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
11#include "libbb.h"
12
13/* From <linux/kd.h> */
14struct kbentry {
15	unsigned char kb_table;
16	unsigned char kb_index;
17	unsigned short kb_value;
18};
19#define KDGKBENT 0x4B46  /* gets one entry in translation table */
20
21/* From <linux/keyboard.h> */
22#define NR_KEYS 128
23#define MAX_NR_KEYMAPS 256
24
25int dumpkmap_main(int argc, char **argv);
26int dumpkmap_main(int argc, char **argv)
27{
28	struct kbentry ke;
29	int i, j, fd;
30	char flags[MAX_NR_KEYMAPS];
31
32	if (argc >= 2 && argv[1][0] == '-')
33		bb_show_usage();
34
35	fd = xopen(CURRENT_VC, O_RDWR);
36
37	write(1, "bkeymap", 7);
38
39	/* Here we want to set everything to 0 except for indexes:
40	 * [0-2] [4-6] [8-10] [12] */
41	memset(flags, 0x00, MAX_NR_KEYMAPS);
42	memset(flags, 0x01, 13);
43	flags[3] = flags[7] = flags[11] = 0;
44
45	/* dump flags */
46	write(1, flags, MAX_NR_KEYMAPS);
47
48	for (i = 0; i < MAX_NR_KEYMAPS; i++) {
49		if (flags[i] == 1) {
50			for (j = 0; j < NR_KEYS; j++) {
51				ke.kb_index = j;
52				ke.kb_table = i;
53				if (!ioctl_or_perror(fd, KDGKBENT, &ke,
54						"ioctl failed with %s, %s, %p",
55						(char *)&ke.kb_index,
56						(char *)&ke.kb_table,
57						&ke.kb_value)
58				) {
59					write(1, (void*)&ke.kb_value, 2);
60				}
61			}
62		}
63	}
64	close(fd);
65	return EXIT_SUCCESS;
66}
67