fd));
|
|
cmdputs(p);
|
|
if (n->type == NTOFD || n->type == NFROMFD) {
|
|
if (n->ndup.dupfd >= 0)
|
|
cmdputs(utoa(n->ndup.dupfd));
|
|
else
|
|
cmdputs("-");
|
|
break;
|
|
}
|
|
n = n->nfile.fname;
|
|
goto donode;
|
|
}
|
|
}
|
|
|
|
static char *
|
|
commandtext(union node *n)
|
|
{
|
|
char *name;
|
|
|
|
STARTSTACKSTR(cmdnextc);
|
|
cmdtxt(n);
|
|
name = stackblock();
|
|
TRACE(("commandtext: name %p, end %p\n", name, cmdnextc));
|
|
return ckstrdup(name);
|
|
}
|
|
#endif /* JOBS */
|
|
|
|
/*
|
|
* Fork off a subshell. If we are doing job control, give the subshell its
|
|
* own process group. Jp is a job structure that the job is to be added to.
|
|
* N is the command that will be evaluated by the child. Both jp and n may
|
|
* be NULL. The mode parameter can be one of the following:
|
|
* FORK_FG - Fork off a foreground process.
|
|
* FORK_BG - Fork off a background process.
|
|
* FORK_NOJOB - Like FORK_FG, but don't give the process its own
|
|
* process group even if job control is on.
|
|
*
|
|
* When job control is turned off, background processes have their standard
|
|
* input redirected to /dev/null (except for the second and later processes
|
|
* in a pipeline).
|
|
*
|
|
* Called with interrupts off.
|
|
*/
|
|
/*
|
|
* Clear traps on a fork.
|
|
*/
|
|
static void
|
|
clear_traps(void)
|
|
{
|
|
char **tp;
|
|
|
|
INT_OFF;
|
|
for (tp = trap; tp < &trap[NSIG]; tp++) {
|
|
if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
|
|
if (trap_ptr == trap)
|
|
free(*tp);
|
|
/* else: it "belongs" to trap_ptr vector, don't free */
|
|
*tp = NULL;
|
|
if ((tp - trap) != 0)
|
|
setsignal(tp - trap);
|
|
}
|
|
}
|
|
may_have_traps = 0;
|
|
INT_ON;
|
|
}
|
|
|
|
/* Lives far away from here, needed for forkchild */
|
|
static void closescript(void);
|
|
|
|
/* Called after fork(), in child */
|
|
/* jp and n are NULL when called by openhere() for heredoc support */
|
|
static NOINLINE void
|
|
forkchild(struct job *jp, union node *n, int mode)
|
|
{
|
|
int oldlvl;
|
|
|
|
TRACE(("Child shell %d\n", getpid()));
|
|
oldlvl = shlvl;
|
|
shlvl++;
|
|
|
|
/* man bash: "Non-builtin commands run by bash have signal handlers
|
|
* set to the values inherited by the shell from its parent".
|
|
* Do we do it correctly? */
|
|
|
|
closescript();
|
|
|
|
if (mode == FORK_NOJOB /* is it `xxx` ? */
|
|
&& n && n->type == NCMD /* is it single cmd? */
|
|
/* && n->ncmd.args->type == NARG - always true? */
|
|
&& n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0
|
|
&& n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
|
|
/* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
|
|
) {
|
|
TRACE(("Trap hack\n"));
|
|
/* Awful hack for `trap` or $(trap).
|
|
*
|
|
* http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
|
|
* contains an example where "trap" is executed in a subshell:
|
|
*
|
|
* save_traps=$(trap)
|
|
* ...
|
|
* eval "$save_traps"
|
|
*
|
|
* Standard does not say that "trap" in subshell shall print
|
|
* parent shell's traps. It only says that its output
|
|
* must have suitable form, but then, in the above example
|
|
* (which is not supposed to be normative), it implies that.
|
|
*
|
|
* bash (and probably other shell) does implement it
|
|
* (traps are reset to defaults, but "trap" still shows them),
|
|
* but as a result, "trap" logic is hopelessly messed up:
|
|
*
|
|
* # trap
|
|
* trap -- 'echo Ho' SIGWINCH <--- we have a handler
|
|
* # (trap) <--- trap is in subshell - no output (correct, traps are reset)
|
|
* # true | trap <--- trap is in subshell - no output (ditto)
|
|
* # echo `true | trap` <--- in subshell - output (but traps are reset!)
|
|
* trap -- 'echo Ho' SIGWINCH
|
|
* # echo `(trap)` <--- in subshell in subshell - output
|
|
* trap -- 'echo Ho' SIGWINCH
|
|
* # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
|
|
* trap -- 'echo Ho' SIGWINCH
|
|
*
|
|
* The rules when to forget and when to not forget traps
|
|
* get really complex and nonsensical.
|
|
*
|
|
* Our solution: ONLY bare $(trap) or `trap` is special.
|
|
*/
|
|
/* Save trap handler strings for trap builtin to print */
|
|
trap_ptr = xmemdup(trap, sizeof(trap));
|
|
/* Fall through into clearing traps */
|
|
}
|
|
clear_traps();
|
|
#if JOBS
|
|
/* do job control only in root shell */
|
|
doing_jobctl = 0;
|
|
if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
|
|
pid_t pgrp;
|
|
|
|
if (jp->nprocs == 0)
|
|
pgrp = getpid();
|
|
else
|
|
pgrp = jp->ps[0].ps_pid;
|
|
/* this can fail because we are doing it in the parent also */
|
|
setpgid(0, pgrp);
|
|
if (mode == FORK_FG)
|
|
xtcsetpgrp(ttyfd, pgrp);
|
|
setsignal(SIGTSTP);
|
|
setsignal(SIGTTOU);
|
|
} else
|
|
#endif
|
|
if (mode == FORK_BG) {
|
|
/* man bash: "When job control is not in effect,
|
|
* asynchronous commands ignore SIGINT and SIGQUIT" */
|
|
ignoresig(SIGINT);
|
|
ignoresig(SIGQUIT);
|
|
if (jp->nprocs == 0) {
|
|
close(0);
|
|
if (open(bb_dev_null, O_RDONLY) != 0)
|
|
ash_msg_and_raise_perror("can't open '%s'", bb_dev_null);
|
|
}
|
|
}
|
|
if (oldlvl == 0) {
|
|
if (iflag) { /* why if iflag only? */
|
|
setsignal(SIGINT);
|
|
setsignal(SIGTERM);
|
|
}
|
|
/* man bash:
|
|
* "In all cases, bash ignores SIGQUIT. Non-builtin
|
|
* commands run by bash have signal handlers
|
|
* set to the values inherited by the shell
|
|
* from its parent".
|
|
* Take care of the second rule: */
|
|
setsignal(SIGQUIT);
|
|
}
|
|
#if JOBS
|
|
if (n && n->type == NCMD
|
|
&& n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0
|
|
) {
|
|
TRACE(("Job hack\n"));
|
|
/* "jobs": we do not want to clear job list for it,
|
|
* instead we remove only _its_ own_ job from job list.
|
|
* This makes "jobs .... | cat" more useful.
|
|
*/
|
|
freejob(curjob);
|
|
return;
|
|
}
|
|
#endif
|
|
for (jp = curjob; jp; jp = jp->prev_job)
|
|
freejob(jp);
|
|
jobless = 0;
|
|
}
|
|
|
|
/* Called after fork(), in parent */
|
|
#if !JOBS
|
|
#define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
|
|
#endif
|
|
static void
|
|
forkparent(struct job *jp, union node *n, int mode, pid_t pid)
|
|
{
|
|
TRACE(("In parent shell: child = %d\n", pid));
|
|
if (!jp) {
|
|
/* jp is NULL when called by openhere() for heredoc support */
|
|
while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
|
|
continue;
|
|
jobless++;
|
|
return;
|
|
}
|
|
#if JOBS
|
|
if (mode != FORK_NOJOB && jp->jobctl) {
|
|
int pgrp;
|
|
|
|
if (jp->nprocs == 0)
|
|
pgrp = pid;
|
|
else
|
|
pgrp = jp->ps[0].ps_pid;
|
|
/* This can fail because we are doing it in the child also */
|
|
setpgid(pid, pgrp);
|
|
}
|
|
#endif
|
|
if (mode == FORK_BG) {
|
|
backgndpid = pid; /* set $! */
|
|
set_curjob(jp, CUR_RUNNING);
|
|
}
|
|
if (jp) {
|
|
struct procstat *ps = &jp->ps[jp->nprocs++];
|
|
ps->ps_pid = pid;
|
|
ps->ps_status = -1;
|
|
ps->ps_cmd = nullstr;
|
|
#if JOBS
|
|
if (doing_jobctl && n)
|
|
ps->ps_cmd = commandtext(n);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* jp and n are NULL when called by openhere() for heredoc support */
|
|
static int
|
|
forkshell(struct job *jp, union node *n, int mode)
|
|
{
|
|
int pid;
|
|
|
|
TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
|
|
pid = fork();
|
|
if (pid < 0) {
|
|
TRACE(("Fork failed, errno=%d", errno));
|
|
if (jp)
|
|
freejob(jp);
|
|
ash_msg_and_raise_perror("can't fork");
|
|
}
|
|
if (pid == 0) {
|
|
CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */
|
|
forkchild(jp, n, mode);
|
|
} else {
|
|
forkparent(jp, n, mode, pid);
|
|
}
|
|
return pid;
|
|
}
|
|
|
|
/*
|
|
* Wait for job to finish.
|
|
*
|
|
* Under job control we have the problem that while a child process
|
|
* is running interrupts generated by the user are sent to the child
|
|
* but not to the shell. This means that an infinite loop started by
|
|
* an interactive user may be hard to kill. With job control turned off,
|
|
* an interactive user may place an interactive program inside a loop.
|
|
* If the interactive program catches interrupts, the user doesn't want
|
|
* these interrupts to also abort the loop. The approach we take here
|
|
* is to have the shell ignore interrupt signals while waiting for a
|
|
* foreground process to terminate, and then send itself an interrupt
|
|
* signal if the child process was terminated by an interrupt signal.
|
|
* Unfortunately, some programs want to do a bit of cleanup and then
|
|
* exit on interrupt; unless these processes terminate themselves by
|
|
* sending a signal to themselves (instead of calling exit) they will
|
|
* confuse this approach.
|
|
*
|
|
* Called with interrupts off.
|
|
*/
|
|
static int
|
|
waitforjob(struct job *jp)
|
|
{
|
|
int st;
|
|
|
|
TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
|
|
|
|
INT_OFF;
|
|
while (jp->state == JOBRUNNING) {
|
|
/* In non-interactive shells, we _can_ get
|
|
* a keyboard signal here and be EINTRed,
|
|
* but we just loop back, waiting for command to complete.
|
|
*
|
|
* man bash:
|
|
* "If bash is waiting for a command to complete and receives
|
|
* a signal for which a trap has been set, the trap
|
|
* will not be executed until the command completes."
|
|
*
|
|
* Reality is that even if trap is not set, bash
|
|
* will not act on the signal until command completes.
|
|
* Try this. sleep5intoff.c:
|
|
* #include <signal.h>
|
|
* #include <unistd.h>
|
|
* int main() {
|
|
* sigset_t set;
|
|
* sigemptyset(&set);
|
|
* sigaddset(&set, SIGINT);
|
|
* sigaddset(&set, SIGQUIT);
|
|
* sigprocmask(SIG_BLOCK, &set, NULL);
|
|
* sleep(5);
|
|
* return 0;
|
|
* }
|
|
* $ bash -c './sleep5intoff; echo hi'
|
|
* ^C^C^C^C <--- pressing ^C once a second
|
|
* $ _
|
|
* $ bash -c './sleep5intoff; echo hi'
|
|
* ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
|
|
* $ _
|
|
*/
|
|
dowait(DOWAIT_BLOCK, jp);
|
|
}
|
|
INT_ON;
|
|
|
|
st = getstatus(jp);
|
|
#if JOBS
|
|
if (jp->jobctl) {
|
|
xtcsetpgrp(ttyfd, rootpid);
|
|
restore_tty_if_stopped_or_signaled(jp);
|
|
|
|
/*
|
|
* This is truly gross.
|
|
* If we're doing job control, then we did a TIOCSPGRP which
|
|
* caused us (the shell) to no longer be in the controlling
|
|
* session -- so we wouldn't have seen any ^C/SIGINT. So, we
|
|
* intuit from the subprocess exit status whether a SIGINT
|
|
* occurred, and if so interrupt ourselves. Yuck. - mycroft
|
|
*/
|
|
if (jp->sigint) /* TODO: do the same with all signals */
|
|
raise(SIGINT); /* ... by raise(jp->sig) instead? */
|
|
}
|
|
if (jp->state == JOBDONE)
|
|
#endif
|
|
freejob(jp);
|
|
return st;
|
|
}
|
|
|
|
/*
|
|
* return 1 if there are stopped jobs, otherwise 0
|
|
*/
|
|
static int
|
|
stoppedjobs(void)
|
|
{
|
|
struct job *jp;
|
|
int retval;
|
|
|
|
retval = 0;
|
|
if (job_warning)
|
|
goto out;
|
|
jp = curjob;
|
|
if (jp && jp->state == JOBSTOPPED) {
|
|
out2str("You have stopped jobs.\n");
|
|
job_warning = 2;
|
|
retval++;
|
|
}
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*
|
|
* Code for dealing with input/output redirection.
|
|
*/
|
|
|
|
#undef EMPTY
|
|
#undef CLOSED
|
|
#define EMPTY -2 /* marks an unused slot in redirtab */
|
|
#define CLOSED -1 /* marks a slot of previously-closed fd */
|
|
|
|
/*
|
|
* Handle here documents. Normally we fork off a process to write the
|
|
* data to a pipe. If the document is short, we can stuff the data in
|
|
* the pipe without forking.
|
|
*/
|
|
/* openhere needs this forward reference */
|
|
static void expandhere(union node *arg, int fd);
|
|
static int
|
|
openhere(union node *redir)
|
|
{
|
|
int pip[2];
|
|
size_t len = 0;
|
|
|
|
if (pipe(pip) < 0)
|
|
ash_msg_and_raise_perror("can't create pipe");
|
|
if (redir->type == NHERE) {
|
|
len = strlen(redir->nhere.doc->narg.text);
|
|
if (len <= PIPE_BUF) {
|
|
full_write(pip[1], redir->nhere.doc->narg.text, len);
|
|
goto out;
|
|
}
|
|
}
|
|
if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
|
|
/* child */
|
|
close(pip[0]);
|
|
ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
|
|
ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
|
|
ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
|
|
ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
|
|
signal(SIGPIPE, SIG_DFL);
|
|
if (redir->type == NHERE)
|
|
full_write(pip[1], redir->nhere.doc->narg.text, len);
|
|
else /* NXHERE */
|
|
expandhere(redir->nhere.doc, pip[1]);
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
out:
|
|
close(pip[1]);
|
|
return pip[0];
|
|
}
|
|
|
|
static int
|
|
openredirect(union node *redir)
|
|
{
|
|
struct stat sb;
|
|
char *fname;
|
|
int f;
|
|
|
|
switch (redir->nfile.type) {
|
|
/* Can't happen, our single caller does this itself */
|
|
// case NTOFD:
|
|
// case NFROMFD:
|
|
// return -1;
|
|
case NHERE:
|
|
case NXHERE:
|
|
return openhere(redir);
|
|
}
|
|
|
|
/* For N[X]HERE, reading redir->nfile.expfname would touch beyond
|
|
* allocated space. Do it only when we know it is safe.
|
|
*/
|
|
fname = redir->nfile.expfname;
|
|
|
|
switch (redir->nfile.type) {
|
|
default:
|
|
#if DEBUG
|
|
abort();
|
|
#endif
|
|
case NFROM:
|
|
f = open(fname, O_RDONLY);
|
|
if (f < 0)
|
|
goto eopen;
|
|
break;
|
|
case NFROMTO:
|
|
f = open(fname, O_RDWR|O_CREAT, 0666);
|
|
if (f < 0)
|
|
goto ecreate;
|
|
break;
|
|
case NTO:
|
|
#if BASH_REDIR_OUTPUT
|
|
case NTO2:
|
|
#endif
|
|
/* Take care of noclobber mode. */
|
|
if (Cflag) {
|
|
if (stat(fname, &sb) < 0) {
|
|
f = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
|
|
if (f < 0)
|
|
goto ecreate;
|
|
} else if (!S_ISREG(sb.st_mode)) {
|
|
f = open(fname, O_WRONLY, 0666);
|
|
if (f < 0)
|
|
goto ecreate;
|
|
if (!fstat(f, &sb) && S_ISREG(sb.st_mode)) {
|
|
close(f);
|
|
errno = EEXIST;
|
|
goto ecreate;
|
|
}
|
|
} else {
|
|
errno = EEXIST;
|
|
goto ecreate;
|
|
}
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case NCLOBBER:
|
|
f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
|
|
if (f < 0)
|
|
goto ecreate;
|
|
break;
|
|
case NAPPEND:
|
|
f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
|
|
if (f < 0)
|
|
goto ecreate;
|
|
break;
|
|
}
|
|
|
|
return f;
|
|
ecreate:
|
|
ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
|
|
eopen:
|
|
ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
|
|
}
|
|
|
|
/*
|
|
* Copy a file descriptor to be >= 10. Throws exception on error.
|
|
*/
|
|
static int
|
|
savefd(int from)
|
|
{
|
|
int newfd;
|
|
int err;
|
|
|
|
newfd = fcntl(from, F_DUPFD_CLOEXEC, 10);
|
|
err = newfd < 0 ? errno : 0;
|
|
if (err != EBADF) {
|
|
if (err)
|
|
ash_msg_and_raise_perror("%d", from);
|
|
close(from);
|
|
if (F_DUPFD_CLOEXEC == F_DUPFD)
|
|
close_on_exec_on(newfd);
|
|
}
|
|
|
|
return newfd;
|
|
}
|
|
static int
|
|
dup2_or_raise(int from, int to)
|
|
{
|
|
int newfd;
|
|
|
|
newfd = (from != to) ? dup2(from, to) : to;
|
|
if (newfd < 0) {
|
|
/* Happens when source fd is not open: try "echo >&99" */
|
|
ash_msg_and_raise_perror("%d", from);
|
|
}
|
|
return newfd;
|
|
}
|
|
static int
|
|
dup_CLOEXEC(int fd, int avoid_fd)
|
|
{
|
|
int newfd;
|
|
repeat:
|
|
newfd = fcntl(fd, F_DUPFD_CLOEXEC, avoid_fd + 1);
|
|
if (newfd >= 0) {
|
|
if (F_DUPFD_CLOEXEC == F_DUPFD) /* if old libc (w/o F_DUPFD_CLOEXEC) */
|
|
close_on_exec_on(newfd);
|
|
} else { /* newfd < 0 */
|
|
if (errno == EBUSY)
|
|
goto repeat;
|
|
if (errno == EINTR)
|
|
goto repeat;
|
|
}
|
|
return newfd;
|
|
}
|
|
static int
|
|
xdup_CLOEXEC_and_close(int fd, int avoid_fd)
|
|
{
|
|
int newfd;
|
|
repeat:
|
|
newfd = fcntl(fd, F_DUPFD_CLOEXEC, avoid_fd + 1);
|
|
if (newfd < 0) {
|
|
if (errno == EBUSY)
|
|
goto repeat;
|
|
if (errno == EINTR)
|
|
goto repeat;
|
|
/* fd was not open? */
|
|
if (errno == EBADF)
|
|
return fd;
|
|
ash_msg_and_raise_perror("%d", newfd);
|
|
}
|
|
if (F_DUPFD_CLOEXEC == F_DUPFD)
|
|
close_on_exec_on(newfd);
|
|
close(fd);
|
|
return newfd;
|
|
}
|
|
|
|
/* Struct def and variable are moved down to the first usage site */
|
|
struct squirrel {
|
|
int orig_fd;
|
|
int moved_to;
|
|
};
|
|
struct redirtab {
|
|
struct redirtab *next;
|
|
int pair_count;
|
|
struct squirrel two_fd[];
|
|
};
|
|
#define redirlist (G_var.redirlist)
|
|
|
|
static void
|
|
add_squirrel_closed(struct redirtab *sq, int fd)
|
|
{
|
|
int i;
|
|
|
|
if (!sq)
|
|
return;
|
|
|
|
for (i = 0; sq->two_fd[i].orig_fd != EMPTY; i++) {
|
|
/* If we collide with an already moved fd... */
|
|
if (fd == sq->two_fd[i].orig_fd) {
|
|
/* Examples:
|
|
* "echo 3>FILE 3>&- 3>FILE"
|
|
* "echo 3>&- 3>FILE"
|
|
* No need for last redirect to insert
|
|
* another "need to close 3" indicator.
|
|
*/
|
|
TRACE(("redirect_fd %d: already moved or closed\n", fd));
|
|
return;
|
|
}
|
|
}
|
|
TRACE(("redirect_fd %d: previous fd was closed\n", fd));
|
|
sq->two_fd[i].orig_fd = fd;
|
|
sq->two_fd[i].moved_to = CLOSED;
|
|
}
|
|
|
|
static int
|
|
save_fd_on_redirect(int fd, int avoid_fd, struct redirtab *sq)
|
|
{
|
|
int i, new_fd;
|
|
|
|
if (avoid_fd < 9) /* the important case here is that it can be -1 */
|
|
avoid_fd = 9;
|
|
|
|
#if JOBS
|
|
if (fd == ttyfd) {
|
|
/* Testcase: "ls -l /proc/$$/fd 10>&-" should work */
|
|
ttyfd = xdup_CLOEXEC_and_close(ttyfd, avoid_fd);
|
|
TRACE(("redirect_fd %d: matches ttyfd, moving it to %d\n", fd, ttyfd));
|
|
return 1; /* "we closed fd" */
|
|
}
|
|
#endif
|
|
/* Are we called from redirect(0)? E.g. redirect
|
|
* in a forked child. No need to save fds,
|
|
* we aren't going to use them anymore, ok to trash.
|
|
*/
|
|
if (!sq)
|
|
return 0;
|
|
|
|
/* If this one of script's fds? */
|
|
if (fd != 0) {
|
|
struct parsefile *pf = g_parsefile;
|
|
while (pf) {
|
|
/* We skip fd == 0 case because of the following:
|
|
* $ ash # running ash interactively
|
|
* $ . ./script.sh
|
|
* and in script.sh: "exec 9>&0".
|
|
* Even though top-level pf_fd _is_ 0,
|
|
* it's still ok to use it: "read" builtin uses it,
|
|
* why should we cripple "exec" builtin?
|
|
*/
|
|
if (fd == pf->pf_fd) {
|
|
pf->pf_fd = xdup_CLOEXEC_and_close(fd, avoid_fd);
|
|
return 1; /* "we closed fd" */
|
|
}
|
|
pf = pf->prev;
|
|
}
|
|
}
|
|
|
|
/* Check whether it collides with any open fds (e.g. stdio), save fds as needed */
|
|
|
|
/* First: do we collide with some already moved fds? */
|
|
for (i = 0; sq->two_fd[i].orig_fd != EMPTY; i++) {
|
|
/* If we collide with an already moved fd... */
|
|
if (fd == sq->two_fd[i].moved_to) {
|
|
new_fd = dup_CLOEXEC(fd, avoid_fd);
|
|
sq->two_fd[i].moved_to = new_fd;
|
|
TRACE(("redirect_fd %d: already busy, moving to %d\n", fd, new_fd));
|
|
if (new_fd < 0) /* what? */
|
|
xfunc_die();
|
|
return 0; /* "we did not close fd" */
|
|
}
|
|
if (fd == sq->two_fd[i].orig_fd) {
|
|
/* Example: echo Hello >/dev/null 1>&2 */
|
|
TRACE(("redirect_fd %d: already moved\n", fd));
|
|
return 0; /* "we did not close fd" */
|
|
}
|
|
}
|
|
|
|
/* If this fd is open, we move and remember it; if it's closed, new_fd = CLOSED (-1) */
|
|
new_fd = dup_CLOEXEC(fd, avoid_fd);
|
|
TRACE(("redirect_fd %d: previous fd is moved to %d (-1 if it was closed)\n", fd, new_fd));
|
|
if (new_fd < 0) {
|
|
if (errno != EBADF)
|
|
xfunc_die();
|
|
/* new_fd = CLOSED; - already is -1 */
|
|
}
|
|
sq->two_fd[i].moved_to = new_fd;
|
|
sq->two_fd[i].orig_fd = fd;
|
|
|
|
/* if we move stderr, let "set -x" code know */
|
|
if (fd == preverrout_fd)
|
|
preverrout_fd = new_fd;
|
|
|
|
return 0; /* "we did not close fd" */
|
|
}
|
|
|
|
static int
|
|
internally_opened_fd(int fd, struct redirtab *sq)
|
|
{
|
|
int i;
|
|
#if JOBS
|
|
if (fd == ttyfd)
|
|
return 1;
|
|
#endif
|
|
/* If this one of script's fds? */
|
|
if (fd != 0) {
|
|
struct parsefile *pf = g_parsefile;
|
|
while (pf) {
|
|
if (fd == pf->pf_fd)
|
|
return 1;
|
|
pf = pf->prev;
|
|
}
|
|
}
|
|
|
|
if (sq) for (i = 0; i < sq->pair_count && sq->two_fd[i].orig_fd != EMPTY; i++) {
|
|
if (fd == sq->two_fd[i].moved_to)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Process a list of redirection commands. If the REDIR_PUSH flag is set,
|
|
* old file descriptors are stashed away so that the redirection can be
|
|
* undone by calling popredir.
|
|
*/
|
|
/* flags passed to redirect */
|
|
#define REDIR_PUSH 01 /* save previous values of file descriptors */
|
|
static void
|
|
redirect(union node *redir, int flags)
|
|
{
|
|
struct redirtab *sv;
|
|
|
|
if (!redir)
|
|
return;
|
|
|
|
sv = NULL;
|
|
INT_OFF;
|
|
if (flags & REDIR_PUSH)
|
|
sv = redirlist;
|
|
do {
|
|
int fd;
|
|
int newfd;
|
|
int close_fd;
|
|
int closed;
|
|
|
|
fd = redir->nfile.fd;
|
|
if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
|
|
//bb_error_msg("doing %d > %d", fd, newfd);
|
|
newfd = redir->ndup.dupfd;
|
|
close_fd = -1;
|
|
} else {
|
|
newfd = openredirect(redir); /* always >= 0 */
|
|
if (fd == newfd) {
|
|
/* open() gave us precisely the fd we wanted.
|
|
* This means that this fd was not busy
|
|
* (not opened to anywhere).
|
|
* Remember to close it on restore:
|
|
*/
|
|
add_squirrel_closed(sv, fd);
|
|
continue;
|
|
}
|
|
close_fd = newfd;
|
|
}
|
|
|
|
if (fd == newfd)
|
|
continue;
|
|
|
|
/* if "N>FILE": move newfd to fd */
|
|
/* if "N>&M": dup newfd to fd */
|
|
/* if "N>&-": close fd (newfd is -1) */
|
|
|
|
IF_BASH_REDIR_OUTPUT(redirect_more:)
|
|
|
|
closed = save_fd_on_redirect(fd, /*avoid:*/ newfd, sv);
|
|
if (newfd == -1) {
|
|
/* "N>&-" means "close me" */
|
|
if (!closed) {
|
|
/* ^^^ optimization: saving may already
|
|
* have closed it. If not... */
|
|
close(fd);
|
|
}
|
|
} else {
|
|
/* if newfd is a script fd or saved fd, simulate EBADF */
|
|
if (internally_opened_fd(newfd, sv)) {
|
|
errno = EBADF;
|
|
ash_msg_and_raise_perror("%d", newfd);
|
|
}
|
|
dup2_or_raise(newfd, fd);
|
|
if (close_fd >= 0) /* "N>FILE" or ">&FILE" or heredoc? */
|
|
close(close_fd);
|
|
#if BASH_REDIR_OUTPUT
|
|
if (redir->nfile.type == NTO2 && fd == 1) {
|
|
/* ">&FILE". we already redirected to 1, now copy 1 to 2 */
|
|
fd = 2;
|
|
newfd = 1;
|
|
close_fd = -1;
|
|
goto redirect_more;
|
|
}
|
|
#endif
|
|
}
|
|
} while ((redir = redir->nfile.next) != NULL);
|
|
INT_ON;
|
|
|
|
//dash:#define REDIR_SAVEFD2 03 /* set preverrout */
|
|
#define REDIR_SAVEFD2 0
|
|
// dash has a bug: since REDIR_SAVEFD2=3 and REDIR_PUSH=1, this test
|
|
// triggers for pure REDIR_PUSH too. Thus, this is done almost always,
|
|
// not only for calls with flags containing REDIR_SAVEFD2.
|
|
// We do this unconditionally (see save_fd_on_redirect()).
|
|
//if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
|
|
// preverrout_fd = copied_fd2;
|
|
}
|
|
|
|
static int
|
|
redirectsafe(union node *redir, int flags)
|
|
{
|
|
int err;
|
|
volatile int saveint;
|
|
struct jmploc *volatile savehandler = exception_handler;
|
|
struct jmploc jmploc;
|
|
|
|
SAVE_INT(saveint);
|
|
/* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
|
|
err = setjmp(jmploc.loc); /* was = setjmp(jmploc.loc) * 2; */
|
|
if (!err) {
|
|
exception_handler = &jmploc;
|
|
redirect(redir, flags);
|
|
}
|
|
exception_handler = savehandler;
|
|
if (err && exception_type != EXERROR)
|
|
longjmp(exception_handler->loc, 1);
|
|
RESTORE_INT(saveint);
|
|
return err;
|
|
}
|
|
|
|
static struct redirtab*
|
|
pushredir(union node *redir)
|
|
{
|
|
struct redirtab *sv;
|
|
int i;
|
|
|
|
if (!redir)
|
|
return redirlist;
|
|
|
|
i = 0;
|
|
do {
|
|
i++;
|
|
#if BASH_REDIR_OUTPUT
|
|
if (redir->nfile.type == NTO2)
|
|
i++;
|
|
#endif
|
|
redir = redir->nfile.next;
|
|
} while (redir);
|
|
|
|
sv = ckzalloc(sizeof(*sv) + i * sizeof(sv->two_fd[0]));
|
|
sv->pair_count = i;
|
|
while (--i >= 0)
|
|
sv->two_fd[i].orig_fd = sv->two_fd[i].moved_to = EMPTY;
|
|
sv->next = redirlist;
|
|
redirlist = sv;
|
|
return sv->next;
|
|
}
|
|
|
|
/*
|
|
* Undo the effects of the last redirection.
|
|
*/
|
|
static void
|
|
popredir(int drop)
|
|
{
|
|
struct redirtab *rp;
|
|
int i;
|
|
|
|
if (redirlist == NULL)
|
|
return;
|
|
INT_OFF;
|
|
rp = redirlist;
|
|
for (i = 0; i < rp->pair_count; i++) {
|
|
int fd = rp->two_fd[i].orig_fd;
|
|
int copy = rp->two_fd[i].moved_to;
|
|
if (copy == CLOSED) {
|
|
if (!drop)
|
|
close(fd);
|
|
continue;
|
|
}
|
|
if (copy != EMPTY) {
|
|
if (!drop) {
|
|
/*close(fd);*/
|
|
dup2_or_raise(copy, fd);
|
|
}
|
|
close(copy);
|
|
}
|
|
}
|
|
redirlist = rp->next;
|
|
free(rp);
|
|
INT_ON;
|
|
}
|
|
|
|
static void
|
|
unwindredir(struct redirtab *stop)
|
|
{
|
|
while (redirlist != stop)
|
|
popredir(/*drop:*/ 0);
|
|
}
|
|
|
|
|
|
/* ============ Routines to expand arguments to commands
|
|
*
|
|
* We have to deal with backquotes, shell variables, and file metacharacters.
|
|
*/
|
|
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
static arith_t
|
|
ash_arith(const char *s)
|
|
{
|
|
arith_state_t math_state;
|
|
arith_t result;
|
|
|
|
math_state.lookupvar = lookupvar;
|
|
math_state.setvar = setvar0;
|
|
//math_state.endofname = endofname;
|
|
|
|
INT_OFF;
|
|
result = arith(&math_state, s);
|
|
if (math_state.errmsg)
|
|
ash_msg_and_raise_error(math_state.errmsg);
|
|
INT_ON;
|
|
|
|
return result;
|
|
}
|
|
#endif
|
|
#if BASH_SUBSTR
|
|
# if ENABLE_FEATURE_SH_MATH
|
|
static int substr_atoi(const char *s)
|
|
{
|
|
arith_t t = ash_arith(s);
|
|
if (sizeof(t) > sizeof(int)) {
|
|
/* clamp very large or very large negative nums for ${v:N:M}:
|
|
* else "${v:0:0x100000001}" would work as "${v:0:1}"
|
|
*/
|
|
if (t > INT_MAX)
|
|
t = INT_MAX;
|
|
if (t < INT_MIN)
|
|
t = INT_MIN;
|
|
}
|
|
return t;
|
|
}
|
|
# else
|
|
# define substr_atoi(s) number(s)
|
|
# endif
|
|
#endif
|
|
|
|
/*
|
|
* expandarg flags
|
|
*/
|
|
#define EXP_FULL 0x1 /* perform word splitting & file globbing */
|
|
#define EXP_TILDE 0x2 /* do normal tilde expansion */
|
|
#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
|
|
#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
|
|
/* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt"
|
|
* POSIX says for this case:
|
|
* Pathname expansion shall not be performed on the word by a
|
|
* non-interactive shell; an interactive shell may perform it, but shall
|
|
* do so only when the expansion would result in one word.
|
|
* Currently, our code complies to the above rule by never globbing
|
|
* redirection filenames.
|
|
* Bash performs globbing, unless it is non-interactive and in POSIX mode.
|
|
* (this means that on a typical Linux distro, bash almost always
|
|
* performs globbing, and thus diverges from what we do).
|
|
*/
|
|
#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
|
|
#define EXP_VARTILDE2 0x20 /* expand tildes after colons only */
|
|
#define EXP_WORD 0x40 /* expand word in parameter expansion */
|
|
#define EXP_QUOTED 0x100 /* expand word in double quotes */
|
|
/*
|
|
* rmescape() flags
|
|
*/
|
|
#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
|
|
#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
|
|
#define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
|
|
#define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
|
|
|
|
/* Add CTLESC when necessary. */
|
|
#define QUOTES_ESC (EXP_FULL | EXP_CASE)
|
|
/* Do not skip NUL characters. */
|
|
#define QUOTES_KEEPNUL EXP_TILDE
|
|
|
|
/*
|
|
* Structure specifying which parts of the string should be searched
|
|
* for IFS characters.
|
|
*/
|
|
struct ifsregion {
|
|
struct ifsregion *next; /* next region in list */
|
|
int begoff; /* offset of start of region */
|
|
int endoff; /* offset of end of region */
|
|
int nulonly; /* search for nul bytes only */
|
|
};
|
|
|
|
struct arglist {
|
|
struct strlist *list;
|
|
struct strlist **lastp;
|
|
};
|
|
|
|
/* output of current string */
|
|
static char *expdest;
|
|
/* list of back quote expressions */
|
|
static struct nodelist *argbackq;
|
|
/* first struct in list of ifs regions */
|
|
static struct ifsregion ifsfirst;
|
|
/* last struct in list */
|
|
static struct ifsregion *ifslastp;
|
|
/* holds expanded arg list */
|
|
static struct arglist exparg;
|
|
|
|
/*
|
|
* Our own itoa().
|
|
* cvtnum() is used even if math support is off (to prepare $? values and such).
|
|
*/
|
|
static int
|
|
cvtnum(arith_t num)
|
|
{
|
|
int len;
|
|
|
|
/* 32-bit and wider ints require buffer size of bytes*3 (or less) */
|
|
len = sizeof(arith_t) * 3;
|
|
/* If narrower: worst case, 1-byte ints: need 5 bytes: "-127<NUL>" */
|
|
if (sizeof(arith_t) < 4) len += 2;
|
|
|
|
expdest = makestrspace(len, expdest);
|
|
len = fmtstr(expdest, len, ARITH_FMT, num);
|
|
STADJUST(len, expdest);
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Break the argument string into pieces based upon IFS and add the
|
|
* strings to the argument list. The regions of the string to be
|
|
* searched for IFS characters have been stored by recordregion.
|
|
*/
|
|
static void
|
|
ifsbreakup(char *string, struct arglist *arglist)
|
|
{
|
|
struct ifsregion *ifsp;
|
|
struct strlist *sp;
|
|
char *start;
|
|
char *p;
|
|
char *q;
|
|
const char *ifs, *realifs;
|
|
int ifsspc;
|
|
int nulonly;
|
|
|
|
start = string;
|
|
if (ifslastp != NULL) {
|
|
ifsspc = 0;
|
|
nulonly = 0;
|
|
realifs = ifsset() ? ifsval() : defifs;
|
|
ifsp = &ifsfirst;
|
|
do {
|
|
int afternul;
|
|
|
|
p = string + ifsp->begoff;
|
|
afternul = nulonly;
|
|
nulonly = ifsp->nulonly;
|
|
ifs = nulonly ? nullstr : realifs;
|
|
ifsspc = 0;
|
|
while (p < string + ifsp->endoff) {
|
|
q = p;
|
|
if ((unsigned char)*p == CTLESC)
|
|
p++;
|
|
if (!strchr(ifs, *p)) {
|
|
p++;
|
|
continue;
|
|
}
|
|
if (!(afternul || nulonly))
|
|
ifsspc = (strchr(defifs, *p) != NULL);
|
|
/* Ignore IFS whitespace at start */
|
|
if (q == start && ifsspc) {
|
|
p++;
|
|
start = p;
|
|
continue;
|
|
}
|
|
*q = '\0';
|
|
sp = stzalloc(sizeof(*sp));
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
p++;
|
|
if (!nulonly) {
|
|
for (;;) {
|
|
if (p >= string + ifsp->endoff) {
|
|
break;
|
|
}
|
|
q = p;
|
|
if ((unsigned char)*p == CTLESC)
|
|
p++;
|
|
if (strchr(ifs, *p) == NULL) {
|
|
p = q;
|
|
break;
|
|
}
|
|
if (strchr(defifs, *p) == NULL) {
|
|
if (ifsspc) {
|
|
p++;
|
|
ifsspc = 0;
|
|
} else {
|
|
p = q;
|
|
break;
|
|
}
|
|
} else
|
|
p++;
|
|
}
|
|
}
|
|
start = p;
|
|
} /* while */
|
|
ifsp = ifsp->next;
|
|
} while (ifsp != NULL);
|
|
if (nulonly)
|
|
goto add;
|
|
}
|
|
|
|
if (!*start)
|
|
return;
|
|
|
|
add:
|
|
sp = stzalloc(sizeof(*sp));
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
}
|
|
|
|
static void
|
|
ifsfree(void)
|
|
{
|
|
struct ifsregion *p = ifsfirst.next;
|
|
|
|
if (!p)
|
|
goto out;
|
|
|
|
INT_OFF;
|
|
do {
|
|
struct ifsregion *ifsp;
|
|
ifsp = p->next;
|
|
free(p);
|
|
p = ifsp;
|
|
} while (p);
|
|
ifsfirst.next = NULL;
|
|
INT_ON;
|
|
out:
|
|
ifslastp = NULL;
|
|
}
|
|
|
|
static size_t
|
|
esclen(const char *start, const char *p)
|
|
{
|
|
size_t esc = 0;
|
|
|
|
while (p > start && (unsigned char)*--p == CTLESC) {
|
|
esc++;
|
|
}
|
|
return esc;
|
|
}
|
|
|
|
/*
|
|
* Remove any CTLESC characters from a string.
