arch/dos/key.c

   1 /*
   2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
   3 SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
   4 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
   5 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
   6 IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
   7 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
   8 FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
   9 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  10 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  11 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  12 */
  13 /*
  14  * $Source: /cvs/cvsroot/d2x/arch/dos/key.c,v $
  15  * $Revision: 1.1.1.1 $
  16  * $Author: bradleyb $
  17  * $Date: 2001-01-19 03:30:15 $
  18  *
  19  * Functions for keyboard handler.
  20  *
  21  * $Log: not supported by cvs2svn $
  22  * Revision 1.1.1.1  1999/06/14 21:58:32  donut
  23  * Import of d1x 1.37 source.
  24  *
  25  * Revision 1.35  1995/01/25  20:13:30  john
  26  * Took out not passing keys to debugger if w10.
  27  *
  28  * Revision 1.34  1995/01/14  19:19:31  john
  29  * Made so when you press Shift+Baskspace, it release keys autmatically.
  30  *
  31  * Revision 1.33  1994/12/13  09:21:48  john
  32  * Took out keyd_editor_mode, and KEY_DEBUGGED stuff for NDEBUG versions.
  33  *
  34  * Revision 1.32  1994/11/12  13:52:01  john
  35  * Fixed bug with code that cleared bios buffer.
  36  *
  37  * Revision 1.31  1994/10/24  15:16:16  john
  38  * Added code to detect KEY_PAUSE.
  39  *
  40  * Revision 1.30  1994/10/24  13:57:53  john
  41  * Hacked in support for pause key onto code 0x61.
  42  *
  43  * Revision 1.29  1994/10/21  15:18:13  john
  44  * *** empty log message ***
  45  *
  46  * Revision 1.28  1994/10/21  15:17:24  john
  47  * Made LSHIFT+BACKSPACE do what PrtScr used to.
  48  *
  49  * Revision 1.27  1994/09/22  16:09:18  john
  50  * Fixed some virtual memory lockdown problems with timer and
  51  * joystick.
  52  *
  53  * Revision 1.26  1994/09/15  21:32:47  john
  54  * Added bounds checking for down_count scancode
  55  * parameter.
  56  *
  57  * Revision 1.25  1994/08/31  12:22:20  john
  58  * Added KEY_DEBUGGED
  59  *
  60  * Revision 1.24  1994/08/24  18:53:48  john
  61  * Made Cyberman read like normal mouse; added dpmi module; moved
  62  * mouse from assembly to c. Made mouse buttons return time_down.
  63  *
  64  * Revision 1.23  1994/08/18  15:17:51  john
  65  * *** empty log message ***
  66  *
  67  * Revision 1.22  1994/08/18  15:16:38  john
  68  * fixed some bugs with clear_key_times and then
  69  * removed it because i fixed key_flush to do the
  70  * same.
  71  *
  72  * Revision 1.21  1994/08/17  19:01:25  john
  73  * Attempted to fix a bug with a key being held down
  74  * key_flush called, then the key released having too
  75  * long of a time.
  76  *
  77  * Revision 1.20  1994/08/08  10:43:48  john
  78  * Recorded when a key was pressed for key_inkey_time.
  79  *
  80  * Revision 1.19  1994/06/22  15:00:03  john
  81  * Made keyboard close automatically on exit.
  82  *
  83  * Revision 1.18  1994/06/21  09:16:29  john
  84  * *** empty log message ***
  85  *
  86  * Revision 1.17  1994/06/21  09:08:23  john
  87  * *** empty log message ***
  88  *
  89  * Revision 1.16  1994/06/21  09:05:01  john
  90  * *** empty log message ***
  91  *
  92  * Revision 1.15  1994/06/21  09:04:24  john
  93  * Made PrtScreen do an int5
  94  *
  95  * Revision 1.14  1994/06/17  17:17:06  john
  96  * Added keyd_time_last_key_was_pressed or something like that.
