96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini kbd_mode implementation for busybox
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*
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* Copyright (C) 2007 Loic Grenie <loic.grenie@gmail.com>
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* written using Andries Brouwer <aeb@cwi.nl>'s kbd_mode from
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* console-utils v0.2.3, licensed under GNU GPLv2
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config KBD_MODE
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//config: bool "kbd_mode (4.1 kb)"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: This program reports and sets keyboard mode.
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//applet:IF_KBD_MODE(APPLET_NOEXEC(kbd_mode, kbd_mode, BB_DIR_BIN, BB_SUID_DROP, kbd_mode))
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//kbuild:lib-$(CONFIG_KBD_MODE) += kbd_mode.o
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//usage:#define kbd_mode_trivial_usage
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//usage: "[-a|k|s|u] [-C TTY]"
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//usage:#define kbd_mode_full_usage "\n\n"
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//usage: "Report or set VT console keyboard mode\n"
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//usage: "\n -a Default (ASCII)"
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//usage: "\n -k Medium-raw (keycode)"
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//usage: "\n -s Raw (scancode)"
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//usage: "\n -u Unicode (utf-8)"
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//usage: "\n -C TTY Affect TTY"
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#include "libbb.h"
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#include <linux/kd.h>
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int kbd_mode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int kbd_mode_main(int argc UNUSED_PARAM, char **argv)
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{
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enum {
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SCANCODE = (1 << 0),
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ASCII = (1 << 1),
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MEDIUMRAW = (1 << 2),
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UNICODE = (1 << 3),
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};
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int fd;
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unsigned opt;
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const char *tty_name;
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opt = getopt32(argv, "sakuC:", &tty_name);
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if (opt & 0x10) {
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opt &= 0xf; /* clear -C bit, see (*) */
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fd = xopen_nonblocking(tty_name);
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} else {
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/* kbd-2.0.3 tries in sequence:
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* fd#0, /dev/tty, /dev/tty0.
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* get_console_fd_or_die: /dev/console, /dev/tty0, /dev/tty.
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* kbd-2.0.3 checks KDGKBTYPE, get_console_fd_or_die checks too.
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*/
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fd = get_console_fd_or_die();
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}
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if (!opt) { /* print current setting */
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const char *mode = "unknown";
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int m;
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xioctl(fd, KDGKBMODE, &m);
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if (m == K_RAW)
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mode = "raw (scancode)";
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else if (m == K_XLATE)
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mode = "default (ASCII)";
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else if (m == K_MEDIUMRAW)
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mode = "mediumraw (keycode)";
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else if (m == K_UNICODE)
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mode = "Unicode (UTF-8)";
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else if (m == 4 /*K_OFF*/) /* kbd-2.0.3 does not show this mode, says "unknown" */
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mode = "off";
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printf("The keyboard is in %s mode\n", mode);
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} else {
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/* here we depend on specific bits assigned to options (*)
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* KDSKBMODE constants have these values:
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* #define K_RAW 0x00
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* #define K_XLATE 0x01
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* #define K_MEDIUMRAW 0x02
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* #define K_UNICODE 0x03
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* #define K_OFF 0x04
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* (looks like "-ak" together would cause the same effect as -u)
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*/
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opt = opt & UNICODE ? 3 : opt >> 1;
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/* double cast prevents warnings about widening conversion */
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xioctl(fd, KDSKBMODE, (void*)(ptrdiff_t)opt);
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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close(fd);
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return EXIT_SUCCESS;
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}
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