input/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 /*
  15  * $Source: /cvs/cvsroot/d2x/input/dos_key.c,v $
  16  * $Revision: 1.2 $
  17  * $Author: bradleyb $
  18  * $Date: 2001-01-29 14:03:57 $
  19  *
  20  * Functions for keyboard handler.
  21  *
  22  * $Log: not supported by cvs2svn $
  23  * Revision 1.1.1.2  2001/01/19 03:33:52  bradleyb
  24  * Import of d2x-0.0.9-pre1
  25  *
  26  * Revision 1.1.1.1  1999/06/14 21:58:32  donut
  27  * Import of d1x 1.37 source.
  28  *
  29  * Revision 1.35  1995/01/25  20:13:30  john
  30  * Took out not passing keys to debugger if w10.
  31  *
  32  * Revision 1.34  1995/01/14  19:19:31  john
  33  * Made so when you press Shift+Baskspace, it release keys autmatically.
  34  *
  35  * Revision 1.33  1994/12/13  09:21:48  john
  36  * Took out keyd_editor_mode, and KEY_DEBUGGED stuff for NDEBUG versions.
  37  *
  38  * Revision 1.32  1994/11/12  13:52:01  john
  39  * Fixed bug with code that cleared bios buffer.
  40  *
  41  * Revision 1.31  1994/10/24  15:16:16  john
  42  * Added code to detect KEY_PAUSE.
  43  *
  44  * Revision 1.30  1994/10/24  13:57:53  john
  45  * Hacked in support for pause key onto code 0x61.
  46  *
  47  * Revision 1.29  1994/10/21  15:18:13  john
  48  * *** empty log message ***
  49  *
  50  * Revision 1.28  1994/10/21  15:17:24  john
  51  * Made LSHIFT+BACKSPACE do what PrtScr used to.
  52  *
  53  * Revision 1.27  1994/09/22  16:09:18  john
  54  * Fixed some virtual memory lockdown problems with timer and
  55  * joystick.
  56  *
  57  * Revision 1.26  1994/09/15  21:32:47  john
  58  * Added bounds checking for down_count scancode
  59  * parameter.
  60  *
  61  * Revision 1.25  1994/08/31  12:22:20  john
  62  * Added KEY_DEBUGGED
  63  *
  64  * Revision 1.24  1994/08/24  18:53:48  john
  65  * Made Cyberman read like normal mouse; added dpmi module; moved
  66  * mouse from assembly to c. Made mouse buttons return time_down.
  67  *
  68  * Revision 1.23  1994/08/18  15:17:51  john
  69  * *** empty log message ***
  70  *
  71  * Revision 1.22  1994/08/18  15:16:38  john
  72  * fixed some bugs with clear_key_times and then
  73  * removed it because i fixed key_flush to do the
  74  * same.
  75  *
  76  * Revision 1.21  1994/08/17  19:01:25  john
  77  * Attempted to fix a bug with a key being held down
  78  * key_flush called, then the key released having too
  79  * long of a time.
  80  *
  81  * Revision 1.20  1994/08/08  10:43:48  john
  82  * Recorded when a key was pressed for key_inkey_time.
  83  *
  84  * Revision 1.19  1994/06/22  15:00:03  john
  85  * Made keyboard close automatically on exit.
  86  *
  87  * Revision 1.18  1994/06/21  09:16:29  john
  88  * *** empty log message ***
  89  *
  90  * Revision 1.17  1994/06/21  09:08:23  john
  91  * *** empty log message ***
  92  *
  93  * Revision 1.16  1994/06/21  09:05:01  john
  94  * *** empty log message ***
  95  *
  96  * Revision 1.15  1994/06/21  09:04:24  john
  97  * Made PrtScreen do an int5
  98  *
  99  * Revision 1.14  1994/06/17  17:17:06  john
 100  * Added keyd_time_last_key_was_pressed or something like that.
