src/lib/16_mm.c

   1 /* Catacomb Armageddon Source Code
   2  * Copyright (C) 1993-2014 Flat Rock Software
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 // NEWMM.C
  20
  21 /*
  22 =============================================================================
  23
  24                         ID software memory manager
  25                         --------------------------
  26
  27 Primary coder: John Carmack
  28
  29 RELIES ON
  30 ---------
  31 Quit (char *error) function
  32
  33
  34 WORK TO DO
  35 ----------
  36 MM_SizePtr to change the size of a given pointer
  37
  38 Multiple purge levels utilized
  39
  40 EMS / XMS unmanaged routines
  41
  42 =============================================================================
  43 */
  44
  45 #include "src/lib/16_mm.h"
  46
  47 /*
  48 ======================
  49 =
  50 = MML_CheckForEMS
  51 =
  52 = Routine from p36 of Extending DOS
  53 =
  54 =======================
  55 */
  56
  57 boolean MML_CheckForEMS (void)
  58 {
  59         boolean emmcfems;
  60         char    emmname[] = "EMMXXXX0";
  61 //              mov     dx,OFFSET emmname
  62         __asm {
  63                 LEA     DX, emmname     //fix by andrius4669
  64                 mov     ax,0x3d00
  65                 int     0x21            // try to open EMMXXXX0 device
  66                 jc      error
  67
  68                 mov     bx,ax
  69                 mov     ax,0x4400
  70
  71                 int     0x21            // get device info
  72                 jc      error
  73
  74                 and     dx,0x80
  75                 jz      error
  76
  77                 mov     ax,0x4407
  78
  79                 int     0x21            // get status
  80                 jc      error
  81                 or      al,al
  82                 jz      error
  83
  84                 mov     ah,0x3e
  85                 int     0x21            // close handle
  86                 jc      error
  87                 //
  88                 // EMS is good
  89                 //
  90                 mov     emmcfems,1
  91                 jmp End
  92                 error:
  93                 //
  94                 // EMS is bad
  95                 //
  96                 mov     emmcfems,0
  97                 End:
  98         }
  99         return(emmcfems);
 100 }
 101
 102
 103 /*
 104 ======================
 105 =
 106 = MML_SetupEMS
 107 =
 108 =======================
 109 */
 110
 111 void MML_SetupEMS (void)
 112 {
 113         char    str[80],str2[10];
 114         unsigned        err;
 115         boolean errorflag=false;
 116         union REGS CPURegs;
 117
 118         EMSVer = 0;
 119         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 120
 121         __asm
 122                 {
 123                 mov     ah,EMS_STATUS
 124                 int     EMS_INT                                         // make sure EMS hardware is present
 125                 or      ah,ah
 126                 jnz     error
 127
 128                 mov     ah,EMS_VERSION
 129                 int     EMS_INT
 130                 or      ah,ah
 131                 jnz     error
 132                 mov     [EMSVer],ax                             //      set EMSVer
 133                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 134                 jb      error
 135
 136                 mov     ah,EMS_GETFRAME
 137                 int     EMS_INT                                         // find the page frame address
 138                 or      ah,ah
 139                 jnz     error
 140                 mov     [EMSpageframe],bx
 141
 142                 mov     ah,EMS_GETPAGES
 143                 int     EMS_INT                                         // find out how much EMS is there
 144                 or      ah,ah
 145                 jnz     error
 146                 mov     [totalEMSpages],dx
 147                 mov     [freeEMSpages],bx
 148                 or      bx,bx
 149                 jz      noEMS                                           // no EMS at all to allocate
 150
 151                 cmp     bx,4
 152                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 153                 mov     bx,4                                            // we can't use more than 4 pages
 154
 155 getpages:
 156                 mov     [EMSpagesmapped],bx
 157                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 158                 int     EMS_INT
 159                 or      ah,ah
 160                 jnz     error
 161                 mov     [EMShandle],dx
 162                 jmp End
