memory/local.c

   1 /*
   2  * Local heap functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  * Copyright 1996 Huw Davies
   6  */
   7
   8 /*
   9  * Note:
  10  * All local heap functions need the current DS as first parameter
  11  * when called from the emulation library, so they take one more
  12  * parameter than usual.
  13  */
  14
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include "windows.h"
  18 #include "ldt.h"
  19 #include "global.h"
  20 #include "heap.h"
  21 #include "instance.h"
  22 #include "local.h"
  23 #include "module.h"
  24 #include "stackframe.h"
  25 #include "toolhelp.h"
  26 #include "stddebug.h"
  27 #include "debug.h"
  28
  29 #ifndef WINELIB
  30 #pragma pack(1)
  31 #endif
  32
  33 typedef struct
  34 {
  35 /* Arena header */
  36     WORD prev;          /* Previous arena | arena type */
  37     WORD next;          /* Next arena */
  38 /* Start of the memory block or free-list info */
  39     WORD size;          /* Size of the free block */
  40     WORD free_prev;     /* Previous free block */
  41     WORD free_next;     /* Next free block */
  42 } LOCALARENA;
  43
  44 #define ARENA_HEADER_SIZE      4
  45 #define ARENA_HEADER( handle) ( ((handle) & ~3) - ARENA_HEADER_SIZE)
  46
  47   /* Arena types (stored in 'prev' field of the arena) */
  48 #define LOCAL_ARENA_FREE       0
  49 #define LOCAL_ARENA_FIXED      1
  50
  51 /* Layout of a handle entry table
  52  *
  53  * WORD                     count of entries
  54  * LOCALHANDLEENTRY[count]  entries
  55  * WORD                     near ptr to next table
  56  */
  57 typedef struct
  58 {
  59     WORD addr;                /* Address of the MOVEABLE block */
  60     BYTE flags;               /* Flags for this block */
  61     BYTE lock;                /* Lock count */
  62 } LOCALHANDLEENTRY;
  63
  64 typedef struct
  65 {
  66     WORD check;                 /* 00 Heap checking flag */
  67     WORD freeze;                /* 02 Heap frozen flag */
  68     WORD items;                 /* 04 Count of items on the heap */
  69     WORD first;                 /* 06 First item of the heap */
  70     WORD pad1;                  /* 08 Always 0 */
  71     WORD last;                  /* 0a Last item of the heap */
  72     WORD pad2;                  /* 0c Always 0 */
  73     BYTE ncompact;              /* 0e Compactions counter */
  74     BYTE dislevel;              /* 0f Discard level */
  75     DWORD distotal;             /* 10 Total bytes discarded */
  76     WORD htable;                /* 14 Pointer to handle table */
  77     WORD hfree;                 /* 16 Pointer to free handle table */
  78     WORD hdelta;                /* 18 Delta to expand the handle table */
  79     WORD expand;                /* 1a Pointer to expand function (unused) */
  80     WORD pstat;                 /* 1c Pointer to status structure (unused) */
  81     FARPROC notify WINE_PACKED; /* 1e Pointer to LocalNotify() function */
  82     WORD lock;                  /* 22 Lock count for the heap */
  83     WORD extra;                 /* 24 Extra bytes to allocate when expanding */
  84     WORD minsize;               /* 26 Minimum size of the heap */
  85     WORD magic;                 /* 28 Magic number */
  86 } LOCALHEAPINFO;
  87
  88 #ifndef WINELIB
  89 #pragma pack(4)
  90 #endif
  91
  92 #define LOCAL_HEAP_MAGIC  0x484c  /* 'LH' */
  93
  94
  95   /* All local heap allocations are aligned on 4-byte boundaries */
  96 #define LALIGN(word)          (((word) + 3) & ~3)
  97
  98 #define ARENA_PTR(ptr,arena)       ((LOCALARENA *)((char*)(ptr)+(arena)))
  99 #define ARENA_PREV(ptr,arena)      (ARENA_PTR((ptr),(arena))->prev & ~3)
 100 #define ARENA_NEXT(ptr,arena)      (ARENA_PTR((ptr),(arena))->next)
 101 #define ARENA_FLAGS(ptr,arena)     (ARENA_PTR((ptr),(arena))->prev & 3)
 102
 103   /* determine whether the handle belongs to a fixed or a moveable block */
 104 #define HANDLE_FIXED(handle) (((handle) & 3) == 0)
 105 #define HANDLE_MOVEABLE(handle) (((handle) & 3) == 2)
 106
 107 /***********************************************************************
 108  *           LOCAL_GetHeap
 109  *
 110  * Return a pointer to the local heap, making sure it exists.
 111  */
 112 static LOCALHEAPINFO *LOCAL_GetHeap( HANDLE16 ds )
 113 {
 114     LOCALHEAPINFO *pInfo;
 115     INSTANCEDATA *ptr = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( ds, 0 );
 116     dprintf_local( stddeb, "Heap at %p, %04x\n", ptr, ptr->heap );
 117     if (!ptr || !ptr->heap) return NULL;
 118     if (IsBadReadPtr((SEGPTR)MAKELONG( ptr->heap, ds ), sizeof(LOCALHEAPINFO)))
 119         return NULL;
 120     pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
 121     if (pInfo->magic != LOCAL_HEAP_MAGIC) return NULL;
 122     return pInfo;
 123 }
 124
 125
 126 /***********************************************************************
 127  *           LOCAL_MakeBlockFree
 128  *
 129  * Make a block free, inserting it in the free-list.
 130  * 'block' is the handle of the block arena; 'baseptr' points to
 131  * the beginning of the data segment containing the heap.
 132  */
 133 static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
 134 {
 135     LOCALARENA *pArena, *pNext;
 136     WORD next;
 137
 138       /* Mark the block as free */
 139
 140     pArena = ARENA_PTR( baseptr, block );
 141     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
 142     pArena->size = pArena->next - block;
 143
 144       /* Find the next free block (last block is always free) */
 145
 146     next = pArena->next;
 147     for (;;)
 148     {
 149         pNext = ARENA_PTR( baseptr, next );
 150         if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
 151         next = pNext->next;
 152     }
 153
 154     dprintf_local( stddeb, "Local_AddFreeBlock %04x, next %04x\n", block, next );
 155       /* Insert the free block in the free-list */
 156
 157     pArena->free_prev = pNext->free_prev;
 158     pArena->free_next = next;
 159     ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
 160     pNext->free_prev  = block;
 161 }
 162
 163
 164 /***********************************************************************
 165  *           LOCAL_RemoveFreeBlock
 166  *
 167  * Remove a block from the free-list.
 168  * 'block' is the handle of the block arena; 'baseptr' points to
 169  * the beginning of the data segment containing the heap.
 170  */
 171 static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
 172 {
 173       /* Mark the block as fixed */
 174
 175     LOCALARENA *pArena = ARENA_PTR( baseptr, block );
 176     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
 177
 178       /* Remove it from the list */
 179
 180     ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
 181     ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
 182 }
 183
 184
 185 /***********************************************************************
 186  *           LOCAL_AddBlock
 187  *
 188  * Insert a new block in the heap.
 189  * 'new' is the handle of the new block arena; 'baseptr' points to
 190  * the beginning of the data segment containing the heap; 'prev' is
 191  * the block before the new one.