|
|
*/
|
|
#if !BASH_PATTERN_SUBST
|
|
#define rmescapes(str, flag, slash_position) \
|
|
rmescapes(str, flag)
|
|
#endif
|
|
static char *
|
|
rmescapes(char *str, int flag, int *slash_position)
|
|
{
|
|
static const char qchars[] ALIGN1 = {
|
|
IF_BASH_PATTERN_SUBST('/',) CTLESC, CTLQUOTEMARK, '\0' };
|
|
|
|
char *p, *q, *r;
|
|
unsigned protect_against_glob;
|
|
unsigned globbing;
|
|
|
|
p = strpbrk(str, qchars IF_BASH_PATTERN_SUBST(+ !slash_position));
|
|
if (!p)
|
|
return str;
|
|
|
|
q = p;
|
|
r = str;
|
|
if (flag & RMESCAPE_ALLOC) {
|
|
size_t len = p - str;
|
|
size_t fulllen = len + strlen(p) + 1;
|
|
|
|
if (flag & RMESCAPE_GROW) {
|
|
int strloc = str - (char *)stackblock();
|
|
r = makestrspace(fulllen, expdest);
|
|
/* p and str may be invalidated by makestrspace */
|
|
str = (char *)stackblock() + strloc;
|
|
p = str + len;
|
|
} else if (flag & RMESCAPE_HEAP) {
|
|
r = ckmalloc(fulllen);
|
|
} else {
|
|
r = stalloc(fulllen);
|
|
}
|
|
q = r;
|
|
if (len > 0) {
|
|
q = (char *)mempcpy(q, str, len);
|
|
}
|
|
}
|
|
|
|
globbing = flag & RMESCAPE_GLOB;
|
|
protect_against_glob = globbing;
|
|
while (*p) {
|
|
if ((unsigned char)*p == CTLQUOTEMARK) {
|
|
// Note: protect_against_glob only affect whether
|
|
// CTLESC,<ch> gets converted to <ch> or to \<ch>
|
|
p++;
|
|
protect_against_glob = globbing;
|
|
continue;
|
|
}
|
|
if (*p == '\\') {
|
|
/* naked back slash */
|
|
protect_against_glob = 0;
|
|
goto copy;
|
|
}
|
|
if ((unsigned char)*p == CTLESC) {
|
|
p++;
|
|
#if DEBUG
|
|
if (*p == '\0')
|
|
ash_msg_and_raise_error("CTLESC at EOL (shouldn't happen)");
|
|
#endif
|
|
if (protect_against_glob) {
|
|
/*
|
|
* We used to trust glob() and fnmatch() to eat
|
|
* superfluous escapes (\z where z has no
|
|
* special meaning anyway). But this causes
|
|
* bugs such as string of one greek letter rho
|
|
* (unicode-encoded as two bytes "cf,81")
|
|
* getting encoded as "cf,CTLESC,81"
|
|
* and here, converted to "cf,\,81" -
|
|
* which does not go well with some flavors
|
|
* of fnmatch() in unicode locales
|
|
* (for example, glibc <= 2.22).
|
|
*
|
|
* Lets add "\" only on the chars which need it.
|
|
* Testcases for less obvious chars are shown.
|
|
*/
|
|
if (*p == '*'
|
|
|| *p == '?'
|
|
|| *p == '['
|
|
|| *p == '\\' /* case '\' in \\ ) echo ok;; *) echo WRONG;; esac */
|
|
|| *p == ']' /* case ']' in [a\]] ) echo ok;; *) echo WRONG;; esac */
|
|
|| *p == '-' /* case '-' in [a\-c]) echo ok;; *) echo WRONG;; esac */
|
|
|| *p == '!' /* case '!' in [\!] ) echo ok;; *) echo WRONG;; esac */
|
|
/* Some libc support [^negate], that's why "^" also needs love */
|
|
|| *p == '^' /* case '^' in [\^] ) echo ok;; *) echo WRONG;; esac */
|
|
) {
|
|
*q++ = '\\';
|
|
}
|
|
}
|
|
}
|
|
#if BASH_PATTERN_SUBST
|
|
else if (slash_position && p == str + *slash_position) {
|
|
/* stop handling globbing */
|
|
globbing = 0;
|
|
*slash_position = q - r;
|
|
slash_position = NULL;
|
|
}
|
|
#endif
|
|
protect_against_glob = globbing;
|
|
copy:
|
|
*q++ = *p++;
|
|
}
|
|
*q = '\0';
|
|
if (flag & RMESCAPE_GROW) {
|
|
expdest = r;
|
|
STADJUST(q - r + 1, expdest);
|
|
}
|
|
return r;
|
|
}
|
|
#define pmatch(a, b) !fnmatch((a), (b), 0)
|
|
|
|
/*
|
|
* Prepare a pattern for a expmeta (internal glob(3)) call.
|
|
*
|
|
* Returns an stalloced string.
|
|
*/
|
|
static char *
|
|
preglob(const char *pattern, int flag)
|
|
{
|
|
return rmescapes((char *)pattern, flag | RMESCAPE_GLOB, NULL);
|
|
}
|
|
|
|
/*
|
|
* Put a string on the stack.
|
|
*/
|
|
static void
|
|
memtodest(const char *p, size_t len, int syntax, int quotes)
|
|
{
|
|
char *q;
|
|
|
|
if (!len)
|
|
return;
|
|
|
|
q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest);
|
|
|
|
do {
|
|
unsigned char c = *p++;
|
|
if (c) {
|
|
if (quotes & QUOTES_ESC) {
|
|
int n = SIT(c, syntax);
|
|
if (n == CCTL
|
|
|| (syntax != BASESYNTAX && n == CBACK)
|
|
) {
|
|
USTPUTC(CTLESC, q);
|
|
}
|
|
}
|
|
} else if (!(quotes & QUOTES_KEEPNUL))
|
|
continue;
|
|
USTPUTC(c, q);
|
|
} while (--len);
|
|
|
|
expdest = q;
|
|
}
|
|
|
|
static size_t
|
|
strtodest(const char *p, int syntax, int quotes)
|
|
{
|
|
size_t len = strlen(p);
|
|
memtodest(p, len, syntax, quotes);
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Record the fact that we have to scan this region of the
|
|
* string for IFS characters.
|
|
*/
|
|
static void
|
|
recordregion(int start, int end, int nulonly)
|
|
{
|
|
struct ifsregion *ifsp;
|
|
|
|
if (ifslastp == NULL) {
|
|
ifsp = &ifsfirst;
|
|
} else {
|
|
INT_OFF;
|
|
ifsp = ckzalloc(sizeof(*ifsp));
|
|
/*ifsp->next = NULL; - ckzalloc did it */
|
|
ifslastp->next = ifsp;
|
|
INT_ON;
|
|
}
|
|
ifslastp = ifsp;
|
|
ifslastp->begoff = start;
|
|
ifslastp->endoff = end;
|
|
ifslastp->nulonly = nulonly;
|
|
}
|
|
|
|
static void
|
|
removerecordregions(int endoff)
|
|
{
|
|
if (ifslastp == NULL)
|
|
return;
|
|
|
|
if (ifsfirst.endoff > endoff) {
|
|
while (ifsfirst.next) {
|
|
struct ifsregion *ifsp;
|
|
INT_OFF;
|
|
ifsp = ifsfirst.next->next;
|
|
free(ifsfirst.next);
|
|
ifsfirst.next = ifsp;
|
|
INT_ON;
|
|
}
|
|
if (ifsfirst.begoff > endoff) {
|
|
ifslastp = NULL;
|
|
} else {
|
|
ifslastp = &ifsfirst;
|
|
ifsfirst.endoff = endoff;
|
|
}
|
|
return;
|
|
}
|
|
|
|
ifslastp = &ifsfirst;
|
|
while (ifslastp->next && ifslastp->next->begoff < endoff)
|
|
ifslastp = ifslastp->next;
|
|
while (ifslastp->next) {
|
|
struct ifsregion *ifsp;
|
|
INT_OFF;
|
|
ifsp = ifslastp->next->next;
|
|
free(ifslastp->next);
|
|
ifslastp->next = ifsp;
|
|
INT_ON;
|
|
}
|
|
if (ifslastp->endoff > endoff)
|
|
ifslastp->endoff = endoff;
|
|
}
|
|
|
|
static char *
|
|
exptilde(char *startp, char *p, int flags)
|
|
{
|
|
unsigned char c;
|
|
char *name;
|
|
struct passwd *pw;
|
|
const char *home;
|
|
int quotes = flags & QUOTES_ESC;
|
|
|
|
name = p + 1;
|
|
|
|
while ((c = *++p) != '\0') {
|
|
switch (c) {
|
|
case CTLESC:
|
|
return startp;
|
|
case CTLQUOTEMARK:
|
|
return startp;
|
|
case ':':
|
|
if (flags & EXP_VARTILDE)
|
|
goto done;
|
|
break;
|
|
case '/':
|
|
case CTLENDVAR:
|
|
goto done;
|
|
}
|
|
}
|
|
done:
|
|
*p = '\0';
|
|
if (*name == '\0') {
|
|
home = lookupvar("HOME");
|
|
} else {
|
|
pw = getpwnam(name);
|
|
if (pw == NULL)
|
|
goto lose;
|
|
home = pw->pw_dir;
|
|
}
|
|
if (!home || !*home)
|
|
goto lose;
|
|
*p = c;
|
|
strtodest(home, SQSYNTAX, quotes);
|
|
return p;
|
|
lose:
|
|
*p = c;
|
|
return startp;
|
|
}
|
|
|
|
/*
|
|
* Execute a command inside back quotes. If it's a builtin command, we
|
|
* want to save its output in a block obtained from malloc. Otherwise
|
|
* we fork off a subprocess and get the output of the command via a pipe.
|
|
* Should be called with interrupts off.
|
|
*/
|
|
struct backcmd { /* result of evalbackcmd */
|
|
int fd; /* file descriptor to read from */
|
|
int nleft; /* number of chars in buffer */
|
|
char *buf; /* buffer */
|
|
struct job *jp; /* job structure for command */
|
|
};
|
|
|
|
/* These forward decls are needed to use "eval" code for backticks handling: */
|
|
/* flags in argument to evaltree */
|
|
#define EV_EXIT 01 /* exit after evaluating tree */
|
|
#define EV_TESTED 02 /* exit status is checked; ignore -e flag */
|
|
static int evaltree(union node *, int);
|
|
|
|
/* An evaltree() which is known to never return.
|
|
* Used to use an alias:
|
|
* static int evaltreenr(union node *, int) __attribute__((alias("evaltree"),__noreturn__));
|
|
* but clang was reported to "transfer" noreturn-ness to evaltree() as well.
|
|
*/
|
|
static ALWAYS_INLINE NORETURN void
|
|
evaltreenr(union node *n, int flags)
|
|
{
|
|
evaltree(n, flags);
|
|
bb_unreachable(abort());
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void FAST_FUNC
|
|
evalbackcmd(union node *n, struct backcmd *result)
|
|
{
|
|
int pip[2];
|
|
struct job *jp;
|
|
|
|
result->fd = -1;
|
|
result->buf = NULL;
|
|
result->nleft = 0;
|
|
result->jp = NULL;
|
|
if (n == NULL) {
|
|
goto out;
|
|
}
|
|
|
|
if (pipe(pip) < 0)
|
|
ash_msg_and_raise_perror("can't create pipe");
|
|
jp = makejob(/*n,*/ 1);
|
|
if (forkshell(jp, n, FORK_NOJOB) == 0) {
|
|
/* child */
|
|
FORCE_INT_ON;
|
|
close(pip[0]);
|
|
if (pip[1] != 1) {
|
|
/*close(1);*/
|
|
dup2_or_raise(pip[1], 1);
|
|
close(pip[1]);
|
|
}
|
|
/* TODO: eflag clearing makes the following not abort:
|
|
* ash -c 'set -e; z=$(false;echo foo); echo $z'
|
|
* which is what bash does (unless it is in POSIX mode).
|
|
* dash deleted "eflag = 0" line in the commit
|
|
* Date: Mon, 28 Jun 2010 17:11:58 +1000
|
|
* [EVAL] Don't clear eflag in evalbackcmd
|
|
* For now, preserve bash-like behavior, it seems to be somewhat more useful:
|
|
*/
|
|
eflag = 0;
|
|
ifsfree();
|
|
evaltreenr(n, EV_EXIT);
|
|
/* NOTREACHED */
|
|
}
|
|
/* parent */
|
|
close(pip[1]);
|
|
result->fd = pip[0];
|
|
result->jp = jp;
|
|
|
|
out:
|
|
TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
|
|
result->fd, result->buf, result->nleft, result->jp));
|
|
}
|
|
|
|
/*
|
|
* Expand stuff in backwards quotes.
|
|
*/
|
|
static void
|
|
expbackq(union node *cmd, int flag)
|
|
{
|
|
struct backcmd in;
|
|
int i;
|
|
char buf[128];
|
|
char *p;
|
|
char *dest;
|
|
int startloc;
|
|
int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX;
|
|
struct stackmark smark;
|
|
|
|
INT_OFF;
|
|
startloc = expdest - (char *)stackblock();
|
|
pushstackmark(&smark, startloc);
|
|
evalbackcmd(cmd, &in);
|
|
popstackmark(&smark);
|
|
|
|
p = in.buf;
|
|
i = in.nleft;
|
|
if (i == 0)
|
|
goto read;
|
|
for (;;) {
|
|
memtodest(p, i, syntax, flag & QUOTES_ESC);
|
|
read:
|
|
if (in.fd < 0)
|
|
break;
|
|
i = nonblock_immune_read(in.fd, buf, sizeof(buf));
|
|
TRACE(("expbackq: read returns %d\n", i));
|
|
if (i <= 0)
|
|
break;
|
|
p = buf;
|
|
}
|
|
|
|
free(in.buf);
|
|
if (in.fd >= 0) {
|
|
close(in.fd);
|
|
back_exitstatus = waitforjob(in.jp);
|
|
}
|
|
INT_ON;
|
|
|
|
/* Eat all trailing newlines */
|
|
dest = expdest;
|
|
for (; dest > (char *)stackblock() && dest[-1] == '\n';)
|
|
STUNPUTC(dest);
|
|
expdest = dest;
|
|
|
|
if (!(flag & EXP_QUOTED))
|
|
recordregion(startloc, dest - (char *)stackblock(), 0);
|
|
TRACE(("evalbackq: size:%d:'%.*s'\n",
|
|
(int)((dest - (char *)stackblock()) - startloc),
|
|
(int)((dest - (char *)stackblock()) - startloc),
|
|
stackblock() + startloc));
|
|
}
|
|
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
/*
|
|
* Expand arithmetic expression. Backup to start of expression,
|
|
* evaluate, place result in (backed up) result, adjust string position.
|
|
*/
|
|
static void
|
|
expari(int flag)
|
|
{
|
|
char *p, *start;
|
|
int begoff;
|
|
int len;
|
|
|
|
/* ifsfree(); */
|
|
|
|
/*
|
|
* This routine is slightly over-complicated for
|
|
* efficiency. Next we scan backwards looking for the
|
|
* start of arithmetic.
|
|
*/
|
|
start = stackblock();
|
|
p = expdest - 1;
|
|
*p = '\0';
|
|
p--;
|
|
while (1) {
|
|
int esc;
|
|
|
|
while ((unsigned char)*p != CTLARI) {
|
|
p--;
|
|
#if DEBUG
|
|
if (p < start) {
|
|
ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
|
|
}
|
|
#endif
|
|
}
|
|
|
|
esc = esclen(start, p);
|
|
if (!(esc % 2)) {
|
|
break;
|
|
}
|
|
|
|
p -= esc + 1;
|
|
}
|
|
|
|
begoff = p - start;
|
|
|
|
removerecordregions(begoff);
|
|
|
|
expdest = p;
|
|
|
|
if (flag & QUOTES_ESC)
|
|
rmescapes(p + 1, 0, NULL);
|
|
|
|
len = cvtnum(ash_arith(p + 1));
|
|
|
|
if (!(flag & EXP_QUOTED))
|
|
recordregion(begoff, begoff + len, 0);
|
|
}
|
|
#endif
|
|
|
|
/* argstr needs it */
|
|
static char *evalvar(char *p, int flags);
|
|
|
|
/*
|
|
* Perform variable and command substitution. If EXP_FULL is set, output CTLESC
|
|
* characters to allow for further processing. Otherwise treat
|
|
* $@ like $* since no splitting will be performed.
|
|
*/
|
|
static void
|
|
argstr(char *p, int flags)
|
|
{
|
|
static const char spclchars[] ALIGN1 = {
|
|
'=',
|
|
':',
|
|
CTLQUOTEMARK,
|
|
CTLENDVAR,
|
|
CTLESC,
|
|
CTLVAR,
|
|
CTLBACKQ,
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
CTLENDARI,
|
|
#endif
|
|
'\0'
|
|
};
|
|
const char *reject = spclchars;
|
|
int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD;
|
|
int inquotes;
|
|
size_t length;
|
|
int startloc;
|
|
|
|
if (!(flags & EXP_VARTILDE)) {
|
|
reject += 2;
|
|
} else if (flags & EXP_VARTILDE2) {
|
|
reject++;
|
|
}
|
|
inquotes = 0;
|
|
length = 0;
|
|
if (flags & EXP_TILDE) {
|
|
char *q;
|
|
|
|
flags &= ~EXP_TILDE;
|
|
tilde:
|
|
q = p;
|
|
if (*q == '~')
|
|
p = exptilde(p, q, flags);
|
|
}
|
|
start:
|
|
startloc = expdest - (char *)stackblock();
|
|
for (;;) {
|
|
unsigned char c;
|
|
|
|
length += strcspn(p + length, reject);
|
|
c = p[length];
|
|
if (c) {
|
|
if (!(c & 0x80)
|
|
IF_FEATURE_SH_MATH(|| c == CTLENDARI)
|
|
) {
|
|
/* c == '=' || c == ':' || c == CTLENDARI */
|
|
length++;
|
|
}
|
|
}
|
|
if (length > 0) {
|
|
int newloc;
|
|
expdest = stack_nputstr(p, length, expdest);
|
|
newloc = expdest - (char *)stackblock();
|
|
if (breakall && !inquotes && newloc > startloc) {
|
|
recordregion(startloc, newloc, 0);
|
|
}
|
|
startloc = newloc;
|
|
}
|
|
p += length + 1;
|
|
length = 0;
|
|
|
|
switch (c) {
|
|
case '\0':
|
|
goto breakloop;
|
|
case '=':
|
|
if (flags & EXP_VARTILDE2) {
|
|
p--;
|
|
continue;
|
|
}
|
|
flags |= EXP_VARTILDE2;
|
|
reject++;
|
|
/* fall through */
|
|
case ':':
|
|
/*
|
|
* sort of a hack - expand tildes in variable
|
|
* assignments (after the first '=' and after ':'s).
|
|
*/
|
|
if (*--p == '~') {
|
|
goto tilde;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
switch (c) {
|
|
case CTLENDVAR: /* ??? */
|
|
goto breakloop;
|
|
case CTLQUOTEMARK:
|
|
/* "$@" syntax adherence hack */
|
|
if (!inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) {
|
|
p = evalvar(p + 1, flags | EXP_QUOTED) + 1;
|
|
goto start;
|
|
}
|
|
inquotes ^= EXP_QUOTED;
|
|
addquote:
|
|
if (flags & QUOTES_ESC) {
|
|
p--;
|
|
length++;
|
|
startloc++;
|
|
}
|
|
break;
|
|
case CTLESC:
|
|
startloc++;
|
|
length++;
|
|
goto addquote;
|
|
case CTLVAR:
|
|
TRACE(("argstr: evalvar('%s')\n", p));
|
|
p = evalvar(p, flags | inquotes);
|
|
TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
|
|
goto start;
|
|
case CTLBACKQ:
|
|
expbackq(argbackq->n, flags | inquotes);
|
|
argbackq = argbackq->next;
|
|
goto start;
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
case CTLENDARI:
|
|
p--;
|
|
expari(flags | inquotes);
|
|
goto start;
|
|
#endif
|
|
}
|
|
}
|
|
breakloop: ;
|
|
}
|
|
|
|
static char *
|
|
scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
|
|
char *pattern, int quotes, int zero)
|
|
{
|
|
char *loc, *loc2;
|
|
char c;
|
|
|
|
loc = startp;
|
|
loc2 = rmesc;
|
|
do {
|
|
int match;
|
|
const char *s = loc2;
|
|
|
|
c = *loc2;
|
|
if (zero) {
|
|
*loc2 = '\0';
|
|
s = rmesc;
|
|
}
|
|
match = pmatch(pattern, s);
|
|
|
|
*loc2 = c;
|
|
if (match)
|
|
return loc;
|
|
if (quotes && (unsigned char)*loc == CTLESC)
|
|
loc++;
|
|
loc++;
|
|
loc2++;
|
|
} while (c);
|
|
return NULL;
|
|
}
|
|
|
|
static char *
|
|
scanright(char *startp, char *rmesc, char *rmescend,
|
|
char *pattern, int quotes, int match_at_start)
|
|
{
|
|
#if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
|
|
int try2optimize = match_at_start;
|
|
#endif
|
|
int esc = 0;
|
|
char *loc;
|
|
char *loc2;
|
|
|
|
/* If we called by "${v/pattern/repl}" or "${v//pattern/repl}":
|
|
* startp="escaped_value_of_v" rmesc="raw_value_of_v"
|
|
* rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1
|
|
* Logic:
|
|
* loc starts at NUL at the end of startp, loc2 starts at the end of rmesc,
|
|
* and on each iteration they go back two/one char until they reach the beginning.
|
|
* We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc.
|
|
*/
|
|
/* TODO: document in what other circumstances we are called. */
|
|
|
|
for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) {
|
|
int match;
|
|
char c = *loc2;
|
|
const char *s = loc2;
|
|
if (match_at_start) {
|
|
*loc2 = '\0';
|
|
s = rmesc;
|
|
}
|
|
match = pmatch(pattern, s);
|
|
//bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match);
|
|
*loc2 = c;
|
|
if (match)
|
|
return loc;
|
|
#if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
|
|
if (try2optimize) {
|
|
/* Maybe we can optimize this:
|
|
* if pattern ends with unescaped *, we can avoid checking
|
|
* shorter strings: if "foo*" doesn't match "raw_value_of_v",
|
|
* it won't match truncated "raw_value_of_" strings too.
|
|
*/
|
|
unsigned plen = strlen(pattern);
|
|
/* Does it end with "*"? */
|
|
if (plen != 0 && pattern[--plen] == '*') {
|
|
/* "xxxx*" is not escaped */
|
|
/* "xxx\*" is escaped */
|
|
/* "xx\\*" is not escaped */
|
|
/* "x\\\*" is escaped */
|
|
int slashes = 0;
|
|
while (plen != 0 && pattern[--plen] == '\\')
|
|
slashes++;
|
|
if (!(slashes & 1))
|
|
break; /* ends with unescaped "*" */
|
|
}
|
|
try2optimize = 0;
|
|
}
|
|
#endif
|
|
loc--;
|
|
if (quotes) {
|
|
if (--esc < 0) {
|
|
esc = esclen(startp, loc);
|
|
}
|
|
if (esc % 2) {
|
|
esc--;
|
|
loc--;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void varunset(const char *, const char *, const char *, int) NORETURN;
|
|
static void
|
|
varunset(const char *end, const char *var, const char *umsg, int varflags)
|
|
{
|
|
const char *msg;
|
|
const char *tail;
|
|
|
|
tail = nullstr;
|
|
msg = "parameter not set";
|
|
if (umsg) {
|
|
if ((unsigned char)*end == CTLENDVAR) {
|
|
if (varflags & VSNUL)
|
|
tail = " or null";
|
|
} else {
|
|
msg = umsg;
|
|
}
|
|
}
|
|
ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
|
|
}
|
|
|
|
static const char *
|
|
subevalvar(char *p, char *varname, int strloc, int subtype,
|
|
int startloc, int varflags, int flag)
|
|
{
|
|
struct nodelist *saveargbackq = argbackq;
|
|
int quotes = flag & QUOTES_ESC;
|
|
char *startp;
|
|
char *loc;
|
|
char *rmesc, *rmescend;
|
|
char *str;
|
|
int amount, resetloc;
|
|
int argstr_flags;
|
|
IF_BASH_PATTERN_SUBST(int workloc;)
|
|
IF_BASH_PATTERN_SUBST(int slash_pos;)
|
|
IF_BASH_PATTERN_SUBST(char *repl;)
|
|
int zero;
|
|
char *(*scan)(char*, char*, char*, char*, int, int);
|
|
|
|
//bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
|
|
// p, varname, strloc, subtype, startloc, varflags, quotes);
|
|
|
|
#if BASH_PATTERN_SUBST
|
|
/* For "${v/pattern/repl}", we must find the delimiter _before_
|
|
* argstr() call expands possible variable references in pattern:
|
|
* think about "v=a; a=a/; echo ${v/$a/r}" case.
|
|
*/
|
|
repl = NULL;
|
|
if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
|
|
/* Find '/' and replace with NUL */
|
|
repl = p;
|
|
/* The pattern can't be empty.
|
|
* IOW: if the first char after "${v//" is a slash,
|
|
* it does not terminate the pattern - it's the first char of the pattern:
|
|
* v=/dev/ram; echo ${v////-} prints -dev-ram (pattern is "/")
|
|
* v=/dev/ram; echo ${v///r/-} prints /dev-am (pattern is "/r")
|
|
*/
|
|
if (*repl == '/')
|
|
repl++;
|
|
for (;;) {
|
|
if (*repl == '\0') {
|
|
repl = NULL;
|
|
break;
|
|
}
|
|
if (*repl == '/') {
|
|
*repl = '\0';
|
|
break;
|
|
}
|
|
/* Handle escaped slashes, e.g. "${v/\//_}" (they are CTLESC'ed by this point) */
|
|
if ((unsigned char)*repl == CTLESC && repl[1])
|
|
repl++;
|
|
repl++;
|
|
}
|
|
}
|
|
#endif
|
|
argstr_flags = EXP_TILDE;
|
|
if (subtype != VSASSIGN
|
|
&& subtype != VSQUESTION
|
|
#if BASH_SUBSTR
|
|
&& subtype != VSSUBSTR
|
|
#endif
|
|
) {
|
|
/* EXP_CASE keeps CTLESC's */
|
|
argstr_flags = EXP_TILDE | EXP_CASE;
|
|
}
|
|
argstr(p, argstr_flags);
|
|
//bb_error_msg("str0:'%s'", (char *)stackblock() + strloc);
|
|
#if BASH_PATTERN_SUBST
|
|
slash_pos = -1;
|
|
if (repl) {
|
|
slash_pos = expdest - ((char *)stackblock() + strloc);
|
|
STPUTC('/', expdest);
|
|
//bb_error_msg("repl+1:'%s'", repl + 1);
|
|
argstr(repl + 1, EXP_TILDE); /* EXP_TILDE: echo "${v/x/~}" expands ~ ! */
|
|
*repl = '/';
|
|
}
|
|
#endif
|
|
STPUTC('\0', expdest);
|
|
argbackq = saveargbackq;
|
|
startp = (char *)stackblock() + startloc;
|
|
//bb_error_msg("str1:'%s'", (char *)stackblock() + strloc);
|
|
|
|
switch (subtype) {
|
|
case VSASSIGN:
|
|
setvar0(varname, startp);
|
|
amount = startp - expdest;
|
|
STADJUST(amount, expdest);
|
|
return startp;
|
|
|
|
case VSQUESTION:
|
|
varunset(p, varname, startp, varflags);
|
|
/* NOTREACHED */
|
|
|
|
#if BASH_SUBSTR
|
|
case VSSUBSTR: {
|
|
int pos, len, orig_len;
|
|
char *colon;
|
|
|
|
loc = str = stackblock() + strloc;
|
|
|
|
/* Read POS in ${var:POS:LEN} */
|
|
colon = strchr(loc, ':');
|
|
if (colon) *colon = '\0';
|
|
pos = substr_atoi(loc);
|
|
if (colon) *colon = ':';
|
|
|
|
/* Read LEN in ${var:POS:LEN} */
|
|
len = str - startp - 1;
|
|
/* *loc != '\0', guaranteed by parser */
|
|
if (quotes) {
|
|
char *ptr;
|
|
/* Adjust the length by the number of escapes */
|
|
for (ptr = startp; ptr < (str - 1); ptr++) {
|
|
if ((unsigned char)*ptr == CTLESC) {
|
|
len--;
|
|
ptr++;
|
|
}
|
|
}
|
|
}
|
|
orig_len = len;
|
|
if (*loc++ == ':') {
|
|
/* ${var::LEN} */
|
|
len = substr_atoi(loc);
|
|
} else {
|
|
/* Skip POS in ${var:POS:LEN} */
|
|
len = orig_len;
|
|
while (*loc && *loc != ':')
|
|
loc++;
|
|
if (*loc++ == ':')
|
|
len = substr_atoi(loc);
|
|
}
|
|
if (pos < 0) {
|
|
/* ${VAR:$((-n)):l} starts n chars from the end */
|
|
pos = orig_len + pos;
|
|
}
|
|
if ((unsigned)pos >= orig_len) {
|
|
/* apart from obvious ${VAR:999999:l},
|
|
* covers ${VAR:$((-9999999)):l} - result is ""
|
|
* (bash compat)
|
|
*/
|
|
pos = 0;
|
|
len = 0;
|
|
}
|
|
if (len < 0) {
|
|
/* ${VAR:N:-M} sets LEN to strlen()-M */
|
|
len = (orig_len - pos) + len;
|
|
}
|
|
if ((unsigned)len > (orig_len - pos))
|
|
len = orig_len - pos;
|
|
|
|
for (str = startp; pos; str++, pos--) {
|
|
if (quotes && (unsigned char)*str == CTLESC)
|
|
str++;
|
|
}
|
|
for (loc = startp; len; len--) {
|
|
if (quotes && (unsigned char)*str == CTLESC)
|
|
*loc++ = *str++;
|
|
*loc++ = *str++;
|
|
}
|
|
*loc = '\0';
|
|
amount = loc - expdest;
|
|
STADJUST(amount, expdest);
|
|
return loc;
|
|
}
|
|
#endif /* BASH_SUBSTR */
|
|
}
|
|
|
|
resetloc = expdest - (char *)stackblock();
|
|
|
|
#if BASH_PATTERN_SUBST
|
|
repl = NULL;
|
|
|
|
/* We'll comeback here if we grow the stack while handling
|
|
* a VSREPLACE or VSREPLACEALL, since our pointers into the
|
|
* stack will need rebasing, and we'll need to remove our work
|
|
* areas each time
|
|
*/
|
|
restart:
|
|
#endif
|
|
|
|
amount = expdest - ((char *)stackblock() + resetloc);
|
|
STADJUST(-amount, expdest);
|
|
startp = (char *)stackblock() + startloc;
|
|
|
|
rmesc = startp;
|
|
rmescend = (char *)stackblock() + strloc;
|
|
//bb_error_msg("str7:'%s'", rmescend);
|
|
if (quotes) {
|
|
//TODO: how to handle slash_pos here if string changes (shortens?)
|
|
rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW, NULL);
|
|
if (rmesc != startp) {
|
|
rmescend = expdest;
|
|
startp = (char *)stackblock() + startloc;
|
|
}
|
|
}
|
|
rmescend--;
|
|
str = (char *)stackblock() + strloc;
|
|
/*
|
|
* Example: v='a\bc'; echo ${v/\\b/_\\_\z_}
|
|
* The result is a_\_z_c (not a\_\_z_c)!
|
|
*
|
|
* The search pattern and replace string treat backslashes differently!
|
|
* "&slash_pos" causes rmescapes() to work differently on the pattern
|
|
* and string. It's only used on the first call.
|
|
*/
|
|
//bb_error_msg("str8:'%s' slash_pos:%d", str, slash_pos);
|
|
rmescapes(str, RMESCAPE_GLOB,
|
|
repl ? NULL : (slash_pos < 0 ? NULL : &slash_pos)
|
|
);
|
|
|
|
#if BASH_PATTERN_SUBST
|
|
workloc = expdest - (char *)stackblock();
|
|
if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
|
|
int len;
|
|
char *idx, *end;
|
|
|
|
if (!repl) {
|
|
//bb_error_msg("str9:'%s' slash_pos:%d", str, slash_pos);
|
|
repl = nullstr;
|
|
if (slash_pos >= 0) {
|
|
repl = str + slash_pos;
|
|
*repl++ = '\0';
|
|
}
|
|
}
|
|
//bb_error_msg("str:'%s' repl:'%s'", str, repl);
|
|
|
|
/* If there's no pattern to match, return the expansion unmolested */
|
|
if (str[0] == '\0')
|
|
return NULL;
|
|
|
|
len = 0;
|
|
idx = startp;
|
|
end = str - 1;
|
|
while (idx < end) {
|
|
try_to_match:
|
|
loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
|
|
//bb_error_msg("scanright('%s'):'%s'", str, loc);
|
|
if (!loc) {
|
|
/* No match, advance */
|
|
char *restart_detect = stackblock();
|
|
skip_matching:
|
|
STPUTC(*idx, expdest);
|
|
if (quotes && (unsigned char)*idx == CTLESC) {
|
|
idx++;
|
|
len++;
|
|
STPUTC(*idx, expdest);
|
|
}
|
|
if (stackblock() != restart_detect)
|
|
goto restart;
|
|
idx++;
|
|
len++;
|
|
rmesc++;
|
|
/* continue; - prone to quadratic behavior, smarter code: */
|
|
if (idx >= end)
|
|
break;
|
|
if (str[0] == '*') {
|
|
/* Pattern is "*foo". If "*foo" does not match "long_string",
|
|
* it would never match "ong_string" etc, no point in trying.
|
|
*/
|
|
goto skip_matching;
|
|
}
|
|
goto try_to_match;
|
|
}
|
|
|
|
if (subtype == VSREPLACEALL) {
|
|
while (idx < loc) {
|
|
if (quotes && (unsigned char)*idx == CTLESC)
|
|
idx++;
|
|
idx++;
|
|
rmesc++;
|
|
}
|
|
} else {
|
|
idx = loc;
|
|
}
|
|
|
|
//bb_error_msg("repl:'%s'", repl);
|
|
for (loc = (char*)repl; *loc; loc++) {
|
|
char *restart_detect = stackblock();
|
|
if (quotes && *loc == '\\') {
|
|
STPUTC(CTLESC, expdest);
|
|
len++;
|
|
}
|
|
STPUTC(*loc, expdest);
|
|
if (stackblock() != restart_detect)
|
|
goto restart;
|
|
len++;
|
|
}
|
|
|
|
if (subtype == VSREPLACE) {
|
|
//bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
|
|
while (*idx) {
|
|
char *restart_detect = stackblock();
|
|
STPUTC(*idx, expdest);
|
|
if (stackblock() != restart_detect)
|
|
goto restart;
|
|
len++;
|
|
idx++;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* We've put the replaced text into a buffer at workloc, now
|
|
* move it to the right place and adjust the stack.
|
|
*/
|
|
STPUTC('\0', expdest);
|
|
startp = (char *)stackblock() + startloc;
|
|
memmove(startp, (char *)stackblock() + workloc, len + 1);
|
|
//bb_error_msg("startp:'%s'", startp);
|
|
amount = expdest - (startp + len);
|
|
STADJUST(-amount, expdest);
|
|
return startp;
|
|
}
|
|
#endif /* BASH_PATTERN_SUBST */
|
|
|
|
subtype -= VSTRIMRIGHT;
|
|
#if DEBUG
|
|
if (subtype < 0 || subtype > 7)
|
|
abort();
|
|
#endif
|
|
/* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */
|
|
zero = subtype >> 1;
|
|
/* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
|
|
scan = (subtype & 1) ^ zero ? scanleft : scanright;
|
|
|
|
loc = scan(startp, rmesc, rmescend, str, quotes, zero);
|
|
if (loc) {
|
|
if (zero) {
|
|
memmove(startp, loc, str - loc);
|
|
loc = startp + (str - loc) - 1;
|
|
}
|
|
*loc = '\0';
|
|
amount = loc - expdest;
|
|
STADJUST(amount, expdest);
|
|
}
|
|
return loc;
|
|
}
|
|
|
|
/*
|
|
* Add the value of a specialized variable to the stack string.
|
|
* name parameter (examples):
|
|
* ash -c 'echo $1' name:'1='
|
|
* ash -c 'echo $qwe' name:'qwe='
|
|
* ash -c 'echo $$' name:'$='
|
|
* ash -c 'echo ${$}' name:'$='
|
|
* ash -c 'echo ${$##q}' name:'$=q'
|
|
* ash -c 'echo ${#$}' name:'$='
|
|
* note: examples with bad shell syntax:
|
|
* ash -c 'echo ${#$1}' name:'$=1'
|
|
* ash -c 'echo ${#1#}' name:'1=#'
|
|
*/
|
|
static NOINLINE ssize_t
|
|
varvalue(char *name, int varflags, int flags, int quoted)
|
|
{
|
|
const char *p;
|
|
int num;
|
|
int i;
|
|
ssize_t len = 0;
|
|
int sep;
|
|
int subtype = varflags & VSTYPE;
|
|
int discard = subtype == VSPLUS || subtype == VSLENGTH;
|
|
int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
|
|
int syntax;
|
|
|
|
sep = (flags & EXP_FULL) << CHAR_BIT;
|
|
syntax = quoted ? DQSYNTAX : BASESYNTAX;
|
|
|
|
switch (*name) {
|
|
case '$':
|
|
num = rootpid;
|
|
goto numvar;
|
|
case '?':
|
|
num = exitstatus;
|
|
goto numvar;
|
|
case '#':
|
|
num = shellparam.nparam;
|
|
goto numvar;
|
|
case '!':
|
|
num = backgndpid;
|
|
if (num == 0)
|
|
return -1;
|
|
numvar:
|
|
len = cvtnum(num);
|
|
goto check_1char_name;
|
|
case '-':
|
|
expdest = makestrspace(NOPTS, expdest);
|
|
for (i = NOPTS - 1; i >= 0; i--) {
|
|
if (optlist[i] && optletters(i)) {
|
|
USTPUTC(optletters(i), expdest);
|
|
len++;
|
|
}
|
|
}
|
|
check_1char_name:
|
|
#if 0
|
|
/* handles cases similar to ${#$1} */
|
|
if (name[2] != '\0')
|
|
raise_error_syntax("bad substitution");
|
|
#endif
|
|
break;
|
|
case '@':
|
|
if (quoted && sep)
|
|
goto param;
|
|
/* fall through */
|
|
case '*': {
|
|
char **ap;
|
|
char sepc;
|
|
char c;
|
|
|
|
/* We will set c to 0 or ~0 depending on whether
|
|
* we're doing field splitting. We won't do field
|
|
* splitting if either we're quoted or sep is zero.
