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 "task.h"
  19 #include "heap.h"
  20 #include "instance.h"
  21 #include "local.h"
  22 #include "module.h"
  23 #include "stackframe.h"
  24 #include "toolhelp.h"
  25 #include "debugtools.h"
  26 #include "callback.h"
  27
  28 DEFAULT_DEBUG_CHANNEL(local);
  29 DECLARE_DEBUG_CHANNEL(heap);
  30
  31 typedef struct
  32 {
  33 /* Arena header */
  34     WORD prev;          /* Previous arena | arena type */
  35     WORD next;          /* Next arena */
  36 /* Start of the memory block or free-list info */
  37     WORD size;          /* Size of the free block */
  38     WORD free_prev;     /* Previous free block */
  39     WORD free_next;     /* Next free block */
  40 } LOCALARENA;
  41
  42 #define ARENA_HEADER_SIZE      4
  43 #define ARENA_HEADER( handle) ( ((handle) & ~3) - ARENA_HEADER_SIZE)
  44
  45   /* Arena types (stored in 'prev' field of the arena) */
  46 #define LOCAL_ARENA_FREE       0
  47 #define LOCAL_ARENA_FIXED      1
  48
  49 /* LocalNotify() msgs */
  50
  51 #define LN_OUTOFMEM     0
  52 #define LN_MOVE         1
  53 #define LN_DISCARD      2
  54
  55 /* Layout of a handle entry table
  56  *
  57  * WORD                     count of entries
  58  * LOCALHANDLEENTRY[count]  entries
  59  * WORD                     near ptr to next table
  60  */
  61 typedef struct
  62 {
  63     WORD addr;                /* Address of the MOVEABLE block */
  64     BYTE flags;               /* Flags for this block */
  65     BYTE lock;                /* Lock count */
  66 } LOCALHANDLEENTRY;
  67
  68 /*
  69  * We make addr = 4n + 2 and set *((WORD *)addr - 1) = &addr like Windows does
  70  * in case something actually relies on this.
  71  * Note the ARENA_HEADER(addr) still produces the desired result ie. 4n - 4
  72  *
  73  * An unused handle has lock = flags = 0xff. In windows addr is that of next
  74  * free handle, at the moment in wine we set it to 0.
  75  *
  76  * A discarded block's handle has lock = addr = 0 and flags = 0x40
  77  * (LMEM_DISCARDED >> 8)
  78  */
  79
  80 #include "pshpack1.h"
  81
  82 typedef struct
  83 {
  84     WORD check;                 /* 00 Heap checking flag */
  85     WORD freeze;                /* 02 Heap frozen flag */
  86     WORD items;                 /* 04 Count of items on the heap */
  87     WORD first;                 /* 06 First item of the heap */
  88     WORD pad1;                  /* 08 Always 0 */
  89     WORD last;                  /* 0a Last item of the heap */
  90     WORD pad2;                  /* 0c Always 0 */
  91     BYTE ncompact;              /* 0e Compactions counter */
  92     BYTE dislevel;              /* 0f Discard level */
  93     DWORD distotal;             /* 10 Total bytes discarded */
  94     WORD htable;                /* 14 Pointer to handle table */
  95     WORD hfree;                 /* 16 Pointer to free handle table */
  96     WORD hdelta;                /* 18 Delta to expand the handle table */
  97     WORD expand;                /* 1a Pointer to expand function (unused) */
  98     WORD pstat;                 /* 1c Pointer to status structure (unused) */
  99     FARPROC16 notify WINE_PACKED; /* 1e Pointer to LocalNotify() function */
 100     WORD lock;                  /* 22 Lock count for the heap */
 101     WORD extra;                 /* 24 Extra bytes to allocate when expanding */
 102     WORD minsize;               /* 26 Minimum size of the heap */
 103     WORD magic;                 /* 28 Magic number */
 104 } LOCALHEAPINFO;
 105
 106 #include "poppack.h"
 107
 108 #define LOCAL_HEAP_MAGIC  0x484c  /* 'LH' */
 109
 110 WORD USER_HeapSel = 0;  /* USER 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 /* ### start build ### */
 126 extern WORD CALLBACK LOCAL_CallTo16_word_www(FARPROC16,WORD,HLOCAL16,WORD);
 127 /* ### stop build ### */
 128
 129 /***********************************************************************
 130  *           LOCAL_GetHeap
 131  *
 132  * Return a pointer to the local heap, making sure it exists.
 133  */
 134 static LOCALHEAPINFO *LOCAL_GetHeap( HANDLE16 ds )
 135 {
 136     LOCALHEAPINFO *pInfo;
 137     INSTANCEDATA *ptr = MapSL( MAKESEGPTR( ds, 0 ));
 138     TRACE("Heap at %p, %04x\n", ptr, (ptr != NULL ? ptr->heap : 0xFFFF));
 139     if (!ptr || !ptr->heap) return NULL;
 140     if (IsBadReadPtr16( (SEGPTR)MAKELONG(ptr->heap,ds), sizeof(LOCALHEAPINFO)))
 141     {
 142         WARN("Bad pointer\n");
 143         return NULL;
 144     }
 145     pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
 146     if (pInfo->magic != LOCAL_HEAP_MAGIC)
 147     {
 148         WARN("Bad magic\n");
 149         return NULL;
 150     }
 151     return pInfo;
 152 }
 153
 154
 155 /***********************************************************************
 156  *           LOCAL_MakeBlockFree
 157  *
 158  * Make a block free, inserting it in the free-list.
 159  * 'block' is the handle of the block arena; 'baseptr' points to
 160  * the beginning of the data segment containing the heap.
 161  */
 162 static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
 163 {
 164     LOCALARENA *pArena, *pNext;
 165     WORD next;
 166
 167       /* Mark the block as free */
 168
 169     pArena = ARENA_PTR( baseptr, block );
 170     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
 171     pArena->size = pArena->next - block;
 172
 173       /* Find the next free block (last block is always free) */
 174
 175     next = pArena->next;
 176     for (;;)
 177     {
 178         pNext = ARENA_PTR( baseptr, next );
 179         if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
 180         next = pNext->next;
 181     }
 182
 183     TRACE("%04x, next %04x\n", block, next );
 184       /* Insert the free block in the free-list */
 185
 186     pArena->free_prev = pNext->free_prev;
 187     pArena->free_next = next;
 188     ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
 189     pNext->free_prev  = block;
 190 }
 191
 192
 193 /***********************************************************************
 194  *           LOCAL_RemoveFreeBlock
 195  *
 196  * Remove a block from the free-list.
 197  * 'block' is the handle of the block arena; 'baseptr' points to
 198  * the beginning of the data segment containing the heap.
 199  */
 200 static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
 201 {
 202       /* Mark the block as fixed */
 203
 204     LOCALARENA *pArena = ARENA_PTR( baseptr, block );
 205     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
 206
 207       /* Remove it from the list */
 208
 209     ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
 210     ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
 211 }
 212
 213
 214 /***********************************************************************
 215  *           LOCAL_AddBlock
 216  *
 217  * Insert a new block in the heap.
 218  * 'new' is the handle of the new block arena; 'baseptr' points to
 219  * the beginning of the data segment containing the heap; 'prev' is
 220  * the block before the new one.
 221  */
 222 static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
 223 {
 224     LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
 225     LOCALARENA *pNew  = ARENA_PTR( baseptr, new );
 226
 227     pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
 228     pNew->next = pPrev->next;
 229     ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
 230     ARENA_PTR(baseptr,pPrev->next)->prev |= new;
 231     pPrev->next = new;
 232 }
 233
 234
 235 /***********************************************************************
 236  *           LOCAL_RemoveBlock
 237  *
 238  * Remove a block from the heap.
 239  * 'block' is the handle of the block arena; 'baseptr' points to
 240  * the beginning of the data segment containing the heap.
