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 tarball for details.
8 *
9 */
10/* no options, no getopt */
11
12#include "libbb.h"
13
14/* From <linux/kd.h> */
15struct kbentry {
16	unsigned char kb_table;
17	unsigned char kb_index;
18	unsigned short kb_value;
19};
20#define KDGKBENT 0x4B46  /* gets one entry in translation table */
21
22/* From <linux/keyboard.h> */
23#define NR_KEYS 128
24#define MAX_NR_KEYMAPS 256
25
26int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
27int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
28{
29	struct kbentry ke;
30	int i, j, fd;
31	RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);
32
33	/* When user accidentally runs "dumpkmap FILE"
34	 * instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
35	 * Let's prevent it: */
36	if (argv[1])
37		bb_show_usage();
38/*	bb_warn_ignoring_args(argv[1]);*/
39
40	fd = get_console_fd_or_die();
41
42	write(STDOUT_FILENO, "bkeymap", 7);
43
44	/* Here we want to set everything to 0 except for indexes:
45	 * [0-2] [4-6] [8-10] [12] */
46	memset(flags, 0x00, MAX_NR_KEYMAPS);
47	memset(flags, 0x01, 13);
48	flags[3] = flags[7] = flags[11] = 0;
49
50	/* dump flags */
51	write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);
52
53	for (i = 0; i < MAX_NR_KEYMAPS; i++) {
54		if (flags[i] == 1) {
55			for (j = 0; j < NR_KEYS; j++) {
56				ke.kb_index = j;
57				ke.kb_table = i;
58				if (!ioctl_or_perror(fd, KDGKBENT, &ke,
59						"ioctl failed with %s, %s, %p",
60						(char *)&ke.kb_index,
61						(char *)&ke.kb_table,
62						&ke.kb_value)
63				) {
64					write(STDOUT_FILENO, (void*)&ke.kb_value, 2);
65				}
66			}
67		}
68	}
69	if (ENABLE_FEATURE_CLEAN_UP) {
70		close(fd);
71		RELEASE_CONFIG_BUFFER(flags);
72	}
73	return EXIT_SUCCESS;
74}
75