console-tools/dumpkmap.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini dumpkmap implementation for busybox
   4  *
   5  * Copyright (C) Arne Bernin <arne@matrix.loopback.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  *
   9  */
  10 /* no options, no getopt */
  11
  12 //usage:#define dumpkmap_trivial_usage
  13 //usage:       "> keymap"
  14 //usage:#define dumpkmap_full_usage "\n\n"
  15 //usage:       "Print a binary keyboard translation table to stdout"
  16 //usage:
  17 //usage:#define dumpkmap_example_usage
  18 //usage:       "$ dumpkmap > keymap\n"
  19
  20 #include "libbb.h"
  21 #include "common_bufsiz.h"
  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 #define KDGKBENT 0x4B46  /* gets one entry in translation table */
  30
  31 /* From <linux/keyboard.h> */
  32 #define NR_KEYS 128
  33 #define MAX_NR_KEYMAPS 256
  34
  35 int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  36 int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
  37 {
  38         struct kbentry ke;
  39         int i, j, fd;
  40 #define flags bb_common_bufsiz1
  41         setup_common_bufsiz();
  42
  43         /* When user accidentally runs "dumpkmap FILE"
  44          * instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
  45          * Let's prevent it:
  46          */
  47         if (argv[1])
  48                 bb_show_usage();
  49 /*      bb_warn_ignoring_args(argv[1]);*/
  50
  51         fd = get_console_fd_or_die();
  52
  53 #if 0
  54         write(STDOUT_FILENO, "bkeymap", 7);
  55         /* Here we want to set everything to 0 except for indexes:
  56          * [0-2] [4-6] [8-10] [12]
  57          */
  58         /*memset(flags, 0x00, MAX_NR_KEYMAPS); - already is */
  59         memset(flags, 0x01, 13);
  60         flags[3] = flags[7] = flags[11] = 0;
  61         /* dump flags */
  62         write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);
  63 #define flags7 flags
  64 #else
  65         /* Same effect */
  66         /*                     0 1 2 3 4 5 6 7 8 9 a b c=12 */
  67         memcpy(flags, "bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1",
  68         /* Can use sizeof, or sizeof-1. sizeof is even, using that */
  69         /****/ sizeof("bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1")
  70         );
  71         write(STDOUT_FILENO, flags, 7 + MAX_NR_KEYMAPS);
  72 #define flags7 (flags + 7)
  73 #endif
  74
  75         for (i = 0; i < 13; i++) {
  76                 if (flags7[i]) {
  77                         for (j = 0; j < NR_KEYS; j++) {
  78                                 ke.kb_index = j;
  79                                 ke.kb_table = i;
  80                                 if (!ioctl_or_perror(fd, KDGKBENT, &ke,
  81                                                 "ioctl(KDGKBENT{%d,%d}) failed",
  82                                                 j, i)
  83                                 ) {
  84                                         write(STDOUT_FILENO, &ke.kb_value, 2);
  85                                 }
  86                         }
  87                 }
  88         }
  89         if (ENABLE_FEATURE_CLEAN_UP) {
  90                 close(fd);
  91         }
  92         return EXIT_SUCCESS;
  93 }