 192  */
 193 static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
 194 {
 195     LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
 196     LOCALARENA *pNew  = ARENA_PTR( baseptr, new );
 197
 198     pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
 199     pNew->next = pPrev->next;
 200     ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
 201     ARENA_PTR(baseptr,pPrev->next)->prev |= new;
 202     pPrev->next = new;
 203 }
 204
 205
 206 /***********************************************************************
 207  *           LOCAL_RemoveBlock
 208  *
 209  * Remove a block from the heap.
 210  * 'block' is the handle of the block arena; 'baseptr' points to
 211  * the beginning of the data segment containing the heap.
 212  */
 213 static void LOCAL_RemoveBlock( char *baseptr, WORD block )
 214 {
 215     LOCALARENA *pArena, *pTmp;
 216
 217       /* Remove the block from the free-list */
 218
 219     dprintf_local( stddeb, "Local_RemoveBlock\n");
 220     pArena = ARENA_PTR( baseptr, block );
 221     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 222         LOCAL_RemoveFreeBlock( baseptr, block );
 223
 224       /* If the previous block is free, expand its size */
 225
 226     pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
 227     if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
 228         pTmp->size += pArena->next - block;
 229
 230       /* Remove the block from the linked list */
 231
 232     pTmp->next = pArena->next;
 233     pTmp = ARENA_PTR( baseptr, pArena->next );
 234     pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
 235 }
 236
 237
 238 /***********************************************************************
 239  *           LOCAL_PrintHeap
 240  */
 241 static void LOCAL_PrintHeap( HANDLE16 ds )
 242 {
 243     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 244     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
 245     WORD arena;
 246
 247     if (!debugging_local) return;
 248     if (!pInfo)
 249     {
 250         printf( "Local Heap corrupted!  ds=%04x\n", ds );
 251         return;
 252     }
 253     printf( "Local Heap  ds=%04x first=%04x last=%04x items=%d\n",
 254             ds, pInfo->first, pInfo->last, pInfo->items );
 255
 256     arena = pInfo->first;
 257     for (;;)
 258     {
 259         LOCALARENA *pArena = ARENA_PTR(ptr,arena);
 260         printf( "  %04x: prev=%04x next=%04x type=%d\n", arena,
 261                 pArena->prev & ~3, pArena->next, pArena->prev & 3 );
 262         if (arena == pInfo->first)
 263         {
 264             printf( "        size=%d free_prev=%04x free_next=%04x\n",
 265                     pArena->size, pArena->free_prev, pArena->free_next );
 266         }
 267         if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 268         {
 269             printf( "        size=%d free_prev=%04x free_next=%04x\n",
 270                     pArena->size, pArena->free_prev, pArena->free_next );
 271             if (pArena->next == arena) break;  /* last one */
 272             if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
 273             {
 274                 printf( "*** arena->free_next->free_prev != arena\n" );
 275                 break;
 276             }
 277         }
 278         if (pArena->next == arena)
 279         {
 280             printf( "*** last block is not marked free\n" );
 281             break;
 282         }
 283         if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
 284         {
 285             printf( "*** arena->next->prev != arena (%04x, %04x)\n",
 286                    pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
 287             break;
 288         }
 289         arena = pArena->next;
 290     }
 291 }
 292
 293
 294 /***********************************************************************
 295  *           LocalInit   (KERNEL.4)
 296  */
 297 BOOL LocalInit( HANDLE selector, WORD start, WORD end )
 298 {
 299     char *ptr;
 300     WORD heapInfoArena, freeArena, lastArena;
 301     LOCALHEAPINFO *pHeapInfo;
 302     LOCALARENA *pArena, *pFirstArena, *pLastArena;
 303     NE_MODULE *pModule;
 304
 305       /* The initial layout of the heap is: */
 306       /* - first arena         (FIXED)      */
 307       /* - heap info structure (FIXED)      */
 308       /* - large free block    (FREE)       */
 309       /* - last arena          (FREE)       */
 310
 311     dprintf_local(stddeb, "LocalInit: %04x %04x-%04x\n", selector, start, end);
 312     if (!selector) selector = CURRENT_DS;
 313
 314     if (debugging_heap)
 315     {
 316         /* If debugging_heap is set, the global heap blocks are cleared */
 317         /* before use, so we can test for double initialization. */
 318         if (LOCAL_GetHeap(selector))
 319         {
 320             fprintf( stderr, "LocalInit: Heap %04x initialized twice.\n", selector);
 321             if (debugging_local) LOCAL_PrintHeap(selector);
 322         }
 323     }
 324
 325     if (start == 0) {
 326       /* Check if the segment is the DGROUP of a module */
 327
 328         if ((pModule = MODULE_GetPtr( GetExePtr( selector ) )))
 329         {
 330             SEGTABLEENTRY *pSeg = NE_SEG_TABLE( pModule ) + pModule->dgroup - 1;
 331             if (pModule->dgroup && (pSeg->selector == selector)) {
 332                 /* We can't just use the simple method of using the value
 333                  * of minsize + stacksize, since there are programs that
 334                  * resize the data segment before calling InitTask(). So,
 335                  * we must put it at the end of the segment */
 336                 start = GlobalSize16( GlobalHandle16( selector ) );
 337                 start -= end;
 338                 end += start;
 339                 dprintf_local( stddeb," new start %04x, minstart: %04x\n", start, pSeg->minsize + pModule->stack_size);
 340             }
 341         }
 342     }
 343     ptr = PTR_SEG_OFF_TO_LIN( selector, 0 );
 344
 345     start = LALIGN( MAX( start, sizeof(INSTANCEDATA) ) );
 346     heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
 347     freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
 348                         + sizeof(LOCALHEAPINFO) );
 349     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 350
 351       /* Make sure there's enough space.       */
 352
 353     if (freeArena + sizeof(LOCALARENA) >= lastArena) return FALSE;
 354
 355       /* Initialise the first arena */
 356
 357     pFirstArena = ARENA_PTR( ptr, start );
 358     pFirstArena->prev      = start | LOCAL_ARENA_FIXED;
 359     pFirstArena->next      = heapInfoArena;
 360     pFirstArena->size      = LALIGN(sizeof(LOCALARENA));
 361     pFirstArena->free_prev = start;  /* this one */
 362     pFirstArena->free_next = freeArena;
 363
 364       /* Initialise the arena of the heap info structure */
 365
 366     pArena = ARENA_PTR( ptr, heapInfoArena );
 367     pArena->prev = start | LOCAL_ARENA_FIXED;
 368     pArena->next = freeArena;
 369
 370       /* Initialise the heap info structure */
 371
 372     pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
 373     memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
 374     pHeapInfo->items   = 4;
 375     pHeapInfo->first   = start;
 376     pHeapInfo->last    = lastArena;
 377     pHeapInfo->htable  = 0;
 378     pHeapInfo->hdelta  = 0x20;
 379     pHeapInfo->extra   = 0x200;
 380     pHeapInfo->minsize = lastArena - freeArena;
 381     pHeapInfo->magic   = LOCAL_HEAP_MAGIC;
 382
 383       /* Initialise the large free block */
 384
 385     pArena = ARENA_PTR( ptr, freeArena );
 386     pArena->prev      = heapInfoArena | LOCAL_ARENA_FREE;
 387     pArena->next      = lastArena;
 388     pArena->size      = lastArena - freeArena;
 389     pArena->free_prev = start;
