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 DECLARE_DEBUG_CHANNEL(heap)
  31 DECLARE_DEBUG_CHANNEL(local)
  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_(local)("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         return NULL;
 140     pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
 141     if (pInfo->magic != LOCAL_HEAP_MAGIC) return NULL;
 142     return pInfo;
 143 }
 144
 145
 146 /***********************************************************************
 147  *           LOCAL_MakeBlockFree
 148  *
 149  * Make a block free, inserting it in the free-list.
 150  * 'block' is the handle of the block arena; 'baseptr' points to
 151  * the beginning of the data segment containing the heap.
 152  */
 153 static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
 154 {
 155     LOCALARENA *pArena, *pNext;
 156     WORD next;
 157
 158       /* Mark the block as free */
 159
 160     pArena = ARENA_PTR( baseptr, block );
 161     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
 162     pArena->size = pArena->next - block;
 163
 164       /* Find the next free block (last block is always free) */
 165
 166     next = pArena->next;
 167     for (;;)
 168     {
 169         pNext = ARENA_PTR( baseptr, next );
 170         if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
 171         next = pNext->next;
 172     }
 173
 174     TRACE_(local)("Local_MakeBlockFree %04x, next %04x\n", block, next );
 175       /* Insert the free block in the free-list */
 176
 177     pArena->free_prev = pNext->free_prev;
 178     pArena->free_next = next;
 179     ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
 180     pNext->free_prev  = block;
 181 }
 182
 183
 184 /***********************************************************************
 185  *           LOCAL_RemoveFreeBlock
 186  *
 187  * Remove a block from the free-list.
 188  * 'block' is the handle of the block arena; 'baseptr' points to
 189  * the beginning of the data segment containing the heap.
 190  */
 191 static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
 192 {
 193       /* Mark the block as fixed */
 194
 195     LOCALARENA *pArena = ARENA_PTR( baseptr, block );
 196     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
 197
 198       /* Remove it from the list */
 199
 200     ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
 201     ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
 202 }
 203
 204
 205 /***********************************************************************
 206  *           LOCAL_AddBlock
 207  *
 208  * Insert a new block in the heap.
 209  * 'new' is the handle of the new block arena; 'baseptr' points to
 210  * the beginning of the data segment containing the heap; 'prev' is
 211  * the block before the new one.
 212  */
 213 static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
 214 {
 215     LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
 216     LOCALARENA *pNew  = ARENA_PTR( baseptr, new );
 217
 218     pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
 219     pNew->next = pPrev->next;
 220     ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
 221     ARENA_PTR(baseptr,pPrev->next)->prev |= new;
 222     pPrev->next = new;
 223 }
 224
 225
 226 /***********************************************************************
 227  *           LOCAL_RemoveBlock
 228  *
 229  * Remove a block from the heap.
 230  * 'block' is the handle of the block arena; 'baseptr' points to
 231  * the beginning of the data segment containing the heap.
 232  */
 233 static void LOCAL_RemoveBlock( char *baseptr, WORD block )
 234 {
 235     LOCALARENA *pArena, *pTmp;
 236
 237       /* Remove the block from the free-list */
 238
 239     TRACE_(local)("Local_RemoveBlock\n");
 240     pArena = ARENA_PTR( baseptr, block );
 241     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 242         LOCAL_RemoveFreeBlock( baseptr, block );
 243
 244       /* If the previous block is free, expand its size */
 245
 246     pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
 247     if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
 248         pTmp->size += pArena->next - block;
 249
 250       /* Remove the block from the linked list */
 251
 252     pTmp->next = pArena->next;
 253     pTmp = ARENA_PTR( baseptr, pArena->next );
 254     pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
 255 }
 256
 257
 258 /***********************************************************************
 259  *           LOCAL_PrintHeap
 260  */
 261 static void LOCAL_PrintHeap( HANDLE16 ds )
 262 {
 263     char *ptr;
 264     LOCALHEAPINFO *pInfo;
 265     WORD arena;
 266
 267     /* FIXME - the test should be done when calling the function!