 101  *
 102  * Revision 1.13  1994/05/14  13:55:16  matt
 103  * Added #define to control key passing to bios
 104  *
 105  * Revision 1.12  1994/05/05  18:09:39  john
 106  * Took out BIOS to prevent stuck keys.
 107  *
 108  * Revision 1.11  1994/05/03  17:39:12  john
 109  * *** empty log message ***
 110  *
 111  * Revision 1.10  1994/04/29  12:14:20  john
 112  * Locked all memory used during interrupts so that program
 113  * won't hang when using virtual memory.
 114  *
 115  * Revision 1.9  1994/04/28  23:49:41  john
 116  * Made key_flush flush more keys and also did something else but i forget what.
 117  *
 118  * Revision 1.8  1994/04/22  12:52:12  john
 119  * *** empty log message ***
 120  *
 121  * Revision 1.7  1994/04/01  10:44:59  mike
 122  * Change key_getch() to call getch() if our interrupt hasn't been installed.
 123  *
 124  * Revision 1.6  1994/03/09  10:45:48  john
 125  * Neatend code a bit.
 126  *
 127  * Revision 1.5  1994/02/17  17:24:16  john
 128  * Neatened up a bit.
 129  *
 130  * Revision 1.4  1994/02/17  16:30:29  john
 131  * Put in code to pass keys when in debugger.
 132  *
 133  * Revision 1.3  1994/02/17  15:57:59  john
 134  * Made handler not chain to BIOS handler.
 135  *
 136  * Revision 1.2  1994/02/17  15:56:06  john
 137  * Initial version.
 138  *
 139  * Revision 1.1  1994/02/17  15:54:07  john
 140  * Initial revision
 141  *
 142  *
 143  */
 144
 145 //#define PASS_KEYS_TO_BIOS     1                       //if set, bios gets keys
 146
 147 #ifdef HAVE_CONFIG_H
 148 #include <conf.h>
 149 #endif
 150
 151 #include <stdlib.h>
 152 #include <stdio.h>
 153 #include <dos.h>
 154
 155 //#define WATCOM_10
 156 #ifdef __DJGPP__
 157 #include <dpmi.h>
 158 #define _far
 159 #define __far
 160 #define __interrupt
 161 #define near
 162 _go32_dpmi_seginfo kbd_hand_info;
 163 #endif
 164 #include "error.h"
 165 #include "key.h"
 166 #include "timer.h"
 167 #include "u_dpmi.h"
 168
 169 #define KEY_BUFFER_SIZE 16
 170
 171
 172 //-------- Variable accessed by outside functions ---------
 173 unsigned char                           keyd_buffer_type;               // 0=No buffer, 1=buffer ASCII, 2=buffer scans
 174 unsigned char                           keyd_repeat;
 175 unsigned char                           keyd_editor_mode;
 176 volatile unsigned char  keyd_last_pressed;
 177 volatile unsigned char  keyd_last_released;
 178 volatile unsigned char  keyd_pressed[256];
 179 volatile int                            keyd_time_when_last_pressed;
 180
 181 typedef struct keyboard {
 182         unsigned short          keybuffer[KEY_BUFFER_SIZE];
 183         fix                                     time_pressed[KEY_BUFFER_SIZE];
 184         fix                                     TimeKeyWentDown[256];
 185         fix                                     TimeKeyHeldDown[256];
 186         unsigned int            NumDowns[256];
 187         unsigned int            NumUps[256];
 188         unsigned int            keyhead, keytail;
 189         unsigned char           E0Flag;
 190         unsigned char           E1Flag;
 191         int                                     in_key_handler;
 192 #ifdef __DJGPP__
 193         _go32_dpmi_seginfo prev_int_9;
 194 #else
 195         void (__interrupt __far *prev_int_9)();
 196 #endif
 197 } keyboard;
 198
 199 static volatile keyboard key_data;
 200
 201 static unsigned char Installed=0;
 202
