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 /*
  15  * $Source: /cvs/cvsroot/d2x/arch/dos/key.c,v $
  16  * $Revision: 1.3 $
  17  * $Author: bradleyb $
  18  * $Date: 2001-10-24 09:25:05 $
  19  *
  20  * Functions for keyboard handler.
  21  *
  22  * $Log: not supported by cvs2svn $
  23  * Revision 1.3  2001/01/31 14:04:44  bradleyb
  24  * Fix compiler warnings
  25  *
  26  * Revision 1.2  2001/01/29 14:03:57  bradleyb
  27  * Fixed build, minor fixes
  28  *
  29  * Revision 1.1.1.2  2001/01/19 03:33:52  bradleyb
  30  * Import of d2x-0.0.9-pre1
  31  *
  32  * Revision 1.1.1.1  1999/06/14 21:58:32  donut
  33  * Import of d1x 1.37 source.
  34  *
  35  * Revision 1.35  1995/01/25  20:13:30  john
  36  * Took out not passing keys to debugger if w10.
  37  *
  38  * Revision 1.34  1995/01/14  19:19:31  john
  39  * Made so when you press Shift+Baskspace, it release keys autmatically.
  40  *
  41  * Revision 1.33  1994/12/13  09:21:48  john
  42  * Took out keyd_editor_mode, and KEY_DEBUGGED stuff for NDEBUG versions.
  43  *
  44  * Revision 1.32  1994/11/12  13:52:01  john
  45  * Fixed bug with code that cleared bios buffer.
  46  *
  47  * Revision 1.31  1994/10/24  15:16:16  john
  48  * Added code to detect KEY_PAUSE.
  49  *
  50  * Revision 1.30  1994/10/24  13:57:53  john
  51  * Hacked in support for pause key onto code 0x61.
  52  *
  53  * Revision 1.29  1994/10/21  15:18:13  john
  54  * *** empty log message ***
  55  *
  56  * Revision 1.28  1994/10/21  15:17:24  john
  57  * Made LSHIFT+BACKSPACE do what PrtScr used to.
  58  *
  59  * Revision 1.27  1994/09/22  16:09:18  john
  60  * Fixed some virtual memory lockdown problems with timer and
  61  * joystick.
  62  *
  63  * Revision 1.26  1994/09/15  21:32:47  john
  64  * Added bounds checking for down_count scancode
  65  * parameter.
  66  *
  67  * Revision 1.25  1994/08/31  12:22:20  john
  68  * Added KEY_DEBUGGED
  69  *
  70  * Revision 1.24  1994/08/24  18:53:48  john
  71  * Made Cyberman read like normal mouse; added dpmi module; moved
  72  * mouse from assembly to c. Made mouse buttons return time_down.
  73  *
  74  * Revision 1.23  1994/08/18  15:17:51  john
  75  * *** empty log message ***
  76  *
  77  * Revision 1.22  1994/08/18  15:16:38  john
  78  * fixed some bugs with clear_key_times and then
  79  * removed it because i fixed key_flush to do the
  80  * same.
  81  *
  82  * Revision 1.21  1994/08/17  19:01:25  john
  83  * Attempted to fix a bug with a key being held down
  84  * key_flush called, then the key released having too
  85  * long of a time.
  86  *
  87  * Revision 1.20  1994/08/08  10:43:48  john
  88  * Recorded when a key was pressed for key_inkey_time.
  89  *
  90  * Revision 1.19  1994/06/22  15:00:03  john
  91  * Made keyboard close automatically on exit.
  92  *
  93  * Revision 1.18  1994/06/21  09:16:29  john
  94  * *** empty log message ***
  95  *
  96  * Revision 1.17  1994/06/21  09:08:23  john
  97  * *** empty log message ***
  98  *
  99  * Revision 1.16  1994/06/21  09:05:01  john
 100  * *** empty log message ***
 101  *
 102  * Revision 1.15  1994/06/21  09:04:24  john
 103  * Made PrtScreen do an int5
 104  *
 105  * Revision 1.14  1994/06/17  17:17:06  john
 106  * Added keyd_time_last_key_was_pressed or something like that.
