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 "wine/winbase16.h"
  18 #include "ldt.h"
  19 #include "task.h"
  20 #include "global.h"
  21 #include "heap.h"
  22 #include "instance.h"
  23 #include "local.h"
  24 #include "module.h"
  25 #include "stackframe.h"
  26 #include "toolhelp.h"
  27 #include "debug.h"
  28 #include "callback.h"
  29
  30 typedef struct
  31 {
  32 /* Arena header */
  33     WORD prev;          /* Previous arena | arena type */
  34     WORD next;          /* Next arena */
  35 /* Start of the memory block or free-list info */
  36     WORD size;          /* Size of the free block */
  37     WORD free_prev;     /* Previous free block */
  38     WORD free_next;     /* Next free block */
  39 } LOCALARENA;
  40
  41 #define ARENA_HEADER_SIZE      4
  42 #define ARENA_HEADER( handle) ( ((handle) & ~3) - ARENA_HEADER_SIZE)
  43
  44   /* Arena types (stored in 'prev' field of the arena) */
  45 #define LOCAL_ARENA_FREE       0
  46 #define LOCAL_ARENA_FIXED      1
  47
  48 /* LocalNotify() msgs */
  49
  50 #define LN_OUTOFMEM     0
  51 #define LN_MOVE         1
  52 #define LN_DISCARD      2
  53
  54 /* Layout of a handle entry table
  55  *
  56  * WORD                     count of entries
  57  * LOCALHANDLEENTRY[count]  entries
  58  * WORD                     near ptr to next table
  59  */
  60 typedef struct
  61 {
  62     WORD addr;                /* Address of the MOVEABLE block */
  63     BYTE flags;               /* Flags for this block */
  64     BYTE lock;                /* Lock count */
  65 } LOCALHANDLEENTRY;
  66
  67 /*
  68  * We make addr = 4n + 2 and set *((WORD *)addr - 1) = &addr like Windows does
  69  * in case something actually relies on this.
  70  * Note the ARENA_HEADER(addr) still produces the desired result ie. 4n - 4
  71  *
  72  * An unused handle has lock = flags = 0xff. In windows addr is that of next
  73  * free handle, at the moment in wine we set it to 0.
  74  *
  75  * A discarded block's handle has lock = addr = 0 and flags = 0x40
  76  * (LMEM_DISCARDED >> 8)
  77  */
  78
  79 #pragma pack(1)
  80
  81 typedef struct
  82 {
  83     WORD check;                 /* 00 Heap checking flag */
  84     WORD freeze;                /* 02 Heap frozen flag */
  85     WORD items;                 /* 04 Count of items on the heap */
  86     WORD first;                 /* 06 First item of the heap */
  87     WORD pad1;                  /* 08 Always 0 */
  88     WORD last;                  /* 0a Last item of the heap */
  89     WORD pad2;                  /* 0c Always 0 */
  90     BYTE ncompact;              /* 0e Compactions counter */
  91     BYTE dislevel;              /* 0f Discard level */
  92     DWORD distotal;             /* 10 Total bytes discarded */
  93     WORD htable;                /* 14 Pointer to handle table */
  94     WORD hfree;                 /* 16 Pointer to free handle table */
  95     WORD hdelta;                /* 18 Delta to expand the handle table */
  96     WORD expand;                /* 1a Pointer to expand function (unused) */
  97     WORD pstat;                 /* 1c Pointer to status structure (unused) */
  98     FARPROC16 notify WINE_PACKED; /* 1e Pointer to LocalNotify() function */
  99     WORD lock;                  /* 22 Lock count for the heap */
 100     WORD extra;                 /* 24 Extra bytes to allocate when expanding */
 101     WORD minsize;               /* 26 Minimum size of the heap */
 102     WORD magic;                 /* 28 Magic number */
 103 } LOCALHEAPINFO;
 104
 105 #pragma pack(4)
 106
 107 #define LOCAL_HEAP_MAGIC  0x484c  /* 'LH' */
 108
 109 WORD USER_HeapSel = 0;  /* USER heap selector */
 110 WORD GDI_HeapSel = 0;   /* GDI heap selector */
 111
 112   /* All local heap allocations are aligned on 4-byte boundaries */
 113 #define LALIGN(word)          (((word) + 3) & ~3)
 114
 115 #define ARENA_PTR(ptr,arena)       ((LOCALARENA *)((char*)(ptr)+(arena)))
 116 #define ARENA_PREV(ptr,arena)      (ARENA_PTR((ptr),(arena))->prev & ~3)
 117 #define ARENA_NEXT(ptr,arena)      (ARENA_PTR((ptr),(arena))->next)
 118 #define ARENA_FLAGS(ptr,arena)     (ARENA_PTR((ptr),(arena))->prev & 3)
 119
 120   /* determine whether the handle belongs to a fixed or a moveable block */
 121 #define HANDLE_FIXED(handle) (((handle) & 3) == 0)
 122 #define HANDLE_MOVEABLE(handle) (((handle) & 3) == 2)
 123
 124 /***********************************************************************
 125  *           LOCAL_GetHeap
 126  *
 127  * Return a pointer to the local heap, making sure it exists.
 128  */
 129 static LOCALHEAPINFO *LOCAL_GetHeap( HANDLE16 ds )
 130 {
 131     LOCALHEAPINFO *pInfo;
 132     INSTANCEDATA *ptr = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( ds, 0 );
 133     TRACE(local, "Heap at %p, %04x\n", ptr, (ptr != NULL ? ptr->heap : 0xFFFF));
 134     if (!ptr || !ptr->heap) return NULL;
 135     if (IsBadReadPtr16( (SEGPTR)MAKELONG(ptr->heap,ds), sizeof(LOCALHEAPINFO)))
 136         return NULL;
 137     pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
 138     if (pInfo->magic != LOCAL_HEAP_MAGIC) return NULL;
 139     return pInfo;
 140 }
 141
 142
 143 /***********************************************************************
 144  *           LOCAL_MakeBlockFree
 145  *
 146  * Make a block free, inserting it in the free-list.
 147  * 'block' is the handle of the block arena; 'baseptr' points to
 148  * the beginning of the data segment containing the heap.
 149  */
 150 static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
 151 {
 152     LOCALARENA *pArena, *pNext;
 153     WORD next;
 154
 155       /* Mark the block as free */
 156
 157     pArena = ARENA_PTR( baseptr, block );
 158     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
 159     pArena->size = pArena->next - block;
 160
 161       /* Find the next free block (last block is always free) */
 162
 163     next = pArena->next;
 164     for (;;)
 165     {
 166         pNext = ARENA_PTR( baseptr, next );
 167         if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
 168         next = pNext->next;
 169     }
 170
 171     TRACE(local, "Local_MakeBlockFree %04x, next %04x\n", block, next );
 172       /* Insert the free block in the free-list */
 173
 174     pArena->free_prev = pNext->free_prev;
 175     pArena->free_next = next;
 176     ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
 177     pNext->free_prev  = block;
 178 }
 179
 180
 181 /***********************************************************************
 182  *           LOCAL_RemoveFreeBlock
 183  *
 184  * Remove a block from the free-list.
 185  * 'block' is the handle of the block arena; 'baseptr' points to
 186  * the beginning of the data segment containing the heap.
 187  */
 188 static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
 189 {
 190       /* Mark the block as fixed */
 191
 192     LOCALARENA *pArena = ARENA_PTR( baseptr, block );
 193     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
 194
 195       /* Remove it from the list */
 196
 197     ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
 198     ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
 199 }
 200
 201
 202 /***********************************************************************
 203  *           LOCAL_AddBlock
 204  *
 205  * Insert a new block in the heap.
 206  * 'new' is the handle of the new block arena; 'baseptr' points to
 207  * the beginning of the data segment containing the heap; 'prev' is
 208  * the block before the new one.