  97  *
  98  * Revision 1.13  1994/05/14  13:55:16  matt
  99  * Added #define to control key passing to bios
 100  *
 101  * Revision 1.12  1994/05/05  18:09:39  john
 102  * Took out BIOS to prevent stuck keys.
 103  *
 104  * Revision 1.11  1994/05/03  17:39:12  john
 105  * *** empty log message ***
 106  *
 107  * Revision 1.10  1994/04/29  12:14:20  john
 108  * Locked all memory used during interrupts so that program
 109  * won't hang when using virtual memory.
 110  *
 111  * Revision 1.9  1994/04/28  23:49:41  john
 112  * Made key_flush flush more keys and also did something else but i forget what.
 113  *
 114  * Revision 1.8  1994/04/22  12:52:12  john
 115  * *** empty log message ***
 116  *
 117  * Revision 1.7  1994/04/01  10:44:59  mike
 118  * Change key_getch() to call getch() if our interrupt hasn't been installed.
 119  *
 120  * Revision 1.6  1994/03/09  10:45:48  john
 121  * Neatend code a bit.
 122  *
 123  * Revision 1.5  1994/02/17  17:24:16  john
 124  * Neatened up a bit.
 125  *
 126  * Revision 1.4  1994/02/17  16:30:29  john
 127  * Put in code to pass keys when in debugger.
 128  *
 129  * Revision 1.3  1994/02/17  15:57:59  john
 130  * Made handler not chain to BIOS handler.
 131  *
 132  * Revision 1.2  1994/02/17  15:56:06  john
 133  * Initial version.
 134  *
 135  * Revision 1.1  1994/02/17  15:54:07  john
 136  * Initial revision
 137  *
 138  *
 139  */
 140
 141 //#define PASS_KEYS_TO_BIOS     1                       //if set, bios gets keys
 142
 143 #ifdef RCS
 144 static char rcsid[] = "$Id: key.c,v 1.1.1.1 2001-01-19 03:30:15 bradleyb Exp $";
 145 #endif
 146
 147 #include <stdlib.h>
 148 #include <stdio.h>
 149 #include <conio.h>
 150 #include <dos.h>
 151 #include <i86.h>
 152
 153 //#define WATCOM_10
 154 #ifdef __DJGPP__
 155 #include <dpmi.h>
 156 #define _far
 157 #define __far
 158 #define __interrupt
 159 #define near
 160 _go32_dpmi_seginfo kbd_hand_info;
 161 #endif
 162 #include "error.h"
 163 #include "key.h"
 164 #include "timer.h"
 165 #include "u_dpmi.h"
 166
 167 #define KEY_BUFFER_SIZE 16
 168
 169
 170 //-------- Variable accessed by outside functions ---------
 171 unsigned char                           keyd_buffer_type;               // 0=No buffer, 1=buffer ASCII, 2=buffer scans
 172 unsigned char                           keyd_repeat;
 173 unsigned char                           keyd_editor_mode;
 174 volatile unsigned char  keyd_last_pressed;
 175 volatile unsigned char  keyd_last_released;
 176 volatile unsigned char  keyd_pressed[256];
 177 volatile int                            keyd_time_when_last_pressed;
 178
 179 typedef struct keyboard {
 180         unsigned short          keybuffer[KEY_BUFFER_SIZE];
 181         fix                                     time_pressed[KEY_BUFFER_SIZE];
 182         fix                                     TimeKeyWentDown[256];
 183         fix                                     TimeKeyHeldDown[256];
 184         unsigned int            NumDowns[256];
 185         unsigned int            NumUps[256];
 186         unsigned int            keyhead, keytail;
 187         unsigned char           E0Flag;
 188         unsigned char           E1Flag;
 189         int                                     in_key_handler;
 190 #ifdef __DJGPP__
 191         _go32_dpmi_seginfo prev_int_9;
 192 #else
 193         void (__interrupt __far *prev_int_9)();
 194 #endif
 195 } keyboard;
 196
 197 static volatile keyboard key_data;