 241  */
 242 static void LOCAL_RemoveBlock( char *baseptr, WORD block )
 243 {
 244     LOCALARENA *pArena, *pTmp;
 245
 246       /* Remove the block from the free-list */
 247
 248     TRACE("\n");
 249     pArena = ARENA_PTR( baseptr, block );
 250     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 251         LOCAL_RemoveFreeBlock( baseptr, block );
 252
 253       /* If the previous block is free, expand its size */
 254
 255     pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
 256     if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
 257         pTmp->size += pArena->next - block;
 258
 259       /* Remove the block from the linked list */
 260
 261     pTmp->next = pArena->next;
 262     pTmp = ARENA_PTR( baseptr, pArena->next );
 263     pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
 264 }
 265
 266
 267 /***********************************************************************
 268  *           LOCAL_PrintHeap
 269  */
 270 static void LOCAL_PrintHeap( HANDLE16 ds )
 271 {
 272     char *ptr;
 273     LOCALHEAPINFO *pInfo;
 274     WORD arena;
 275
 276     /* FIXME - the test should be done when calling the function!
 277                plus is not clear that we should print this info
 278                only when TRACE_ON is on! */
 279     if(!TRACE_ON(local)) return;
 280
 281     ptr = MapSL( MAKESEGPTR( ds, 0 ));
 282     pInfo = LOCAL_GetHeap( ds );
 283
 284     if (!pInfo)
 285     {
 286         DPRINTF( "Local Heap corrupted!  ds=%04x\n", ds );
 287         return;
 288     }
 289     DPRINTF( "Local Heap  ds=%04x first=%04x last=%04x items=%d\n",
 290              ds, pInfo->first, pInfo->last, pInfo->items );
 291
 292     arena = pInfo->first;
 293     for (;;)
 294     {
 295         LOCALARENA *pArena = ARENA_PTR(ptr,arena);
 296         DPRINTF( "  %04x: prev=%04x next=%04x type=%d\n", arena,
 297               pArena->prev & ~3, pArena->next, pArena->prev & 3 );
 298         if (arena == pInfo->first)
 299         {
 300             DPRINTF( "        size=%d free_prev=%04x free_next=%04x\n",
 301                      pArena->size, pArena->free_prev, pArena->free_next );
 302         }
 303         if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 304         {
 305             DPRINTF( "        size=%d free_prev=%04x free_next=%04x\n",
 306                      pArena->size, pArena->free_prev, pArena->free_next );
 307             if (pArena->next == arena) break;  /* last one */
 308             if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
 309             {
 310                 DPRINTF( "*** arena->free_next->free_prev != arena\n" );
 311                 break;
 312             }
 313         }
 314         if (pArena->next == arena)
 315         {
 316             DPRINTF( "*** last block is not marked free\n" );
 317             break;
 318         }
 319         if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
 320         {
 321             DPRINTF( "*** arena->next->prev != arena (%04x, %04x)\n",
 322                      pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
 323             break;
 324         }
 325         arena = pArena->next;
 326     }
 327 }
 328
 329
 330 /***********************************************************************
 331  *           LocalInit   (KERNEL.4)
 332  */
 333 BOOL16 WINAPI LocalInit16( HANDLE16 selector, WORD start, WORD end )
 334 {
 335     char *ptr;
 336     WORD heapInfoArena, freeArena, lastArena;
 337     LOCALHEAPINFO *pHeapInfo;
 338     LOCALARENA *pArena, *pFirstArena, *pLastArena;
 339     NE_MODULE *pModule;
 340     BOOL16 ret = FALSE;
 341
 342       /* The initial layout of the heap is: */
 343       /* - first arena         (FIXED)      */
 344       /* - heap info structure (FIXED)      */
 345       /* - large free block    (FREE)       */
 346       /* - last arena          (FREE)       */
 347
 348     TRACE("%04x %04x-%04x\n", selector, start, end);
 349     if (!selector) selector = CURRENT_DS;
 350
 351     if (TRACE_ON(heap))
 352     {
 353         /* If TRACE_ON(heap) is set, the global heap blocks are */
 354         /* cleared before use, so we can test for double initialization. */
 355         if (LOCAL_GetHeap(selector))
 356         {
 357             ERR("Heap %04x initialized twice.\n", selector);
 358             LOCAL_PrintHeap(selector);
 359         }
 360     }
 361
 362     if (start == 0)
 363     {
 364         /* start == 0 means: put the local heap at the end of the segment */
 365
 366         DWORD size = GlobalSize16( GlobalHandle16( selector ) );
 367         start = (WORD)(size > 0xffff ? 0xffff : size) - 1;
 368         if ( end > 0xfffe ) end = 0xfffe;
 369         start -= end;
 370         end += start;
 371
 372         /* Paranoid check */
 373
 374         if ((pModule = NE_GetPtr( GlobalHandle16( selector ) )))
 375         {
 376             SEGTABLEENTRY *pSeg = NE_SEG_TABLE( pModule );
 377             int segNr;
 378
 379             for ( segNr = 0; segNr < pModule->seg_count; segNr++, pSeg++ )
 380                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 381                     break;
 382
 383             if ( segNr < pModule->seg_count )
 384             {
 385                 WORD minsize = pSeg->minsize;
 386                 if ( pModule->ss == segNr+1 )
 387                     minsize += pModule->stack_size;
 388
 389                 TRACE(" new start %04x, minstart: %04x\n", start, minsize);
 390             }
 391         }
 392     }
 393     ptr = MapSL( MAKESEGPTR( selector, 0 ) );
 394
 395     start = LALIGN( max( start, sizeof(INSTANCEDATA) ) );
 396     heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
 397     freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
 398                         + sizeof(LOCALHEAPINFO) );
 399     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 400
 401       /* Make sure there's enough space.       */
 402
 403     if (freeArena + sizeof(LOCALARENA) >= lastArena) goto done;
 404
 405       /* Initialise the first arena */
 406
 407     pFirstArena = ARENA_PTR( ptr, start );
 408     pFirstArena->prev      = start | LOCAL_ARENA_FIXED;
 409     pFirstArena->next      = heapInfoArena;
 410     pFirstArena->size      = LALIGN(sizeof(LOCALARENA));
 411     pFirstArena->free_prev = start;  /* this one */
 412     pFirstArena->free_next = freeArena;
 413
 414       /* Initialise the arena of the heap info structure */
 415
 416     pArena = ARENA_PTR( ptr, heapInfoArena );
 417     pArena->prev = start | LOCAL_ARENA_FIXED;
 418     pArena->next = freeArena;
 419
 420       /* Initialise the heap info structure */
 421
 422     pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
 423     memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
 424     pHeapInfo->items   = 4;
 425     pHeapInfo->first   = start;
 426     pHeapInfo->last    = lastArena;
 427     pHeapInfo->htable  = 0;
 428     pHeapInfo->hdelta  = 0x20;
 429     pHeapInfo->extra   = 0x200;
 430     pHeapInfo->minsize = lastArena - freeArena;
 431     pHeapInfo->magic   = LOCAL_HEAP_MAGIC;
 432
 433       /* Initialise the large free block */
 434
 435     pArena = ARENA_PTR( ptr, freeArena );
 436     pArena->prev      = heapInfoArena | LOCAL_ARENA_FREE;
 437     pArena->next      = lastArena;
 438     pArena->size      = lastArena - freeArena;
 439     pArena->free_prev = start;
 440     pArena->free_next = lastArena;
 441
 442       /* Initialise the last block */
 443
 444     pLastArena = ARENA_PTR( ptr, lastArena );
 445     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 446     pLastArena->next      = lastArena;  /* this one */
 447     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 448     pLastArena->free_prev = freeArena;
 449     pLastArena->free_next = lastArena;  /* this one */
 450
 451       /* Store the local heap address in the instance data */
 452
 453     ((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
 454     LOCAL_PrintHeap( selector );
 455     ret = TRUE;
 456
 457  done:
 458     CURRENT_STACK16->ecx = ret;  /* must be returned in cx too */
 459     return ret;
 460 }
 461
 462 /***********************************************************************
 463  *           LOCAL_GrowHeap
 464  */
 465 static BOOL16 LOCAL_GrowHeap( HANDLE16 ds )