 203 unsigned char ascii_table[128] =
 204 { 255, 255, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',255,255,
 205   'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 255, 255,
 206   'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', 39, '`',
 207   255, '\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 255,'*',
 208   255, ' ', 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255,255,
 209   255, 255, 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 210   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 211   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 212   255,255,255,255,255,255,255,255 };
 213
 214 unsigned char shifted_ascii_table[128] =
 215 { 255, 255, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',255,255,
 216   'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', 255, 255,
 217   'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',
 218   255, '|', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?', 255,255,
 219   255, ' ', 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255,255,
 220   255, 255, 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 221   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 222   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 223   255,255,255,255,255,255,255,255 };
 224 /*
 225 char * key_text[256] = {
 226 "","ESC","1","2","3","4","5","6","7","8","9","0","-",
 227 "=","BSPC","TAB","Q","W","E","R","T","Y","U","I","O",
 228 "P","[","]","\83","LCTRL","A","S","D","F",
 229 "G","H","J","K","L",";","'","`",
 230 "LSHFT","\\","Z","X","C","V","B","N","M",",",
 231 ".","/","RSHFT","PAD*","LALT","SPC",
 232 "CPSLK","F1","F2","F3","F4","F5","F6","F7","F8","F9",
 233 "F10","NMLCK","SCLK","PAD7","PAD8","PAD9","PAD-",
 234 "PAD4","PAD5","PAD6","PAD+","PAD1","PAD2","PAD3","PAD0",
 235 "PAD.","","","","F11","F12","","","","","","","","","",
 236 "","","","","","","","","","","","","","","","","","","","",
 237 "","","","","","","","","","","","","","","","","","","","",
 238 "","","","","","","","","","","","","","","","","","",
 239 "PAD\83","RCTRL","","","","","","","","","","","","","",
 240 "","","","","","","","","","","PAD/","","","RALT","",
 241 "","","","","","","","","","","","","","HOME","\82","PGUP",
 242 "","\81","","\7f","","END","\80","PGDN","INS",
 243 "DEL","","","","","","","","","","","","","","","","","",
 244 "","","","","","","","","","","","","","","","","","","","",
 245 "","","","","","","" };
 246 */
 247 unsigned char key_to_ascii(int keycode )
 248 {
 249         int shifted;
 250
 251         shifted = keycode & KEY_SHIFTED;
 252         keycode &= 0xFF;
 253
 254         if ( keycode>=127 )
 255                 return 255;
 256
 257         if (shifted)
 258                 return shifted_ascii_table[keycode];
 259         else
 260                 return ascii_table[keycode];
 261 }
 262
 263 void key_clear_bios_buffer_all()
 264 {
 265 #ifdef __WATCOMC__
 266         // Clear keyboard buffer...
 267         *(ushort *)0x41a=*(ushort *)0x41c;
 268         // Clear the status bits...
 269         *(ubyte *)0x417 = 0;
 270         *(ubyte *)0x418 = 0;
 271 #else
 272         _farpokew(_dos_ds,0x41a, _farpeekw(_dos_ds, 0x41c));
 273         _farpokeb(_dos_ds,0x417, 0);
 274         _farpokeb(_dos_ds,0x418, 0);
 275 #endif
 276 }
 277
 278 void key_clear_bios_buffer()
 279 {
 280 #ifdef __WATCOMC__
 281         // Clear keyboard buffer...