 163 error:
 164                 mov     errorflag,1
 165                 jmp End
 166 noEMS:
 167 End:
 168         }
 169         if(errorflag==true)
 170         {
 171                 err = CPURegs.h.ah;
 172                 strcpy(str,"MML_SetupEMS: EMS error 0x");
 173                 itoa(err,str2,16);
 174                 strcpy(str,str2);
 175                 printf("%s\n",str);
 176         }
 177 }
 178
 179
 180 /*
 181 ======================
 182 =
 183 = MML_ShutdownEMS
 184 =
 185 =======================
 186 */
 187
 188 void MML_ShutdownEMS (void)
 189 {
 190         boolean errorflag=false;
 191         if (!EMShandle)
 192                 return;
 193         __asm
 194         {
 195                 mov     ah,EMS_FREEPAGES
 196                 mov     dx,[EMShandle]
 197                 int     EMS_INT
 198                 or      ah,ah
 199                 jz      ok
 200                 mov     errorflag,1
 201                 ok:
 202         }
 203         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!");      //++++ add something
 204 }
 205
 206 /*
 207 ====================
 208 =
 209 = MM_MapEMS
 210 =
 211 = Maps the 64k of EMS used by memory manager into the page frame
 212 = for general use.  This only needs to be called if you are keeping
 213 = other things in EMS.
 214 =
 215 ====================
 216 */
 217
 218 void MM_MapEMS (void)
 219 {
 220         char    str[80],str2[10];
 221         unsigned        err;
 222         boolean errorflag=false;
 223         int     i;
 224         union REGS CPURegs;
 225
 226         for (i=0;i<EMSpagesmapped;i++)
 227         {
 228                 __asm
 229                 {
 230                         mov     ah,EMS_MAPPAGE
 231                         mov     bx,[i]                  // logical page
 232                         mov     al,bl                   // physical page
 233                         mov     dx,[EMShandle]  // handle
 234                         int     EMS_INT
 235                         or      ah,ah
 236                         jnz     error
 237                         jmp End
 238                         error:
 239                         mov     errorflag,1
 240                         End:
 241                 }
 242                 if(errorflag==true)
 243                 {
 244                         err = CPURegs.h.ah;
 245                         strcpy(str,"MM_MapEMS: EMS error 0x");
 246                         itoa(err,str2,16);
 247                         strcpy(str,str2);
 248                         printf("%s\n",str);
 249                 }
 250         }
 251         return;
 252 }
 253
 254 //==========================================================================
 255
 256 /*
 257 ======================
 258 =
 259 = MML_CheckForXMS
 260 =
 261 = Check for XMM driver
 262 =
 263 =======================
 264 */
 265
 266 boolean MML_CheckForXMS (void)
 267 {
 268         boolean errorflag=false;
 269         numUMBs = 0;
 270
 271         __asm
 272         {
 273                 mov     ax,0x4300
 274                 int     0x2f                            // query status of installed diver
 275                 cmp     al,0x80
 276                 je      good
 277                 mov     errorflag,1
 278                 good:
 279         }
 280         if(errorflag==true) return false;
 281         else return true;
 282 }
 283
 284
 285 /*
 286 ======================
 287 =
 288 = MML_SetupXMS
 289 =
 290 = Try to allocate all upper memory block
 291 =
 292 =======================
 293 */
 294
 295 void MML_SetupXMS (void)
 296 {
 297         unsigned        base,size;
 298
 299         __asm
 300         {
 301                 mov     ax,0x4310
 302                 int     0x2f
 303                 mov     [WORD PTR XMSaddr],bx
 304                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 305         }
 306 getmemory:
 307         __asm
 308         {
 309                 mov     ah,XMS_ALLOCUMB
 310                 mov     dx,0xffff                                       // try for largest block possible
 311                 call    [DWORD PTR XMSaddr]
 312                 or      ax,ax
 313                 jnz     gotone
 314
 315                 cmp     bl,0xb0                                         // error: smaller UMB is available
 316                 jne     done;
 317
 318                 mov     ah,XMS_ALLOCUMB
 319                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 320                 or      ax,ax
 321                 jz      done                                            // another error...