 390     pArena->free_next = lastArena;
 391
 392       /* Initialise the last block */
 393
 394     pLastArena = ARENA_PTR( ptr, lastArena );
 395     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 396     pLastArena->next      = lastArena;  /* this one */
 397     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 398     pLastArena->free_prev = freeArena;
 399     pLastArena->free_next = lastArena;  /* this one */
 400
 401       /* Store the local heap address in the instance data */
 402
 403     ((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
 404     LOCAL_PrintHeap( selector );
 405     return TRUE;
 406 }
 407
 408 /***********************************************************************
 409  *           LOCAL_GrowHeap
 410  */
 411 static void LOCAL_GrowHeap( HANDLE16 ds )
 412 {
 413     HANDLE hseg = GlobalHandle16( ds );
 414     LONG oldsize = GlobalSize16( hseg );
 415     LONG end;
 416     LOCALHEAPINFO *pHeapInfo;
 417     WORD freeArena, lastArena;
 418     LOCALARENA *pArena, *pLastArena;
 419     char *ptr;
 420
 421     /* if nothing can be gained, return */
 422     if (oldsize > 0xfff0) return;
 423     hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
 424     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 425     pHeapInfo = LOCAL_GetHeap( ds );
 426     if (pHeapInfo == NULL) {
 427         fprintf( stderr, "Local_GrowHeap: heap not found\n" );
 428         return;
 429     }
 430     end = GlobalSize16( hseg );
 431     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 432
 433       /* Update the HeapInfo */
 434     pHeapInfo->items++;
 435     freeArena = pHeapInfo->last;
 436     pHeapInfo->last = lastArena;
 437     pHeapInfo->minsize += end - oldsize;
 438
 439       /* grow the old last block */
 440     pArena = ARENA_PTR( ptr, freeArena );
 441     pArena->size      = lastArena - freeArena;
 442     pArena->next      = lastArena;
 443     pArena->free_next = lastArena;
 444
 445       /* Initialise the new last block */
 446
 447     pLastArena = ARENA_PTR( ptr, lastArena );
 448     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 449     pLastArena->next      = lastArena;  /* this one */
 450     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 451     pLastArena->free_prev = freeArena;
 452     pLastArena->free_next = lastArena;  /* this one */
 453
 454     /* If block before freeArena is also free then merge them */
 455     if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
 456     {
 457         LOCAL_RemoveBlock(ptr, freeArena);
 458         pHeapInfo->items--;
 459     }
 460
 461     dprintf_local( stddeb, "Heap expanded\n" );
 462     LOCAL_PrintHeap( ds );
 463 }
 464
 465
 466 /***********************************************************************
 467  *           LOCAL_FreeArena
 468  */
 469 static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
 470 {
 471     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 472     LOCALHEAPINFO *pInfo;
 473     LOCALARENA *pArena, *pPrev, *pNext;
 474
 475     dprintf_local( stddeb, "LocalFreeArena: %04x ds=%04x\n", arena, ds );
 476     if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
 477
 478     pArena = ARENA_PTR( ptr, arena );
 479     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 480     {
 481         /* shouldn't happen */
 482         fprintf( stderr, "LocalFreeArena: Trying to free block %04x twice!\n",
 483                  arena );
 484         LOCAL_PrintHeap( ds );
 485         return arena;
 486     }
 487
 488       /* Check if we can merge with the previous block */
 489
 490     pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
 491     pNext = ARENA_PTR( ptr, pArena->next );
 492     if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
 493     {
 494         arena  = pArena->prev & ~3;
 495         pArena = pPrev;
 496         LOCAL_RemoveBlock( ptr, pPrev->next );
 497         pInfo->items--;
 498     }
 499     else  /* Make a new free block */
 500     {
 501         LOCAL_MakeBlockFree( ptr, arena );
 502     }
 503
 504       /* Check if we can merge with the next block */
 505
 506     if ((pArena->next == pArena->free_next) &&
 507         (pArena->next != pInfo->last))
 508     {
 509         LOCAL_RemoveBlock( ptr, pArena->next );
 510         pInfo->items--;
 511     }
 512     return 0;
 513 }
 514
 515
 516 /***********************************************************************
 517  *           LOCAL_ShrinkArena
 518  *
 519  * Shrink an arena by creating a free block at its end if possible.
 520  * 'size' includes the arena header, and must be aligned.
 521  */
 522 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
 523 {
 524     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 525     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 526
 527     if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
 528     {
 529         LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
 530         if (!pInfo) return;
 531         LOCAL_AddBlock( ptr, arena, arena + size );
 532         pInfo->items++;
 533         LOCAL_FreeArena( ds, arena + size );
 534     }
 535 }
 536
 537
 538 /***********************************************************************
 539  *           LOCAL_GrowArenaDownward
 540  *
 541  * Grow an arena downward by using the previous arena (must be free).
 542  */
 543 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
 544 {
 545     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 546     LOCALHEAPINFO *pInfo;
 547     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 548     WORD prevArena = pArena->prev & ~3;
 549     LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
 550     WORD offset, size;
 551     char *p;
 552
 553     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 554     offset = pPrevArena->size;
 555     size = pArena->next - arena - ARENA_HEADER_SIZE;
 556     LOCAL_RemoveFreeBlock( ptr, prevArena );
 557     LOCAL_RemoveBlock( ptr, arena );
 558     pInfo->items--;
 559     p = (char *)pPrevArena + ARENA_HEADER_SIZE;
 560     while (offset < size)
 561     {
 562         memcpy( p, p + offset, offset );
 563         p += offset;
 564         size -= offset;
 565     }
 566     if (size) memcpy( p, p + offset, size );
 567     LOCAL_ShrinkArena( ds, prevArena, newsize );
 568 }
 569
 570
 571 /***********************************************************************
 572  *           LOCAL_GetFreeSpace
 573  */
 574 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
 575 {
 576     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 577     LOCALHEAPINFO *pInfo;
 578     LOCALARENA *pArena;
 579     WORD arena;
 580     WORD freespace = 0;
 581
 582     if (!(pInfo = LOCAL_GetHeap( ds )))
 583     {
 584         fprintf( stderr, "LOCAL_GetFreeSpace: Local heap not found\n" );
 585         LOCAL_PrintHeap(ds);
 586         return 0;
 587     }
 588     arena = pInfo->first;
 589     pArena = ARENA_PTR( ptr, arena );
 590     while (arena != pArena->free_next)
 591     {
 592         arena = pArena->free_next;
 593         pArena = ARENA_PTR( ptr, arena );
 594         if (pArena->size >= freespace) freespace = pArena->size;
 595     }
 596     /* FIXME doesn't yet calculate space that would become free if everything
 597        were discarded when countdiscard == 1 */
 598     if (freespace < ARENA_HEADER_SIZE) freespace = 0;
 599     else freespace -= ARENA_HEADER_SIZE;
 600     return freespace;
 601 }
 602
 603
 604 /***********************************************************************
 605  *           LOCAL_Compact
 606  */
 607 static WORD LOCAL_Compact( HANDLE16 ds, WORD minfree, WORD flags )
 608 {
 609     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 610     LOCALHEAPINFO *pInfo;
 611     LOCALARENA *pArena, *pMoveArena, *pFinalArena;
