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 "debugtools.h"
  28 #include "callback.h"
  29
  30 DEFAULT_DEBUG_CHANNEL(local)
  31 DECLARE_DEBUG_CHANNEL(heap)
  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 /* LocalNotify() msgs */
  52
  53 #define LN_OUTOFMEM     0
  54 #define LN_MOVE         1
  55 #define LN_DISCARD      2
  56
  57 /* Layout of a handle entry table
  58  *
  59  * WORD                     count of entries
  60  * LOCALHANDLEENTRY[count]  entries
  61  * WORD                     near ptr to next table
  62  */
  63 typedef struct
  64 {
  65     WORD addr;                /* Address of the MOVEABLE block */
  66     BYTE flags;               /* Flags for this block */
  67     BYTE lock;                /* Lock count */
  68 } LOCALHANDLEENTRY;
  69
  70 /*
  71  * We make addr = 4n + 2 and set *((WORD *)addr - 1) = &addr like Windows does
  72  * in case something actually relies on this.
  73  * Note the ARENA_HEADER(addr) still produces the desired result ie. 4n - 4
  74  *
  75  * An unused handle has lock = flags = 0xff. In windows addr is that of next
  76  * free handle, at the moment in wine we set it to 0.
  77  *
  78  * A discarded block's handle has lock = addr = 0 and flags = 0x40
  79  * (LMEM_DISCARDED >> 8)
  80  */
  81
  82 #include "pshpack1.h"
  83
  84 typedef struct
  85 {
  86     WORD check;                 /* 00 Heap checking flag */
  87     WORD freeze;                /* 02 Heap frozen flag */
  88     WORD items;                 /* 04 Count of items on the heap */
  89     WORD first;                 /* 06 First item of the heap */
  90     WORD pad1;                  /* 08 Always 0 */
  91     WORD last;                  /* 0a Last item of the heap */
  92     WORD pad2;                  /* 0c Always 0 */
  93     BYTE ncompact;              /* 0e Compactions counter */
  94     BYTE dislevel;              /* 0f Discard level */
  95     DWORD distotal;             /* 10 Total bytes discarded */
  96     WORD htable;                /* 14 Pointer to handle table */
  97     WORD hfree;                 /* 16 Pointer to free handle table */
  98     WORD hdelta;                /* 18 Delta to expand the handle table */
  99     WORD expand;                /* 1a Pointer to expand function (unused) */
 100     WORD pstat;                 /* 1c Pointer to status structure (unused) */
 101     FARPROC16 notify WINE_PACKED; /* 1e Pointer to LocalNotify() function */
 102     WORD lock;                  /* 22 Lock count for the heap */
 103     WORD extra;                 /* 24 Extra bytes to allocate when expanding */
 104     WORD minsize;               /* 26 Minimum size of the heap */
 105     WORD magic;                 /* 28 Magic number */
 106 } LOCALHEAPINFO;
 107
 108 #include "poppack.h"
 109
 110 #define LOCAL_HEAP_MAGIC  0x484c  /* 'LH' */
 111
 112 WORD USER_HeapSel = 0;  /* USER heap selector */
 113 WORD GDI_HeapSel = 0;   /* GDI heap selector */
 114
 115   /* All local heap allocations are aligned on 4-byte boundaries */
 116 #define LALIGN(word)          (((word) + 3) & ~3)
 117
 118 #define ARENA_PTR(ptr,arena)       ((LOCALARENA *)((char*)(ptr)+(arena)))
 119 #define ARENA_PREV(ptr,arena)      (ARENA_PTR((ptr),(arena))->prev & ~3)
 120 #define ARENA_NEXT(ptr,arena)      (ARENA_PTR((ptr),(arena))->next)
 121 #define ARENA_FLAGS(ptr,arena)     (ARENA_PTR((ptr),(arena))->prev & 3)
 122
 123   /* determine whether the handle belongs to a fixed or a moveable block */
 124 #define HANDLE_FIXED(handle) (((handle) & 3) == 0)
 125 #define HANDLE_MOVEABLE(handle) (((handle) & 3) == 2)
 126
 127 /***********************************************************************
 128  *           LOCAL_GetHeap
 129  *
 130  * Return a pointer to the local heap, making sure it exists.
 131  */
 132 static LOCALHEAPINFO *LOCAL_GetHeap( HANDLE16 ds )
 133 {
 134     LOCALHEAPINFO *pInfo;
 135     INSTANCEDATA *ptr = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( ds, 0 );
 136     TRACE("Heap at %p, %04x\n", ptr, (ptr != NULL ? ptr->heap : 0xFFFF));
 137     if (!ptr || !ptr->heap) return NULL;
 138     if (IsBadReadPtr16( (SEGPTR)MAKELONG(ptr->heap,ds), sizeof(LOCALHEAPINFO)))
 139     {
 140         WARN("Bad pointer\n");
 141         return NULL;
 142     }
 143     pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
 144     if (pInfo->magic != LOCAL_HEAP_MAGIC)
 145     {
 146         WARN("Bad magic\n");
 147         return NULL;
 148     }
 149     return pInfo;
 150 }
 151
 152
 153 /***********************************************************************
 154  *           LOCAL_MakeBlockFree
 155  *
 156  * Make a block free, inserting it in the free-list.
 157  * 'block' is the handle of the block arena; 'baseptr' points to
 158  * the beginning of the data segment containing the heap.
 159  */
 160 static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
 161 {
 162     LOCALARENA *pArena, *pNext;
 163     WORD next;
 164
 165       /* Mark the block as free */
 166
 167     pArena = ARENA_PTR( baseptr, block );
 168     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
 169     pArena->size = pArena->next - block;
 170
 171       /* Find the next free block (last block is always free) */
 172
 173     next = pArena->next;
 174     for (;;)
 175     {
 176         pNext = ARENA_PTR( baseptr, next );
 177         if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
 178         next = pNext->next;
 179     }
 180
 181     TRACE("%04x, next %04x\n", block, next );
 182       /* Insert the free block in the free-list */
 183
 184     pArena->free_prev = pNext->free_prev;
 185     pArena->free_next = next;
 186     ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
 187     pNext->free_prev  = block;
 188 }
 189
 190
 191 /***********************************************************************
 192  *           LOCAL_RemoveFreeBlock
 193  *
 194  * Remove a block from the free-list.
 195  * 'block' is the handle of the block arena; 'baseptr' points to
 196  * the beginning of the data segment containing the heap.
 197  */
 198 static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
 199 {
 200       /* Mark the block as fixed */
 201
 202     LOCALARENA *pArena = ARENA_PTR( baseptr, block );
 203     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
 204
 205       /* Remove it from the list */
 206
 207     ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
 208     ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
 209 }
 210
 211
 212 /***********************************************************************
 213  *           LOCAL_AddBlock
 214  *
 215  * Insert a new block in the heap.
 216  * 'new' is the handle of the new block arena; 'baseptr' points to
 217  * the beginning of the data segment containing the heap; 'prev' is
 218  * the block before the new one.
 219  */
 220 static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
 221 {
 222     LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
 223     LOCALARENA *pNew  = ARENA_PTR( baseptr, new );
 224
 225     pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
 226     pNew->next = pPrev->next;
 227     ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
 228     ARENA_PTR(baseptr,pPrev->next)->prev |= new;
 229     pPrev->next = new;
 230 }
 231
 232
 233 /***********************************************************************
 234  *           LOCAL_RemoveBlock
 235  *
 236  * Remove a block from the heap.
 237  * 'block' is the handle of the block arena; 'baseptr' points to
 238  * the beginning of the data segment containing the heap.