 107  *
 108  * Revision 1.13  1994/05/14  13:55:16  matt
 109  * Added #define to control key passing to bios
 110  *
 111  * Revision 1.12  1994/05/05  18:09:39  john
 112  * Took out BIOS to prevent stuck keys.
 113  *
 114  * Revision 1.11  1994/05/03  17:39:12  john
 115  * *** empty log message ***
 116  *
 117  * Revision 1.10  1994/04/29  12:14:20  john
 118  * Locked all memory used during interrupts so that program
 119  * won't hang when using virtual memory.
 120  *
 121  * Revision 1.9  1994/04/28  23:49:41  john
 122  * Made key_flush flush more keys and also did something else but i forget what.
 123  *
 124  * Revision 1.8  1994/04/22  12:52:12  john
 125  * *** empty log message ***
 126  *
 127  * Revision 1.7  1994/04/01  10:44:59  mike
 128  * Change key_getch() to call getch() if our interrupt hasn't been installed.
 129  *
 130  * Revision 1.6  1994/03/09  10:45:48  john
 131  * Neatend code a bit.
 132  *
 133  * Revision 1.5  1994/02/17  17:24:16  john
 134  * Neatened up a bit.
 135  *
 136  * Revision 1.4  1994/02/17  16:30:29  john
 137  * Put in code to pass keys when in debugger.
 138  *
 139  * Revision 1.3  1994/02/17  15:57:59  john
 140  * Made handler not chain to BIOS handler.
 141  *
 142  * Revision 1.2  1994/02/17  15:56:06  john
 143  * Initial version.
 144  *
 145  * Revision 1.1  1994/02/17  15:54:07  john
 146  * Initial revision
 147  *
 148  *
 149  */
 150
 151 //#define PASS_KEYS_TO_BIOS     1                       //if set, bios gets keys
 152
 153 #ifdef HAVE_CONFIG_H
 154 #include <conf.h>
 155 #endif
 156
 157 #include <stdlib.h>
 158 #include <stdio.h>
 159 #include <dos.h>
 160 #include <conio.h> /* for getch */
 161
 162 //#define WATCOM_10
 163 #ifdef __DJGPP__
 164 #include <dpmi.h>
 165 #define _far
 166 #define __far
 167 #define __interrupt
 168 #define near
 169 _go32_dpmi_seginfo kbd_hand_info;
 170 #endif
 171 #include "error.h"
 172 #include "key.h"
 173 #include "timer.h"
 174 #include "u_dpmi.h"
 175
 176 #define KEY_BUFFER_SIZE 16
 177
 178
 179 //-------- Variable accessed by outside functions ---------
 180 unsigned char                           keyd_buffer_type;               // 0=No buffer, 1=buffer ASCII, 2=buffer scans
 181 unsigned char                           keyd_repeat;
 182 unsigned char                           keyd_editor_mode;
 183 volatile unsigned char  keyd_last_pressed;
 184 volatile unsigned char  keyd_last_released;
 185 volatile unsigned char  keyd_pressed[256];
 186 volatile int                            keyd_time_when_last_pressed;
 187
 188 typedef struct keyboard {
 189         unsigned short          keybuffer[KEY_BUFFER_SIZE];
 190         fix                                     time_pressed[KEY_BUFFER_SIZE];
 191         fix                                     TimeKeyWentDown[256];
 192         fix                                     TimeKeyHeldDown[256];
 193         unsigned int            NumDowns[256];
 194         unsigned int            NumUps[256];
 195         unsigned int            keyhead, keytail;
 196         unsigned char           E0Flag;
 197         unsigned char           E1Flag;
 198         int                                     in_key_handler;
 199 #ifdef __DJGPP__
 200         _go32_dpmi_seginfo prev_int_9;
 201 #else
 202         void (__interrupt __far *prev_int_9)();
 203 #endif
 204 } keyboard;
 205
 206 static volatile keyboard key_data;