 209  */
 210 static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
 211 {
 212     LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
 213     LOCALARENA *pNew  = ARENA_PTR( baseptr, new );
 214
 215     pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
 216     pNew->next = pPrev->next;
 217     ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
 218     ARENA_PTR(baseptr,pPrev->next)->prev |= new;
 219     pPrev->next = new;
 220 }
 221
 222
 223 /***********************************************************************
 224  *           LOCAL_RemoveBlock
 225  *
 226  * Remove a block from the heap.
 227  * 'block' is the handle of the block arena; 'baseptr' points to
 228  * the beginning of the data segment containing the heap.
 229  */
 230 static void LOCAL_RemoveBlock( char *baseptr, WORD block )
 231 {
 232     LOCALARENA *pArena, *pTmp;
 233
 234       /* Remove the block from the free-list */
 235
 236     TRACE(local, "Local_RemoveBlock\n");
 237     pArena = ARENA_PTR( baseptr, block );
 238     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 239         LOCAL_RemoveFreeBlock( baseptr, block );
 240
 241       /* If the previous block is free, expand its size */
 242
 243     pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
 244     if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
 245         pTmp->size += pArena->next - block;
 246
 247       /* Remove the block from the linked list */
 248
 249     pTmp->next = pArena->next;
 250     pTmp = ARENA_PTR( baseptr, pArena->next );
 251     pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
 252 }
 253
 254
 255 /***********************************************************************
 256  *           LOCAL_PrintHeap
 257  */
 258 static void LOCAL_PrintHeap( HANDLE16 ds )
 259 {
 260     char *ptr;
 261     LOCALHEAPINFO *pInfo;
 262     WORD arena;
 263
 264     /* FIXME - the test should be done when calling the function!
 265                plus is not clear that we should print this info
 266                only when TRACE_ON is on! */
 267     if(!TRACE_ON(local)) return;
 268
 269     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 270     pInfo = LOCAL_GetHeap( ds );
 271
 272     if (!pInfo)
 273     {
 274         DUMP( "Local Heap corrupted!  ds=%04x\n", ds );
 275         return;
 276     }
 277     DUMP( "Local Heap  ds=%04x first=%04x last=%04x items=%d\n",
 278           ds, pInfo->first, pInfo->last, pInfo->items );
 279
 280     arena = pInfo->first;
 281     for (;;)
 282     {
 283         LOCALARENA *pArena = ARENA_PTR(ptr,arena);
 284         DUMP( "  %04x: prev=%04x next=%04x type=%d\n", arena,
 285               pArena->prev & ~3, pArena->next, pArena->prev & 3 );
 286         if (arena == pInfo->first)
 287         {
 288             DUMP( "        size=%d free_prev=%04x free_next=%04x\n",
 289                   pArena->size, pArena->free_prev, pArena->free_next );
 290         }
 291         if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 292         {
 293             DUMP( "        size=%d free_prev=%04x free_next=%04x\n",
 294                   pArena->size, pArena->free_prev, pArena->free_next );
 295             if (pArena->next == arena) break;  /* last one */
 296             if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
 297             {
 298                 DUMP( "*** arena->free_next->free_prev != arena\n" );
 299                 break;
 300             }
 301         }
 302         if (pArena->next == arena)
 303         {
 304             DUMP( "*** last block is not marked free\n" );
 305             break;
 306         }
 307         if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
 308         {
 309             DUMP( "*** arena->next->prev != arena (%04x, %04x)\n",
 310                   pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
 311             break;
 312         }
 313         arena = pArena->next;
 314     }
 315 }
 316
 317
 318 /***********************************************************************
 319  *           LocalInit   (KERNEL.4)
 320  */
 321 BOOL16 WINAPI LocalInit16( HANDLE16 selector, WORD start, WORD end )
 322 {
 323     char *ptr;
 324     WORD heapInfoArena, freeArena, lastArena;
 325     LOCALHEAPINFO *pHeapInfo;
 326     LOCALARENA *pArena, *pFirstArena, *pLastArena;
 327     NE_MODULE *pModule;
 328
 329       /* The initial layout of the heap is: */
 330       /* - first arena         (FIXED)      */
 331       /* - heap info structure (FIXED)      */
 332       /* - large free block    (FREE)       */
 333       /* - last arena          (FREE)       */
 334
 335     TRACE(local, "%04x %04x-%04x\n", selector, start, end);
 336     if (!selector) selector = CURRENT_DS;
 337
 338     if (TRACE_ON(heap))
 339     {
 340         /* If TRACE_ON(heap) is set, the global heap blocks are */
 341         /* cleared before use, so we can test for double initialization. */
 342         if (LOCAL_GetHeap(selector))
 343         {
 344             ERR(local, "Heap %04x initialized twice.\n", selector);
 345             LOCAL_PrintHeap(selector);
 346         }
 347     }
 348
 349     if (start == 0) {
 350       /* Check if the segment is the DGROUP of a module */
 351
 352         if ((pModule = NE_GetPtr( selector )))
 353         {
 354             SEGTABLEENTRY *pSeg = NE_SEG_TABLE( pModule ) + pModule->dgroup - 1;
 355             if (pModule->dgroup && (GlobalHandleToSel16(pSeg->hSeg) == selector))
 356             {
 357                 /* We can't just use the simple method of using the value
 358                  * of minsize + stacksize, since there are programs that
 359                  * resize the data segment before calling InitTask(). So,
 360                  * we must put it at the end of the segment */
 361                 start = GlobalSize16( GlobalHandle16( selector ) );
 362                 start -= end;
 363                 end += start;
 364                 TRACE(local," new start %04x, minstart: %04x\n", start, pSeg->minsize + pModule->stack_size);
 365             }
 366         }
 367     }
 368     ptr = PTR_SEG_OFF_TO_LIN( selector, 0 );
 369
 370     start = LALIGN( MAX( start, sizeof(INSTANCEDATA) ) );
 371     heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
 372     freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
 373                         + sizeof(LOCALHEAPINFO) );
 374     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 375
 376       /* Make sure there's enough space.       */
 377
 378     if (freeArena + sizeof(LOCALARENA) >= lastArena) return FALSE;
 379
 380       /* Initialise the first arena */
 381
 382     pFirstArena = ARENA_PTR( ptr, start );
 383     pFirstArena->prev      = start | LOCAL_ARENA_FIXED;
 384     pFirstArena->next      = heapInfoArena;
 385     pFirstArena->size      = LALIGN(sizeof(LOCALARENA));
 386     pFirstArena->free_prev = start;  /* this one */
 387     pFirstArena->free_next = freeArena;
 388
 389       /* Initialise the arena of the heap info structure */
 390
 391     pArena = ARENA_PTR( ptr, heapInfoArena );
 392     pArena->prev = start | LOCAL_ARENA_FIXED;
 393     pArena->next = freeArena;
 394
 395       /* Initialise the heap info structure */
 396
 397     pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
 398     memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
 399     pHeapInfo->items   = 4;
 400     pHeapInfo->first   = start;
 401     pHeapInfo->last    = lastArena;
 402     pHeapInfo->htable  = 0;
 403     pHeapInfo->hdelta  = 0x20;
 404     pHeapInfo->extra   = 0x200;
 405     pHeapInfo->minsize = lastArena - freeArena;
 406     pHeapInfo->magic   = LOCAL_HEAP_MAGIC;
 407
 408       /* Initialise the large free block */
 409
 410     pArena = ARENA_PTR( ptr, freeArena );
 411     pArena->prev      = heapInfoArena | LOCAL_ARENA_FREE;
 412     pArena->next      = lastArena;
 413     pArena->size      = lastArena - freeArena;
 414     pArena->free_prev = start;
 415     pArena->free_next = lastArena;
 416
 417       /* Initialise the last block */
 418
 419     pLastArena = ARENA_PTR( ptr, lastArena );
 420     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 421     pLastArena->next      = lastArena;  /* this one */
 422     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 423     pLastArena->free_prev = freeArena;
 424     pLastArena->free_next = lastArena;  /* this one */
 425
 426       /* Store the local heap address in the instance data */
