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Eric Andersen61dc0572000-07-11 17:29:36 +00001/* vi: set sw=4 ts=4: */
2/*
3 * Mini dumpkmap implementation for busybox
4 *
5 * Copyright (C) Arne Bernin <arne@matrix.loopback.org>
6 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02007 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
Eric Andersen61dc0572000-07-11 17:29:36 +00008 *
9 */
Denys Vlasenko6d932992016-11-23 10:39:27 +010010//config:config DUMPKMAP
Denys Vlasenko4eed2c62017-07-18 22:01:24 +020011//config: bool "dumpkmap (1.3 kb)"
Denys Vlasenko6d932992016-11-23 10:39:27 +010012//config: default y
13//config: select PLATFORM_LINUX
14//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +020015//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.
Denys Vlasenko6d932992016-11-23 10:39:27 +010017
18//applet:IF_DUMPKMAP(APPLET(dumpkmap, BB_DIR_BIN, BB_SUID_DROP))
19
20//kbuild:lib-$(CONFIG_DUMPKMAP) += dumpkmap.o
Eric Andersen61dc0572000-07-11 17:29:36 +000021
Pere Orga55068c42011-03-27 23:42:28 +020022//usage:#define dumpkmap_trivial_usage
23//usage: "> keymap"
24//usage:#define dumpkmap_full_usage "\n\n"
25//usage: "Print a binary keyboard translation table to stdout"
26//usage:
27//usage:#define dumpkmap_example_usage
28//usage: "$ dumpkmap > keymap\n"
29
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000030#include "libbb.h"
Denys Vlasenkoe6a2f4c2016-04-21 16:26:30 +020031#include "common_bufsiz.h"
Eric Andersen61dc0572000-07-11 17:29:36 +000032
33/* From <linux/kd.h> */
34struct kbentry {
35 unsigned char kb_table;
36 unsigned char kb_index;
37 unsigned short kb_value;
38};
Mike Frysinger7e64db22005-07-31 22:09:33 +000039#define KDGKBENT 0x4B46 /* gets one entry in translation table */
Eric Andersen61dc0572000-07-11 17:29:36 +000040
41/* From <linux/keyboard.h> */
Mike Frysinger7e64db22005-07-31 22:09:33 +000042#define NR_KEYS 128
43#define MAX_NR_KEYMAPS 256
Eric Andersen61dc0572000-07-11 17:29:36 +000044
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000045int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denys Vlasenko2fd45c22010-06-06 18:09:57 +020046int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
Eric Andersen61dc0572000-07-11 17:29:36 +000047{
48 struct kbentry ke;
49 int i, j, fd;
Denys Vlasenko32ed30d2013-09-17 14:16:25 +020050#define flags bb_common_bufsiz1
Denys Vlasenko9de2e5a2016-04-21 18:38:51 +020051 setup_common_bufsiz();
Eric Andersen61dc0572000-07-11 17:29:36 +000052
Denys Vlasenko2fd45c22010-06-06 18:09:57 +020053 /* When user accidentally runs "dumpkmap FILE"
54 * instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
Denys Vlasenko32ed30d2013-09-17 14:16:25 +020055 * Let's prevent it:
56 */
Denys Vlasenko2fd45c22010-06-06 18:09:57 +020057 if (argv[1])
58 bb_show_usage();
Denys Vlasenkoa355da02010-01-04 13:16:08 +010059/* bb_warn_ignoring_args(argv[1]);*/
Eric Andersen61dc0572000-07-11 17:29:36 +000060
Denis Vlasenko2afd5ab2008-08-05 23:32:27 +000061 fd = get_console_fd_or_die();
Eric Andersen61dc0572000-07-11 17:29:36 +000062
Denys Vlasenko32ed30d2013-09-17 14:16:25 +020063#if 0
Bernhard Reutner-Fischerae4342c2008-05-19 08:18:50 +000064 write(STDOUT_FILENO, "bkeymap", 7);
Mike Frysingere11ff712005-07-31 22:06:38 +000065 /* Here we want to set everything to 0 except for indexes:
Denys Vlasenko32ed30d2013-09-17 14:16:25 +020066 * [0-2] [4-6] [8-10] [12]
67 */
68 /*memset(flags, 0x00, MAX_NR_KEYMAPS); - already is */
Mike Frysingere11ff712005-07-31 22:06:38 +000069 memset(flags, 0x01, 13);
70 flags[3] = flags[7] = flags[11] = 0;
Eric Andersen61dc0572000-07-11 17:29:36 +000071 /* dump flags */
Bernhard Reutner-Fischerae4342c2008-05-19 08:18:50 +000072 write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);
Denys Vlasenko32ed30d2013-09-17 14:16:25 +020073#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
Eric Andersen61dc0572000-07-11 17:29:36 +000084
Denys Vlasenko32ed30d2013-09-17 14:16:25 +020085 for (i = 0; i < 13; i++) {
86 if (flags7[i]) {
Eric Andersen61dc0572000-07-11 17:29:36 +000087 for (j = 0; j < NR_KEYS; j++) {
88 ke.kb_index = j;
89 ke.kb_table = i;
Denis Vlasenkofb79a2e2007-07-14 22:07:14 +000090 if (!ioctl_or_perror(fd, KDGKBENT, &ke,
Denys Vlasenko32ed30d2013-09-17 14:16:25 +020091 "ioctl(KDGKBENT{%d,%d}) failed",
92 j, i)
Denis Vlasenkofb79a2e2007-07-14 22:07:14 +000093 ) {
Denys Vlasenko32ed30d2013-09-17 14:16:25 +020094 write(STDOUT_FILENO, &ke.kb_value, 2);
Mike Frysingerf28c7ec2005-07-30 09:24:49 +000095 }
Eric Andersen61dc0572000-07-11 17:29:36 +000096 }
97 }
98 }
Bernhard Reutner-Fischerae4342c2008-05-19 08:18:50 +000099 if (ENABLE_FEATURE_CLEAN_UP) {
100 close(fd);
Bernhard Reutner-Fischerae4342c2008-05-19 08:18:50 +0000101 }
Matt Kraai3e856ce2000-12-01 02:55:13 +0000102 return EXIT_SUCCESS;
Eric Andersen61dc0572000-07-11 17:29:36 +0000103}