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 tarball for details.
   8 *
   9 */
  10/* no options, no getopt */
  11
  12#include "libbb.h"
  13
  14/* From <linux/kd.h> */
  15struct kbentry {
  16        unsigned char kb_table;
  17        unsigned char kb_index;
  18        unsigned short kb_value;
  19};
  20#define KDGKBENT 0x4B46  /* gets one entry in translation table */
  21
  22/* From <linux/keyboard.h> */
  23#define NR_KEYS 128
  24#define MAX_NR_KEYMAPS 256
  25
  26int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  27int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
  28{
  29        struct kbentry ke;
  30        int i, j, fd;
  31        RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);
  32
  33        /* When user accidentally runs "dumpkmap FILE"
  34         * instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
  35         * Let's prevent it: */
  36        if (argv[1])
  37                bb_show_usage();
  38/*      bb_warn_ignoring_args(argv[1]);*/
  39
  40        fd = get_console_fd_or_die();
  41
  42        write(STDOUT_FILENO, "bkeymap", 7);
  43
  44        /* Here we want to set everything to 0 except for indexes:
  45         * [0-2] [4-6] [8-10] [12] */
  46        memset(flags, 0x00, MAX_NR_KEYMAPS);
  47        memset(flags, 0x01, 13);
  48        flags[3] = flags[7] = flags[11] = 0;
  49
  50        /* dump flags */
  51        write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);
  52
  53        for (i = 0; i < MAX_NR_KEYMAPS; i++) {
  54                if (flags[i] == 1) {
  55                        for (j = 0; j < NR_KEYS; j++) {
  56                                ke.kb_index = j;
  57                                ke.kb_table = i;
  58                                if (!ioctl_or_perror(fd, KDGKBENT, &ke,
  59                                                "ioctl failed with %s, %s, %p",
  60                                                (char *)&ke.kb_index,
  61                                                (char *)&ke.kb_table,
  62                                                &ke.kb_value)
  63                                ) {
  64                                        write(STDOUT_FILENO, (void*)&ke.kb_value, 2);
  65                                }
  66                        }
  67                }
  68        }
  69        if (ENABLE_FEATURE_CLEAN_UP) {
  70                close(fd);
  71                RELEASE_CONFIG_BUFFER(flags);
  72        }
  73        return EXIT_SUCCESS;
  74}
  75