 427
 428     ((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
 429     LOCAL_PrintHeap( selector );
 430     return TRUE;
 431 }
 432
 433 /***********************************************************************
 434  *           LOCAL_GrowHeap
 435  */
 436 static BOOL16 LOCAL_GrowHeap( HANDLE16 ds )
 437 {
 438     HANDLE16 hseg;
 439     LONG oldsize;
 440     LONG end;
 441     LOCALHEAPINFO *pHeapInfo;
 442     WORD freeArena, lastArena;
 443     LOCALARENA *pArena, *pLastArena;
 444     char *ptr;
 445
 446     hseg = GlobalHandle16( ds );
 447     /* maybe mem allocated by Virtual*() ? */
 448     if (!hseg) return FALSE;
 449
 450     oldsize = GlobalSize16( hseg );
 451     /* if nothing can be gained, return */
 452     if (oldsize > 0xfff0) return FALSE;
 453     hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
 454     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 455     pHeapInfo = LOCAL_GetHeap( ds );
 456     if (pHeapInfo == NULL) {
 457         ERR(local, "Heap not found\n" );
 458         return FALSE;
 459     }
 460     end = GlobalSize16( hseg );
 461     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 462
 463       /* Update the HeapInfo */
 464     pHeapInfo->items++;
 465     freeArena = pHeapInfo->last;
 466     pHeapInfo->last = lastArena;
 467     pHeapInfo->minsize += end - oldsize;
 468
 469       /* grow the old last block */
 470     pArena = ARENA_PTR( ptr, freeArena );
 471     pArena->size      = lastArena - freeArena;
 472     pArena->next      = lastArena;
 473     pArena->free_next = lastArena;
 474
 475       /* Initialise the new last block */
 476
 477     pLastArena = ARENA_PTR( ptr, lastArena );
 478     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 479     pLastArena->next      = lastArena;  /* this one */
 480     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 481     pLastArena->free_prev = freeArena;
 482     pLastArena->free_next = lastArena;  /* this one */
 483
 484     /* If block before freeArena is also free then merge them */
 485     if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
 486     {
 487         LOCAL_RemoveBlock(ptr, freeArena);
 488         pHeapInfo->items--;
 489     }
 490
 491     TRACE(local, "Heap expanded\n" );
 492     LOCAL_PrintHeap( ds );
 493     return TRUE;
 494 }
 495
 496
 497 /***********************************************************************
 498  *           LOCAL_FreeArena
 499  */
 500 static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
 501 {
 502     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 503     LOCALHEAPINFO *pInfo;
 504     LOCALARENA *pArena, *pPrev, *pNext;
 505
 506     TRACE(local, "%04x ds=%04x\n", arena, ds );
 507     if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
 508
 509     pArena = ARENA_PTR( ptr, arena );
 510     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 511     {
 512         /* shouldn't happen */
 513         ERR(local, "Trying to free block %04x twice!\n",
 514                  arena );
 515         LOCAL_PrintHeap( ds );
 516         return arena;
 517     }
 518
 519       /* Check if we can merge with the previous block */
 520
 521     pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
 522     pNext = ARENA_PTR( ptr, pArena->next );
 523     if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
 524     {
 525         arena  = pArena->prev & ~3;
 526         pArena = pPrev;
 527         LOCAL_RemoveBlock( ptr, pPrev->next );
 528         pInfo->items--;
 529     }
 530     else  /* Make a new free block */
 531     {
 532         LOCAL_MakeBlockFree( ptr, arena );
 533     }
 534
 535       /* Check if we can merge with the next block */
 536
 537     if ((pArena->next == pArena->free_next) &&
 538         (pArena->next != pInfo->last))
 539     {
 540         LOCAL_RemoveBlock( ptr, pArena->next );
 541         pInfo->items--;
 542     }
 543     return 0;
 544 }
 545
 546
 547 /***********************************************************************
 548  *           LOCAL_ShrinkArena
 549  *
 550  * Shrink an arena by creating a free block at its end if possible.
 551  * 'size' includes the arena header, and must be aligned.
 552  */
 553 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
 554 {
 555     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 556     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 557
 558     if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
 559     {
 560         LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
 561         if (!pInfo) return;
 562         LOCAL_AddBlock( ptr, arena, arena + size );
 563         pInfo->items++;
 564         LOCAL_FreeArena( ds, arena + size );
 565     }
 566 }
 567
 568
 569 /***********************************************************************
 570  *           LOCAL_GrowArenaDownward
 571  *
 572  * Grow an arena downward by using the previous arena (must be free).
 573  */
 574 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
 575 {
 576     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 577     LOCALHEAPINFO *pInfo;
 578     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 579     WORD prevArena = pArena->prev & ~3;
 580     LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
 581     WORD offset, size;
 582     char *p;
 583
 584     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 585     offset = pPrevArena->size;
 586     size = pArena->next - arena - ARENA_HEADER_SIZE;
 587     LOCAL_RemoveFreeBlock( ptr, prevArena );
 588     LOCAL_RemoveBlock( ptr, arena );
 589     pInfo->items--;
 590     p = (char *)pPrevArena + ARENA_HEADER_SIZE;
 591     while (offset < size)
 592     {
 593         memcpy( p, p + offset, offset );
 594         p += offset;
 595         size -= offset;
 596     }
 597     if (size) memcpy( p, p + offset, size );
 598     LOCAL_ShrinkArena( ds, prevArena, newsize );
 599 }
 600
 601
 602
 603 /***********************************************************************
 604  *           LOCAL_GrowArenaUpward
 605  *
 606  * Grow an arena upward by using the next arena (must be free and big
 607  * enough). Newsize includes the arena header and must be aligned.
 608  */
 609 static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
 610 {
 611     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 612     LOCALHEAPINFO *pInfo;
 613     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 614     WORD nextArena = pArena->next;
 615
 616     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 617     LOCAL_RemoveBlock( ptr, nextArena );
 618     pInfo->items--;
 619     LOCAL_ShrinkArena( ds, arena, newsize );
 620 }
 621
 622
 623 /***********************************************************************
 624  *           LOCAL_GetFreeSpace
 625  */
 626 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
 627 {
 628     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 629     LOCALHEAPINFO *pInfo;
 630     LOCALARENA *pArena;
 631     WORD arena;
 632     WORD freespace = 0;
 633
 634     if (!(pInfo = LOCAL_GetHeap( ds )))
 635     {
 636         ERR(local, "Local heap not found\n" );
 637         LOCAL_PrintHeap(ds);
 638         return 0;
 639     }
 640     arena = pInfo->first;
 641     pArena = ARENA_PTR( ptr, arena );
 642     while (arena != pArena->free_next)
 643     {
 644         arena = pArena->free_next;
 645         pArena = ARENA_PTR( ptr, arena );
 646         if (pArena->size >= freespace) freespace = pArena->size;
 647     }
 648     /* FIXME doesn't yet calculate space that would become free if everything
 649        were discarded when countdiscard == 1 */
 650     if (freespace < ARENA_HEADER_SIZE) freespace = 0;
 651     else freespace -= ARENA_HEADER_SIZE;
 652     return freespace;
 653 }
 654
 655
 656 /***********************************************************************
 657  *           LOCAL_Compact
 658  */
 659 WORD LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
 660 {
 661     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 662     LOCALHEAPINFO *pInfo;
 663     LOCALARENA *pArena, *pMoveArena, *pFinalArena;
 664     WORD arena, movearena, finalarena, table;
 665     WORD count, movesize, size;
 666     WORD freespace;
 667     LOCALHANDLEENTRY *pEntry;
 668
 669     if (!(pInfo = LOCAL_GetHeap( ds )))
 670     {
 671         ERR(local, "Local heap not found\n" );
 672         LOCAL_PrintHeap(ds);