 282         *(ushort *)0x41a=*(ushort *)0x41c;
 283 #else
 284         _farpokew(_dos_ds,0x41a, _farpeekw(_dos_ds, 0x41c));
 285 #endif
 286 }
 287
 288 void key_flush()
 289 {
 290         int i;
 291         fix CurTime;
 292
 293         _disable();
 294
 295         // Clear the BIOS buffer
 296         key_clear_bios_buffer();
 297
 298         key_data.keyhead = key_data.keytail = 0;
 299
 300         //Clear the keyboard buffer
 301         for (i=0; i<KEY_BUFFER_SIZE; i++ )      {
 302                 key_data.keybuffer[i] = 0;
 303                 key_data.time_pressed[i] = 0;
 304         }
 305
 306         //Clear the keyboard array
 307
 308         CurTime =timer_get_fixed_secondsX();
 309
 310         for (i=0; i<256; i++ )  {
 311                 keyd_pressed[i] = 0;
 312                 key_data.TimeKeyWentDown[i] = CurTime;
 313                 key_data.TimeKeyHeldDown[i] = 0;
 314                 key_data.NumDowns[i]=0;
 315                 key_data.NumUps[i]=0;
 316         }
 317         _enable();
 318 }
 319
 320 int add_one( int n )
 321 {
 322         n++;
 323         if ( n >= KEY_BUFFER_SIZE ) n=0;
 324         return n;
 325 }
 326
 327 // Returns 1 if character waiting... 0 otherwise
 328 int key_checkch()
 329 {
 330         int is_one_waiting = 0;
 331
 332         _disable();
 333
 334         key_clear_bios_buffer();
 335
 336         if (key_data.keytail!=key_data.keyhead)
 337                 is_one_waiting = 1;
 338         _enable();
 339         return is_one_waiting;
 340 }
 341
 342 int key_inkey()
 343 {
 344         int key = 0;
 345
 346         _disable();
 347
 348         key_clear_bios_buffer();
 349
 350         if (key_data.keytail!=key_data.keyhead) {
 351                 key = key_data.keybuffer[key_data.keyhead];
 352                 key_data.keyhead = add_one(key_data.keyhead);
 353         }
 354         _enable();
 355         return key;
 356 }
 357
 358 int key_inkey_time(fix * time)
 359 {
 360         int key = 0;
 361
 362         _disable();
 363
 364         key_clear_bios_buffer();
 365
 366         if (key_data.keytail!=key_data.keyhead) {
 367                 key = key_data.keybuffer[key_data.keyhead];
 368                 *time = key_data.time_pressed[key_data.keyhead];
 369                 key_data.keyhead = add_one(key_data.keyhead);
 370         }
 371         _enable();
 372         return key;
 373 }
 374
 375
 376
 377 int key_peekkey()
 378 {
 379         int key = 0;
 380
 381         _disable();
 382
 383         key_clear_bios_buffer();
 384
 385         if (key_data.keytail!=key_data.keyhead) {
 386                 key = key_data.keybuffer[key_data.keyhead];
 387         }
 388         _enable();
 389         return key;
 390 }
 391
 392 // If not installed, uses BIOS and returns getch();
 393 //      Else returns pending key (or waits for one if none waiting).
 394 int key_getch()
 395 {
 396         int dummy=0;
 397
 398         if (!Installed)
 399                 return getch();
 400
 401         while (!key_checkch())
 402                 dummy++;
 403         return key_inkey();
 404 }
 405
 406 unsigned int key_get_shift_status()
 407 {
 408         unsigned int shift_status = 0;
 409
 410         _disable();
 411
 412         key_clear_bios_buffer();
 413
 414         if ( keyd_pressed[KEY_LSHIFT] || keyd_pressed[KEY_RSHIFT] )
 415                 shift_status |= KEY_SHIFTED;
 416
 417         if ( keyd_pressed[KEY_LALT] || keyd_pressed[KEY_RALT] )
 418                 shift_status |= KEY_ALTED;
 419
 420         if ( keyd_pressed[KEY_LCTRL] || keyd_pressed[KEY_RCTRL] )
 421                 shift_status |= KEY_CTRLED;
 422
 423 #ifndef NDEBUG
 424         if (keyd_pressed[KEY_DELETE])
 425                 shift_status |=KEY_DEBUGGED;
 426 #endif
 427
 428         _enable();
 429
 430         return shift_status;
 431 }
 432
 433 // Returns the number of seconds this key has been down since last call.