 322
 323 gotone:
 324                 mov     [base],bx
 325                 mov     [size],dx
 326 done:
 327         }
 328         MML_UseSpace (base,size);
 329         mminfo.XMSmem += size*16;
 330         UMBbase[numUMBs] = base;
 331         numUMBs++;
 332         if (numUMBs < MAXUMBS)
 333                 goto getmemory;
 334 }
 335
 336
 337 /*
 338 ======================
 339 =
 340 = MML_ShutdownXMS
 341 =
 342 ======================
 343 */
 344
 345 void MML_ShutdownXMS (void)
 346 {
 347         int     i;
 348         unsigned        base;
 349
 350         for (i=0;i<numUMBs;i++)
 351         {
 352                 base = UMBbase[i];
 353                 __asm
 354                 {
 355                         mov     ah,XMS_FREEUMB
 356                         mov     dx,[base]
 357                         call    [DWORD PTR XMSaddr]
 358                 }
 359         }
 360 }
 361
 362 //==========================================================================
 363
 364 /*
 365 ======================
 366 =
 367 = MML_UseSpace
 368 =
 369 = Marks a range of paragraphs as usable by the memory manager
 370 = This is used to mark space for the near heap, far heap, ems page frame,
 371 = and upper memory blocks
 372 =
 373 ======================
 374 */
 375
 376 void MML_UseSpace (unsigned segstart, unsigned seglength)
 377 {
 378         mmblocktype far *scan,far *last;
 379         unsigned        oldend;
 380         long            extra;
 381
 382         scan = last = mmhead;
 383         mmrover = mmhead;               // reset rover to start of memory
 384
 385 //
 386 // search for the block that contains the range of segments
 387 //
 388         while (scan->start+scan->length < segstart)
 389         {
 390                 last = scan;
 391                 scan = scan->next;
 392         }
 393
 394 //
 395 // take the given range out of the block
 396 //
 397         oldend = scan->start + scan->length;
 398         extra = oldend - (segstart+seglength);
 399         if (extra < 0)
 400         {
 401                 printf("MML_UseSpace: Segment spans two blocks!");
 402                 return;
 403         }
 404
 405
 406         if (segstart == scan->start)
 407         {
 408                 last->next = scan->next;                        // unlink block
 409                 FREEBLOCK(scan);
 410                 scan = last;
 411         }
 412         else
 413                 scan->length = segstart-scan->start;    // shorten block
 414
 415         if (extra > 0)
 416         {
 417                 GETNEWBLOCK;
 418                 mmnew->next = scan->next;
 419                 scan->next = mmnew;
 420                 mmnew->start = segstart+seglength;
 421                 mmnew->length = extra;
 422                 mmnew->attributes = LOCKBIT;
 423         }
 424
 425 }
 426
 427 //==========================================================================
 428
 429 /*
 430 ====================
 431 =
 432 = MML_ClearBlock
 433 =
 434 = We are out of blocks, so free a purgable block
 435 =
 436 ====================
 437 */
 438
 439 void MML_ClearBlock (void)
 440 {
 441         mmblocktype far *scan,far *last;
 442
 443         scan = mmhead->next;
 444
 445         while (scan)
 446         {
 447                 if (!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS) )
 448                 {
 449                         MM_FreePtr(scan->useptr);
 450                         return;
 451                 }
 452                 scan = scan->next;
 453         }
 454
 455         printf("MM_ClearBlock: No purgable blocks!");
 456 }
 457
 458
 459 //==========================================================================
 460
 461 /*
 462 ===================
 463 =
 464 = MM_Startup
 465 =
 466 = Grabs all space from turbo with malloc/farmalloc
