90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini loadkmap implementation for busybox
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*
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* Copyright (C) 1998 Enrique Zanardi <ezanardi@ull.es>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include "busybox.h"
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#define BINARY_KEYMAP_MAGIC "bkeymap"
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/* From <linux/kd.h> */
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struct kbentry {
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unsigned char kb_table;
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unsigned char kb_index;
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unsigned short kb_value;
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};
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static const int KDSKBENT = 0x4B47; /* sets one entry in translation table */
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/* From <linux/keyboard.h> */
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static const int NR_KEYS = 128;
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static const int MAX_NR_KEYMAPS = 256;
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int loadkmap_main(int argc, char **argv)
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{
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struct kbentry ke;
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u_short *ibuff;
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int i, j, fd, readsz, pos, ibuffsz = NR_KEYS * sizeof(u_short);
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char flags[MAX_NR_KEYMAPS], buff[7];
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if (argc != 1)
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show_usage();
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fd = open(CURRENT_VC, O_RDWR);
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if (fd < 0)
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perror_msg_and_die("Error opening " CURRENT_VC);
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read(0, buff, 7);
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if (0 != strncmp(buff, BINARY_KEYMAP_MAGIC, 7))
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error_msg_and_die("This is not a valid binary keymap.");
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if (MAX_NR_KEYMAPS != read(0, flags, MAX_NR_KEYMAPS))
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perror_msg_and_die("Error reading keymap flags");
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ibuff = (u_short *) xmalloc(ibuffsz);
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for (i = 0; i < MAX_NR_KEYMAPS; i++) {
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if (flags[i] == 1) {
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pos = 0;
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while (pos < ibuffsz) {
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if ((readsz = read(0, (char *) ibuff + pos, ibuffsz - pos)) < 0)
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perror_msg_and_die("Error reading keymap");
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pos += readsz;
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}
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for (j = 0; j < NR_KEYS; j++) {
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ke.kb_index = j;
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ke.kb_table = i;
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ke.kb_value = ibuff[j];
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ioctl(fd, KDSKBENT, &ke);
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}
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}
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}
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/* Don't bother to close files. Exit does that
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* automagically, so we can save a few bytes */
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/* close(fd); */
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return EXIT_SUCCESS;
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}
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