release/src/router/busybox/console-tools/kbd_mode.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini kbd_mode implementation for busybox
   4  *
   5  * Copyright (C) 2007 Loic Grenie <loic.grenie@gmail.com>
   6  *   written using Andries Brouwer <aeb@cwi.nl>'s kbd_mode from
   7  *   console-utils v0.2.3, licensed under GNU GPLv2
   8  *
   9  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  10  */
  11
  12 //usage:#define kbd_mode_trivial_usage
  13 //usage:       "[-a|k|s|u] [-C TTY]"
  14 //usage:#define kbd_mode_full_usage "\n\n"
  15 //usage:       "Report or set the keyboard mode\n"
  16 //usage:     "\n        -a      Default (ASCII)"
  17 //usage:     "\n        -k      Medium-raw (keyboard)"
  18 //usage:     "\n        -s      Raw (scancode)"
  19 //usage:     "\n        -u      Unicode (utf-8)"
  20 //usage:     "\n        -C TTY  Affect TTY instead of /dev/tty"
  21
  22 #include "libbb.h"
  23 #include <linux/kd.h>
  24
  25 int kbd_mode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  26 int kbd_mode_main(int argc UNUSED_PARAM, char **argv)
  27 {
  28         enum {
  29                 SCANCODE  = (1 << 0),
  30                 ASCII     = (1 << 1),
  31                 MEDIUMRAW = (1 << 2),
  32                 UNICODE   = (1 << 3),
  33         };
  34         int fd;
  35         unsigned opt;
  36         const char *tty_name = CURRENT_TTY;
  37
  38         opt = getopt32(argv, "sakuC:", &tty_name);
  39         fd = xopen_nonblocking(tty_name);
  40         opt &= 0xf; /* clear -C bit, see (*) */
  41
  42         if (!opt) { /* print current setting */
  43                 const char *mode = "unknown";
  44                 int m;
  45
  46                 xioctl(fd, KDGKBMODE, &m);
  47                 if (m == K_RAW)
  48                         mode = "raw (scancode)";
  49                 else if (m == K_XLATE)
  50                         mode = "default (ASCII)";
  51                 else if (m == K_MEDIUMRAW)
  52                         mode = "mediumraw (keycode)";
  53                 else if (m == K_UNICODE)
  54                         mode = "Unicode (UTF-8)";
  55                 printf("The keyboard is in %s mode\n", mode);
  56         } else {
  57                 /* here we depend on specific bits assigned to options (*) */
  58                 opt = opt & UNICODE ? 3 : opt >> 1;
  59                 /* double cast prevents warnings about widening conversion */
  60                 xioctl(fd, KDSKBMODE, (void*)(ptrdiff_t)opt);
  61         }
  62
  63         if (ENABLE_FEATURE_CLEAN_UP)
  64                 close(fd);
  65         return EXIT_SUCCESS;
  66 }