LXR 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> */
  23struct 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
  34int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  35int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
  36{
  37        struct kbentry ke;
  38        int i, j, fd;
  39        RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);
  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        if (argv[1])
  45                bb_show_usage();
  46/*      bb_warn_ignoring_args(argv[1]);*/
  47
  48        fd = get_console_fd_or_die();
  49
  50        write(STDOUT_FILENO, "bkeymap", 7);
  51
  52        /* Here we want to set everything to 0 except for indexes:
  53         * [0-2] [4-6] [8-10] [12] */
  54        memset(flags, 0x00, MAX_NR_KEYMAPS);
  55        memset(flags, 0x01, 13);
  56        flags[3] = flags[7] = flags[11] = 0;
  57
  58        /* dump flags */
  59        write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);
  60
  61        for (i = 0; i < MAX_NR_KEYMAPS; i++) {
  62                if (flags[i] == 1) {
  63                        for (j = 0; j < NR_KEYS; j++) {
  64                                ke.kb_index = j;
  65                                ke.kb_table = i;
  66                                if (!ioctl_or_perror(fd, KDGKBENT, &ke,
  67                                                "ioctl failed with %s, %s, %p",
  68                                                (char *)&ke.kb_index,
  69                                                (char *)&ke.kb_table,
  70                                                &ke.kb_value)
  71                                ) {
  72                                        write(STDOUT_FILENO, (void*)&ke.kb_value, 2);
  73                                }
  74                        }
  75                }
  76        }
  77        if (ENABLE_FEATURE_CLEAN_UP) {
  78                close(fd);
  79                RELEASE_CONFIG_BUFFER(flags);
  80        }
  81        return EXIT_SUCCESS;
  82}
  83