 207
 208 static unsigned char Installed=0;
 209
 210 unsigned char ascii_table[128] =
 211 { 255, 255, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=',255,255,
 212   'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 255, 255,
 213   'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', 39, '`',
 214   255, '\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 255,'*',
 215   255, ' ', 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255,255,
 216   255, 255, 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 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,
 219   255,255,255,255,255,255,255,255 };
 220
 221 unsigned char shifted_ascii_table[128] =
 222 { 255, 255, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',255,255,
 223   'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', 255, 255,
 224   'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',
 225   255, '|', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?', 255,255,
 226   255, ' ', 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255,255,
 227   255, 255, 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 228   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 229   255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
 230   255,255,255,255,255,255,255,255 };
 231 /*
 232 char * key_text[256] = {
 233 "","ESC","1","2","3","4","5","6","7","8","9","0","-",
 234 "=","BSPC","TAB","Q","W","E","R","T","Y","U","I","O",
 235 "P","[","]","\83","LCTRL","A","S","D","F",
 236 "G","H","J","K","L",";","'","`",
 237 "LSHFT","\\","Z","X","C","V","B","N","M",",",
 238 ".","/","RSHFT","PAD*","LALT","SPC",
 239 "CPSLK","F1","F2","F3","F4","F5","F6","F7","F8","F9",
 240 "F10","NMLCK","SCLK","PAD7","PAD8","PAD9","PAD-",
 241 "PAD4","PAD5","PAD6","PAD+","PAD1","PAD2","PAD3","PAD0",
 242 "PAD.","","","","F11","F12","","","","","","","","","",
 243 "","","","","","","","","","","","","","","","","","","","",
 244 "","","","","","","","","","","","","","","","","","","","",
 245 "","","","","","","","","","","","","","","","","","",
 246 "PAD\83","RCTRL","","","","","","","","","","","","","",
 247 "","","","","","","","","","","PAD/","","","RALT","",
 248 "","","","","","","","","","","","","","HOME","\82","PGUP",
 249 "","\81","","\7f","","END","\80","PGDN","INS",
 250 "DEL","","","","","","","","","","","","","","","","","",
 251 "","","","","","","","","","","","","","","","","","","","",
 252 "","","","","","","" };
 253 */
 254 unsigned char key_to_ascii(int keycode )
 255 {
 256         int shifted;
 257
 258         shifted = keycode & KEY_SHIFTED;
 259         keycode &= 0xFF;
 260
 261         if ( keycode>=127 )
 262                 return 255;
 263
 264         if (shifted)
 265                 return shifted_ascii_table[keycode];
 266         else
 267                 return ascii_table[keycode];
 268 }
 269
 270 void key_clear_bios_buffer_all()
 271 {
 272 #ifdef __WATCOMC__
 273         // Clear keyboard buffer...
 274         *(ushort *)0x41a=*(ushort *)0x41c;
 275         // Clear the status bits...
 276         *(ubyte *)0x417 = 0;
 277         *(ubyte *)0x418 = 0;
 278 #else
 279         _farpokew(_dos_ds,0x41a, _farpeekw(_dos_ds, 0x41c));
 280         _farpokeb(_dos_ds,0x417, 0);
 281         _farpokeb(_dos_ds,0x418, 0);
 282 #endif
 283 }
 284
 285 void key_clear_bios_buffer()
 286 {
 287 #ifdef __WATCOMC__
 288         // Clear keyboard buffer...