 612     WORD arena, movearena, finalarena, table;
 613     WORD count, movesize, size;
 614     WORD freespace;
 615     LOCALHANDLEENTRY *pEntry;
 616
 617     if (!(pInfo = LOCAL_GetHeap( ds )))
 618     {
 619         fprintf( stderr, "Local_Compact: Local heap not found\n" );
 620         LOCAL_PrintHeap(ds);
 621         return 0;
 622     }
 623     dprintf_local(stddeb,
 624                   "LOCAL_Compact: ds = %04x, minfree = %04x, flags = %04x\n",
 625                   ds, minfree, flags);
 626     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 627     if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
 628     {
 629         dprintf_local(stddeb, "Returning %04x.\n", freespace);
 630         return freespace;
 631     }
 632     dprintf_local(stddeb, "Local_Compact: Compacting heap %04x.\n", ds);
 633     table = pInfo->htable;
 634     while(table)
 635     {
 636         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 637         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 638         {
 639             if((pEntry->lock == 0) && !(pEntry->flags &
 640                                         (LMEM_DISCARDED >> 8)))
 641             {
 642                 /* OK we can move this one if we want */
 643                 dprintf_local(stddeb,
 644                               "handle %04x (block %04x) can be moved.\n",
 645                               (WORD)((char *)pEntry - ptr), pEntry->addr);
 646                 movearena = ARENA_HEADER(pEntry->addr);
 647                 pMoveArena = ARENA_PTR(ptr, movearena);
 648                 movesize = pMoveArena->next - movearena;
 649                 arena = pInfo->first;
 650                 pArena = ARENA_PTR(ptr, arena);
 651                 size = 0xffff;
 652                 finalarena = 0;
 653                 /* Try to find the smallest arena that will do, */
 654                 /* which is below us in memory */
 655                 for(;;)
 656                 {
 657                     arena = pArena->free_next;
 658                     pArena = ARENA_PTR(ptr, arena);
 659                     if(arena >= movearena)
 660                         break;
 661                     if(arena == pArena->free_next)
 662                         break;
 663                     if((pArena->size >= movesize) && (pArena->size < size))
 664                     {
 665                         size = pArena->size;
 666                         finalarena = arena;
 667                     }
 668                 }
 669                 if (finalarena) /* Actually got somewhere to move */
 670                 {
 671                     dprintf_local(stddeb, "Moving it to %04x.\n", finalarena);
 672                     pFinalArena = ARENA_PTR(ptr, finalarena);
 673                     size = pFinalArena->size;
 674                     LOCAL_RemoveFreeBlock(ptr, finalarena);
 675                     LOCAL_ShrinkArena( ds, finalarena, movesize );
 676                     /* Copy the arena to it's new location */
 677                     memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
 678                            (char *)pMoveArena + ARENA_HEADER_SIZE,
 679                            movesize - ARENA_HEADER_SIZE );
 680                     /* Free the old location */
 681                     LOCAL_FreeArena(ds, movearena);
 682                     /* Update handle table entry */
 683                     pEntry->addr = finalarena + ARENA_HEADER_SIZE;
 684                 }
 685                 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
 686                                == LOCAL_ARENA_FREE)
 687                 {
 688                     /* Previous arena is free (but < movesize)  */
 689                     /* so we can 'slide' movearena down into it */
 690                     finalarena = pMoveArena->prev & ~3;
 691                     LOCAL_GrowArenaDownward( ds, movearena, movesize );
 692                     /* Update handle table entry */
 693                     pEntry->addr = finalarena + ARENA_HEADER_SIZE;
 694                 }
 695             }
 696         }
 697         table = *(WORD *)pEntry;
 698     }
 699     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 700     if(freespace >= minfree || (flags & LMEM_NODISCARD))
 701     {
 702         dprintf_local(stddeb, "Returning %04x.\n", freespace);
 703         return freespace;
 704     }
 705
 706     table = pInfo->htable;
 707     while(table)
 708     {
 709         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 710         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 711         {
 712             if((pEntry->flags & (LMEM_DISCARDABLE >> 8)) &&
 713                pEntry->lock == 0 && !(pEntry->flags & (LMEM_DISCARDED >> 8)))
 714             {
 715                 dprintf_local(stddeb, "Discarding handle %04x (block %04x).\n",
 716                               (char *)pEntry - ptr, pEntry->addr);
 717                 LOCAL_FreeArena(ds, pEntry->addr);
 718                 pEntry->addr = 0;
 719                 pEntry->flags |= (LMEM_DISCARDED >> 8);
 720                 /* Call localnotify proc */
 721             }
 722         }
 723         table = *(WORD *)pEntry;
 724     }
 725     return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
 726 }
 727
 728
 729 /***********************************************************************
 730  *           LOCAL_FindFreeBlock
 731  */
 732 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
 733 {
 734     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 735     LOCALHEAPINFO *pInfo;
 736     LOCALARENA *pArena;
 737     WORD arena;
 738
 739     if (!(pInfo = LOCAL_GetHeap( ds )))
 740     {
 741         fprintf( stderr, "Local_FindFreeBlock: Local heap not found\n" );
 742         LOCAL_PrintHeap(ds);
 743         return 0;
 744     }
 745
 746     arena = pInfo->first;
 747     pArena = ARENA_PTR( ptr, arena );
 748     for (;;) {
 749         arena = pArena->free_next;
 750         pArena = ARENA_PTR( ptr, arena );
 751         if (arena == pArena->free_next) break;
 752         if (pArena->size >= size) return arena;
 753     }
 754     dprintf_local( stddeb, "Local_FindFreeBlock: not enough space\n" );
 755     if (debugging_local) LOCAL_PrintHeap(ds);
 756     return 0;
 757 }
 758
 759 /***********************************************************************
 760  *           LOCAL_GetBlock
 761  * The segment may get moved around in this function, so all callers
 762  * should reset their pointer variables.
 763  */
 764 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
 765 {
 766     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 767     LOCALHEAPINFO *pInfo;
 768     LOCALARENA *pArena;
 769     WORD arena;
 770
 771     if (!(pInfo = LOCAL_GetHeap( ds )))
 772     {
 773         fprintf( stderr, "Local_GetBlock: Local heap not found\n");
 774         LOCAL_PrintHeap(ds);
 775         return 0;
 776     }
 777
 778     size += ARENA_HEADER_SIZE;
 779     size = LALIGN( MAX( size, sizeof(LOCALARENA) ) );
 780
 781       /* Find a suitable free block */
 782     arena = LOCAL_FindFreeBlock( ds, size );
 783     if (arena == 0) {
 784         /* no space: try to make some */
 785         LOCAL_Compact( ds, size, flags );
 786         arena = LOCAL_FindFreeBlock( ds, size );
 787     }
 788     if (arena == 0) {
 789         /* still no space: try to grow the segment */
 790         LOCAL_GrowHeap( ds );
 791         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 792         pInfo = LOCAL_GetHeap( ds );
 793         arena = LOCAL_FindFreeBlock( ds, size );
 794     }
 795     if (arena == 0) {
 796         fprintf( stderr, "Local_GetBlock: not enough space in heap %04x for %d bytes\n",
 797                  ds, size );
 798         return 0;
 799     }
 800
