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