 198
 199 static unsigned char Installed=0;
 200
 201 unsigned char ascii_table[128] =
 202 { 255, 255, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',255,255,
 203   'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 255, 255,
 204   'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', 39, '`',
 205   255, '\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 255,'*',
 206   255, ' ', 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255,255,
 207   255, 255, 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 208   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 209   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 210   255,255,255,255,255,255,255,255 };
 211
 212 unsigned char shifted_ascii_table[128] =
 213 { 255, 255, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',255,255,
 214   'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', 255, 255,
 215   'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',
 216   255, '|', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?', 255,255,
 217   255, ' ', 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255,255,
 218   255, 255, 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 219   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 220   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 221   255,255,255,255,255,255,255,255 };
 222
 223 char * key_text[256] = {
 224 "","ESC","1","2","3","4","5","6","7","8","9","0","-",
 225 "=","BSPC","TAB","Q","W","E","R","T","Y","U","I","O",
 226 "P","[","]","\83","LCTRL","A","S","D","F",
 227 "G","H","J","K","L",";","'","`",
 228 "LSHFT","\\","Z","X","C","V","B","N","M",",",
 229 ".","/","RSHFT","PAD*","LALT","SPC",
 230 "CPSLK","F1","F2","F3","F4","F5","F6","F7","F8","F9",
 231 "F10","NMLCK","SCLK","PAD7","PAD8","PAD9","PAD-",
 232 "PAD4","PAD5","PAD6","PAD+","PAD1","PAD2","PAD3","PAD0",
 233 "PAD.","","","","F11","F12","","","","","","","","","",
 234 "","","","","","","","","","","","","","","","","","","","",
 235 "","","","","","","","","","","","","","","","","","","","",
 236 "","","","","","","","","","","","","","","","","","",
 237 "PAD\83","RCTRL","","","","","","","","","","","","","",
 238 "","","","","","","","","","","PAD/","","","RALT","",
 239 "","","","","","","","","","","","","","HOME","\82","PGUP",
 240 "","\81","","\7f","","END","\80","PGDN","INS",
 241 "DEL","","","","","","","","","","","","","","","","","",
 242 "","","","","","","","","","","","","","","","","","","","",
 243 "","","","","","","" };
 244
 245 unsigned char key_to_ascii(int keycode )
 246 {
 247         int shifted;
 248
 249         shifted = keycode & KEY_SHIFTED;
 250         keycode &= 0xFF;
 251
 252         if ( keycode>=127 )
 253                 return 255;
 254
 255         if (shifted)
 256                 return shifted_ascii_table[keycode];
 257         else
 258                 return ascii_table[keycode];
 259 }
 260
 261 void key_clear_bios_buffer_all()
 262 {
 263 #ifdef __WATCOMC__
 264         // Clear keyboard buffer...
 265         *(ushort *)0x41a=*(ushort *)0x41c;
 266         // Clear the status bits...
 267         *(ubyte *)0x417 = 0;
 268         *(ubyte *)0x418 = 0;
 269 #else
 270         _farpokew(_dos_ds,0x41a, _farpeekw(_dos_ds, 0x41c));
 271         _farpokeb(_dos_ds,0x417, 0);
 272         _farpokeb(_dos_ds,0x418, 0);
 273 #endif
 274 }
 275
 276 void key_clear_bios_buffer()
 277 {
 278 #ifdef __WATCOMC__
 279         // Clear keyboard buffer...
