69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/* printenv -- minimal clone of BSD printenv(1).
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usage: printenv [varname]
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Chet Ramey
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chet@po.cwru.edu
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*/
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/* Copyright (C) 1997-2002 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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extern char **environ;
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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register char **envp, *eval;
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int len;
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argv++;
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argc--;
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/* printenv */
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if (argc == 0)
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{
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for (envp = environ; *envp; envp++)
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puts (*envp);
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exit(EXIT_SUCCESS);
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}
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/* printenv varname */
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len = strlen (*argv);
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for (envp = environ; *envp; envp++)
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{
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if (**argv == **envp && strncmp (*envp, *argv, len) == 0)
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{
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eval = *envp + len;
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/* If the environment variable doesn't have an '=', ignore it. */
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if (*eval == '=')
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{
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puts (eval + 1);
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exit(EXIT_SUCCESS);
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}
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}
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}
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exit(EXIT_FAILURE);
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}
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