|
|
*
|
|
* Instead of testing (quoted || !sep) the following
|
|
* trick optimises away any branches by using the
|
|
* fact that EXP_QUOTED (which is the only bit that
|
|
* can be set in quoted) is the same as EXP_FULL <<
|
|
* CHAR_BIT (which is the only bit that can be set
|
|
* in sep).
|
|
*/
|
|
#if EXP_QUOTED >> CHAR_BIT != EXP_FULL
|
|
#error The following two lines expect EXP_QUOTED == EXP_FULL << CHAR_BIT
|
|
#endif
|
|
c = !((quoted | ~sep) & EXP_QUOTED) - 1;
|
|
sep &= ~quoted;
|
|
sep |= ifsset() ? (unsigned char)(c & ifsval()[0]) : ' ';
|
|
param:
|
|
sepc = sep;
|
|
ap = shellparam.p;
|
|
if (!ap)
|
|
return -1;
|
|
while ((p = *ap++) != NULL) {
|
|
len += strtodest(p, syntax, quotes);
|
|
|
|
if (*ap && sep) {
|
|
len++;
|
|
memtodest(&sepc, 1, syntax, quotes);
|
|
}
|
|
}
|
|
break;
|
|
} /* case '*' */
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
case '8':
|
|
case '9':
|
|
num = atoi(name); /* number(name) fails on ${N#str} etc */
|
|
if (num < 0 || num > shellparam.nparam)
|
|
return -1;
|
|
p = num ? shellparam.p[num - 1] : arg0;
|
|
goto value;
|
|
default:
|
|
/* NB: name has form "VAR=..." */
|
|
p = lookupvar(name);
|
|
value:
|
|
if (!p)
|
|
return -1;
|
|
|
|
len = strtodest(p, syntax, quotes);
|
|
#if ENABLE_UNICODE_SUPPORT
|
|
if (subtype == VSLENGTH && len > 0) {
|
|
reinit_unicode_for_ash();
|
|
if (unicode_status == UNICODE_ON) {
|
|
STADJUST(-len, expdest);
|
|
discard = 0;
|
|
len = unicode_strlen(p);
|
|
}
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
|
|
if (discard)
|
|
STADJUST(-len, expdest);
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Expand a variable, and return a pointer to the next character in the
|
|
* input string.
|
|
*/
|
|
static char *
|
|
evalvar(char *p, int flag)
|
|
{
|
|
char varflags;
|
|
char subtype;
|
|
int quoted;
|
|
char *var;
|
|
int patloc;
|
|
int startloc;
|
|
ssize_t varlen;
|
|
|
|
varflags = (unsigned char) *p++;
|
|
subtype = varflags & VSTYPE;
|
|
|
|
if (!subtype)
|
|
raise_error_syntax("bad substitution");
|
|
|
|
quoted = flag & EXP_QUOTED;
|
|
var = p;
|
|
startloc = expdest - (char *)stackblock();
|
|
p = strchr(p, '=') + 1; //TODO: use var_end(p)?
|
|
|
|
again:
|
|
varlen = varvalue(var, varflags, flag, quoted);
|
|
if (varflags & VSNUL)
|
|
varlen--;
|
|
|
|
if (subtype == VSPLUS) {
|
|
varlen = -1 - varlen;
|
|
goto vsplus;
|
|
}
|
|
|
|
if (subtype == VSMINUS) {
|
|
vsplus:
|
|
if (varlen < 0) {
|
|
argstr(
|
|
p,
|
|
flag | EXP_TILDE | EXP_WORD
|
|
);
|
|
goto end;
|
|
}
|
|
goto record;
|
|
}
|
|
|
|
if (subtype == VSASSIGN || subtype == VSQUESTION) {
|
|
if (varlen >= 0)
|
|
goto record;
|
|
|
|
subevalvar(p, var, 0, subtype, startloc, varflags,
|
|
flag & ~QUOTES_ESC);
|
|
varflags &= ~VSNUL;
|
|
/*
|
|
* Remove any recorded regions beyond
|
|
* start of variable
|
|
*/
|
|
removerecordregions(startloc);
|
|
goto again;
|
|
}
|
|
|
|
if (varlen < 0 && uflag)
|
|
varunset(p, var, 0, 0);
|
|
|
|
if (subtype == VSLENGTH) {
|
|
cvtnum(varlen > 0 ? varlen : 0);
|
|
goto record;
|
|
}
|
|
|
|
if (subtype == VSNORMAL) {
|
|
record:
|
|
if (quoted) {
|
|
quoted = *var == '@' && shellparam.nparam;
|
|
if (!quoted)
|
|
goto end;
|
|
}
|
|
recordregion(startloc, expdest - (char *)stackblock(), quoted);
|
|
goto end;
|
|
}
|
|
|
|
#if DEBUG
|
|
switch (subtype) {
|
|
case VSTRIMLEFT:
|
|
case VSTRIMLEFTMAX:
|
|
case VSTRIMRIGHT:
|
|
case VSTRIMRIGHTMAX:
|
|
#if BASH_SUBSTR
|
|
case VSSUBSTR:
|
|
#endif
|
|
#if BASH_PATTERN_SUBST
|
|
case VSREPLACE:
|
|
case VSREPLACEALL:
|
|
#endif
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
#endif
|
|
|
|
if (varlen >= 0) {
|
|
/*
|
|
* Terminate the string and start recording the pattern
|
|
* right after it
|
|
*/
|
|
STPUTC('\0', expdest);
|
|
patloc = expdest - (char *)stackblock();
|
|
if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
|
|
startloc, varflags, flag)) {
|
|
int amount = expdest - (
|
|
(char *)stackblock() + patloc - 1
|
|
);
|
|
STADJUST(-amount, expdest);
|
|
}
|
|
/* Remove any recorded regions beyond start of variable */
|
|
removerecordregions(startloc);
|
|
goto record;
|
|
}
|
|
|
|
end:
|
|
if (subtype != VSNORMAL) { /* skip to end of alternative */
|
|
int nesting = 1;
|
|
for (;;) {
|
|
unsigned char c = *p++;
|
|
if (c == CTLESC)
|
|
p++;
|
|
else if (c == CTLBACKQ) {
|
|
if (varlen >= 0)
|
|
argbackq = argbackq->next;
|
|
} else if (c == CTLVAR) {
|
|
if ((*p++ & VSTYPE) != VSNORMAL)
|
|
nesting++;
|
|
} else if (c == CTLENDVAR) {
|
|
if (--nesting == 0)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return p;
|
|
}
|
|
|
|
/*
|
|
* Add a file name to the list.
|
|
*/
|
|
static void
|
|
addfname(const char *name)
|
|
{
|
|
struct strlist *sp;
|
|
|
|
sp = stzalloc(sizeof(*sp));
|
|
sp->text = sstrdup(name);
|
|
*exparg.lastp = sp;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
|
|
/* Avoid glob() (and thus, stat() et al) for words like "echo" */
|
|
static int
|
|
hasmeta(const char *p)
|
|
{
|
|
static const char chars[] ALIGN1 = {
|
|
'*', '?', '[', '\\', CTLQUOTEMARK, CTLESC, 0
|
|
};
|
|
|
|
for (;;) {
|
|
p = strpbrk(p, chars);
|
|
if (!p)
|
|
break;
|
|
switch ((unsigned char)*p) {
|
|
case CTLQUOTEMARK:
|
|
for (;;) {
|
|
p++;
|
|
if ((unsigned char)*p == CTLQUOTEMARK)
|
|
break;
|
|
if ((unsigned char)*p == CTLESC)
|
|
p++;
|
|
if (*p == '\0') /* huh? */
|
|
return 0;
|
|
}
|
|
break;
|
|
case '\\':
|
|
case CTLESC:
|
|
p++;
|
|
if (*p == '\0')
|
|
return 0;
|
|
break;
|
|
case '[':
|
|
if (!strchr(p + 1, ']')) {
|
|
/* It's not a properly closed [] pattern,
|
|
* but other metas may follow. Continue checking.
|
|
* my[file* _is_ globbed by bash
|
|
* and matches filenames like "my[file1".
|
|
*/
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
default:
|
|
/* case '*': */
|
|
/* case '?': */
|
|
return 1;
|
|
}
|
|
p++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* If we want to use glob() from libc... */
|
|
#if !ENABLE_ASH_INTERNAL_GLOB
|
|
|
|
/* Add the result of glob() to the list */
|
|
static void
|
|
addglob(const glob_t *pglob)
|
|
{
|
|
char **p = pglob->gl_pathv;
|
|
|
|
do {
|
|
addfname(*p);
|
|
} while (*++p);
|
|
}
|
|
static void
|
|
expandmeta(struct strlist *str /*, int flag*/)
|
|
{
|
|
/* TODO - EXP_REDIR */
|
|
|
|
while (str) {
|
|
char *p;
|
|
glob_t pglob;
|
|
int i;
|
|
|
|
if (fflag)
|
|
goto nometa;
|
|
|
|
if (!hasmeta(str->text))
|
|
goto nometa;
|
|
|
|
INT_OFF;
|
|
p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
|
|
// GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
|
|
// GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
|
|
//
|
|
// glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping:
|
|
// if you pass it "file\?", it returns "file\?", not "file?", if no match.
|
|
// Which means you need to unescape the string, right? Not so fast:
|
|
// if there _is_ a file named "file\?" (with backslash), it is returned
|
|
// as "file\?" too (whichever pattern you used to find it, say, "file*").
|
|
// You DON'T KNOW by looking at the result whether you need to unescape it.
|
|
//
|
|
// Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?",
|
|
// returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file.
|
|
// Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match).
|
|
// With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly.
|
|
// i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob);
|
|
// i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
|
|
i = glob(p, 0, NULL, &pglob);
|
|
//bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-");
|
|
if (p != str->text)
|
|
free(p);
|
|
switch (i) {
|
|
case 0:
|
|
#if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR
|
|
/* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
|
|
if (!(pglob.gl_flags & GLOB_MAGCHAR))
|
|
goto nometa2;
|
|
#endif
|
|
addglob(&pglob);
|
|
globfree(&pglob);
|
|
INT_ON;
|
|
break;
|
|
case GLOB_NOMATCH:
|
|
//nometa2:
|
|
globfree(&pglob);
|
|
INT_ON;
|
|
nometa:
|
|
*exparg.lastp = str;
|
|
rmescapes(str->text, 0, NULL);
|
|
exparg.lastp = &str->next;
|
|
break;
|
|
default: /* GLOB_NOSPACE */
|
|
globfree(&pglob);
|
|
INT_ON;
|
|
ash_msg_and_raise_error(bb_msg_memory_exhausted);
|
|
}
|
|
str = str->next;
|
|
}
|
|
}
|
|
|
|
#else
|
|
/* ENABLE_ASH_INTERNAL_GLOB: Homegrown globbing code. (dash also has both, uses homegrown one.) */
|
|
|
|
/*
|
|
* Do metacharacter (i.e. *, ?, [...]) expansion.
|
|
*/
|
|
typedef struct exp_t {
|
|
char *dir;
|
|
unsigned dir_max;
|
|
} exp_t;
|
|
static void
|
|
expmeta(exp_t *exp, char *name, unsigned name_len, unsigned expdir_len)
|
|
{
|
|
#define expdir exp->dir
|
|
#define expdir_max exp->dir_max
|
|
char *enddir = expdir + expdir_len;
|
|
char *p;
|
|
const char *cp;
|
|
char *start;
|
|
char *endname;
|
|
int metaflag;
|
|
struct stat statb;
|
|
DIR *dirp;
|
|
struct dirent *dp;
|
|
int atend;
|
|
int matchdot;
|
|
int esc;
|
|
|
|
metaflag = 0;
|
|
start = name;
|
|
for (p = name; esc = 0, *p; p += esc + 1) {
|
|
if (*p == '*' || *p == '?')
|
|
metaflag = 1;
|
|
else if (*p == '[') {
|
|
char *q = p + 1;
|
|
if (*q == '!')
|
|
q++;
|
|
for (;;) {
|
|
if (*q == '\\')
|
|
q++;
|
|
if (*q == '/' || *q == '\0')
|
|
break;
|
|
if (*++q == ']') {
|
|
metaflag = 1;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
if (*p == '\\' && p[1])
|
|
esc++;
|
|
if (p[esc] == '/') {
|
|
if (metaflag)
|
|
break;
|
|
start = p + esc + 1;
|
|
}
|
|
}
|
|
}
|
|
if (metaflag == 0) { /* we've reached the end of the file name */
|
|
if (!expdir_len)
|
|
return;
|
|
p = name;
|
|
do {
|
|
if (*p == '\\' && p[1])
|
|
p++;
|
|
*enddir++ = *p;
|
|
} while (*p++);
|
|
if (lstat(expdir, &statb) == 0)
|
|
addfname(expdir);
|
|
return;
|
|
}
|
|
endname = p;
|
|
if (name < start) {
|
|
p = name;
|
|
do {
|
|
if (*p == '\\' && p[1])
|
|
p++;
|
|
*enddir++ = *p++;
|
|
} while (p < start);
|
|
}
|
|
*enddir = '\0';
|
|
cp = expdir;
|
|
expdir_len = enddir - cp;
|
|
if (!expdir_len)
|
|
cp = ".";
|
|
dirp = opendir(cp);
|
|
if (dirp == NULL)
|
|
return;
|
|
if (*endname == 0) {
|
|
atend = 1;
|
|
} else {
|
|
atend = 0;
|
|
*endname = '\0';
|
|
endname += esc + 1;
|
|
}
|
|
name_len -= endname - name;
|
|
matchdot = 0;
|
|
p = start;
|
|
if (*p == '\\')
|
|
p++;
|
|
if (*p == '.')
|
|
matchdot++;
|
|
while (!pending_int && (dp = readdir(dirp)) != NULL) {
|
|
if (dp->d_name[0] == '.' && !matchdot)
|
|
continue;
|
|
if (pmatch(start, dp->d_name)) {
|
|
if (atend) {
|
|
strcpy(enddir, dp->d_name);
|
|
addfname(expdir);
|
|
} else {
|
|
unsigned offset;
|
|
unsigned len;
|
|
|
|
p = stpcpy(enddir, dp->d_name);
|
|
*p = '/';
|
|
|
|
offset = p - expdir + 1;
|
|
len = offset + name_len + NAME_MAX;
|
|
if (len > expdir_max) {
|
|
len += PATH_MAX;
|
|
expdir = ckrealloc(expdir, len);
|
|
expdir_max = len;
|
|
}
|
|
|
|
expmeta(exp, endname, name_len, offset);
|
|
enddir = expdir + expdir_len;
|
|
}
|
|
}
|
|
}
|
|
closedir(dirp);
|
|
if (!atend)
|
|
endname[-esc - 1] = esc ? '\\' : '/';
|
|
#undef expdir
|
|
#undef expdir_max
|
|
}
|
|
|
|
static struct strlist *
|
|
msort(struct strlist *list, int len)
|
|
{
|
|
struct strlist *p, *q = NULL;
|
|
struct strlist **lpp;
|
|
int half;
|
|
int n;
|
|
|
|
if (len <= 1)
|
|
return list;
|
|
half = len >> 1;
|
|
p = list;
|
|
for (n = half; --n >= 0;) {
|
|
q = p;
|
|
p = p->next;
|
|
}
|
|
q->next = NULL; /* terminate first half of list */
|
|
q = msort(list, half); /* sort first half of list */
|
|
p = msort(p, len - half); /* sort second half */
|
|
lpp = &list;
|
|
for (;;) {
|
|
#if ENABLE_LOCALE_SUPPORT
|
|
if (strcoll(p->text, q->text) < 0)
|
|
#else
|
|
if (strcmp(p->text, q->text) < 0)
|
|
#endif
|
|
{
|
|
*lpp = p;
|
|
lpp = &p->next;
|
|
p = *lpp;
|
|
if (p == NULL) {
|
|
*lpp = q;
|
|
break;
|
|
}
|
|
} else {
|
|
*lpp = q;
|
|
lpp = &q->next;
|
|
q = *lpp;
|
|
if (q == NULL) {
|
|
*lpp = p;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return list;
|
|
}
|
|
|
|
/*
|
|
* Sort the results of file name expansion. It calculates the number of
|
|
* strings to sort and then calls msort (short for merge sort) to do the
|
|
* work.
|
|
*/
|
|
static struct strlist *
|
|
expsort(struct strlist *str)
|
|
{
|
|
int len;
|
|
struct strlist *sp;
|
|
|
|
len = 0;
|
|
for (sp = str; sp; sp = sp->next)
|
|
len++;
|
|
return msort(str, len);
|
|
}
|
|
|
|
static void
|
|
expandmeta(struct strlist *str /*, int flag*/)
|
|
{
|
|
/* TODO - EXP_REDIR */
|
|
|
|
while (str) {
|
|
exp_t exp;
|
|
struct strlist **savelastp;
|
|
struct strlist *sp;
|
|
char *p;
|
|
unsigned len;
|
|
|
|
if (fflag)
|
|
goto nometa;
|
|
if (!hasmeta(str->text))
|
|
goto nometa;
|
|
savelastp = exparg.lastp;
|
|
|
|
INT_OFF;
|
|
p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
|
|
len = strlen(p);
|
|
exp.dir_max = len + PATH_MAX;
|
|
exp.dir = ckmalloc(exp.dir_max);
|
|
|
|
expmeta(&exp, p, len, 0);
|
|
free(exp.dir);
|
|
if (p != str->text)
|
|
free(p);
|
|
INT_ON;
|
|
if (exparg.lastp == savelastp) {
|
|
/*
|
|
* no matches
|
|
*/
|
|
nometa:
|
|
*exparg.lastp = str;
|
|
rmescapes(str->text, 0, NULL);
|
|
exparg.lastp = &str->next;
|
|
} else {
|
|
*exparg.lastp = NULL;
|
|
*savelastp = sp = expsort(*savelastp);
|
|
while (sp->next != NULL)
|
|
sp = sp->next;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
str = str->next;
|
|
}
|
|
}
|
|
#endif /* ENABLE_ASH_INTERNAL_GLOB */
|
|
|
|
/*
|
|
* Perform variable substitution and command substitution on an argument,
|
|
* placing the resulting list of arguments in arglist. If EXP_FULL is true,
|
|
* perform splitting and file name expansion. When arglist is NULL, perform
|
|
* here document expansion.
|
|
*/
|
|
static void
|
|
expandarg(union node *arg, struct arglist *arglist, int flag)
|
|
{
|
|
struct strlist *sp;
|
|
char *p;
|
|
|
|
argbackq = arg->narg.backquote;
|
|
STARTSTACKSTR(expdest);
|
|
TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
|
|
argstr(arg->narg.text, flag);
|
|
p = _STPUTC('\0', expdest);
|
|
expdest = p - 1;
|
|
if (arglist == NULL) {
|
|
/* here document expanded */
|
|
goto out;
|
|
}
|
|
p = grabstackstr(p);
|
|
TRACE(("expandarg: p:'%s'\n", p));
|
|
exparg.lastp = &exparg.list;
|
|
/*
|
|
* TODO - EXP_REDIR
|
|
*/
|
|
if (flag & EXP_FULL) {
|
|
ifsbreakup(p, &exparg);
|
|
*exparg.lastp = NULL;
|
|
exparg.lastp = &exparg.list;
|
|
expandmeta(exparg.list /*, flag*/);
|
|
} else {
|
|
sp = stzalloc(sizeof(*sp));
|
|
sp->text = p;
|
|
*exparg.lastp = sp;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
*exparg.lastp = NULL;
|
|
if (exparg.list) {
|
|
*arglist->lastp = exparg.list;
|
|
arglist->lastp = exparg.lastp;
|
|
}
|
|
|
|
out:
|
|
ifsfree();
|
|
}
|
|
|
|
/*
|
|
* Expand shell variables and backquotes inside a here document.
|
|
*/
|
|
static void
|
|
expandhere(union node *arg, int fd)
|
|
{
|
|
expandarg(arg, (struct arglist *)NULL, EXP_QUOTED);
|
|
full_write(fd, stackblock(), expdest - (char *)stackblock());
|
|
}
|
|
|
|
/*
|
|
* Returns true if the pattern matches the string.
|
|
*/
|
|
static int
|
|
patmatch(char *pattern, const char *string)
|
|
{
|
|
char *p = preglob(pattern, 0);
|
|
int r = pmatch(p, string);
|
|
//bb_error_msg("!fnmatch(pattern:'%s',str:'%s',0):%d", p, string, r);
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* See if a pattern matches in a case statement.
|
|
*/
|
|
static int
|
|
casematch(union node *pattern, char *val)
|
|
{
|
|
struct stackmark smark;
|
|
int result;
|
|
|
|
setstackmark(&smark);
|
|
argbackq = pattern->narg.backquote;
|
|
STARTSTACKSTR(expdest);
|
|
argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
|
|
STACKSTRNUL(expdest);
|
|
ifsfree();
|
|
result = patmatch(stackblock(), val);
|
|
popstackmark(&smark);
|
|
return result;
|
|
}
|
|
|
|
|
|
/* ============ find_command */
|
|
|
|
struct builtincmd {
|
|
const char *name;
|
|
int (*builtin)(int, char **) FAST_FUNC;
|
|
/* unsigned flags; */
|
|
};
|
|
#define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
|
|
/* "regular" builtins always take precedence over commands,
|
|
* regardless of PATH=....%builtin... position */
|
|
#define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
|
|
#define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
|
|
|
|
struct cmdentry {
|
|
smallint cmdtype; /* CMDxxx */
|
|
union param {
|
|
int index;
|
|
/* index >= 0 for commands without path (slashes) */
|
|
/* (TODO: what exactly does the value mean? PATH position?) */
|
|
/* index == -1 for commands with slashes */
|
|
/* index == (-2 - applet_no) for NOFORK applets */
|
|
const struct builtincmd *cmd;
|
|
struct funcnode *func;
|
|
} u;
|
|
};
|
|
/* values of cmdtype */
|
|
#define CMDUNKNOWN -1 /* no entry in table for command */
|
|
#define CMDNORMAL 0 /* command is an executable program */
|
|
#define CMDFUNCTION 1 /* command is a shell function */
|
|
#define CMDBUILTIN 2 /* command is a shell builtin */
|
|
|
|
/* action to find_command() */
|
|
#define DO_ERR 0x01 /* prints errors */
|
|
#define DO_ABS 0x02 /* checks absolute paths */
|
|
#define DO_NOFUNC 0x04 /* don't return shell functions, for command */
|
|
#define DO_ALTPATH 0x08 /* using alternate path */
|
|
#define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
|
|
|
|
static void find_command(char *, struct cmdentry *, int, const char *);
|
|
|
|
|
|
/* ============ Hashing commands */
|
|
|
|
/*
|
|
* When commands are first encountered, they are entered in a hash table.
|
|
* This ensures that a full path search will not have to be done for them
|
|
* on each invocation.
|
|
*
|
|
* We should investigate converting to a linear search, even though that
|
|
* would make the command name "hash" a misnomer.
|
|
*/
|
|
|
|
struct tblentry {
|
|
struct tblentry *next; /* next entry in hash chain */
|
|
union param param; /* definition of builtin function */
|
|
smallint cmdtype; /* CMDxxx */
|
|
char rehash; /* if set, cd done since entry created */
|
|
char cmdname[1]; /* name of command */
|
|
};
|
|
|
|
static struct tblentry **cmdtable;
|
|
#define INIT_G_cmdtable() do { \
|
|
cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
|
|
} while (0)
|
|
|
|
static int builtinloc = -1; /* index in path of %builtin, or -1 */
|
|
|
|
|
|
static void
|
|
tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) const char *cmd, char **argv, char **envp)
|
|
{
|
|
#if ENABLE_FEATURE_SH_STANDALONE
|
|
if (applet_no >= 0) {
|
|
if (APPLET_IS_NOEXEC(applet_no)) {
|
|
clearenv();
|
|
while (*envp)
|
|
putenv(*envp++);
|
|
popredir(/*drop:*/ 1);
|
|
run_noexec_applet_and_exit(applet_no, cmd, argv);
|
|
}
|
|
/* re-exec ourselves with the new arguments */
|
|
execve(bb_busybox_exec_path, argv, envp);
|
|
/* If they called chroot or otherwise made the binary no longer
|
|
* executable, fall through */
|
|
}
|
|
#endif
|
|
|
|
repeat:
|
|
#ifdef SYSV
|
|
do {
|
|
execve(cmd, argv, envp);
|
|
} while (errno == EINTR);
|
|
#else
|
|
execve(cmd, argv, envp);
|
|
#endif
|
|
|
|
if (cmd != bb_busybox_exec_path && errno == ENOEXEC) {
|
|
/* Run "cmd" as a shell script:
|
|
* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
|
|
* "If the execve() function fails with ENOEXEC, the shell
|
|
* shall execute a command equivalent to having a shell invoked
|
|
* with the command name as its first operand,
|
|
* with any remaining arguments passed to the new shell"
|
|
*
|
|
* That is, do not use $SHELL, user's shell, or /bin/sh;
|
|
* just call ourselves.
|
|
*
|
|
* Note that bash reads ~80 chars of the file, and if it sees
|
|
* a zero byte before it sees newline, it doesn't try to
|
|
* interpret it, but fails with "cannot execute binary file"
|
|
* message and exit code 126. For one, this prevents attempts
|
|
* to interpret foreign ELF binaries as shell scripts.
|
|
*/
|
|
argv[0] = (char*) cmd;
|
|
cmd = bb_busybox_exec_path;
|
|
/* NB: this is only possible because all callers of shellexec()
|
|
* ensure that the argv[-1] slot exists!
|
|
*/
|
|
argv--;
|
|
argv[0] = (char*) "ash";
|
|
goto repeat;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Exec a program. Never returns. If you change this routine, you may
|
|
* have to change the find_command routine as well.
|
|
* argv[-1] must exist and be writable! See tryexec() for why.
|
|
*/
|
|
static void shellexec(char *prog, char **argv, const char *path, int idx) NORETURN;
|
|
static void shellexec(char *prog, char **argv, const char *path, int idx)
|
|
{
|
|
char *cmdname;
|
|
int e;
|
|
char **envp;
|
|
int exerrno;
|
|
int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
|
|
|
|
envp = listvars(VEXPORT, VUNSET, /*strlist:*/ NULL, /*end:*/ NULL);
|
|
if (strchr(prog, '/') != NULL
|
|
#if ENABLE_FEATURE_SH_STANDALONE
|
|
|| (applet_no = find_applet_by_name(prog)) >= 0
|
|
#endif
|
|
) {
|
|
tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) prog, argv, envp);
|
|
if (applet_no >= 0) {
|
|
/* We tried execing ourself, but it didn't work.
|
|
* Maybe /proc/self/exe doesn't exist?
|
|
* Try $PATH search.
|
|
*/
|
|
goto try_PATH;
|
|
}
|
|
e = errno;
|
|
} else {
|
|
try_PATH:
|
|
e = ENOENT;
|
|
while ((cmdname = path_advance(&path, prog)) != NULL) {
|
|
if (--idx < 0 && pathopt == NULL) {
|
|
tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
|
|
if (errno != ENOENT && errno != ENOTDIR)
|
|
e = errno;
|
|
}
|
|
stunalloc(cmdname);
|
|
}
|
|
}
|
|
|
|
/* Map to POSIX errors */
|
|
switch (e) {
|
|
default:
|
|
exerrno = 126;
|
|
break;
|
|
case ELOOP:
|
|
case ENAMETOOLONG:
|
|
case ENOENT:
|
|
case ENOTDIR:
|
|
exerrno = 127;
|
|
break;
|
|
}
|
|
exitstatus = exerrno;
|
|
TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
|
|
prog, e, suppress_int));
|
|
ash_msg_and_raise(EXEXIT, "%s: %s", prog, errmsg(e, "not found"));
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void
|
|
printentry(struct tblentry *cmdp)
|
|
{
|
|
int idx;
|
|
const char *path;
|
|
char *name;
|
|
|
|
idx = cmdp->param.index;
|
|
path = pathval();
|
|
do {
|
|
name = path_advance(&path, cmdp->cmdname);
|
|
stunalloc(name);
|
|
} while (--idx >= 0);
|
|
out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
|
|
}
|
|
|
|
/*
|
|
* Clear out command entries. The argument specifies the first entry in
|
|
* PATH which has changed.
|
|
*/
|
|
static void
|
|
clearcmdentry(int firstchange)
|
|
{
|
|
struct tblentry **tblp;
|
|
struct tblentry **pp;
|
|
struct tblentry *cmdp;
|
|
|
|
INT_OFF;
|
|
for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
|
|
pp = tblp;
|
|
while ((cmdp = *pp) != NULL) {
|
|
if ((cmdp->cmdtype == CMDNORMAL &&
|
|
cmdp->param.index >= firstchange)
|
|
|| (cmdp->cmdtype == CMDBUILTIN &&
|
|
builtinloc >= firstchange)
|
|
) {
|
|
*pp = cmdp->next;
|
|
free(cmdp);
|
|
} else {
|
|
pp = &cmdp->next;
|
|
}
|
|
}
|
|
}
|
|
INT_ON;
|
|
}
|
|
|
|
/*
|
|
* Locate a command in the command hash table. If "add" is nonzero,
|
|
* add the command to the table if it is not already present. The
|
|
* variable "lastcmdentry" is set to point to the address of the link
|
|
* pointing to the entry, so that delete_cmd_entry can delete the
|
|
* entry.
|
|
*
|
|
* Interrupts must be off if called with add != 0.
|
|
*/
|
|
static struct tblentry **lastcmdentry;
|
|
|
|
static struct tblentry *
|
|
cmdlookup(const char *name, int add)
|
|
{
|
|
unsigned int hashval;
|
|
const char *p;
|
|
struct tblentry *cmdp;
|
|
struct tblentry **pp;
|
|
|
|
p = name;
|
|
hashval = (unsigned char)*p << 4;
|
|
while (*p)
|
|
hashval += (unsigned char)*p++;
|
|
hashval &= 0x7FFF;
|
|
pp = &cmdtable[hashval % CMDTABLESIZE];
|
|
for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
|
|
if (strcmp(cmdp->cmdname, name) == 0)
|
|
break;
|
|
pp = &cmdp->next;
|
|
}
|
|
if (add && cmdp == NULL) {
|
|
cmdp = *pp = ckzalloc(sizeof(struct tblentry)
|
|
+ strlen(name)
|
|
/* + 1 - already done because
|
|
* tblentry::cmdname is char[1] */);
|
|
/*cmdp->next = NULL; - ckzalloc did it */
|
|
cmdp->cmdtype = CMDUNKNOWN;
|
|
strcpy(cmdp->cmdname, name);
|
|
}
|
|
lastcmdentry = pp;
|
|
return cmdp;
|
|
}
|
|
|
|
/*
|
|
* Delete the command entry returned on the last lookup.
|
|
*/
|
|
static void
|
|
delete_cmd_entry(void)
|
|
{
|
|
struct tblentry *cmdp;
|
|
|
|
INT_OFF;
|
|
cmdp = *lastcmdentry;
|
|
*lastcmdentry = cmdp->next;
|
|
if (cmdp->cmdtype == CMDFUNCTION)
|
|
freefunc(cmdp->param.func);
|
|
free(cmdp);
|
|
INT_ON;
|
|
}
|
|
|
|
/*
|
|
* Add a new command entry, replacing any existing command entry for
|
|
* the same name - except special builtins.
|
|
*/
|
|
static void
|
|
addcmdentry(char *name, struct cmdentry *entry)
|
|
{
|
|
struct tblentry *cmdp;
|
|
|
|
cmdp = cmdlookup(name, 1);
|
|
if (cmdp->cmdtype == CMDFUNCTION) {
|
|
freefunc(cmdp->param.func);
|
|
}
|
|
cmdp->cmdtype = entry->cmdtype;
|
|
cmdp->param = entry->u;
|
|
cmdp->rehash = 0;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
struct tblentry **pp;
|
|
struct tblentry *cmdp;
|
|
int c;
|
|
struct cmdentry entry;
|
|
char *name;
|
|
|
|
if (nextopt("r") != '\0') {
|
|
clearcmdentry(0);
|
|
return 0;
|
|
}
|
|
|
|
if (*argptr == NULL) {
|
|
for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
|
|
for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
|
|
if (cmdp->cmdtype == CMDNORMAL)
|
|
printentry(cmdp);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
c = 0;
|
|
while ((name = *argptr) != NULL) {
|
|
cmdp = cmdlookup(name, 0);
|
|
if (cmdp != NULL
|
|
&& (cmdp->cmdtype == CMDNORMAL
|
|
|| (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
|
|
) {
|
|
delete_cmd_entry();
|
|
}
|
|
find_command(name, &entry, DO_ERR, pathval());
|
|
if (entry.cmdtype == CMDUNKNOWN)
|
|
c = 1;
|
|
argptr++;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/*
|
|
* Called when a cd is done. Marks all commands so the next time they
|
|
* are executed they will be rehashed.
|
|
*/
|
|
static void
|
|
hashcd(void)
|
|
{
|
|
struct tblentry **pp;
|
|
struct tblentry *cmdp;
|
|
|
|
for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
|
|
for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
|
|
if (cmdp->cmdtype == CMDNORMAL
|
|
|| (cmdp->cmdtype == CMDBUILTIN
|
|
&& !IS_BUILTIN_REGULAR(cmdp->param.cmd)
|
|
&& builtinloc > 0)
|
|
) {
|
|
cmdp->rehash = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Fix command hash table when PATH changed.
|
|
* Called before PATH is changed. The argument is the new value of PATH;
|
|
* pathval() still returns the old value at this point.
|
|
* Called with interrupts off.
|
|
*/
|
|
static void FAST_FUNC
|
|
changepath(const char *new)
|
|
{
|
|
const char *old;
|
|
int firstchange;
|
|
int idx;
|
|
int idx_bltin;
|
|
|
|
old = pathval();
|
|
firstchange = 9999; /* assume no change */
|
|
idx = 0;
|
|
idx_bltin = -1;
|
|
for (;;) {
|
|
if (*old != *new) {
|
|
firstchange = idx;
|
|
if ((*old == '\0' && *new == ':')
|
|
|| (*old == ':' && *new == '\0')
|
|
) {
|
|
firstchange++;
|
|
}
|
|
old = new; /* ignore subsequent differences */
|
|
}
|
|
if (*new == '\0')
|
|
break;
|
|
if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
|
|
idx_bltin = idx;
|
|
if (*new == ':')
|
|
idx++;
|
|
new++;
|
|
old++;
|
|
}
|
|
if (builtinloc < 0 && idx_bltin >= 0)
|
|
builtinloc = idx_bltin; /* zap builtins */
|
|
if (builtinloc >= 0 && idx_bltin < 0)
|
|
firstchange = 0;
|
|
clearcmdentry(firstchange);
|
|
builtinloc = idx_bltin;
|
|
}
|
|
enum {
|
|
TEOF,
|
|
TNL,
|
|
TREDIR,
|
|
TWORD,
|
|
TSEMI,
|
|
TBACKGND,
|
|
TAND,
|
|
TOR,
|
|
TPIPE,
|
|
TLP,
|
|
TRP,
|
|
TENDCASE,
|
|
TENDBQUOTE,
|
|
TNOT,
|
|
TCASE,
|
|
TDO,
|
|
TDONE,
|
|
TELIF,
|
|
TELSE,
|
|
TESAC,
|
|
TFI,
|
|
TFOR,
|
|
#if BASH_FUNCTION
|
|
TFUNCTION,
|
|
#endif
|
|
TIF,
|
|
TIN,
|
|
TTHEN,
|
|
TUNTIL,
|
|
TWHILE,
|
|
TBEGIN,
|
|
TEND
|
|
};
|
|
typedef smallint token_id_t;
|
|
|
|
/* Nth bit indicates if token marks the end of a list */
|
|
enum {
|
|
tokendlist = 0
|
|
/* 0 */ | (1u << TEOF)
|
|
/* 1 */ | (0u << TNL)
|
|
/* 2 */ | (0u << TREDIR)
|
|
/* 3 */ | (0u << TWORD)
|
|
/* 4 */ | (0u << TSEMI)
|
|
/* 5 */ | (0u << TBACKGND)
|
|
/* 6 */ | (0u << TAND)
|
|
/* 7 */ | (0u << TOR)
|
|
/* 8 */ | (0u << TPIPE)
|
|
/* 9 */ | (0u << TLP)
|
|
/* 10 */ | (1u << TRP)
|
|
/* 11 */ | (1u << TENDCASE)
|
|
/* 12 */ | (1u << TENDBQUOTE)
|
|
/* 13 */ | (0u << TNOT)
|
|
/* 14 */ | (0u << TCASE)
|
|
/* 15 */ | (1u << TDO)
|
|
/* 16 */ | (1u << TDONE)
|
|
/* 17 */ | (1u << TELIF)
|
|
/* 18 */ | (1u << TELSE)
|
|
/* 19 */ | (1u << TESAC)
|
|
/* 20 */ | (1u << TFI)
|
|
/* 21 */ | (0u << TFOR)
|
|
#if BASH_FUNCTION
|
|
/* 22 */ | (0u << TFUNCTION)
|
|
#endif
|
|
/* 23 */ | (0u << TIF)
|
|
/* 24 */ | (0u << TIN)
|
|
/* 25 */ | (1u << TTHEN)
|
|
/* 26 */ | (0u << TUNTIL)
|
|
/* 27 */ | (0u << TWHILE)
|
|
/* 28 */ | (0u << TBEGIN)
|
|
/* 29 */ | (1u << TEND)
|
|
, /* thus far 29 bits used */
|
|
};
|
|
|
|
static const char *const tokname_array[] = {
|
|
"end of file",
|
|
"newline",
|
|
"redirection",
|
|
"word",
|
|
";",
|
|
"&",
|
|
"&&",
|
|
"||",
|
|
"|",
|
|
"(",
|
|
")",
|
|
";;",
|
|
"`",
|
|
#define KWDOFFSET 13
|
|
/* the following are keywords */
|
|
"!",
|
|
"case",
|
|
"do",
|
|
"done",
|
|
"elif",
|
|
"else",
|
|
"esac",
|
|
"fi",
|
|
"for",
|
|
#if BASH_FUNCTION
|
|
"function",
|
|
#endif
|
|
"if",
|
|
"in",
|
|
"then",
|
|
"until",
|
|
"while",
|
|
"{",
|
|
"}",
|
|
};
|
|
|
|
/* Wrapper around strcmp for qsort/bsearch/... */
|
|
static int
|
|
pstrcmp(const void *a, const void *b)
|
|
{
|
|
return strcmp((char*)a, *(char**)b);
|
|
}
|
|
|
|
static const char *const *
|
|
findkwd(const char *s)
|
|
{
|
|
return bsearch(s, tokname_array + KWDOFFSET,
|
|
ARRAY_SIZE(tokname_array) - KWDOFFSET,
|
|
sizeof(tokname_array[0]), pstrcmp);
|
|
}
|
|
|
|
/*
|
|
* Locate and print what a word is...
