| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 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 | 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 | } |