 466 {
 467     HANDLE16 hseg;
 468     LONG oldsize;
 469     LONG end;
 470     LOCALHEAPINFO *pHeapInfo;
 471     WORD freeArena, lastArena;
 472     LOCALARENA *pArena, *pLastArena;
 473     char *ptr;
 474
 475     hseg = GlobalHandle16( ds );
 476     /* maybe mem allocated by Virtual*() ? */
 477     if (!hseg) return FALSE;
 478
 479     oldsize = GlobalSize16( hseg );
 480     /* if nothing can be gained, return */
 481     if (oldsize > 0xfff0) return FALSE;
 482     hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
 483     ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 484     pHeapInfo = LOCAL_GetHeap( ds );
 485     if (pHeapInfo == NULL) {
 486         ERR("Heap not found\n" );
 487         return FALSE;
 488     }
 489     end = GlobalSize16( hseg );
 490     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 491
 492       /* Update the HeapInfo */
 493     pHeapInfo->items++;
 494     freeArena = pHeapInfo->last;
 495     pHeapInfo->last = lastArena;
 496     pHeapInfo->minsize += end - oldsize;
 497
 498       /* grow the old last block */
 499     pArena = ARENA_PTR( ptr, freeArena );
 500     pArena->size      = lastArena - freeArena;
 501     pArena->next      = lastArena;
 502     pArena->free_next = lastArena;
 503
 504       /* Initialise the new last block */
 505
 506     pLastArena = ARENA_PTR( ptr, lastArena );
 507     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 508     pLastArena->next      = lastArena;  /* this one */
 509     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 510     pLastArena->free_prev = freeArena;
 511     pLastArena->free_next = lastArena;  /* this one */
 512
 513     /* If block before freeArena is also free then merge them */
 514     if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
 515     {
 516         LOCAL_RemoveBlock(ptr, freeArena);
 517         pHeapInfo->items--;
 518     }
 519
 520     TRACE("Heap expanded\n" );
 521     LOCAL_PrintHeap( ds );
 522     return TRUE;
 523 }
 524
 525
 526 /***********************************************************************
 527  *           LOCAL_FreeArena
 528  */
 529 static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
 530 {
 531     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 532     LOCALHEAPINFO *pInfo;
 533     LOCALARENA *pArena, *pPrev, *pNext;
 534
 535     TRACE("%04x ds=%04x\n", arena, ds );
 536     if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
 537
 538     pArena = ARENA_PTR( ptr, arena );
 539     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 540     {
 541         /* shouldn't happen */
 542         ERR("Trying to free block %04x twice!\n",
 543                  arena );
 544         LOCAL_PrintHeap( ds );
 545         return arena;
 546     }
 547
 548       /* Check if we can merge with the previous block */
 549
 550     pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
 551     pNext = ARENA_PTR( ptr, pArena->next );
 552     if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
 553     {
 554         arena  = pArena->prev & ~3;
 555         pArena = pPrev;
 556         LOCAL_RemoveBlock( ptr, pPrev->next );
 557         pInfo->items--;
 558     }
 559     else  /* Make a new free block */
 560     {
 561         LOCAL_MakeBlockFree( ptr, arena );
 562     }
 563
 564       /* Check if we can merge with the next block */
 565
 566     if ((pArena->next == pArena->free_next) &&
 567         (pArena->next != pInfo->last))
 568     {
 569         LOCAL_RemoveBlock( ptr, pArena->next );
 570         pInfo->items--;
 571     }
 572     return 0;
 573 }
 574
 575
 576 /***********************************************************************
 577  *           LOCAL_ShrinkArena
 578  *
 579  * Shrink an arena by creating a free block at its end if possible.
 580  * 'size' includes the arena header, and must be aligned.
 581  */
 582 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
 583 {
 584     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 585     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 586
 587     if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
 588     {
 589         LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
 590         if (!pInfo) return;
 591         LOCAL_AddBlock( ptr, arena, arena + size );
 592         pInfo->items++;
 593         LOCAL_FreeArena( ds, arena + size );
 594     }
 595 }
 596
 597
 598 /***********************************************************************
 599  *           LOCAL_GrowArenaDownward
 600  *
 601  * Grow an arena downward by using the previous arena (must be free).
 602  */
 603 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
 604 {
 605     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 606     LOCALHEAPINFO *pInfo;
 607     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 608     WORD prevArena = pArena->prev & ~3;
 609     LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
 610     WORD offset, size;
 611     char *p;
 612
 613     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 614     offset = pPrevArena->size;
 615     size = pArena->next - arena - ARENA_HEADER_SIZE;
 616     LOCAL_RemoveFreeBlock( ptr, prevArena );
 617     LOCAL_RemoveBlock( ptr, arena );
 618     pInfo->items--;
 619     p = (char *)pPrevArena + ARENA_HEADER_SIZE;
 620     while (offset < size)
 621     {
 622         memcpy( p, p + offset, offset );
 623         p += offset;
 624         size -= offset;
 625     }
 626     if (size) memcpy( p, p + offset, size );
 627     LOCAL_ShrinkArena( ds, prevArena, newsize );
 628 }
 629
 630
 631
 632 /***********************************************************************
 633  *           LOCAL_GrowArenaUpward
 634  *
 635  * Grow an arena upward by using the next arena (must be free and big
 636  * enough). Newsize includes the arena header and must be aligned.
 637  */
 638 static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
 639 {
 640     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 641     LOCALHEAPINFO *pInfo;
 642     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 643     WORD nextArena = pArena->next;
 644
 645     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 646     LOCAL_RemoveBlock( ptr, nextArena );
 647     pInfo->items--;
 648     LOCAL_ShrinkArena( ds, arena, newsize );
 649 }
 650
 651
 652 /***********************************************************************
 653  *           LOCAL_GetFreeSpace
 654  */
 655 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
 656 {
 657     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 658     LOCALHEAPINFO *pInfo;
 659     LOCALARENA *pArena;
 660     WORD arena;
 661     WORD freespace = 0;
 662
 663     if (!(pInfo = LOCAL_GetHeap( ds )))
 664     {
 665         ERR("Local heap not found\n" );
 666         LOCAL_PrintHeap(ds);
 667         return 0;
 668     }
 669     arena = pInfo->first;
 670     pArena = ARENA_PTR( ptr, arena );
 671     while (arena != pArena->free_next)
 672     {
 673         arena = pArena->free_next;
 674         pArena = ARENA_PTR( ptr, arena );
 675         if (pArena->size >= freespace) freespace = pArena->size;
 676     }
 677     /* FIXME doesn't yet calculate space that would become free if everything
 678        were discarded when countdiscard == 1 */
 679     if (freespace < ARENA_HEADER_SIZE) freespace = 0;
 680     else freespace -= ARENA_HEADER_SIZE;
 681     return freespace;
 682 }
 683
 684
 685 /***********************************************************************
 686  *           LOCAL_Compact
 687  */
 688 WORD LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
 689 {
 690     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 691     LOCALHEAPINFO *pInfo;
 692     LOCALARENA *pArena, *pMoveArena, *pFinalArena;
 693     WORD arena, movearena, finalarena, table;
 694     WORD count, movesize, size;
 695     WORD freespace;
 696     LOCALHANDLEENTRY *pEntry;
 697
 698     if (!(pInfo = LOCAL_GetHeap( ds )))
 699     {
 700         ERR("Local heap not found\n" );
 701         LOCAL_PrintHeap(ds);
 702         return 0;
 703     }
 704     TRACE("ds = %04x, minfree = %04x, flags = %04x\n",
 705                  ds, minfree, flags);
 706     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 707     if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