 801       /* Make a block out of the free arena */
 802     pArena = ARENA_PTR( ptr, arena );
 803     dprintf_local(stddeb, "LOCAL_GetBlock size = %04x, arena %04x size %04x\n",
 804                   size, arena, pArena->size );
 805     LOCAL_RemoveFreeBlock( ptr, arena );
 806     LOCAL_ShrinkArena( ds, arena, size );
 807
 808     if (flags & LMEM_ZEROINIT) memset( (char *)pArena + ARENA_HEADER_SIZE, 0,
 809                                        size - ARENA_HEADER_SIZE );
 810     return arena + ARENA_HEADER_SIZE;
 811 }
 812
 813
 814 /***********************************************************************
 815  *           LOCAL_NewHTable
 816  */
 817 static BOOL LOCAL_NewHTable( HANDLE16 ds )
 818 {
 819     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 820     LOCALHEAPINFO *pInfo;
 821     LOCALHANDLEENTRY *pEntry;
 822     HLOCAL16 handle;
 823     int i;
 824
 825     dprintf_local( stddeb, "Local_NewHTable\n" );
 826     if (!(pInfo = LOCAL_GetHeap( ds )))
 827     {
 828         fprintf( stderr, "Local heap not found\n");
 829         LOCAL_PrintHeap(ds);
 830         return FALSE;
 831     }
 832
 833     if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
 834                                    + 2 * sizeof(WORD), LMEM_FIXED )))
 835         return FALSE;
 836     if (!(ptr = PTR_SEG_OFF_TO_LIN( ds, 0 )))
 837         fprintf(stderr, "LOCAL_NewHTable: ptr == NULL after GetBlock.\n");
 838     if (!(pInfo = LOCAL_GetHeap( ds )))
 839         fprintf(stderr,"LOCAL_NewHTable: pInfo == NULL after GetBlock.\n");
 840
 841     /* Fill the entry table */
 842
 843     *(WORD *)(ptr + handle) = pInfo->hdelta;
 844     pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
 845     for (i = pInfo->hdelta; i > 0; i--) (pEntry++)->lock = 0xff;
 846     *(WORD *)pEntry = pInfo->htable;
 847     pInfo->htable = handle;
 848     return TRUE;
 849 }
 850
 851
 852 /***********************************************************************
 853  *           LOCAL_GetNewHandleEntry
 854  */
 855 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
 856 {
 857     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 858     LOCALHEAPINFO *pInfo;
 859     LOCALHANDLEENTRY *pEntry = NULL;
 860     WORD table;
 861
 862     if (!(pInfo = LOCAL_GetHeap( ds )))
 863     {
 864         fprintf( stderr, "LOCAL_GetNewHandleEntry: Local heap not found\n");
 865         LOCAL_PrintHeap(ds);
 866         return 0;
 867     }
 868
 869     /* Find a free slot in existing tables */
 870
 871     table = pInfo->htable;
 872     while (table)
 873     {
 874         WORD count = *(WORD *)(ptr + table);
 875         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 876         for (; count > 0; count--, pEntry++)
 877             if (pEntry->lock == 0xff) break;
 878         if (count) break;
 879         table = *(WORD *)pEntry;
 880     }
 881
 882     if (!table)  /* We need to create a new table */
 883     {
 884         if (!LOCAL_NewHTable( ds )) return 0;
 885         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 886         pInfo = LOCAL_GetHeap( ds );
 887         pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
 888     }
 889
 890     /* Now allocate this entry */
 891
 892     pEntry->lock = 0;
 893     dprintf_local( stddeb, "LOCAL_GetNewHandleEntry(%04x): %04x\n",
 894                    ds, ((char *)pEntry - ptr) );
 895     return (HLOCAL16)((char *)pEntry - ptr);
 896 }
 897
 898
 899 /***********************************************************************
 900  *           LOCAL_FreeHandleEntry
 901  *
 902  * Free a handle table entry.
 903  */
 904 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
 905 {
 906     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 907     LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
 908     LOCALHEAPINFO *pInfo;
 909     WORD *pTable;
 910     WORD table, count, i;
 911
 912     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 913
 914     /* Find the table where this handle comes from */
 915
 916     pTable = &pInfo->htable;
 917     while (*pTable)
 918     {
 919         WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
 920         if ((handle >= *pTable + sizeof(WORD)) &&
 921             (handle < *pTable + sizeof(WORD) + size)) break;  /* Found it */
 922         pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
 923     }
 924     if (!*pTable)
 925     {
 926         fprintf(stderr, "LOCAL_FreeHandleEntry: invalid entry %04x\n", handle);
 927         LOCAL_PrintHeap( ds );
 928         return;
 929     }
 930
 931     /* Make the entry free */
 932
 933     pEntry->addr = 0;  /* just in case */
 934     pEntry->lock = 0xff;
 935
 936     /* Now check if all entries in this table are free */
 937
 938     table = *pTable;
 939     pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 940     count = *(WORD *)(ptr + table);
 941     for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
 942
 943     /* Remove the table from the linked list and free it */
 944
 945     dprintf_local( stddeb, "LOCAL_FreeHandleEntry(%04x): freeing table %04x\n",
 946                    ds, table);
 947     *pTable = *(WORD *)pEntry;
 948     LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
 949 }
 950
 951
 952 /***********************************************************************
 953  *           LOCAL_Free
 954  *
 955  * Implementation of LocalFree().
 956  */
 957 HLOCAL16 LOCAL_Free( HANDLE16 ds, HLOCAL16 handle )
 958 {
 959     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 960
 961     dprintf_local( stddeb, "LocalFree: %04x ds=%04x\n", handle, ds );
 962
 963     if (!handle) { fprintf( stderr, "LOCAL_Free: handle is 0.\n" ); return 0; }
 964     if (HANDLE_FIXED( handle ))
 965     {
 966         if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0;  /* OK */
 967         else return handle;  /* couldn't free it */
 968     }
 969     else
 970     {
 971         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
 972         if (!(pEntry->flags & (LMEM_DISCARDED >> 8)))
 973         {
 974             dprintf_local( stddeb, "LocalFree: real block at %04x\n",
 975                            pEntry->addr );
 976             if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr) ))
 977                 return handle; /* couldn't free it */
 978         }
 979         LOCAL_FreeHandleEntry( ds, handle );
 980         return 0;  /* OK */
 981     }
 982 }
 983
 984
 985 /***********************************************************************
 986  *           LOCAL_Alloc
 987  *
 988  * Implementation of LocalAlloc().
 989  */
 990 HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD flags, WORD size )
 991 {
 992     char *ptr;
 993     HLOCAL16 handle;
 994
 995     dprintf_local( stddeb, "LocalAlloc: %04x %d ds=%04x\n", flags, size, ds );
 996
 997     if (flags & LMEM_MOVEABLE)
 998     {
 999         LOCALHANDLEENTRY *plhe;
1000         HLOCAL16 hmem;
1001
1002         if (!(hmem = LOCAL_GetBlock( ds, size, flags ))) return 0;
1003         if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1004         {
1005             fprintf( stderr, "LocalAlloc: couldn't get handle\n");
1006             LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1007             return 0;
1008         }
1009         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1010         plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1011         plhe->addr = hmem;
1012         plhe->flags = (BYTE)(flags >> 8);
1013         plhe->lock = 0;
1014     }
1015     else handle = LOCAL_GetBlock( ds, size, flags );
1016
1017     return handle;
1018 }
1019
1020
1021 /***********************************************************************
1022  *           LOCAL_ReAlloc
1023  *
1024  * Implementation of LocalReAlloc().