 268                plus is not clear that we should print this info
 269                only when TRACE_ON is on! */
 270     if(!TRACE_ON(local)) return;
 271
 272     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 273     pInfo = LOCAL_GetHeap( ds );
 274
 275     if (!pInfo)
 276     {
 277         DPRINTF( "Local Heap corrupted!  ds=%04x\n", ds );
 278         return;
 279     }
 280     DPRINTF( "Local Heap  ds=%04x first=%04x last=%04x items=%d\n",
 281              ds, pInfo->first, pInfo->last, pInfo->items );
 282
 283     arena = pInfo->first;
 284     for (;;)
 285     {
 286         LOCALARENA *pArena = ARENA_PTR(ptr,arena);
 287         DPRINTF( "  %04x: prev=%04x next=%04x type=%d\n", arena,
 288               pArena->prev & ~3, pArena->next, pArena->prev & 3 );
 289         if (arena == pInfo->first)
 290         {
 291             DPRINTF( "        size=%d free_prev=%04x free_next=%04x\n",
 292                      pArena->size, pArena->free_prev, pArena->free_next );
 293         }
 294         if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 295         {
 296             DPRINTF( "        size=%d free_prev=%04x free_next=%04x\n",
 297                      pArena->size, pArena->free_prev, pArena->free_next );
 298             if (pArena->next == arena) break;  /* last one */
 299             if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
 300             {
 301                 DPRINTF( "*** arena->free_next->free_prev != arena\n" );
 302                 break;
 303             }
 304         }
 305         if (pArena->next == arena)
 306         {
 307             DPRINTF( "*** last block is not marked free\n" );
 308             break;
 309         }
 310         if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
 311         {
 312             DPRINTF( "*** arena->next->prev != arena (%04x, %04x)\n",
 313                      pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
 314             break;
 315         }
 316         arena = pArena->next;
 317     }
 318 }
 319
 320
 321 /***********************************************************************
 322  *           LocalInit   (KERNEL.4)
 323  */
 324 BOOL16 WINAPI LocalInit16( HANDLE16 selector, WORD start, WORD end )
 325 {
 326     char *ptr;
 327     WORD heapInfoArena, freeArena, lastArena;
 328     LOCALHEAPINFO *pHeapInfo;
 329     LOCALARENA *pArena, *pFirstArena, *pLastArena;
 330     NE_MODULE *pModule;
 331
 332       /* The initial layout of the heap is: */
 333       /* - first arena         (FIXED)      */
 334       /* - heap info structure (FIXED)      */
 335       /* - large free block    (FREE)       */
 336       /* - last arena          (FREE)       */
 337
 338     TRACE_(local)("%04x %04x-%04x\n", selector, start, end);
 339     if (!selector) selector = CURRENT_DS;
 340
 341     if (TRACE_ON(heap))
 342     {
 343         /* If TRACE_ON(heap) is set, the global heap blocks are */
 344         /* cleared before use, so we can test for double initialization. */
 345         if (LOCAL_GetHeap(selector))
 346         {
 347             ERR_(local)("Heap %04x initialized twice.\n", selector);
 348             LOCAL_PrintHeap(selector);
 349         }
 350     }
 351
 352     if (start == 0)
 353     {
 354         /* start == 0 means: put the local heap at the end of the segment */
 355
 356         DWORD size = GlobalSize16( GlobalHandle16( selector ) );
 357         start = (WORD)(size > 0xffff ? 0xffff : size) - 1;
 358         start -= end;
 359         end += start;
 360
 361         /* Paranoid check */
 362
 363         if ((pModule = NE_GetPtr( GlobalHandle16( selector ) )))
 364         {
 365             SEGTABLEENTRY *pSeg = NE_SEG_TABLE( pModule );
 366             int segNr;
 367
 368             for ( segNr = 0; segNr < pModule->seg_count; segNr++, pSeg++ )
 369                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 370                     break;
 371
 372             if ( segNr < pModule->seg_count )
 373             {
 374                 WORD minsize = pSeg->minsize;
 375                 if ( pModule->ss == segNr+1 )
 376                     minsize += pModule->stack_size;
 377
 378                 TRACE_(local)(" new start %04x, minstart: %04x\n", start, minsize);
 379             }
 380         }
 381     }
 382     ptr = PTR_SEG_OFF_TO_LIN( selector, 0 );
 383
