source: MondoRescue/branches/3.2/mindi-busybox/console-tools/dumpkmap.c@ 3232

/* 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.
 *
 */
/* no options, no getopt */

//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"

/* 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;
    RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);

    /* 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();

    write(STDOUT_FILENO, "bkeymap", 7);

    /* Here we want to set everything to 0 except for indexes:
     * [0-2] [4-6] [8-10] [12] */
    memset(flags, 0x00, MAX_NR_KEYMAPS);
    memset(flags, 0x01, 13);
    flags[3] = flags[7] = flags[11] = 0;

    /* dump flags */
    write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);

    for (i = 0; i < MAX_NR_KEYMAPS; i++) {
        if (flags[i] == 1) {
            for (j = 0; j < NR_KEYS; j++) {
                ke.kb_index = j;
                ke.kb_table = i;
                if (!ioctl_or_perror(fd, KDGKBENT, &ke,
                        "ioctl failed with %s, %s, %p",
                        (char *)&ke.kb_index,
                        (char *)&ke.kb_table,
                        &ke.kb_value)
                ) {
                    write(STDOUT_FILENO, (void*)&ke.kb_value, 2);
                }
            }
        }
    }
    if (ENABLE_FEATURE_CLEAN_UP) {
        close(fd);
        RELEASE_CONFIG_BUFFER(flags);
    }
    return EXIT_SUCCESS;
}