1025  */
1026 HLOCAL16 LOCAL_ReAlloc( HANDLE16 ds, HLOCAL16 handle, WORD size, WORD flags )
1027 {
1028     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1029     LOCALHEAPINFO *pInfo;
1030     LOCALARENA *pArena, *pNext;
1031     LOCALHANDLEENTRY *pEntry;
1032     WORD arena, newhandle, blockhandle, oldsize;
1033     LONG nextarena;
1034
1035     if (!handle) return LOCAL_Alloc( ds, size, flags );
1036
1037     dprintf_local( stddeb, "LocalReAlloc: %04x %d %04x ds=%04x\n",
1038                    handle, size, flags, ds );
1039     if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1040
1041     if (HANDLE_FIXED( handle )) blockhandle = handle;
1042     else
1043     {
1044         pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1045         if(pEntry->flags & (LMEM_DISCARDED >> 8))
1046         {
1047             dprintf_local(stddeb, "ReAllocating discarded block\n");
1048             if (!(pEntry->addr = LOCAL_GetBlock( ds, size, flags))) return 0;
1049             ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1050             pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1051             pEntry->flags = (BYTE) (flags >> 8);
1052             pEntry->lock = 0;
1053             return handle;
1054         }
1055         if (!(blockhandle = pEntry->addr))
1056         {
1057             fprintf( stderr, "Local_ReAlloc(%04x,%04x): invalid handle\n",
1058                      ds, handle );
1059             return 0;
1060         }
1061     }
1062
1063     arena = ARENA_HEADER( blockhandle );
1064     dprintf_local( stddeb, "LocalReAlloc: arena is %04x\n", arena );
1065     pArena = ARENA_PTR( ptr, arena );
1066
1067     if ((flags & LMEM_MODIFY) && (flags & LMEM_DISCARDABLE))
1068     {
1069         if (HANDLE_FIXED(handle))
1070         {
1071             fprintf(stderr,"LocalReAlloc: LMEM_MODIFY & LMEM_DISCARDABLE on a fixed handle.\n");
1072             return handle;
1073         }
1074         dprintf_local( stddeb, "Making block discardable.\n" );
1075         pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1076         pEntry->flags |= (LMEM_DISCARDABLE >> 8);
1077         return handle;
1078     }
1079
1080     if ((flags & LMEM_MODIFY) || (flags & LMEM_DISCARDABLE))
1081     {
1082         fprintf(stderr,"LocalReAlloc: flags %04x. MODIFY & DISCARDABLE should both be set\n", flags);
1083         return handle;
1084     }
1085
1086     if (!size)
1087     {
1088         if (HANDLE_FIXED(handle))
1089         {
1090             if (flags & LMEM_MOVEABLE)
1091             {
1092                 dprintf_local(stddeb, "Freeing fixed block.\n");
1093                 return LOCAL_Free( ds, handle );
1094             }
1095             else size = 1;
1096         }
1097         else
1098         {
1099             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1100             if (pEntry->lock == 0)
1101             {
1102                 /* discards moveable blocks is this right? */
1103                 dprintf_local(stddeb,"Discarding block\n");
1104                 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
1105                 pEntry->addr = 0;
1106                 pEntry->flags = (LMEM_DISCARDED >> 8);
1107                 return 0;
1108             }
1109             return handle;
1110         }
1111     }
1112
1113     size = LALIGN( size );
1114     oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1115     nextarena = LALIGN(blockhandle + size);
1116
1117       /* Check for size reduction */
1118
1119     if (nextarena <= pArena->next)
1120     {
1121         if (nextarena < pArena->next - LALIGN(sizeof(LOCALARENA)))
1122         {
1123             dprintf_local( stddeb, "size reduction, making new free block\n");
1124               /* It is worth making a new free block */
1125             LOCAL_AddBlock( ptr, arena, nextarena );
1126             pInfo->items++;
1127             LOCAL_FreeArena( ds, nextarena );
1128         }
1129         dprintf_local( stddeb, "LocalReAlloc: returning %04x\n", handle );
1130         return handle;
1131     }
1132
1133       /* Check if the next block is free */
1134
1135     pNext = ARENA_PTR( ptr, pArena->next );
1136     if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1137         (nextarena <= pNext->next))
1138     {
1139         LOCAL_RemoveBlock( ptr, pArena->next );
1140         if (nextarena < pArena->next - LALIGN(sizeof(LOCALARENA)))
1141         {
1142             dprintf_local( stddeb, "size increase, making new free block\n");
1143               /* It is worth making a new free block */
1144             LOCAL_AddBlock( ptr, arena, nextarena );
1145             pInfo->items++;
1146             LOCAL_FreeArena( ds, nextarena );
1147         }
1148         dprintf_local( stddeb, "LocalReAlloc: returning %04x\n", handle );
1149         return handle;
1150     }
1151
1152     /* Now we have to allocate a new block, but not if fixed block and no
1153        LMEM_MOVEABLE */
1154
1155     if (HANDLE_FIXED(handle) && !(flags & LMEM_MOVEABLE))
1156     {
1157         dprintf_local(stddeb, "Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1158         return 0;  /* FIXME: should we free it here? */
1159     }
1160
1161     newhandle = LOCAL_GetBlock( ds, size, flags );
1162     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1163     if (!newhandle)
1164     {
1165         /* Remove the block from the heap and try again */
1166         LPSTR buffer = HeapAlloc( SystemHeap, 0, oldsize );
1167         if (!buffer) return 0;
1168         memcpy( buffer, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1169         LOCAL_FreeArena( ds, arena );
1170         if (!(newhandle = LOCAL_GetBlock( ds, size, flags )))
1171         {
1172             if (!(newhandle = LOCAL_GetBlock( ds, oldsize, flags )))
1173             {
1174                 fprintf( stderr, "LocalRealloc: can't restore saved block\n" );
1175                 HeapFree( SystemHeap, 0, buffer );
1176                 return 0;
1177             }
1178             size = oldsize;
1179         }
1180         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1181         memcpy( ptr + newhandle, buffer, oldsize );
1182         HeapFree( SystemHeap, 0, buffer );
1183     }
1184     else
1185     {
1186         memcpy( ptr + newhandle, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1187         LOCAL_FreeArena( ds, arena );
1188     }
1189     if (HANDLE_MOVEABLE( handle ))
1190     {
1191         dprintf_local( stddeb, "LocalReAlloc: fixing handle\n");
1192         pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1193         pEntry->addr = newhandle;
1194         pEntry->lock = 0;
1195         newhandle = handle;
1196     }
1197     if (size == oldsize) newhandle = 0;  /* Realloc failed */
1198     dprintf_local( stddeb, "LocalReAlloc: returning %04x\n", newhandle );
1199     return newhandle;
1200 }
1201
1202
1203 /***********************************************************************
1204  *           LOCAL_InternalLock
1205  */
1206 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1207 {
1208     dprintf_local( stddeb, "LocalLock: %04x ", handle );
1209     if (HANDLE_MOVEABLE(handle))
1210     {
1211         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1212         if (pEntry->lock < 0xfe) pEntry->lock++;
1213         handle = pEntry->addr;
1214     }
1215     dprintf_local( stddeb, "returning %04x\n", handle );
1216     return handle;
1217 }
1218
1219
1220 /***********************************************************************
1221  *           LOCAL_Lock
1222  */
1223 LPSTR LOCAL_Lock( HANDLE16 ds, HLOCAL16 handle )
1224 {
1225     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1226     return handle ? ptr + LOCAL_InternalLock( ptr, handle ) : NULL;
1227 }
1228
1229
1230 /***********************************************************************
1231  *           LOCAL_Unlock
1232  */
1233 BOOL LOCAL_Unlock( HANDLE16 ds, HLOCAL16 handle )
1234 {
1235     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1236
1237     dprintf_local( stddeb, "LocalUnlock: %04x\n", handle );
1238     if (HANDLE_MOVEABLE(handle))
1239     {
1240         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1241         if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1242         /* For moveable block, return the new lock count */
1243         /* (see _Windows_Internals_ p. 197) */
1244         return --pEntry->lock;
1245     }
1246     else return FALSE;
1247 }
1248
1249
1250 /***********************************************************************
1251  *           LOCAL_Size
1252  *
1253  * Implementation of LocalSize().