 434 fix key_down_time(int scancode) {
 435         fix time_down, time;
 436
 437         if ((scancode<0)|| (scancode>255)) return 0;
 438
 439 #ifndef NDEBUG
 440         if (keyd_editor_mode && key_get_shift_status() )
 441                 return 0;
 442 #endif
 443
 444         _disable();
 445
 446         if ( !keyd_pressed[scancode] )  {
 447                 time_down = key_data.TimeKeyHeldDown[scancode];
 448                 key_data.TimeKeyHeldDown[scancode] = 0;
 449         } else  {
 450                 time = timer_get_fixed_secondsX();
 451                 time_down =  time - key_data.TimeKeyWentDown[scancode];
 452                 key_data.TimeKeyWentDown[scancode] = time;
 453         }
 454         _enable();
 455
 456         return time_down;
 457 }
 458
 459 // Returns number of times key has went from up to down since last call.
 460 unsigned int key_down_count(int scancode)       {
 461         int n;
 462
 463         if ((scancode<0)|| (scancode>255)) return 0;
 464
 465         _disable();
 466         n = key_data.NumDowns[scancode];
 467         key_data.NumDowns[scancode] = 0;
 468         _enable();
 469
 470         return n;
 471 }
 472
 473
 474 // Returns number of times key has went from down to up since last call.
 475 unsigned int key_up_count(int scancode) {
 476         int n;
 477
 478         if ((scancode<0)|| (scancode>255)) return 0;
 479
 480         _disable();
 481         n = key_data.NumUps[scancode];
 482         key_data.NumUps[scancode] = 0;
 483         _enable();
 484
 485         return n;
 486 }
 487
 488 // Use intrinsic forms so that we stay in the locked interrup code.
 489
 490 #ifdef __WATCOMC__
 491 void Int5();
 492 #pragma aux Int5 = "int 5";
 493 #else
 494 #ifdef __GNUC__
 495 #define Int5() asm volatile("int $5")
 496 #endif
 497 #endif
 498
 499 void __interrupt __far key_handler()
 500 {
 501         unsigned char scancode, breakbit, temp;
 502         unsigned short keycode;
 503
 504 #ifndef WATCOM_10
 505 #ifndef NDEBUG
 506 #ifdef __WATCOMC__ /* must have _chain_intr */
 507         ubyte * MONO = (ubyte *)(0x0b0000+24*80*2);
 508         if (  ((MONO[0]=='D') && (MONO[2]=='B') && (MONO[4]=='G') && (MONO[6]=='>')) ||
 509                         ((MONO[14]=='<') && (MONO[16]=='i') && (MONO[18]=='>') && (MONO[20]==' ') && (MONO[22]=='-')) ||
 510                         ((MONO[0]==200 ) && (MONO[2]==27) && (MONO[4]==17) )
 511                 )
 512                 _chain_intr( key_data.prev_int_9 );
 513 #endif
 514 #endif
 515 #endif
 516
 517         // Read in scancode
 518         scancode = inp( 0x60 );
 519
 520         switch( scancode )      {
 521         case 0xE0:
 522                 key_data.E0Flag = 0x80;
 523                 break;
 524         default:
 525                 // Parse scancode and break bit
 526                 if (key_data.E1Flag > 0 )       {               // Special code for Pause, which is E1 1D 45 E1 9D C5
 527                         key_data.E1Flag--;
 528                         if ( scancode == 0x1D ) {
 529                                 scancode        = KEY_PAUSE;
 530                                 breakbit        = 0;
 531                         } else if ( scancode == 0x9d ) {
 532                                 scancode        = KEY_PAUSE;
 533                                 breakbit        = 1;
 534                         } else {
 535                                 break;          // skip this keycode
 536                         }
 537                 } else if ( scancode==0xE1 )    {
 538                         key_data.E1Flag = 2;
 539                         break;
 540                 } else {
 541                         breakbit        = scancode & 0x80;              // Get make/break bit
 542                         scancode &= 0x7f;                                               // Strip make/break bit off of scancode
 543                         scancode |= key_data.E0Flag;                                    // Add in extended key code
 544                 }
 545                 key_data.E0Flag = 0;                                                            // Clear extended key code
 546
 547                 if (breakbit)   {
 548                         // Key going up
 549                         keyd_last_released = scancode;
 550                         keyd_pressed[scancode] = 0;
 551                         key_data.NumUps[scancode]++;
 552                         temp = 0;
 553                         temp |= keyd_pressed[KEY_LSHIFT] || keyd_pressed[KEY_RSHIFT];
 554                         temp |= keyd_pressed[KEY_LALT] || keyd_pressed[KEY_RALT];
 555                         temp |= keyd_pressed[KEY_LCTRL] || keyd_pressed[KEY_RCTRL];
 556 #ifndef NDEBUG
 557                         temp |= keyd_pressed[KEY_DELETE];
 558                         if ( !(keyd_editor_mode && temp) )
 559 #endif          // NOTICE LINK TO ABOVE IF!!!!