|
|
*/
|
|
static int
|
|
describe_command(char *command, const char *path, int describe_command_verbose)
|
|
{
|
|
struct cmdentry entry;
|
|
#if ENABLE_ASH_ALIAS
|
|
const struct alias *ap;
|
|
#endif
|
|
|
|
path = path ? path : pathval();
|
|
|
|
if (describe_command_verbose) {
|
|
out1str(command);
|
|
}
|
|
|
|
/* First look at the keywords */
|
|
if (findkwd(command)) {
|
|
out1str(describe_command_verbose ? " is a shell keyword" : command);
|
|
goto out;
|
|
}
|
|
|
|
#if ENABLE_ASH_ALIAS
|
|
/* Then look at the aliases */
|
|
ap = lookupalias(command, 0);
|
|
if (ap != NULL) {
|
|
if (!describe_command_verbose) {
|
|
out1str("alias ");
|
|
printalias(ap);
|
|
return 0;
|
|
}
|
|
out1fmt(" is an alias for %s", ap->val);
|
|
goto out;
|
|
}
|
|
#endif
|
|
/* Brute force */
|
|
find_command(command, &entry, DO_ABS, path);
|
|
|
|
switch (entry.cmdtype) {
|
|
case CMDNORMAL: {
|
|
int j = entry.u.index;
|
|
char *p;
|
|
if (j < 0) {
|
|
p = command;
|
|
} else {
|
|
do {
|
|
p = path_advance(&path, command);
|
|
stunalloc(p);
|
|
} while (--j >= 0);
|
|
}
|
|
if (describe_command_verbose) {
|
|
out1fmt(" is %s", p);
|
|
} else {
|
|
out1str(p);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case CMDFUNCTION:
|
|
if (describe_command_verbose) {
|
|
/*out1str(" is a shell function");*/
|
|
out1str(" is a function"); /* bash says this */
|
|
} else {
|
|
out1str(command);
|
|
}
|
|
break;
|
|
|
|
case CMDBUILTIN:
|
|
if (describe_command_verbose) {
|
|
out1fmt(" is a %sshell builtin",
|
|
IS_BUILTIN_SPECIAL(entry.u.cmd) ?
|
|
"special " : nullstr
|
|
);
|
|
} else {
|
|
out1str(command);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
if (describe_command_verbose) {
|
|
out1str(": not found\n");
|
|
}
|
|
return 127;
|
|
}
|
|
out:
|
|
out1str("\n");
|
|
return 0;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
typecmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
int i = 1;
|
|
int err = 0;
|
|
int verbose = 1;
|
|
|
|
/* type -p ... ? (we don't bother checking for 'p') */
|
|
if (argv[1] && argv[1][0] == '-') {
|
|
i++;
|
|
verbose = 0;
|
|
}
|
|
while (argv[i]) {
|
|
err |= describe_command(argv[i++], NULL, verbose);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#if ENABLE_ASH_CMDCMD
|
|
/* Is it "command [-p] PROG ARGS" bltin, no other opts? Return ptr to "PROG" if yes */
|
|
static char **
|
|
parse_command_args(char **argv, const char **path)
|
|
{
|
|
char *cp, c;
|
|
|
|
for (;;) {
|
|
cp = *++argv;
|
|
if (!cp)
|
|
return NULL;
|
|
if (*cp++ != '-')
|
|
break;
|
|
c = *cp++;
|
|
if (!c)
|
|
break;
|
|
if (c == '-' && !*cp) {
|
|
if (!*++argv)
|
|
return NULL;
|
|
break;
|
|
}
|
|
do {
|
|
switch (c) {
|
|
case 'p':
|
|
*path = bb_default_path;
|
|
break;
|
|
default:
|
|
/* run 'typecmd' for other options */
|
|
return NULL;
|
|
}
|
|
c = *cp++;
|
|
} while (c);
|
|
}
|
|
return argv;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
char *cmd;
|
|
int c;
|
|
enum {
|
|
VERIFY_BRIEF = 1,
|
|
VERIFY_VERBOSE = 2,
|
|
} verify = 0;
|
|
const char *path = NULL;
|
|
|
|
/* "command [-p] PROG ARGS" (that is, without -V or -v)
|
|
* never reaches this function.
|
|
*/
|
|
|
|
while ((c = nextopt("pvV")) != '\0')
|
|
if (c == 'V')
|
|
verify |= VERIFY_VERBOSE;
|
|
else if (c == 'v')
|
|
/*verify |= VERIFY_BRIEF*/;
|
|
#if DEBUG
|
|
else if (c != 'p')
|
|
abort();
|
|
#endif
|
|
else
|
|
path = bb_default_path;
|
|
|
|
/* Mimic bash: just "command -v" doesn't complain, it's a nop */
|
|
cmd = *argptr;
|
|
if (/*verify && */ cmd)
|
|
return describe_command(cmd, path, verify /* - VERIFY_BRIEF*/);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
/*static int funcblocksize; // size of structures in function */
|
|
/*static int funcstringsize; // size of strings in node */
|
|
static void *funcblock; /* block to allocate function from */
|
|
static char *funcstring_end; /* end of block to allocate strings from */
|
|
|
|
static const uint8_t nodesize[N_NUMBER] ALIGN1 = {
|
|
[NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
|
|
[NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
|
|
[NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
|
|
[NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
|
|
[NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
|
|
[NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
|
|
[NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
|
|
[NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
|
|
[NIF ] = SHELL_ALIGN(sizeof(struct nif)),
|
|
[NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
|
|
[NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
|
|
[NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
|
|
[NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
|
|
[NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
|
|
[NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
|
|
[NARG ] = SHELL_ALIGN(sizeof(struct narg)),
|
|
[NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
|
|
#if BASH_REDIR_OUTPUT
|
|
[NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
|
|
#endif
|
|
[NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
|
|
[NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
|
|
[NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
|
|
[NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
|
|
[NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
|
|
[NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
|
|
[NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
|
|
[NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
|
|
[NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
|
|
};
|
|
|
|
static int calcsize(int funcblocksize, union node *n);
|
|
|
|
static int
|
|
sizenodelist(int funcblocksize, struct nodelist *lp)
|
|
{
|
|
while (lp) {
|
|
funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
|
|
funcblocksize = calcsize(funcblocksize, lp->n);
|
|
lp = lp->next;
|
|
}
|
|
return funcblocksize;
|
|
}
|
|
|
|
static int
|
|
calcsize(int funcblocksize, union node *n)
|
|
{
|
|
if (n == NULL)
|
|
return funcblocksize;
|
|
funcblocksize += nodesize[n->type];
|
|
switch (n->type) {
|
|
case NCMD:
|
|
funcblocksize = calcsize(funcblocksize, n->ncmd.redirect);
|
|
funcblocksize = calcsize(funcblocksize, n->ncmd.args);
|
|
funcblocksize = calcsize(funcblocksize, n->ncmd.assign);
|
|
break;
|
|
case NPIPE:
|
|
funcblocksize = sizenodelist(funcblocksize, n->npipe.cmdlist);
|
|
break;
|
|
case NREDIR:
|
|
case NBACKGND:
|
|
case NSUBSHELL:
|
|
funcblocksize = calcsize(funcblocksize, n->nredir.redirect);
|
|
funcblocksize = calcsize(funcblocksize, n->nredir.n);
|
|
break;
|
|
case NAND:
|
|
case NOR:
|
|
case NSEMI:
|
|
case NWHILE:
|
|
case NUNTIL:
|
|
funcblocksize = calcsize(funcblocksize, n->nbinary.ch2);
|
|
funcblocksize = calcsize(funcblocksize, n->nbinary.ch1);
|
|
break;
|
|
case NIF:
|
|
funcblocksize = calcsize(funcblocksize, n->nif.elsepart);
|
|
funcblocksize = calcsize(funcblocksize, n->nif.ifpart);
|
|
funcblocksize = calcsize(funcblocksize, n->nif.test);
|
|
break;
|
|
case NFOR:
|
|
funcblocksize += SHELL_ALIGN(strlen(n->nfor.var) + 1); /* was funcstringsize += ... */
|
|
funcblocksize = calcsize(funcblocksize, n->nfor.body);
|
|
funcblocksize = calcsize(funcblocksize, n->nfor.args);
|
|
break;
|
|
case NCASE:
|
|
funcblocksize = calcsize(funcblocksize, n->ncase.cases);
|
|
funcblocksize = calcsize(funcblocksize, n->ncase.expr);
|
|
break;
|
|
case NCLIST:
|
|
funcblocksize = calcsize(funcblocksize, n->nclist.body);
|
|
funcblocksize = calcsize(funcblocksize, n->nclist.pattern);
|
|
funcblocksize = calcsize(funcblocksize, n->nclist.next);
|
|
break;
|
|
case NDEFUN:
|
|
funcblocksize = calcsize(funcblocksize, n->ndefun.body);
|
|
funcblocksize += SHELL_ALIGN(strlen(n->ndefun.text) + 1);
|
|
break;
|
|
case NARG:
|
|
funcblocksize = sizenodelist(funcblocksize, n->narg.backquote);
|
|
funcblocksize += SHELL_ALIGN(strlen(n->narg.text) + 1); /* was funcstringsize += ... */
|
|
funcblocksize = calcsize(funcblocksize, n->narg.next);
|
|
break;
|
|
case NTO:
|
|
#if BASH_REDIR_OUTPUT
|
|
case NTO2:
|
|
#endif
|
|
case NCLOBBER:
|
|
case NFROM:
|
|
case NFROMTO:
|
|
case NAPPEND:
|
|
funcblocksize = calcsize(funcblocksize, n->nfile.fname);
|
|
funcblocksize = calcsize(funcblocksize, n->nfile.next);
|
|
break;
|
|
case NTOFD:
|
|
case NFROMFD:
|
|
funcblocksize = calcsize(funcblocksize, n->ndup.vname);
|
|
funcblocksize = calcsize(funcblocksize, n->ndup.next);
|
|
break;
|
|
case NHERE:
|
|
case NXHERE:
|
|
funcblocksize = calcsize(funcblocksize, n->nhere.doc);
|
|
funcblocksize = calcsize(funcblocksize, n->nhere.next);
|
|
break;
|
|
case NNOT:
|
|
funcblocksize = calcsize(funcblocksize, n->nnot.com);
|
|
break;
|
|
};
|
|
return funcblocksize;
|
|
}
|
|
|
|
static char *
|
|
nodeckstrdup(char *s)
|
|
{
|
|
funcstring_end -= SHELL_ALIGN(strlen(s) + 1);
|
|
return strcpy(funcstring_end, s);
|
|
}
|
|
|
|
static union node *copynode(union node *);
|
|
|
|
static struct nodelist *
|
|
copynodelist(struct nodelist *lp)
|
|
{
|
|
struct nodelist *start;
|
|
struct nodelist **lpp;
|
|
|
|
lpp = &start;
|
|
while (lp) {
|
|
*lpp = funcblock;
|
|
funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
|
|
(*lpp)->n = copynode(lp->n);
|
|
lp = lp->next;
|
|
lpp = &(*lpp)->next;
|
|
}
|
|
*lpp = NULL;
|
|
return start;
|
|
}
|
|
|
|
static union node *
|
|
copynode(union node *n)
|
|
{
|
|
union node *new;
|
|
|
|
if (n == NULL)
|
|
return NULL;
|
|
new = funcblock;
|
|
funcblock = (char *) funcblock + nodesize[n->type];
|
|
|
|
switch (n->type) {
|
|
case NCMD:
|
|
new->ncmd.redirect = copynode(n->ncmd.redirect);
|
|
new->ncmd.args = copynode(n->ncmd.args);
|
|
new->ncmd.assign = copynode(n->ncmd.assign);
|
|
new->ncmd.linno = n->ncmd.linno;
|
|
break;
|
|
case NPIPE:
|
|
new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
|
|
new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
|
|
break;
|
|
case NREDIR:
|
|
case NBACKGND:
|
|
case NSUBSHELL:
|
|
new->nredir.redirect = copynode(n->nredir.redirect);
|
|
new->nredir.n = copynode(n->nredir.n);
|
|
new->nredir.linno = n->nredir.linno;
|
|
break;
|
|
case NAND:
|
|
case NOR:
|
|
case NSEMI:
|
|
case NWHILE:
|
|
case NUNTIL:
|
|
new->nbinary.ch2 = copynode(n->nbinary.ch2);
|
|
new->nbinary.ch1 = copynode(n->nbinary.ch1);
|
|
break;
|
|
case NIF:
|
|
new->nif.elsepart = copynode(n->nif.elsepart);
|
|
new->nif.ifpart = copynode(n->nif.ifpart);
|
|
new->nif.test = copynode(n->nif.test);
|
|
break;
|
|
case NFOR:
|
|
new->nfor.var = nodeckstrdup(n->nfor.var);
|
|
new->nfor.body = copynode(n->nfor.body);
|
|
new->nfor.args = copynode(n->nfor.args);
|
|
new->nfor.linno = n->nfor.linno;
|
|
break;
|
|
case NCASE:
|
|
new->ncase.cases = copynode(n->ncase.cases);
|
|
new->ncase.expr = copynode(n->ncase.expr);
|
|
new->ncase.linno = n->ncase.linno;
|
|
break;
|
|
case NCLIST:
|
|
new->nclist.body = copynode(n->nclist.body);
|
|
new->nclist.pattern = copynode(n->nclist.pattern);
|
|
new->nclist.next = copynode(n->nclist.next);
|
|
break;
|
|
case NDEFUN:
|
|
new->ndefun.body = copynode(n->ndefun.body);
|
|
new->ndefun.text = nodeckstrdup(n->ndefun.text);
|
|
new->ndefun.linno = n->ndefun.linno;
|
|
break;
|
|
case NARG:
|
|
new->narg.backquote = copynodelist(n->narg.backquote);
|
|
new->narg.text = nodeckstrdup(n->narg.text);
|
|
new->narg.next = copynode(n->narg.next);
|
|
break;
|
|
case NTO:
|
|
#if BASH_REDIR_OUTPUT
|
|
case NTO2:
|
|
#endif
|
|
case NCLOBBER:
|
|
case NFROM:
|
|
case NFROMTO:
|
|
case NAPPEND:
|
|
new->nfile.fname = copynode(n->nfile.fname);
|
|
new->nfile.fd = n->nfile.fd;
|
|
new->nfile.next = copynode(n->nfile.next);
|
|
break;
|
|
case NTOFD:
|
|
case NFROMFD:
|
|
new->ndup.vname = copynode(n->ndup.vname);
|
|
new->ndup.dupfd = n->ndup.dupfd;
|
|
new->ndup.fd = n->ndup.fd;
|
|
new->ndup.next = copynode(n->ndup.next);
|
|
break;
|
|
case NHERE:
|
|
case NXHERE:
|
|
new->nhere.doc = copynode(n->nhere.doc);
|
|
new->nhere.fd = n->nhere.fd;
|
|
new->nhere.next = copynode(n->nhere.next);
|
|
break;
|
|
case NNOT:
|
|
new->nnot.com = copynode(n->nnot.com);
|
|
break;
|
|
};
|
|
new->type = n->type;
|
|
return new;
|
|
}
|
|
|
|
/*
|
|
* Make a copy of a parse tree.
|
|
*/
|
|
static struct funcnode *
|
|
copyfunc(union node *n)
|
|
{
|
|
struct funcnode *f;
|
|
size_t blocksize;
|
|
|
|
/*funcstringsize = 0;*/
|
|
blocksize = offsetof(struct funcnode, n) + calcsize(0, n);
|
|
f = ckzalloc(blocksize /* + funcstringsize */);
|
|
funcblock = (char *) f + offsetof(struct funcnode, n);
|
|
funcstring_end = (char *) f + blocksize;
|
|
copynode(n);
|
|
/* f->count = 0; - ckzalloc did it */
|
|
return f;
|
|
}
|
|
|
|
/*
|
|
* Define a shell function.
|
|
*/
|
|
static void
|
|
defun(union node *func)
|
|
{
|
|
struct cmdentry entry;
|
|
|
|
INT_OFF;
|
|
entry.cmdtype = CMDFUNCTION;
|
|
entry.u.func = copyfunc(func);
|
|
addcmdentry(func->ndefun.text, &entry);
|
|
INT_ON;
|
|
}
|
|
|
|
/* Reasons for skipping commands (see comment on breakcmd routine) */
|
|
#define SKIPBREAK (1 << 0)
|
|
#define SKIPCONT (1 << 1)
|
|
#define SKIPFUNC (1 << 2)
|
|
static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
|
|
static int skipcount; /* number of levels to skip */
|
|
static int loopnest; /* current loop nesting level */
|
|
static int funcline; /* starting line number of current function, or 0 if not in a function */
|
|
|
|
/* Forward decl way out to parsing code - dotrap needs it */
|
|
static int evalstring(char *s, int flags);
|
|
|
|
/* Called to execute a trap.
|
|
* Single callsite - at the end of evaltree().
|
|
* If we return non-zero, evaltree raises EXEXIT exception.
|
|
*
|
|
* Perhaps we should avoid entering new trap handlers
|
|
* while we are executing a trap handler. [is it a TODO?]
|
|
*/
|
|
static void
|
|
dotrap(void)
|
|
{
|
|
uint8_t *g;
|
|
int sig;
|
|
uint8_t last_status;
|
|
|
|
if (!pending_sig)
|
|
return;
|
|
|
|
last_status = exitstatus;
|
|
pending_sig = 0;
|
|
barrier();
|
|
|
|
TRACE(("dotrap entered\n"));
|
|
for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
|
|
char *p;
|
|
|
|
if (!*g)
|
|
continue;
|
|
|
|
if (evalskip) {
|
|
pending_sig = sig;
|
|
break;
|
|
}
|
|
|
|
p = trap[sig];
|
|
/* non-trapped SIGINT is handled separately by raise_interrupt,
|
|
* don't upset it by resetting gotsig[SIGINT-1] */
|
|
if (sig == SIGINT && !p)
|
|
continue;
|
|
|
|
TRACE(("sig %d is active, will run handler '%s'\n", sig, p));
|
|
*g = 0;
|
|
if (!p)
|
|
continue;
|
|
evalstring(p, 0);
|
|
}
|
|
exitstatus = last_status;
|
|
TRACE(("dotrap returns\n"));
|
|
}
|
|
|
|
/* forward declarations - evaluation is fairly recursive business... */
|
|
static int evalloop(union node *, int);
|
|
static int evalfor(union node *, int);
|
|
static int evalcase(union node *, int);
|
|
static int evalsubshell(union node *, int);
|
|
static void expredir(union node *);
|
|
static int evalpipe(union node *, int);
|
|
static int evalcommand(union node *, int);
|
|
static int evalbltin(const struct builtincmd *, int, char **, int);
|
|
static void prehash(union node *);
|
|
|
|
/*
|
|
* Evaluate a parse tree. The value is left in the global variable
|
|
* exitstatus.
|
|
*/
|
|
static int
|
|
evaltree(union node *n, int flags)
|
|
{
|
|
int checkexit = 0;
|
|
int (*evalfn)(union node *, int);
|
|
struct stackmark smark;
|
|
int status = 0;
|
|
|
|
setstackmark(&smark);
|
|
|
|
if (n == NULL) {
|
|
TRACE(("evaltree(NULL) called\n"));
|
|
goto out;
|
|
}
|
|
TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
|
|
|
|
dotrap();
|
|
|
|
switch (n->type) {
|
|
default:
|
|
#if DEBUG
|
|
out1fmt("Node type = %d\n", n->type);
|
|
fflush_all();
|
|
break;
|
|
#endif
|
|
case NNOT:
|
|
status = !evaltree(n->nnot.com, EV_TESTED);
|
|
goto setstatus;
|
|
case NREDIR:
|
|
errlinno = lineno = n->nredir.linno;
|
|
if (funcline)
|
|
lineno -= funcline - 1;
|
|
expredir(n->nredir.redirect);
|
|
pushredir(n->nredir.redirect);
|
|
status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
|
|
if (!status) {
|
|
status = evaltree(n->nredir.n, flags & EV_TESTED);
|
|
}
|
|
if (n->nredir.redirect)
|
|
popredir(/*drop:*/ 0);
|
|
goto setstatus;
|
|
case NCMD:
|
|
evalfn = evalcommand;
|
|
checkexit:
|
|
if (eflag && !(flags & EV_TESTED))
|
|
checkexit = ~0;
|
|
goto calleval;
|
|
case NFOR:
|
|
evalfn = evalfor;
|
|
goto calleval;
|
|
case NWHILE:
|
|
case NUNTIL:
|
|
evalfn = evalloop;
|
|
goto calleval;
|
|
case NSUBSHELL:
|
|
case NBACKGND:
|
|
evalfn = evalsubshell;
|
|
goto checkexit;
|
|
case NPIPE:
|
|
evalfn = evalpipe;
|
|
goto checkexit;
|
|
case NCASE:
|
|
evalfn = evalcase;
|
|
goto calleval;
|
|
case NAND:
|
|
case NOR:
|
|
case NSEMI: {
|
|
|
|
#if NAND + 1 != NOR
|
|
#error NAND + 1 != NOR
|
|
#endif
|
|
#if NOR + 1 != NSEMI
|
|
#error NOR + 1 != NSEMI
|
|
#endif
|
|
unsigned is_or = n->type - NAND;
|
|
status = evaltree(
|
|
n->nbinary.ch1,
|
|
(flags | ((is_or >> 1) - 1)) & EV_TESTED
|
|
);
|
|
if ((!status) == is_or || evalskip)
|
|
break;
|
|
n = n->nbinary.ch2;
|
|
evaln:
|
|
evalfn = evaltree;
|
|
calleval:
|
|
status = evalfn(n, flags);
|
|
goto setstatus;
|
|
}
|
|
case NIF:
|
|
status = evaltree(n->nif.test, EV_TESTED);
|
|
if (evalskip)
|
|
break;
|
|
if (!status) {
|
|
n = n->nif.ifpart;
|
|
goto evaln;
|
|
}
|
|
if (n->nif.elsepart) {
|
|
n = n->nif.elsepart;
|
|
goto evaln;
|
|
}
|
|
status = 0;
|
|
goto setstatus;
|
|
case NDEFUN:
|
|
defun(n);
|
|
/* Not necessary. To test it:
|
|
* "false; f() { qwerty; }; echo $?" should print 0.
|
|
*/
|
|
/* status = 0; */
|
|
setstatus:
|
|
exitstatus = status;
|
|
break;
|
|
}
|
|
out:
|
|
/* Order of checks below is important:
|
|
* signal handlers trigger before exit caused by "set -e".
|
|
*/
|
|
dotrap();
|
|
|
|
if (checkexit & status)
|
|
raise_exception(EXEXIT);
|
|
if (flags & EV_EXIT)
|
|
raise_exception(EXEXIT);
|
|
|
|
popstackmark(&smark);
|
|
TRACE(("leaving evaltree (no interrupts)\n"));
|
|
return exitstatus;
|
|
}
|
|
|
|
static int
|
|
skiploop(void)
|
|
{
|
|
int skip = evalskip;
|
|
|
|
switch (skip) {
|
|
case 0:
|
|
break;
|
|
case SKIPBREAK:
|
|
case SKIPCONT:
|
|
if (--skipcount <= 0) {
|
|
evalskip = 0;
|
|
break;
|
|
}
|
|
skip = SKIPBREAK;
|
|
break;
|
|
}
|
|
return skip;
|
|
}
|
|
|
|
static int
|
|
evalloop(union node *n, int flags)
|
|
{
|
|
int skip;
|
|
int status;
|
|
|
|
loopnest++;
|
|
status = 0;
|
|
flags &= EV_TESTED;
|
|
do {
|
|
int i;
|
|
|
|
i = evaltree(n->nbinary.ch1, EV_TESTED);
|
|
skip = skiploop();
|
|
if (skip == SKIPFUNC)
|
|
status = i;
|
|
if (skip)
|
|
continue;
|
|
if (n->type != NWHILE)
|
|
i = !i;
|
|
if (i != 0)
|
|
break;
|
|
status = evaltree(n->nbinary.ch2, flags);
|
|
skip = skiploop();
|
|
} while (!(skip & ~SKIPCONT));
|
|
loopnest--;
|
|
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
evalfor(union node *n, int flags)
|
|
{
|
|
struct arglist arglist;
|
|
union node *argp;
|
|
struct strlist *sp;
|
|
int status = 0;
|
|
|
|
errlinno = lineno = n->ncase.linno;
|
|
if (funcline)
|
|
lineno -= funcline - 1;
|
|
|
|
arglist.list = NULL;
|
|
arglist.lastp = &arglist.list;
|
|
for (argp = n->nfor.args; argp; argp = argp->narg.next) {
|
|
expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
|
|
}
|
|
*arglist.lastp = NULL;
|
|
|
|
loopnest++;
|
|
flags &= EV_TESTED;
|
|
for (sp = arglist.list; sp; sp = sp->next) {
|
|
setvar0(n->nfor.var, sp->text);
|
|
status = evaltree(n->nfor.body, flags);
|
|
if (skiploop() & ~SKIPCONT)
|
|
break;
|
|
}
|
|
loopnest--;
|
|
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
evalcase(union node *n, int flags)
|
|
{
|
|
union node *cp;
|
|
union node *patp;
|
|
struct arglist arglist;
|
|
int status = 0;
|
|
|
|
errlinno = lineno = n->ncase.linno;
|
|
if (funcline)
|
|
lineno -= funcline - 1;
|
|
|
|
arglist.list = NULL;
|
|
arglist.lastp = &arglist.list;
|
|
expandarg(n->ncase.expr, &arglist, EXP_TILDE);
|
|
for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
|
|
for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
|
|
if (casematch(patp, arglist.list->text)) {
|
|
/* Ensure body is non-empty as otherwise
|
|
* EV_EXIT may prevent us from setting the
|
|
* exit status.
|
|
*/
|
|
if (evalskip == 0 && cp->nclist.body) {
|
|
status = evaltree(cp->nclist.body, flags);
|
|
}
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Kick off a subshell to evaluate a tree.
|
|
*/
|
|
static int
|
|
evalsubshell(union node *n, int flags)
|
|
{
|
|
struct job *jp;
|
|
int backgnd = (n->type == NBACKGND); /* FORK_BG(1) if yes, else FORK_FG(0) */
|
|
int status;
|
|
|
|
errlinno = lineno = n->nredir.linno;
|
|
if (funcline)
|
|
lineno -= funcline - 1;
|
|
|
|
expredir(n->nredir.redirect);
|
|
if (!backgnd && (flags & EV_EXIT) && !may_have_traps)
|
|
goto nofork;
|
|
INT_OFF;
|
|
if (backgnd == FORK_FG)
|
|
get_tty_state();
|
|
jp = makejob(/*n,*/ 1);
|
|
if (forkshell(jp, n, backgnd) == 0) {
|
|
/* child */
|
|
INT_ON;
|
|
flags |= EV_EXIT;
|
|
if (backgnd)
|
|
flags &= ~EV_TESTED;
|
|
nofork:
|
|
redirect(n->nredir.redirect, 0);
|
|
evaltreenr(n->nredir.n, flags);
|
|
/* never returns */
|
|
}
|
|
/* parent */
|
|
status = 0;
|
|
if (backgnd == FORK_FG)
|
|
status = waitforjob(jp);
|
|
INT_ON;
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Compute the names of the files in a redirection list.
|
|
*/
|
|
static void fixredir(union node *, const char *, int);
|
|
static void
|
|
expredir(union node *n)
|
|
{
|
|
union node *redir;
|
|
|
|
for (redir = n; redir; redir = redir->nfile.next) {
|
|
struct arglist fn;
|
|
|
|
fn.list = NULL;
|
|
fn.lastp = &fn.list;
|
|
switch (redir->type) {
|
|
case NFROMTO:
|
|
case NFROM:
|
|
case NTO:
|
|
#if BASH_REDIR_OUTPUT
|
|
case NTO2:
|
|
#endif
|
|
case NCLOBBER:
|
|
case NAPPEND:
|
|
expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
|
|
TRACE(("expredir expanded to '%s'\n", fn.list->text));
|
|
#if BASH_REDIR_OUTPUT
|
|
store_expfname:
|
|
#endif
|
|
#if 0
|
|
// By the design of stack allocator, the loop of this kind:
|
|
// while true; do while true; do break; done </dev/null; done
|
|
// will look like a memory leak: ash plans to free expfname's
|
|
// of "/dev/null" as soon as it finishes running the loop
|
|
// (in this case, never).
|
|
// This "fix" is wrong:
|
|
if (redir->nfile.expfname)
|
|
stunalloc(redir->nfile.expfname);
|
|
// It results in corrupted state of stacked allocations.
|
|
#endif
|
|
redir->nfile.expfname = fn.list->text;
|
|
break;
|
|
case NFROMFD:
|
|
case NTOFD: /* >& */
|
|
if (redir->ndup.vname) {
|
|
expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
|
|
if (fn.list == NULL)
|
|
ash_msg_and_raise_error("redir error");
|
|
#if BASH_REDIR_OUTPUT
|
|
//FIXME: we used expandarg with different args!
|
|
if (!isdigit_str9(fn.list->text)) {
|
|
/* >&file, not >&fd */
|
|
if (redir->nfile.fd != 1) /* 123>&file - BAD */
|
|
ash_msg_and_raise_error("redir error");
|
|
redir->type = NTO2;
|
|
goto store_expfname;
|
|
}
|
|
#endif
|
|
fixredir(redir, fn.list->text, 1);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Evaluate a pipeline. All the processes in the pipeline are children
|
|
* of the process creating the pipeline. (This differs from some versions
|
|
* of the shell, which make the last process in a pipeline the parent
|
|
* of all the rest.)
|
|
*/
|
|
static int
|
|
evalpipe(union node *n, int flags)
|
|
{
|
|
struct job *jp;
|
|
struct nodelist *lp;
|
|
int pipelen;
|
|
int prevfd;
|
|
int pip[2];
|
|
int status = 0;
|
|
|
|
TRACE(("evalpipe(0x%lx) called\n", (long)n));
|
|
pipelen = 0;
|
|
for (lp = n->npipe.cmdlist; lp; lp = lp->next)
|
|
pipelen++;
|
|
flags |= EV_EXIT;
|
|
INT_OFF;
|
|
if (n->npipe.pipe_backgnd == 0)
|
|
get_tty_state();
|
|
jp = makejob(/*n,*/ pipelen);
|
|
prevfd = -1;
|
|
for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
|
|
prehash(lp->n);
|
|
pip[1] = -1;
|
|
if (lp->next) {
|
|
if (pipe(pip) < 0) {
|
|
close(prevfd);
|
|
ash_msg_and_raise_perror("can't create pipe");
|
|
}
|
|
}
|
|
if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
|
|
/* child */
|
|
INT_ON;
|
|
if (pip[1] >= 0) {
|
|
close(pip[0]);
|
|
}
|
|
if (prevfd > 0) {
|
|
dup2(prevfd, 0);
|
|
close(prevfd);
|
|
}
|
|
if (pip[1] > 1) {
|
|
dup2(pip[1], 1);
|
|
close(pip[1]);
|
|
}
|
|
evaltreenr(lp->n, flags);
|
|
/* never returns */
|
|
}
|
|
/* parent */
|
|
if (prevfd >= 0)
|
|
close(prevfd);
|
|
prevfd = pip[0];
|
|
/* Don't want to trigger debugging */
|
|
if (pip[1] != -1)
|
|
close(pip[1]);
|
|
}
|
|
if (n->npipe.pipe_backgnd == 0) {
|
|
status = waitforjob(jp);
|
|
TRACE(("evalpipe: job done exit status %d\n", status));
|
|
}
|
|
INT_ON;
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Controls whether the shell is interactive or not.
|
|
*/
|
|
static void
|
|
setinteractive(int on)
|
|
{
|
|
static smallint is_interactive;
|
|
|
|
if (++on == is_interactive)
|
|
return;
|
|
is_interactive = on;
|
|
setsignal(SIGINT);
|
|
setsignal(SIGQUIT);
|
|
setsignal(SIGTERM);
|
|
if (is_interactive > 1) {
|
|
#if !ENABLE_FEATURE_SH_EXTRA_QUIET
|
|
/* Looks like they want an interactive shell */
|
|
static smallint did_banner;
|
|
|
|
if (!did_banner) {
|
|
/* note: ash and hush share this string */
|
|
out1fmt("\n\n%s %s\n"
|
|
IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n")
|
|
"\n",
|
|
bb_banner,
|
|
"built-in shell (ash)"
|
|
);
|
|
did_banner = 1;
|
|
}
|
|
#endif
|
|
#if ENABLE_FEATURE_EDITING
|
|
if (!line_input_state)
|
|
line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static void
|
|
optschanged(void)
|
|
{
|
|
#if DEBUG
|
|
opentrace();
|
|
#endif
|
|
setinteractive(iflag);
|
|
setjobctl(mflag);
|
|
#if ENABLE_FEATURE_EDITING_VI
|
|
if (line_input_state) {
|
|
if (viflag)
|
|
line_input_state->flags |= VI_MODE;
|
|
else
|
|
line_input_state->flags &= ~VI_MODE;
|
|
}
|
|
#else
|
|
viflag = 0; /* forcibly keep the option off */
|
|
#endif
|
|
}
|
|
|
|
struct localvar_list {
|
|
struct localvar_list *next;
|
|
struct localvar *lv;
|
|
};
|
|
|
|
static struct localvar_list *localvar_stack;
|
|
|
|
/*
|
|
* Called after a function returns.
|
|
* Interrupts must be off.
|
|
*/
|
|
static void
|
|
poplocalvars(int keep)
|
|
{
|
|
struct localvar_list *ll;
|
|
struct localvar *lvp, *next;
|
|
struct var *vp;
|
|
|
|
INT_OFF;
|
|
ll = localvar_stack;
|
|
localvar_stack = ll->next;
|
|
|
|
next = ll->lv;
|
|
free(ll);
|
|
|
|
while ((lvp = next) != NULL) {
|
|
next = lvp->next;
|
|
vp = lvp->vp;
|
|
TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
|
|
if (keep) {
|
|
int bits = VSTRFIXED;
|
|
|
|
if (lvp->flags != VUNSET) {
|
|
if (vp->var_text == lvp->text)
|
|
bits |= VTEXTFIXED;
|
|
else if (!(lvp->flags & (VTEXTFIXED|VSTACK)))
|
|
free((char*)lvp->text);
|
|
}
|
|
|
|
vp->flags &= ~bits;
|
|
vp->flags |= (lvp->flags & bits);
|
|
|
|
if ((vp->flags &
|
|
(VEXPORT|VREADONLY|VSTRFIXED|VUNSET)) == VUNSET)
|
|
unsetvar(vp->var_text);
|
|
} else if (vp == NULL) { /* $- saved */
|
|
memcpy(optlist, lvp->text, sizeof(optlist));
|
|
free((char*)lvp->text);
|
|
optschanged();
|
|
} else if (lvp->flags == VUNSET) {
|
|
vp->flags &= ~(VSTRFIXED|VREADONLY);
|
|
unsetvar(vp->var_text);
|
|
} else {
|
|
if (vp->var_func)
|
|
vp->var_func(var_end(lvp->text));
|
|
if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
|
|
free((char*)vp->var_text);
|
|
vp->flags = lvp->flags;
|
|
vp->var_text = lvp->text;
|
|
}
|
|
free(lvp);
|
|
}
|
|
INT_ON;
|
|
}
|
|
|
|
/*
|
|
* Create a new localvar environment.
|
|
*/
|
|
static struct localvar_list *
|
|
pushlocalvars(void)
|
|
{
|
|
struct localvar_list *ll;
|
|
|
|
INT_OFF;
|
|
ll = ckzalloc(sizeof(*ll));
|
|
/*ll->lv = NULL; - zalloc did it */
|
|
ll->next = localvar_stack;
|
|
localvar_stack = ll;
|
|
INT_ON;
|
|
|
|
return ll->next;
|
|
}
|
|
|
|
static void
|
|
unwindlocalvars(struct localvar_list *stop)
|
|
{
|
|
while (localvar_stack != stop)
|
|
poplocalvars(0);
|
|
}
|
|
|
|
static int
|
|
evalfun(struct funcnode *func, int argc, char **argv, int flags)
|
|
{
|
|
volatile struct shparam saveparam;
|
|
struct jmploc *volatile savehandler;
|
|
struct jmploc jmploc;
|
|
int e;
|
|
int savefuncline;
|
|
|
|
saveparam = shellparam;
|
|
savefuncline = funcline;
|
|
savehandler = exception_handler;
|
|
e = setjmp(jmploc.loc);
|
|
if (e) {
|
|
goto funcdone;
|
|
}
|
|
INT_OFF;
|
|
exception_handler = &jmploc;
|
|
shellparam.malloced = 0;
|
|
func->count++;
|
|
funcline = func->n.ndefun.linno;
|
|
INT_ON;
|
|
shellparam.nparam = argc - 1;
|
|
shellparam.p = argv + 1;
|
|
#if ENABLE_ASH_GETOPTS
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
#endif
|
|
evaltree(func->n.ndefun.body, flags & EV_TESTED);
|
|
funcdone:
|
|
INT_OFF;
|
|
funcline = savefuncline;
|
|
freefunc(func);
|
|
freeparam(&shellparam);
|
|
shellparam = saveparam;
|
|
exception_handler = savehandler;
|
|
INT_ON;
|
|
evalskip &= ~SKIPFUNC;
|
|
return e;
|
|
}
|
|
|
|
/*
|
|
* Make a variable a local variable. When a variable is made local, it's
|
|
* value and flags are saved in a localvar structure. The saved values
|
|
* will be restored when the shell function returns. We handle the name
|
|
* "-" as a special case: it makes changes to "set +-options" local
|
|
* (options will be restored on return from the function).