 239  */
 240 static void LOCAL_RemoveBlock( char *baseptr, WORD block )
 241 {
 242     LOCALARENA *pArena, *pTmp;
 243
 244       /* Remove the block from the free-list */
 245
 246     TRACE("\n");
 247     pArena = ARENA_PTR( baseptr, block );
 248     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 249         LOCAL_RemoveFreeBlock( baseptr, block );
 250
 251       /* If the previous block is free, expand its size */
 252
 253     pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
 254     if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
 255         pTmp->size += pArena->next - block;
 256
 257       /* Remove the block from the linked list */
 258
 259     pTmp->next = pArena->next;
 260     pTmp = ARENA_PTR( baseptr, pArena->next );
 261     pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
 262 }
 263
 264
 265 /***********************************************************************
 266  *           LOCAL_PrintHeap
 267  */
 268 static void LOCAL_PrintHeap( HANDLE16 ds )
 269 {
 270     char *ptr;
 271     LOCALHEAPINFO *pInfo;
 272     WORD arena;
 273
 274     /* FIXME - the test should be done when calling the function!
 275                plus is not clear that we should print this info
 276                only when TRACE_ON is on! */
 277     if(!TRACE_ON(local)) return;
 278
 279     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 280     pInfo = LOCAL_GetHeap( ds );
 281
 282     if (!pInfo)
 283     {
 284         DPRINTF( "Local Heap corrupted!  ds=%04x\n", ds );
 285         return;
 286     }
 287     DPRINTF( "Local Heap  ds=%04x first=%04x last=%04x items=%d\n",
 288              ds, pInfo->first, pInfo->last, pInfo->items );
 289
 290     arena = pInfo->first;
 291     for (;;)
 292     {
 293         LOCALARENA *pArena = ARENA_PTR(ptr,arena);
 294         DPRINTF( "  %04x: prev=%04x next=%04x type=%d\n", arena,
 295               pArena->prev & ~3, pArena->next, pArena->prev & 3 );
 296         if (arena == pInfo->first)
 297         {
 298             DPRINTF( "        size=%d free_prev=%04x free_next=%04x\n",
 299                      pArena->size, pArena->free_prev, pArena->free_next );
 300         }
 301         if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 302         {
 303             DPRINTF( "        size=%d free_prev=%04x free_next=%04x\n",
 304                      pArena->size, pArena->free_prev, pArena->free_next );
 305             if (pArena->next == arena) break;  /* last one */
 306             if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
 307             {
 308                 DPRINTF( "*** arena->free_next->free_prev != arena\n" );
 309                 break;
 310             }
 311         }
 312         if (pArena->next == arena)
 313         {
 314             DPRINTF( "*** last block is not marked free\n" );
 315             break;
 316         }
 317         if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
 318         {
 319             DPRINTF( "*** arena->next->prev != arena (%04x, %04x)\n",
 320                      pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
 321             break;
 322         }
 323         arena = pArena->next;
 324     }
 325 }
 326
 327
 328 /***********************************************************************
 329  *           LocalInit   (KERNEL.4)
 330  */
 331 BOOL16 WINAPI LocalInit16( HANDLE16 selector, WORD start, WORD end )
 332 {
 333     char *ptr;
 334     WORD heapInfoArena, freeArena, lastArena;
 335     LOCALHEAPINFO *pHeapInfo;
 336     LOCALARENA *pArena, *pFirstArena, *pLastArena;
 337     NE_MODULE *pModule;
 338     BOOL16 ret = FALSE;
 339
 340       /* The initial layout of the heap is: */
 341       /* - first arena         (FIXED)      */
 342       /* - heap info structure (FIXED)      */
 343       /* - large free block    (FREE)       */
 344       /* - last arena          (FREE)       */
 345
 346     TRACE("%04x %04x-%04x\n", selector, start, end);
 347     if (!selector) selector = CURRENT_DS;
 348
 349     if (TRACE_ON(heap))
 350     {
 351         /* If TRACE_ON(heap) is set, the global heap blocks are */
 352         /* cleared before use, so we can test for double initialization. */
 353         if (LOCAL_GetHeap(selector))
 354         {
 355             ERR("Heap %04x initialized twice.\n", selector);
 356             LOCAL_PrintHeap(selector);
 357         }
 358     }
 359
 360     if (start == 0)
 361     {
 362         /* start == 0 means: put the local heap at the end of the segment */
 363
 364         DWORD size = GlobalSize16( GlobalHandle16( selector ) );
 365         start = (WORD)(size > 0xffff ? 0xffff : size) - 1;
 366         if ( end > 0xfffe ) end = 0xfffe;
 367         start -= end;
 368         end += start;
 369
 370         /* Paranoid check */
 371
 372         if ((pModule = NE_GetPtr( GlobalHandle16( selector ) )))
 373         {
 374             SEGTABLEENTRY *pSeg = NE_SEG_TABLE( pModule );
 375             int segNr;
 376
 377             for ( segNr = 0; segNr < pModule->seg_count; segNr++, pSeg++ )
 378                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 379                     break;
 380
 381             if ( segNr < pModule->seg_count )
 382             {
 383                 WORD minsize = pSeg->minsize;
 384                 if ( pModule->ss == segNr+1 )
 385                     minsize += pModule->stack_size;
 386
 387                 TRACE(" new start %04x, minstart: %04x\n", start, minsize);
 388             }
 389         }
 390     }
 391     ptr = PTR_SEG_OFF_TO_LIN( selector, 0 );
 392
 393     start = LALIGN( max( start, sizeof(INSTANCEDATA) ) );
 394     heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
 395     freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
 396                         + sizeof(LOCALHEAPINFO) );
 397     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 398
 399       /* Make sure there's enough space.       */
 400
 401     if (freeArena + sizeof(LOCALARENA) >= lastArena) goto done;
 402
 403       /* Initialise the first arena */
 404
 405     pFirstArena = ARENA_PTR( ptr, start );
 406     pFirstArena->prev      = start | LOCAL_ARENA_FIXED;
 407     pFirstArena->next      = heapInfoArena;
 408     pFirstArena->size      = LALIGN(sizeof(LOCALARENA));
 409     pFirstArena->free_prev = start;  /* this one */
 410     pFirstArena->free_next = freeArena;
 411
 412       /* Initialise the arena of the heap info structure */
 413
 414     pArena = ARENA_PTR( ptr, heapInfoArena );
 415     pArena->prev = start | LOCAL_ARENA_FIXED;
 416     pArena->next = freeArena;
 417
 418       /* Initialise the heap info structure */
 419
 420     pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
 421     memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
 422     pHeapInfo->items   = 4;
 423     pHeapInfo->first   = start;
 424     pHeapInfo->last    = lastArena;
 425     pHeapInfo->htable  = 0;
 426     pHeapInfo->hdelta  = 0x20;
 427     pHeapInfo->extra   = 0x200;
 428     pHeapInfo->minsize = lastArena - freeArena;
 429     pHeapInfo->magic   = LOCAL_HEAP_MAGIC;
 430
 431       /* Initialise the large free block */
 432
 433     pArena = ARENA_PTR( ptr, freeArena );
 434     pArena->prev      = heapInfoArena | LOCAL_ARENA_FREE;
 435     pArena->next      = lastArena;
 436     pArena->size      = lastArena - freeArena;
 437     pArena->free_prev = start;
 438     pArena->free_next = lastArena;
 439
 440       /* Initialise the last block */
 441
 442     pLastArena = ARENA_PTR( ptr, lastArena );
 443     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 444     pLastArena->next      = lastArena;  /* this one */
 445     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 446     pLastArena->free_prev = freeArena;
 447     pLastArena->free_next = lastArena;  /* this one */
 448
 449       /* Store the local heap address in the instance data */
 450
 451     ((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
 452     LOCAL_PrintHeap( selector );
 453     ret = TRUE;
 454
 455  done:
 456     CURRENT_STACK16->ecx = ret;  /* must be returned in cx too */
 457     return ret;
 458 }
 459
 460 /***********************************************************************
 461  *           LOCAL_GrowHeap