 708     {
 709         TRACE("Returning %04x.\n", freespace);
 710         return freespace;
 711     }
 712     TRACE("Compacting heap %04x.\n", ds);
 713     table = pInfo->htable;
 714     while(table)
 715     {
 716         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 717         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 718         {
 719             if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
 720             {
 721                 /* OK we can move this one if we want */
 722                 TRACE("handle %04x (block %04x) can be moved.\n",
 723                              (WORD)((char *)pEntry - ptr), pEntry->addr);
 724                 movearena = ARENA_HEADER(pEntry->addr);
 725                 pMoveArena = ARENA_PTR(ptr, movearena);
 726                 movesize = pMoveArena->next - movearena;
 727                 arena = pInfo->first;
 728                 pArena = ARENA_PTR(ptr, arena);
 729                 size = 0xffff;
 730                 finalarena = 0;
 731                 /* Try to find the smallest arena that will do, */
 732                 /* which is below us in memory */
 733                 for(;;)
 734                 {
 735                     arena = pArena->free_next;
 736                     pArena = ARENA_PTR(ptr, arena);
 737                     if(arena >= movearena)
 738                         break;
 739                     if(arena == pArena->free_next)
 740                         break;
 741                     if((pArena->size >= movesize) && (pArena->size < size))
 742                     {
 743                         size = pArena->size;
 744                         finalarena = arena;
 745                     }
 746                 }
 747                 if (finalarena) /* Actually got somewhere to move */
 748                 {
 749                     TRACE("Moving it to %04x.\n", finalarena);
 750                     pFinalArena = ARENA_PTR(ptr, finalarena);
 751                     size = pFinalArena->size;
 752                     LOCAL_RemoveFreeBlock(ptr, finalarena);
 753                     LOCAL_ShrinkArena( ds, finalarena, movesize );
 754                     /* Copy the arena to it's new location */
 755                     memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
 756                            (char *)pMoveArena + ARENA_HEADER_SIZE,
 757                            movesize - ARENA_HEADER_SIZE );
 758                     /* Free the old location */
 759                     LOCAL_FreeArena(ds, movearena);
 760                     if (pInfo->notify)
 761                         LOCAL_CallTo16_word_www(pInfo->notify, LN_MOVE,
 762                         (WORD)((char *)pEntry - ptr), pEntry->addr);
 763                     /* Update handle table entry */
 764                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 765                 }
 766                 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
 767                                == LOCAL_ARENA_FREE)
 768                 {
 769                     /* Previous arena is free (but < movesize)  */
 770                     /* so we can 'slide' movearena down into it */
 771                     finalarena = pMoveArena->prev & ~3;
 772                     LOCAL_GrowArenaDownward( ds, movearena, movesize );
 773                     /* Update handle table entry */
 774                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 775                 }
 776             }
 777         }
 778         table = *(WORD *)pEntry;
 779     }
 780     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 781     if(freespace >= minfree || (flags & LMEM_NODISCARD))
 782     {
 783         TRACE("Returning %04x.\n", freespace);
 784         return freespace;
 785     }
 786
 787     table = pInfo->htable;
 788     while(table)
 789     {
 790         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 791         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 792         {
 793             if(pEntry->addr && pEntry->lock == 0 &&
 794              (pEntry->flags & (LMEM_DISCARDABLE >> 8)))
 795             {
 796                 TRACE("Discarding handle %04x (block %04x).\n",
 797                               (char *)pEntry - ptr, pEntry->addr);
 798                 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
 799                 if (pInfo->notify)
 800                     LOCAL_CallTo16_word_www(pInfo->notify, LN_DISCARD,
 801                         (char *)pEntry - ptr, pEntry->flags);
 802                 pEntry->addr = 0;
 803                 pEntry->flags = (LMEM_DISCARDED >> 8);
 804             }
 805         }
 806         table = *(WORD *)pEntry;
 807     }
 808     return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
 809 }
 810
 811
 812 /***********************************************************************
 813  *           LOCAL_FindFreeBlock
 814  */
 815 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
 816 {
 817     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 818     LOCALHEAPINFO *pInfo;
 819     LOCALARENA *pArena;
 820     WORD arena;
 821
 822     if (!(pInfo = LOCAL_GetHeap( ds )))
 823     {
 824         ERR("Local heap not found\n" );
 825         LOCAL_PrintHeap(ds);
 826         return 0;
 827     }
 828
 829     arena = pInfo->first;
 830     pArena = ARENA_PTR( ptr, arena );
 831     for (;;) {
 832         arena = pArena->free_next;
 833         pArena = ARENA_PTR( ptr, arena );
 834         if (arena == pArena->free_next) break;
 835         if (pArena->size >= size) return arena;
 836     }
 837     TRACE("not enough space\n" );
 838     LOCAL_PrintHeap(ds);
 839     return 0;
 840 }
 841
 842
 843 /***********************************************************************
 844  *           get_heap_name
 845  */
 846 static const char *get_heap_name( WORD ds )
 847 {
 848     HINSTANCE16 inst = LoadLibrary16( "GDI" );
 849     if (ds == GlobalHandleToSel16( inst ))
 850     {
 851         FreeLibrary16( inst );
 852         return "GDI";
 853     }
 854     FreeLibrary16( inst );
 855     inst = LoadLibrary16( "USER" );
 856     if (ds == GlobalHandleToSel16( inst ))
 857     {
 858         FreeLibrary16( inst );
 859         return "USER";
 860     }
 861     FreeLibrary16( inst );
 862     return "local";
 863 }
 864
 865 /***********************************************************************
 866  *           LOCAL_GetBlock
 867  * The segment may get moved around in this function, so all callers
 868  * should reset their pointer variables.
 869  */
 870 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
 871 {
 872     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 873     LOCALHEAPINFO *pInfo;
 874     LOCALARENA *pArena;
 875     WORD arena;
 876
 877     if (!(pInfo = LOCAL_GetHeap( ds )))
 878     {
 879         ERR("Local heap not found\n");
 880         LOCAL_PrintHeap(ds);
 881         return 0;
 882     }
 883
 884     size += ARENA_HEADER_SIZE;
 885     size = LALIGN( max( size, sizeof(LOCALARENA) ) );
 886
 887 #if 0
 888 notify_done:
 889 #endif
 890       /* Find a suitable free block */
 891     arena = LOCAL_FindFreeBlock( ds, size );
 892     if (arena == 0) {
 893         /* no space: try to make some */
 894         LOCAL_Compact( ds, size, flags );
 895         arena = LOCAL_FindFreeBlock( ds, size );
 896     }
 897     if (arena == 0) {
 898         /* still no space: try to grow the segment */
 899         if (!(LOCAL_GrowHeap( ds )))
 900         {
 901 #if 0
 902             /* FIXME: doesn't work correctly yet */
 903             if ((pInfo->notify) && (LOCAL_CallTo16_word_www(pInfo->notify, LN_OUTOFMEM, ds - 20, size))) /* FIXME: "size" correct ? (should indicate bytes needed) */
 904                 goto notify_done;
 905 #endif
 906             return 0;
 907         }
 908         ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 909         pInfo = LOCAL_GetHeap( ds );
 910         arena = LOCAL_FindFreeBlock( ds, size );
 911     }
 912     if (arena == 0) {
 913         ERR( "not enough space in %s heap %04x for %d bytes\n",
 914              get_heap_name(ds), ds, size );
 915 #if 0
 916         if ((pInfo->notify) &&
 917         /* FIXME: "size" correct ? (should indicate bytes needed) */
