90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini dumpkmap implementation for busybox
|
|
*
|
|
* Copyright (C) Arne Bernin <arne@matrix.loopback.org>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
//config:config DUMPKMAP
|
|
//config: bool "dumpkmap (1.6 kb)"
|
|
//config: default y
|
|
//config: select PLATFORM_LINUX
|
|
//config: help
|
|
//config: This program dumps the kernel's keyboard translation table to
|
|
//config: stdout, in binary format. You can then use loadkmap to load it.
|
|
|
|
//applet:IF_DUMPKMAP(APPLET_NOEXEC(dumpkmap, dumpkmap, BB_DIR_BIN, BB_SUID_DROP, dumpkmap))
|
|
/* bb_common_bufsiz1 usage here is safe wrt NOEXEC: not expecting it to be zeroed. */
|
|
|
|
//kbuild:lib-$(CONFIG_DUMPKMAP) += dumpkmap.o
|
|
|
|
//usage:#define dumpkmap_trivial_usage
|
|
//usage: "> keymap"
|
|
//usage:#define dumpkmap_full_usage "\n\n"
|
|
//usage: "Print a binary keyboard translation table to stdout"
|
|
//usage:
|
|
//usage:#define dumpkmap_example_usage
|
|
//usage: "$ dumpkmap > keymap\n"
|
|
|
|
#include "libbb.h"
|
|
#include "common_bufsiz.h"
|
|
|
|
/* From <linux/kd.h> */
|
|
struct kbentry {
|
|
unsigned char kb_table;
|
|
unsigned char kb_index;
|
|
unsigned short kb_value;
|
|
};
|
|
#define KDGKBENT 0x4B46 /* gets one entry in translation table */
|
|
|
|
/* From <linux/keyboard.h> */
|
|
#define NR_KEYS 128
|
|
#define MAX_NR_KEYMAPS 256
|
|
|
|
int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct kbentry ke;
|
|
int i, j, fd;
|
|
|
|
/* When user accidentally runs "dumpkmap FILE"
|
|
* instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
|
|
* Let's prevent it:
|
|
*/
|
|
if (argv[1])
|
|
bb_show_usage();
|
|
/* bb_warn_ignoring_args(argv[1]);*/
|
|
|
|
fd = get_console_fd_or_die();
|
|
|
|
#define flags bb_common_bufsiz1
|
|
setup_common_bufsiz();
|
|
/* 0 1 2 3 4 5 6 7 8 9 a b c=12 */
|
|
memcpy(flags, "bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1",
|
|
/* Can use sizeof, or sizeof-1. sizeof is even, using that */
|
|
/****/ sizeof("bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1")
|
|
);
|
|
write(STDOUT_FILENO, flags, 7 + MAX_NR_KEYMAPS);
|
|
#define flags7 (flags + 7)
|
|
|
|
for (i = 0; i < 13; i++) {
|
|
if (flags7[i]) {
|
|
for (j = 0; j < NR_KEYS; j++) {
|
|
ke.kb_index = j;
|
|
ke.kb_table = i;
|
|
if (!ioctl_or_perror(fd, KDGKBENT, &ke,
|
|
"ioctl(KDGKBENT{%d,%d}) failed",
|
|
j, i)
|
|
) {
|
|
write(STDOUT_FILENO, &ke.kb_value, 2);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
close(fd);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|