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 dumpkmap implementation for busybox
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*
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* Copyright (C) Arne Bernin <arne@matrix.loopback.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config DUMPKMAP
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//config: bool "dumpkmap (1.3 kb)"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: This program dumps the kernel's keyboard translation table to
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//config: stdout, in binary format. You can then use loadkmap to load it.
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//applet:IF_DUMPKMAP(APPLET_NOEXEC(dumpkmap, dumpkmap, BB_DIR_BIN, BB_SUID_DROP, dumpkmap))
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/* bb_common_bufsiz1 usage here is safe wrt NOEXEC: not expecting it to be zeroed. */
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//kbuild:lib-$(CONFIG_DUMPKMAP) += dumpkmap.o
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//usage:#define dumpkmap_trivial_usage
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//usage: "> keymap"
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//usage:#define dumpkmap_full_usage "\n\n"
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//usage: "Print a binary keyboard translation table to stdout"
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//usage:
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//usage:#define dumpkmap_example_usage
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//usage: "$ dumpkmap > keymap\n"
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#include "libbb.h"
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#include "common_bufsiz.h"
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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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#define KDGKBENT 0x4B46 /* gets one entry in translation table */
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/* From <linux/keyboard.h> */
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#define NR_KEYS 128
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#define MAX_NR_KEYMAPS 256
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int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
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{
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struct kbentry ke;
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int i, j, fd;
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/* When user accidentally runs "dumpkmap FILE"
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* instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
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* Let's prevent it:
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*/
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if (argv[1])
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bb_show_usage();
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/* bb_warn_ignoring_args(argv[1]);*/
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fd = get_console_fd_or_die();
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#define flags bb_common_bufsiz1
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setup_common_bufsiz();
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/* 0 1 2 3 4 5 6 7 8 9 a b c=12 */
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memcpy(flags, "bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1",
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/* Can use sizeof, or sizeof-1. sizeof is even, using that */
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/****/ sizeof("bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1")
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);
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write(STDOUT_FILENO, flags, 7 + MAX_NR_KEYMAPS);
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#define flags7 (flags + 7)
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for (i = 0; i < 13; i++) {
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if (flags7[i]) {
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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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if (!ioctl_or_perror(fd, KDGKBENT, &ke,
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"ioctl(KDGKBENT{%d,%d}) failed",
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j, i)
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) {
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write(STDOUT_FILENO, &ke.kb_value, 2);
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}
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}
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(fd);
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}
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return EXIT_SUCCESS;
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}
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