 673         return 0;
 674     }
 675     TRACE(local, "ds = %04x, minfree = %04x, flags = %04x\n",
 676                  ds, minfree, flags);
 677     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 678     if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
 679     {
 680         TRACE(local, "Returning %04x.\n", freespace);
 681         return freespace;
 682     }
 683     TRACE(local, "Compacting heap %04x.\n", ds);
 684     table = pInfo->htable;
 685     while(table)
 686     {
 687         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 688         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 689         {
 690             if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
 691             {
 692                 /* OK we can move this one if we want */
 693                 TRACE(local, "handle %04x (block %04x) can be moved.\n",
 694                              (WORD)((char *)pEntry - ptr), pEntry->addr);
 695                 movearena = ARENA_HEADER(pEntry->addr);
 696                 pMoveArena = ARENA_PTR(ptr, movearena);
 697                 movesize = pMoveArena->next - movearena;
 698                 arena = pInfo->first;
 699                 pArena = ARENA_PTR(ptr, arena);
 700                 size = 0xffff;
 701                 finalarena = 0;
 702                 /* Try to find the smallest arena that will do, */
 703                 /* which is below us in memory */
 704                 for(;;)
 705                 {
 706                     arena = pArena->free_next;
 707                     pArena = ARENA_PTR(ptr, arena);
 708                     if(arena >= movearena)
 709                         break;
 710                     if(arena == pArena->free_next)
 711                         break;
 712                     if((pArena->size >= movesize) && (pArena->size < size))
 713                     {
 714                         size = pArena->size;
 715                         finalarena = arena;
 716                     }
 717                 }
 718                 if (finalarena) /* Actually got somewhere to move */
 719                 {
 720                     TRACE(local, "Moving it to %04x.\n", finalarena);
 721                     pFinalArena = ARENA_PTR(ptr, finalarena);
 722                     size = pFinalArena->size;
 723                     LOCAL_RemoveFreeBlock(ptr, finalarena);
 724                     LOCAL_ShrinkArena( ds, finalarena, movesize );
 725                     /* Copy the arena to it's new location */
 726                     memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
 727                            (char *)pMoveArena + ARENA_HEADER_SIZE,
 728                            movesize - ARENA_HEADER_SIZE );
 729                     /* Free the old location */
 730                     LOCAL_FreeArena(ds, movearena);
 731                     if (pInfo->notify)
 732                         Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_MOVE,
 733                         (WORD)((char *)pEntry - ptr), pEntry->addr);
 734                     /* Update handle table entry */
 735                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 736                 }
 737                 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
 738                                == LOCAL_ARENA_FREE)
 739                 {
 740                     /* Previous arena is free (but < movesize)  */
 741                     /* so we can 'slide' movearena down into it */
 742                     finalarena = pMoveArena->prev & ~3;
 743                     LOCAL_GrowArenaDownward( ds, movearena, movesize );
 744                     /* Update handle table entry */
 745                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 746                 }
 747             }
 748         }
 749         table = *(WORD *)pEntry;
 750     }
 751     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 752     if(freespace >= minfree || (flags & LMEM_NODISCARD))
 753     {
 754         TRACE(local, "Returning %04x.\n", freespace);
 755         return freespace;
 756     }
 757
 758     table = pInfo->htable;
 759     while(table)
 760     {
 761         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 762         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 763         {
 764             if(pEntry->addr && pEntry->lock == 0 &&
 765              (pEntry->flags & (LMEM_DISCARDABLE >> 8)))
 766             {
 767                 TRACE(local, "Discarding handle %04x (block %04x).\n",
 768                               (char *)pEntry - ptr, pEntry->addr);
 769                 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
 770                 if (pInfo->notify)
 771                     Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_DISCARD,
 772                         (char *)pEntry - ptr, pEntry->flags);
 773                 pEntry->addr = 0;
 774                 pEntry->flags = (LMEM_DISCARDED >> 8);
 775             }
 776         }
 777         table = *(WORD *)pEntry;
 778     }
 779     return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
 780 }
 781
 782
 783 /***********************************************************************
 784  *           LOCAL_FindFreeBlock
 785  */
 786 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
 787 {
 788     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 789     LOCALHEAPINFO *pInfo;
 790     LOCALARENA *pArena;
 791     WORD arena;
 792
 793     if (!(pInfo = LOCAL_GetHeap( ds )))
 794     {
 795         ERR(local, "Local heap not found\n" );
 796         LOCAL_PrintHeap(ds);
 797         return 0;
 798     }
 799
 800     arena = pInfo->first;
 801     pArena = ARENA_PTR( ptr, arena );
 802     for (;;) {
 803         arena = pArena->free_next;
 804         pArena = ARENA_PTR( ptr, arena );
 805         if (arena == pArena->free_next) break;
 806         if (pArena->size >= size) return arena;
 807     }
 808     TRACE(local, "not enough space\n" );
 809     LOCAL_PrintHeap(ds);
 810     return 0;
 811 }
 812
 813 /***********************************************************************
 814  *           LOCAL_GetBlock
 815  * The segment may get moved around in this function, so all callers
 816  * should reset their pointer variables.
 817  */
 818 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
 819 {
 820     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 821     LOCALHEAPINFO *pInfo;
 822     LOCALARENA *pArena;
 823     WORD arena;
 824
 825     if (!(pInfo = LOCAL_GetHeap( ds )))
 826     {
 827         ERR(local, "Local heap not found\n");
 828         LOCAL_PrintHeap(ds);
 829         return 0;
 830     }
 831
 832     size += ARENA_HEADER_SIZE;
 833     size = LALIGN( MAX( size, sizeof(LOCALARENA) ) );
 834
 835 #if 0
 836 notify_done:
 837 #endif
 838       /* Find a suitable free block */
 839     arena = LOCAL_FindFreeBlock( ds, size );
 840     if (arena == 0) {
 841         /* no space: try to make some */
 842         LOCAL_Compact( ds, size, flags );
 843         arena = LOCAL_FindFreeBlock( ds, size );
 844     }
 845     if (arena == 0) {
 846         /* still no space: try to grow the segment */
 847         if (!(LOCAL_GrowHeap( ds )))
 848         {
 849 #if 0
 850             /* FIXME: doesn't work correctly yet */
 851             if ((pInfo->notify) && (Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_OUTOFMEM, ds - 20, size))) /* FIXME: "size" correct ? (should indicate bytes needed) */
 852                 goto notify_done;
 853 #endif
 854             return 0;
 855         }
 856         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 857         pInfo = LOCAL_GetHeap( ds );
 858         arena = LOCAL_FindFreeBlock( ds, size );
 859     }
 860     if (arena == 0) {
 861         if (ds == GDI_HeapSel) {
 862             ERR(local, "not enough space in GDI local heap "
 863                          "(%04x) for %d bytes\n", ds, size );
 864         } else if (ds == USER_HeapSel) {
 865             ERR(local, "not enough space in USER local heap "
 866                          "(%04x) for %d bytes\n", ds, size );
 867         } else {
 868             ERR(local, "not enough space in local heap "
 869                          "%04x for %d bytes\n", ds, size );
 870         }
 871 #if 0
 872         if ((pInfo->notify) &&
 873         /* FIXME: "size" correct ? (should indicate bytes needed) */