 918         (LOCAL_CallTo16_word_www(pInfo->notify, LN_OUTOFMEM, ds, size)))
 919             goto notify_done;
 920 #endif
 921         return 0;
 922     }
 923
 924       /* Make a block out of the free arena */
 925     pArena = ARENA_PTR( ptr, arena );
 926     TRACE("size = %04x, arena %04x size %04x\n",
 927                   size, arena, pArena->size );
 928     LOCAL_RemoveFreeBlock( ptr, arena );
 929     LOCAL_ShrinkArena( ds, arena, size );
 930
 931     if (flags & LMEM_ZEROINIT)
 932         memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
 933     return arena + ARENA_HEADER_SIZE;
 934 }
 935
 936
 937 /***********************************************************************
 938  *           LOCAL_NewHTable
 939  */
 940 static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
 941 {
 942     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 943     LOCALHEAPINFO *pInfo;
 944     LOCALHANDLEENTRY *pEntry;
 945     HLOCAL16 handle;
 946     int i;
 947
 948     TRACE("\n" );
 949     if (!(pInfo = LOCAL_GetHeap( ds )))
 950     {
 951         ERR("Local heap not found\n");
 952         LOCAL_PrintHeap(ds);
 953         return FALSE;
 954     }
 955
 956     if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
 957                                    + 2 * sizeof(WORD), LMEM_FIXED )))
 958         return FALSE;
 959     if (!(ptr = MapSL( MAKESEGPTR( ds, 0 ) )))
 960         ERR("ptr == NULL after GetBlock.\n");
 961     if (!(pInfo = LOCAL_GetHeap( ds )))
 962         ERR("pInfo == NULL after GetBlock.\n");
 963
 964     /* Fill the entry table */
 965
 966     *(WORD *)(ptr + handle) = pInfo->hdelta;
 967     pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
 968     for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
 969         pEntry->lock = pEntry->flags = 0xff;
 970         pEntry->addr = 0;
 971     }
 972     *(WORD *)pEntry = pInfo->htable;
 973     pInfo->htable = handle;
 974     return TRUE;
 975 }
 976
 977
 978 /***********************************************************************
 979  *           LOCAL_GetNewHandleEntry
 980  */
 981 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
 982 {
 983     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
 984     LOCALHEAPINFO *pInfo;
 985     LOCALHANDLEENTRY *pEntry = NULL;
 986     WORD table;
 987
 988     if (!(pInfo = LOCAL_GetHeap( ds )))
 989     {
 990         ERR("Local heap not found\n");
 991         LOCAL_PrintHeap(ds);
 992         return 0;
 993     }
 994
 995     /* Find a free slot in existing tables */
 996
 997     table = pInfo->htable;
 998     while (table)
 999     {
1000         WORD count = *(WORD *)(ptr + table);
1001         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1002         for (; count > 0; count--, pEntry++)
1003             if (pEntry->lock == 0xff) break;
1004         if (count) break;
1005         table = *(WORD *)pEntry;
1006     }
1007
1008     if (!table)  /* We need to create a new table */
1009     {
1010         if (!LOCAL_NewHTable( ds )) return 0;
1011         ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1012         pInfo = LOCAL_GetHeap( ds );
1013         pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
1014     }
1015
1016     /* Now allocate this entry */
1017
1018     pEntry->lock = 0;
1019     pEntry->flags = 0;
1020     TRACE("(%04x): %04x\n",
1021                    ds, ((char *)pEntry - ptr) );
1022     return (HLOCAL16)((char *)pEntry - ptr);
1023 }
1024
1025
1026 /***********************************************************************
1027  *           LOCAL_FreeHandleEntry
1028  *
1029  * Free a handle table entry.
1030  */
1031 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
1032 {
1033     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1034     LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1035     LOCALHEAPINFO *pInfo;
1036     WORD *pTable;
1037     WORD table, count, i;
1038
1039     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
1040
1041     /* Find the table where this handle comes from */
1042
1043     pTable = &pInfo->htable;
1044     while (*pTable)
1045     {
1046         WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
1047         if ((handle >= *pTable + sizeof(WORD)) &&
1048             (handle < *pTable + sizeof(WORD) + size)) break;  /* Found it */
1049         pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
1050     }
1051     if (!*pTable)
1052     {
1053         ERR("Invalid entry %04x\n", handle);
1054         LOCAL_PrintHeap( ds );
1055         return;
1056     }
1057
1058     /* Make the entry free */
1059
1060     pEntry->addr = 0;  /* just in case */
1061     pEntry->lock = 0xff;
1062     pEntry->flags = 0xff;
1063     /* Now check if all entries in this table are free */
1064
1065     table = *pTable;
1066     pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1067     count = *(WORD *)(ptr + table);
1068     for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
1069
1070     /* Remove the table from the linked list and free it */
1071
1072     TRACE("(%04x): freeing table %04x\n",
1073                    ds, table);
1074     *pTable = *(WORD *)pEntry;
1075     LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
1076 }
1077
1078
1079 /***********************************************************************
1080  *           LOCAL_Free
1081  *
1082  * Implementation of LocalFree().
1083  */
1084 HLOCAL16 LOCAL_Free( HANDLE16 ds, HLOCAL16 handle )
1085 {
1086     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1087
1088     TRACE("%04x ds=%04x\n", handle, ds );
1089
1090     if (!handle) { WARN("Handle is 0.\n" ); return 0; }
1091     if (HANDLE_FIXED( handle ))
1092     {
1093         if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0;  /* OK */
1094         else return handle;  /* couldn't free it */
1095     }
1096     else
1097     {
1098         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1099         if (pEntry->flags != (LMEM_DISCARDED >> 8))
1100         {
1101             TRACE("real block at %04x\n",
1102                            pEntry->addr );
1103             if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr) ))
1104                 return handle; /* couldn't free it */
1105         }
1106         LOCAL_FreeHandleEntry( ds, handle );
1107         return 0;  /* OK */
1108     }
1109 }
1110
1111
1112 /***********************************************************************
1113  *           LOCAL_Alloc
1114  *
1115  * Implementation of LocalAlloc().
1116  *
1117  */
1118 HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD flags, WORD size )
1119 {
1120     char *ptr;
1121     HLOCAL16 handle;
1122
1123     TRACE("%04x %d ds=%04x\n", flags, size, ds );
1124
1125     if(size > 0 && size <= 4) size = 5;
1126     if (flags & LMEM_MOVEABLE)
1127     {
1128         LOCALHANDLEENTRY *plhe;
1129         HLOCAL16 hmem;
1130
1131         if(size)
1132         {
1133             if (!(hmem = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags )))
1134                 return 0;
1135         }
1136         else /* We just need to allocate a discarded handle */
1137             hmem = 0;
1138         if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1139         {
1140             WARN("Couldn't get handle.\n");
1141             if(hmem)
1142                 LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1143             return 0;
1144         }
1145         ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1146         plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1147         plhe->lock = 0;
1148         if(hmem)
1149         {
1150             plhe->addr = hmem + sizeof(HLOCAL16);
1151             plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
1152             *(HLOCAL16 *)(ptr + hmem) = handle;
1153         }
1154         else
1155         {
1156             plhe->addr = 0;
1157             plhe->flags = LMEM_DISCARDED >> 8;
1158         }
1159     }
1160     else /* FIXED */
1161     {
1162         if(!size)
1163             return 0;
1164         handle = LOCAL_GetBlock( ds, size, flags );
1165     }
1166     return handle;
1167 }
1168
1169
1170 /***********************************************************************
1171  *           LOCAL_ReAlloc
1172  *
1173  * Implementation of LocalReAlloc().