|
|
*/
|
|
static void
|
|
mklocal(char *name)
|
|
{
|
|
struct localvar *lvp;
|
|
struct var **vpp;
|
|
struct var *vp;
|
|
char *eq = strchr(name, '=');
|
|
|
|
INT_OFF;
|
|
/* Cater for duplicate "local". Examples:
|
|
* x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x
|
|
* x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x
|
|
*/
|
|
lvp = localvar_stack->lv;
|
|
while (lvp) {
|
|
if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) {
|
|
if (eq)
|
|
setvareq(name, 0);
|
|
/* else:
|
|
* it's a duplicate "local VAR" declaration, do nothing
|
|
*/
|
|
goto ret;
|
|
}
|
|
lvp = lvp->next;
|
|
}
|
|
|
|
lvp = ckzalloc(sizeof(*lvp));
|
|
if (LONE_DASH(name)) {
|
|
char *p;
|
|
p = ckmalloc(sizeof(optlist));
|
|
lvp->text = memcpy(p, optlist, sizeof(optlist));
|
|
vp = NULL;
|
|
} else {
|
|
vpp = hashvar(name);
|
|
vp = *findvar(vpp, name);
|
|
if (vp == NULL) {
|
|
/* variable did not exist yet */
|
|
if (eq)
|
|
vp = setvareq(name, VSTRFIXED);
|
|
else
|
|
vp = setvar(name, NULL, VSTRFIXED);
|
|
lvp->flags = VUNSET;
|
|
} else {
|
|
lvp->text = vp->var_text;
|
|
lvp->flags = vp->flags;
|
|
/* make sure neither "struct var" nor string gets freed
|
|
* during (un)setting:
|
|
*/
|
|
vp->flags |= VSTRFIXED|VTEXTFIXED;
|
|
if (eq)
|
|
setvareq(name, 0);
|
|
else
|
|
/* "local VAR" unsets VAR: */
|
|
setvar0(name, NULL);
|
|
}
|
|
}
|
|
lvp->vp = vp;
|
|
lvp->next = localvar_stack->lv;
|
|
localvar_stack->lv = lvp;
|
|
ret:
|
|
INT_ON;
|
|
}
|
|
|
|
/*
|
|
* The "local" command.
|
|
*/
|
|
static int FAST_FUNC
|
|
localcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
char *name;
|
|
|
|
if (!localvar_stack)
|
|
ash_msg_and_raise_error("not in a function");
|
|
|
|
argv = argptr;
|
|
while ((name = *argv++) != NULL) {
|
|
mklocal(name);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
execcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
optionarg = NULL;
|
|
while (nextopt("a:") != '\0')
|
|
/* nextopt() sets optionarg to "-a ARGV0" */;
|
|
|
|
argv = argptr;
|
|
if (argv[0]) {
|
|
char *prog;
|
|
|
|
iflag = 0; /* exit on error */
|
|
mflag = 0;
|
|
optschanged();
|
|
/* We should set up signals for "exec CMD"
|
|
* the same way as for "CMD" without "exec".
|
|
* But optschanged->setinteractive->setsignal
|
|
* still thought we are a root shell. Therefore, for example,
|
|
* SIGQUIT is still set to IGN. Fix it:
|
|
*/
|
|
shlvl++;
|
|
setsignal(SIGQUIT);
|
|
/*setsignal(SIGTERM); - unnecessary because of iflag=0 */
|
|
/*setsignal(SIGTSTP); - unnecessary because of mflag=0 */
|
|
/*setsignal(SIGTTOU); - unnecessary because of mflag=0 */
|
|
|
|
prog = argv[0];
|
|
if (optionarg)
|
|
argv[0] = optionarg;
|
|
shellexec(prog, argv, pathval(), 0);
|
|
/* NOTREACHED */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The return command.
|
|
*/
|
|
static int FAST_FUNC
|
|
returncmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
/*
|
|
* If called outside a function, do what ksh does;
|
|
* skip the rest of the file.
|
|
*/
|
|
evalskip = SKIPFUNC;
|
|
return argv[1] ? number(argv[1]) : exitstatus;
|
|
}
|
|
|
|
/* Forward declarations for builtintab[] */
|
|
static int breakcmd(int, char **) FAST_FUNC;
|
|
static int dotcmd(int, char **) FAST_FUNC;
|
|
static int evalcmd(int, char **, int) FAST_FUNC;
|
|
static int exitcmd(int, char **) FAST_FUNC;
|
|
static int exportcmd(int, char **) FAST_FUNC;
|
|
#if ENABLE_ASH_GETOPTS
|
|
static int getoptscmd(int, char **) FAST_FUNC;
|
|
#endif
|
|
#if ENABLE_ASH_HELP
|
|
static int helpcmd(int, char **) FAST_FUNC;
|
|
#endif
|
|
#if MAX_HISTORY
|
|
static int historycmd(int, char **) FAST_FUNC;
|
|
#endif
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
static int letcmd(int, char **) FAST_FUNC;
|
|
#endif
|
|
static int readcmd(int, char **) FAST_FUNC;
|
|
static int setcmd(int, char **) FAST_FUNC;
|
|
static int shiftcmd(int, char **) FAST_FUNC;
|
|
static int timescmd(int, char **) FAST_FUNC;
|
|
static int trapcmd(int, char **) FAST_FUNC;
|
|
static int umaskcmd(int, char **) FAST_FUNC;
|
|
static int unsetcmd(int, char **) FAST_FUNC;
|
|
static int ulimitcmd(int, char **) FAST_FUNC;
|
|
|
|
#define BUILTIN_NOSPEC "0"
|
|
#define BUILTIN_SPECIAL "1"
|
|
#define BUILTIN_REGULAR "2"
|
|
#define BUILTIN_SPEC_REG "3"
|
|
#define BUILTIN_ASSIGN "4"
|
|
#define BUILTIN_SPEC_ASSG "5"
|
|
#define BUILTIN_REG_ASSG "6"
|
|
#define BUILTIN_SPEC_REG_ASSG "7"
|
|
|
|
/* Stubs for calling non-FAST_FUNC's */
|
|
#if ENABLE_ASH_ECHO
|
|
static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
|
|
#endif
|
|
#if ENABLE_ASH_PRINTF
|
|
static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
|
|
#endif
|
|
#if ENABLE_ASH_TEST || BASH_TEST2
|
|
static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
|
|
#endif
|
|
|
|
/* Keep these in proper order since it is searched via bsearch() */
|
|
static const struct builtincmd builtintab[] = {
|
|
{ BUILTIN_SPEC_REG "." , dotcmd },
|
|
{ BUILTIN_SPEC_REG ":" , truecmd },
|
|
#if ENABLE_ASH_TEST
|
|
{ BUILTIN_REGULAR "[" , testcmd },
|
|
#endif
|
|
#if BASH_TEST2
|
|
{ BUILTIN_REGULAR "[[" , testcmd },
|
|
#endif
|
|
#if ENABLE_ASH_ALIAS
|
|
{ BUILTIN_REG_ASSG "alias" , aliascmd },
|
|
#endif
|
|
#if JOBS
|
|
{ BUILTIN_REGULAR "bg" , fg_bgcmd },
|
|
#endif
|
|
{ BUILTIN_SPEC_REG "break" , breakcmd },
|
|
{ BUILTIN_REGULAR "cd" , cdcmd },
|
|
{ BUILTIN_NOSPEC "chdir" , cdcmd },
|
|
#if ENABLE_ASH_CMDCMD
|
|
{ BUILTIN_REGULAR "command" , commandcmd },
|
|
#endif
|
|
{ BUILTIN_SPEC_REG "continue", breakcmd },
|
|
#if ENABLE_ASH_ECHO
|
|
{ BUILTIN_REGULAR "echo" , echocmd },
|
|
#endif
|
|
{ BUILTIN_SPEC_REG "eval" , NULL }, /*evalcmd() has a differing prototype*/
|
|
{ BUILTIN_SPEC_REG "exec" , execcmd },
|
|
{ BUILTIN_SPEC_REG "exit" , exitcmd },
|
|
{ BUILTIN_SPEC_REG_ASSG "export" , exportcmd },
|
|
{ BUILTIN_REGULAR "false" , falsecmd },
|
|
#if JOBS
|
|
{ BUILTIN_REGULAR "fg" , fg_bgcmd },
|
|
#endif
|
|
#if ENABLE_ASH_GETOPTS
|
|
{ BUILTIN_REGULAR "getopts" , getoptscmd },
|
|
#endif
|
|
{ BUILTIN_NOSPEC "hash" , hashcmd },
|
|
#if ENABLE_ASH_HELP
|
|
{ BUILTIN_NOSPEC "help" , helpcmd },
|
|
#endif
|
|
#if MAX_HISTORY
|
|
{ BUILTIN_NOSPEC "history" , historycmd },
|
|
#endif
|
|
#if JOBS
|
|
{ BUILTIN_REGULAR "jobs" , jobscmd },
|
|
{ BUILTIN_REGULAR "kill" , killcmd },
|
|
#endif
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
{ BUILTIN_NOSPEC "let" , letcmd },
|
|
#endif
|
|
{ BUILTIN_SPEC_REG_ASSG "local" , localcmd },
|
|
#if ENABLE_ASH_PRINTF
|
|
{ BUILTIN_REGULAR "printf" , printfcmd },
|
|
#endif
|
|
{ BUILTIN_NOSPEC "pwd" , pwdcmd },
|
|
{ BUILTIN_REGULAR "read" , readcmd },
|
|
{ BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
|
|
{ BUILTIN_SPEC_REG "return" , returncmd },
|
|
{ BUILTIN_SPEC_REG "set" , setcmd },
|
|
{ BUILTIN_SPEC_REG "shift" , shiftcmd },
|
|
#if BASH_SOURCE
|
|
{ BUILTIN_SPEC_REG "source" , dotcmd },
|
|
#endif
|
|
#if ENABLE_ASH_TEST
|
|
{ BUILTIN_REGULAR "test" , testcmd },
|
|
#endif
|
|
{ BUILTIN_SPEC_REG "times" , timescmd },
|
|
{ BUILTIN_SPEC_REG "trap" , trapcmd },
|
|
{ BUILTIN_REGULAR "true" , truecmd },
|
|
{ BUILTIN_NOSPEC "type" , typecmd },
|
|
{ BUILTIN_NOSPEC "ulimit" , ulimitcmd },
|
|
{ BUILTIN_REGULAR "umask" , umaskcmd },
|
|
#if ENABLE_ASH_ALIAS
|
|
{ BUILTIN_REGULAR "unalias" , unaliascmd },
|
|
#endif
|
|
{ BUILTIN_SPEC_REG "unset" , unsetcmd },
|
|
{ BUILTIN_REGULAR "wait" , waitcmd },
|
|
};
|
|
|
|
/* Should match the above table! */
|
|
#define COMMANDCMD (builtintab + \
|
|
/* . : */ 2 + \
|
|
/* [ */ 1 * ENABLE_ASH_TEST + \
|
|
/* [[ */ 1 * BASH_TEST2 + \
|
|
/* alias */ 1 * ENABLE_ASH_ALIAS + \
|
|
/* bg */ 1 * ENABLE_ASH_JOB_CONTROL + \
|
|
/* break cd cddir */ 3)
|
|
#define EVALCMD (COMMANDCMD + \
|
|
/* command */ 1 * ENABLE_ASH_CMDCMD + \
|
|
/* continue */ 1 + \
|
|
/* echo */ 1 * ENABLE_ASH_ECHO + \
|
|
0)
|
|
#define EXECCMD (EVALCMD + \
|
|
/* eval */ 1)
|
|
|
|
/*
|
|
* Search the table of builtin commands.
|
|
*/
|
|
static int
|
|
pstrcmp1(const void *a, const void *b)
|
|
{
|
|
return strcmp((char*)a, *(char**)b + 1);
|
|
}
|
|
static struct builtincmd *
|
|
find_builtin(const char *name)
|
|
{
|
|
struct builtincmd *bp;
|
|
|
|
bp = bsearch(
|
|
name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
|
|
pstrcmp1
|
|
);
|
|
return bp;
|
|
}
|
|
|
|
/*
|
|
* Execute a simple command.
|
|
*/
|
|
static void unwindfiles(struct parsefile *stop);
|
|
static int
|
|
isassignment(const char *p)
|
|
{
|
|
const char *q = endofname(p);
|
|
if (p == q)
|
|
return 0;
|
|
return *q == '=';
|
|
}
|
|
static int FAST_FUNC
|
|
bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
/* Preserve exitstatus of a previous possible redirection
|
|
* as POSIX mandates */
|
|
return back_exitstatus;
|
|
}
|
|
static int
|
|
evalcommand(union node *cmd, int flags)
|
|
{
|
|
static const struct builtincmd null_bltin = {
|
|
"\0\0", bltincmd /* why three NULs? */
|
|
};
|
|
struct localvar_list *localvar_stop;
|
|
struct parsefile *file_stop;
|
|
struct redirtab *redir_stop;
|
|
union node *argp;
|
|
struct arglist arglist;
|
|
struct arglist varlist;
|
|
char **argv;
|
|
int argc;
|
|
const struct strlist *sp;
|
|
struct cmdentry cmdentry;
|
|
struct job *jp;
|
|
char *lastarg;
|
|
const char *path;
|
|
int spclbltin;
|
|
int status;
|
|
char **nargv;
|
|
smallint cmd_is_exec;
|
|
|
|
errlinno = lineno = cmd->ncmd.linno;
|
|
if (funcline)
|
|
lineno -= funcline - 1;
|
|
|
|
/* First expand the arguments. */
|
|
TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
|
|
localvar_stop = pushlocalvars();
|
|
file_stop = g_parsefile;
|
|
back_exitstatus = 0;
|
|
|
|
cmdentry.cmdtype = CMDBUILTIN;
|
|
cmdentry.u.cmd = &null_bltin;
|
|
varlist.lastp = &varlist.list;
|
|
*varlist.lastp = NULL;
|
|
arglist.lastp = &arglist.list;
|
|
*arglist.lastp = NULL;
|
|
|
|
argc = 0;
|
|
if (cmd->ncmd.args) {
|
|
struct builtincmd *bcmd;
|
|
smallint pseudovarflag;
|
|
|
|
bcmd = find_builtin(cmd->ncmd.args->narg.text);
|
|
pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
|
|
|
|
for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
|
|
struct strlist **spp;
|
|
|
|
spp = arglist.lastp;
|
|
if (pseudovarflag && isassignment(argp->narg.text))
|
|
expandarg(argp, &arglist, EXP_VARTILDE);
|
|
else
|
|
expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
|
|
|
|
for (sp = *spp; sp; sp = sp->next)
|
|
argc++;
|
|
}
|
|
}
|
|
|
|
/* Reserve one extra spot at the front for shellexec. */
|
|
nargv = stalloc(sizeof(char *) * (argc + 2));
|
|
argv = ++nargv;
|
|
for (sp = arglist.list; sp; sp = sp->next) {
|
|
TRACE(("evalcommand arg: %s\n", sp->text));
|
|
*nargv++ = sp->text;
|
|
}
|
|
*nargv = NULL;
|
|
|
|
lastarg = NULL;
|
|
if (iflag && funcline == 0 && argc > 0)
|
|
lastarg = nargv[-1];
|
|
|
|
expredir(cmd->ncmd.redirect);
|
|
redir_stop = pushredir(cmd->ncmd.redirect);
|
|
preverrout_fd = 2;
|
|
if (BASH_XTRACEFD && xflag) {
|
|
/* NB: bash closes fd == $BASH_XTRACEFD when it is changed.
|
|
* we do not emulate this. We only use its value.
|
|
*/
|
|
const char *xtracefd = lookupvar("BASH_XTRACEFD");
|
|
if (xtracefd && is_number(xtracefd))
|
|
preverrout_fd = atoi(xtracefd);
|
|
|
|
}
|
|
status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
|
|
|
|
path = vpath.var_text;
|
|
for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
|
|
struct strlist **spp;
|
|
char *p;
|
|
|
|
spp = varlist.lastp;
|
|
expandarg(argp, &varlist, EXP_VARTILDE);
|
|
|
|
mklocal((*spp)->text);
|
|
|
|
/*
|
|
* Modify the command lookup path, if a PATH= assignment
|
|
* is present
|
|
*/
|
|
p = (*spp)->text;
|
|
if (varcmp(p, path) == 0)
|
|
path = p;
|
|
}
|
|
|
|
/* Print the command if xflag is set. */
|
|
if (xflag) {
|
|
const char *pfx = "";
|
|
|
|
fdprintf(preverrout_fd, "%s", expandstr(ps4val(), DQSYNTAX));
|
|
|
|
sp = varlist.list;
|
|
while (sp) {
|
|
char *varval = sp->text;
|
|
char *eq = strchrnul(varval, '=');
|
|
if (*eq)
|
|
eq++;
|
|
fdprintf(preverrout_fd, "%s%.*s%s",
|
|
pfx,
|
|
(int)(eq - varval), varval,
|
|
maybe_single_quote(eq)
|
|
);
|
|
sp = sp->next;
|
|
pfx = " ";
|
|
}
|
|
|
|
sp = arglist.list;
|
|
while (sp) {
|
|
fdprintf(preverrout_fd, "%s%s",
|
|
pfx,
|
|
/* always quote if matches reserved word: */
|
|
findkwd(sp->text)
|
|
? single_quote(sp->text)
|
|
: maybe_single_quote(sp->text)
|
|
);
|
|
sp = sp->next;
|
|
pfx = " ";
|
|
}
|
|
safe_write(preverrout_fd, "\n", 1);
|
|
}
|
|
|
|
cmd_is_exec = 0;
|
|
spclbltin = -1;
|
|
|
|
/* Now locate the command. */
|
|
if (argc) {
|
|
int cmd_flag = DO_ERR;
|
|
#if ENABLE_ASH_CMDCMD
|
|
const char *oldpath = path + 5;
|
|
#endif
|
|
path += 5;
|
|
for (;;) {
|
|
find_command(argv[0], &cmdentry, cmd_flag, path);
|
|
if (cmdentry.cmdtype == CMDUNKNOWN) {
|
|
flush_stdout_stderr();
|
|
status = 127;
|
|
goto bail;
|
|
}
|
|
|
|
/* implement bltin and command here */
|
|
if (cmdentry.cmdtype != CMDBUILTIN)
|
|
break;
|
|
if (spclbltin < 0)
|
|
spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
|
|
if (cmdentry.u.cmd == EXECCMD)
|
|
cmd_is_exec = 1;
|
|
#if ENABLE_ASH_CMDCMD
|
|
if (cmdentry.u.cmd == COMMANDCMD) {
|
|
path = oldpath;
|
|
nargv = parse_command_args(argv, &path);
|
|
if (!nargv)
|
|
break;
|
|
/* It's "command [-p] PROG ARGS" (that is, no -Vv).
|
|
* nargv => "PROG". path is updated if -p.
|
|
*/
|
|
argc -= nargv - argv;
|
|
argv = nargv;
|
|
cmd_flag |= DO_NOFUNC;
|
|
} else
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (status) {
|
|
bail:
|
|
exitstatus = status;
|
|
|
|
/* We have a redirection error. */
|
|
if (spclbltin > 0)
|
|
raise_exception(EXERROR);
|
|
|
|
goto out;
|
|
}
|
|
|
|
/* Execute the command. */
|
|
switch (cmdentry.cmdtype) {
|
|
default: {
|
|
|
|
#if ENABLE_FEATURE_SH_STANDALONE \
|
|
&& ENABLE_FEATURE_SH_NOFORK \
|
|
&& NUM_APPLETS > 1
|
|
/* (1) BUG: if variables are set, we need to fork, or save/restore them
|
|
* around run_nofork_applet() call.
|
|
* (2) Should this check also be done in forkshell()?
|
|
* (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...)
|
|
*/
|
|
/* find_command() encodes applet_no as (-2 - applet_no) */
|
|
int applet_no = (- cmdentry.u.index - 2);
|
|
if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
|
|
char **sv_environ;
|
|
|
|
INT_OFF;
|
|
sv_environ = environ;
|
|
environ = listvars(VEXPORT, VUNSET, varlist.list, /*end:*/ NULL);
|
|
/*
|
|
* Run <applet>_main().
|
|
* Signals (^C) can't interrupt here.
|
|
* Otherwise we can mangle stdio or malloc internal state.
|
|
* This makes applets which can run for a long time
|
|
* and/or wait for user input ineligible for NOFORK:
|
|
* for example, "yes" or "rm" (rm -i waits for input).
|
|
*/
|
|
status = run_nofork_applet(applet_no, argv);
|
|
environ = sv_environ;
|
|
/*
|
|
* Try enabling NOFORK for "yes" applet.
|
|
* ^C _will_ stop it (write returns EINTR),
|
|
* but this causes stdout FILE to be stuck
|
|
* and needing clearerr(). What if other applets
|
|
* also can get EINTRs? Do we need to switch
|
|
* our signals to SA_RESTART?
|
|
*/
|
|
/*clearerr(stdout);*/
|
|
INT_ON;
|
|
break;
|
|
}
|
|
#endif
|
|
/* Can we avoid forking? For example, very last command
|
|
* in a script or a subshell does not need forking,
|
|
* we can just exec it.
|
|
*/
|
|
if (!(flags & EV_EXIT) || may_have_traps) {
|
|
/* No, forking off a child is necessary */
|
|
INT_OFF;
|
|
get_tty_state();
|
|
jp = makejob(/*cmd,*/ 1);
|
|
if (forkshell(jp, cmd, FORK_FG) != 0) {
|
|
/* parent */
|
|
status = waitforjob(jp);
|
|
INT_ON;
|
|
TRACE(("forked child exited with %d\n", status));
|
|
break;
|
|
}
|
|
/* child */
|
|
FORCE_INT_ON;
|
|
/* fall through to exec'ing external program */
|
|
}
|
|
listsetvar(varlist.list, VEXPORT|VSTACK);
|
|
shellexec(argv[0], argv, path, cmdentry.u.index);
|
|
/* NOTREACHED */
|
|
} /* default */
|
|
case CMDBUILTIN:
|
|
if (spclbltin > 0 || argc == 0) {
|
|
poplocalvars(1);
|
|
if (cmd_is_exec && argc > 1)
|
|
listsetvar(varlist.list, VEXPORT);
|
|
}
|
|
|
|
/* Tight loop with builtins only:
|
|
* "while kill -0 $child; do true; done"
|
|
* will never exit even if $child died, unless we do this
|
|
* to reap the zombie and make kill detect that it's gone: */
|
|
dowait(DOWAIT_NONBLOCK, NULL);
|
|
|
|
if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) {
|
|
if (exception_type == EXERROR && spclbltin <= 0) {
|
|
FORCE_INT_ON;
|
|
goto readstatus;
|
|
}
|
|
raise:
|
|
longjmp(exception_handler->loc, 1);
|
|
}
|
|
goto readstatus;
|
|
|
|
case CMDFUNCTION:
|
|
/* See above for the rationale */
|
|
dowait(DOWAIT_NONBLOCK, NULL);
|
|
if (evalfun(cmdentry.u.func, argc, argv, flags))
|
|
goto raise;
|
|
readstatus:
|
|
status = exitstatus;
|
|
break;
|
|
} /* switch */
|
|
|
|
out:
|
|
if (cmd->ncmd.redirect)
|
|
popredir(/*drop:*/ cmd_is_exec);
|
|
unwindredir(redir_stop);
|
|
unwindfiles(file_stop);
|
|
unwindlocalvars(localvar_stop);
|
|
if (lastarg) {
|
|
/* dsl: I think this is intended to be used to support
|
|
* '_' in 'vi' command mode during line editing...
|
|
* However I implemented that within libedit itself.
|
|
*/
|
|
setvar0("_", lastarg);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags)
|
|
{
|
|
char *volatile savecmdname;
|
|
struct jmploc *volatile savehandler;
|
|
struct jmploc jmploc;
|
|
int status;
|
|
int i;
|
|
|
|
savecmdname = commandname;
|
|
savehandler = exception_handler;
|
|
i = setjmp(jmploc.loc);
|
|
if (i)
|
|
goto cmddone;
|
|
exception_handler = &jmploc;
|
|
commandname = argv[0];
|
|
argptr = argv + 1;
|
|
optptr = NULL; /* initialize nextopt */
|
|
if (cmd == EVALCMD)
|
|
status = evalcmd(argc, argv, flags);
|
|
else
|
|
status = (*cmd->builtin)(argc, argv);
|
|
flush_stdout_stderr();
|
|
status |= ferror(stdout);
|
|
exitstatus = status;
|
|
cmddone:
|
|
clearerr(stdout);
|
|
commandname = savecmdname;
|
|
exception_handler = savehandler;
|
|
|
|
return i;
|
|
}
|
|
|
|
static int
|
|
goodname(const char *p)
|
|
{
|
|
return endofname(p)[0] == '\0';
|
|
}
|
|
|
|
|
|
/*
|
|
* Search for a command. This is called before we fork so that the
|
|
* location of the command will be available in the parent as well as
|
|
* the child. The check for "goodname" is an overly conservative
|
|
* check that the name will not be subject to expansion.
|
|
*/
|
|
static void
|
|
prehash(union node *n)
|
|
{
|
|
struct cmdentry entry;
|
|
|
|
if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
|
|
find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
|
|
}
|
|
|
|
|
|
/* ============ Builtin commands
|
|
*
|
|
* Builtin commands whose functions are closely tied to evaluation
|
|
* are implemented here.
|
|
*/
|
|
|
|
/*
|
|
* Handle break and continue commands. Break, continue, and return are
|
|
* all handled by setting the evalskip flag. The evaluation routines
|
|
* above all check this flag, and if it is set they start skipping
|
|
* commands rather than executing them. The variable skipcount is
|
|
* the number of loops to break/continue, or the number of function
|
|
* levels to return. (The latter is always 1.) It should probably
|
|
* be an error to break out of more loops than exist, but it isn't
|
|
* in the standard shell so we don't make it one here.
|
|
*/
|
|
static int FAST_FUNC
|
|
breakcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
int n = argv[1] ? number(argv[1]) : 1;
|
|
|
|
if (n <= 0)
|
|
ash_msg_and_raise_error(msg_illnum, argv[1]);
|
|
if (n > loopnest)
|
|
n = loopnest;
|
|
if (n > 0) {
|
|
evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
|
|
skipcount = n;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* This implements the input routines used by the parser.
|
|
*/
|
|
|
|
enum {
|
|
INPUT_PUSH_FILE = 1,
|
|
INPUT_NOFILE_OK = 2,
|
|
};
|
|
|
|
static smallint checkkwd;
|
|
/* values of checkkwd variable */
|
|
#define CHKALIAS 0x1
|
|
#define CHKKWD 0x2
|
|
#define CHKNL 0x4
|
|
#define CHKEOFMARK 0x8
|
|
|
|
/*
|
|
* Push a string back onto the input at this current parsefile level.
|
|
* We handle aliases this way.
|
|
*/
|
|
#if !ENABLE_ASH_ALIAS
|
|
#define pushstring(s, ap) pushstring(s)
|
|
#endif
|
|
static void
|
|
pushstring(char *s, struct alias *ap)
|
|
{
|
|
struct strpush *sp;
|
|
int len;
|
|
|
|
len = strlen(s);
|
|
INT_OFF;
|
|
if (g_parsefile->strpush) {
|
|
sp = ckzalloc(sizeof(*sp));
|
|
sp->prev = g_parsefile->strpush;
|
|
} else {
|
|
sp = &(g_parsefile->basestrpush);
|
|
}
|
|
g_parsefile->strpush = sp;
|
|
sp->prev_string = g_parsefile->next_to_pgetc;
|
|
sp->prev_left_in_line = g_parsefile->left_in_line;
|
|
sp->unget = g_parsefile->unget;
|
|
memcpy(sp->lastc, g_parsefile->lastc, sizeof(sp->lastc));
|
|
#if ENABLE_ASH_ALIAS
|
|
sp->ap = ap;
|
|
if (ap) {
|
|
ap->flag |= ALIASINUSE;
|
|
sp->string = s;
|
|
}
|
|
#endif
|
|
g_parsefile->next_to_pgetc = s;
|
|
g_parsefile->left_in_line = len;
|
|
g_parsefile->unget = 0;
|
|
INT_ON;
|
|
}
|
|
|
|
static void
|
|
popstring(void)
|
|
{
|
|
struct strpush *sp = g_parsefile->strpush;
|
|
|
|
INT_OFF;
|
|
#if ENABLE_ASH_ALIAS
|
|
if (sp->ap) {
|
|
if (g_parsefile->next_to_pgetc[-1] == ' '
|
|
|| g_parsefile->next_to_pgetc[-1] == '\t'
|
|
) {
|
|
checkkwd |= CHKALIAS;
|
|
}
|
|
if (sp->string != sp->ap->val) {
|
|
free(sp->string);
|
|
}
|
|
sp->ap->flag &= ~ALIASINUSE;
|
|
if (sp->ap->flag & ALIASDEAD) {
|
|
unalias(sp->ap->name);
|
|
}
|
|
}
|
|
#endif
|
|
g_parsefile->next_to_pgetc = sp->prev_string;
|
|
g_parsefile->left_in_line = sp->prev_left_in_line;
|
|
g_parsefile->unget = sp->unget;
|
|
memcpy(g_parsefile->lastc, sp->lastc, sizeof(sp->lastc));
|
|
g_parsefile->strpush = sp->prev;
|
|
if (sp != &(g_parsefile->basestrpush))
|
|
free(sp);
|
|
INT_ON;
|
|
}
|
|
|
|
static int
|
|
preadfd(void)
|
|
{
|
|
int nr;
|
|
char *buf = g_parsefile->buf;
|
|
|
|
g_parsefile->next_to_pgetc = buf;
|
|
#if ENABLE_FEATURE_EDITING
|
|
retry:
|
|
if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
|
|
nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
|
|
else {
|
|
# if ENABLE_ASH_IDLE_TIMEOUT
|
|
int timeout = -1;
|
|
const char *tmout_var = lookupvar("TMOUT");
|
|
if (tmout_var) {
|
|
timeout = atoi(tmout_var) * 1000;
|
|
if (timeout <= 0)
|
|
timeout = -1;
|
|
}
|
|
line_input_state->timeout = timeout;
|
|
# endif
|
|
# if ENABLE_FEATURE_TAB_COMPLETION
|
|
line_input_state->path_lookup = pathval();
|
|
# endif
|
|
reinit_unicode_for_ash();
|
|
nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ);
|
|
if (nr == 0) {
|
|
/* ^C pressed, "convert" to SIGINT */
|
|
write(STDOUT_FILENO, "^C", 2);
|
|
if (trap[SIGINT]) {
|
|
buf[0] = '\n';
|
|
buf[1] = '\0';
|
|
raise(SIGINT);
|
|
return 1;
|
|
}
|
|
exitstatus = 128 + SIGINT;
|
|
bb_putchar('\n');
|
|
goto retry;
|
|
}
|
|
if (nr < 0) {
|
|
if (errno == 0) {
|
|
/* Ctrl+D pressed */
|
|
nr = 0;
|
|
}
|
|
# if ENABLE_ASH_IDLE_TIMEOUT
|
|
else if (errno == EAGAIN && timeout > 0) {
|
|
puts("\007timed out waiting for input: auto-logout");
|
|
exitshell();
|
|
}
|
|
# endif
|
|
}
|
|
}
|
|
#else
|
|
nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
|
|
#endif
|
|
|
|
#if 0 /* disabled: nonblock_immune_read() handles this problem */
|
|
if (nr < 0) {
|
|
if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
|
|
int flags = fcntl(0, F_GETFL);
|
|
if (flags >= 0 && (flags & O_NONBLOCK)) {
|
|
flags &= ~O_NONBLOCK;
|
|
if (fcntl(0, F_SETFL, flags) >= 0) {
|
|
out2str("sh: turning off NDELAY mode\n");
|
|
goto retry;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
return nr;
|
|
}
|
|
|
|
/*
|
|
* Refill the input buffer and return the next input character:
|
|
*
|
|
* 1) If a string was pushed back on the input, pop it;
|
|
* 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
|
|
* or we are reading from a string so we can't refill the buffer,
|
|
* return EOF.
|
|
* 3) If there is more stuff in this buffer, use it else call read to fill it.
|
|
* 4) Process input up to the next newline, deleting nul characters.
|
|
*/
|
|
//#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
|
|
#define pgetc_debug(...) ((void)0)
|
|
static int pgetc(void);
|
|
static int
|
|
preadbuffer(void)
|
|
{
|
|
char *q;
|
|
int more;
|
|
|
|
if (g_parsefile->strpush) {
|
|
#if ENABLE_ASH_ALIAS
|
|
if (g_parsefile->left_in_line == -1
|
|
&& g_parsefile->strpush->ap
|
|
&& g_parsefile->next_to_pgetc[-1] != ' '
|
|
&& g_parsefile->next_to_pgetc[-1] != '\t'
|
|
) {
|
|
pgetc_debug("preadbuffer PEOA");
|
|
return PEOA;
|
|
}
|
|
#endif
|
|
popstring();
|
|
return pgetc();
|
|
}
|
|
/* on both branches above g_parsefile->left_in_line < 0.
|
|
* "pgetc" needs refilling.
|
|
*/
|
|
|
|
/* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
|
|
* pungetc() may increment it a few times.
|
|
* Assuming it won't increment it to less than -90.
|
|
*/
|
|
if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
|
|
pgetc_debug("preadbuffer PEOF1");
|
|
/* even in failure keep left_in_line and next_to_pgetc
|
|
* in lock step, for correct multi-layer pungetc.
|
|
* left_in_line was decremented before preadbuffer(),
|
|
* must inc next_to_pgetc: */
|
|
g_parsefile->next_to_pgetc++;
|
|
return PEOF;
|
|
}
|
|
|
|
more = g_parsefile->left_in_buffer;
|
|
if (more <= 0) {
|
|
flush_stdout_stderr();
|
|
again:
|
|
more = preadfd();
|
|
if (more <= 0) {
|
|
/* don't try reading again */
|
|
g_parsefile->left_in_line = -99;
|
|
pgetc_debug("preadbuffer PEOF2");
|
|
g_parsefile->next_to_pgetc++;
|
|
return PEOF;
|
|
}
|
|
}
|
|
|
|
/* Find out where's the end of line.
|
|
* Set g_parsefile->left_in_line
|
|
* and g_parsefile->left_in_buffer acordingly.
|
|
* NUL chars are deleted.
|
|
*/
|
|
q = g_parsefile->next_to_pgetc;
|
|
for (;;) {
|
|
char c;
|
|
|
|
more--;
|
|
|
|
c = *q;
|
|
if (c == '\0') {
|
|
memmove(q, q + 1, more);
|
|
} else {
|
|
q++;
|
|
if (c == '\n') {
|
|
g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (more <= 0) {
|
|
g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
|
|
if (g_parsefile->left_in_line < 0)
|
|
goto again;
|
|
break;
|
|
}
|
|
}
|
|
g_parsefile->left_in_buffer = more;
|
|
|
|
if (vflag) {
|
|
char save = *q;
|
|
*q = '\0';
|
|
out2str(g_parsefile->next_to_pgetc);
|
|
*q = save;
|
|
}
|
|
|
|
pgetc_debug("preadbuffer at %d:%p'%s'",
|
|
g_parsefile->left_in_line,
|
|
g_parsefile->next_to_pgetc,
|
|
g_parsefile->next_to_pgetc);
|
|
return (unsigned char)*g_parsefile->next_to_pgetc++;
|
|
}
|
|
|
|
static void
|
|
nlprompt(void)
|
|
{
|
|
g_parsefile->linno++;
|
|
setprompt_if(doprompt, 2);
|
|
}
|
|
static void
|
|
nlnoprompt(void)
|
|
{
|
|
g_parsefile->linno++;
|
|
needprompt = doprompt;
|
|
}
|
|
|
|
static int
|
|
pgetc(void)
|
|
{
|
|
int c;
|
|
|
|
pgetc_debug("pgetc at %d:%p'%s'",
|
|
g_parsefile->left_in_line,
|
|
g_parsefile->next_to_pgetc,
|
|
g_parsefile->next_to_pgetc);
|
|
if (g_parsefile->unget)
|
|
return g_parsefile->lastc[--g_parsefile->unget];
|
|
|
|
if (--g_parsefile->left_in_line >= 0)
|
|
c = (unsigned char)*g_parsefile->next_to_pgetc++;
|
|
else
|
|
c = preadbuffer();
|
|
|
|
g_parsefile->lastc[1] = g_parsefile->lastc[0];
|
|
g_parsefile->lastc[0] = c;
|
|
|
|
return c;
|
|
}
|
|
|
|
#if ENABLE_ASH_ALIAS
|
|
static int
|
|
pgetc_without_PEOA(void)
|
|
{
|
|
int c;
|
|
do {
|
|
pgetc_debug("pgetc at %d:%p'%s'",
|
|
g_parsefile->left_in_line,
|
|
g_parsefile->next_to_pgetc,
|
|
g_parsefile->next_to_pgetc);
|
|
c = pgetc();
|
|
} while (c == PEOA);
|
|
return c;
|
|
}
|
|
#else
|
|
# define pgetc_without_PEOA() pgetc()
|
|
#endif
|
|
|
|
/*
|
|
* Undo a call to pgetc. Only two characters may be pushed back.
|
|
* PEOF may be pushed back.
|
|
*/
|
|
static void
|
|
pungetc(void)
|
|
{
|
|
g_parsefile->unget++;
|
|
}
|
|
|
|
/* This one eats backslash+newline */
|
|
static int
|
|
pgetc_eatbnl(void)
|
|
{
|
|
int c;
|
|
|
|
while ((c = pgetc()) == '\\') {
|
|
if (pgetc() != '\n') {
|
|
pungetc();
|
|
break;
|
|
}
|
|
|
|
nlprompt();
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
struct synstack {
|
|
smalluint syntax;
|
|
uint8_t innerdq :1;
|
|
uint8_t varpushed :1;
|
|
uint8_t dblquote :1;
|
|
int varnest; /* levels of variables expansion */
|
|
int dqvarnest; /* levels of variables expansion within double quotes */
|
|
int parenlevel; /* levels of parens in arithmetic */
|
|
struct synstack *prev;
|
|
struct synstack *next;
|
|
};
|
|
|
|
static void
|
|
synstack_push(struct synstack **stack, struct synstack *next, int syntax)
|
|
{
|
|
memset(next, 0, sizeof(*next));
|
|
next->syntax = syntax;
|
|
next->next = *stack;
|
|
(*stack)->prev = next;
|
|
*stack = next;
|
|
}
|
|
|
|
static ALWAYS_INLINE void
|
|
synstack_pop(struct synstack **stack)
|
|
{
|
|
*stack = (*stack)->next;
|
|
}
|
|
|
|
/*
|
|
* To handle the "." command, a stack of input files is used. Pushfile
|
|
* adds a new entry to the stack and popfile restores the previous level.