 289         *(ushort *)0x41a=*(ushort *)0x41c;
 290 #else
 291         _farpokew(_dos_ds,0x41a, _farpeekw(_dos_ds, 0x41c));
 292 #endif
 293 }
 294
 295 void key_flush()
 296 {
 297         int i;
 298         fix CurTime;
 299
 300         _disable();
 301
 302         // Clear the BIOS buffer
 303         key_clear_bios_buffer();
 304
 305         key_data.keyhead = key_data.keytail = 0;
 306
 307         //Clear the keyboard buffer
 308         for (i=0; i<KEY_BUFFER_SIZE; i++ )      {
 309                 key_data.keybuffer[i] = 0;
 310                 key_data.time_pressed[i] = 0;
 311         }
 312
 313         //Clear the keyboard array
 314
 315         CurTime =timer_get_fixed_secondsX();
 316
 317         for (i=0; i<256; i++ )  {
 318                 keyd_pressed[i] = 0;
 319                 key_data.TimeKeyWentDown[i] = CurTime;
 320                 key_data.TimeKeyHeldDown[i] = 0;
 321                 key_data.NumDowns[i]=0;
 322                 key_data.NumUps[i]=0;
 323         }
 324         _enable();
 325 }
 326
 327 int add_one( int n )
 328 {
 329         n++;
 330         if ( n >= KEY_BUFFER_SIZE ) n=0;
 331         return n;
 332 }
 333
 334 // Returns 1 if character waiting... 0 otherwise
 335 int key_checkch()
 336 {
 337         int is_one_waiting = 0;
 338
 339         _disable();
 340
 341         key_clear_bios_buffer();
 342
 343         if (key_data.keytail!=key_data.keyhead)
 344                 is_one_waiting = 1;
 345         _enable();
 346         return is_one_waiting;
 347 }
 348
 349 int key_inkey()
 350 {
 351         int key = 0;
 352
 353         _disable();
 354
 355         key_clear_bios_buffer();
 356
 357         if (key_data.keytail!=key_data.keyhead) {
 358                 key = key_data.keybuffer[key_data.keyhead];
 359                 key_data.keyhead = add_one(key_data.keyhead);
 360         }
 361         _enable();
 362         return key;
 363 }
 364
 365 int key_inkey_time(fix * time)
 366 {
 367         int key = 0;
 368
 369         _disable();
 370
 371         key_clear_bios_buffer();
 372
 373         if (key_data.keytail!=key_data.keyhead) {
 374                 key = key_data.keybuffer[key_data.keyhead];
 375                 *time = key_data.time_pressed[key_data.keyhead];
 376                 key_data.keyhead = add_one(key_data.keyhead);
 377         }
 378         _enable();
 379         return key;
 380 }
 381
 382
 383
 384 int key_peekkey()
 385 {
 386         int key = 0;
 387
 388         _disable();
 389
 390         key_clear_bios_buffer();
 391
 392         if (key_data.keytail!=key_data.keyhead) {
 393                 key = key_data.keybuffer[key_data.keyhead];
 394         }
 395         _enable();
 396         return key;
 397 }
 398
 399 // If not installed, uses BIOS and returns getch();
 400 //      Else returns pending key (or waits for one if none waiting).
 401 int key_getch()
 402 {
 403         int dummy=0;
 404
 405         if (!Installed)
 406                 return getch();
 407
 408         while (!key_checkch())
 409                 dummy++;
 410         return key_inkey();
 411 }
 412
 413 unsigned int key_get_shift_status()
 414 {
 415         unsigned int shift_status = 0;
 416
 417         _disable();
 418
 419         key_clear_bios_buffer();
 420
 421         if ( keyd_pressed[KEY_LSHIFT] || keyd_pressed[KEY_RSHIFT] )
 422                 shift_status |= KEY_SHIFTED;
 423
 424         if ( keyd_pressed[KEY_LALT] || keyd_pressed[KEY_RALT] )
 425                 shift_status |= KEY_ALTED;
 426
 427         if ( keyd_pressed[KEY_LCTRL] || keyd_pressed[KEY_RCTRL] )
 428                 shift_status |= KEY_CTRLED;
 429
 430 #ifndef NDEBUG
 431         if (keyd_pressed[KEY_DELETE])
 432                 shift_status |=KEY_DEBUGGED;
 433 #endif
 434
 435         _enable();
 436
 437         return shift_status;
 438 }
 439
 440 // Returns the number of seconds this key has been down since last call.