 874         (Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_OUTOFMEM, ds, size)))
 875             goto notify_done;
 876 #endif
 877         return 0;
 878     }
 879
 880       /* Make a block out of the free arena */
 881     pArena = ARENA_PTR( ptr, arena );
 882     TRACE(local, "LOCAL_GetBlock size = %04x, arena %04x size %04x\n",
 883                   size, arena, pArena->size );
 884     LOCAL_RemoveFreeBlock( ptr, arena );
 885     LOCAL_ShrinkArena( ds, arena, size );
 886
 887     if (flags & LMEM_ZEROINIT)
 888         memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
 889     return arena + ARENA_HEADER_SIZE;
 890 }
 891
 892
 893 /***********************************************************************
 894  *           LOCAL_NewHTable
 895  */
 896 static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
 897 {
 898     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 899     LOCALHEAPINFO *pInfo;
 900     LOCALHANDLEENTRY *pEntry;
 901     HLOCAL16 handle;
 902     int i;
 903
 904     TRACE(local, "Local_NewHTable\n" );
 905     if (!(pInfo = LOCAL_GetHeap( ds )))
 906     {
 907         ERR(local, "Local heap not found\n");
 908         LOCAL_PrintHeap(ds);
 909         return FALSE;
 910     }
 911
 912     if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
 913                                    + 2 * sizeof(WORD), LMEM_FIXED )))
 914         return FALSE;
 915     if (!(ptr = PTR_SEG_OFF_TO_LIN( ds, 0 )))
 916         ERR(local, "ptr == NULL after GetBlock.\n");
 917     if (!(pInfo = LOCAL_GetHeap( ds )))
 918         ERR(local,"pInfo == NULL after GetBlock.\n");
 919
 920     /* Fill the entry table */
 921
 922     *(WORD *)(ptr + handle) = pInfo->hdelta;
 923     pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
 924     for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
 925         pEntry->lock = pEntry->flags = 0xff;
 926         pEntry->addr = 0;
 927     }
 928     *(WORD *)pEntry = pInfo->htable;
 929     pInfo->htable = handle;
 930     return TRUE;
 931 }
 932
 933
 934 /***********************************************************************
 935  *           LOCAL_GetNewHandleEntry
 936  */
 937 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
 938 {
 939     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 940     LOCALHEAPINFO *pInfo;
 941     LOCALHANDLEENTRY *pEntry = NULL;
 942     WORD table;
 943
 944     if (!(pInfo = LOCAL_GetHeap( ds )))
 945     {
 946         ERR(local, "Local heap not found\n");
 947         LOCAL_PrintHeap(ds);
 948         return 0;
 949     }
 950
 951     /* Find a free slot in existing tables */
 952
 953     table = pInfo->htable;
 954     while (table)
 955     {
 956         WORD count = *(WORD *)(ptr + table);
 957         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 958         for (; count > 0; count--, pEntry++)
 959             if (pEntry->lock == 0xff) break;
 960         if (count) break;
 961         table = *(WORD *)pEntry;
 962     }
 963
 964     if (!table)  /* We need to create a new table */
 965     {
 966         if (!LOCAL_NewHTable( ds )) return 0;
 967         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 968         pInfo = LOCAL_GetHeap( ds );
 969         pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
 970     }
 971
 972     /* Now allocate this entry */
 973
 974     pEntry->lock = 0;
 975     pEntry->flags = 0;
 976     TRACE(local, "(%04x): %04x\n",
 977                    ds, ((char *)pEntry - ptr) );
 978     return (HLOCAL16)((char *)pEntry - ptr);
 979 }
 980
 981
 982 /***********************************************************************
 983  *           LOCAL_FreeHandleEntry
 984  *
 985  * Free a handle table entry.
 986  */
 987 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
 988 {
 989     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 990     LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
 991     LOCALHEAPINFO *pInfo;
 992     WORD *pTable;
 993     WORD table, count, i;
 994
 995     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 996
 997     /* Find the table where this handle comes from */
 998
 999     pTable = &pInfo->htable;
1000     while (*pTable)
1001     {
1002         WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
1003         if ((handle >= *pTable + sizeof(WORD)) &&
1004             (handle < *pTable + sizeof(WORD) + size)) break;  /* Found it */
1005         pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
1006     }
1007     if (!*pTable)
1008     {
1009         ERR(local, "Invalid entry %04x\n", handle);
1010         LOCAL_PrintHeap( ds );
1011         return;
1012     }
1013
1014     /* Make the entry free */
1015
1016     pEntry->addr = 0;  /* just in case */
1017     pEntry->lock = 0xff;
1018     pEntry->flags = 0xff;
1019     /* Now check if all entries in this table are free */
1020
1021     table = *pTable;
1022     pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1023     count = *(WORD *)(ptr + table);
1024     for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
1025
1026     /* Remove the table from the linked list and free it */
1027
1028     TRACE(local, "(%04x): freeing table %04x\n",
1029                    ds, table);
1030     *pTable = *(WORD *)pEntry;
1031     LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
1032 }
1033
1034
1035 /***********************************************************************
1036  *           LOCAL_Free
1037  *
1038  * Implementation of LocalFree().
1039  */
1040 HLOCAL16 LOCAL_Free( HANDLE16 ds, HLOCAL16 handle )
1041 {
1042     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1043
1044     TRACE(local, "%04x ds=%04x\n", handle, ds );
1045
1046     if (!handle) { WARN(local, "Handle is 0.\n" ); return 0; }
1047     if (HANDLE_FIXED( handle ))
1048     {
1049         if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0;  /* OK */
1050         else return handle;  /* couldn't free it */
1051     }
1052     else
1053     {
1054         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1055         if (pEntry->flags != (LMEM_DISCARDED >> 8))
1056         {
1057             TRACE(local, "real block at %04x\n",
1058                            pEntry->addr );
1059             if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr) ))
1060                 return handle; /* couldn't free it */
1061         }
1062         LOCAL_FreeHandleEntry( ds, handle );
1063         return 0;  /* OK */
1064     }
1065 }
1066
1067
1068 /***********************************************************************
1069  *           LOCAL_Alloc
1070  *
1071  * Implementation of LocalAlloc().
1072  *
1073  */
1074 HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD flags, WORD size )
1075 {
1076     char *ptr;
1077     HLOCAL16 handle;
1078
1079     TRACE(local, "%04x %d ds=%04x\n", flags, size, ds );
1080
1081     if(size > 0 && size <= 4) size = 5;
1082     if (flags & LMEM_MOVEABLE)
1083     {
1084         LOCALHANDLEENTRY *plhe;
1085         HLOCAL16 hmem;
1086
1087         if(size)
1088         {
1089             if (!(hmem = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags )))
1090                 return 0;
1091         }
1092         else /* We just need to allocate a discarded handle */
1093             hmem = 0;
1094         if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1095         {
1096             WARN(local, "Couldn't get handle.\n");
1097             if(hmem)
1098                 LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1099             return 0;
1100         }
1101         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1102         plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1103         plhe->lock = 0;
1104         if(hmem)
1105         {
1106             plhe->addr = hmem + sizeof(HLOCAL16);
1107             plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
1108             *(HLOCAL16 *)(ptr + hmem) = handle;
1109         }
1110         else
1111         {
1112             plhe->addr = 0;
1113             plhe->flags = LMEM_DISCARDED >> 8;
1114         }
1115     }
1116     else /* FIXED */
1117     {
1118         if(!size)
1119             return 0;
1120         handle = LOCAL_GetBlock( ds, size, flags );
1121     }
1122     return handle;
1123 }
1124
1125
1126 /***********************************************************************
1127  *           LOCAL_ReAlloc
1128  *
1129  * Implementation of LocalReAlloc().