 467 = Allocates bufferseg misc buffer
 468 =
 469 ===================
 470 */
 471
 472 void MM_Startup (void)
 473 {
 474         int i;
 475         dword length;
 476         void far        *start;
 477         unsigned        segstart,seglength,endfree;
 478
 479         if (mmstarted)
 480                 MM_Shutdown ();
 481
 482
 483         mmstarted = true;
 484         bombonerror = true;
 485 //
 486 // set up the linked list (everything in the free list;
 487 //
 488         mmhead = NULL;
 489         mmfree = &mmblocks[0];
 490         for (i=0;i<MAXBLOCKS-1;i++)
 491                 mmblocks[i].next = &mmblocks[i+1];
 492         mmblocks[i].next = NULL;
 493
 494 //
 495 // locked block of all memory until we punch out free space
 496 //
 497         GETNEWBLOCK;
 498         mmhead = mmnew;                         // this will allways be the first node
 499         mmnew->start = 0;
 500         mmnew->length = 0xffff;
 501         mmnew->attributes = LOCKBIT;
 502         mmnew->next = NULL;
 503         mmrover = mmhead;
 504
 505
 506 //
 507 // get all available near conventional memory segments
 508 //
 509 //----  length=coreleft();
 510         length=_memavl();
 511         start = (void far *)(nearheap = malloc(length));
 512
 513         length -= 16-(FP_OFF(start)&15);
 514         length -= SAVENEARHEAP;
 515         seglength = length / 16;                        // now in paragraphs
 516         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 517         MML_UseSpace (segstart,seglength);
 518         mminfo.nearheap = length;
 519
 520 //
 521 // get all available far conventional memory segments
 522 //
 523 //----  length=farcoreleft();
 524         length=_memmax();
 525         start = farheap = _fmalloc(length);
 526         length -= 16-(FP_OFF(start)&15);
 527         length -= SAVEFARHEAP;
 528         seglength = length / 16;                        // now in paragraphs
 529         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 530         MML_UseSpace (segstart,seglength);
 531         mminfo.farheap = length;
 532         mminfo.mainmem = mminfo.nearheap + mminfo.farheap;
 533
 534
 535 //
 536 // detect EMS and allocate up to 64K at page frame
 537 //
 538         mminfo.EMSmem = 0;
 539         for (i = 1;i < __argc;i++)
 540         {
 541                 if ( US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 542                         goto emsskip;                           // param NOEMS
 543         }
 544
 545         if (MML_CheckForEMS())
 546         {
 547                 //printf("EMS1\n");
 548                 MML_SetupEMS();                                 // allocate space
 549                 //printf("EMS2\n");
 550                 MML_UseSpace (EMSpageframe,EMSpagesmapped*0x400);
 551                 //printf("EMS3\n");
 552                 MM_MapEMS();                                    // map in used pages
 553                 //printf("EMS4\n");
 554                 mminfo.EMSmem = EMSpagesmapped*0x4000l;
 555         }
 556
 557 //
 558 // detect XMS and get upper memory blocks
 559 //
 560 emsskip:
 561         mminfo.XMSmem = 0;
 562         for (i = 1;i < __argc;i++)
 563         {
 564                 if ( US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 565                         goto xmsskip;                           // param NOXMS
 566         }
 567
 568         if (MML_CheckForXMS())
 569         {
 570 //              printf("XMS!\n");
 571                 MML_SetupXMS();                                 // allocate as many UMBs as possible
 572         }
 573
 574 //
 575 // allocate the misc buffer
 576 //
 577 xmsskip:
 578         mmrover = mmhead;               // start looking for space after low block
 579
 580         MM_GetPtr (&bufferseg,BUFFERSIZE);
