/*
Copyright (C) 1998 BJ Eirich (aka vecna)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public Lic
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include <stdio.h>
#include <conio.h>
#include <dos.h>
#include "timer.h"

// ================================= Data ====================================

char key[128];
char keycode,last_pressed=0;
char codeBuffer[16];
void (__interrupt __far *biosKeyboardHandler)();
char handlerinstalled=0;

unsigned char key_ascii_tbl[128] =
{
   0,   0,   '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 8,   9,
   'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 13,  0,   'a', 's',
   'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', 39,  0,   0,   92,  'z', 'x', 'c', 'v',
   'b', 'n', 'm', ',', '.', '/', 0,   '*', 0,   ' ', 0,   3,   3,   3,   3,   8,
   3,   3,   3,   3,   3,   0,   0,   0,   0,   0,   '-', 0,   0,   0,   '+', 0,
   0,   0,   0,   127, 0,   0,   92,  3,   3,   0,   0,   0,   0,   0,   0,   0,
   13,  0,   '/', 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   127,
   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   '/', 0,   0,   0,   0,   0
};

unsigned char key_shift_tbl[128] =
{
   0,   0,   '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', 126, 126,
   'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', 126, 0,   'A', 'S',
   'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', 34,  0,   0,   '|', 'Z', 'X', 'C', 'V',
   'B', 'N', 'M', '<', '>', '?', 0,   '*', 0,   1,   0,   1,   1,   1,   1,   1,
   1,   1,   1,   1,   1,   0,   0,   0,   0,   0,   '-', 0,   0,   0,   '+', 0,
   0,   0,   1,   127, 0,   0,   0,   1,   1,   0,   0,   0,   0,   0,   0,   0,
   13,  0,   '/', 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   127,
   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   '/', 0,   0,   0,   0,   0
};

// ================================= Data ====================================

void __interrupt __far KeyboardHandler()
{
  keycode=inp(0x60);
  if (keycode>128)
     key[keycode-128]=0;
  else
  {
    key[keycode]=1;
    last_pressed=keycode;
  }
  idlect=0;
  outp(0x20,0x20);
}

void InitKeyboard()
{
  if (handlerinstalled) return;

  biosKeyboardHandler=_dos_getvect(0x09);
  _dos_setvect(0x09, KeyboardHandler);
  handlerinstalled=1;
}

void ShutdownKeyboard()
{
  if (handlerinstalled)
     _dos_setvect(0x09, biosKeyboardHandler);
  handlerinstalled=0;
}