1254  */
1255 WORD LOCAL_Size( HANDLE16 ds, HLOCAL16 handle )
1256 {
1257     char *ptr = PTR_SEG_OFF_TO_LIN( CURRENT_DS, 0 );
1258     LOCALARENA *pArena;
1259
1260     dprintf_local( stddeb, "LocalSize: %04x ds=%04x\n", handle, ds );
1261
1262     if (HANDLE_MOVEABLE( handle )) handle = *(WORD *)(ptr + handle);
1263     pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1264     return pArena->next - handle;
1265 }
1266
1267
1268 /***********************************************************************
1269  *           LOCAL_Flags
1270  *
1271  * Implementation of LocalFlags().
1272  */
1273 WORD LOCAL_Flags( HANDLE16 ds, HLOCAL16 handle )
1274 {
1275     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1276
1277     if (HANDLE_MOVEABLE(handle))
1278     {
1279         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1280         dprintf_local( stddeb, "LOCAL_Flags(%04x,%04x): returning %04x\n",
1281                        ds, handle, pEntry->lock | (pEntry->flags << 8) );
1282         return pEntry->lock | (pEntry->flags << 8);
1283     }
1284     else
1285     {
1286         dprintf_local( stddeb, "LOCAL_Flags(%04x,%04x): returning 0\n",
1287                        ds, handle );
1288         return 0;
1289     }
1290 }
1291
1292
1293 /***********************************************************************
1294  *           LOCAL_HeapSize
1295  *
1296  * Implementation of LocalHeapSize().
1297  */
1298 WORD LOCAL_HeapSize( HANDLE16 ds )
1299 {
1300     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1301     if (!pInfo) return 0;
1302     return pInfo->last - pInfo->first;
1303 }
1304
1305
1306 /***********************************************************************
1307  *           LOCAL_CountFree
1308  *
1309  * Implementation of LocalCountFree().
1310  */
1311 WORD LOCAL_CountFree( HANDLE16 ds )
1312 {
1313     WORD arena, total;
1314     LOCALARENA *pArena;
1315     LOCALHEAPINFO *pInfo;
1316     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1317
1318     if (!(pInfo = LOCAL_GetHeap( ds )))
1319     {
1320         fprintf( stderr, "LOCAL_Handle(%04x): Local heap not found\n", ds );
1321         LOCAL_PrintHeap( ds );
1322         return 0;
1323     }
1324
1325     total = 0;
1326     arena = pInfo->first;
1327     pArena = ARENA_PTR( ptr, arena );
1328     for (;;)
1329     {
1330         arena = pArena->free_next;
1331         pArena = ARENA_PTR( ptr, arena );
1332         if (arena == pArena->free_next) break;
1333         total += pArena->size;
1334     }
1335     dprintf_local( stddeb, "LOCAL_CountFree(%04x): returning %d\n", ds, total);
1336     return total;
1337 }
1338
1339
1340 /***********************************************************************
1341  *           LOCAL_Handle
1342  *
1343  * Implementation of LocalHandle().
1344  */
1345 HLOCAL16 LOCAL_Handle( HANDLE16 ds, WORD addr )
1346 {
1347     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1348     LOCALHEAPINFO *pInfo;
1349     WORD table;
1350
1351     if (!(pInfo = LOCAL_GetHeap( ds )))
1352     {
1353         fprintf( stderr, "LOCAL_Handle(%04x): Local heap not found\n", ds );
1354         LOCAL_PrintHeap( ds );
1355         return 0;
1356     }
1357
1358     /* Find the address in the entry tables */
1359
1360     table = pInfo->htable;
1361     while (table)
1362     {
1363         WORD count = *(WORD *)(ptr + table);
1364         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1365         for (; count > 0; count--, pEntry++)
1366             if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1367         table = *(WORD *)pEntry;
1368     }
1369
1370     return (HLOCAL16)addr;  /* Fixed block handle is addr */
1371 }
1372
1373
1374 /***********************************************************************
1375  *           LocalAlloc16   (KERNEL.5)
1376  */
1377 HLOCAL16 LocalAlloc16( UINT16 flags, WORD size )
1378 {
1379     return LOCAL_Alloc( CURRENT_DS, flags, size );
1380 }
1381
1382
1383 /***********************************************************************
1384  *           LocalReAlloc16   (KERNEL.6)
1385  */
1386 HLOCAL16 LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1387 {
1388     return LOCAL_ReAlloc( CURRENT_DS, handle, size, flags );
1389 }
1390
1391
1392 /***********************************************************************
1393  *           LocalFree16   (KERNEL.7)
1394  */
1395 HLOCAL16 LocalFree16( HLOCAL16 handle )
1396 {
1397     return LOCAL_Free( CURRENT_DS, handle );
1398 }
1399
1400
1401 /***********************************************************************
1402  *           LocalLock16   (KERNEL.8)
1403  *
1404  * Note: only the offset part of the pointer is returned by the relay code.
1405  */
1406 SEGPTR LocalLock16( HLOCAL16 handle )
1407 {
1408     HANDLE16 ds = CURRENT_DS;
1409     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1410     return PTR_SEG_OFF_TO_SEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1411 }
1412
1413
1414 /***********************************************************************
1415  *           LocalUnlock16   (KERNEL.9)
1416  */
1417 BOOL16 LocalUnlock16( HLOCAL16 handle )
1418 {
1419     return LOCAL_Unlock( CURRENT_DS, handle );
1420 }
1421
1422
1423 /***********************************************************************
1424  *           LocalSize16   (KERNEL.10)
1425  */
1426 UINT16 LocalSize16( HLOCAL16 handle )
1427 {
1428     return LOCAL_Size( CURRENT_DS, handle );
1429 }
1430
1431
1432 /***********************************************************************
1433  *           LocalHandle16   (KERNEL.11)
1434  */
1435 HLOCAL16 LocalHandle16( WORD addr )
1436 {
1437     return LOCAL_Handle( CURRENT_DS, addr );
1438 }
1439
1440
1441 /***********************************************************************
1442  *           LocalFlags16   (KERNEL.12)
1443  */
1444 UINT16 LocalFlags16( HLOCAL16 handle )
1445 {
1446     return LOCAL_Flags( CURRENT_DS, handle );
1447 }
1448
1449
1450 /***********************************************************************
1451  *           LocalCompact16   (KERNEL.13)
1452  */
1453 UINT16 LocalCompact16( UINT16 minfree )
1454 {
1455     dprintf_local( stddeb, "LocalCompact: %04x\n", minfree );
1456     return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1457 }
1458
1459
1460 /***********************************************************************
1461  *           LocalNotify   (KERNEL.14)
1462  */
1463 FARPROC LocalNotify( FARPROC func )
1464 {
1465     LOCALHEAPINFO *pInfo;
1466     FARPROC oldNotify;
1467     HANDLE16 ds = CURRENT_DS;
1468
1469     if (!(pInfo = LOCAL_GetHeap( ds )))
1470     {
1471         fprintf( stderr, "LOCAL_Notify(%04x): Local heap not found\n", ds );
1472         LOCAL_PrintHeap( ds );
1473         return 0;
1474     }
1475     dprintf_local( stddeb, "LocalNotify(%04x): %08lx\n", ds, (DWORD)func );
1476     oldNotify = pInfo->notify;
1477     pInfo->notify = func;
1478     return oldNotify;
1479 }
1480
1481