1174  */
1175 HLOCAL16 LOCAL_ReAlloc( HANDLE16 ds, HLOCAL16 handle, WORD size, WORD flags )
1176 {
1177     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1178     LOCALHEAPINFO *pInfo;
1179     LOCALARENA *pArena, *pNext;
1180     LOCALHANDLEENTRY *pEntry = NULL;
1181     WORD arena, oldsize;
1182     HLOCAL16 hmem, blockhandle;
1183     LONG nextarena;
1184
1185     if (!handle) return 0;
1186     if(HANDLE_MOVEABLE(handle) &&
1187      ((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
1188         return 0;
1189
1190     TRACE("%04x %d %04x ds=%04x\n",
1191                    handle, size, flags, ds );
1192     if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1193
1194     if (HANDLE_FIXED( handle ))
1195         blockhandle = handle;
1196     else
1197     {
1198         pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1199         if(pEntry->flags == (LMEM_DISCARDED >> 8))
1200         {
1201             HLOCAL16 hl;
1202             if(pEntry->addr)
1203                 WARN("Dicarded block has non-zero addr.\n");
1204             TRACE("ReAllocating discarded block\n");
1205             if(size <= 4) size = 5;
1206             if (!(hl = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags)))
1207                 return 0;
1208             ptr = MapSL( MAKESEGPTR( ds, 0 ) );  /* Reload ptr */
1209             pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1210             pEntry->addr = hl + sizeof(HLOCAL16);
1211             pEntry->flags = 0;
1212             pEntry->lock = 0;
1213             *(HLOCAL16 *)(ptr + hl) = handle;
1214             return handle;
1215         }
1216         if (((blockhandle = pEntry->addr) & 3) != 2)
1217         {
1218             ERR("(%04x,%04x): invalid handle\n",
1219                      ds, handle );
1220             return 0;
1221         }
1222         if(*((HLOCAL16 *)(ptr + blockhandle) - 1) != handle) {
1223             ERR("Back ptr to handle is invalid\n");
1224             return 0;
1225         }
1226     }
1227
1228     if (flags & LMEM_MODIFY)
1229     {
1230         if (HANDLE_MOVEABLE(handle))
1231         {
1232             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1233             pEntry->flags = (flags & 0x0f00) >> 8;
1234             TRACE("Changing flags to %x.\n", pEntry->flags);
1235         }
1236         return handle;
1237     }
1238
1239     if (!size)
1240     {
1241         if (flags & LMEM_MOVEABLE)
1242         {
1243             if (HANDLE_FIXED(handle))
1244             {
1245                 TRACE("Freeing fixed block.\n");
1246                 return LOCAL_Free( ds, handle );
1247             }
1248             else /* Moveable block */
1249             {
1250                 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1251                 if (pEntry->lock == 0)
1252                 {
1253                     /* discards moveable blocks */
1254                     TRACE("Discarding block\n");
1255                     LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
1256                     pEntry->addr = 0;
1257                     pEntry->flags = (LMEM_DISCARDED >> 8);
1258                     return handle;
1259                 }
1260             }
1261             return 0;
1262         }
1263         else if(flags == 0)
1264         {
1265             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1266             if (pEntry->lock == 0)
1267             {
1268                 /* Frees block */
1269                 return LOCAL_Free( ds, handle );
1270             }
1271         }
1272         return 0;
1273     }
1274
1275     arena = ARENA_HEADER( blockhandle );
1276     TRACE("arena is %04x\n", arena );
1277     pArena = ARENA_PTR( ptr, arena );
1278
1279     if(size <= 4) size = 5;
1280     oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1281     nextarena = LALIGN(blockhandle + size);
1282
1283       /* Check for size reduction */
1284
1285     if (nextarena <= pArena->next)
1286     {
1287         TRACE("size reduction, making new free block\n");
1288         LOCAL_ShrinkArena(ds, arena, nextarena - arena);
1289         TRACE("returning %04x\n", handle );
1290         return handle;
1291     }
1292
1293       /* Check if the next block is free and large enough */
1294
1295     pNext = ARENA_PTR( ptr, pArena->next );
1296     if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1297         (nextarena <= pNext->next))
1298     {
1299         TRACE("size increase, making new free block\n");
1300         LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
1301         TRACE("returning %04x\n", handle );
1302         return handle;
1303     }
1304
1305     /* Now we have to allocate a new block, but not if (fixed block or locked
1306        block) and no LMEM_MOVEABLE */
1307
1308     if (!(flags & LMEM_MOVEABLE))
1309     {
1310         if (HANDLE_FIXED(handle))
1311         {
1312             ERR("Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1313             return 0;
1314         }
1315         else
1316         {
1317             if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
1318             {
1319                 ERR("Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
1320                 return 0;
1321             }
1322         }
1323     }
1324     if(HANDLE_MOVEABLE(handle)) size += sizeof(HLOCAL16);
1325     hmem = LOCAL_GetBlock( ds, size, flags );
1326     ptr = MapSL( MAKESEGPTR( ds, 0 ));  /* Reload ptr                             */
1327     if(HANDLE_MOVEABLE(handle))         /* LOCAL_GetBlock might have triggered    */
1328     {                                   /* a compaction, which might in turn have */
1329       blockhandle = pEntry->addr ;      /* moved the very block we are resizing   */
1330       arena = ARENA_HEADER( blockhandle );   /* thus, we reload arena, too        */
1331     }
1332     if (!hmem)
1333     {
1334         /* Remove the block from the heap and try again */
1335         LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
1336         if (!buffer) return 0;
1337         memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
1338         LOCAL_FreeArena( ds, arena );
1339         if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
1340         {
1341             if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
1342             {
1343                 ERR("Can't restore saved block\n" );
1344                 HeapFree( GetProcessHeap(), 0, buffer );
1345                 return 0;
1346             }
1347             size = oldsize;
1348         }
1349         ptr = MapSL( MAKESEGPTR( ds, 0 ) );  /* Reload ptr */
1350         memcpy( ptr + hmem, buffer, oldsize );
1351         HeapFree( GetProcessHeap(), 0, buffer );
1352     }
1353     else
1354     {
1355         memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1356         LOCAL_FreeArena( ds, arena );
1357     }
1358     if (HANDLE_MOVEABLE( handle ))
1359     {
1360         TRACE("fixing handle\n");
1361         pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1362         pEntry->addr = hmem + sizeof(HLOCAL16);
1363         /* Back ptr should still be correct */
1364         if(*(HLOCAL16 *)(ptr + hmem) != handle)
1365             ERR("back ptr is invalid.\n");
1366         hmem = handle;
1367     }
1368     if (size == oldsize) hmem = 0;  /* Realloc failed */
1369     TRACE("returning %04x\n", hmem );
1370     return hmem;
1371 }
1372
1373
1374 /***********************************************************************
1375  *           LOCAL_InternalLock
1376  */
1377 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1378 {
1379     HLOCAL16 old_handle = handle;
1380
1381     if (HANDLE_MOVEABLE(handle))
1382     {
1383         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1384         if (pEntry->flags == LMEM_DISCARDED) return 0;
1385         if (pEntry->lock < 0xfe) pEntry->lock++;
1386         handle = pEntry->addr;
1387     }
1388     TRACE("%04x returning %04x\n",
1389                    old_handle, handle );
1390     return handle;
1391 }
1392
1393
1394 /***********************************************************************
1395  *           LOCAL_Lock
1396  */
1397 void *LOCAL_Lock( HANDLE16 ds, HLOCAL16 handle )
1398 {
1399     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1400     return handle ? ptr + LOCAL_InternalLock( ptr, handle ) : NULL;
1401 }
1402
1403
1404 /***********************************************************************
1405  *           LOCAL_Unlock
1406  */
1407 BOOL16 LOCAL_Unlock( HANDLE16 ds, HLOCAL16 handle )
1408 {
1409     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1410
1411     TRACE("%04x\n", handle );
1412     if (HANDLE_MOVEABLE(handle))
1413     {
1414         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1415         if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1416         /* For moveable block, return the new lock count */
1417         /* (see _Windows_Internals_ p. 197) */
1418         return --pEntry->lock;
1419     }
1420     else return FALSE;
1421 }
1422
1423
1424 /***********************************************************************
1425  *           LOCAL_Size
1426  *
1427  * Implementation of LocalSize().
1428  */
1429 WORD LOCAL_Size( HANDLE16 ds, HLOCAL16 handle )
1430 {
1431     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1432     LOCALARENA *pArena;
1433
1434     TRACE("%04x ds=%04x\n", handle, ds );
1435
1436     if (HANDLE_MOVEABLE( handle )) handle = *(WORD *)(ptr + handle);
1437     if (!handle) return 0;
1438     pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1439     return pArena->next - handle;
1440 }
1441
1442
1443 /***********************************************************************
1444  *           LOCAL_Flags
1445  *
1446  * Implementation of LocalFlags().