 441 fix key_down_time(int scancode) {
 442         fix time_down, time;
 443
 444         if ((scancode<0)|| (scancode>255)) return 0;
 445
 446 #ifndef NDEBUG
 447         if (keyd_editor_mode && key_get_shift_status() )
 448                 return 0;
 449 #endif
 450
 451         _disable();
 452
 453         if ( !keyd_pressed[scancode] )  {
 454                 time_down = key_data.TimeKeyHeldDown[scancode];
 455                 key_data.TimeKeyHeldDown[scancode] = 0;
 456         } else  {
 457                 time = timer_get_fixed_secondsX();
 458                 time_down =  time - key_data.TimeKeyWentDown[scancode];
 459                 key_data.TimeKeyWentDown[scancode] = time;
 460         }
 461         _enable();
 462
 463         return time_down;
 464 }
 465
 466 // Returns number of times key has went from up to down since last call.
 467 unsigned int key_down_count(int scancode)       {
 468         int n;
 469
 470         if ((scancode<0)|| (scancode>255)) return 0;
 471
 472         _disable();
 473         n = key_data.NumDowns[scancode];
 474         key_data.NumDowns[scancode] = 0;
 475         _enable();
 476
 477         return n;
 478 }
 479
 480
 481 // Returns number of times key has went from down to up since last call.
 482 unsigned int key_up_count(int scancode) {
 483         int n;
 484
 485         if ((scancode<0)|| (scancode>255)) return 0;
 486
 487         _disable();
 488         n = key_data.NumUps[scancode];
 489         key_data.NumUps[scancode] = 0;
 490         _enable();
 491
 492         return n;
 493 }
 494
 495 // Use intrinsic forms so that we stay in the locked interrup code.
 496
 497 #ifdef __WATCOMC__
 498 void Int5();
 499 #pragma aux Int5 = "int 5";
 500 #else
 501 #ifdef __GNUC__
 502 #define Int5() asm volatile("int $5")
 503 #endif
 504 #endif
 505
 506 void __interrupt __far key_handler()
 507 {
 508         unsigned char scancode, breakbit, temp;
 509         unsigned short keycode;
 510
 511 #ifndef WATCOM_10
 512 #ifndef NDEBUG
 513 #ifdef __WATCOMC__ /* must have _chain_intr */
 514         ubyte * MONO = (ubyte *)(0x0b0000+24*80*2);
 515         if (  ((MONO[0]=='D') && (MONO[2]=='B') && (MONO[4]=='G') && (MONO[6]=='>')) ||
 516                         ((MONO[14]=='<') && (MONO[16]=='i') && (MONO[18]=='>') && (MONO[20]==' ') && (MONO[22]=='-')) ||
 517                         ((MONO[0]==200 ) && (MONO[2]==27) && (MONO[4]==17) )
 518                 )
 519                 _chain_intr( key_data.prev_int_9 );
 520 #endif
 521 #endif
 522 #endif
 523
 524         // Read in scancode
 525         scancode = inp( 0x60 );
 526
 527         switch( scancode )      {
 528         case 0xE0:
 529                 key_data.E0Flag = 0x80;
 530                 break;
 531         default:
 532                 // Parse scancode and break bit
 533                 if (key_data.E1Flag > 0 )       {               // Special code for Pause, which is E1 1D 45 E1 9D C5
 534                         key_data.E1Flag--;
 535                         if ( scancode == 0x1D ) {
 536                                 scancode        = KEY_PAUSE;
 537                                 breakbit        = 0;
 538                         } else if ( scancode == 0x9d ) {
 539                                 scancode        = KEY_PAUSE;
 540                                 breakbit        = 1;
 541                         } else {
 542                                 break;          // skip this keycode
 543                         }
 544                 } else if ( scancode==0xE1 )    {
 545                         key_data.E1Flag = 2;
 546                         break;
 547                 } else {
 548                         breakbit        = scancode & 0x80;              // Get make/break bit
 549                         scancode &= 0x7f;                                               // Strip make/break bit off of scancode
 550                         scancode |= key_data.E0Flag;                                    // Add in extended key code
 551                 }
 552                 key_data.E0Flag = 0;                                                            // Clear extended key code
 553
 554                 if (breakbit)   {
 555                         // Key going up
 556                         keyd_last_released = scancode;
 557                         keyd_pressed[scancode] = 0;
 558                         key_data.NumUps[scancode]++;
 559                         temp = 0;
 560                         temp |= keyd_pressed[KEY_LSHIFT] || keyd_pressed[KEY_RSHIFT];
 561                         temp |= keyd_pressed[KEY_LALT] || keyd_pressed[KEY_RALT];
 562                         temp |= keyd_pressed[KEY_LCTRL] || keyd_pressed[KEY_RCTRL];
 563 #ifndef NDEBUG
 564                         temp |= keyd_pressed[KEY_DELETE];
 565                         if ( !(keyd_editor_mode && temp) )
 566 #endif          // NOTICE LINK TO ABOVE IF!!!!