 462  */
 463 static BOOL16 LOCAL_GrowHeap( HANDLE16 ds )
 464 {
 465     HANDLE16 hseg;
 466     LONG oldsize;
 467     LONG end;
 468     LOCALHEAPINFO *pHeapInfo;
 469     WORD freeArena, lastArena;
 470     LOCALARENA *pArena, *pLastArena;
 471     char *ptr;
 472
 473     hseg = GlobalHandle16( ds );
 474     /* maybe mem allocated by Virtual*() ? */
 475     if (!hseg) return FALSE;
 476
 477     oldsize = GlobalSize16( hseg );
 478     /* if nothing can be gained, return */
 479     if (oldsize > 0xfff0) return FALSE;
 480     hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
 481     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 482     pHeapInfo = LOCAL_GetHeap( ds );
 483     if (pHeapInfo == NULL) {
 484         ERR("Heap not found\n" );
 485         return FALSE;
 486     }
 487     end = GlobalSize16( hseg );
 488     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 489
 490       /* Update the HeapInfo */
 491     pHeapInfo->items++;
 492     freeArena = pHeapInfo->last;
 493     pHeapInfo->last = lastArena;
 494     pHeapInfo->minsize += end - oldsize;
 495
 496       /* grow the old last block */
 497     pArena = ARENA_PTR( ptr, freeArena );
 498     pArena->size      = lastArena - freeArena;
 499     pArena->next      = lastArena;
 500     pArena->free_next = lastArena;
 501
 502       /* Initialise the new last block */
 503
 504     pLastArena = ARENA_PTR( ptr, lastArena );
 505     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 506     pLastArena->next      = lastArena;  /* this one */
 507     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 508     pLastArena->free_prev = freeArena;
 509     pLastArena->free_next = lastArena;  /* this one */
 510
 511     /* If block before freeArena is also free then merge them */
 512     if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
 513     {
 514         LOCAL_RemoveBlock(ptr, freeArena);
 515         pHeapInfo->items--;
 516     }
 517
 518     TRACE("Heap expanded\n" );
 519     LOCAL_PrintHeap( ds );
 520     return TRUE;
 521 }
 522
 523
 524 /***********************************************************************
 525  *           LOCAL_FreeArena
 526  */
 527 static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
 528 {
 529     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 530     LOCALHEAPINFO *pInfo;
 531     LOCALARENA *pArena, *pPrev, *pNext;
 532
 533     TRACE("%04x ds=%04x\n", arena, ds );
 534     if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
 535
 536     pArena = ARENA_PTR( ptr, arena );
 537     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 538     {
 539         /* shouldn't happen */
 540         ERR("Trying to free block %04x twice!\n",
 541                  arena );
 542         LOCAL_PrintHeap( ds );
 543         return arena;
 544     }
 545
 546       /* Check if we can merge with the previous block */
 547
 548     pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
 549     pNext = ARENA_PTR( ptr, pArena->next );
 550     if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
 551     {
 552         arena  = pArena->prev & ~3;
 553         pArena = pPrev;
 554         LOCAL_RemoveBlock( ptr, pPrev->next );
 555         pInfo->items--;
 556     }
 557     else  /* Make a new free block */
 558     {
 559         LOCAL_MakeBlockFree( ptr, arena );
 560     }
 561
 562       /* Check if we can merge with the next block */
 563
 564     if ((pArena->next == pArena->free_next) &&
 565         (pArena->next != pInfo->last))
 566     {
 567         LOCAL_RemoveBlock( ptr, pArena->next );
 568         pInfo->items--;
 569     }
 570     return 0;
 571 }
 572
 573
 574 /***********************************************************************
 575  *           LOCAL_ShrinkArena
 576  *
 577  * Shrink an arena by creating a free block at its end if possible.
 578  * 'size' includes the arena header, and must be aligned.
 579  */
 580 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
 581 {
 582     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 583     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 584
 585     if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
 586     {
 587         LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
 588         if (!pInfo) return;
 589         LOCAL_AddBlock( ptr, arena, arena + size );
 590         pInfo->items++;
 591         LOCAL_FreeArena( ds, arena + size );
 592     }
 593 }
 594
 595
 596 /***********************************************************************
 597  *           LOCAL_GrowArenaDownward
 598  *
 599  * Grow an arena downward by using the previous arena (must be free).
 600  */
 601 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
 602 {
 603     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 604     LOCALHEAPINFO *pInfo;
 605     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 606     WORD prevArena = pArena->prev & ~3;
 607     LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
 608     WORD offset, size;
 609     char *p;
 610
 611     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 612     offset = pPrevArena->size;
 613     size = pArena->next - arena - ARENA_HEADER_SIZE;
 614     LOCAL_RemoveFreeBlock( ptr, prevArena );
 615     LOCAL_RemoveBlock( ptr, arena );
 616     pInfo->items--;
 617     p = (char *)pPrevArena + ARENA_HEADER_SIZE;
 618     while (offset < size)
 619     {
 620         memcpy( p, p + offset, offset );
 621         p += offset;
 622         size -= offset;
 623     }
 624     if (size) memcpy( p, p + offset, size );
 625     LOCAL_ShrinkArena( ds, prevArena, newsize );
 626 }
 627
 628
 629
 630 /***********************************************************************
 631  *           LOCAL_GrowArenaUpward
 632  *
 633  * Grow an arena upward by using the next arena (must be free and big
 634  * enough). Newsize includes the arena header and must be aligned.
 635  */
 636 static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
 637 {
 638     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 639     LOCALHEAPINFO *pInfo;
 640     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 641     WORD nextArena = pArena->next;
 642
 643     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 644     LOCAL_RemoveBlock( ptr, nextArena );
 645     pInfo->items--;
 646     LOCAL_ShrinkArena( ds, arena, newsize );
 647 }
 648
 649
 650 /***********************************************************************
 651  *           LOCAL_GetFreeSpace
 652  */
 653 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
 654 {
 655     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 656     LOCALHEAPINFO *pInfo;
 657     LOCALARENA *pArena;
 658     WORD arena;
 659     WORD freespace = 0;
 660
 661     if (!(pInfo = LOCAL_GetHeap( ds )))
 662     {
 663         ERR("Local heap not found\n" );
 664         LOCAL_PrintHeap(ds);
 665         return 0;
 666     }
 667     arena = pInfo->first;
 668     pArena = ARENA_PTR( ptr, arena );
 669     while (arena != pArena->free_next)
 670     {
 671         arena = pArena->free_next;
 672         pArena = ARENA_PTR( ptr, arena );
 673         if (pArena->size >= freespace) freespace = pArena->size;
 674     }
 675     /* FIXME doesn't yet calculate space that would become free if everything
 676        were discarded when countdiscard == 1 */
 677     if (freespace < ARENA_HEADER_SIZE) freespace = 0;
 678     else freespace -= ARENA_HEADER_SIZE;
 679     return freespace;
 680 }
 681
 682
 683 /***********************************************************************
 684  *           LOCAL_Compact
 685  */
 686 WORD LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
 687 {
 688     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 689     LOCALHEAPINFO *pInfo;
 690     LOCALARENA *pArena, *pMoveArena, *pFinalArena;
 691     WORD arena, movearena, finalarena, table;
 692     WORD count, movesize, size;
 693     WORD freespace;
 694     LOCALHANDLEENTRY *pEntry;
 695
 696     if (!(pInfo = LOCAL_GetHeap( ds )))
 697     {
 698         ERR("Local heap not found\n" );
 699         LOCAL_PrintHeap(ds);
 700         return 0;
 701     }
 702     TRACE("ds = %04x, minfree = %04x, flags = %04x\n",
 703                  ds, minfree, flags);