 280         *(ushort *)0x41a=*(ushort *)0x41c;
 281 #else
 282         _farpokew(_dos_ds,0x41a, _farpeekw(_dos_ds, 0x41c));
 283 #endif
 284 }
 285
 286 void key_flush()
 287 {
 288         int i;
 289         fix CurTime;
 290
 291         _disable();
 292
 293         // Clear the BIOS buffer
 294         key_clear_bios_buffer();
 295
 296         key_data.keyhead = key_data.keytail = 0;
 297
 298         //Clear the keyboard buffer
 299         for (i=0; i<KEY_BUFFER_SIZE; i++ )      {
 300                 key_data.keybuffer[i] = 0;
 301                 key_data.time_pressed[i] = 0;
 302         }
 303
 304         //Clear the keyboard array
 305
 306         CurTime =timer_get_fixed_secondsX();
 307
 308         for (i=0; i<256; i++ )  {
 309                 keyd_pressed[i] = 0;
 310                 key_data.TimeKeyWentDown[i] = CurTime;
 311                 key_data.TimeKeyHeldDown[i] = 0;
 312                 key_data.NumDowns[i]=0;
 313                 key_data.NumUps[i]=0;
 314         }
 315         _enable();
 316 }
 317
 318 int add_one( int n )
 319 {
 320         n++;
 321         if ( n >= KEY_BUFFER_SIZE ) n=0;
 322         return n;
 323 }
 324
 325 // Returns 1 if character waiting... 0 otherwise
 326 int key_checkch()
 327 {
 328         int is_one_waiting = 0;
 329
 330         _disable();
 331
 332         key_clear_bios_buffer();
 333
 334         if (key_data.keytail!=key_data.keyhead)
 335                 is_one_waiting = 1;
 336         _enable();
 337         return is_one_waiting;
 338 }
 339
 340 int key_inkey()
 341 {
 342         int key = 0;
 343
 344         _disable();
 345
 346         key_clear_bios_buffer();
 347
 348         if (key_data.keytail!=key_data.keyhead) {
 349                 key = key_data.keybuffer[key_data.keyhead];
 350                 key_data.keyhead = add_one(key_data.keyhead);
 351         }
 352         _enable();
 353         return key;
 354 }
 355
 356 int key_inkey_time(fix * time)
 357 {
 358         int key = 0;
 359
 360         _disable();
 361
 362         key_clear_bios_buffer();
 363
 364         if (key_data.keytail!=key_data.keyhead) {
 365                 key = key_data.keybuffer[key_data.keyhead];
 366                 *time = key_data.time_pressed[key_data.keyhead];
 367                 key_data.keyhead = add_one(key_data.keyhead);
 368         }
 369         _enable();
 370         return key;
 371 }
 372
 373
 374
 375 int key_peekkey()
 376 {
 377         int key = 0;
 378
 379         _disable();
 380
 381         key_clear_bios_buffer();
 382
 383         if (key_data.keytail!=key_data.keyhead) {
 384                 key = key_data.keybuffer[key_data.keyhead];
 385         }
 386         _enable();
 387         return key;
 388 }
 389
 390 // If not installed, uses BIOS and returns getch();
 391 //      Else returns pending key (or waits for one if none waiting).
 392 int key_getch()
 393 {
 394         int dummy=0;
 395
 396         if (!Installed)
 397                 return getch();
 398
 399         while (!key_checkch())
 400                 dummy++;
 401         return key_inkey();
 402 }
 403
 404 unsigned int key_get_shift_status()
 405 {
 406         unsigned int shift_status = 0;
 407
 408         _disable();
 409
 410         key_clear_bios_buffer();
 411
 412         if ( keyd_pressed[KEY_LSHIFT] || keyd_pressed[KEY_RSHIFT] )
 413                 shift_status |= KEY_SHIFTED;
 414
 415         if ( keyd_pressed[KEY_LALT] || keyd_pressed[KEY_RALT] )
 416                 shift_status |= KEY_ALTED;
 417
 418         if ( keyd_pressed[KEY_LCTRL] || keyd_pressed[KEY_RCTRL] )
 419                 shift_status |= KEY_CTRLED;
 420
 421 #ifndef NDEBUG
 422         if (keyd_pressed[KEY_DELETE])
 423                 shift_status |=KEY_DEBUGGED;
 424 #endif
 425
 426         _enable();
 427
 428         return shift_status;
 429 }
 430
 431 // Returns the number of seconds this key has been down since last call.