1130  */
1131 HLOCAL16 LOCAL_ReAlloc( HANDLE16 ds, HLOCAL16 handle, WORD size, WORD flags )
1132 {
1133     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1134     LOCALHEAPINFO *pInfo;
1135     LOCALARENA *pArena, *pNext;
1136     LOCALHANDLEENTRY *pEntry = NULL;
1137     WORD arena, oldsize;
1138     HLOCAL16 hmem, blockhandle;
1139     LONG nextarena;
1140
1141     if (!handle) return 0;
1142     if(HANDLE_MOVEABLE(handle) &&
1143      ((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
1144         return 0;
1145
1146     TRACE(local, "%04x %d %04x ds=%04x\n",
1147                    handle, size, flags, ds );
1148     if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1149
1150     if (HANDLE_FIXED( handle ))
1151         blockhandle = handle;
1152     else
1153     {
1154         pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1155         if(pEntry->flags == (LMEM_DISCARDED >> 8))
1156         {
1157             HLOCAL16 hl;
1158             if(pEntry->addr)
1159                 WARN(local,"Dicarded block has non-zero addr.\n");
1160             TRACE(local, "ReAllocating discarded block\n");
1161             if(size <= 4) size = 5;
1162             if (!(hl = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags)))
1163                 return 0;
1164             ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1165             pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1166             pEntry->addr = hl + sizeof(HLOCAL16);
1167             pEntry->flags = 0;
1168             pEntry->lock = 0;
1169             *(HLOCAL16 *)(ptr + hl) = handle;
1170             return handle;
1171         }
1172         if (((blockhandle = pEntry->addr) & 3) != 2)
1173         {
1174             ERR(local, "(%04x,%04x): invalid handle\n",
1175                      ds, handle );
1176             return 0;
1177         }
1178         if(*((HLOCAL16 *)(ptr + blockhandle) - 1) != handle) {
1179             ERR(local, "Back ptr to handle is invalid\n");
1180             return 0;
1181         }
1182     }
1183
1184     if (flags & LMEM_MODIFY)
1185     {
1186         if (HANDLE_MOVEABLE(handle))
1187         {
1188             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1189             pEntry->flags = (flags & 0x0f00) >> 8;
1190             TRACE(local, "Changing flags to %x.\n", pEntry->flags);
1191         }
1192         return handle;
1193     }
1194
1195     if (!size)
1196     {
1197         if (flags & LMEM_MOVEABLE)
1198         {
1199             if (HANDLE_FIXED(handle))
1200             {
1201                 TRACE(local, "Freeing fixed block.\n");
1202                 return LOCAL_Free( ds, handle );
1203             }
1204             else /* Moveable block */
1205             {
1206                 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1207                 if (pEntry->lock == 0)
1208                 {
1209                     /* discards moveable blocks */
1210                     TRACE(local,"Discarding block\n");
1211                     LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
1212                     pEntry->addr = 0;
1213                     pEntry->flags = (LMEM_DISCARDED >> 8);
1214                     return handle;
1215                 }
1216             }
1217             return 0;
1218         }
1219         else if(flags == 0)
1220         {
1221             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1222             if (pEntry->lock == 0)
1223             {
1224                 /* Frees block */
1225                 return LOCAL_Free( ds, handle );
1226             }
1227         }
1228         return 0;
1229     }
1230
1231     arena = ARENA_HEADER( blockhandle );
1232     TRACE(local, "arena is %04x\n", arena );
1233     pArena = ARENA_PTR( ptr, arena );
1234
1235     if(size <= 4) size = 5;
1236     oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1237     nextarena = LALIGN(blockhandle + size);
1238
1239       /* Check for size reduction */
1240
1241     if (nextarena <= pArena->next)
1242     {
1243         TRACE(local, "size reduction, making new free block\n");
1244         LOCAL_ShrinkArena(ds, arena, nextarena - arena);
1245         TRACE(local, "returning %04x\n", handle );
1246         return handle;
1247     }
1248
1249       /* Check if the next block is free and large enough */
1250
1251     pNext = ARENA_PTR( ptr, pArena->next );
1252     if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1253         (nextarena <= pNext->next))
1254     {
1255         TRACE(local, "size increase, making new free block\n");
1256         LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
1257         TRACE(local, "returning %04x\n", handle );
1258         return handle;
1259     }
1260
1261     /* Now we have to allocate a new block, but not if (fixed block or locked
1262        block) and no LMEM_MOVEABLE */
1263
1264     if (!(flags & LMEM_MOVEABLE))
1265     {
1266         if (HANDLE_FIXED(handle))
1267         {
1268             ERR(local, "Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1269             return 0;
1270         }
1271         else
1272         {
1273             if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
1274             {
1275                 ERR(local, "Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
1276                 return 0;
1277             }
1278         }
1279     }
1280     if(HANDLE_MOVEABLE(handle)) size += sizeof(HLOCAL16);
1281     hmem = LOCAL_GetBlock( ds, size, flags );
1282     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr                             */
1283     if(HANDLE_MOVEABLE(handle))         /* LOCAL_GetBlock might have triggered    */
1284     {                                   /* a compaction, which might in turn have */
1285       blockhandle = pEntry->addr ;      /* moved the very block we are resizing   */
1286       arena = ARENA_HEADER( blockhandle );   /* thus, we reload arena, too        */
1287     }
1288     if (!hmem)
1289     {
1290         /* Remove the block from the heap and try again */
1291         LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
1292         if (!buffer) return 0;
1293         memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
1294         LOCAL_FreeArena( ds, arena );
1295         if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
1296         {
1297             if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
1298             {
1299                 ERR(local, "Can't restore saved block\n" );
1300                 HeapFree( GetProcessHeap(), 0, buffer );
1301                 return 0;
1302             }
1303             size = oldsize;
1304         }
1305         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1306         memcpy( ptr + hmem, buffer, oldsize );
1307         HeapFree( GetProcessHeap(), 0, buffer );
1308     }
1309     else
1310     {
1311         memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1312         LOCAL_FreeArena( ds, arena );
1313     }
1314     if (HANDLE_MOVEABLE( handle ))
1315     {
1316         TRACE(local, "fixing handle\n");
1317         pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1318         pEntry->addr = hmem + sizeof(HLOCAL16);
1319         /* Back ptr should still be correct */
1320         if(*(HLOCAL16 *)(ptr + hmem) != handle)
1321             ERR(local, "back ptr is invalid.\n");
1322         hmem = handle;
1323     }
1324     if (size == oldsize) hmem = 0;  /* Realloc failed */
1325     TRACE(local, "returning %04x\n", hmem );
1326     return hmem;
1327 }
1328
1329
1330 /***********************************************************************
1331  *           LOCAL_InternalLock
1332  */
1333 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1334 {
1335     HLOCAL16 old_handle = handle;
1336
1337     if (HANDLE_MOVEABLE(handle))
1338     {
1339         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1340         if (pEntry->flags == LMEM_DISCARDED) return 0;
1341         if (pEntry->lock < 0xfe) pEntry->lock++;
1342         handle = pEntry->addr;
1343     }
1344     TRACE(local, "%04x returning %04x\n",
1345                    old_handle, handle );
1346     return handle;
1347 }
1348
1349
1350 /***********************************************************************
1351  *           LOCAL_Lock
1352  */
1353 LPSTR LOCAL_Lock( HANDLE16 ds, HLOCAL16 handle )
1354 {
1355     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1356     return handle ? ptr + LOCAL_InternalLock( ptr, handle ) : NULL;
1357 }
1358
1359
1360 /***********************************************************************
1361  *           LOCAL_LockSegptr
1362  */
1363 SEGPTR LOCAL_LockSegptr( HANDLE16 ds, HLOCAL16 handle )
1364 {
1365     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1366     return PTR_SEG_OFF_TO_SEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1367 }
1368
1369
1370 /***********************************************************************
1371  *           LOCAL_Unlock
1372  */
1373 BOOL16 LOCAL_Unlock( HANDLE16 ds, HLOCAL16 handle )
1374 {
1375     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1376
1377     TRACE(local, "%04x\n", handle );
1378     if (HANDLE_MOVEABLE(handle))
1379     {
1380         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1381         if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1382         /* For moveable block, return the new lock count */
1383         /* (see _Windows_Internals_ p. 197) */
1384         return --pEntry->lock;
1385     }
1386     else return FALSE;
1387 }
1388
1389
1390 /***********************************************************************
1391  *           LOCAL_Size
1392  *
1393  * Implementation of LocalSize().
1394  */
1395 WORD LOCAL_Size( HANDLE16 ds, HLOCAL16 handle )
1396 {
1397     char *ptr = PTR_SEG_OFF_TO_LIN( CURRENT_DS, 0 );
1398     LOCALARENA *pArena;
1399
1400     TRACE(local, "%04x ds=%04x\n", handle, ds );
1401
1402     if (HANDLE_MOVEABLE( handle )) handle = *(WORD *)(ptr + handle);
1403     if (!handle) return 0;
1404     pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1405     return pArena->next - handle;
1406 }
1407
1408
1409 /***********************************************************************
1410  *           LOCAL_Flags
1411  *
1412  * Implementation of LocalFlags().