 704     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 705     if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
 706     {
 707         TRACE("Returning %04x.\n", freespace);
 708         return freespace;
 709     }
 710     TRACE("Compacting heap %04x.\n", ds);
 711     table = pInfo->htable;
 712     while(table)
 713     {
 714         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 715         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 716         {
 717             if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
 718             {
 719                 /* OK we can move this one if we want */
 720                 TRACE("handle %04x (block %04x) can be moved.\n",
 721                              (WORD)((char *)pEntry - ptr), pEntry->addr);
 722                 movearena = ARENA_HEADER(pEntry->addr);
 723                 pMoveArena = ARENA_PTR(ptr, movearena);
 724                 movesize = pMoveArena->next - movearena;
 725                 arena = pInfo->first;
 726                 pArena = ARENA_PTR(ptr, arena);
 727                 size = 0xffff;
 728                 finalarena = 0;
 729                 /* Try to find the smallest arena that will do, */
 730                 /* which is below us in memory */
 731                 for(;;)
 732                 {
 733                     arena = pArena->free_next;
 734                     pArena = ARENA_PTR(ptr, arena);
 735                     if(arena >= movearena)
 736                         break;
 737                     if(arena == pArena->free_next)
 738                         break;
 739                     if((pArena->size >= movesize) && (pArena->size < size))
 740                     {
 741                         size = pArena->size;
 742                         finalarena = arena;
 743                     }
 744                 }
 745                 if (finalarena) /* Actually got somewhere to move */
 746                 {
 747                     TRACE("Moving it to %04x.\n", finalarena);
 748                     pFinalArena = ARENA_PTR(ptr, finalarena);
 749                     size = pFinalArena->size;
 750                     LOCAL_RemoveFreeBlock(ptr, finalarena);
 751                     LOCAL_ShrinkArena( ds, finalarena, movesize );
 752                     /* Copy the arena to it's new location */
 753                     memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
 754                            (char *)pMoveArena + ARENA_HEADER_SIZE,
 755                            movesize - ARENA_HEADER_SIZE );
 756                     /* Free the old location */
 757                     LOCAL_FreeArena(ds, movearena);
 758                     if (pInfo->notify)
 759                         Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_MOVE,
 760                         (WORD)((char *)pEntry - ptr), pEntry->addr);
 761                     /* Update handle table entry */
 762                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 763                 }
 764                 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
 765                                == LOCAL_ARENA_FREE)
 766                 {
 767                     /* Previous arena is free (but < movesize)  */
 768                     /* so we can 'slide' movearena down into it */
 769                     finalarena = pMoveArena->prev & ~3;
 770                     LOCAL_GrowArenaDownward( ds, movearena, movesize );
 771                     /* Update handle table entry */
 772                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 773                 }
 774             }
 775         }
 776         table = *(WORD *)pEntry;
 777     }
 778     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 779     if(freespace >= minfree || (flags & LMEM_NODISCARD))
 780     {
 781         TRACE("Returning %04x.\n", freespace);
 782         return freespace;
 783     }
 784
 785     table = pInfo->htable;
 786     while(table)
 787     {
 788         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 789         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 790         {
 791             if(pEntry->addr && pEntry->lock == 0 &&
 792              (pEntry->flags & (LMEM_DISCARDABLE >> 8)))
 793             {
 794                 TRACE("Discarding handle %04x (block %04x).\n",
 795                               (char *)pEntry - ptr, pEntry->addr);
 796                 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
 797                 if (pInfo->notify)
 798                     Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_DISCARD,
 799                         (char *)pEntry - ptr, pEntry->flags);
 800                 pEntry->addr = 0;
 801                 pEntry->flags = (LMEM_DISCARDED >> 8);
 802             }
 803         }
 804         table = *(WORD *)pEntry;
 805     }
 806     return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
 807 }
 808
 809
 810 /***********************************************************************
 811  *           LOCAL_FindFreeBlock
 812  */
 813 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
 814 {
 815     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 816     LOCALHEAPINFO *pInfo;
 817     LOCALARENA *pArena;
 818     WORD arena;
 819
 820     if (!(pInfo = LOCAL_GetHeap( ds )))
 821     {
 822         ERR("Local heap not found\n" );
 823         LOCAL_PrintHeap(ds);
 824         return 0;
 825     }
 826
 827     arena = pInfo->first;
 828     pArena = ARENA_PTR( ptr, arena );
 829     for (;;) {
 830         arena = pArena->free_next;
 831         pArena = ARENA_PTR( ptr, arena );
 832         if (arena == pArena->free_next) break;
 833         if (pArena->size >= size) return arena;
 834     }
 835     TRACE("not enough space\n" );
 836     LOCAL_PrintHeap(ds);
 837     return 0;
 838 }
 839
 840 /***********************************************************************
 841  *           LOCAL_GetBlock
 842  * The segment may get moved around in this function, so all callers
 843  * should reset their pointer variables.
 844  */
 845 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
 846 {
 847     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 848     LOCALHEAPINFO *pInfo;
 849     LOCALARENA *pArena;
 850     WORD arena;
 851
 852     if (!(pInfo = LOCAL_GetHeap( ds )))
 853     {
 854         ERR("Local heap not found\n");
 855         LOCAL_PrintHeap(ds);
 856         return 0;
 857     }
 858
 859     size += ARENA_HEADER_SIZE;
 860     size = LALIGN( max( size, sizeof(LOCALARENA) ) );
 861
 862 #if 0
 863 notify_done:
 864 #endif
 865       /* Find a suitable free block */
 866     arena = LOCAL_FindFreeBlock( ds, size );
 867     if (arena == 0) {
 868         /* no space: try to make some */
 869         LOCAL_Compact( ds, size, flags );
 870         arena = LOCAL_FindFreeBlock( ds, size );
 871     }
 872     if (arena == 0) {
 873         /* still no space: try to grow the segment */
 874         if (!(LOCAL_GrowHeap( ds )))
 875         {
 876 #if 0
 877             /* FIXME: doesn't work correctly yet */
 878             if ((pInfo->notify) && (Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_OUTOFMEM, ds - 20, size))) /* FIXME: "size" correct ? (should indicate bytes needed) */
 879                 goto notify_done;
 880 #endif
 881             return 0;
 882         }
 883         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 884         pInfo = LOCAL_GetHeap( ds );
 885         arena = LOCAL_FindFreeBlock( ds, size );
 886     }
 887     if (arena == 0) {
 888         if (ds == GDI_HeapSel) {
 889             ERR("not enough space in GDI local heap "
 890                          "(%04x) for %d bytes\n", ds, size );
 891         } else if (ds == USER_HeapSel) {
 892             ERR("not enough space in USER local heap "
 893                          "(%04x) for %d bytes\n", ds, size );
 894         } else {
 895             ERR("not enough space in local heap "
 896                          "%04x for %d bytes\n", ds, size );
 897         }
 898 #if 0
 899         if ((pInfo->notify) &&
 900         /* FIXME: "size" correct ? (should indicate bytes needed) */
 901         (Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_OUTOFMEM, ds, size)))