 567                                 key_data.TimeKeyHeldDown[scancode] += timer_get_fixed_secondsX() - key_data.TimeKeyWentDown[scancode];
 568                 } else {
 569                         // Key going down
 570                         keyd_last_pressed = scancode;
 571                         keyd_time_when_last_pressed = timer_get_fixed_secondsX();
 572                         if (!keyd_pressed[scancode])    {
 573                                 // First time down
 574                                 key_data.TimeKeyWentDown[scancode] = timer_get_fixed_secondsX();
 575                                 keyd_pressed[scancode] = 1;
 576                                 key_data.NumDowns[scancode]++;
 577 #ifndef NDEBUG
 578                                 if ( (keyd_pressed[KEY_LSHIFT]) && (scancode == KEY_BACKSP) )   {
 579                                         keyd_pressed[KEY_LSHIFT] = 0;
 580                                         Int5();
 581                                 }
 582 #endif
 583                         } else if (!keyd_repeat) {
 584                                 // Don't buffer repeating key if repeat mode is off
 585                                 scancode = 0xAA;
 586                         }
 587
 588                         if ( scancode!=0xAA ) {
 589                                 keycode = scancode;
 590
 591                                 if ( keyd_pressed[KEY_LSHIFT] || keyd_pressed[KEY_RSHIFT] )
 592                                         keycode |= KEY_SHIFTED;
 593
 594                                 if ( keyd_pressed[KEY_LALT] || keyd_pressed[KEY_RALT] )
 595                                         keycode |= KEY_ALTED;
 596
 597                                 if ( keyd_pressed[KEY_LCTRL] || keyd_pressed[KEY_RCTRL] )
 598                                         keycode |= KEY_CTRLED;
 599
 600 #ifndef NDEBUG
 601                                 if ( keyd_pressed[KEY_DELETE] )
 602                                         keycode |= KEY_DEBUGGED;
 603 #endif
 604
 605                                 temp = key_data.keytail+1;
 606                                 if ( temp >= KEY_BUFFER_SIZE ) temp=0;
 607
 608                                 if (temp!=key_data.keyhead)     {
 609                                         key_data.keybuffer[key_data.keytail] = keycode;
 610                                         key_data.time_pressed[key_data.keytail] = keyd_time_when_last_pressed;
 611                                         key_data.keytail = temp;
 612                                 }
 613                         }
 614                 }
 615         }
 616
 617 #ifndef NDEBUG
 618 #ifdef PASS_KEYS_TO_BIOS
 619         _chain_intr( key_data.prev_int_9 );
 620 #endif
 621 #endif
 622
 623         temp = inp(0x61);               // Get current port 61h state
 624         temp |= 0x80;                   // Turn on bit 7 to signal clear keybrd
 625         outp( 0x61, temp );     // Send to port
 626         temp &= 0x7f;                   // Turn off bit 7 to signal break
 627         outp( 0x61, temp );     // Send to port
 628         outp( 0x20, 0x20 );     // Reset interrupt controller
 629 }
 630
 631
 632 void key_handler_end()  {               // Dummy function to help calculate size of keyboard handler function
 633 }
 634
 635 void key_init()
 636 {