1447  */
1448 WORD LOCAL_Flags( HANDLE16 ds, HLOCAL16 handle )
1449 {
1450     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1451
1452     if (HANDLE_MOVEABLE(handle))
1453     {
1454         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1455         TRACE("(%04x,%04x): returning %04x\n",
1456                        ds, handle, pEntry->lock | (pEntry->flags << 8) );
1457         return pEntry->lock | (pEntry->flags << 8);
1458     }
1459     else
1460     {
1461         TRACE("(%04x,%04x): returning 0\n",
1462                        ds, handle );
1463         return 0;
1464     }
1465 }
1466
1467
1468 /***********************************************************************
1469  *           LOCAL_HeapSize
1470  *
1471  * Implementation of LocalHeapSize().
1472  */
1473 WORD LOCAL_HeapSize( HANDLE16 ds )
1474 {
1475     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1476     if (!pInfo) return 0;
1477     return pInfo->last - pInfo->first;
1478 }
1479
1480
1481 /***********************************************************************
1482  *           LOCAL_CountFree
1483  *
1484  * Implementation of LocalCountFree().
1485  */
1486 WORD LOCAL_CountFree( HANDLE16 ds )
1487 {
1488     WORD arena, total;
1489     LOCALARENA *pArena;
1490     LOCALHEAPINFO *pInfo;
1491     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1492
1493     if (!(pInfo = LOCAL_GetHeap( ds )))
1494     {
1495         ERR("(%04x): Local heap not found\n", ds );
1496         LOCAL_PrintHeap( ds );
1497         return 0;
1498     }
1499
1500     total = 0;
1501     arena = pInfo->first;
1502     pArena = ARENA_PTR( ptr, arena );
1503     for (;;)
1504     {
1505         arena = pArena->free_next;
1506         pArena = ARENA_PTR( ptr, arena );
1507         if (arena == pArena->free_next) break;
1508         total += pArena->size;
1509     }
1510     TRACE("(%04x): returning %d\n", ds, total);
1511     return total;
1512 }
1513
1514
1515 /***********************************************************************
1516  *           LOCAL_Handle
1517  *
1518  * Implementation of LocalHandle().
1519  */
1520 HLOCAL16 LOCAL_Handle( HANDLE16 ds, WORD addr )
1521 {
1522     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1523     LOCALHEAPINFO *pInfo;
1524     WORD table;
1525
1526     if (!(pInfo = LOCAL_GetHeap( ds )))
1527     {
1528         ERR("(%04x): Local heap not found\n", ds );
1529         LOCAL_PrintHeap( ds );
1530         return 0;
1531     }
1532
1533     /* Find the address in the entry tables */
1534
1535     table = pInfo->htable;
1536     while (table)
1537     {
1538         WORD count = *(WORD *)(ptr + table);
1539         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1540         for (; count > 0; count--, pEntry++)
1541             if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1542         table = *(WORD *)pEntry;
1543     }
1544
1545     return (HLOCAL16)addr;  /* Fixed block handle is addr */
1546 }
1547
1548
1549 /***********************************************************************
1550  *           LocalAlloc16   (KERNEL.5)
1551  */
1552 HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
1553 {
1554     HLOCAL16 ret = LOCAL_Alloc( CURRENT_DS, flags, size );
1555     CURRENT_STACK16->ecx = ret;  /* must be returned in cx too */
1556     return ret;
1557 }
1558
1559
1560 /***********************************************************************
1561  *           LocalReAlloc16   (KERNEL.6)
1562  */
1563 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1564 {
1565     return LOCAL_ReAlloc( CURRENT_DS, handle, size, flags );
1566 }
1567
1568
1569 /***********************************************************************
1570  *           LocalFree16   (KERNEL.7)
1571  */
1572 HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
1573 {
1574     return LOCAL_Free( CURRENT_DS, handle );
1575 }
1576
1577
1578 /***********************************************************************
1579  *           LocalLock16   (KERNEL.8)
1580  *
1581  * Note: only the offset part of the pointer is returned by the relay code.
1582  */
1583 SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
1584 {
1585     WORD ds = CURRENT_DS;
1586     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1587     return MAKESEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1588 }
1589
1590
1591 /***********************************************************************
1592  *           LocalUnlock16   (KERNEL.9)
1593  */
1594 BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
1595 {
1596     return LOCAL_Unlock( CURRENT_DS, handle );
1597 }
1598
1599
1600 /***********************************************************************
1601  *           LocalSize16   (KERNEL.10)
1602  */
1603 UINT16 WINAPI LocalSize16( HLOCAL16 handle )
1604 {
1605     return LOCAL_Size( CURRENT_DS, handle );
1606 }
1607
1608
1609 /***********************************************************************
1610  *           LocalHandle16   (KERNEL.11)
1611  */
1612 HLOCAL16 WINAPI LocalHandle16( WORD addr )
1613 {
1614     return LOCAL_Handle( CURRENT_DS, addr );
1615 }
1616
1617
1618 /***********************************************************************
1619  *           LocalFlags16   (KERNEL.12)
1620  */
1621 UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
1622 {
1623     return LOCAL_Flags( CURRENT_DS, handle );
1624 }
1625
1626
1627 /***********************************************************************
1628  *           LocalCompact16   (KERNEL.13)
1629  */
1630 UINT16 WINAPI LocalCompact16( UINT16 minfree )
1631 {
1632     TRACE("%04x\n", minfree );
1633     return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1634 }
1635
1636
1637 /***********************************************************************
1638  *           LocalNotify   (KERNEL.14)
1639  *
1640  * Installs a callback function that is called for local memory events
1641  * Callback function prototype is
1642  * BOOL16 NotifyFunc(WORD wMsg, HLOCAL16 hMem, WORD wArg)
1643  * wMsg:
1644  * - LN_OUTOFMEM
1645  *   NotifyFunc seems to be responsible for allocating some memory,
1646  *   returns TRUE for success.
1647  *   wArg = number of bytes needed additionally
1648  * - LN_MOVE
1649  *   hMem = handle; wArg = old mem location
1650  * - LN_DISCARD
1651  *   NotifyFunc seems to be strongly encouraged to return TRUE,
1652  *   otherwise LogError() gets called.
