console-tools/loadkmap.c

/* vi: set sw=4 ts=4: */
/*
 * Mini loadkmap implementation for busybox
 *
 * Copyright (C) 1998 Enrique Zanardi <ezanardi@ull.es>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
#include "libbb.h"

#define BINARY_KEYMAP_MAGIC "bkeymap"

/* From <linux/kd.h> */
struct kbentry {
	unsigned char kb_table;
	unsigned char kb_index;
	unsigned short kb_value;
};
/* sets one entry in translation table */
#define KDSKBENT        0x4B47

/* From <linux/keyboard.h> */
#define NR_KEYS         128
#define MAX_NR_KEYMAPS  256

int loadkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int loadkmap_main(int argc UNUSED_PARAM, char **argv)
{
	struct kbentry ke;
	int i, j, fd;
	uint16_t ibuff[NR_KEYS];
/*	const char *tty_name = CURRENT_TTY; */
	RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);

	/* When user accidentally runs "loadkmap FILE"
	 * instead of "loadkmap <FILE", we end up waiting for input from tty.
	 * Let's prevent it: */
	if (argv[1])
		bb_show_usage();
/* bb_warn_ignoring_args(argv[1]); */
	fd = get_console_fd_or_die();
/* or maybe:
	opt = getopt32(argv, "C:", &tty_name);
	fd = xopen_nonblocking(tty_name);
*/

	xread(STDIN_FILENO, flags, 7);
	if (strncmp(flags, BINARY_KEYMAP_MAGIC, 7))
		bb_error_msg_and_die("not a valid binary keymap");

	xread(STDIN_FILENO, flags, MAX_NR_KEYMAPS);

	for (i = 0; i < MAX_NR_KEYMAPS; i++) {
		if (flags[i] == 1) {
			xread(STDIN_FILENO, ibuff, NR_KEYS * sizeof(uint16_t));
			for (j = 0; j < NR_KEYS; j++) {
				ke.kb_index = j;
				ke.kb_table = i;
				ke.kb_value = ibuff[j];
				ioctl(fd, KDSKBENT, &ke);
			}
		}
	}

	if (ENABLE_FEATURE_CLEAN_UP) {
		close(fd);
		RELEASE_CONFIG_BUFFER(flags);
	}
	return EXIT_SUCCESS;
}