 902             goto notify_done;
 903 #endif
 904         return 0;
 905     }
 906
 907       /* Make a block out of the free arena */
 908     pArena = ARENA_PTR( ptr, arena );
 909     TRACE("size = %04x, arena %04x size %04x\n",
 910                   size, arena, pArena->size );
 911     LOCAL_RemoveFreeBlock( ptr, arena );
 912     LOCAL_ShrinkArena( ds, arena, size );
 913
 914     if (flags & LMEM_ZEROINIT)
 915         memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
 916     return arena + ARENA_HEADER_SIZE;
 917 }
 918
 919
 920 /***********************************************************************
 921  *           LOCAL_NewHTable
 922  */
 923 static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
 924 {
 925     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 926     LOCALHEAPINFO *pInfo;
 927     LOCALHANDLEENTRY *pEntry;
 928     HLOCAL16 handle;
 929     int i;
 930
 931     TRACE("\n" );
 932     if (!(pInfo = LOCAL_GetHeap( ds )))
 933     {
 934         ERR("Local heap not found\n");
 935         LOCAL_PrintHeap(ds);
 936         return FALSE;
 937     }
 938
 939     if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
 940                                    + 2 * sizeof(WORD), LMEM_FIXED )))
 941         return FALSE;
 942     if (!(ptr = PTR_SEG_OFF_TO_LIN( ds, 0 )))
 943         ERR("ptr == NULL after GetBlock.\n");
 944     if (!(pInfo = LOCAL_GetHeap( ds )))
 945         ERR("pInfo == NULL after GetBlock.\n");
 946
 947     /* Fill the entry table */
 948
 949     *(WORD *)(ptr + handle) = pInfo->hdelta;
 950     pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
 951     for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
 952         pEntry->lock = pEntry->flags = 0xff;
 953         pEntry->addr = 0;
 954     }
 955     *(WORD *)pEntry = pInfo->htable;
 956     pInfo->htable = handle;
 957     return TRUE;
 958 }
 959
 960
 961 /***********************************************************************
 962  *           LOCAL_GetNewHandleEntry
 963  */
 964 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
 965 {
 966     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 967     LOCALHEAPINFO *pInfo;
 968     LOCALHANDLEENTRY *pEntry = NULL;
 969     WORD table;
 970
 971     if (!(pInfo = LOCAL_GetHeap( ds )))
 972     {
 973         ERR("Local heap not found\n");
 974         LOCAL_PrintHeap(ds);
 975         return 0;
 976     }
 977
 978     /* Find a free slot in existing tables */
 979
 980     table = pInfo->htable;
 981     while (table)
 982     {
 983         WORD count = *(WORD *)(ptr + table);
 984         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 985         for (; count > 0; count--, pEntry++)
 986             if (pEntry->lock == 0xff) break;
 987         if (count) break;
 988         table = *(WORD *)pEntry;
 989     }
 990
 991     if (!table)  /* We need to create a new table */
 992     {
 993         if (!LOCAL_NewHTable( ds )) return 0;
 994         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 995         pInfo = LOCAL_GetHeap( ds );
 996         pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
 997     }
 998
 999     /* Now allocate this entry */
1000
1001     pEntry->lock = 0;
1002     pEntry->flags = 0;
1003     TRACE("(%04x): %04x\n",
1004                    ds, ((char *)pEntry - ptr) );
1005     return (HLOCAL16)((char *)pEntry - ptr);
1006 }
1007
1008
1009 /***********************************************************************
1010  *           LOCAL_FreeHandleEntry
1011  *
1012  * Free a handle table entry.
1013  */
1014 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
1015 {
1016     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1017     LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1018     LOCALHEAPINFO *pInfo;
1019     WORD *pTable;
1020     WORD table, count, i;
1021
1022     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
1023
1024     /* Find the table where this handle comes from */
1025
1026     pTable = &pInfo->htable;
1027     while (*pTable)
1028     {
1029         WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
1030         if ((handle >= *pTable + sizeof(WORD)) &&
1031             (handle < *pTable + sizeof(WORD) + size)) break;  /* Found it */
1032         pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
1033     }
1034     if (!*pTable)
1035     {
1036         ERR("Invalid entry %04x\n", handle);
1037         LOCAL_PrintHeap( ds );
1038         return;
1039     }
1040
1041     /* Make the entry free */
1042
1043     pEntry->addr = 0;  /* just in case */
1044     pEntry->lock = 0xff;
1045     pEntry->flags = 0xff;
1046     /* Now check if all entries in this table are free */
1047
1048     table = *pTable;
1049     pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1050     count = *(WORD *)(ptr + table);
1051     for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
1052
1053     /* Remove the table from the linked list and free it */
1054
1055     TRACE("(%04x): freeing table %04x\n",
1056                    ds, table);
1057     *pTable = *(WORD *)pEntry;
1058     LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
1059 }
1060
1061
1062 /***********************************************************************
1063  *           LOCAL_Free
1064  *
1065  * Implementation of LocalFree().
1066  */
1067 HLOCAL16 LOCAL_Free( HANDLE16 ds, HLOCAL16 handle )
1068 {
1069     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1070
1071     TRACE("%04x ds=%04x\n", handle, ds );
1072
1073     if (!handle) { WARN("Handle is 0.\n" ); return 0; }
1074     if (HANDLE_FIXED( handle ))
1075     {
1076         if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0;  /* OK */
1077         else return handle;  /* couldn't free it */
1078     }
1079     else
1080     {
1081         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1082         if (pEntry->flags != (LMEM_DISCARDED >> 8))
1083         {
1084             TRACE("real block at %04x\n",
1085                            pEntry->addr );
1086             if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr) ))
1087                 return handle; /* couldn't free it */
1088         }
1089         LOCAL_FreeHandleEntry( ds, handle );
1090         return 0;  /* OK */
1091     }
1092 }
1093
1094
1095 /***********************************************************************
1096  *           LOCAL_Alloc
1097  *
1098  * Implementation of LocalAlloc().
1099  *
1100  */
1101 HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD flags, WORD size )
1102 {
1103     char *ptr;
1104     HLOCAL16 handle;
1105
1106     TRACE("%04x %d ds=%04x\n", flags, size, ds );
1107
1108     if(size > 0 && size <= 4) size = 5;
1109     if (flags & LMEM_MOVEABLE)
1110     {
1111         LOCALHANDLEENTRY *plhe;
1112         HLOCAL16 hmem;
1113
1114         if(size)
1115         {
1116             if (!(hmem = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags )))
1117                 return 0;
1118         }
1119         else /* We just need to allocate a discarded handle */
1120             hmem = 0;
1121         if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1122         {
1123             WARN("Couldn't get handle.\n");
1124             if(hmem)
1125                 LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1126             return 0;
1127         }
1128         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1129         plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1130         plhe->lock = 0;
1131         if(hmem)
1132         {
1133             plhe->addr = hmem + sizeof(HLOCAL16);
1134             plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
1135             *(HLOCAL16 *)(ptr + hmem) = handle;
1136         }
1137         else
1138         {
1139             plhe->addr = 0;
1140             plhe->flags = LMEM_DISCARDED >> 8;
1141         }
1142     }
1143     else /* FIXED */
1144     {
1145         if(!size)
1146             return 0;
1147         handle = LOCAL_GetBlock( ds, size, flags );
1148     }
1149     return handle;
1150 }
1151
1152
1153 /***********************************************************************
1154  *           LOCAL_ReAlloc
1155  *
1156  * Implementation of LocalReAlloc().