 581 }
 582
 583 //==========================================================================
 584
 585 /*
 586 ====================
 587 =
 588 = MM_Shutdown
 589 =
 590 = Frees all conventional, EMS, and XMS allocated
 591 =
 592 ====================
 593 */
 594
 595 void MM_Shutdown (void)
 596 {
 597   if (!mmstarted)
 598         return;
 599
 600   _ffree (farheap);
 601   free (nearheap);
 602   hfree(hugeheap);
 603   MML_ShutdownEMS ();
 604   MML_ShutdownXMS ();
 605 }
 606
 607 //==========================================================================
 608
 609 /*
 610 ====================
 611 =
 612 = MM_GetPtr
 613 =
 614 = Allocates an unlocked, unpurgable block
 615 =
 616 ====================
 617 */
 618
 619 void MM_GetPtr (memptr *baseptr,dword size)
 620 {
 621         mmblocktype far *scan,far *lastscan,far *endscan
 622                                 ,far *purge,far *next;
 623         int                     search;
 624         unsigned        needed,startseg;
 625
 626         needed = (size+15)/16;          // convert size from bytes to paragraphs
 627
 628         GETNEWBLOCK;                            // fill in start and next after a spot is found
 629         mmnew->length = needed;
 630         mmnew->useptr = baseptr;
 631         mmnew->attributes = BASEATTRIBUTES;
 632
 633         for (search = 0; search<3; search++)
 634         {
 635         //
 636         // first search:        try to allocate right after the rover, then on up
 637         // second search:       search from the head pointer up to the rover
 638         // third search:        compress memory, then scan from start
 639                 if (search == 1 && mmrover == mmhead)
 640                         search++;
 641
 642                 switch (search)
 643                 {
 644                 case 0:
 645                         lastscan = mmrover;
 646                         scan = mmrover->next;
 647                         endscan = NULL;
 648                         break;
 649                 case 1:
 650                         lastscan = mmhead;
 651                         scan = mmhead->next;
 652                         endscan = mmrover;
 653                         break;
 654                 case 2:
 655                         MM_SortMem ();
 656                         lastscan = mmhead;
 657                         scan = mmhead->next;
 658                         endscan = NULL;
 659                         break;
 660                 }
 661
 662                 startseg = lastscan->start + lastscan->length;
 663
 664                 while (scan != endscan)
 665                 {
 666                         if (scan->start - startseg >= needed)
 667                         {
 668                         //
 669                         // got enough space between the end of lastscan and
 670                         // the start of scan, so throw out anything in the middle
 671                         // and allocate the new block
 672                         //
 673                                 purge = lastscan->next;
 674                                 lastscan->next = mmnew;
 675                                 mmnew->start = *(unsigned *)baseptr = startseg;
 676                                 mmnew->next = scan;
 677                                 while ( purge != scan)
 678                                 {       // free the purgable block
 679                                         next = purge->next;
 680                                         FREEBLOCK(purge);
 681                                         purge = next;           // purge another if not at scan
 682                                 }
 683                                 mmrover = mmnew;
 684                                 return; // good allocation!
