1 /* vi: set sw=4 ts=4: */
3 * Mini dumpkmap implementation for busybox
5 * Copyright (C) Arne Bernin <arne@matrix.loopback.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9 //config:config DUMPKMAP
10 //config: bool "dumpkmap (1.3 kb)"
12 //config: select PLATFORM_LINUX
14 //config: This program dumps the kernel's keyboard translation table to
15 //config: stdout, in binary format. You can then use loadkmap to load it.
17 //applet:IF_DUMPKMAP(APPLET_NOEXEC(dumpkmap, dumpkmap, BB_DIR_BIN, BB_SUID_DROP, dumpkmap))
18 /* bb_common_bufsiz1 usage here is safe wrt NOEXEC: not expecting it to be zeroed. */
20 //kbuild:lib-$(CONFIG_DUMPKMAP) += dumpkmap.o
22 //usage:#define dumpkmap_trivial_usage
24 //usage:#define dumpkmap_full_usage "\n\n"
25 //usage: "Print a binary keyboard translation table to stdout"
27 //usage:#define dumpkmap_example_usage
28 //usage: "$ dumpkmap > keymap\n"
31 #include "common_bufsiz.h"
33 /* From <linux/kd.h> */
35 unsigned char kb_table;
36 unsigned char kb_index;
37 unsigned short kb_value;
39 #define KDGKBENT 0x4B46 /* gets one entry in translation table */
41 /* From <linux/keyboard.h> */
43 #define MAX_NR_KEYMAPS 256
45 int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
46 int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
51 /* When user accidentally runs "dumpkmap FILE"
52 * instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
57 /* bb_warn_ignoring_args(argv[1]);*/
59 fd = get_console_fd_or_die();
61 #define flags bb_common_bufsiz1
62 setup_common_bufsiz();
63 /* 0 1 2 3 4 5 6 7 8 9 a b c=12 */
64 memcpy(flags, "bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1",
65 /* Can use sizeof, or sizeof-1. sizeof is even, using that */
66 /****/ sizeof("bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1")
68 write(STDOUT_FILENO, flags, 7 + MAX_NR_KEYMAPS);
69 #define flags7 (flags + 7)
71 for (i = 0; i < 13; i++) {
73 for (j = 0; j < NR_KEYS; j++) {
76 if (!ioctl_or_perror(fd, KDGKBENT, &ke,
77 "ioctl(KDGKBENT{%d,%d}) failed",
80 write(STDOUT_FILENO, &ke.kb_value, 2);
85 if (ENABLE_FEATURE_CLEAN_UP) {