blob: 4a249868a12d2cb0ad586024aef6aecde29714a9
| 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 | //config:config DUMPKMAP |
| 11 | //config: bool "dumpkmap" |
| 12 | //config: default y |
| 13 | //config: select PLATFORM_LINUX |
| 14 | //config: help |
| 15 | //config: This program dumps the kernel's keyboard translation table to |
| 16 | //config: stdout, in binary format. You can then use loadkmap to load it. |
| 17 | |
| 18 | //applet:IF_DUMPKMAP(APPLET(dumpkmap, BB_DIR_BIN, BB_SUID_DROP)) |
| 19 | |
| 20 | //kbuild:lib-$(CONFIG_DUMPKMAP) += dumpkmap.o |
| 21 | |
| 22 | //usage:#define dumpkmap_trivial_usage |
| 23 | //usage: "> keymap" |
| 24 | //usage:#define dumpkmap_full_usage "\n\n" |
| 25 | //usage: "Print a binary keyboard translation table to stdout" |
| 26 | //usage: |
| 27 | //usage:#define dumpkmap_example_usage |
| 28 | //usage: "$ dumpkmap > keymap\n" |
| 29 | |
| 30 | #include "libbb.h" |
| 31 | #include "common_bufsiz.h" |
| 32 | |
| 33 | /* From <linux/kd.h> */ |
| 34 | struct kbentry { |
| 35 | unsigned char kb_table; |
| 36 | unsigned char kb_index; |
| 37 | unsigned short kb_value; |
| 38 | }; |
| 39 | #define KDGKBENT 0x4B46 /* gets one entry in translation table */ |
| 40 | |
| 41 | /* From <linux/keyboard.h> */ |
| 42 | #define NR_KEYS 128 |
| 43 | #define MAX_NR_KEYMAPS 256 |
| 44 | |
| 45 | int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 46 | int dumpkmap_main(int argc UNUSED_PARAM, char **argv) |
| 47 | { |
| 48 | struct kbentry ke; |
| 49 | int i, j, fd; |
| 50 | #define flags bb_common_bufsiz1 |
| 51 | setup_common_bufsiz(); |
| 52 | |
| 53 | /* When user accidentally runs "dumpkmap FILE" |
| 54 | * instead of "dumpkmap >FILE", we'd dump binary stuff to tty. |
| 55 | * Let's prevent it: |
| 56 | */ |
| 57 | if (argv[1]) |
| 58 | bb_show_usage(); |
| 59 | /* bb_warn_ignoring_args(argv[1]);*/ |
| 60 | |
| 61 | fd = get_console_fd_or_die(); |
| 62 | |
| 63 | #if 0 |
| 64 | write(STDOUT_FILENO, "bkeymap", 7); |
| 65 | /* Here we want to set everything to 0 except for indexes: |
| 66 | * [0-2] [4-6] [8-10] [12] |
| 67 | */ |
| 68 | /*memset(flags, 0x00, MAX_NR_KEYMAPS); - already is */ |
| 69 | memset(flags, 0x01, 13); |
| 70 | flags[3] = flags[7] = flags[11] = 0; |
| 71 | /* dump flags */ |
| 72 | write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS); |
| 73 | #define flags7 flags |
| 74 | #else |
| 75 | /* Same effect */ |
| 76 | /* 0 1 2 3 4 5 6 7 8 9 a b c=12 */ |
| 77 | memcpy(flags, "bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1", |
| 78 | /* Can use sizeof, or sizeof-1. sizeof is even, using that */ |
| 79 | /****/ sizeof("bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1") |
| 80 | ); |
| 81 | write(STDOUT_FILENO, flags, 7 + MAX_NR_KEYMAPS); |
| 82 | #define flags7 (flags + 7) |
| 83 | #endif |
| 84 | |
| 85 | for (i = 0; i < 13; i++) { |
| 86 | if (flags7[i]) { |
| 87 | for (j = 0; j < NR_KEYS; j++) { |
| 88 | ke.kb_index = j; |
| 89 | ke.kb_table = i; |
| 90 | if (!ioctl_or_perror(fd, KDGKBENT, &ke, |
| 91 | "ioctl(KDGKBENT{%d,%d}) failed", |
| 92 | j, i) |
| 93 | ) { |
| 94 | write(STDOUT_FILENO, &ke.kb_value, 2); |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | } |
| 99 | if (ENABLE_FEATURE_CLEAN_UP) { |
| 100 | close(fd); |
| 101 | } |
| 102 | return EXIT_SUCCESS; |
| 103 | } |
| 104 |