 560                                 key_data.TimeKeyHeldDown[scancode] += timer_get_fixed_secondsX() - key_data.TimeKeyWentDown[scancode];
 561                 } else {
 562                         // Key going down
 563                         keyd_last_pressed = scancode;
 564                         keyd_time_when_last_pressed = timer_get_fixed_secondsX();
 565                         if (!keyd_pressed[scancode])    {
 566                                 // First time down
 567                                 key_data.TimeKeyWentDown[scancode] = timer_get_fixed_secondsX();
 568                                 keyd_pressed[scancode] = 1;
 569                                 key_data.NumDowns[scancode]++;
 570 #ifndef NDEBUG
 571                                 if ( (keyd_pressed[KEY_LSHIFT]) && (scancode == KEY_BACKSP) )   {
 572                                         keyd_pressed[KEY_LSHIFT] = 0;
 573                                         Int5();
 574                                 }
 575 #endif
 576                         } else if (!keyd_repeat) {
 577                                 // Don't buffer repeating key if repeat mode is off
 578                                 scancode = 0xAA;
 579                         }
 580
 581                         if ( scancode!=0xAA ) {
 582                                 keycode = scancode;
 583
 584                                 if ( keyd_pressed[KEY_LSHIFT] || keyd_pressed[KEY_RSHIFT] )
 585                                         keycode |= KEY_SHIFTED;
 586
 587                                 if ( keyd_pressed[KEY_LALT] || keyd_pressed[KEY_RALT] )
 588                                         keycode |= KEY_ALTED;
 589
 590                                 if ( keyd_pressed[KEY_LCTRL] || keyd_pressed[KEY_RCTRL] )
 591                                         keycode |= KEY_CTRLED;
 592
 593 #ifndef NDEBUG
 594                                 if ( keyd_pressed[KEY_DELETE] )
 595                                         keycode |= KEY_DEBUGGED;
 596 #endif
 597
 598                                 temp = key_data.keytail+1;
 599                                 if ( temp >= KEY_BUFFER_SIZE ) temp=0;
 600
 601                                 if (temp!=key_data.keyhead)     {
 602                                         key_data.keybuffer[key_data.keytail] = keycode;
 603                                         key_data.time_pressed[key_data.keytail] = keyd_time_when_last_pressed;
 604                                         key_data.keytail = temp;
 605                                 }
 606                         }
 607                 }
 608         }
 609
 610 #ifndef NDEBUG
 611 #ifdef PASS_KEYS_TO_BIOS
 612         _chain_intr( key_data.prev_int_9 );
 613 #endif
 614 #endif
 615
 616         temp = inp(0x61);               // Get current port 61h state
 617         temp |= 0x80;                   // Turn on bit 7 to signal clear keybrd
 618         outp( 0x61, temp );     // Send to port
 619         temp &= 0x7f;                   // Turn off bit 7 to signal break
 620         outp( 0x61, temp );     // Send to port
 621         outp( 0x20, 0x20 );     // Reset interrupt controller
 622 }
 623
 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 }