 432 fix key_down_time(int scancode) {
 433         fix time_down, time;
 434
 435         if ((scancode<0)|| (scancode>255)) return 0;
 436
 437 #ifndef NDEBUG
 438         if (keyd_editor_mode && key_get_shift_status() )
 439                 return 0;
 440 #endif
 441
 442         _disable();
 443
 444         if ( !keyd_pressed[scancode] )  {
 445                 time_down = key_data.TimeKeyHeldDown[scancode];
 446                 key_data.TimeKeyHeldDown[scancode] = 0;
 447         } else  {
 448                 time = timer_get_fixed_secondsX();
 449                 time_down =  time - key_data.TimeKeyWentDown[scancode];
 450                 key_data.TimeKeyWentDown[scancode] = time;
 451         }
 452         _enable();
 453
 454         return time_down;
 455 }
 456
 457 // Returns number of times key has went from up to down since last call.
 458 unsigned int key_down_count(int scancode)       {
 459         int n;
 460
 461         if ((scancode<0)|| (scancode>255)) return 0;
 462
 463         _disable();
 464         n = key_data.NumDowns[scancode];
 465         key_data.NumDowns[scancode] = 0;
 466         _enable();
 467
 468         return n;
 469 }
 470
 471
 472 // Returns number of times key has went from down to up since last call.
 473 unsigned int key_up_count(int scancode) {
 474         int n;
 475
 476         if ((scancode<0)|| (scancode>255)) return 0;
 477
 478         _disable();
 479         n = key_data.NumUps[scancode];
 480         key_data.NumUps[scancode] = 0;
 481         _enable();
 482
 483         return n;
 484 }
 485
 486 // Use intrinsic forms so that we stay in the locked interrup code.
 487
 488 #ifdef __WATCOMC__
 489 void Int5();
 490 #pragma aux Int5 = "int 5";
 491 #else
 492 #ifdef __GNUC__
 493 #define Int5() asm volatile("int $5")
 494 #endif
 495 #endif
 496
 497 #pragma off (check_stack)
 498 void __interrupt __far key_handler()
 499 {
 500         unsigned char scancode, breakbit, temp;
 501         unsigned short keycode;
 502
 503 #ifndef WATCOM_10
 504 #ifndef NDEBUG
 505 #ifdef __WATCOMC__ /* must have _chain_intr */
 506         ubyte * MONO = (ubyte *)(0x0b0000+24*80*2);
 507         if (  ((MONO[0]=='D') && (MONO[2]=='B') && (MONO[4]=='G') && (MONO[6]=='>')) ||
 508                         ((MONO[14]=='<') && (MONO[16]=='i') && (MONO[18]=='>') && (MONO[20]==' ') && (MONO[22]=='-')) ||
 509                         ((MONO[0]==200 ) && (MONO[2]==27) && (MONO[4]==17) )
 510                 )
 511                 _chain_intr( key_data.prev_int_9 );
 512 #endif
 513 #endif
 514 #endif
 515
 516         // Read in scancode
 517         scancode = inp( 0x60 );
 518
 519         switch( scancode )      {
 520         case 0xE0:
 521                 key_data.E0Flag = 0x80;
 522                 break;
 523         default:
 524                 // Parse scancode and break bit
 525                 if (key_data.E1Flag > 0 )       {               // Special code for Pause, which is E1 1D 45 E1 9D C5
 526                         key_data.E1Flag--;
 527                         if ( scancode == 0x1D ) {
 528                                 scancode        = KEY_PAUSE;
 529                                 breakbit        = 0;
 530                         } else if ( scancode == 0x9d ) {
 531                                 scancode        = KEY_PAUSE;
 532                                 breakbit        = 1;
 533                         } else {
 534                                 break;          // skip this keycode
 535                         }
 536                 } else if ( scancode==0xE1 )    {
 537                         key_data.E1Flag = 2;
 538                         break;
 539                 } else {
 540                         breakbit        = scancode & 0x80;              // Get make/break bit
 541                         scancode &= 0x7f;                                               // Strip make/break bit off of scancode
 542                         scancode |= key_data.E0Flag;                                    // Add in extended key code
 543                 }
 544                 key_data.E0Flag = 0;                                                            // Clear extended key code
 545
 546                 if (breakbit)   {
 547                         // Key going up
 548                         keyd_last_released = scancode;
 549                         keyd_pressed[scancode] = 0;
 550                         key_data.NumUps[scancode]++;
 551                         temp = 0;
 552                         temp |= keyd_pressed[KEY_LSHIFT] || keyd_pressed[KEY_RSHIFT];
 553                         temp |= keyd_pressed[KEY_LALT] || keyd_pressed[KEY_RALT];
 554                         temp |= keyd_pressed[KEY_LCTRL] || keyd_pressed[KEY_RCTRL];
 555 #ifndef NDEBUG
 556                         temp |= keyd_pressed[KEY_DELETE];
 557                         if ( !(keyd_editor_mode && temp) )
 558 #endif          // NOTICE LINK TO ABOVE IF!!!!