1157  */
1158 HLOCAL16 LOCAL_ReAlloc( HANDLE16 ds, HLOCAL16 handle, WORD size, WORD flags )
1159 {
1160     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1161     LOCALHEAPINFO *pInfo;
1162     LOCALARENA *pArena, *pNext;
1163     LOCALHANDLEENTRY *pEntry = NULL;
1164     WORD arena, oldsize;
1165     HLOCAL16 hmem, blockhandle;
1166     LONG nextarena;
1167
1168     if (!handle) return 0;
1169     if(HANDLE_MOVEABLE(handle) &&
1170      ((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
1171         return 0;
1172
1173     TRACE("%04x %d %04x ds=%04x\n",
1174                    handle, size, flags, ds );
1175     if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1176
1177     if (HANDLE_FIXED( handle ))
1178         blockhandle = handle;
1179     else
1180     {
1181         pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1182         if(pEntry->flags == (LMEM_DISCARDED >> 8))
1183         {
1184             HLOCAL16 hl;
1185             if(pEntry->addr)
1186                 WARN("Dicarded block has non-zero addr.\n");
1187             TRACE("ReAllocating discarded block\n");
1188             if(size <= 4) size = 5;
1189             if (!(hl = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags)))
1190                 return 0;
1191             ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1192             pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1193             pEntry->addr = hl + sizeof(HLOCAL16);
1194             pEntry->flags = 0;
1195             pEntry->lock = 0;
1196             *(HLOCAL16 *)(ptr + hl) = handle;
1197             return handle;
1198         }
1199         if (((blockhandle = pEntry->addr) & 3) != 2)
1200         {
1201             ERR("(%04x,%04x): invalid handle\n",
1202                      ds, handle );
1203             return 0;
1204         }
1205         if(*((HLOCAL16 *)(ptr + blockhandle) - 1) != handle) {
1206             ERR("Back ptr to handle is invalid\n");
1207             return 0;
1208         }
1209     }
1210
1211     if (flags & LMEM_MODIFY)
1212     {
1213         if (HANDLE_MOVEABLE(handle))
1214         {
1215             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1216             pEntry->flags = (flags & 0x0f00) >> 8;
1217             TRACE("Changing flags to %x.\n", pEntry->flags);
1218         }
1219         return handle;
1220     }
1221
1222     if (!size)
1223     {
1224         if (flags & LMEM_MOVEABLE)
1225         {
1226             if (HANDLE_FIXED(handle))
1227             {
1228                 TRACE("Freeing fixed block.\n");
1229                 return LOCAL_Free( ds, handle );
1230             }
1231             else /* Moveable block */
1232             {
1233                 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1234                 if (pEntry->lock == 0)
1235                 {
1236                     /* discards moveable blocks */
1237                     TRACE("Discarding block\n");
1238                     LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
1239                     pEntry->addr = 0;
1240                     pEntry->flags = (LMEM_DISCARDED >> 8);
1241                     return handle;
1242                 }
1243             }
1244             return 0;
1245         }
1246         else if(flags == 0)
1247         {
1248             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1249             if (pEntry->lock == 0)
1250             {
1251                 /* Frees block */
1252                 return LOCAL_Free( ds, handle );
1253             }
1254         }
1255         return 0;
1256     }
1257
1258     arena = ARENA_HEADER( blockhandle );
1259     TRACE("arena is %04x\n", arena );
1260     pArena = ARENA_PTR( ptr, arena );
1261
1262     if(size <= 4) size = 5;
1263     oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1264     nextarena = LALIGN(blockhandle + size);
1265
1266       /* Check for size reduction */
1267
1268     if (nextarena <= pArena->next)
1269     {
1270         TRACE("size reduction, making new free block\n");
1271         LOCAL_ShrinkArena(ds, arena, nextarena - arena);
1272         TRACE("returning %04x\n", handle );
1273         return handle;
1274     }
1275
1276       /* Check if the next block is free and large enough */
1277
1278     pNext = ARENA_PTR( ptr, pArena->next );
1279     if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1280         (nextarena <= pNext->next))
1281     {
1282         TRACE("size increase, making new free block\n");
1283         LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
1284         TRACE("returning %04x\n", handle );
1285         return handle;
1286     }
1287
1288     /* Now we have to allocate a new block, but not if (fixed block or locked
1289        block) and no LMEM_MOVEABLE */
1290
1291     if (!(flags & LMEM_MOVEABLE))
1292     {
1293         if (HANDLE_FIXED(handle))
1294         {
1295             ERR("Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1296             return 0;
1297         }
1298         else
1299         {
1300             if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
1301             {
1302                 ERR("Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
1303                 return 0;
1304             }
1305         }
1306     }
1307     if(HANDLE_MOVEABLE(handle)) size += sizeof(HLOCAL16);
1308     hmem = LOCAL_GetBlock( ds, size, flags );
1309     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr                             */
1310     if(HANDLE_MOVEABLE(handle))         /* LOCAL_GetBlock might have triggered    */
1311     {                                   /* a compaction, which might in turn have */
1312       blockhandle = pEntry->addr ;      /* moved the very block we are resizing   */
1313       arena = ARENA_HEADER( blockhandle );   /* thus, we reload arena, too        */
1314     }
1315     if (!hmem)
1316     {
1317         /* Remove the block from the heap and try again */
1318         LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
1319         if (!buffer) return 0;
1320         memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
1321         LOCAL_FreeArena( ds, arena );
1322         if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
1323         {
1324             if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
1325             {
1326                 ERR("Can't restore saved block\n" );
1327                 HeapFree( GetProcessHeap(), 0, buffer );
1328                 return 0;
1329             }
1330             size = oldsize;
1331         }
1332         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1333         memcpy( ptr + hmem, buffer, oldsize );
1334         HeapFree( GetProcessHeap(), 0, buffer );
1335     }
1336     else
1337     {
1338         memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1339         LOCAL_FreeArena( ds, arena );
1340     }
1341     if (HANDLE_MOVEABLE( handle ))
1342     {
1343         TRACE("fixing handle\n");
1344         pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1345         pEntry->addr = hmem + sizeof(HLOCAL16);
1346         /* Back ptr should still be correct */
1347         if(*(HLOCAL16 *)(ptr + hmem) != handle)
1348             ERR("back ptr is invalid.\n");
1349         hmem = handle;
1350     }
1351     if (size == oldsize) hmem = 0;  /* Realloc failed */
1352     TRACE("returning %04x\n", hmem );
1353     return hmem;
1354 }
1355
1356
1357 /***********************************************************************
1358  *           LOCAL_InternalLock
1359  */
1360 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1361 {
1362     HLOCAL16 old_handle = handle;
1363
1364     if (HANDLE_MOVEABLE(handle))
1365     {
1366         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1367         if (pEntry->flags == LMEM_DISCARDED) return 0;
1368         if (pEntry->lock < 0xfe) pEntry->lock++;
1369         handle = pEntry->addr;
1370     }
1371     TRACE("%04x returning %04x\n",
1372                    old_handle, handle );
1373     return handle;
1374 }
1375
1376
1377 /***********************************************************************
1378  *           LOCAL_Lock
1379  */
1380 LPSTR LOCAL_Lock( HANDLE16 ds, HLOCAL16 handle )
1381 {
1382     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1383     return handle ? ptr + LOCAL_InternalLock( ptr, handle ) : NULL;
1384 }
1385
1386
1387 /***********************************************************************
1388  *           LOCAL_LockSegptr
1389  */
1390 SEGPTR LOCAL_LockSegptr( HANDLE16 ds, HLOCAL16 handle )
1391 {
1392     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1393     return PTR_SEG_OFF_TO_SEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1394 }
1395
1396
1397 /***********************************************************************
1398  *           LOCAL_Unlock
1399  */
1400 BOOL16 LOCAL_Unlock( HANDLE16 ds, HLOCAL16 handle )
1401 {
1402     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1403
1404     TRACE("%04x\n", handle );
1405     if (HANDLE_MOVEABLE(handle))
1406     {
1407         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1408         if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1409         /* For moveable block, return the new lock count */
1410         /* (see _Windows_Internals_ p. 197) */
1411         return --pEntry->lock;
1412     }
1413     else return FALSE;
1414 }
1415
1416
1417 /***********************************************************************
1418  *           LOCAL_Size
1419  *
1420  * Implementation of LocalSize().
1421  */
1422 WORD LOCAL_Size( HANDLE16 ds, HLOCAL16 handle )
1423 {
1424     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1425     LOCALARENA *pArena;
1426
1427     TRACE("%04x ds=%04x\n", handle, ds );
1428
1429     if (HANDLE_MOVEABLE( handle )) handle = *(WORD *)(ptr + handle);
1430     if (!handle) return 0;
1431     pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1432     return pArena->next - handle;
1433 }
1434
1435
1436 /***********************************************************************
1437  *           LOCAL_Flags
1438  *
1439  * Implementation of LocalFlags().
