release/src/router/busybox/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
  22 /* From <linux/kd.h> */
  23 struct kbentry {
  24         unsigned char kb_table;
  25         unsigned char kb_index;
  26         unsigned short kb_value;
  27 };
  28 #define KDGKBENT 0x4B46  /* gets one entry in translation table */
  29
  30 /* From <linux/keyboard.h> */
  31 #define NR_KEYS 128
  32 #define MAX_NR_KEYMAPS 256
  33
  34 int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  35 int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
  36 {
  37         struct kbentry ke;
  38         int i, j, fd;
  39 #define flags bb_common_bufsiz1
  40
  41         /* When user accidentally runs "dumpkmap FILE"
  42          * instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
  43          * Let's prevent it:
  44          */
  45         if (argv[1])
  46                 bb_show_usage();
  47 /*      bb_warn_ignoring_args(argv[1]);*/
  48
  49         fd = get_console_fd_or_die();
  50
  51 #if 0
  52         write(STDOUT_FILENO, "bkeymap", 7);
  53         /* Here we want to set everything to 0 except for indexes:
  54          * [0-2] [4-6] [8-10] [12]
  55          */
  56         /*memset(flags, 0x00, MAX_NR_KEYMAPS); - already is */
  57         memset(flags, 0x01, 13);
  58         flags[3] = flags[7] = flags[11] = 0;
  59         /* dump flags */
  60         write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);
  61 #define flags7 flags
  62 #else
  63         /* Same effect */
  64         /*                     0 1 2 3 4 5 6 7 8 9 a b c=12 */
  65         memcpy(flags, "bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1",
  66         /* Can use sizeof, or sizeof-1. sizeof is even, using that */
  67         /****/ sizeof("bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1")
  68         );
  69         write(STDOUT_FILENO, flags, 7 + MAX_NR_KEYMAPS);
  70 #define flags7 (flags + 7)
  71 #endif
  72
  73         for (i = 0; i < 13; i++) {
  74                 if (flags7[i]) {
  75                         for (j = 0; j < NR_KEYS; j++) {
  76                                 ke.kb_index = j;
  77                                 ke.kb_table = i;
  78                                 if (!ioctl_or_perror(fd, KDGKBENT, &ke,
  79                                                 "ioctl(KDGKBENT{%d,%d}) failed",
  80                                                 j, i)
  81                                 ) {
  82                                         write(STDOUT_FILENO, &ke.kb_value, 2);
  83                                 }
  84                         }
  85                 }
  86         }
  87         if (ENABLE_FEATURE_CLEAN_UP) {
  88                 close(fd);
  89         }
  90         return EXIT_SUCCESS;
  91 }