 559                                 key_data.TimeKeyHeldDown[scancode] += timer_get_fixed_secondsX() - key_data.TimeKeyWentDown[scancode];
 560                 } else {
 561                         // Key going down
 562                         keyd_last_pressed = scancode;
 563                         keyd_time_when_last_pressed = timer_get_fixed_secondsX();
 564                         if (!keyd_pressed[scancode])    {
 565                                 // First time down
 566                                 key_data.TimeKeyWentDown[scancode] = timer_get_fixed_secondsX();
 567                                 keyd_pressed[scancode] = 1;
 568                                 key_data.NumDowns[scancode]++;
 569 #ifndef NDEBUG
 570                                 if ( (keyd_pressed[KEY_LSHIFT]) && (scancode == KEY_BACKSP) )   {
 571                                         keyd_pressed[KEY_LSHIFT] = 0;
 572                                         Int5();
 573                                 }
 574 #endif
 575                         } else if (!keyd_repeat) {
 576                                 // Don't buffer repeating key if repeat mode is off
 577                                 scancode = 0xAA;
 578                         }
 579
 580                         if ( scancode!=0xAA ) {
 581                                 keycode = scancode;
 582
 583                                 if ( keyd_pressed[KEY_LSHIFT] || keyd_pressed[KEY_RSHIFT] )
 584                                         keycode |= KEY_SHIFTED;
 585
 586                                 if ( keyd_pressed[KEY_LALT] || keyd_pressed[KEY_RALT] )
 587                                         keycode |= KEY_ALTED;
 588
 589                                 if ( keyd_pressed[KEY_LCTRL] || keyd_pressed[KEY_RCTRL] )
 590                                         keycode |= KEY_CTRLED;
 591
 592 #ifndef NDEBUG
 593                                 if ( keyd_pressed[KEY_DELETE] )
 594                                         keycode |= KEY_DEBUGGED;
 595 #endif
 596
 597                                 temp = key_data.keytail+1;
 598                                 if ( temp >= KEY_BUFFER_SIZE ) temp=0;
 599
 600                                 if (temp!=key_data.keyhead)     {
 601                                         key_data.keybuffer[key_data.keytail] = keycode;
 602                                         key_data.time_pressed[key_data.keytail] = keyd_time_when_last_pressed;
 603                                         key_data.keytail = temp;
 604                                 }
 605                         }
 606                 }
 607         }
 608
 609 #ifndef NDEBUG
 610 #ifdef PASS_KEYS_TO_BIOS
 611         _chain_intr( key_data.prev_int_9 );
 612 #endif
 613 #endif
 614
 615         temp = inp(0x61);               // Get current port 61h state
 616         temp |= 0x80;                   // Turn on bit 7 to signal clear keybrd
 617         outp( 0x61, temp );     // Send to port
 618         temp &= 0x7f;                   // Turn off bit 7 to signal break
 619         outp( 0x61, temp );     // Send to port
 620         outp( 0x20, 0x20 );     // Reset interrupt controller
 621 }
 622
 623 #pragma on (check_stack)
 624
 625 void key_handler_end()  {               // Dummy function to help calculate size of keyboard handler function
 626 }
 627
 628 void key_init()
 629 {