1440  */
1441 WORD LOCAL_Flags( HANDLE16 ds, HLOCAL16 handle )
1442 {
1443     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1444
1445     if (HANDLE_MOVEABLE(handle))
1446     {
1447         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1448         TRACE("(%04x,%04x): returning %04x\n",
1449                        ds, handle, pEntry->lock | (pEntry->flags << 8) );
1450         return pEntry->lock | (pEntry->flags << 8);
1451     }
1452     else
1453     {
1454         TRACE("(%04x,%04x): returning 0\n",
1455                        ds, handle );
1456         return 0;
1457     }
1458 }
1459
1460
1461 /***********************************************************************
1462  *           LOCAL_HeapSize
1463  *
1464  * Implementation of LocalHeapSize().
1465  */
1466 WORD LOCAL_HeapSize( HANDLE16 ds )
1467 {
1468     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1469     if (!pInfo) return 0;
1470     return pInfo->last - pInfo->first;
1471 }
1472
1473
1474 /***********************************************************************
1475  *           LOCAL_CountFree
1476  *
1477  * Implementation of LocalCountFree().
1478  */
1479 WORD LOCAL_CountFree( HANDLE16 ds )
1480 {
1481     WORD arena, total;
1482     LOCALARENA *pArena;
1483     LOCALHEAPINFO *pInfo;
1484     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1485
1486     if (!(pInfo = LOCAL_GetHeap( ds )))
1487     {
1488         ERR("(%04x): Local heap not found\n", ds );
1489         LOCAL_PrintHeap( ds );
1490         return 0;
1491     }
1492
1493     total = 0;
1494     arena = pInfo->first;
1495     pArena = ARENA_PTR( ptr, arena );
1496     for (;;)
1497     {
1498         arena = pArena->free_next;
1499         pArena = ARENA_PTR( ptr, arena );
1500         if (arena == pArena->free_next) break;
1501         total += pArena->size;
1502     }
1503     TRACE("(%04x): returning %d\n", ds, total);
1504     return total;
1505 }
1506
1507
1508 /***********************************************************************
1509  *           LOCAL_Handle
1510  *
1511  * Implementation of LocalHandle().
1512  */
1513 HLOCAL16 LOCAL_Handle( HANDLE16 ds, WORD addr )
1514 {
1515     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1516     LOCALHEAPINFO *pInfo;
1517     WORD table;
1518
1519     if (!(pInfo = LOCAL_GetHeap( ds )))
1520     {
1521         ERR("(%04x): Local heap not found\n", ds );
1522         LOCAL_PrintHeap( ds );
1523         return 0;
1524     }
1525
1526     /* Find the address in the entry tables */
1527
1528     table = pInfo->htable;
1529     while (table)
1530     {
1531         WORD count = *(WORD *)(ptr + table);
1532         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1533         for (; count > 0; count--, pEntry++)
1534             if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1535         table = *(WORD *)pEntry;
1536     }
1537
1538     return (HLOCAL16)addr;  /* Fixed block handle is addr */
1539 }
1540
1541
1542 /***********************************************************************
1543  *           LocalAlloc16   (KERNEL.5)
1544  */
1545 HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
1546 {
1547     HLOCAL16 ret = LOCAL_Alloc( CURRENT_DS, flags, size );
1548     CURRENT_STACK16->ecx = ret;  /* must be returned in cx too */
1549     return ret;
1550 }
1551
1552
1553 /***********************************************************************
1554  *           LocalReAlloc16   (KERNEL.6)
1555  */
1556 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1557 {
1558     return LOCAL_ReAlloc( CURRENT_DS, handle, size, flags );
1559 }
1560
1561
1562 /***********************************************************************
1563  *           LocalFree16   (KERNEL.7)
1564  */
1565 HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
1566 {
1567     return LOCAL_Free( CURRENT_DS, handle );
1568 }
1569
1570
1571 /***********************************************************************
1572  *           LocalLock16   (KERNEL.8)
1573  *
1574  * Note: only the offset part of the pointer is returned by the relay code.
1575  */
1576 SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
1577 {
1578     return LOCAL_LockSegptr( CURRENT_DS, handle );
1579 }
1580
1581
1582 /***********************************************************************
1583  *           LocalUnlock16   (KERNEL.9)
1584  */
1585 BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
1586 {
1587     return LOCAL_Unlock( CURRENT_DS, handle );
1588 }
1589
1590
1591 /***********************************************************************
1592  *           LocalSize16   (KERNEL.10)
1593  */
1594 UINT16 WINAPI LocalSize16( HLOCAL16 handle )
1595 {
1596     return LOCAL_Size( CURRENT_DS, handle );
1597 }
1598
1599
1600 /***********************************************************************
1601  *           LocalHandle16   (KERNEL.11)
1602  */
1603 HLOCAL16 WINAPI LocalHandle16( WORD addr )
1604 {
1605     return LOCAL_Handle( CURRENT_DS, addr );
1606 }
1607
1608
1609 /***********************************************************************
1610  *           LocalFlags16   (KERNEL.12)
1611  */
1612 UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
1613 {
1614     return LOCAL_Flags( CURRENT_DS, handle );
1615 }
1616
1617
1618 /***********************************************************************
1619  *           LocalCompact16   (KERNEL.13)
1620  */
1621 UINT16 WINAPI LocalCompact16( UINT16 minfree )
1622 {
1623     TRACE("%04x\n", minfree );
1624     return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1625 }
1626
1627
1628 /***********************************************************************
1629  *           LocalNotify   (KERNEL.14)
1630  *
1631  * Installs a callback function that is called for local memory events
1632  * Callback function prototype is
1633  * BOOL16 NotifyFunc(WORD wMsg, HLOCAL16 hMem, WORD wArg)
1634  * wMsg:
1635  * - LN_OUTOFMEM
1636  *   NotifyFunc seems to be responsible for allocating some memory,
1637  *   returns TRUE for success.
1638  *   wArg = number of bytes needed additionally
1639  * - LN_MOVE
1640  *   hMem = handle; wArg = old mem location
1641  * - LN_DISCARD
1642  *   NotifyFunc seems to be strongly encouraged to return TRUE,
1643  *   otherwise LogError() gets called.