|
|
*/
|
|
static void
|
|
pushfile(void)
|
|
{
|
|
struct parsefile *pf;
|
|
|
|
pf = ckzalloc(sizeof(*pf));
|
|
pf->prev = g_parsefile;
|
|
pf->pf_fd = -1;
|
|
/*pf->strpush = NULL; - ckzalloc did it */
|
|
/*pf->basestrpush.prev = NULL;*/
|
|
/*pf->unget = 0;*/
|
|
g_parsefile = pf;
|
|
}
|
|
|
|
static void
|
|
popfile(void)
|
|
{
|
|
struct parsefile *pf = g_parsefile;
|
|
|
|
if (pf == &basepf)
|
|
return;
|
|
|
|
INT_OFF;
|
|
if (pf->pf_fd >= 0)
|
|
close(pf->pf_fd);
|
|
free(pf->buf);
|
|
while (pf->strpush)
|
|
popstring();
|
|
g_parsefile = pf->prev;
|
|
free(pf);
|
|
INT_ON;
|
|
}
|
|
|
|
static void
|
|
unwindfiles(struct parsefile *stop)
|
|
{
|
|
while (g_parsefile != stop)
|
|
popfile();
|
|
}
|
|
|
|
/*
|
|
* Return to top level.
|
|
*/
|
|
static void
|
|
popallfiles(void)
|
|
{
|
|
unwindfiles(&basepf);
|
|
}
|
|
|
|
/*
|
|
* Close the file(s) that the shell is reading commands from. Called
|
|
* after a fork is done.
|
|
*/
|
|
static void
|
|
closescript(void)
|
|
{
|
|
popallfiles();
|
|
if (g_parsefile->pf_fd > 0) {
|
|
close(g_parsefile->pf_fd);
|
|
g_parsefile->pf_fd = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Like setinputfile, but takes an open file descriptor. Call this with
|
|
* interrupts off.
|
|
*/
|
|
static void
|
|
setinputfd(int fd, int push)
|
|
{
|
|
if (push) {
|
|
pushfile();
|
|
g_parsefile->buf = NULL;
|
|
}
|
|
g_parsefile->pf_fd = fd;
|
|
if (g_parsefile->buf == NULL)
|
|
g_parsefile->buf = ckmalloc(IBUFSIZ);
|
|
g_parsefile->left_in_buffer = 0;
|
|
g_parsefile->left_in_line = 0;
|
|
g_parsefile->linno = 1;
|
|
}
|
|
|
|
/*
|
|
* Set the input to take input from a file. If push is set, push the
|
|
* old input onto the stack first.
|
|
*/
|
|
static int
|
|
setinputfile(const char *fname, int flags)
|
|
{
|
|
int fd;
|
|
|
|
INT_OFF;
|
|
fd = open(fname, O_RDONLY | O_CLOEXEC);
|
|
if (fd < 0) {
|
|
if (flags & INPUT_NOFILE_OK)
|
|
goto out;
|
|
exitstatus = 127;
|
|
ash_msg_and_raise_perror("can't open '%s'", fname);
|
|
}
|
|
if (fd < 10)
|
|
fd = savefd(fd);
|
|
else if (O_CLOEXEC == 0) /* old libc */
|
|
close_on_exec_on(fd);
|
|
|
|
setinputfd(fd, flags & INPUT_PUSH_FILE);
|
|
out:
|
|
INT_ON;
|
|
return fd;
|
|
}
|
|
|
|
/*
|
|
* Like setinputfile, but takes input from a string.
|
|
*/
|
|
static void
|
|
setinputstring(char *string)
|
|
{
|
|
INT_OFF;
|
|
pushfile();
|
|
g_parsefile->next_to_pgetc = string;
|
|
g_parsefile->left_in_line = strlen(string);
|
|
g_parsefile->buf = NULL;
|
|
g_parsefile->linno = 1;
|
|
INT_ON;
|
|
}
|
|
|
|
|
|
/*
|
|
* Routines to check for mail.
|
|
*/
|
|
|
|
#if ENABLE_ASH_MAIL
|
|
|
|
/* Hash of mtimes of mailboxes */
|
|
static unsigned mailtime_hash;
|
|
/* Set if MAIL or MAILPATH is changed. */
|
|
static smallint mail_var_path_changed;
|
|
|
|
/*
|
|
* Print appropriate message(s) if mail has arrived.
|
|
* If mail_var_path_changed is set,
|
|
* then the value of MAIL has mail_var_path_changed,
|
|
* so we just update the values.
|
|
*/
|
|
static void
|
|
chkmail(void)
|
|
{
|
|
const char *mpath;
|
|
char *p;
|
|
char *q;
|
|
unsigned new_hash;
|
|
struct stackmark smark;
|
|
struct stat statb;
|
|
|
|
setstackmark(&smark);
|
|
mpath = mpathset() ? mpathval() : mailval();
|
|
new_hash = 0;
|
|
for (;;) {
|
|
p = path_advance(&mpath, nullstr);
|
|
if (p == NULL)
|
|
break;
|
|
if (*p == '\0')
|
|
continue;
|
|
for (q = p; *q; q++)
|
|
continue;
|
|
#if DEBUG
|
|
if (q[-1] != '/')
|
|
abort();
|
|
#endif
|
|
q[-1] = '\0'; /* delete trailing '/' */
|
|
if (stat(p, &statb) < 0) {
|
|
continue;
|
|
}
|
|
/* Very simplistic "hash": just a sum of all mtimes */
|
|
new_hash += (unsigned)statb.st_mtime;
|
|
}
|
|
if (!mail_var_path_changed && mailtime_hash != new_hash) {
|
|
if (mailtime_hash != 0)
|
|
out2str("you have mail\n");
|
|
mailtime_hash = new_hash;
|
|
}
|
|
mail_var_path_changed = 0;
|
|
popstackmark(&smark);
|
|
}
|
|
|
|
static void FAST_FUNC
|
|
changemail(const char *val UNUSED_PARAM)
|
|
{
|
|
mail_var_path_changed = 1;
|
|
}
|
|
|
|
#endif /* ASH_MAIL */
|
|
|
|
|
|
/* ============ ??? */
|
|
|
|
/*
|
|
* Set the shell parameters.
|
|
*/
|
|
static void
|
|
setparam(char **argv)
|
|
{
|
|
char **newparam;
|
|
char **ap;
|
|
int nparam;
|
|
|
|
for (nparam = 0; argv[nparam]; nparam++)
|
|
continue;
|
|
ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
|
|
while (*argv) {
|
|
*ap++ = ckstrdup(*argv++);
|
|
}
|
|
*ap = NULL;
|
|
freeparam(&shellparam);
|
|
shellparam.malloced = 1;
|
|
shellparam.nparam = nparam;
|
|
shellparam.p = newparam;
|
|
#if ENABLE_ASH_GETOPTS
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Process shell options. The global variable argptr contains a pointer
|
|
* to the argument list; we advance it past the options.
|
|
*
|
|
* SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
|
|
* For a non-interactive shell, an error condition encountered
|
|
* by a special built-in ... shall cause the shell to write a diagnostic message
|
|
* to standard error and exit as shown in the following table:
|
|
* Error Special Built-In
|
|
* ...
|
|
* Utility syntax error (option or operand error) Shall exit
|
|
* ...
|
|
* However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
|
|
* we see that bash does not do that (set "finishes" with error code 1 instead,
|
|
* and shell continues), and people rely on this behavior!
|
|
* Testcase:
|
|
* set -o barfoo 2>/dev/null
|
|
* echo $?
|
|
*
|
|
* Oh well. Let's mimic that.
|
|
*/
|
|
static int
|
|
plus_minus_o(char *name, int val)
|
|
{
|
|
int i;
|
|
|
|
if (name) {
|
|
for (i = 0; i < NOPTS; i++) {
|
|
if (strcmp(name, optnames(i)) == 0) {
|
|
optlist[i] = val;
|
|
return 0;
|
|
}
|
|
}
|
|
ash_msg("illegal option %co %s", val ? '-' : '+', name);
|
|
return 1;
|
|
}
|
|
for (i = 0; i < NOPTS; i++) {
|
|
if (optnames(i)[0] == '\0')
|
|
continue;
|
|
if (val) {
|
|
out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
|
|
} else {
|
|
out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
static void
|
|
setoption(int flag, int val)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NOPTS; i++) {
|
|
if (optletters(i) == flag && optnames(i)[0] != '\0') {
|
|
optlist[i] = val;
|
|
return;
|
|
}
|
|
}
|
|
ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
|
|
/* NOTREACHED */
|
|
}
|
|
/* If login_sh is not NULL, we are called to parse command line opts,
|
|
* not "set -opts"
|
|
*/
|
|
static int
|
|
options(int *login_sh)
|
|
{
|
|
char *p;
|
|
int val;
|
|
int c;
|
|
|
|
if (login_sh)
|
|
minusc = NULL;
|
|
while ((p = *argptr) != NULL) {
|
|
c = *p++;
|
|
if (c != '-' && c != '+')
|
|
break;
|
|
argptr++;
|
|
val = 0; /* val = 0 if c == '+' */
|
|
if (c == '-') {
|
|
val = 1;
|
|
if (p[0] == '\0' || LONE_DASH(p)) {
|
|
if (!login_sh) {
|
|
/* "-" means turn off -x and -v */
|
|
if (p[0] == '\0')
|
|
xflag = vflag = 0;
|
|
/* "--" means reset params */
|
|
else if (*argptr == NULL)
|
|
setparam(argptr);
|
|
}
|
|
break; /* "-" or "--" terminates options */
|
|
}
|
|
}
|
|
/* first char was + or - */
|
|
while ((c = *p++) != '\0') {
|
|
if (login_sh) {
|
|
/* bash 3.2 indeed handles -c CMD and +c CMD the same */
|
|
if (c == 'c') {
|
|
minusc = p; /* command is after shell args */
|
|
cflag = 1;
|
|
continue;
|
|
}
|
|
if (c == 's') { /* -s, +s */
|
|
sflag = 1;
|
|
continue;
|
|
}
|
|
if (c == 'i') { /* -i, +i */
|
|
iflag = 1;
|
|
continue;
|
|
}
|
|
if (c == 'l') {
|
|
*login_sh = 1; /* -l or +l == --login */
|
|
continue;
|
|
}
|
|
/* bash does not accept +-login, we also won't */
|
|
if (val && (c == '-')) { /* long options */
|
|
if (strcmp(p, "login") == 0) {
|
|
*login_sh = 1;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (c == 'o') {
|
|
if (plus_minus_o(*argptr, val)) {
|
|
/* it already printed err message */
|
|
return 1; /* error */
|
|
}
|
|
if (*argptr)
|
|
argptr++;
|
|
} else {
|
|
setoption(c, val);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The shift builtin command.
|
|
*/
|
|
static int FAST_FUNC
|
|
shiftcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
int n;
|
|
char **ap1, **ap2;
|
|
|
|
n = 1;
|
|
if (argv[1])
|
|
n = number(argv[1]);
|
|
if (n > shellparam.nparam)
|
|
return 1;
|
|
INT_OFF;
|
|
shellparam.nparam -= n;
|
|
for (ap1 = shellparam.p; --n >= 0; ap1++) {
|
|
if (shellparam.malloced)
|
|
free(*ap1);
|
|
}
|
|
ap2 = shellparam.p;
|
|
while ((*ap2++ = *ap1++) != NULL)
|
|
continue;
|
|
#if ENABLE_ASH_GETOPTS
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
#endif
|
|
INT_ON;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* POSIX requires that 'set' (but not export or readonly) output the
|
|
* variables in lexicographic order - by the locale's collating order (sigh).
|
|
* Maybe we could keep them in an ordered balanced binary tree
|
|
* instead of hashed lists.
|
|
* For now just roll 'em through qsort for printing...
|
|
*/
|
|
static int
|
|
showvars(const char *sep_prefix, int on, int off)
|
|
{
|
|
const char *sep;
|
|
char **ep, **epend;
|
|
|
|
ep = listvars(on, off, /*strlist:*/ NULL, &epend);
|
|
qsort(ep, epend - ep, sizeof(char *), vpcmp);
|
|
|
|
sep = *sep_prefix ? " " : sep_prefix;
|
|
|
|
for (; ep < epend; ep++) {
|
|
const char *p;
|
|
const char *q;
|
|
|
|
p = endofname(*ep);
|
|
/* Used to have simple "p = strchrnul(*ep, '=')" here instead, but this
|
|
* makes "export -p" to have output not suitable for "eval":
|
|
* import os
|
|
* os.environ["test-test"]="test"
|
|
* if os.fork() == 0:
|
|
* os.execv("ash", [ 'ash', '-c', 'eval $(export -p); echo OK' ]) # fixes this
|
|
* os.execv("ash", [ 'ash', '-c', 'env | grep test-test' ])
|
|
*/
|
|
q = nullstr;
|
|
if (*p == '=')
|
|
q = single_quote(++p);
|
|
out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The set command builtin.
|
|
*/
|
|
static int FAST_FUNC
|
|
setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
int retval;
|
|
|
|
if (!argv[1])
|
|
return showvars(nullstr, 0, VUNSET);
|
|
|
|
INT_OFF;
|
|
retval = options(/*login_sh:*/ NULL);
|
|
if (retval == 0) { /* if no parse error... */
|
|
optschanged();
|
|
if (*argptr != NULL) {
|
|
setparam(argptr);
|
|
}
|
|
}
|
|
INT_ON;
|
|
return retval;
|
|
}
|
|
|
|
#if ENABLE_ASH_RANDOM_SUPPORT
|
|
static void FAST_FUNC
|
|
change_random(const char *value)
|
|
{
|
|
uint32_t t;
|
|
|
|
if (value == NULL) {
|
|
/* "get", generate */
|
|
t = next_random(&random_gen);
|
|
/* set without recursion */
|
|
setvar(vrandom.var_text, utoa(t), VNOFUNC);
|
|
vrandom.flags &= ~VNOFUNC;
|
|
} else {
|
|
/* set/reset */
|
|
t = strtoul(value, NULL, 10);
|
|
INIT_RANDOM_T(&random_gen, (t ? t : 1), t);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if BASH_EPOCH_VARS
|
|
static void FAST_FUNC
|
|
change_epoch(struct var *vepoch, const char *fmt)
|
|
{
|
|
struct timeval tv;
|
|
char buffer[sizeof("%lu.nnnnnn") + sizeof(long)*3];
|
|
|
|
gettimeofday(&tv, NULL);
|
|
sprintf(buffer, fmt, (unsigned long)tv.tv_sec, (unsigned)tv.tv_usec);
|
|
setvar(vepoch->var_text, buffer, VNOFUNC);
|
|
vepoch->flags &= ~VNOFUNC;
|
|
}
|
|
|
|
static void FAST_FUNC
|
|
change_seconds(const char *value UNUSED_PARAM)
|
|
{
|
|
change_epoch(&vepochs, "%lu");
|
|
}
|
|
|
|
static void FAST_FUNC
|
|
change_realtime(const char *value UNUSED_PARAM)
|
|
{
|
|
change_epoch(&vepochr, "%lu.%06u");
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_ASH_GETOPTS
|
|
static int
|
|
getopts(char *optstr, char *optvar, char **optfirst)
|
|
{
|
|
char *p, *q;
|
|
char c = '?';
|
|
int done = 0;
|
|
char sbuf[2];
|
|
char **optnext;
|
|
int ind = shellparam.optind;
|
|
int off = shellparam.optoff;
|
|
|
|
sbuf[1] = '\0';
|
|
|
|
shellparam.optind = -1;
|
|
optnext = optfirst + ind - 1;
|
|
|
|
if (ind <= 1 || off < 0 || (int)strlen(optnext[-1]) < off)
|
|
p = NULL;
|
|
else
|
|
p = optnext[-1] + off;
|
|
if (p == NULL || *p == '\0') {
|
|
/* Current word is done, advance */
|
|
p = *optnext;
|
|
if (p == NULL || *p != '-' || *++p == '\0') {
|
|
atend:
|
|
unsetvar("OPTARG");
|
|
p = NULL;
|
|
done = 1;
|
|
goto out;
|
|
}
|
|
optnext++;
|
|
if (LONE_DASH(p)) /* check for "--" */
|
|
goto atend;
|
|
}
|
|
|
|
c = *p++;
|
|
for (q = optstr; *q != c;) {
|
|
if (*q == '\0') {
|
|
/* OPTERR is a bashism */
|
|
const char *cp = lookupvar("OPTERR");
|
|
if ((cp && LONE_CHAR(cp, '0'))
|
|
|| (optstr[0] == ':')
|
|
) {
|
|
sbuf[0] = c;
|
|
/*sbuf[1] = '\0'; - already is */
|
|
setvar0("OPTARG", sbuf);
|
|
} else {
|
|
fprintf(stderr, "Illegal option -%c\n", c);
|
|
unsetvar("OPTARG");
|
|
}
|
|
c = '?';
|
|
goto out;
|
|
}
|
|
if (*++q == ':')
|
|
q++;
|
|
}
|
|
|
|
if (*++q == ':') {
|
|
if (*p == '\0' && (p = *optnext) == NULL) {
|
|
/* OPTERR is a bashism */
|
|
const char *cp = lookupvar("OPTERR");
|
|
if ((cp && LONE_CHAR(cp, '0'))
|
|
|| (optstr[0] == ':')
|
|
) {
|
|
sbuf[0] = c;
|
|
/*sbuf[1] = '\0'; - already is */
|
|
setvar0("OPTARG", sbuf);
|
|
c = ':';
|
|
} else {
|
|
fprintf(stderr, "No arg for -%c option\n", c);
|
|
unsetvar("OPTARG");
|
|
c = '?';
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
if (p == *optnext)
|
|
optnext++;
|
|
setvar0("OPTARG", p);
|
|
p = NULL;
|
|
} else
|
|
setvar0("OPTARG", nullstr);
|
|
out:
|
|
ind = optnext - optfirst + 1;
|
|
setvar("OPTIND", itoa(ind), VNOFUNC);
|
|
sbuf[0] = c;
|
|
/*sbuf[1] = '\0'; - already is */
|
|
setvar0(optvar, sbuf);
|
|
|
|
shellparam.optoff = p ? p - *(optnext - 1) : -1;
|
|
shellparam.optind = ind;
|
|
|
|
return done;
|
|
}
|
|
|
|
/*
|
|
* The getopts builtin. Shellparam.optnext points to the next argument
|
|
* to be processed. Shellparam.optptr points to the next character to
|
|
* be processed in the current argument. If shellparam.optnext is NULL,
|
|
* then it's the first time getopts has been called.
|
|
*/
|
|
static int FAST_FUNC
|
|
getoptscmd(int argc, char **argv)
|
|
{
|
|
char **optbase;
|
|
|
|
if (argc < 3)
|
|
ash_msg_and_raise_error("usage: getopts optstring var [arg]");
|
|
if (argc == 3) {
|
|
optbase = shellparam.p;
|
|
if ((unsigned)shellparam.optind > shellparam.nparam + 1) {
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
}
|
|
} else {
|
|
optbase = &argv[3];
|
|
if ((unsigned)shellparam.optind > argc - 2) {
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
}
|
|
}
|
|
|
|
return getopts(argv[1], argv[2], optbase);
|
|
}
|
|
#endif /* ASH_GETOPTS */
|
|
|
|
|
|
/* ============ Shell parser */
|
|
|
|
struct heredoc {
|
|
struct heredoc *next; /* next here document in list */
|
|
union node *here; /* redirection node */
|
|
char *eofmark; /* string indicating end of input */
|
|
smallint striptabs; /* if set, strip leading tabs */
|
|
};
|
|
|
|
static smallint tokpushback; /* last token pushed back */
|
|
static smallint quoteflag; /* set if (part of) last token was quoted */
|
|
static token_id_t lasttoken; /* last token read (integer id Txxx) */
|
|
static struct heredoc *heredoclist; /* list of here documents to read */
|
|
static char *wordtext; /* text of last word returned by readtoken */
|
|
static struct nodelist *backquotelist;
|
|
static union node *redirnode;
|
|
static struct heredoc *heredoc;
|
|
|
|
static const char *
|
|
tokname(char *buf, int tok)
|
|
{
|
|
if (tok < TSEMI)
|
|
return tokname_array[tok];
|
|
sprintf(buf, "\"%s\"", tokname_array[tok]);
|
|
return buf;
|
|
}
|
|
|
|
/* raise_error_unexpected_syntax:
|
|
* Called when an unexpected token is read during the parse. The argument
|
|
* is the token that is expected, or -1 if more than one type of token can
|
|
* occur at this point.
|
|
*/
|
|
static void raise_error_unexpected_syntax(int) NORETURN;
|
|
static void
|
|
raise_error_unexpected_syntax(int token)
|
|
{
|
|
char msg[64];
|
|
char buf[16];
|
|
int l;
|
|
|
|
l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken));
|
|
if (token >= 0)
|
|
sprintf(msg + l, " (expecting %s)", tokname(buf, token));
|
|
raise_error_syntax(msg);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* parsing is heavily cross-recursive, need these forward decls */
|
|
static union node *andor(void);
|
|
static union node *pipeline(void);
|
|
static union node *parse_command(void);
|
|
static void parseheredoc(void);
|
|
static int peektoken(void);
|
|
static int readtoken(void);
|
|
|
|
static union node *
|
|
list(int nlflag)
|
|
{
|
|
union node *n1, *n2, *n3;
|
|
int tok;
|
|
|
|
n1 = NULL;
|
|
for (;;) {
|
|
switch (peektoken()) {
|
|
case TNL:
|
|
if (!(nlflag & 1))
|
|
break;
|
|
parseheredoc();
|
|
return n1;
|
|
|
|
case TEOF:
|
|
if (!n1 && (nlflag & 1))
|
|
n1 = NODE_EOF;
|
|
parseheredoc();
|
|
return n1;
|
|
}
|
|
|
|
checkkwd = CHKNL | CHKKWD | CHKALIAS;
|
|
if (nlflag == 2 && ((1 << peektoken()) & tokendlist))
|
|
return n1;
|
|
nlflag |= 2;
|
|
|
|
n2 = andor();
|
|
tok = readtoken();
|
|
if (tok == TBACKGND) {
|
|
if (n2->type == NPIPE) {
|
|
n2->npipe.pipe_backgnd = 1;
|
|
} else {
|
|
if (n2->type != NREDIR) {
|
|
n3 = stzalloc(sizeof(struct nredir));
|
|
n3->nredir.n = n2;
|
|
/*n3->nredir.redirect = NULL; - stzalloc did it */
|
|
n2 = n3;
|
|
}
|
|
n2->type = NBACKGND;
|
|
}
|
|
}
|
|
if (n1 == NULL) {
|
|
n1 = n2;
|
|
} else {
|
|
n3 = stzalloc(sizeof(struct nbinary));
|
|
n3->type = NSEMI;
|
|
n3->nbinary.ch1 = n1;
|
|
n3->nbinary.ch2 = n2;
|
|
n1 = n3;
|
|
}
|
|
switch (tok) {
|
|
case TNL:
|
|
case TEOF:
|
|
tokpushback = 1;
|
|
/* fall through */
|
|
case TBACKGND:
|
|
case TSEMI:
|
|
break;
|
|
default:
|
|
if ((nlflag & 1))
|
|
raise_error_unexpected_syntax(-1);
|
|
tokpushback = 1;
|
|
return n1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static union node *
|
|
andor(void)
|
|
{
|
|
union node *n1, *n2, *n3;
|
|
int t;
|
|
|
|
n1 = pipeline();
|
|
for (;;) {
|
|
t = readtoken();
|
|
if (t == TAND) {
|
|
t = NAND;
|
|
} else if (t == TOR) {
|
|
t = NOR;
|
|
} else {
|
|
tokpushback = 1;
|
|
return n1;
|
|
}
|
|
checkkwd = CHKNL | CHKKWD | CHKALIAS;
|
|
n2 = pipeline();
|
|
n3 = stzalloc(sizeof(struct nbinary));
|
|
n3->type = t;
|
|
n3->nbinary.ch1 = n1;
|
|
n3->nbinary.ch2 = n2;
|
|
n1 = n3;
|
|
}
|
|
}
|
|
|
|
static union node *
|
|
pipeline(void)
|
|
{
|
|
union node *n1, *n2, *pipenode;
|
|
struct nodelist *lp, *prev;
|
|
int negate;
|
|
|
|
negate = 0;
|
|
TRACE(("pipeline: entered\n"));
|
|
if (readtoken() == TNOT) {
|
|
negate = !negate;
|
|
checkkwd = CHKKWD | CHKALIAS;
|
|
} else
|
|
tokpushback = 1;
|
|
n1 = parse_command();
|
|
if (readtoken() == TPIPE) {
|
|
pipenode = stzalloc(sizeof(struct npipe));
|
|
pipenode->type = NPIPE;
|
|
/*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
|
|
lp = stzalloc(sizeof(struct nodelist));
|
|
pipenode->npipe.cmdlist = lp;
|
|
lp->n = n1;
|
|
do {
|
|
prev = lp;
|
|
lp = stzalloc(sizeof(struct nodelist));
|
|
checkkwd = CHKNL | CHKKWD | CHKALIAS;
|
|
lp->n = parse_command();
|
|
prev->next = lp;
|
|
} while (readtoken() == TPIPE);
|
|
lp->next = NULL;
|
|
n1 = pipenode;
|
|
}
|
|
tokpushback = 1;
|
|
if (negate) {
|
|
n2 = stzalloc(sizeof(struct nnot));
|
|
n2->type = NNOT;
|
|
n2->nnot.com = n1;
|
|
return n2;
|
|
}
|
|
return n1;
|
|
}
|
|
|
|
static union node *
|
|
makename(void)
|
|
{
|
|
union node *n;
|
|
|
|
n = stzalloc(sizeof(struct narg));
|
|
n->type = NARG;
|
|
/*n->narg.next = NULL; - stzalloc did it */
|
|
n->narg.text = wordtext;
|
|
n->narg.backquote = backquotelist;
|
|
return n;
|
|
}
|
|
|
|
static void
|
|
fixredir(union node *n, const char *text, int err)
|
|
{
|
|
int fd;
|
|
|
|
TRACE(("Fix redir %s %d\n", text, err));
|
|
if (!err)
|
|
n->ndup.vname = NULL;
|
|
|
|
fd = bb_strtou(text, NULL, 10);
|
|
if (!errno && fd >= 0)
|
|
n->ndup.dupfd = fd;
|
|
else if (LONE_DASH(text))
|
|
n->ndup.dupfd = -1;
|
|
else {
|
|
if (err)
|
|
raise_error_syntax("bad fd number");
|
|
n->ndup.vname = makename();
|
|
}
|
|
}
|
|
|
|
static void
|
|
parsefname(void)
|
|
{
|
|
union node *n = redirnode;
|
|
|
|
if (n->type == NHERE)
|
|
checkkwd = CHKEOFMARK;
|
|
if (readtoken() != TWORD)
|
|
raise_error_unexpected_syntax(-1);
|
|
if (n->type == NHERE) {
|
|
struct heredoc *here = heredoc;
|
|
struct heredoc *p;
|
|
|
|
if (quoteflag == 0)
|
|
n->type = NXHERE;
|
|
TRACE(("Here document %d\n", n->type));
|
|
rmescapes(wordtext, 0, NULL);
|
|
here->eofmark = wordtext;
|
|
here->next = NULL;
|
|
if (heredoclist == NULL)
|
|
heredoclist = here;
|
|
else {
|
|
for (p = heredoclist; p->next; p = p->next)
|
|
continue;
|
|
p->next = here;
|
|
}
|
|
} else if (n->type == NTOFD || n->type == NFROMFD) {
|
|
fixredir(n, wordtext, 0);
|
|
} else {
|
|
n->nfile.fname = makename();
|
|
}
|
|
}
|
|
|
|
static union node *
|
|
simplecmd(void)
|
|
{
|
|
union node *args, **app;
|
|
union node *n = NULL;
|
|
union node *vars, **vpp;
|
|
union node **rpp, *redir;
|
|
int savecheckkwd;
|
|
int savelinno;
|
|
#if BASH_TEST2
|
|
smallint double_brackets_flag = 0;
|
|
#endif
|
|
IF_BASH_FUNCTION(smallint function_flag = 0;)
|
|
|
|
args = NULL;
|
|
app = &args;
|
|
vars = NULL;
|
|
vpp = &vars;
|
|
redir = NULL;
|
|
rpp = &redir;
|
|
|
|
savecheckkwd = CHKALIAS;
|
|
savelinno = g_parsefile->linno;
|
|
for (;;) {
|
|
int t;
|
|
checkkwd = savecheckkwd;
|
|
t = readtoken();
|
|
switch (t) {
|
|
#if BASH_FUNCTION
|
|
case TFUNCTION:
|
|
if (peektoken() != TWORD)
|
|
raise_error_unexpected_syntax(TWORD);
|
|
function_flag = 1;
|
|
break;
|
|
#endif
|
|
#if BASH_TEST2
|
|
case TAND: /* "&&" */
|
|
case TOR: /* "||" */
|
|
if (!double_brackets_flag) {
|
|
tokpushback = 1;
|
|
goto out;
|
|
}
|
|
wordtext = (char *) (t == TAND ? "-a" : "-o");
|
|
#endif
|
|
case TWORD:
|
|
n = stzalloc(sizeof(struct narg));
|
|
n->type = NARG;
|
|
/*n->narg.next = NULL; - stzalloc did it */
|
|
n->narg.text = wordtext;
|
|
#if BASH_TEST2
|
|
if (strcmp("[[", wordtext) == 0)
|
|
double_brackets_flag = 1;
|
|
else if (strcmp("]]", wordtext) == 0)
|
|
double_brackets_flag = 0;
|
|
#endif
|
|
n->narg.backquote = backquotelist;
|
|
if (savecheckkwd && isassignment(wordtext)) {
|
|
*vpp = n;
|
|
vpp = &n->narg.next;
|
|
} else {
|
|
*app = n;
|
|
app = &n->narg.next;
|
|
savecheckkwd = 0;
|
|
}
|
|
#if BASH_FUNCTION
|
|
if (function_flag) {
|
|
checkkwd = CHKNL | CHKKWD;
|
|
switch (peektoken()) {
|
|
case TBEGIN:
|
|
case TIF:
|
|
case TCASE:
|
|
case TUNTIL:
|
|
case TWHILE:
|
|
case TFOR:
|
|
goto do_func;
|
|
case TLP:
|
|
function_flag = 0;
|
|
break;
|
|
# if BASH_TEST2
|
|
case TWORD:
|
|
if (strcmp("[[", wordtext) == 0)
|
|
goto do_func;
|
|
/* fall through */
|
|
# endif
|
|
default:
|
|
raise_error_unexpected_syntax(-1);
|
|
}
|
|
}
|
|
#endif
|
|
break;
|
|
case TREDIR:
|
|
*rpp = n = redirnode;
|
|
rpp = &n->nfile.next;
|
|
parsefname(); /* read name of redirection file */
|
|
break;
|
|
case TLP:
|
|
IF_BASH_FUNCTION(do_func:)
|
|
if (args && app == &args->narg.next
|
|
&& !vars && !redir
|
|
) {
|
|
struct builtincmd *bcmd;
|
|
const char *name;
|
|
|
|
/* We have a function */
|
|
if (IF_BASH_FUNCTION(!function_flag &&) readtoken() != TRP)
|
|
raise_error_unexpected_syntax(TRP);
|
|
name = n->narg.text;
|
|
if (!goodname(name)
|
|
|| ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
|
|
) {
|
|
raise_error_syntax("bad function name");
|
|
}
|
|
n->type = NDEFUN;
|
|
checkkwd = CHKNL | CHKKWD | CHKALIAS;
|
|
n->ndefun.text = n->narg.text;
|
|
n->ndefun.linno = g_parsefile->linno;
|
|
n->ndefun.body = parse_command();
|
|
return n;
|
|
}
|
|
IF_BASH_FUNCTION(function_flag = 0;)
|
|
/* fall through */
|
|
default:
|
|
tokpushback = 1;
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
*app = NULL;
|
|
*vpp = NULL;
|
|
*rpp = NULL;
|
|
n = stzalloc(sizeof(struct ncmd));
|
|
if (NCMD != 0)
|
|
n->type = NCMD;
|
|
n->ncmd.linno = savelinno;
|
|
n->ncmd.args = args;
|
|
n->ncmd.assign = vars;
|
|
n->ncmd.redirect = redir;
|
|
return n;
|
|
}
|
|
|
|
static union node *
|
|
parse_command(void)
|
|
{
|
|
union node *n1, *n2;
|
|
union node *ap, **app;
|
|
union node *cp, **cpp;
|
|
union node *redir, **rpp;
|
|
union node **rpp2;
|
|
int t;
|
|
int savelinno;
|
|
|
|
redir = NULL;
|
|
rpp2 = &redir;
|
|
|
|
savelinno = g_parsefile->linno;
|
|
|
|
switch (readtoken()) {
|
|
default:
|
|
raise_error_unexpected_syntax(-1);
|
|
/* NOTREACHED */
|
|
case TIF:
|
|
n1 = stzalloc(sizeof(struct nif));
|
|
n1->type = NIF;
|
|
n1->nif.test = list(0);
|
|
if (readtoken() != TTHEN)
|
|
raise_error_unexpected_syntax(TTHEN);
|
|
n1->nif.ifpart = list(0);
|
|
n2 = n1;
|
|
while (readtoken() == TELIF) {
|
|
n2->nif.elsepart = stzalloc(sizeof(struct nif));
|
|
n2 = n2->nif.elsepart;
|
|
n2->type = NIF;
|
|
n2->nif.test = list(0);
|
|
if (readtoken() != TTHEN)
|
|
raise_error_unexpected_syntax(TTHEN);
|
|
n2->nif.ifpart = list(0);
|
|
}
|
|
if (lasttoken == TELSE)
|
|
n2->nif.elsepart = list(0);
|
|
else {
|
|
n2->nif.elsepart = NULL;
|
|
tokpushback = 1;
|
|
}
|
|
t = TFI;
|
|
break;
|
|
case TWHILE:
|
|
case TUNTIL: {
|
|
int got;
|
|
n1 = stzalloc(sizeof(struct nbinary));
|
|
n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
|
|
n1->nbinary.ch1 = list(0);
|
|
got = readtoken();
|
|
if (got != TDO) {
|
|
TRACE(("expecting DO got '%s' %s\n", tokname_array[got],
|
|
got == TWORD ? wordtext : ""));
|
|
raise_error_unexpected_syntax(TDO);
|
|
}
|
|
n1->nbinary.ch2 = list(0);
|
|
t = TDONE;
|
|
break;
|
|
}
|
|
case TFOR:
|
|
if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
|
|
raise_error_syntax("bad for loop variable");
|
|
n1 = stzalloc(sizeof(struct nfor));
|
|
n1->type = NFOR;
|
|
n1->nfor.linno = savelinno;
|
|
n1->nfor.var = wordtext;
|
|
checkkwd = CHKNL | CHKKWD | CHKALIAS;
|
|
if (readtoken() == TIN) {
|
|
app = ≈
|
|
while (readtoken() == TWORD) {
|
|
n2 = stzalloc(sizeof(struct narg));
|
|
n2->type = NARG;
|
|
/*n2->narg.next = NULL; - stzalloc did it */
|
|
n2->narg.text = wordtext;
|
|
n2->narg.backquote = backquotelist;
|
|
*app = n2;
|
|
app = &n2->narg.next;
|
|
}
|
|
*app = NULL;
|
|
n1->nfor.args = ap;
|
|
if (lasttoken != TNL && lasttoken != TSEMI)
|
|
raise_error_unexpected_syntax(-1);
|
|
} else {
|
|
n2 = stzalloc(sizeof(struct narg));
|
|
n2->type = NARG;
|
|
/*n2->narg.next = NULL; - stzalloc did it */
|
|
n2->narg.text = (char *)dolatstr;
|
|
/*n2->narg.backquote = NULL;*/
|
|
n1->nfor.args = n2;
|
|
/*
|
|
* Newline or semicolon here is optional (but note
|
|
* that the original Bourne shell only allowed NL).