1482 /***********************************************************************
1483  *           LocalShrink16   (KERNEL.121)
1484  */
1485 UINT16 LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1486 {
1487     dprintf_local( stddeb, "LocalShrink: %04x %04x\n", handle, newsize );
1488     return 0;
1489 }
1490
1491
1492 /***********************************************************************
1493  *           GetHeapSpaces   (KERNEL.138)
1494  */
1495 DWORD GetHeapSpaces( HMODULE module )
1496 {
1497     NE_MODULE *pModule;
1498     WORD ds;
1499
1500     module = GetExePtr( module );
1501     if (!(pModule = MODULE_GetPtr( module ))) return 0;
1502     ds = (NE_SEG_TABLE( pModule ) + pModule->dgroup - 1)->selector;
1503     return MAKELONG( LOCAL_CountFree( ds ), LOCAL_HeapSize( ds ) );
1504 }
1505
1506
1507 /***********************************************************************
1508  *           LocalCountFree   (KERNEL.161)
1509  */
1510 WORD LocalCountFree(void)
1511 {
1512     return LOCAL_CountFree( CURRENT_DS );
1513 }
1514
1515
1516 /***********************************************************************
1517  *           LocalHeapSize   (KERNEL.162)
1518  */
1519 WORD LocalHeapSize()
1520 {
1521     dprintf_local( stddeb, "LocalHeapSize:\n" );
1522     return LOCAL_HeapSize( CURRENT_DS );
1523 }
1524
1525
1526 /***********************************************************************
1527  *           LocalHandleDelta   (KERNEL.310)
1528  */
1529 WORD LocalHandleDelta( WORD delta )
1530 {
1531     LOCALHEAPINFO *pInfo;
1532
1533     if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1534     {
1535         fprintf( stderr, "LocalHandleDelta: Local heap not found\n");
1536         LOCAL_PrintHeap( CURRENT_DS );
1537         return 0;
1538     }
1539     if (delta) pInfo->hdelta = delta;
1540     dprintf_local(stddeb, "LocalHandleDelta: returning %04x\n", pInfo->hdelta);
1541     return pInfo->hdelta;
1542 }
1543
1544
1545 /***********************************************************************
1546  *           LocalInfo   (TOOLHELP.56)
1547  */
1548 BOOL LocalInfo( LOCALINFO *pLocalInfo, HGLOBAL handle )
1549 {
1550     LOCALHEAPINFO *pInfo = LOCAL_GetHeap(SELECTOROF(WIN16_GlobalLock16(handle)));
1551     if (!pInfo) return FALSE;
1552     pLocalInfo->wcItems = pInfo->items;
1553     return TRUE;
1554 }
1555
1556
1557 /***********************************************************************
1558  *           LocalFirst   (TOOLHELP.57)
1559  */
1560 BOOL LocalFirst( LOCALENTRY *pLocalEntry, HGLOBAL handle )
1561 {
1562     WORD ds = GlobalHandleToSel( handle );
1563     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1564     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1565     if (!pInfo) return FALSE;
1566
1567     pLocalEntry->hHandle   = pInfo->first + ARENA_HEADER_SIZE;
1568     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1569     pLocalEntry->wFlags    = LF_FIXED;
1570     pLocalEntry->wcLock    = 0;
1571     pLocalEntry->wType     = LT_NORMAL;
1572     pLocalEntry->hHeap     = handle;
1573     pLocalEntry->wHeapType = NORMAL_HEAP;
1574     pLocalEntry->wNext     = ARENA_PTR(ptr,pInfo->first)->next;
1575     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1576     return TRUE;
1577 }
1578
1579
1580 /***********************************************************************
1581  *           LocalNext   (TOOLHELP.58)
1582  */
1583 BOOL LocalNext( LOCALENTRY *pLocalEntry )
1584 {
1585     WORD ds = GlobalHandleToSel( pLocalEntry->hHeap );
1586     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1587     LOCALARENA *pArena;
1588
1589     if (!LOCAL_GetHeap( ds )) return FALSE;
1590     if (!pLocalEntry->wNext) return FALSE;
1591     pArena = ARENA_PTR( ptr, pLocalEntry->wNext );
1592
1593     pLocalEntry->hHandle   = pLocalEntry->wNext + ARENA_HEADER_SIZE;
1594     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1595     pLocalEntry->wFlags    = (pArena->prev & 3) + 1;
1596     pLocalEntry->wcLock    = 0;
1597     pLocalEntry->wType     = LT_NORMAL;
1598     if (pArena->next != pLocalEntry->wNext)  /* last one? */
1599         pLocalEntry->wNext = pArena->next;
1600     else
1601         pLocalEntry->wNext = 0;
1602     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1603     return TRUE;
1604 }
1605
1606 #ifndef WINELIB
1607
1608 #endif  /* WINELIB */
1609
1610 /***********************************************************************
1611  *           LocalAlloc32   (KERNEL32.371)
1612  */
1613 HLOCAL32 LocalAlloc32( UINT32 flags, DWORD size )
1614 {
1615     return (HLOCAL32)GlobalAlloc32( flags, size );
1616 }
1617
1618
1619 /***********************************************************************
1620  *           LocalCompact32   (KERNEL32.372)
1621  */
1622 UINT32 LocalCompact32( UINT32 minfree )
1623 {
1624     return 0;  /* LocalCompact does nothing in Win32 */
1625 }
1626
1627
1628 /***********************************************************************
1629  *           LocalFlags32   (KERNEL32.374)
1630  */
1631 UINT32 LocalFlags32( HLOCAL32 handle )
1632 {
1633     return GlobalFlags32( (HGLOBAL32)handle );
1634 }
1635
1636
1637 /***********************************************************************
1638  *           LocalFree32   (KERNEL32.375)
1639  */
1640 HLOCAL32 LocalFree32( HLOCAL32 handle )
1641 {
1642     return (HLOCAL32)GlobalFree32( (HGLOBAL32)handle );
1643 }
1644
1645
1646 /***********************************************************************
1647  *           LocalHandle32   (KERNEL32.376)
1648  */
1649 HLOCAL32 LocalHandle32( LPCVOID ptr )
1650 {
1651     return (HLOCAL32)GlobalHandle32( ptr );
1652 }
1653
1654
1655 /***********************************************************************
1656  *           LocalLock32   (KERNEL32.377)
1657  */
1658 LPVOID LocalLock32( HLOCAL32 handle )
1659 {
1660     return GlobalLock32( (HGLOBAL32)handle );
1661 }
1662
1663
1664 /***********************************************************************
1665  *           LocalReAlloc32   (KERNEL32.378)
1666  */
1667 HLOCAL32 LocalReAlloc32( HLOCAL32 handle, DWORD size, UINT32 flags )
1668 {
1669     return (HLOCAL32)GlobalReAlloc32( (HGLOBAL32)handle, size, flags );
1670 }
1671
1672
1673 /***********************************************************************
1674  *           LocalShrink32   (KERNEL32.379)
1675  */
1676 UINT32 LocalShrink32( HGLOBAL32 handle, UINT32 newsize )
1677 {
1678     return 0;  /* LocalShrink does nothing in Win32 */
1679 }
1680
1681
1682 /***********************************************************************
1683  *           LocalSize32   (KERNEL32.380)
1684  */
1685 UINT32 LocalSize32( HLOCAL32 handle )
1686 {
1687     return GlobalSize32( (HGLOBAL32)handle );
1688 }
1689
1690
1691 /***********************************************************************
1692  *           LocalUnlock32   (KERNEL32.381)
1693  */
1694 BOOL32 LocalUnlock32( HLOCAL32 handle )
1695 {
1696     return GlobalUnlock32( (HGLOBAL32)handle );
1697 }