1413  */
1414 WORD LOCAL_Flags( HANDLE16 ds, HLOCAL16 handle )
1415 {
1416     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1417
1418     if (HANDLE_MOVEABLE(handle))
1419     {
1420         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1421         TRACE(local, "(%04x,%04x): returning %04x\n",
1422                        ds, handle, pEntry->lock | (pEntry->flags << 8) );
1423         return pEntry->lock | (pEntry->flags << 8);
1424     }
1425     else
1426     {
1427         TRACE(local, "(%04x,%04x): returning 0\n",
1428                        ds, handle );
1429         return 0;
1430     }
1431 }
1432
1433
1434 /***********************************************************************
1435  *           LOCAL_HeapSize
1436  *
1437  * Implementation of LocalHeapSize().
1438  */
1439 WORD LOCAL_HeapSize( HANDLE16 ds )
1440 {
1441     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1442     if (!pInfo) return 0;
1443     return pInfo->last - pInfo->first;
1444 }
1445
1446
1447 /***********************************************************************
1448  *           LOCAL_CountFree
1449  *
1450  * Implementation of LocalCountFree().
1451  */
1452 WORD LOCAL_CountFree( HANDLE16 ds )
1453 {
1454     WORD arena, total;
1455     LOCALARENA *pArena;
1456     LOCALHEAPINFO *pInfo;
1457     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1458
1459     if (!(pInfo = LOCAL_GetHeap( ds )))
1460     {
1461         ERR(local, "(%04x): Local heap not found\n", ds );
1462         LOCAL_PrintHeap( ds );
1463         return 0;
1464     }
1465
1466     total = 0;
1467     arena = pInfo->first;
1468     pArena = ARENA_PTR( ptr, arena );
1469     for (;;)
1470     {
1471         arena = pArena->free_next;
1472         pArena = ARENA_PTR( ptr, arena );
1473         if (arena == pArena->free_next) break;
1474         total += pArena->size;
1475     }
1476     TRACE(local, "(%04x): returning %d\n", ds, total);
1477     return total;
1478 }
1479
1480
1481 /***********************************************************************
1482  *           LOCAL_Handle
1483  *
1484  * Implementation of LocalHandle().
1485  */
1486 HLOCAL16 LOCAL_Handle( HANDLE16 ds, WORD addr )
1487 {
1488     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1489     LOCALHEAPINFO *pInfo;
1490     WORD table;
1491
1492     if (!(pInfo = LOCAL_GetHeap( ds )))
1493     {
1494         ERR(local, "(%04x): Local heap not found\n", ds );
1495         LOCAL_PrintHeap( ds );
1496         return 0;
1497     }
1498
1499     /* Find the address in the entry tables */
1500
1501     table = pInfo->htable;
1502     while (table)
1503     {
1504         WORD count = *(WORD *)(ptr + table);
1505         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1506         for (; count > 0; count--, pEntry++)
1507             if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1508         table = *(WORD *)pEntry;
1509     }
1510
1511     return (HLOCAL16)addr;  /* Fixed block handle is addr */
1512 }
1513
1514
1515 /***********************************************************************
1516  *           LocalAlloc16   (KERNEL.5)
1517  */
1518 HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
1519 {
1520     return LOCAL_Alloc( CURRENT_DS, flags, size );
1521 }
1522
1523
1524 /***********************************************************************
1525  *           WIN16_LocalAlloc
1526  */
1527 void WINAPI WIN16_LocalAlloc( CONTEXT *context )
1528 {
1529     WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
1530     UINT16 flags = (UINT16)stack[3];
1531     WORD size = (WORD)stack[2];
1532     TRACE(local,"WIN16LocalAlloc: %04x %d \n", flags, size);
1533     AX_reg(context) = CX_reg(context) = LOCAL_Alloc( DS_reg(context), flags, size );
1534 }
1535
1536
1537 /***********************************************************************
1538  *           LocalReAlloc16   (KERNEL.6)
1539  */
1540 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1541 {
1542     return LOCAL_ReAlloc( CURRENT_DS, handle, size, flags );
1543 }
1544
1545
1546 /***********************************************************************
1547  *           LocalFree16   (KERNEL.7)
1548  */
1549 HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
1550 {
1551     return LOCAL_Free( CURRENT_DS, handle );
1552 }
1553
1554
1555 /***********************************************************************
1556  *           LocalLock16   (KERNEL.8)
1557  *
1558  * Note: only the offset part of the pointer is returned by the relay code.
1559  */
1560 SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
1561 {
1562     return LOCAL_LockSegptr( CURRENT_DS, handle );
1563 }
1564
1565
1566 /***********************************************************************
1567  *           LocalUnlock16   (KERNEL.9)
1568  */
1569 BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
1570 {
1571     return LOCAL_Unlock( CURRENT_DS, handle );
1572 }
1573
1574
1575 /***********************************************************************
1576  *           LocalSize16   (KERNEL.10)
1577  */
1578 UINT16 WINAPI LocalSize16( HLOCAL16 handle )
1579 {
1580     return LOCAL_Size( CURRENT_DS, handle );
1581 }
1582
1583
1584 /***********************************************************************
1585  *           LocalHandle16   (KERNEL.11)
1586  */
1587 HLOCAL16 WINAPI LocalHandle16( WORD addr )
1588 {
1589     return LOCAL_Handle( CURRENT_DS, addr );
1590 }
1591
1592
1593 /***********************************************************************
1594  *           LocalFlags16   (KERNEL.12)
1595  */
1596 UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
1597 {
1598     return LOCAL_Flags( CURRENT_DS, handle );
1599 }
1600
1601
1602 /***********************************************************************
1603  *           LocalCompact16   (KERNEL.13)
1604  */
1605 UINT16 WINAPI LocalCompact16( UINT16 minfree )
1606 {
1607     TRACE(local, "%04x\n", minfree );
1608     return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1609 }
1610
1611
1612 /***********************************************************************
1613  *           LocalNotify   (KERNEL.14)
1614  *
1615  * Installs a callback function that is called for local memory events
1616  * Callback function prototype is
1617  * BOOL16 NotifyFunc(WORD wMsg, HLOCAL16 hMem, WORD wArg)
1618  * wMsg:
1619  * - LN_OUTOFMEM
1620  *   NotifyFunc seems to be responsible for allocating some memory,
1621  *   returns TRUE for success.
1622  *   wArg = number of bytes needed additionally
1623  * - LN_MOVE
1624  *   hMem = handle; wArg = old mem location
1625  * - LN_DISCARD
1626  *   NotifyFunc seems to be strongly encouraged to return TRUE,
1627  *   otherwise LogError() gets called.