|
|
*/
|
|
if (lasttoken != TSEMI)
|
|
tokpushback = 1;
|
|
}
|
|
checkkwd = CHKNL | CHKKWD | CHKALIAS;
|
|
if (readtoken() != TDO)
|
|
raise_error_unexpected_syntax(TDO);
|
|
n1->nfor.body = list(0);
|
|
t = TDONE;
|
|
break;
|
|
case TCASE:
|
|
n1 = stzalloc(sizeof(struct ncase));
|
|
n1->type = NCASE;
|
|
n1->ncase.linno = savelinno;
|
|
if (readtoken() != TWORD)
|
|
raise_error_unexpected_syntax(TWORD);
|
|
n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
|
|
n2->type = NARG;
|
|
/*n2->narg.next = NULL; - stzalloc did it */
|
|
n2->narg.text = wordtext;
|
|
n2->narg.backquote = backquotelist;
|
|
checkkwd = CHKNL | CHKKWD | CHKALIAS;
|
|
if (readtoken() != TIN)
|
|
raise_error_unexpected_syntax(TIN);
|
|
cpp = &n1->ncase.cases;
|
|
next_case:
|
|
checkkwd = CHKNL | CHKKWD;
|
|
t = readtoken();
|
|
while (t != TESAC) {
|
|
if (lasttoken == TLP)
|
|
readtoken();
|
|
*cpp = cp = stzalloc(sizeof(struct nclist));
|
|
cp->type = NCLIST;
|
|
app = &cp->nclist.pattern;
|
|
for (;;) {
|
|
*app = ap = stzalloc(sizeof(struct narg));
|
|
ap->type = NARG;
|
|
/*ap->narg.next = NULL; - stzalloc did it */
|
|
ap->narg.text = wordtext;
|
|
ap->narg.backquote = backquotelist;
|
|
if (readtoken() != TPIPE)
|
|
break;
|
|
app = &ap->narg.next;
|
|
readtoken();
|
|
}
|
|
//ap->narg.next = NULL;
|
|
if (lasttoken != TRP)
|
|
raise_error_unexpected_syntax(TRP);
|
|
cp->nclist.body = list(2);
|
|
|
|
cpp = &cp->nclist.next;
|
|
|
|
checkkwd = CHKNL | CHKKWD;
|
|
t = readtoken();
|
|
if (t != TESAC) {
|
|
if (t != TENDCASE)
|
|
raise_error_unexpected_syntax(TENDCASE);
|
|
goto next_case;
|
|
}
|
|
}
|
|
*cpp = NULL;
|
|
goto redir;
|
|
case TLP:
|
|
n1 = stzalloc(sizeof(struct nredir));
|
|
n1->type = NSUBSHELL;
|
|
n1->nredir.linno = savelinno;
|
|
n1->nredir.n = list(0);
|
|
/*n1->nredir.redirect = NULL; - stzalloc did it */
|
|
t = TRP;
|
|
break;
|
|
case TBEGIN:
|
|
n1 = list(0);
|
|
t = TEND;
|
|
break;
|
|
IF_BASH_FUNCTION(case TFUNCTION:)
|
|
case TWORD:
|
|
case TREDIR:
|
|
tokpushback = 1;
|
|
return simplecmd();
|
|
}
|
|
|
|
if (readtoken() != t)
|
|
raise_error_unexpected_syntax(t);
|
|
|
|
redir:
|
|
/* Now check for redirection which may follow command */
|
|
checkkwd = CHKKWD | CHKALIAS;
|
|
rpp = rpp2;
|
|
while (readtoken() == TREDIR) {
|
|
*rpp = n2 = redirnode;
|
|
rpp = &n2->nfile.next;
|
|
parsefname();
|
|
}
|
|
tokpushback = 1;
|
|
*rpp = NULL;
|
|
if (redir) {
|
|
if (n1->type != NSUBSHELL) {
|
|
n2 = stzalloc(sizeof(struct nredir));
|
|
n2->type = NREDIR;
|
|
n2->nredir.linno = savelinno;
|
|
n2->nredir.n = n1;
|
|
n1 = n2;
|
|
}
|
|
n1->nredir.redirect = redir;
|
|
}
|
|
return n1;
|
|
}
|
|
|
|
#if BASH_DOLLAR_SQUOTE
|
|
static int
|
|
decode_dollar_squote(void)
|
|
{
|
|
static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
|
|
int c, cnt;
|
|
char *p;
|
|
char buf[4];
|
|
|
|
c = pgetc();
|
|
p = strchr(C_escapes, c);
|
|
if (p) {
|
|
buf[0] = c;
|
|
p = buf;
|
|
cnt = 3;
|
|
if ((unsigned char)(c - '0') <= 7) { /* \ooo */
|
|
do {
|
|
c = pgetc();
|
|
*++p = c;
|
|
} while ((unsigned char)(c - '0') <= 7 && --cnt);
|
|
pungetc();
|
|
} else if (c == 'x') { /* \xHH */
|
|
do {
|
|
c = pgetc();
|
|
*++p = c;
|
|
} while (isxdigit(c) && --cnt);
|
|
pungetc();
|
|
if (cnt == 3) { /* \x but next char is "bad" */
|
|
c = 'x';
|
|
goto unrecognized;
|
|
}
|
|
} else { /* simple seq like \\ or \t */
|
|
p++;
|
|
}
|
|
*p = '\0';
|
|
p = buf;
|
|
c = bb_process_escape_sequence((void*)&p);
|
|
} else { /* unrecognized "\z": print both chars unless ' or " */
|
|
if (c != '\'' && c != '"') {
|
|
unrecognized:
|
|
c |= 0x100; /* "please encode \, then me" */
|
|
}
|
|
}
|
|
return c;
|
|
}
|
|
#endif
|
|
|
|
/* Used by expandstr to get here-doc like behaviour. */
|
|
#define FAKEEOFMARK ((char*)(uintptr_t)1)
|
|
|
|
static ALWAYS_INLINE int
|
|
realeofmark(const char *eofmark)
|
|
{
|
|
return eofmark && eofmark != FAKEEOFMARK;
|
|
}
|
|
|
|
/*
|
|
* If eofmark is NULL, read a word or a redirection symbol. If eofmark
|
|
* is not NULL, read a here document. In the latter case, eofmark is the
|
|
* word which marks the end of the document and striptabs is true if
|
|
* leading tabs should be stripped from the document. The argument c
|
|
* is the first character of the input token or document.
|
|
*
|
|
* Because C does not have internal subroutines, I have simulated them
|
|
* using goto's to implement the subroutine linkage. The following macros
|
|
* will run code that appears at the end of readtoken1.
|
|
*/
|
|
#define CHECKEND() {goto checkend; checkend_return:;}
|
|
#define PARSEREDIR() {goto parseredir; parseredir_return:;}
|
|
#define PARSESUB() {goto parsesub; parsesub_return:;}
|
|
#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
|
|
#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
|
|
#define PARSEARITH() {goto parsearith; parsearith_return:;}
|
|
static int
|
|
readtoken1(int c, int syntax, char *eofmark, int striptabs)
|
|
{
|
|
/* NB: syntax parameter fits into smallint */
|
|
/* c parameter is an unsigned char or PEOF or PEOA */
|
|
char *out;
|
|
size_t len;
|
|
struct nodelist *bqlist;
|
|
smallint quotef;
|
|
smallint oldstyle;
|
|
smallint pssyntax; /* we are expanding a prompt string */
|
|
IF_BASH_DOLLAR_SQUOTE(smallint bash_dollar_squote = 0;)
|
|
/* syntax stack */
|
|
struct synstack synbase = { };
|
|
struct synstack *synstack = &synbase;
|
|
|
|
#if ENABLE_ASH_EXPAND_PRMT
|
|
pssyntax = (syntax == PSSYNTAX);
|
|
if (pssyntax)
|
|
syntax = DQSYNTAX;
|
|
#else
|
|
pssyntax = 0; /* constant */
|
|
#endif
|
|
synstack->syntax = syntax;
|
|
|
|
if (syntax == DQSYNTAX)
|
|
synstack->dblquote = 1;
|
|
quotef = 0;
|
|
bqlist = NULL;
|
|
|
|
STARTSTACKSTR(out);
|
|
loop:
|
|
/* For each line, until end of word */
|
|
CHECKEND(); /* set c to PEOF if at end of here document */
|
|
for (;;) { /* until end of line or end of word */
|
|
CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
|
|
switch (SIT(c, synstack->syntax)) {
|
|
case CNL: /* '\n' */
|
|
if (synstack->syntax == BASESYNTAX
|
|
&& !synstack->varnest
|
|
) {
|
|
goto endword; /* exit outer loop */
|
|
}
|
|
USTPUTC(c, out);
|
|
nlprompt();
|
|
c = pgetc();
|
|
goto loop; /* continue outer loop */
|
|
case CWORD:
|
|
USTPUTC(c, out);
|
|
break;
|
|
case CCTL:
|
|
#if BASH_DOLLAR_SQUOTE
|
|
if (c == '\\' && bash_dollar_squote) {
|
|
c = decode_dollar_squote();
|
|
if (c == '\0') {
|
|
/* skip $'\000', $'\x00' (like bash) */
|
|
break;
|
|
}
|
|
if (c & 0x100) {
|
|
/* Unknown escape. Encode as '\z' */
|
|
c = (unsigned char)c;
|
|
if (eofmark == NULL || synstack->dblquote)
|
|
USTPUTC(CTLESC, out);
|
|
USTPUTC('\\', out);
|
|
}
|
|
}
|
|
#endif
|
|
if (!eofmark || synstack->dblquote || synstack->varnest)
|
|
USTPUTC(CTLESC, out);
|
|
USTPUTC(c, out);
|
|
break;
|
|
case CBACK: /* backslash */
|
|
c = pgetc_without_PEOA();
|
|
if (c == PEOF) {
|
|
USTPUTC(CTLESC, out);
|
|
USTPUTC('\\', out);
|
|
pungetc();
|
|
} else if (c == '\n') {
|
|
nlprompt();
|
|
} else {
|
|
if (pssyntax && c == '$') {
|
|
USTPUTC(CTLESC, out);
|
|
USTPUTC('\\', out);
|
|
}
|
|
/* Backslash is retained if we are in "str"
|
|
* and next char isn't dquote-special.
|
|
*/
|
|
if (synstack->dblquote
|
|
&& c != '\\'
|
|
&& c != '`'
|
|
&& c != '$'
|
|
&& (c != '"' || (eofmark != NULL && !synstack->varnest))
|
|
&& (c != '}' || !synstack->varnest)
|
|
) {
|
|
USTPUTC(CTLESC, out); /* protect '\' from glob */
|
|
USTPUTC('\\', out);
|
|
}
|
|
USTPUTC(CTLESC, out);
|
|
USTPUTC(c, out);
|
|
quotef = 1;
|
|
}
|
|
break;
|
|
case CSQUOTE:
|
|
synstack->syntax = SQSYNTAX;
|
|
quotemark:
|
|
if (eofmark == NULL) {
|
|
USTPUTC(CTLQUOTEMARK, out);
|
|
}
|
|
break;
|
|
case CDQUOTE:
|
|
synstack->syntax = DQSYNTAX;
|
|
synstack->dblquote = 1;
|
|
toggledq:
|
|
if (synstack->varnest)
|
|
synstack->innerdq ^= 1;
|
|
goto quotemark;
|
|
case CENDQUOTE:
|
|
IF_BASH_DOLLAR_SQUOTE(bash_dollar_squote = 0;)
|
|
if (eofmark != NULL && synstack->varnest == 0) {
|
|
USTPUTC(c, out);
|
|
break;
|
|
}
|
|
|
|
if (synstack->dqvarnest == 0) {
|
|
synstack->syntax = BASESYNTAX;
|
|
synstack->dblquote = 0;
|
|
}
|
|
|
|
quotef = 1;
|
|
|
|
if (c == '"')
|
|
goto toggledq;
|
|
|
|
goto quotemark;
|
|
case CVAR: /* '$' */
|
|
PARSESUB(); /* parse substitution */
|
|
break;
|
|
case CENDVAR: /* '}' */
|
|
if (!synstack->innerdq && synstack->varnest > 0) {
|
|
if (!--synstack->varnest && synstack->varpushed)
|
|
synstack_pop(&synstack);
|
|
else if (synstack->dqvarnest > 0)
|
|
synstack->dqvarnest--;
|
|
c = CTLENDVAR;
|
|
}
|
|
USTPUTC(c, out);
|
|
break;
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
case CLP: /* '(' in arithmetic */
|
|
synstack->parenlevel++;
|
|
USTPUTC(c, out);
|
|
break;
|
|
case CRP: /* ')' in arithmetic */
|
|
if (synstack->parenlevel > 0) {
|
|
synstack->parenlevel--;
|
|
} else {
|
|
if (pgetc_eatbnl() == ')') {
|
|
c = CTLENDARI;
|
|
synstack_pop(&synstack);
|
|
} else {
|
|
/*
|
|
* unbalanced parens
|
|
* (don't 2nd guess - no error)
|
|
*/
|
|
pungetc();
|
|
}
|
|
}
|
|
USTPUTC(c, out);
|
|
break;
|
|
#endif
|
|
case CBQUOTE: /* '`' */
|
|
if (checkkwd & CHKEOFMARK) {
|
|
quotef = 1;
|
|
USTPUTC('`', out);
|
|
break;
|
|
}
|
|
|
|
PARSEBACKQOLD();
|
|
break;
|
|
case CENDFILE:
|
|
goto endword; /* exit outer loop */
|
|
case CIGN:
|
|
break;
|
|
default:
|
|
if (synstack->varnest == 0) {
|
|
#if BASH_REDIR_OUTPUT
|
|
if (c == '&') {
|
|
//Can't call pgetc_eatbnl() here, this requires three-deep pungetc()
|
|
if (pgetc() == '>')
|
|
c = 0x100 + '>'; /* flag &> */
|
|
pungetc();
|
|
}
|
|
#endif
|
|
goto endword; /* exit outer loop */
|
|
}
|
|
IF_ASH_ALIAS(if (c != PEOA))
|
|
USTPUTC(c, out);
|
|
}
|
|
c = pgetc();
|
|
} /* for (;;) */
|
|
endword:
|
|
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
if (synstack->syntax == ARISYNTAX)
|
|
raise_error_syntax("missing '))'");
|
|
#endif
|
|
if (synstack->syntax != BASESYNTAX && eofmark == NULL)
|
|
raise_error_syntax("unterminated quoted string");
|
|
if (synstack->varnest != 0) {
|
|
/* { */
|
|
raise_error_syntax("missing '}'");
|
|
}
|
|
USTPUTC('\0', out);
|
|
len = out - (char *)stackblock();
|
|
out = stackblock();
|
|
if (eofmark == NULL) {
|
|
if ((c == '>' || c == '<' IF_BASH_REDIR_OUTPUT( || c == 0x100 + '>'))
|
|
&& quotef == 0
|
|
) {
|
|
if (isdigit_str9(out)) {
|
|
PARSEREDIR(); /* passed as params: out, c */
|
|
lasttoken = TREDIR;
|
|
return lasttoken;
|
|
}
|
|
/* else: non-number X seen, interpret it
|
|
* as "NNNX>file" = "NNNX >file" */
|
|
}
|
|
pungetc();
|
|
}
|
|
quoteflag = quotef;
|
|
backquotelist = bqlist;
|
|
grabstackblock(len);
|
|
wordtext = out;
|
|
lasttoken = TWORD;
|
|
return lasttoken;
|
|
/* end of readtoken routine */
|
|
|
|
/*
|
|
* Check to see whether we are at the end of the here document. When this
|
|
* is called, c is set to the first character of the next input line. If
|
|
* we are at the end of the here document, this routine sets the c to PEOF.
|
|
*/
|
|
checkend: {
|
|
if (realeofmark(eofmark)) {
|
|
int markloc;
|
|
char *p;
|
|
|
|
#if ENABLE_ASH_ALIAS
|
|
if (c == PEOA)
|
|
c = pgetc_without_PEOA();
|
|
#endif
|
|
if (striptabs) {
|
|
while (c == '\t') {
|
|
c = pgetc_without_PEOA();
|
|
}
|
|
}
|
|
|
|
markloc = out - (char *)stackblock();
|
|
for (p = eofmark; STPUTC(c, out), *p; p++) {
|
|
if (c != *p)
|
|
goto more_heredoc;
|
|
|
|
c = pgetc_without_PEOA();
|
|
}
|
|
|
|
if (c == '\n' || c == PEOF) {
|
|
c = PEOF;
|
|
g_parsefile->linno++;
|
|
needprompt = doprompt;
|
|
} else {
|
|
int len_here;
|
|
|
|
more_heredoc:
|
|
p = (char *)stackblock() + markloc + 1;
|
|
len_here = out - p;
|
|
|
|
if (len_here) {
|
|
len_here -= (c >= PEOF);
|
|
c = p[-1];
|
|
|
|
if (len_here) {
|
|
char *str;
|
|
|
|
str = alloca(len_here + 1);
|
|
*(char *)mempcpy(str, p, len_here) = '\0';
|
|
|
|
pushstring(str, NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
STADJUST((char *)stackblock() + markloc - out, out);
|
|
}
|
|
goto checkend_return;
|
|
}
|
|
|
|
/*
|
|
* Parse a redirection operator. The variable "out" points to a string
|
|
* specifying the fd to be redirected. The variable "c" contains the
|
|
* first character of the redirection operator.
|
|
*/
|
|
parseredir: {
|
|
/* out is already checked to be a valid number or "" */
|
|
int fd = (*out == '\0' ? -1 : atoi(out));
|
|
union node *np;
|
|
|
|
np = stzalloc(sizeof(struct nfile));
|
|
if (c == '>') {
|
|
np->nfile.fd = 1;
|
|
c = pgetc_eatbnl();
|
|
if (c == '>')
|
|
np->type = NAPPEND;
|
|
else if (c == '|')
|
|
np->type = NCLOBBER;
|
|
else if (c == '&')
|
|
np->type = NTOFD;
|
|
/* it also can be NTO2 (>&file), but we can't figure it out yet */
|
|
else {
|
|
np->type = NTO;
|
|
pungetc();
|
|
}
|
|
}
|
|
#if BASH_REDIR_OUTPUT
|
|
else if (c == 0x100 + '>') { /* this flags &> redirection */
|
|
np->nfile.fd = 1;
|
|
pgetc(); /* this is '>', no need to check */
|
|
np->type = NTO2;
|
|
}
|
|
#endif
|
|
else { /* c == '<' */
|
|
/*np->nfile.fd = 0; - stzalloc did it */
|
|
c = pgetc_eatbnl();
|
|
switch (c) {
|
|
case '<':
|
|
if (sizeof(struct nfile) != sizeof(struct nhere)) {
|
|
np = stzalloc(sizeof(struct nhere));
|
|
/*np->nfile.fd = 0; - stzalloc did it */
|
|
}
|
|
np->type = NHERE;
|
|
heredoc = stzalloc(sizeof(struct heredoc));
|
|
heredoc->here = np;
|
|
c = pgetc_eatbnl();
|
|
if (c == '-') {
|
|
heredoc->striptabs = 1;
|
|
} else {
|
|
/*heredoc->striptabs = 0; - stzalloc did it */
|
|
pungetc();
|
|
}
|
|
break;
|
|
|
|
case '&':
|
|
np->type = NFROMFD;
|
|
break;
|
|
|
|
case '>':
|
|
np->type = NFROMTO;
|
|
break;
|
|
|
|
default:
|
|
np->type = NFROM;
|
|
pungetc();
|
|
break;
|
|
}
|
|
}
|
|
if (fd >= 0)
|
|
np->nfile.fd = fd;
|
|
redirnode = np;
|
|
goto parseredir_return;
|
|
}
|
|
|
|
/*
|
|
* Parse a substitution. At this point, we have read the dollar sign
|
|
* and nothing else.
|
|
*/
|
|
|
|
/* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
|
|
* (assuming ascii char codes, as the original implementation did) */
|
|
#define is_special(c) \
|
|
(((unsigned)(c) - 33 < 32) \
|
|
&& ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
|
|
parsesub: {
|
|
unsigned char subtype;
|
|
int typeloc;
|
|
|
|
c = pgetc_eatbnl();
|
|
if ((checkkwd & CHKEOFMARK)
|
|
|| c > 255 /* PEOA or PEOF */
|
|
|| (c != '(' && c != '{' && !is_name(c) && !is_special(c))
|
|
) {
|
|
#if BASH_DOLLAR_SQUOTE
|
|
if (synstack->syntax != DQSYNTAX && c == '\'')
|
|
bash_dollar_squote = 1;
|
|
else
|
|
#endif
|
|
USTPUTC('$', out);
|
|
pungetc();
|
|
} else if (c == '(') {
|
|
/* $(command) or $((arith)) */
|
|
if (pgetc_eatbnl() == '(') {
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
PARSEARITH();
|
|
#else
|
|
raise_error_syntax("support for $((arith)) is disabled");
|
|
#endif
|
|
} else {
|
|
pungetc();
|
|
PARSEBACKQNEW();
|
|
}
|
|
} else {
|
|
/* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
|
|
smalluint newsyn = synstack->syntax;
|
|
|
|
USTPUTC(CTLVAR, out);
|
|
typeloc = out - (char *)stackblock();
|
|
STADJUST(1, out);
|
|
subtype = VSNORMAL;
|
|
if (c == '{') {
|
|
c = pgetc_eatbnl();
|
|
subtype = 0;
|
|
}
|
|
varname:
|
|
if (is_name(c)) {
|
|
/* $[{[#]]NAME[}] */
|
|
do {
|
|
STPUTC(c, out);
|
|
c = pgetc_eatbnl();
|
|
} while (is_in_name(c));
|
|
} else if (isdigit(c)) {
|
|
/* $[{[#]]NUM[}] */
|
|
do {
|
|
STPUTC(c, out);
|
|
c = pgetc_eatbnl();
|
|
} while (isdigit(c));
|
|
} else if (c != '}') {
|
|
/* $[{[#]]<specialchar>[}] */
|
|
int cc = c;
|
|
|
|
c = pgetc_eatbnl();
|
|
if (!subtype && cc == '#') {
|
|
subtype = VSLENGTH;
|
|
if (c == '_' || isalnum(c))
|
|
goto varname;
|
|
cc = c;
|
|
c = pgetc_eatbnl();
|
|
if (cc == '}' || c != '}') {
|
|
pungetc();
|
|
subtype = 0;
|
|
c = cc;
|
|
cc = '#';
|
|
}
|
|
}
|
|
|
|
if (!is_special(cc)) {
|
|
if (subtype == VSLENGTH)
|
|
subtype = 0;
|
|
goto badsub;
|
|
}
|
|
|
|
USTPUTC(cc, out);
|
|
} else
|
|
goto badsub;
|
|
|
|
if (c != '}' && subtype == VSLENGTH) {
|
|
/* ${#VAR didn't end with } */
|
|
goto badsub;
|
|
}
|
|
|
|
if (subtype == 0) {
|
|
static const char types[] ALIGN1 = "}-+?=";
|
|
/* ${VAR...} but not $VAR or ${#VAR} */
|
|
/* c == first char after VAR */
|
|
int cc = c;
|
|
|
|
switch (c) {
|
|
case ':':
|
|
c = pgetc_eatbnl();
|
|
#if BASH_SUBSTR
|
|
/* This check is only needed to not misinterpret
|
|
* ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD}
|
|
* constructs.
|
|
*/
|
|
if (!strchr(types, c)) {
|
|
subtype = VSSUBSTR;
|
|
pungetc();
|
|
break; /* "goto badsub" is bigger (!) */
|
|
}
|
|
#endif
|
|
subtype = VSNUL;
|
|
/*FALLTHROUGH*/
|
|
default: {
|
|
const char *p = strchr(types, c);
|
|
if (p == NULL)
|
|
break;
|
|
subtype |= p - types + VSNORMAL;
|
|
break;
|
|
}
|
|
case '%':
|
|
case '#':
|
|
subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
|
|
c = pgetc_eatbnl();
|
|
if (c == cc)
|
|
subtype++;
|
|
else
|
|
pungetc();
|
|
|
|
newsyn = BASESYNTAX;
|
|
break;
|
|
#if BASH_PATTERN_SUBST
|
|
case '/':
|
|
/* ${v/[/]pattern/repl} */
|
|
//TODO: encode pattern and repl separately.
|
|
// Currently cases like: v=1;echo ${v/$((1/1))/ONE}
|
|
// are broken (should print "ONE")
|
|
subtype = VSREPLACE;
|
|
newsyn = BASESYNTAX;
|
|
c = pgetc_eatbnl();
|
|
if (c != '/')
|
|
goto badsub;
|
|
subtype++; /* VSREPLACEALL */
|
|
break;
|
|
#endif
|
|
}
|
|
} else {
|
|
badsub:
|
|
pungetc();
|
|
}
|
|
|
|
if (newsyn == ARISYNTAX)
|
|
newsyn = DQSYNTAX;
|
|
|
|
if ((newsyn != synstack->syntax || synstack->innerdq)
|
|
&& subtype != VSNORMAL
|
|
) {
|
|
synstack_push(&synstack,
|
|
synstack->prev ?: alloca(sizeof(*synstack)),
|
|
newsyn);
|
|
|
|
synstack->varpushed = 1;
|
|
synstack->dblquote = newsyn != BASESYNTAX;
|
|
}
|
|
|
|
((unsigned char *)stackblock())[typeloc] = subtype;
|
|
if (subtype != VSNORMAL) {
|
|
synstack->varnest++;
|
|
if (synstack->dblquote)
|
|
synstack->dqvarnest++;
|
|
}
|
|
STPUTC('=', out);
|
|
}
|
|
goto parsesub_return;
|
|
}
|
|
|
|
/*
|
|
* Called to parse command substitutions. Newstyle is set if the command
|
|
* is enclosed inside $(...); nlpp is a pointer to the head of the linked
|
|
* list of commands (passed by reference), and savelen is the number of
|
|
* characters on the top of the stack which must be preserved.
|
|
*/
|
|
parsebackq: {
|
|
struct nodelist **nlpp;
|
|
union node *n;
|
|
char *str;
|
|
size_t savelen;
|
|
smallint saveprompt = 0;
|
|
|
|
str = NULL;
|
|
savelen = out - (char *)stackblock();
|
|
if (savelen > 0) {
|
|
/*
|
|
* FIXME: this can allocate very large block on stack and SEGV.
|
|
* Example:
|
|
* echo "..<100kbytes>..`true` $(true) `true` ..."
|
|
* allocates 100kb for every command subst. With about
|
|
* a hundred command substitutions stack overflows.
|
|
* With larger prepended string, SEGV happens sooner.
|
|
*/
|
|
str = alloca(savelen);
|
|
memcpy(str, stackblock(), savelen);
|
|
}
|
|
|
|
if (oldstyle) {
|
|
/* We must read until the closing backquote, giving special
|
|
* treatment to some slashes, and then push the string and
|
|
* reread it as input, interpreting it normally.
|
|
*/
|
|
char *pout;
|
|
size_t psavelen;
|
|
char *pstr;
|
|
|
|
STARTSTACKSTR(pout);
|
|
for (;;) {
|
|
int pc;
|
|
|
|
setprompt_if(needprompt, 2);
|
|
pc = pgetc_eatbnl();
|
|
switch (pc) {
|
|
case '`':
|
|
goto done;
|
|
|
|
case '\\':
|
|
pc = pgetc(); /* or pgetc_eatbnl()? why (example)? */
|
|
if (pc != '\\' && pc != '`' && pc != '$'
|
|
&& (!synstack->dblquote || pc != '"')
|
|
) {
|
|
STPUTC('\\', pout);
|
|
}
|
|
if (pc <= 255 /* not PEOA or PEOF */) {
|
|
break;
|
|
}
|
|
/* fall through */
|
|
|
|
case PEOF:
|
|
IF_ASH_ALIAS(case PEOA:)
|
|
raise_error_syntax("EOF in backquote substitution");
|
|
|
|
case '\n':
|
|
nlnoprompt();
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
STPUTC(pc, pout);
|
|
}
|
|
done:
|
|
STPUTC('\0', pout);
|
|
psavelen = pout - (char *)stackblock();
|
|
if (psavelen > 0) {
|
|
pstr = grabstackstr(pout);
|
|
setinputstring(pstr);
|
|
}
|
|
}
|
|
nlpp = &bqlist;
|
|
while (*nlpp)
|
|
nlpp = &(*nlpp)->next;
|
|
*nlpp = stzalloc(sizeof(**nlpp));
|
|
/* (*nlpp)->next = NULL; - stzalloc did it */
|
|
|
|
if (oldstyle) {
|
|
saveprompt = doprompt;
|
|
doprompt = 0;
|
|
}
|
|
|
|
n = list(2);
|
|
|
|
if (oldstyle)
|
|
doprompt = saveprompt;
|
|
else if (readtoken() != TRP)
|
|
raise_error_unexpected_syntax(TRP);
|
|
|
|
(*nlpp)->n = n;
|
|
if (oldstyle) {
|
|
/*
|
|
* Start reading from old file again, ignoring any pushed back
|
|
* tokens left from the backquote parsing
|
|
*/
|
|
popfile();
|
|
tokpushback = 0;
|
|
}
|
|
while (stackblocksize() <= savelen)
|
|
growstackblock();
|
|
STARTSTACKSTR(out);
|
|
if (str) {
|
|
memcpy(out, str, savelen);
|
|
STADJUST(savelen, out);
|
|
}
|
|
USTPUTC(CTLBACKQ, out);
|
|
if (oldstyle)
|
|
goto parsebackq_oldreturn;
|
|
goto parsebackq_newreturn;
|
|
}
|
|
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
/*
|
|
* Parse an arithmetic expansion (indicate start of one and set state)
|
|
*/
|
|
parsearith: {
|
|
|
|
synstack_push(&synstack,
|
|
synstack->prev ?: alloca(sizeof(*synstack)),
|
|
ARISYNTAX);
|
|
synstack->dblquote = 1;
|
|
USTPUTC(CTLARI, out);
|
|
goto parsearith_return;
|
|
}
|
|
#endif
|
|
} /* end of readtoken */
|
|
|
|
/*
|
|
* Read the next input token.
|
|
* If the token is a word, we set backquotelist to the list of cmds in
|
|
* backquotes. We set quoteflag to true if any part of the word was
|
|
* quoted.
|
|
* If the token is TREDIR, then we set redirnode to a structure containing
|
|
* the redirection.
|
|
*
|
|
* [Change comment: here documents and internal procedures]
|
|
* [Readtoken shouldn't have any arguments. Perhaps we should make the
|
|
* word parsing code into a separate routine. In this case, readtoken
|
|
* doesn't need to have any internal procedures, but parseword does.
|
|
* We could also make parseoperator in essence the main routine, and
|
|
* have parseword (readtoken1?) handle both words and redirection.]
|
|
*/
|
|
#define NEW_xxreadtoken
|
|
#ifdef NEW_xxreadtoken
|
|
/* singles must be first! */
|
|
static const char xxreadtoken_chars[7] ALIGN1 = {
|
|
'\n', '(', ')', /* singles */
|
|
'&', '|', ';', /* doubles */
|
|
0
|
|
};
|
|
|
|
#define xxreadtoken_singles 3
|
|
#define xxreadtoken_doubles 3
|
|
|
|
static const char xxreadtoken_tokens[] ALIGN1 = {
|
|
TNL, TLP, TRP, /* only single occurrence allowed */
|
|
TBACKGND, TPIPE, TSEMI, /* if single occurrence */
|
|
TEOF, /* corresponds to trailing nul */
|
|
TAND, TOR, TENDCASE /* if double occurrence */
|
|
};
|
|
|
|
static int
|
|
xxreadtoken(void)
|
|
{
|
|
int c;
|
|
|
|
if (tokpushback) {
|
|
tokpushback = 0;
|
|
return lasttoken;
|
|
}
|
|
setprompt_if(needprompt, 2);
|
|
for (;;) { /* until token or start of word found */
|
|
c = pgetc_eatbnl();
|
|
if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
|
|
continue;
|
|
|
|
if (c == '#') {
|
|
while ((c = pgetc()) != '\n' && c != PEOF)
|
|
continue;
|
|
pungetc();
|
|
} else if (c == '\\') {
|
|
break; /* return readtoken1(...) */
|
|
} else {
|
|
const char *p;
|
|
|
|
p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
|
|
if (c != PEOF) {
|
|
if (c == '\n') {
|
|
nlnoprompt();
|
|
}
|
|
|
|
p = strchr(xxreadtoken_chars, c);
|
|
if (p == NULL)
|
|
break; /* return readtoken1(...) */
|
|
|
|
if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
|
|
int cc = pgetc_eatbnl();
|
|
if (cc == c) { /* double occurrence? */
|
|
p += xxreadtoken_doubles + 1;
|
|
} else {
|
|
pungetc();
|
|
#if BASH_REDIR_OUTPUT
|
|
if (c == '&' && cc == '>') /* &> */
|
|
break; /* return readtoken1(...) */
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
|
|
return lasttoken;
|
|
}
|
|
} /* for (;;) */
|
|
|
|
return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
|
|
}
|
|
#else /* old xxreadtoken */
|
|
#define RETURN(token) return lasttoken = token
|
|
static int
|
|
xxreadtoken(void)
|
|
{
|
|
int c;
|
|
|
|
if (tokpushback) {
|
|
tokpushback = 0;
|
|
return lasttoken;
|
|
}
|
|
setprompt_if(needprompt, 2);
|
|
for (;;) { /* until token or start of word found */
|
|
c = pgetc_eatbnl();
|
|
switch (c) {
|
|
case ' ': case '\t':
|
|
IF_ASH_ALIAS(case PEOA:)
|
|
continue;
|
|
case '#':
|
|
while ((c = pgetc()) != '\n' && c != PEOF)
|
|
continue;
|
|
pungetc();
|
|
continue;
|
|
case '\n':
|
|
nlnoprompt();
|
|
RETURN(TNL);
|
|
case PEOF:
|
|
RETURN(TEOF);
|
|
case '&':
|
|
if (pgetc_eatbnl() == '&')
|
|
RETURN(TAND);
|
|
pungetc();
|
|
RETURN(TBACKGND);
|
|
case '|':
|
|
if (pgetc_eatbnl() == '|')
|
|
RETURN(TOR);
|
|
pungetc();
|
|
RETURN(TPIPE);
|
|
case ';':
|
|
if (pgetc_eatbnl() == ';')
|
|
RETURN(TENDCASE);
|
|
pungetc();
|
|
RETURN(TSEMI);
|
|
case '(':
|
|
RETURN(TLP);
|
|
case ')':
|
|
RETURN(TRP);
|
|
}
|
|
break;
|
|
}
|
|
return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
|
|
#undef RETURN
|
|
}
|
|
#endif /* old xxreadtoken */
|
|
|
|
static int
|
|
readtoken(void)
|
|
{
|
|
int t;
|
|
int kwd = checkkwd;
|
|
#if DEBUG
|
|
smallint alreadyseen = tokpushback;
|
|
#endif
|
|
|
|
#if ENABLE_ASH_ALIAS
|
|
top:
|
|
#endif
|
|
|
|
t = xxreadtoken();
|
|
|
|
/*
|
|
* eat newlines
|
|
*/
|
|
if (kwd & CHKNL) {
|
|
while (t == TNL) {
|
|
parseheredoc();
|
|
t = xxreadtoken();
|
|
}
|
|
}
|
|
|
|
if (t != TWORD || quoteflag) {
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* check for keywords
|
|
*/
|
|
if (kwd & CHKKWD) {
|
|
const char *const *pp;
|
|
|
|
pp = findkwd(wordtext);
|
|
if (pp) {
|
|
lasttoken = t = pp - tokname_array;
|
|
TRACE(("keyword '%s' recognized\n", tokname_array[t]));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (checkkwd & CHKALIAS) {
|
|
#if ENABLE_ASH_ALIAS
|
|
struct alias *ap;
|
|
ap = lookupalias(wordtext, 1);
|
|
if (ap != NULL) {
|
|
if (*ap->val) {
|
|
pushstring(ap->val, ap);
|
|
}
|
|
goto top;
|
|
}
|
|
#endif
|
|
}
|
|
out:
|
|
checkkwd = 0;
|
|
#if DEBUG
|
|
if (!alreadyseen)
|
|
TRACE(("token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
|
|
else
|
|
TRACE(("reread token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : ""));
|
|
#endif
|
|
return t;
|
|
}
|
|
|
|
static int
|
|
peektoken(void)
|
|
{
|
|
int t;
|
|
|
|
t = readtoken();
|
|
tokpushback = 1;
|
|
return t;
|
|
}
|
|
|
|
/*
|
|
* Read and parse a command. Returns NODE_EOF on end of file.
|
|
* (NULL is a valid parse tree indicating a blank line.)
|
|
*/
|
|
static union node *
|
|
parsecmd(int interact)
|
|
{
|
|
tokpushback = 0;
|
|
checkkwd = 0;
|
|
heredoclist = 0;
|
|
doprompt = interact;
|
|
setprompt_if(doprompt, doprompt);
|
|
needprompt = 0;
|
|
return list(1);
|
|
}
|
|
|
|
/*
|
|
* Input any here documents.
|
|
*/
|
|
static void
|
|
parseheredoc(void)
|
|
{
|
|
struct heredoc *here;
|
|
union node *n;
|
|
|
|
here = heredoclist;
|
|
heredoclist = NULL;
|
|
|
|
while (here) {
|
|
tokpushback = 0;
|
|
setprompt_if(needprompt, 2);
|
|
readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
|
|
here->eofmark, here->striptabs);
|
|
n = stzalloc(sizeof(struct narg));
|
|
n->narg.type = NARG;
|
|
/*n->narg.next = NULL; - stzalloc did it */
|
|
n->narg.text = wordtext;
|
|
n->narg.backquote = backquotelist;
|
|
here->here->nhere.doc = n;
|
|
here = here->next;
|
|
}
|
|
}
|
|
|
|
|
|
static const char *
|
|
expandstr(const char *ps, int syntax_type)
|
|
{
|
|
union node n;
|
|
int saveprompt;
|
|
struct parsefile *file_stop = g_parsefile;
|
|
volatile int saveint;
|
|
struct jmploc *volatile savehandler = exception_handler;
|
|
struct jmploc jmploc;
|
|
|
|
/* XXX Fix (char *) cast. */
|
|
setinputstring((char *)ps);
|
|
|
|
saveprompt = doprompt;
|
|
doprompt = 0;
|
|
|
|
/* readtoken1() might die horribly.
|
|
* Try a prompt with syntactically wrong command:
|
|
* PS1='$(date "+%H:%M:%S) > '
|
|
*/
|
|
SAVE_INT(saveint);
|
|
if (setjmp(jmploc.loc) == 0) {
|
|
exception_handler = &jmploc;
|
|
readtoken1(pgetc(), syntax_type, FAKEEOFMARK, 0);
|
|
}
|
|
exception_handler = savehandler;
|
|
RESTORE_INT(saveint);
|
|
|
|
doprompt = saveprompt;
|
|
|
|
/* Try: PS1='`xxx(`' */
|
|
unwindfiles(file_stop);
|
|
|
|
n.narg.type = NARG;
|
|
n.narg.next = NULL;
|
|
n.narg.text = wordtext;
|
|
n.narg.backquote = backquotelist;
|
|
|
|
/* expandarg() might fail too:
|
|
* PS1='$((123+))'
|
|
*/
|
|
SAVE_INT(saveint);
|
|
if (setjmp(jmploc.loc) == 0) {
|
|
exception_handler = &jmploc;
|
|
expandarg(&n, NULL, EXP_QUOTED);
|
|
} else if (exception_type == EXEXIT) {
|
|
exitshell();
|
|
}
|
|
exception_handler = savehandler;
|
|
RESTORE_INT(saveint);
|
|
|
|
return stackblock();
|
|
}
|
|
|
|
static inline int
|
|
parser_eof(void)
|
|
{
|
|
return tokpushback && lasttoken == TEOF;
|
|
}
|
|
|
|
/*
|
|
* Execute a command or commands contained in a string.
|
|
*/
|
|
static int
|
|
evalstring(char *s, int flags)
|
|
{
|
|
struct jmploc *volatile savehandler;
|
|
struct jmploc jmploc;
|
|
int ex;
|
|
|
|
union node *n;
|
|
struct stackmark smark;
|
|
int status;
|
|
|
|
s = sstrdup(s);
|
|
setinputstring(s);
|
|
setstackmark(&smark);
|
|
|
|
status = 0;
|
|
/* On exception inside execution loop, we must popfile().
