console-tools/loadkmap.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini loadkmap implementation for busybox
   4  *
   5  * Copyright (C) 1998 Enrique Zanardi <ezanardi@ull.es>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9
  10 //usage:#define loadkmap_trivial_usage
  11 //usage:       "< keymap"
  12 //usage:#define loadkmap_full_usage "\n\n"
  13 //usage:       "Load a binary keyboard translation table from stdin"
  14 ////usage:       "\n"
  15 ////usage:       "\n    -C TTY  Affect TTY instead of /dev/tty"
  16 //usage:
  17 //usage:#define loadkmap_example_usage
  18 //usage:       "$ loadkmap < /etc/i18n/lang-keymap\n"
  19
  20 #include "libbb.h"
  21
  22 #define BINARY_KEYMAP_MAGIC "bkeymap"
  23
  24 /* From <linux/kd.h> */
  25 struct kbentry {
  26         unsigned char kb_table;
  27         unsigned char kb_index;
  28         unsigned short kb_value;
  29 };
  30 /* sets one entry in translation table */
  31 #define KDSKBENT        0x4B47
  32
  33 /* From <linux/keyboard.h> */
  34 #define NR_KEYS         128
  35 #define MAX_NR_KEYMAPS  256
  36
  37 int loadkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  38 int loadkmap_main(int argc UNUSED_PARAM, char **argv)
  39 {
  40         struct kbentry ke;
  41         int i, j, fd;
  42         uint16_t ibuff[NR_KEYS];
  43 /*      const char *tty_name = CURRENT_TTY; */
  44         RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);
  45
  46         /* When user accidentally runs "loadkmap FILE"
  47          * instead of "loadkmap <FILE", we end up waiting for input from tty.
  48          * Let's prevent it: */
  49         if (argv[1])
  50                 bb_show_usage();
  51 /* bb_warn_ignoring_args(argv[1]); */
  52
  53         fd = get_console_fd_or_die();
  54 /* or maybe:
  55         opt = getopt32(argv, "C:", &tty_name);
  56         fd = xopen_nonblocking(tty_name);
  57 */
  58
  59         xread(STDIN_FILENO, flags, 7);
  60         if (!is_prefixed_with(flags, BINARY_KEYMAP_MAGIC))
  61                 bb_error_msg_and_die("not a valid binary keymap");
  62
  63         xread(STDIN_FILENO, flags, MAX_NR_KEYMAPS);
  64
  65         for (i = 0; i < MAX_NR_KEYMAPS; i++) {
  66                 if (flags[i] != 1)
  67                         continue;
  68                 xread(STDIN_FILENO, ibuff, NR_KEYS * sizeof(uint16_t));
  69                 for (j = 0; j < NR_KEYS; j++) {
  70                         ke.kb_index = j;
  71                         ke.kb_table = i;
  72                         ke.kb_value = ibuff[j];
  73                         /*
  74                          * Note: table[idx:0] can contain special value
  75                          * K_ALLOCATED (marks allocated tables in kernel).
  76                          * dumpkmap saves the value as-is; but attempts
  77                          * to load it here fail, since it isn't a valid
  78                          * key value: it is K(KT_SPEC,126) == 2<<8 + 126,
  79                          * whereas last valid KT_SPEC is
  80                          * K_BARENUMLOCK == K(KT_SPEC,19).
  81                          * So far we just ignore these errors:
  82                          */
  83                         ioctl(fd, KDSKBENT, &ke);
  84                 }
  85         }
  86
  87         if (ENABLE_FEATURE_CLEAN_UP) {
  88                 close(fd);
  89                 RELEASE_CONFIG_BUFFER(flags);
  90         }
  91         return EXIT_SUCCESS;
  92 }