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

/* vi: set sw=4 ts=4: */
/*
 * Mini kbd_mode implementation for busybox
 *
 * Copyright (C) 2007 Loic Grenie <loic.grenie@gmail.com>
 *   written using Andries Brouwer <aeb@cwi.nl>'s kbd_mode from
 *   console-utils v0.2.3, licensed under GNU GPLv2
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

//usage:#define kbd_mode_trivial_usage
//usage:       "[-a|k|s|u] [-C TTY]"
//usage:#define kbd_mode_full_usage "\n\n"
//usage:       "Report or set the keyboard mode\n"
//usage:     "\n    -a  Default (ASCII)"
//usage:     "\n    -k  Medium-raw (keyboard)"
//usage:     "\n    -s  Raw (scancode)"
//usage:     "\n    -u  Unicode (utf-8)"
//usage:     "\n    -C TTY  Affect TTY instead of /dev/tty"

#include "libbb.h"
#include <linux/kd.h>

int kbd_mode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int kbd_mode_main(int argc UNUSED_PARAM, char **argv)
{
    enum {
        SCANCODE  = (1 << 0),
        ASCII     = (1 << 1),
        MEDIUMRAW = (1 << 2),
        UNICODE   = (1 << 3),
    };
    int fd;
    unsigned opt;
    const char *tty_name = CURRENT_TTY;

    opt = getopt32(argv, "sakuC:", &tty_name);
    fd = xopen_nonblocking(tty_name);
    opt &= 0xf; /* clear -C bit, see (*) */

    if (!opt) { /* print current setting */
        const char *mode = "unknown";
        int m;

        xioctl(fd, KDGKBMODE, &m);
        if (m == K_RAW)
            mode = "raw (scancode)";
        else if (m == K_XLATE)
            mode = "default (ASCII)";
        else if (m == K_MEDIUMRAW)
            mode = "mediumraw (keycode)";
        else if (m == K_UNICODE)
            mode = "Unicode (UTF-8)";
        printf("The keyboard is in %s mode\n", mode);
    } else {
        /* here we depend on specific bits assigned to options (*) */
        opt = opt & UNICODE ? 3 : opt >> 1;
        /* double cast prevents warnings about widening conversion */
        xioctl(fd, KDSKBMODE, (void*)(ptrdiff_t)opt);
    }

    if (ENABLE_FEATURE_CLEAN_UP)
        close(fd);
    return EXIT_SUCCESS;
}