 685                         }
 686
 687                         //
 688                         // if this block is purge level zero or locked, skip past it
 689                         //
 690                         if ( (scan->attributes & LOCKBIT)
 691                                 || !(scan->attributes & PURGEBITS) )
 692                         {
 693                                 lastscan = scan;
 694                                 startseg = lastscan->start + lastscan->length;
 695                         }
 696
 697
 698                         scan=scan->next;                // look at next line
 699                 }
 700         }
 701
 702         if (bombonerror)
 703                 printf(OUT_OF_MEM_MSG,(size-mminfo.nearheap));
 704         else
 705                 mmerror = true;
 706 }
 707
 708 //==========================================================================
 709
 710 /*
 711 ====================
 712 =
 713 = MM_FreePtr
 714 =
 715 = Allocates an unlocked, unpurgable block
 716 =
 717 ====================
 718 */
 719
 720 void MM_FreePtr (memptr *baseptr)
 721 {
 722         mmblocktype far *scan,far *last;
 723
 724         last = mmhead;
 725         scan = last->next;
 726
 727         if (baseptr == mmrover->useptr) // removed the last allocated block
 728                 mmrover = mmhead;
 729
 730         while (scan->useptr != baseptr && scan)
 731         {
 732                 last = scan;
 733                 scan = scan->next;
 734         }
 735
 736         if (!scan)
 737         {
 738                 printf("MM_FreePtr: Block not found!");
 739                 return;
 740         }
 741
 742         last->next = scan->next;
 743
 744         FREEBLOCK(scan);
 745 }
 746 //==========================================================================
 747
 748 /*
 749 =====================
 750 =
 751 = MM_SetPurge
 752 =
 753 = Sets the purge level for a block (locked blocks cannot be made purgable)
 754 =
 755 =====================
 756 */
 757
 758 void MM_SetPurge (memptr *baseptr, int purge)
 759 {
 760         mmblocktype far *start;
 761
 762         start = mmrover;
 763
 764         do
 765         {
 766                 if (mmrover->useptr == baseptr)
 767                         break;
 768
 769                 mmrover = mmrover->next;
 770
 771                 if (!mmrover)
 772                         mmrover = mmhead;
 773                 else if (mmrover == start)
 774                 {
 775                         printf("MM_SetPurge: Block not found!");
 776                         return;
 777                 }
 778
 779         } while (1);
 780
 781         mmrover->attributes &= ~PURGEBITS;
 782         mmrover->attributes |= purge;
 783 }
 784
 785 //==========================================================================
 786
 787 /*
 788 =====================
 789 =
 790 = MM_SetLock
 791 =
 792 = Locks / unlocks the block
 793 =
 794 =====================
 795 */
 796
 797 void MM_SetLock (memptr *baseptr, boolean locked)
 798 {
 799         mmblocktype far *start;
 800
 801         start = mmrover;
 802
 803         do
 804         {
 805                 if (mmrover->useptr == baseptr)
 806                         break;
 807
 808                 mmrover = mmrover->next;
 809
 810                 if (!mmrover)
 811                         mmrover = mmhead;
 812                 else if (mmrover == start)
 813                 {
 814                         printf("MM_SetLock: Block not found!");
 815                         return;
 816                 }
 817
 818         } while (1);
 819
 820         mmrover->attributes &= ~LOCKBIT;
 821         mmrover->attributes |= locked*LOCKBIT;
 822 }
 823
 824 //==========================================================================
 825
 826 /*
 827 =====================
 828 =
 829 = MM_SortMem
 830 =
 831 = Throws out all purgable stuff and compresses movable blocks
 832 =
 833 =====================
 834 */
 835
 836 void MM_SortMem (void)
 837 {
 838         mmblocktype far *scan,far *last,far *next;
 839         unsigned        start,length,source,dest,oldborder;
 840         int                     playing;
 841
 842         //
 843         // lock down a currently playing sound
 844         //
 845 /*++++  playing = SD_SoundPlaying ();
 846         if (playing)
 847         {
 848                 switch (SoundMode)
 849                 {
 850                 case sdm_PC:
 851                         playing += STARTPCSOUNDS;
 852                         break;
 853                 case sdm_AdLib:
 854                         playing += STARTADLIBSOUNDS;
 855                         break;
 856                 }