1644  *   hMem = handle; wArg = flags
1645  */
1646 FARPROC16 WINAPI LocalNotify16( FARPROC16 func )
1647 {
1648     LOCALHEAPINFO *pInfo;
1649     FARPROC16 oldNotify;
1650     HANDLE16 ds = CURRENT_DS;
1651
1652     if (!(pInfo = LOCAL_GetHeap( ds )))
1653     {
1654         ERR("(%04x): Local heap not found\n", ds );
1655         LOCAL_PrintHeap( ds );
1656         return 0;
1657     }
1658     TRACE("(%04x): %08lx\n", ds, (DWORD)func );
1659     FIXME("Half implemented\n");
1660     oldNotify = pInfo->notify;
1661     pInfo->notify = func;
1662     return oldNotify;
1663 }
1664
1665
1666 /***********************************************************************
1667  *           LocalShrink16   (KERNEL.121)
1668  */
1669 UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1670 {
1671     TRACE("%04x %04x\n", handle, newsize );
1672     return 0;
1673 }
1674
1675
1676 /***********************************************************************
1677  *           GetHeapSpaces   (KERNEL.138)
1678  */
1679 DWORD WINAPI GetHeapSpaces16( HMODULE16 module )
1680 {
1681     NE_MODULE *pModule;
1682     WORD ds;
1683
1684     if (!(pModule = NE_GetPtr( module ))) return 0;
1685     ds =
1686     GlobalHandleToSel16((NE_SEG_TABLE( pModule ) + pModule->dgroup - 1)->hSeg);
1687     return MAKELONG( LOCAL_CountFree( ds ), LOCAL_HeapSize( ds ) );
1688 }
1689
1690
1691 /***********************************************************************
1692  *           LocalCountFree   (KERNEL.161)
1693  */
1694 WORD WINAPI LocalCountFree16(void)
1695 {
1696     return LOCAL_CountFree( CURRENT_DS );
1697 }
1698
1699
1700 /***********************************************************************
1701  *           LocalHeapSize   (KERNEL.162)
1702  */
1703 WORD WINAPI LocalHeapSize16(void)
1704 {
1705     TRACE("(void)\n" );
1706     return LOCAL_HeapSize( CURRENT_DS );
1707 }
1708
1709
1710 /***********************************************************************
1711  *           LocalHandleDelta   (KERNEL.310)
1712  */
1713 WORD WINAPI LocalHandleDelta16( WORD delta )
1714 {
1715     LOCALHEAPINFO *pInfo;
1716
1717     if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1718     {
1719         ERR("Local heap not found\n");
1720         LOCAL_PrintHeap( CURRENT_DS );
1721         return 0;
1722     }
1723     if (delta) pInfo->hdelta = delta;
1724     TRACE("returning %04x\n", pInfo->hdelta);
1725     return pInfo->hdelta;
1726 }
1727
1728
1729 /***********************************************************************
1730  *           LocalInfo   (TOOLHELP.56)
1731  */
1732 BOOL16 WINAPI LocalInfo16( LOCALINFO *pLocalInfo, HGLOBAL16 handle )
1733 {
1734     LOCALHEAPINFO *pInfo = LOCAL_GetHeap(SELECTOROF(WIN16_GlobalLock16(handle)));
1735     if (!pInfo) return FALSE;
1736     pLocalInfo->wcItems = pInfo->items;
1737     return TRUE;
1738 }
1739
1740
1741 /***********************************************************************
1742  *           LocalFirst   (TOOLHELP.57)
1743  */
1744 BOOL16 WINAPI LocalFirst16( LOCALENTRY *pLocalEntry, HGLOBAL16 handle )
1745 {
1746     WORD ds = GlobalHandleToSel16( handle );
1747     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1748     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1749     if (!pInfo) return FALSE;
1750
1751     pLocalEntry->hHandle   = pInfo->first + ARENA_HEADER_SIZE;
1752     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1753     pLocalEntry->wFlags    = LF_FIXED;
1754     pLocalEntry->wcLock    = 0;
1755     pLocalEntry->wType     = LT_NORMAL;
1756     pLocalEntry->hHeap     = handle;
1757     pLocalEntry->wHeapType = NORMAL_HEAP;
1758     pLocalEntry->wNext     = ARENA_PTR(ptr,pInfo->first)->next;
1759     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1760     return TRUE;
1761 }
1762
1763
1764 /***********************************************************************
1765  *           LocalNext   (TOOLHELP.58)
1766  */
1767 BOOL16 WINAPI LocalNext16( LOCALENTRY *pLocalEntry )
1768 {
1769     WORD ds = GlobalHandleToSel16( pLocalEntry->hHeap );
1770     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1771     LOCALARENA *pArena;
1772
1773     if (!LOCAL_GetHeap( ds )) return FALSE;
1774     if (!pLocalEntry->wNext) return FALSE;
1775     pArena = ARENA_PTR( ptr, pLocalEntry->wNext );
1776
1777     pLocalEntry->hHandle   = pLocalEntry->wNext + ARENA_HEADER_SIZE;
1778     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1779     pLocalEntry->wFlags    = (pArena->prev & 3) + 1;
1780     pLocalEntry->wcLock    = 0;
1781     pLocalEntry->wType     = LT_NORMAL;
1782     if (pArena->next != pLocalEntry->wNext)  /* last one? */
1783         pLocalEntry->wNext = pArena->next;
1784     else
1785         pLocalEntry->wNext = 0;
1786     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1787     return TRUE;
1788 }
1789
1790
1791 /***********************************************************************
1792  *           LocalAlloc   (KERNEL32.371)
1793  * RETURNS
1794  *      Handle: Success
1795  *      NULL: Failure
1796  */
1797 HLOCAL WINAPI LocalAlloc(
1798                 UINT flags, /* [in] Allocation attributes */
1799                 DWORD size    /* [in] Number of bytes to allocate */
1800 ) {
1801     return (HLOCAL)GlobalAlloc( flags, size );
1802 }
1803
1804
1805 /***********************************************************************
1806  *           LocalCompact   (KERNEL32.372)
1807  */
1808 UINT WINAPI LocalCompact( UINT minfree )
1809 {
1810     return 0;  /* LocalCompact does nothing in Win32 */
1811 }
1812
1813
1814 /***********************************************************************
1815  *           LocalFlags   (KERNEL32.374)
1816  * RETURNS
1817  *      Value specifying allocation flags and lock count.
1818  *      LMEM_INVALID_HANDLE: Failure
1819  */
1820 UINT WINAPI LocalFlags(
1821               HLOCAL handle /* [in] Handle of memory object */
1822 ) {
1823     return GlobalFlags( (HGLOBAL)handle );
1824 }
1825
1826
1827 /***********************************************************************
1828  *           LocalFree   (KERNEL32.375)
1829  * RETURNS
1830  *      NULL: Success
1831  *      Handle: Failure
1832  */
1833 HLOCAL WINAPI LocalFree(
1834                 HLOCAL handle /* [in] Handle of memory object */
1835 ) {
1836     return (HLOCAL)GlobalFree( (HGLOBAL)handle );
1837 }
1838
1839
1840 /***********************************************************************
1841  *           LocalHandle   (KERNEL32.376)
1842  * RETURNS
1843  *      Handle: Success
1844  *      NULL: Failure
1845  */
1846 HLOCAL WINAPI LocalHandle(
1847                 LPCVOID ptr /* [in] Address of local memory object */
1848 ) {
1849     return (HLOCAL)GlobalHandle( ptr );
1850 }
1851
1852
1853 /***********************************************************************
1854  *           LocalLock   (KERNEL32.377)
1855  * Locks a local memory object and returns pointer to the first byte
1856  * of the memory block.
1857  *
1858  * RETURNS
1859  *      Pointer: Success
1860  *      NULL: Failure
1861  */
1862 LPVOID WINAPI LocalLock(
1863               HLOCAL handle /* [in] Address of local memory object */
1864 ) {
1865     return GlobalLock( (HGLOBAL)handle );
1866 }
1867
1868
1869 /***********************************************************************
1870  *           LocalReAlloc   (KERNEL32.378)
1871  * RETURNS
1872  *      Handle: Success
1873  *      NULL: Failure
1874  */
1875 HLOCAL WINAPI LocalReAlloc(
1876                 HLOCAL handle, /* [in] Handle of memory object */
1877                 DWORD size,      /* [in] New size of block */
1878                 UINT flags     /* [in] How to reallocate object */
1879 ) {
1880     return (HLOCAL)GlobalReAlloc( (HGLOBAL)handle, size, flags );
1881 }
1882
1883
1884 /***********************************************************************
1885  *           LocalShrink   (KERNEL32.379)
1886  */
1887 UINT WINAPI LocalShrink( HGLOBAL handle, UINT newsize )
1888 {
1889     return 0;  /* LocalShrink does nothing in Win32 */
1890 }
1891
1892
1893 /***********************************************************************
1894  *           LocalSize   (KERNEL32.380)
1895  * RETURNS
1896  *      Size: Success
1897  *      0: Failure
1898  */
1899 UINT WINAPI LocalSize(
1900               HLOCAL handle /* [in] Handle of memory object */
1901 ) {
1902     return GlobalSize( (HGLOBAL)handle );
1903 }
1904
1905
1906 /***********************************************************************
1907  *           LocalUnlock   (KERNEL32.381)
1908  * RETURNS
1909  *      TRUE: Object is still locked
1910  *      FALSE: Object is unlocked
1911  */
1912 BOOL WINAPI LocalUnlock(
1913               HLOCAL handle /* [in] Handle of memory object */
1914 ) {
1915     return GlobalUnlock( (HGLOBAL)handle );
1916 }