1653  *   hMem = handle; wArg = flags
1654  */
1655 FARPROC16 WINAPI LocalNotify16( FARPROC16 func )
1656 {
1657     LOCALHEAPINFO *pInfo;
1658     FARPROC16 oldNotify;
1659     HANDLE16 ds = CURRENT_DS;
1660
1661     if (!(pInfo = LOCAL_GetHeap( ds )))
1662     {
1663         ERR("(%04x): Local heap not found\n", ds );
1664         LOCAL_PrintHeap( ds );
1665         return 0;
1666     }
1667     TRACE("(%04x): %08lx\n", ds, (DWORD)func );
1668     FIXME("Half implemented\n");
1669     oldNotify = pInfo->notify;
1670     pInfo->notify = func;
1671     return oldNotify;
1672 }
1673
1674
1675 /***********************************************************************
1676  *           LocalShrink16   (KERNEL.121)
1677  */
1678 UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1679 {
1680     TRACE("%04x %04x\n", handle, newsize );
1681     return 0;
1682 }
1683
1684
1685 /***********************************************************************
1686  *           GetHeapSpaces   (KERNEL.138)
1687  */
1688 DWORD WINAPI GetHeapSpaces16( HMODULE16 module )
1689 {
1690     NE_MODULE *pModule;
1691     WORD ds;
1692
1693     if (!(pModule = NE_GetPtr( module ))) return 0;
1694     ds =
1695     GlobalHandleToSel16((NE_SEG_TABLE( pModule ) + pModule->dgroup - 1)->hSeg);
1696     return MAKELONG( LOCAL_CountFree( ds ), LOCAL_HeapSize( ds ) );
1697 }
1698
1699
1700 /***********************************************************************
1701  *           LocalCountFree   (KERNEL.161)
1702  */
1703 WORD WINAPI LocalCountFree16(void)
1704 {
1705     return LOCAL_CountFree( CURRENT_DS );
1706 }
1707
1708
1709 /***********************************************************************
1710  *           LocalHeapSize   (KERNEL.162)
1711  */
1712 WORD WINAPI LocalHeapSize16(void)
1713 {
1714     TRACE("(void)\n" );
1715     return LOCAL_HeapSize( CURRENT_DS );
1716 }
1717
1718
1719 /***********************************************************************
1720  *           LocalHandleDelta   (KERNEL.310)
1721  */
1722 WORD WINAPI LocalHandleDelta16( WORD delta )
1723 {
1724     LOCALHEAPINFO *pInfo;
1725
1726     if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1727     {
1728         ERR("Local heap not found\n");
1729         LOCAL_PrintHeap( CURRENT_DS );
1730         return 0;
1731     }
1732     if (delta) pInfo->hdelta = delta;
1733     TRACE("returning %04x\n", pInfo->hdelta);
1734     return pInfo->hdelta;
1735 }
1736
1737
1738 /***********************************************************************
1739  *           LocalInfo   (TOOLHELP.56)
1740  */
1741 BOOL16 WINAPI LocalInfo16( LOCALINFO *pLocalInfo, HGLOBAL16 handle )
1742 {
1743     LOCALHEAPINFO *pInfo = LOCAL_GetHeap(SELECTOROF(K32WOWGlobalLock16(handle)));
1744     if (!pInfo) return FALSE;
1745     pLocalInfo->wcItems = pInfo->items;
1746     return TRUE;
1747 }
1748
1749
1750 /***********************************************************************
1751  *           LocalFirst   (TOOLHELP.57)
1752  */
1753 BOOL16 WINAPI LocalFirst16( LOCALENTRY *pLocalEntry, HGLOBAL16 handle )
1754 {
1755     WORD ds = GlobalHandleToSel16( handle );
1756     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1757     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1758     if (!pInfo) return FALSE;
1759
1760     pLocalEntry->hHandle   = pInfo->first + ARENA_HEADER_SIZE;
1761     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1762     pLocalEntry->wFlags    = LF_FIXED;
1763     pLocalEntry->wcLock    = 0;
1764     pLocalEntry->wType     = LT_NORMAL;
1765     pLocalEntry->hHeap     = handle;
1766     pLocalEntry->wHeapType = NORMAL_HEAP;
1767     pLocalEntry->wNext     = ARENA_PTR(ptr,pInfo->first)->next;
1768     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1769     return TRUE;
1770 }
1771
1772
1773 /***********************************************************************
1774  *           LocalNext   (TOOLHELP.58)
1775  */
1776 BOOL16 WINAPI LocalNext16( LOCALENTRY *pLocalEntry )
1777 {
1778     WORD ds = GlobalHandleToSel16( pLocalEntry->hHeap );
1779     char *ptr = MapSL( MAKESEGPTR( ds, 0 ) );
1780     LOCALARENA *pArena;
1781
1782     if (!LOCAL_GetHeap( ds )) return FALSE;
1783     if (!pLocalEntry->wNext) return FALSE;
1784     pArena = ARENA_PTR( ptr, pLocalEntry->wNext );
1785
1786     pLocalEntry->hHandle   = pLocalEntry->wNext + ARENA_HEADER_SIZE;
1787     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1788     pLocalEntry->wFlags    = (pArena->prev & 3) + 1;
1789     pLocalEntry->wcLock    = 0;
1790     pLocalEntry->wType     = LT_NORMAL;
1791     if (pArena->next != pLocalEntry->wNext)  /* last one? */
1792         pLocalEntry->wNext = pArena->next;
1793     else
1794         pLocalEntry->wNext = 0;
1795     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1796     return TRUE;
1797 }
1798
1799
1800 /***********************************************************************
1801  *           LocalAlloc   (KERNEL32.371)
1802  * RETURNS
1803  *      Handle: Success
1804  *      NULL: Failure
1805  */
1806 HLOCAL WINAPI LocalAlloc(
1807                 UINT flags, /* [in] Allocation attributes */
1808                 DWORD size    /* [in] Number of bytes to allocate */
1809 ) {
1810     return (HLOCAL)GlobalAlloc( flags, size );
1811 }
1812
1813
1814 /***********************************************************************
1815  *           LocalCompact   (KERNEL32.372)
1816  */
1817 UINT WINAPI LocalCompact( UINT minfree )
1818 {
1819     return 0;  /* LocalCompact does nothing in Win32 */
1820 }
1821
1822
1823 /***********************************************************************
1824  *           LocalFlags   (KERNEL32.374)
1825  * RETURNS
1826  *      Value specifying allocation flags and lock count.
1827  *      LMEM_INVALID_HANDLE: Failure
1828  */
1829 UINT WINAPI LocalFlags(
1830               HLOCAL handle /* [in] Handle of memory object */
1831 ) {
1832     return GlobalFlags( (HGLOBAL)handle );
1833 }
1834
1835
1836 /***********************************************************************
1837  *           LocalFree   (KERNEL32.375)
1838  * RETURNS
1839  *      NULL: Success
1840  *      Handle: Failure
1841  */
1842 HLOCAL WINAPI LocalFree(
1843                 HLOCAL handle /* [in] Handle of memory object */
1844 ) {
1845     return (HLOCAL)GlobalFree( (HGLOBAL)handle );
1846 }
1847
1848
1849 /***********************************************************************
1850  *           LocalHandle   (KERNEL32.376)
1851  * RETURNS
1852  *      Handle: Success
1853  *      NULL: Failure
1854  */
1855 HLOCAL WINAPI LocalHandle(
1856                 LPCVOID ptr /* [in] Address of local memory object */
1857 ) {
1858     return (HLOCAL)GlobalHandle( ptr );
1859 }
1860
1861
1862 /***********************************************************************
1863  *           LocalLock   (KERNEL32.377)
1864  * Locks a local memory object and returns pointer to the first byte
1865  * of the memory block.
1866  *
1867  * RETURNS
1868  *      Pointer: Success
1869  *      NULL: Failure
1870  */
1871 LPVOID WINAPI LocalLock(
1872               HLOCAL handle /* [in] Address of local memory object */
1873 ) {
1874     return GlobalLock( (HGLOBAL)handle );
1875 }
1876
1877
1878 /***********************************************************************
1879  *           LocalReAlloc   (KERNEL32.378)
1880  * RETURNS
1881  *      Handle: Success
1882  *      NULL: Failure
1883  */
1884 HLOCAL WINAPI LocalReAlloc(
1885                 HLOCAL handle, /* [in] Handle of memory object */
1886                 DWORD size,      /* [in] New size of block */
1887                 UINT flags     /* [in] How to reallocate object */
1888 ) {
1889     return (HLOCAL)GlobalReAlloc( (HGLOBAL)handle, size, flags );
1890 }
1891
1892
1893 /***********************************************************************
1894  *           LocalShrink   (KERNEL32.379)
1895  */
1896 UINT WINAPI LocalShrink( HGLOBAL handle, UINT newsize )
1897 {
1898     return 0;  /* LocalShrink does nothing in Win32 */
1899 }
1900
1901
1902 /***********************************************************************
1903  *           LocalSize   (KERNEL32.380)
1904  * RETURNS
1905  *      Size: Success
1906  *      0: Failure
1907  */
1908 UINT WINAPI LocalSize(
1909               HLOCAL handle /* [in] Handle of memory object */
1910 ) {
1911     return GlobalSize( (HGLOBAL)handle );
1912 }
1913
1914
1915 /***********************************************************************
1916  *           LocalUnlock   (KERNEL32.381)
1917  * RETURNS
1918  *      TRUE: Object is still locked
1919  *      FALSE: Object is unlocked
1920  */
1921 BOOL WINAPI LocalUnlock(
1922               HLOCAL handle /* [in] Handle of memory object */
1923 ) {
1924     return GlobalUnlock( (HGLOBAL)handle );
1925 }