 857                 MM_SetLock(&(memptr)audiosegs[playing],true);
 858         }
 859
 860
 861         SD_StopSound();*/
 862 //      oldborder = bordercolor;
 863 //      VW_ColorBorder (15);
 864
 865         if (beforesort)
 866                 beforesort();
 867
 868         scan = mmhead;
 869
 870         last = NULL;            // shut up compiler warning
 871
 872         while (scan)
 873         {
 874                 if (scan->attributes & LOCKBIT)
 875                 {
 876                 //
 877                 // block is locked, so try to pile later blocks right after it
 878                 //
 879                         start = scan->start + scan->length;
 880                 }
 881                 else
 882                 {
 883                         if (scan->attributes & PURGEBITS)
 884                         {
 885                         //
 886                         // throw out the purgable block
 887                         //
 888                                 next = scan->next;
 889                                 FREEBLOCK(scan);
 890                                 last->next = next;
 891                                 scan = next;
 892                                 continue;
 893                         }
 894                         else
 895                         {
 896                         //
 897                         // push the non purgable block on top of the last moved block
 898                         //
 899                                 if (scan->start != start)
 900                                 {
 901                                         length = scan->length;
 902                                         source = scan->start;
 903                                         dest = start;
 904                                         while (length > 0xf00)
 905                                         {
 906                                                 movedata(source,0,dest,0,0xf00*16);
 907                                                 length -= 0xf00;
 908                                                 source += 0xf00;
 909                                                 dest += 0xf00;
 910                                         }
 911                                         movedata(source,0,dest,0,length*16);
 912
 913                                         scan->start = start;
 914                                         *(unsigned *)scan->useptr = start;
 915                                 }
 916                                 start = scan->start + scan->length;
 917                         }
 918                 }
 919
 920                 last = scan;
 921                 scan = scan->next;              // go to next block
 922         }
 923
 924         mmrover = mmhead;
 925
 926         if (aftersort)
 927                 aftersort();
 928
 929 //      VW_ColorBorder (oldborder);
 930
 931 /*++++  if (playing)
 932                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
 933 }
 934
 935
 936 //==========================================================================
 937
 938 //****#if 0
 939 /*
 940 =====================
 941 =
 942 = MM_ShowMemory
 943 =
 944 =====================
 945 */
 946
 947 void MM_ShowMemory (void)
 948 {
 949         mmblocktype far *scan;
 950         unsigned color,temp;//, i;
 951         long    end,owner;
 952         char    scratch[80],str[10];
 953
 954 //****  VW_SetDefaultColors();
 955 //****  VW_SetLineWidth(40);
 956 //++++mh        temp = bufferofs;
 957 //++++mh        bufferofs = 0;
 958 //****  VW_SetScreen (0,0);
 959
 960         scan = mmhead;
 961
 962         end = -1;
 963
 964 //CA_OpenDebug ();
 965
 966         while (scan)
 967         {
 968                 if (scan->attributes & PURGEBITS)
 969                         color = 5;              // dark purple = purgable
 970                 else
 971                         color = 9;              // medium blue = non purgable
 972                 if (scan->attributes & LOCKBIT)
 973                         color = 12;             // red = locked
 974                 if (scan->start<=end)
 975                 {
 976                         printf("MM_ShowMemory: Memory block order currupted!");
 977                         return;
 978                 }
 979                 end = scan->start+scan->length-1;
 980 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
 981 //++++          VW_Plot(scan->start,0,15);
 982                 if (scan->next->start > end+1)
 983 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
 984
 985 //****#if 0
 986 printf("Location:");
 987 printf("%Fp\t", scan->start);
 988 strcpy (scratch,"Size:");
