1/* vi: set sw=4 ts=4: */
2/*
3 * Mini loadkmap implementation for busybox
4 *
5 * Copyright (C) 1998 Enrique Zanardi <ezanardi@ull.es>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#include <errno.h>
24#include <fcntl.h>
25#include <stdio.h>
26#include <string.h>
27#include <stdlib.h>
28#include <unistd.h>
29#include <sys/ioctl.h>
30#include "busybox.h"
31
32#define BINARY_KEYMAP_MAGIC "bkeymap"
33
34/* From <linux/kd.h> */
35struct kbentry {
36	unsigned char kb_table;
37	unsigned char kb_index;
38	unsigned short kb_value;
39};
40static const int KDSKBENT = 0x4B47;  /* sets one entry in translation table */
41
42/* From <linux/keyboard.h> */
43static const int NR_KEYS = 128;
44static const int MAX_NR_KEYMAPS = 256;
45
46int loadkmap_main(int argc, char **argv)
47{
48	struct kbentry ke;
49	u_short *ibuff;
50	int i, j, fd, readsz, pos, ibuffsz = NR_KEYS * sizeof(u_short);
51	char flags[MAX_NR_KEYMAPS], buff[7];
52
53	if (argc != 1)
54		show_usage();
55
56	fd = open(CURRENT_VC, O_RDWR);
57	if (fd < 0)
58		perror_msg_and_die("Error opening " CURRENT_VC);
59
60	read(0, buff, 7);
61	if (0 != strncmp(buff, BINARY_KEYMAP_MAGIC, 7))
62		error_msg_and_die("This is not a valid binary keymap.");
63
64	if (MAX_NR_KEYMAPS != read(0, flags, MAX_NR_KEYMAPS))
65		perror_msg_and_die("Error reading keymap flags");
66
67	ibuff = (u_short *) xmalloc(ibuffsz);
68
69	for (i = 0; i < MAX_NR_KEYMAPS; i++) {
70		if (flags[i] == 1) {
71			pos = 0;
72			while (pos < ibuffsz) {
73				if ((readsz = read(0, (char *) ibuff + pos, ibuffsz - pos)) < 0)
74					perror_msg_and_die("Error reading keymap");
75				pos += readsz;
76			}
77			for (j = 0; j < NR_KEYS; j++) {
78				ke.kb_index = j;
79				ke.kb_table = i;
80				ke.kb_value = ibuff[j];
81				ioctl(fd, KDSKBENT, &ke);
82			}
83		}
84	}
85	/* Don't bother to close files.  Exit does that
86	 * automagically, so we can save a few bytes */
87	/* close(fd); */
88	return EXIT_SUCCESS;
89}
90