 637         // Initialize queue
 638
 639         keyd_time_when_last_pressed = timer_get_fixed_seconds();
 640         keyd_buffer_type = 1;
 641         keyd_repeat = 1;
 642         key_data.in_key_handler = 0;
 643         key_data.E0Flag = 0;
 644         key_data.E1Flag = 0;
 645
 646         // Clear the keyboard array
 647         key_flush();
 648
 649         if (Installed) return;
 650         Installed = 1;
 651
 652         //--------------- lock everything for the virtal memory ----------------------------------
 653         if (!dpmi_lock_region ((void near *)key_handler, (char *)key_handler_end - (char near *)key_handler))   {
 654                 printf( "Error locking keyboard handler!\n" );
 655                 exit(1);
 656         }
 657         if (!dpmi_lock_region ((void *)&key_data, sizeof(keyboard)))    {
 658                 printf( "Error locking keyboard handler's data1!\n" );
 659                 exit(1);
 660         }
 661         if (!dpmi_lock_region (&keyd_buffer_type, sizeof(char)))        {
 662                 printf( "Error locking keyboard handler's data2!\n" );
 663                 exit(1);
 664         }
 665         if (!dpmi_lock_region (&keyd_repeat, sizeof(char)))     {
 666                 printf( "Error locking keyboard handler's data3!\n" );
 667                 exit(1);
 668         }
 669         if (!dpmi_lock_region (&keyd_editor_mode, sizeof(char)))        {
 670                 printf( "Error locking keyboard handler's data4!\n" );
 671                 exit(1);
 672         }
 673         if (!dpmi_lock_region ((void *)&keyd_last_pressed, sizeof(char)))       {
 674                 printf( "Error locking keyboard handler's data5!\n" );
 675                 exit(1);
 676         }
 677         if (!dpmi_lock_region ((void *)&keyd_last_released, sizeof(char)))      {
 678                 printf( "Error locking keyboard handler's data6!\n" );
 679                 exit(1);
 680         }
 681         if (!dpmi_lock_region ((void *)&keyd_pressed, sizeof(char)*256))        {
 682                 printf( "Error locking keyboard handler's data7!\n" );
 683                 exit(1);
 684         }
 685         if (!dpmi_lock_region ((void *)&keyd_time_when_last_pressed, sizeof(int)))      {
 686                 printf( "Error locking keyboard handler's data8!\n" );
 687                 exit(1);
 688         }
 689
 690 #ifndef __DJGPP__
 691         key_data.prev_int_9 = (void *)_dos_getvect( 9 );
 692     _dos_setvect( 9, key_handler );
 693 #else
 694         _go32_dpmi_get_protected_mode_interrupt_vector(9,
 695          (_go32_dpmi_seginfo *)&key_data.prev_int_9);
 696         kbd_hand_info.pm_offset = (int)key_handler;
 697         kbd_hand_info.pm_selector = _my_cs();
 698         _go32_dpmi_allocate_iret_wrapper(&kbd_hand_info);
 699         _go32_dpmi_set_protected_mode_interrupt_vector(9, &kbd_hand_info);
 700 #endif
 701
 702         atexit( key_close );
 703 }
 704
 705 void key_close()
 706 {
 707         if (!Installed) return;
 708         Installed = 0;
 709
 710 #ifndef __DJGPP__
 711         _dos_setvect( 9, key_data.prev_int_9 );
 712 #else
 713         _go32_dpmi_set_protected_mode_interrupt_vector(9,
 714          (_go32_dpmi_seginfo *)&key_data.prev_int_9);
 715 #endif
 716
 717         _disable();
 718         key_clear_bios_buffer_all();
 719         _enable();
 720
 721 }