 630         // Initialize queue
 631
 632         keyd_time_when_last_pressed = timer_get_fixed_seconds();
 633         keyd_buffer_type = 1;
 634         keyd_repeat = 1;
 635         key_data.in_key_handler = 0;
 636         key_data.E0Flag = 0;
 637         key_data.E1Flag = 0;
 638
 639         // Clear the keyboard array
 640         key_flush();
 641
 642         if (Installed) return;
 643         Installed = 1;
 644
 645         //--------------- lock everything for the virtal memory ----------------------------------
 646         if (!dpmi_lock_region ((void near *)key_handler, (char *)key_handler_end - (char near *)key_handler))   {
 647                 printf( "Error locking keyboard handler!\n" );
 648                 exit(1);
 649         }
 650         if (!dpmi_lock_region ((void *)&key_data, sizeof(keyboard)))    {
 651                 printf( "Error locking keyboard handler's data1!\n" );
 652                 exit(1);
 653         }
 654         if (!dpmi_lock_region (&keyd_buffer_type, sizeof(char)))        {
 655                 printf( "Error locking keyboard handler's data2!\n" );
 656                 exit(1);
 657         }
 658         if (!dpmi_lock_region (&keyd_repeat, sizeof(char)))     {
 659                 printf( "Error locking keyboard handler's data3!\n" );
 660                 exit(1);
 661         }
 662         if (!dpmi_lock_region (&keyd_editor_mode, sizeof(char)))        {
 663                 printf( "Error locking keyboard handler's data4!\n" );
 664                 exit(1);
 665         }
 666         if (!dpmi_lock_region ((void *)&keyd_last_pressed, sizeof(char)))       {
 667                 printf( "Error locking keyboard handler's data5!\n" );
 668                 exit(1);
 669         }
 670         if (!dpmi_lock_region ((void *)&keyd_last_released, sizeof(char)))      {
 671                 printf( "Error locking keyboard handler's data6!\n" );
 672                 exit(1);
 673         }
 674         if (!dpmi_lock_region ((void *)&keyd_pressed, sizeof(char)*256))        {
 675                 printf( "Error locking keyboard handler's data7!\n" );
 676                 exit(1);
 677         }
 678         if (!dpmi_lock_region ((void *)&keyd_time_when_last_pressed, sizeof(int)))      {
 679                 printf( "Error locking keyboard handler's data8!\n" );
 680                 exit(1);
 681         }
 682
 683 #ifndef __DJGPP__
 684         key_data.prev_int_9 = (void *)_dos_getvect( 9 );
 685     _dos_setvect( 9, key_handler );
 686 #else
 687         _go32_dpmi_get_protected_mode_interrupt_vector(9,
 688          (_go32_dpmi_seginfo *)&key_data.prev_int_9);
 689         kbd_hand_info.pm_offset = (int)key_handler;
 690         kbd_hand_info.pm_selector = _my_cs();
 691         _go32_dpmi_allocate_iret_wrapper(&kbd_hand_info);
 692         _go32_dpmi_set_protected_mode_interrupt_vector(9, &kbd_hand_info);
 693 #endif
 694
 695         atexit( key_close );
 696 }
 697
 698 void key_close()
 699 {
 700         if (!Installed) return;
 701         Installed = 0;
 702
 703 #ifndef __DJGPP__
 704         _dos_setvect( 9, key_data.prev_int_9 );
 705 #else
 706         _go32_dpmi_set_protected_mode_interrupt_vector(9,
 707          (_go32_dpmi_seginfo *)&key_data.prev_int_9);
 708 #endif
 709
 710         _disable();
 711         key_clear_bios_buffer_all();
 712         _enable();
 713
 714 }