|
|
* Try interactively:
|
|
* readonly a=a
|
|
* command eval "a=b" # throws "is read only" error
|
|
* "command BLTIN" is not supposed to abort (even in non-interactive use).
|
|
* But if we skip popfile(), we hit EOF in eval's string, and exit.
|
|
*/
|
|
savehandler = exception_handler;
|
|
ex = setjmp(jmploc.loc);
|
|
if (ex)
|
|
goto out;
|
|
exception_handler = &jmploc;
|
|
|
|
while ((n = parsecmd(0)) != NODE_EOF) {
|
|
int i;
|
|
|
|
i = evaltree(n, flags & ~(parser_eof() ? 0 : EV_EXIT));
|
|
if (n)
|
|
status = i;
|
|
popstackmark(&smark);
|
|
if (evalskip)
|
|
break;
|
|
}
|
|
out:
|
|
popstackmark(&smark);
|
|
popfile();
|
|
stunalloc(s);
|
|
|
|
exception_handler = savehandler;
|
|
if (ex)
|
|
longjmp(exception_handler->loc, ex);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* The eval command.
|
|
*/
|
|
static int FAST_FUNC
|
|
evalcmd(int argc UNUSED_PARAM, char **argv, int flags)
|
|
{
|
|
char *p;
|
|
char *concat;
|
|
|
|
if (argv[1]) {
|
|
p = argv[1];
|
|
argv += 2;
|
|
if (argv[0]) {
|
|
STARTSTACKSTR(concat);
|
|
for (;;) {
|
|
concat = stack_putstr(p, concat);
|
|
p = *argv++;
|
|
if (p == NULL)
|
|
break;
|
|
STPUTC(' ', concat);
|
|
}
|
|
STPUTC('\0', concat);
|
|
p = grabstackstr(concat);
|
|
}
|
|
return evalstring(p, flags & EV_TESTED);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read and execute commands.
|
|
* "Top" is nonzero for the top level command loop;
|
|
* it turns on prompting if the shell is interactive.
|
|
*/
|
|
static int
|
|
cmdloop(int top)
|
|
{
|
|
union node *n;
|
|
struct stackmark smark;
|
|
int inter;
|
|
int status = 0;
|
|
int numeof = 0;
|
|
|
|
TRACE(("cmdloop(%d) called\n", top));
|
|
for (;;) {
|
|
int skip;
|
|
|
|
setstackmark(&smark);
|
|
#if JOBS
|
|
if (doing_jobctl)
|
|
showjobs(SHOW_CHANGED|SHOW_STDERR);
|
|
#endif
|
|
inter = 0;
|
|
if (iflag && top) {
|
|
inter++;
|
|
chkmail();
|
|
}
|
|
n = parsecmd(inter);
|
|
#if DEBUG
|
|
if (DEBUG > 2 && debug && (n != NODE_EOF))
|
|
showtree(n);
|
|
#endif
|
|
if (n == NODE_EOF) {
|
|
if (!top || numeof >= 50)
|
|
break;
|
|
if (!stoppedjobs()) {
|
|
if (!Iflag)
|
|
break;
|
|
out2str("\nUse \"exit\" to leave shell.\n");
|
|
}
|
|
numeof++;
|
|
} else if (nflag == 0) {
|
|
int i;
|
|
|
|
/* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
|
|
job_warning >>= 1;
|
|
numeof = 0;
|
|
i = evaltree(n, 0);
|
|
if (n)
|
|
status = i;
|
|
}
|
|
popstackmark(&smark);
|
|
skip = evalskip;
|
|
|
|
if (skip) {
|
|
evalskip &= ~SKIPFUNC;
|
|
break;
|
|
}
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Take commands from a file. To be compatible we should do a path
|
|
* search for the file, which is necessary to find sub-commands.
|
|
*/
|
|
static char *
|
|
find_dot_file(char *name)
|
|
{
|
|
char *fullname;
|
|
const char *path = pathval();
|
|
struct stat statb;
|
|
|
|
/* don't try this for absolute or relative paths */
|
|
if (strchr(name, '/'))
|
|
return name;
|
|
|
|
while ((fullname = path_advance(&path, name)) != NULL) {
|
|
if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
|
|
/*
|
|
* Don't bother freeing here, since it will
|
|
* be freed by the caller.
|
|
*/
|
|
return fullname;
|
|
}
|
|
if (fullname != name)
|
|
stunalloc(fullname);
|
|
}
|
|
/* not found in PATH */
|
|
|
|
#if ENABLE_ASH_BASH_SOURCE_CURDIR
|
|
return name;
|
|
#else
|
|
ash_msg_and_raise_error("%s: not found", name);
|
|
/* NOTREACHED */
|
|
#endif
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
dotcmd(int argc_ UNUSED_PARAM, char **argv_ UNUSED_PARAM)
|
|
{
|
|
/* "false; . empty_file; echo $?" should print 0, not 1: */
|
|
int status = 0;
|
|
char *fullname;
|
|
char **argv;
|
|
char *args_need_save;
|
|
volatile struct shparam saveparam;
|
|
|
|
//???
|
|
// struct strlist *sp;
|
|
// for (sp = cmdenviron; sp; sp = sp->next)
|
|
// setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
|
|
|
|
nextopt(nullstr); /* handle possible "--" */
|
|
argv = argptr;
|
|
|
|
if (!argv[0]) {
|
|
/* bash says: "bash: .: filename argument required" */
|
|
return 2; /* bash compat */
|
|
}
|
|
|
|
/* This aborts if file isn't found, which is POSIXly correct.
|
|
* bash returns exitcode 1 instead.
|
|
*/
|
|
fullname = find_dot_file(argv[0]);
|
|
argv++;
|
|
args_need_save = argv[0];
|
|
if (args_need_save) { /* ". FILE ARGS", and ARGS are not empty */
|
|
int argc;
|
|
saveparam = shellparam;
|
|
shellparam.malloced = 0;
|
|
argc = 1;
|
|
while (argv[argc])
|
|
argc++;
|
|
shellparam.nparam = argc;
|
|
shellparam.p = argv;
|
|
};
|
|
|
|
/* This aborts if file can't be opened, which is POSIXly correct.
|
|
* bash returns exitcode 1 instead.
|
|
*/
|
|
setinputfile(fullname, INPUT_PUSH_FILE);
|
|
commandname = fullname;
|
|
status = cmdloop(0);
|
|
popfile();
|
|
|
|
if (args_need_save) {
|
|
freeparam(&shellparam);
|
|
shellparam = saveparam;
|
|
};
|
|
|
|
return status;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
exitcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
if (stoppedjobs())
|
|
return 0;
|
|
if (argv[1])
|
|
exitstatus = number(argv[1]);
|
|
raise_exception(EXEXIT);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Read a file containing shell functions.
|
|
*/
|
|
static void
|
|
readcmdfile(char *name)
|
|
{
|
|
setinputfile(name, INPUT_PUSH_FILE);
|
|
cmdloop(0);
|
|
popfile();
|
|
}
|
|
|
|
|
|
/* ============ find_command inplementation */
|
|
|
|
/*
|
|
* Resolve a command name. If you change this routine, you may have to
|
|
* change the shellexec routine as well.
|
|
*/
|
|
static void
|
|
find_command(char *name, struct cmdentry *entry, int act, const char *path)
|
|
{
|
|
struct tblentry *cmdp;
|
|
int idx;
|
|
int prev;
|
|
char *fullname;
|
|
struct stat statb;
|
|
int e;
|
|
int updatetbl;
|
|
struct builtincmd *bcmd;
|
|
|
|
/* If name contains a slash, don't use PATH or hash table */
|
|
if (strchr(name, '/') != NULL) {
|
|
entry->u.index = -1;
|
|
if (act & DO_ABS) {
|
|
while (stat(name, &statb) < 0) {
|
|
#ifdef SYSV
|
|
if (errno == EINTR)
|
|
continue;
|
|
#endif
|
|
entry->cmdtype = CMDUNKNOWN;
|
|
return;
|
|
}
|
|
}
|
|
entry->cmdtype = CMDNORMAL;
|
|
return;
|
|
}
|
|
|
|
/* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
|
|
|
|
updatetbl = (path == pathval());
|
|
if (!updatetbl) {
|
|
act |= DO_ALTPATH;
|
|
if (strstr(path, "%builtin") != NULL)
|
|
act |= DO_ALTBLTIN;
|
|
}
|
|
|
|
/* If name is in the table, check answer will be ok */
|
|
cmdp = cmdlookup(name, 0);
|
|
if (cmdp != NULL) {
|
|
int bit;
|
|
|
|
switch (cmdp->cmdtype) {
|
|
default:
|
|
#if DEBUG
|
|
abort();
|
|
#endif
|
|
case CMDNORMAL:
|
|
bit = DO_ALTPATH;
|
|
break;
|
|
case CMDFUNCTION:
|
|
bit = DO_NOFUNC;
|
|
break;
|
|
case CMDBUILTIN:
|
|
bit = DO_ALTBLTIN;
|
|
break;
|
|
}
|
|
if (act & bit) {
|
|
updatetbl = 0;
|
|
cmdp = NULL;
|
|
} else if (cmdp->rehash == 0)
|
|
/* if not invalidated by cd, we're done */
|
|
goto success;
|
|
}
|
|
|
|
/* If %builtin not in path, check for builtin next */
|
|
bcmd = find_builtin(name);
|
|
if (bcmd) {
|
|
if (IS_BUILTIN_REGULAR(bcmd))
|
|
goto builtin_success;
|
|
if (act & DO_ALTPATH) {
|
|
if (!(act & DO_ALTBLTIN))
|
|
goto builtin_success;
|
|
} else if (builtinloc <= 0) {
|
|
goto builtin_success;
|
|
}
|
|
}
|
|
|
|
#if ENABLE_FEATURE_SH_STANDALONE
|
|
{
|
|
int applet_no = find_applet_by_name(name);
|
|
if (applet_no >= 0) {
|
|
entry->cmdtype = CMDNORMAL;
|
|
entry->u.index = -2 - applet_no;
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* We have to search path. */
|
|
prev = -1; /* where to start */
|
|
if (cmdp && cmdp->rehash) { /* doing a rehash */
|
|
if (cmdp->cmdtype == CMDBUILTIN)
|
|
prev = builtinloc;
|
|
else
|
|
prev = cmdp->param.index;
|
|
}
|
|
|
|
e = ENOENT;
|
|
idx = -1;
|
|
loop:
|
|
while ((fullname = path_advance(&path, name)) != NULL) {
|
|
stunalloc(fullname);
|
|
/* NB: code below will still use fullname
|
|
* despite it being "unallocated" */
|
|
idx++;
|
|
if (pathopt) {
|
|
if (prefix(pathopt, "builtin")) {
|
|
if (bcmd)
|
|
goto builtin_success;
|
|
continue;
|
|
}
|
|
if ((act & DO_NOFUNC)
|
|
|| !prefix(pathopt, "func")
|
|
) { /* ignore unimplemented options */
|
|
continue;
|
|
}
|
|
}
|
|
/* if rehash, don't redo absolute path names */
|
|
if (fullname[0] == '/' && idx <= prev) {
|
|
if (idx < prev)
|
|
continue;
|
|
TRACE(("searchexec \"%s\": no change\n", name));
|
|
goto success;
|
|
}
|
|
while (stat(fullname, &statb) < 0) {
|
|
#ifdef SYSV
|
|
if (errno == EINTR)
|
|
continue;
|
|
#endif
|
|
if (errno != ENOENT && errno != ENOTDIR)
|
|
e = errno;
|
|
goto loop;
|
|
}
|
|
e = EACCES; /* if we fail, this will be the error */
|
|
if (!S_ISREG(statb.st_mode))
|
|
continue;
|
|
if (pathopt) { /* this is a %func directory */
|
|
stalloc(strlen(fullname) + 1);
|
|
/* NB: stalloc will return space pointed by fullname
|
|
* (because we don't have any intervening allocations
|
|
* between stunalloc above and this stalloc) */
|
|
readcmdfile(fullname);
|
|
cmdp = cmdlookup(name, 0);
|
|
if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
|
|
ash_msg_and_raise_error("%s not defined in %s", name, fullname);
|
|
stunalloc(fullname);
|
|
goto success;
|
|
}
|
|
TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
|
|
if (!updatetbl) {
|
|
entry->cmdtype = CMDNORMAL;
|
|
entry->u.index = idx;
|
|
return;
|
|
}
|
|
INT_OFF;
|
|
cmdp = cmdlookup(name, 1);
|
|
cmdp->cmdtype = CMDNORMAL;
|
|
cmdp->param.index = idx;
|
|
INT_ON;
|
|
goto success;
|
|
}
|
|
|
|
/* We failed. If there was an entry for this command, delete it */
|
|
if (cmdp && updatetbl)
|
|
delete_cmd_entry();
|
|
if (act & DO_ERR) {
|
|
#if ENABLE_ASH_BASH_NOT_FOUND_HOOK
|
|
struct tblentry *hookp = cmdlookup("command_not_found_handle", 0);
|
|
if (hookp && hookp->cmdtype == CMDFUNCTION) {
|
|
char *argv[3];
|
|
argv[0] = (char*) "command_not_found_handle";
|
|
argv[1] = name;
|
|
argv[2] = NULL;
|
|
evalfun(hookp->param.func, 2, argv, 0);
|
|
entry->cmdtype = CMDUNKNOWN;
|
|
return;
|
|
}
|
|
#endif
|
|
ash_msg("%s: %s", name, errmsg(e, "not found"));
|
|
}
|
|
entry->cmdtype = CMDUNKNOWN;
|
|
return;
|
|
|
|
builtin_success:
|
|
if (!updatetbl) {
|
|
entry->cmdtype = CMDBUILTIN;
|
|
entry->u.cmd = bcmd;
|
|
return;
|
|
}
|
|
INT_OFF;
|
|
cmdp = cmdlookup(name, 1);
|
|
cmdp->cmdtype = CMDBUILTIN;
|
|
cmdp->param.cmd = bcmd;
|
|
INT_ON;
|
|
success:
|
|
cmdp->rehash = 0;
|
|
entry->cmdtype = cmdp->cmdtype;
|
|
entry->u = cmdp->param;
|
|
}
|
|
|
|
|
|
/*
|
|
* The trap builtin.
|
|
*/
|
|
static int FAST_FUNC
|
|
trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
char *action;
|
|
char **ap;
|
|
int signo, exitcode;
|
|
|
|
nextopt(nullstr);
|
|
ap = argptr;
|
|
if (!*ap) {
|
|
for (signo = 0; signo < NSIG; signo++) {
|
|
char *tr = trap_ptr[signo];
|
|
if (tr) {
|
|
/* note: bash adds "SIG", but only if invoked
|
|
* as "bash". If called as "sh", or if set -o posix,
|
|
* then it prints short signal names.
|
|
* We are printing short names: */
|
|
out1fmt("trap -- %s %s\n",
|
|
single_quote(tr),
|
|
get_signame(signo));
|
|
/* trap_ptr != trap only if we are in special-cased `trap` code.
|
|
* In this case, we will exit very soon, no need to free(). */
|
|
/* if (trap_ptr != trap && tp[0]) */
|
|
/* free(tr); */
|
|
}
|
|
}
|
|
/*
|
|
if (trap_ptr != trap) {
|
|
free(trap_ptr);
|
|
trap_ptr = trap;
|
|
}
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
/* Why the second check?
|
|
* "trap NUM [sig2]..." is the same as "trap - NUM [sig2]..."
|
|
* In this case, NUM is signal no, not an action.
|
|
*/
|
|
action = NULL;
|
|
if (ap[1] && !is_number(ap[0]))
|
|
action = *ap++;
|
|
|
|
exitcode = 0;
|
|
while (*ap) {
|
|
signo = get_signum(*ap);
|
|
if (signo < 0) {
|
|
/* Mimic bash message exactly */
|
|
ash_msg("%s: invalid signal specification", *ap);
|
|
exitcode = 1;
|
|
goto next;
|
|
}
|
|
INT_OFF;
|
|
if (action) {
|
|
if (LONE_DASH(action))
|
|
action = NULL;
|
|
else {
|
|
if (action[0]) /* not NULL and not "" and not "-" */
|
|
may_have_traps = 1;
|
|
action = ckstrdup(action);
|
|
}
|
|
}
|
|
free(trap[signo]);
|
|
trap[signo] = action;
|
|
if (signo != 0)
|
|
setsignal(signo);
|
|
INT_ON;
|
|
next:
|
|
ap++;
|
|
}
|
|
return exitcode;
|
|
}
|
|
|
|
|
|
/* ============ Builtins */
|
|
|
|
#if ENABLE_ASH_HELP
|
|
static int FAST_FUNC
|
|
helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
unsigned col;
|
|
unsigned i;
|
|
|
|
out1fmt(
|
|
"Built-in commands:\n"
|
|
"------------------\n");
|
|
for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
|
|
col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
|
|
builtintab[i].name + 1);
|
|
if (col > 60) {
|
|
out1fmt("\n");
|
|
col = 0;
|
|
}
|
|
}
|
|
# if ENABLE_FEATURE_SH_STANDALONE
|
|
{
|
|
const char *a = applet_names;
|
|
while (*a) {
|
|
col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
|
|
if (col > 60) {
|
|
out1fmt("\n");
|
|
col = 0;
|
|
}
|
|
while (*a++ != '\0')
|
|
continue;
|
|
}
|
|
}
|
|
# endif
|
|
newline_and_flush(stdout);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
#if MAX_HISTORY
|
|
static int FAST_FUNC
|
|
historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
if (line_input_state)
|
|
show_history(line_input_state);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* The export and readonly commands.
|
|
*/
|
|
static int FAST_FUNC
|
|
exportcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct var *vp;
|
|
char *name;
|
|
const char *p;
|
|
char **aptr;
|
|
char opt;
|
|
int flag;
|
|
int flag_off;
|
|
|
|
/* "readonly" in bash accepts, but ignores -n.
|
|
* We do the same: it saves a conditional in nextopt's param.
|
|
*/
|
|
flag_off = 0;
|
|
while ((opt = nextopt("np")) != '\0') {
|
|
if (opt == 'n')
|
|
flag_off = VEXPORT;
|
|
}
|
|
flag = VEXPORT;
|
|
if (argv[0][0] == 'r') {
|
|
flag = VREADONLY;
|
|
flag_off = 0; /* readonly ignores -n */
|
|
}
|
|
flag_off = ~flag_off;
|
|
|
|
/*if (opt_p_not_specified) - bash doesn't check this. Try "export -p NAME" */
|
|
{
|
|
aptr = argptr;
|
|
name = *aptr;
|
|
if (name) {
|
|
do {
|
|
p = strchr(name, '=');
|
|
if (p != NULL) {
|
|
p++;
|
|
} else {
|
|
vp = *findvar(hashvar(name), name);
|
|
if (vp) {
|
|
vp->flags = ((vp->flags | flag) & flag_off);
|
|
continue;
|
|
}
|
|
}
|
|
setvar(name, p, (flag & flag_off));
|
|
} while ((name = *++aptr) != NULL);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* No arguments. Show the list of exported or readonly vars.
|
|
* -n is ignored.
|
|
*/
|
|
showvars(argv[0], flag, 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Delete a function if it exists.
|
|
*/
|
|
static void
|
|
unsetfunc(const char *name)
|
|
{
|
|
struct tblentry *cmdp;
|
|
|
|
cmdp = cmdlookup(name, 0);
|
|
if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
|
|
delete_cmd_entry();
|
|
}
|
|
|
|
/*
|
|
* The unset builtin command. We unset the function before we unset the
|
|
* variable to allow a function to be unset when there is a readonly variable
|
|
* with the same name.
|
|
*/
|
|
static int FAST_FUNC
|
|
unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
char **ap;
|
|
int i;
|
|
int flag = 0;
|
|
|
|
while ((i = nextopt("vf")) != 0) {
|
|
flag = i;
|
|
}
|
|
|
|
for (ap = argptr; *ap; ap++) {
|
|
if (flag != 'f') {
|
|
unsetvar(*ap);
|
|
continue;
|
|
}
|
|
if (flag != 'v')
|
|
unsetfunc(*ap);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const unsigned char timescmd_str[] ALIGN1 = {
|
|
' ', offsetof(struct tms, tms_utime),
|
|
'\n', offsetof(struct tms, tms_stime),
|
|
' ', offsetof(struct tms, tms_cutime),
|
|
'\n', offsetof(struct tms, tms_cstime),
|
|
0
|
|
};
|
|
static int FAST_FUNC
|
|
timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
unsigned clk_tck;
|
|
const unsigned char *p;
|
|
struct tms buf;
|
|
|
|
clk_tck = bb_clk_tck();
|
|
|
|
times(&buf);
|
|
p = timescmd_str;
|
|
do {
|
|
unsigned sec, frac;
|
|
unsigned long t;
|
|
t = *(clock_t *)(((char *) &buf) + p[1]);
|
|
sec = t / clk_tck;
|
|
frac = t % clk_tck;
|
|
out1fmt("%um%u.%03us%c",
|
|
sec / 60, sec % 60,
|
|
(frac * 1000) / clk_tck,
|
|
p[0]);
|
|
p += 2;
|
|
} while (*p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if ENABLE_FEATURE_SH_MATH
|
|
/*
|
|
* The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
|
|
* Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
|
|
*
|
|
* Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
|
|
*/
|
|
static int FAST_FUNC
|
|
letcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
arith_t i;
|
|
|
|
argv++;
|
|
if (!*argv)
|
|
ash_msg_and_raise_error("expression expected");
|
|
do {
|
|
i = ash_arith(*argv);
|
|
} while (*++argv);
|
|
|
|
return !i;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* The read builtin. Options:
|
|
* -r Do not interpret '\' specially
|
|
* -s Turn off echo (tty only)
|
|
* -n NCHARS Read NCHARS max
|
|
* -p PROMPT Display PROMPT on stderr (if input is from tty)
|
|
* -t SECONDS Timeout after SECONDS (tty or pipe only)
|
|
* -u FD Read from given FD instead of fd 0
|
|
* -d DELIM End on DELIM char, not newline
|
|
* This uses unbuffered input, which may be avoidable in some cases.
|
|
* TODO: bash also has:
|
|
* -a ARRAY Read into array[0],[1],etc
|
|
* -e Use line editing (tty only)
|
|
*/
|
|
static int FAST_FUNC
|
|
readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
struct builtin_read_params params;
|
|
const char *r;
|
|
int i;
|
|
|
|
memset(¶ms, 0, sizeof(params));
|
|
|
|
while ((i = nextopt("p:u:rt:n:sd:")) != '\0') {
|
|
switch (i) {
|
|
case 'p':
|
|
params.opt_p = optionarg;
|
|
break;
|
|
case 'n':
|
|
params.opt_n = optionarg;
|
|
break;
|
|
case 's':
|
|
params.read_flags |= BUILTIN_READ_SILENT;
|
|
break;
|
|
case 't':
|
|
params.opt_t = optionarg;
|
|
break;
|
|
case 'r':
|
|
params.read_flags |= BUILTIN_READ_RAW;
|
|
break;
|
|
case 'u':
|
|
params.opt_u = optionarg;
|
|
break;
|
|
#if BASH_READ_D
|
|
case 'd':
|
|
params.opt_d = optionarg;
|
|
break;
|
|
#endif
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
params.argv = argptr;
|
|
params.setvar = setvar0;
|
|
params.ifs = bltinlookup("IFS"); /* can be NULL */
|
|
|
|
/* "read -s" needs to save/restore termios, can't allow ^C
|
|
* to jump out of it.
|
|
*/
|
|
again:
|
|
INT_OFF;
|
|
r = shell_builtin_read(¶ms);
|
|
INT_ON;
|
|
|
|
if ((uintptr_t)r == 1 && errno == EINTR) {
|
|
/* To get SIGCHLD: sleep 1 & read x; echo $x
|
|
* Correct behavior is to not exit "read"
|
|
*/
|
|
if (pending_sig == 0)
|
|
goto again;
|
|
}
|
|
|
|
if ((uintptr_t)r > 1)
|
|
ash_msg_and_raise_error(r);
|
|
|
|
return (uintptr_t)r;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
static const char permuser[3] ALIGN1 = "ogu";
|
|
|
|
mode_t mask;
|
|
int symbolic_mode = 0;
|
|
|
|
while (nextopt("S") != '\0') {
|
|
symbolic_mode = 1;
|
|
}
|
|
|
|
INT_OFF;
|
|
mask = umask(0);
|
|
umask(mask);
|
|
INT_ON;
|
|
|
|
if (*argptr == NULL) {
|
|
if (symbolic_mode) {
|
|
char buf[sizeof(",u=rwx,g=rwx,o=rwx")];
|
|
char *p = buf;
|
|
int i;
|
|
|
|
i = 2;
|
|
for (;;) {
|
|
*p++ = ',';
|
|
*p++ = permuser[i];
|
|
*p++ = '=';
|
|
/* mask is 0..0uuugggooo. i=2 selects uuu bits */
|
|
if (!(mask & 0400)) *p++ = 'r';
|
|
if (!(mask & 0200)) *p++ = 'w';
|
|
if (!(mask & 0100)) *p++ = 'x';
|
|
mask <<= 3;
|
|
if (--i < 0)
|
|
break;
|
|
}
|
|
*p = '\0';
|
|
puts(buf + 1);
|
|
} else {
|
|
out1fmt("%04o\n", mask);
|
|
}
|
|
} else {
|
|
char *modestr = *argptr;
|
|
/* numeric umasks are taken as-is */
|
|
/* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
|
|
if (!isdigit(modestr[0]))
|
|
mask ^= 0777;
|
|
mask = bb_parse_mode(modestr, mask);
|
|
if ((unsigned)mask > 0777) {
|
|
ash_msg_and_raise_error("illegal mode: %s", modestr);
|
|
}
|
|
if (!isdigit(modestr[0]))
|
|
mask ^= 0777;
|
|
umask(mask);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int FAST_FUNC
|
|
ulimitcmd(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
return shell_builtin_ulimit(argv);
|
|
}
|
|
|
|
/* ============ main() and helpers */
|
|
|
|
/*
|
|
* Called to exit the shell.
|
|
*/
|
|
static void
|
|
exitshell(void)
|
|
{
|
|
struct jmploc loc;
|
|
char *p;
|
|
int status;
|
|
|
|
#if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
|
|
if (line_input_state)
|
|
save_history(line_input_state);
|
|
#endif
|
|
status = exitstatus;
|
|
TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
|
|
if (setjmp(loc.loc)) {
|
|
if (exception_type == EXEXIT)
|
|
status = exitstatus;
|
|
goto out;
|
|
}
|
|
exception_handler = &loc;
|
|
p = trap[0];
|
|
if (p) {
|
|
trap[0] = NULL;
|
|
evalskip = 0;
|
|
evalstring(p, 0);
|
|
/*free(p); - we'll exit soon */
|
|
}
|
|
out:
|
|
/* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}".
|
|
* our setjobctl(0) does not panic if tcsetpgrp fails inside it.
|
|
*/
|
|
setjobctl(0);
|
|
flush_stdout_stderr();
|
|
_exit(status);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* Don't inline: conserve stack of caller from having our locals too */
|
|
static NOINLINE void
|
|
init(void)
|
|
{
|
|
/* we will never free this */
|
|
basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ);
|
|
basepf.linno = 1;
|
|
|
|
sigmode[SIGCHLD - 1] = S_DFL; /* ensure we install handler even if it is SIG_IGNed */
|
|
setsignal(SIGCHLD);
|
|
|
|
/* bash re-enables SIGHUP which is SIG_IGNed on entry.
|
|
* Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
|
|
*/
|
|
signal(SIGHUP, SIG_DFL);
|
|
|
|
{
|
|
char **envp;
|
|
const char *p;
|
|
|
|
initvar();
|
|
for (envp = environ; envp && *envp; envp++) {
|
|
/* Used to have
|
|
* p = endofname(*envp);
|
|
* if (p != *envp && *p == '=') {
|
|
* here to weed out badly-named variables, but this breaks
|
|
* scenarios where people do want them passed to children:
|
|
* import os
|
|
* os.environ["test-test"]="test"
|
|
* if os.fork() == 0:
|
|
* os.execv("ash", [ 'ash', '-c', 'eval $(export -p); echo OK' ]) # fixes this
|
|
* os.execv("ash", [ 'ash', '-c', 'env | grep test-test' ]) # breaks this
|
|
*/
|
|
if (strchr(*envp, '=')) {
|
|
setvareq(*envp, VEXPORT|VTEXTFIXED);
|
|
}
|
|
}
|
|
|
|
setvareq((char*)defifsvar, VTEXTFIXED);
|
|
setvareq((char*)defoptindvar, VTEXTFIXED);
|
|
|
|
setvar0("PPID", utoa(getppid()));
|
|
#if BASH_SHLVL_VAR
|
|
p = lookupvar("SHLVL");
|
|
setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
|
|
#endif
|
|
#if BASH_HOSTNAME_VAR
|
|
if (!lookupvar("HOSTNAME")) {
|
|
struct utsname uts;
|
|
uname(&uts);
|
|
setvar0("HOSTNAME", uts.nodename);
|
|
}
|
|
#endif
|
|
p = lookupvar("PWD");
|
|
if (p) {
|
|
struct stat st1, st2;
|
|
if (p[0] != '/' || stat(p, &st1) || stat(".", &st2)
|
|
|| st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
|
|
) {
|
|
p = NULL;
|
|
}
|
|
}
|
|
setpwd(p, 0);
|
|
}
|
|
}
|
|
|
|
|
|
//usage:#define ash_trivial_usage
|
|
//usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS] / -s [ARGS]]"
|
|
//usage:#define ash_full_usage "\n\n"
|
|
//usage: "Unix shell interpreter"
|
|
|
|
/*
|
|
* Process the shell command line arguments.
|
|
*/
|
|
static int
|
|
procargs(char **argv)
|
|
{
|
|
int i;
|
|
const char *xminusc;
|
|
char **xargv;
|
|
int login_sh;
|
|
|
|
xargv = argv;
|
|
login_sh = xargv[0] && xargv[0][0] == '-';
|
|
#if NUM_SCRIPTS > 0
|
|
if (minusc)
|
|
goto setarg0;
|
|
#endif
|
|
arg0 = xargv[0];
|
|
/* if (xargv[0]) - mmm, this is always true! */
|
|
xargv++;
|
|
argptr = xargv;
|
|
for (i = 0; i < NOPTS; i++)
|
|
optlist[i] = 2;
|
|
if (options(&login_sh)) {
|
|
/* it already printed err message */
|
|
raise_exception(EXERROR);
|
|
}
|
|
xargv = argptr;
|
|
xminusc = minusc;
|
|
if (*xargv == NULL) {
|
|
if (xminusc)
|
|
ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
|
|
sflag = 1;
|
|
}
|
|
if (iflag == 2 /* no explicit -i given */
|
|
&& sflag == 1 /* -s given (or implied) */
|
|
&& !minusc /* bash compat: ash -sc 'echo $-' is not interactive (dash is) */
|
|
&& isatty(0) && isatty(1) /* we are on tty */
|
|
) {
|
|
iflag = 1;
|
|
}
|
|
if (mflag == 2)
|
|
mflag = iflag;
|
|
for (i = 0; i < NOPTS; i++)
|
|
if (optlist[i] == 2)
|
|
optlist[i] = 0;
|
|
#if DEBUG == 2
|
|
debug = 1;
|
|
#endif
|
|
/* POSIX 1003.2: first arg after "-c CMD" is $0, remainder $1... */
|
|
if (xminusc) {
|
|
minusc = *xargv++;
|
|
if (*xargv)
|
|
goto setarg0;
|
|
} else if (!sflag) {
|
|
setinputfile(*xargv, 0);
|
|
setarg0:
|
|
arg0 = *xargv++;
|
|
commandname = arg0;
|
|
}
|
|
|
|
shellparam.p = xargv;
|
|
#if ENABLE_ASH_GETOPTS
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
#endif
|
|
/* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
|
|
while (*xargv) {
|
|
shellparam.nparam++;
|
|
xargv++;
|
|
}
|
|
optschanged();
|
|
|
|
return login_sh;
|
|
}
|
|
|
|
/*
|
|
* Read /etc/profile, ~/.profile, $ENV.
|
|
*/
|
|
static void
|
|
read_profile(const char *name)
|
|
{
|
|
name = expandstr(name, DQSYNTAX);
|
|
if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
|
|
return;
|
|
cmdloop(0);
|
|
popfile();
|
|
}
|
|
|
|
/*
|
|
* This routine is called when an error or an interrupt occurs in an
|
|
* interactive shell and control is returned to the main command loop.
|
|
* (In dash, this function is auto-generated by build machinery).
|
|
*/
|
|
static void
|
|
reset(void)
|
|
{
|
|
/* from eval.c: */
|
|
evalskip = 0;
|
|
loopnest = 0;
|
|
|
|
/* from expand.c: */
|
|
ifsfree();
|
|
|
|
/* from input.c: */
|
|
g_parsefile->left_in_buffer = 0;
|
|
g_parsefile->left_in_line = 0; /* clear input buffer */
|
|
popallfiles();
|
|
|
|
/* from redir.c: */
|
|
unwindredir(NULL);
|
|
|
|
/* from var.c: */
|
|
unwindlocalvars(NULL);
|
|
}
|
|
|
|
#if PROFILE
|
|
static short profile_buf[16384];
|
|
extern int etext();
|
|
#endif
|
|
|
|
/*
|
|
* Main routine. We initialize things, parse the arguments, execute
|
|
* profiles if we're a login shell, and then call cmdloop to execute
|
|
* commands. The setjmp call sets up the location to jump to when an
|
|
* exception occurs. When an exception occurs the variable "state"
|
|
* is used to figure out how far we had gotten.
|
|
*/
|
|
int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
#if NUM_SCRIPTS > 0
|
|
int ash_main(int argc, char **argv)
|
|
#else
|
|
int ash_main(int argc UNUSED_PARAM, char **argv)
|
|
#endif
|
|
/* note: 'argc' is used only if embedded scripts are enabled */
|
|
{
|
|
volatile smallint state;
|
|
struct jmploc jmploc;
|
|
struct stackmark smark;
|
|
int login_sh;
|
|
|
|
/* Initialize global data */
|
|
INIT_G_misc();
|
|
INIT_G_memstack();
|
|
INIT_G_var();
|
|
#if ENABLE_ASH_ALIAS
|
|
INIT_G_alias();
|
|
#endif
|
|
INIT_G_cmdtable();
|
|
|
|
#if PROFILE
|
|
monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
|
|
#endif
|
|
|
|
state = 0;
|
|
if (setjmp(jmploc.loc)) {
|
|
smallint e;
|
|
smallint s;
|
|
|
|
reset();
|
|
|
|
e = exception_type;
|
|
s = state;
|
|
if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
|
|
exitshell();
|
|
}
|
|
if (e == EXINT) {
|
|
newline_and_flush(stderr);
|
|
}
|
|
|
|
popstackmark(&smark);
|
|
FORCE_INT_ON; /* enable interrupts */
|
|
if (s == 1)
|
|
goto state1;
|
|
if (s == 2)
|
|
goto state2;
|
|
if (s == 3)
|
|
goto state3;
|
|
goto state4;
|
|
}
|
|
exception_handler = &jmploc;
|
|
rootpid = getpid();
|
|
|
|
init();
|
|
setstackmark(&smark);
|
|
|
|
#if NUM_SCRIPTS > 0
|
|
if (argc < 0)
|
|
/* Non-NULL minusc tells procargs that an embedded script is being run */
|
|
minusc = get_script_content(-argc - 1);
|
|
#endif
|
|
login_sh = procargs(argv);
|
|
#if DEBUG
|
|
TRACE(("Shell args: "));
|
|
trace_puts_args(argv);
|
|
#endif
|
|
|
|
if (login_sh) {
|
|
const char *hp;
|
|
|
|
state = 1;
|
|
read_profile("/etc/profile");
|
|
state1:
|
|
state = 2;
|
|
hp = lookupvar("HOME");
|
|
if (hp)
|
|
read_profile("$HOME/.profile");
|
|
}
|
|
state2:
|
|
state = 3;
|
|
if (
|
|
#ifndef linux
|
|
getuid() == geteuid() && getgid() == getegid() &&
|
|
#endif
|
|
iflag
|
|
) {
|
|
const char *shinit = lookupvar("ENV");
|
|
if (shinit != NULL && *shinit != '\0')
|
|
read_profile(shinit);
|
|
}
|
|
popstackmark(&smark);
|
|
state3:
|
|
state = 4;
|
|
if (minusc) {
|
|
/* evalstring pushes parsefile stack.
|
|
* Ensure we don't falsely claim that 0 (stdin)
|
|
* is one of stacked source fds.
|
|
* Testcase: ash -c 'exec 1>&0' must not complain. */
|
|
|
|
// if (!sflag) g_parsefile->pf_fd = -1;
|
|
// ^^ not necessary since now we special-case fd 0
|
|
// in save_fd_on_redirect()
|
|
|
|
// dash: evalstring(minusc, sflag ? 0 : EV_EXIT);
|
|
// The above makes
|
|
// ash -sc 'echo $-'
|
|
// continue reading input from stdin after running 'echo'.
|
|
// bash does not do this: it prints "hBcs" and exits.
|
|
evalstring(minusc, EV_EXIT);
|
|
}
|
|
|
|
if (sflag || minusc == NULL) {
|
|
#if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
|
|
if (iflag) {
|
|
const char *hp = lookupvar("HISTFILE");
|
|
if (!hp) {
|
|
hp = lookupvar("HOME");
|
|
if (hp) {
|
|
INT_OFF;
|
|
hp = concat_path_file(hp, ".ash_history");
|
|
setvar0("HISTFILE", hp);
|
|
free((char*)hp);
|
|
INT_ON;
|
|
hp = lookupvar("HISTFILE");
|
|
}
|
|
}
|
|
if (hp)
|
|
line_input_state->hist_file = hp;
|
|
# if ENABLE_FEATURE_SH_HISTFILESIZE
|
|
hp = lookupvar("HISTFILESIZE");
|
|
line_input_state->max_history = size_from_HISTFILESIZE(hp);
|
|
# endif
|
|
}
|
|
#endif
|
|
state4: /* XXX ??? - why isn't this before the "if" statement */
|
|
cmdloop(1);
|
|
}
|
|
#if PROFILE
|
|
monitor(0);
|
|
#endif
|
|
#ifdef GPROF
|
|
{
|
|
extern void _mcleanup(void);
|
|
_mcleanup();
|
|
}
|
|
#endif
|
|
TRACE(("End of main reached\n"));
|
|
exitshell();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
/*-
|
|
* Copyright (c) 1989, 1991, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Kenneth Almquist.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|