 989 ltoa ((long)scan->length*16,str,10);
 990 strcat (scratch,str);
 991 strcat (scratch,"\tOwner:0x");
 992 owner = (unsigned)scan->useptr;
 993 ultoa (owner,str,16);
 994 strcat (scratch,str);
 995 strcat (scratch,"\n");
 996 //++++write (debughandle,scratch,strlen(scratch));
 997 fprintf(stdout, "%s", scratch);
 998 //****#endif
 999
1000                 scan = scan->next;
1001         }
1002
1003 //CA_CloseDebug ();
1004
1005 //++++mh        IN_Ack();
1006 //****  VW_SetLineWidth(64);
1007 //++++mh        bufferofs = temp;
1008 }
1009 //****#endif
1010
1011 //==========================================================================
1012
1013
1014 /*
1015 ======================
1016 =
1017 = MM_UnusedMemory
1018 =
1019 = Returns the total free space without purging
1020 =
1021 ======================
1022 */
1023
1024 dword MM_UnusedMemory (void)
1025 {
1026         unsigned free;
1027         mmblocktype far *scan;
1028
1029         free = 0;
1030         scan = mmhead;
1031
1032         while (scan->next)
1033         {
1034                 free += scan->next->start - (scan->start + scan->length);
1035                 scan = scan->next;
1036         }
1037
1038         return free*16l;
1039 }
1040
1041 //==========================================================================
1042
1043
1044 /*
1045 ======================
1046 =
1047 = MM_TotalFree
1048 =
1049 = Returns the total free space with purging
1050 =
1051 ======================
1052 */
1053
1054 dword MM_TotalFree (void)
1055 {
1056         unsigned free;
1057         mmblocktype far *scan;
1058
1059         free = 0;
1060         scan = mmhead;
1061
1062         while (scan->next)
1063         {
1064                 if ((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1065                         free += scan->length;
1066                 free += scan->next->start - (scan->start + scan->length);
1067                 scan = scan->next;
1068         }
1069
1070         return free*16l;
1071 }
1072
1073 //==========================================================================
1074
1075 /*
1076 =====================
1077 =
1078 = MM_Report
1079 =
1080 =====================
1081 */
1082
1083 void MM_Report(void)
1084 {
1085         printf("EMM %x available\n", EMSVer);
1086         printf("totalEMSpages=%u\n", totalEMSpages);
1087         printf("freeEMSpages=%u\n", freeEMSpages);
1088         printf("EMSpageframe=%Fp\n", EMSpageframe);
1089         printf("UnusedMemory=%lu\n", MM_UnusedMemory());
1090         printf("TotalFree=%lu\n", MM_TotalFree());
1091 }
1092
1093 //==========================================================================
1094
1095 /*
1096 =====================
1097 =
1098 = MM_EMSVer
1099 =
1100 =====================
1101
1102
1103 int MM_EMSVer(void)\r
1104 {
1105         int EMSver;\r
1106         __asm
1107         {
1108                 mov             ah,EMS_VERSION\r
1109                 int             EMS_INT
1110                 mov             EMSver,ax\r
1111         }
1112         return(EMSver);\r
1113 }*/
1114
1115 //==========================================================================
1116
1117 /*
1118 =====================
1119 =
1120 = MM_BombOnError
1121 =
1122 =====================
1123 */
1124
1125 void MM_BombOnError (boolean bomb)
1126 {
1127         bombonerror = bomb;
1128 }
1129
1130 //==========================================================================
1131
1132 ///////////////////////////////////////////////////////////////////////////
1133 //
1134 //      US_CheckParm() - checks to see if a string matches one of a set of
1135 //              strings. The check is case insensitive. The routine returns the
1136 //              index of the string that matched, or -1 if no matches were found
1137 //
1138 ///////////////////////////////////////////////////////////////////////////
1139 int
1140 US_CheckParm(char *parm,char **strings)
1141 {
1142         char    cp,cs,
1143                         *p,*s;
1144         int             i;
1145
1146         while (!isalpha(*parm)) // Skip non-alphas
1147                 parm++;
1148
1149         for (i = 0;*strings && **strings;i++)
1150         {
1151                 for (s = *strings++,p = parm,cs = cp = 0;cs == cp;)
1152                 {
1153                         cs = *s++;
1154                         if (!cs)
1155                                 return(i);
1156                         cp = *p++;
1157
1158                         if (isupper(cs))
1159                                 cs = tolower(cs);
1160                         if (isupper(cp))
1161                                 cp = tolower(cp);
1162                 }
1163         }
1164         return(-1);
1165 }
1166