release/src/router/busybox/console-tools/setkeycodes.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * setkeycodes
   4  *
   5  * Copyright (C) 1994-1998 Andries E. Brouwer <aeb@cwi.nl>
   6  *
   7  * Adjusted for BusyBox by Erik Andersen <andersen@codepoet.org>
   8  *
   9  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  10  */
  11
  12 //usage:#define setkeycodes_trivial_usage
  13 //usage:       "SCANCODE KEYCODE..."
  14 //usage:#define setkeycodes_full_usage "\n\n"
  15 //usage:       "Set entries into the kernel's scancode-to-keycode map,\n"
  16 //usage:       "allowing unusual keyboards to generate usable keycodes.\n\n"
  17 //usage:       "SCANCODE may be either xx or e0xx (hexadecimal),\n"
  18 //usage:       "and KEYCODE is given in decimal."
  19 //usage:
  20 //usage:#define setkeycodes_example_usage
  21 //usage:       "$ setkeycodes e030 127\n"
  22
  23 #include "libbb.h"
  24
  25 /* From <linux/kd.h> */
  26 struct kbkeycode {
  27         unsigned scancode, keycode;
  28 };
  29 enum {
  30         KDSETKEYCODE = 0x4B4D  /* write kernel keycode table entry */
  31 };
  32
  33 int setkeycodes_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  34 int setkeycodes_main(int argc, char **argv)
  35 {
  36         int fd;
  37         struct kbkeycode a;
  38
  39         if (!(argc & 1) /* if even */ || argc < 2) {
  40                 bb_show_usage();
  41         }
  42
  43         fd = get_console_fd_or_die();
  44
  45         while (argv[1]) {
  46                 int sc = xstrtoul_range(argv[1], 16, 0, 0xe07f);
  47                 if (sc >= 0xe000) {
  48                         sc -= 0xe000;
  49                         sc += 0x0080;
  50                 }
  51                 a.scancode = sc;
  52                 a.keycode = xatou_range(argv[2], 0, 255);
  53                 ioctl_or_perror_and_die(fd, KDSETKEYCODE, &a,
  54                         "can't set SCANCODE %x to KEYCODE %d",
  55                         sc, a.keycode);
  56                 argv += 2;
  57         }
  58         return EXIT_SUCCESS;
  59 }