1628  *   hMem = handle; wArg = flags
1629  */
1630 FARPROC16 WINAPI LocalNotify16( FARPROC16 func )
1631 {
1632     LOCALHEAPINFO *pInfo;
1633     FARPROC16 oldNotify;
1634     HANDLE16 ds = CURRENT_DS;
1635
1636     if (!(pInfo = LOCAL_GetHeap( ds )))
1637     {
1638         ERR(local, "(%04x): Local heap not found\n", ds );
1639         LOCAL_PrintHeap( ds );
1640         return 0;
1641     }
1642     TRACE(local, "(%04x): %08lx\n", ds, (DWORD)func );
1643     FIXME(local, "Half implemented\n");
1644     oldNotify = pInfo->notify;
1645     pInfo->notify = func;
1646     return oldNotify;
1647 }
1648
1649
1650 /***********************************************************************
1651  *           LocalShrink16   (KERNEL.121)
1652  */
1653 UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1654 {
1655     TRACE(local, "%04x %04x\n", handle, newsize );
1656     return 0;
1657 }
1658
1659
1660 /***********************************************************************
1661  *           GetHeapSpaces   (KERNEL.138)
1662  */
1663 DWORD WINAPI GetHeapSpaces16( HMODULE16 module )
1664 {
1665     NE_MODULE *pModule;
1666     WORD ds;
1667
1668     if (!(pModule = NE_GetPtr( module ))) return 0;
1669     ds =
1670     GlobalHandleToSel16((NE_SEG_TABLE( pModule ) + pModule->dgroup - 1)->hSeg);
1671     return MAKELONG( LOCAL_CountFree( ds ), LOCAL_HeapSize( ds ) );
1672 }
1673
1674
1675 /***********************************************************************
1676  *           LocalCountFree   (KERNEL.161)
1677  */
1678 WORD WINAPI LocalCountFree16(void)
1679 {
1680     return LOCAL_CountFree( CURRENT_DS );
1681 }
1682
1683
1684 /***********************************************************************
1685  *           LocalHeapSize   (KERNEL.162)
1686  */
1687 WORD WINAPI LocalHeapSize16(void)
1688 {
1689     TRACE(local, "(void)\n" );
1690     return LOCAL_HeapSize( CURRENT_DS );
1691 }
1692
1693
1694 /***********************************************************************
1695  *           LocalHandleDelta   (KERNEL.310)
1696  */
1697 WORD WINAPI LocalHandleDelta16( WORD delta )
1698 {
1699     LOCALHEAPINFO *pInfo;
1700
1701     if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1702     {
1703         ERR(local, "Local heap not found\n");
1704         LOCAL_PrintHeap( CURRENT_DS );
1705         return 0;
1706     }
1707     if (delta) pInfo->hdelta = delta;
1708     TRACE(local, "returning %04x\n", pInfo->hdelta);
1709     return pInfo->hdelta;
1710 }
1711
1712
1713 /***********************************************************************
1714  *           LocalInfo   (TOOLHELP.56)
1715  */
1716 BOOL16 WINAPI LocalInfo16( LOCALINFO *pLocalInfo, HGLOBAL16 handle )
1717 {
1718     LOCALHEAPINFO *pInfo = LOCAL_GetHeap(SELECTOROF(WIN16_GlobalLock16(handle)));
1719     if (!pInfo) return FALSE;
1720     pLocalInfo->wcItems = pInfo->items;
1721     return TRUE;
1722 }
1723
1724
1725 /***********************************************************************
1726  *           LocalFirst   (TOOLHELP.57)
1727  */
1728 BOOL16 WINAPI LocalFirst16( LOCALENTRY *pLocalEntry, HGLOBAL16 handle )
1729 {
1730     WORD ds = GlobalHandleToSel16( handle );
1731     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1732     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1733     if (!pInfo) return FALSE;
1734
1735     pLocalEntry->hHandle   = pInfo->first + ARENA_HEADER_SIZE;
1736     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1737     pLocalEntry->wFlags    = LF_FIXED;
1738     pLocalEntry->wcLock    = 0;
1739     pLocalEntry->wType     = LT_NORMAL;
1740     pLocalEntry->hHeap     = handle;
1741     pLocalEntry->wHeapType = NORMAL_HEAP;
1742     pLocalEntry->wNext     = ARENA_PTR(ptr,pInfo->first)->next;
1743     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1744     return TRUE;
1745 }
1746
1747
1748 /***********************************************************************
1749  *           LocalNext   (TOOLHELP.58)
1750  */
1751 BOOL16 WINAPI LocalNext16( LOCALENTRY *pLocalEntry )
1752 {
1753     WORD ds = GlobalHandleToSel16( pLocalEntry->hHeap );
1754     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1755     LOCALARENA *pArena;
1756
1757     if (!LOCAL_GetHeap( ds )) return FALSE;
1758     if (!pLocalEntry->wNext) return FALSE;
1759     pArena = ARENA_PTR( ptr, pLocalEntry->wNext );
1760
1761     pLocalEntry->hHandle   = pLocalEntry->wNext + ARENA_HEADER_SIZE;
1762     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1763     pLocalEntry->wFlags    = (pArena->prev & 3) + 1;
1764     pLocalEntry->wcLock    = 0;
1765     pLocalEntry->wType     = LT_NORMAL;
1766     if (pArena->next != pLocalEntry->wNext)  /* last one? */
1767         pLocalEntry->wNext = pArena->next;
1768     else
1769         pLocalEntry->wNext = 0;
1770     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1771     return TRUE;
1772 }
1773
1774
1775 /***********************************************************************
1776  *           LocalAlloc32   (KERNEL32.371)
1777  * RETURNS
1778  *      Handle: Success
1779  *      NULL: Failure
1780  */
1781 HLOCAL WINAPI LocalAlloc(
1782                 UINT flags, /* [in] Allocation attributes */
1783                 DWORD size    /* [in] Number of bytes to allocate */
1784 ) {
1785     return (HLOCAL)GlobalAlloc( flags, size );
1786 }
1787
1788
1789 /***********************************************************************
1790  *           LocalCompact32   (KERNEL32.372)
1791  */
1792 UINT WINAPI LocalCompact( UINT minfree )
1793 {
1794     return 0;  /* LocalCompact does nothing in Win32 */
1795 }
1796
1797
1798 /***********************************************************************
1799  *           LocalFlags32   (KERNEL32.374)
1800  * RETURNS
1801  *      Value specifying allocation flags and lock count.
1802  *      LMEM_INVALID_HANDLE: Failure
1803  */
1804 UINT WINAPI LocalFlags(
1805               HLOCAL handle /* [in] Handle of memory object */
1806 ) {
1807     return GlobalFlags( (HGLOBAL)handle );
1808 }
1809
1810
1811 /***********************************************************************
1812  *           LocalFree32   (KERNEL32.375)
1813  * RETURNS
1814  *      NULL: Success
1815  *      Handle: Failure
1816  */
1817 HLOCAL WINAPI LocalFree(
1818                 HLOCAL handle /* [in] Handle of memory object */
1819 ) {
1820     return (HLOCAL)GlobalFree( (HGLOBAL)handle );
1821 }
1822
1823
1824 /***********************************************************************
1825  *           LocalHandle32   (KERNEL32.376)
1826  * RETURNS
1827  *      Handle: Success
1828  *      NULL: Failure
1829  */
1830 HLOCAL WINAPI LocalHandle(
1831                 LPCVOID ptr /* [in] Address of local memory object */
1832 ) {
1833     return (HLOCAL)GlobalHandle( ptr );
1834 }
1835
1836
1837 /***********************************************************************
1838  *           LocalLock32   (KERNEL32.377)
1839  * Locks a local memory object and returns pointer to the first byte
1840  * of the memory block.
1841  *
1842  * RETURNS
1843  *      Pointer: Success
1844  *      NULL: Failure
1845  */
1846 LPVOID WINAPI LocalLock(
1847               HLOCAL handle /* [in] Address of local memory object */
1848 ) {
1849     return GlobalLock( (HGLOBAL)handle );
1850 }
1851
1852
1853 /***********************************************************************
1854  *           LocalReAlloc32   (KERNEL32.378)
1855  * RETURNS
1856  *      Handle: Success
1857  *      NULL: Failure
1858  */
1859 HLOCAL WINAPI LocalReAlloc(
1860                 HLOCAL handle, /* [in] Handle of memory object */
1861                 DWORD size,      /* [in] New size of block */
1862                 UINT flags     /* [in] How to reallocate object */
1863 ) {
1864     return (HLOCAL)GlobalReAlloc( (HGLOBAL)handle, size, flags );
1865 }
1866
1867
1868 /***********************************************************************
1869  *           LocalShrink32   (KERNEL32.379)
1870  */
1871 UINT WINAPI LocalShrink( HGLOBAL handle, UINT newsize )
1872 {
1873     return 0;  /* LocalShrink does nothing in Win32 */
1874 }
1875
1876
1877 /***********************************************************************
1878  *           LocalSize32   (KERNEL32.380)
1879  * RETURNS
1880  *      Size: Success
1881  *      0: Failure
1882  */
1883 UINT WINAPI LocalSize(
1884               HLOCAL handle /* [in] Handle of memory object */
1885 ) {
1886     return GlobalSize( (HGLOBAL)handle );
1887 }
1888
1889
1890 /***********************************************************************
1891  *           LocalUnlock32   (KERNEL32.381)
1892  * RETURNS
1893  *      TRUE: Object is still locked
1894  *      FALSE: Object is unlocked
1895  */
1896 BOOL WINAPI LocalUnlock(
1897               HLOCAL handle /* [in] Handle of memory object */
1898 ) {
1899     return GlobalUnlock( (HGLOBAL)handle );
1900 }