| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini dumpkmap implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) Arne Bernin <arne@matrix.loopback.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | *
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| 9 | */
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| 10 | /* no options, no getopt */
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| 11 |
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| 12 | //usage:#define dumpkmap_trivial_usage
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| 13 | //usage: "> keymap"
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| 14 | //usage:#define dumpkmap_full_usage "\n\n"
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| 15 | //usage: "Print a binary keyboard translation table to stdout"
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| 16 | //usage:
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| 17 | //usage:#define dumpkmap_example_usage
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| 18 | //usage: "$ dumpkmap > keymap\n"
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| 19 |
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| 20 | #include "libbb.h"
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| 21 |
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| 22 | /* From <linux/kd.h> */
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| 23 | struct kbentry {
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| 24 | unsigned char kb_table;
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| 25 | unsigned char kb_index;
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| 26 | unsigned short kb_value;
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| 27 | };
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| 28 | #define KDGKBENT 0x4B46 /* gets one entry in translation table */
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| 29 |
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| 30 | /* From <linux/keyboard.h> */
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| 31 | #define NR_KEYS 128
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| 32 | #define MAX_NR_KEYMAPS 256
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| 33 |
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| 34 | int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 35 | int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
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| 36 | {
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| 37 | struct kbentry ke;
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| 38 | int i, j, fd;
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| 39 | RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);
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| 40 |
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| 41 | /* When user accidentally runs "dumpkmap FILE"
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| 42 | * instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
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| 43 | * Let's prevent it: */
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| 44 | if (argv[1])
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| 45 | bb_show_usage();
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| 46 | /* bb_warn_ignoring_args(argv[1]);*/
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| 47 |
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| 48 | fd = get_console_fd_or_die();
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| 49 |
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| 50 | write(STDOUT_FILENO, "bkeymap", 7);
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| 51 |
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| 52 | /* Here we want to set everything to 0 except for indexes:
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| 53 | * [0-2] [4-6] [8-10] [12] */
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| 54 | memset(flags, 0x00, MAX_NR_KEYMAPS);
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| 55 | memset(flags, 0x01, 13);
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| 56 | flags[3] = flags[7] = flags[11] = 0;
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| 57 |
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| 58 | /* dump flags */
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| 59 | write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);
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| 60 |
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| 61 | for (i = 0; i < MAX_NR_KEYMAPS; i++) {
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| 62 | if (flags[i] == 1) {
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| 63 | for (j = 0; j < NR_KEYS; j++) {
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| 64 | ke.kb_index = j;
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| 65 | ke.kb_table = i;
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| 66 | if (!ioctl_or_perror(fd, KDGKBENT, &ke,
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| 67 | "ioctl failed with %s, %s, %p",
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| 68 | (char *)&ke.kb_index,
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| 69 | (char *)&ke.kb_table,
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| 70 | &ke.kb_value)
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| 71 | ) {
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| 72 | write(STDOUT_FILENO, (void*)&ke.kb_value, 2);
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| 73 | }
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| 74 | }
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| 75 | }
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| 76 | }
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| 77 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 78 | close(fd);
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| 79 | RELEASE_CONFIG_BUFFER(flags);
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| 80 | }
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| 81 | return EXIT_SUCCESS;
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| 82 | }
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