 384     start = LALIGN( MAX( start, sizeof(INSTANCEDATA) ) );
 385     heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
 386     freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
 387                         + sizeof(LOCALHEAPINFO) );
 388     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 389
 390       /* Make sure there's enough space.       */
 391
 392     if (freeArena + sizeof(LOCALARENA) >= lastArena) return FALSE;
 393
 394       /* Initialise the first arena */
 395
 396     pFirstArena = ARENA_PTR( ptr, start );
 397     pFirstArena->prev      = start | LOCAL_ARENA_FIXED;
 398     pFirstArena->next      = heapInfoArena;
 399     pFirstArena->size      = LALIGN(sizeof(LOCALARENA));
 400     pFirstArena->free_prev = start;  /* this one */
 401     pFirstArena->free_next = freeArena;
 402
 403       /* Initialise the arena of the heap info structure */
 404
 405     pArena = ARENA_PTR( ptr, heapInfoArena );
 406     pArena->prev = start | LOCAL_ARENA_FIXED;
 407     pArena->next = freeArena;
 408
 409       /* Initialise the heap info structure */
 410
 411     pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
 412     memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
 413     pHeapInfo->items   = 4;
 414     pHeapInfo->first   = start;
 415     pHeapInfo->last    = lastArena;
 416     pHeapInfo->htable  = 0;
 417     pHeapInfo->hdelta  = 0x20;
 418     pHeapInfo->extra   = 0x200;
 419     pHeapInfo->minsize = lastArena - freeArena;
 420     pHeapInfo->magic   = LOCAL_HEAP_MAGIC;
 421
 422       /* Initialise the large free block */
 423
 424     pArena = ARENA_PTR( ptr, freeArena );
 425     pArena->prev      = heapInfoArena | LOCAL_ARENA_FREE;
 426     pArena->next      = lastArena;
 427     pArena->size      = lastArena - freeArena;
 428     pArena->free_prev = start;
 429     pArena->free_next = lastArena;
 430
 431       /* Initialise the last block */
 432
 433     pLastArena = ARENA_PTR( ptr, lastArena );
 434     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 435     pLastArena->next      = lastArena;  /* this one */
 436     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 437     pLastArena->free_prev = freeArena;
 438     pLastArena->free_next = lastArena;  /* this one */
 439
 440       /* Store the local heap address in the instance data */
 441
 442     ((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
 443     LOCAL_PrintHeap( selector );
 444     return TRUE;
 445 }
 446
 447 /***********************************************************************
 448  *           LOCAL_GrowHeap
 449  */
 450 static BOOL16 LOCAL_GrowHeap( HANDLE16 ds )
 451 {
 452     HANDLE16 hseg;
 453     LONG oldsize;
 454     LONG end;
 455     LOCALHEAPINFO *pHeapInfo;
 456     WORD freeArena, lastArena;
 457     LOCALARENA *pArena, *pLastArena;
 458     char *ptr;
 459
 460     hseg = GlobalHandle16( ds );
 461     /* maybe mem allocated by Virtual*() ? */
 462     if (!hseg) return FALSE;
 463
 464     oldsize = GlobalSize16( hseg );
 465     /* if nothing can be gained, return */
 466     if (oldsize > 0xfff0) return FALSE;
 467     hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
 468     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 469     pHeapInfo = LOCAL_GetHeap( ds );
 470     if (pHeapInfo == NULL) {
 471         ERR_(local)("Heap not found\n" );
 472         return FALSE;
 473     }
 474     end = GlobalSize16( hseg );
 475     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 476
 477       /* Update the HeapInfo */
 478     pHeapInfo->items++;
 479     freeArena = pHeapInfo->last;
 480     pHeapInfo->last = lastArena;
 481     pHeapInfo->minsize += end - oldsize;
 482
 483       /* grow the old last block */
 484     pArena = ARENA_PTR( ptr, freeArena );
 485     pArena->size      = lastArena - freeArena;
 486     pArena->next      = lastArena;
 487     pArena->free_next = lastArena;
 488
 489       /* Initialise the new last block */
 490
 491     pLastArena = ARENA_PTR( ptr, lastArena );
 492     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 493     pLastArena->next      = lastArena;  /* this one */
 494     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 495     pLastArena->free_prev = freeArena;
 496     pLastArena->free_next = lastArena;  /* this one */
 497
 498     /* If block before freeArena is also free then merge them */
 499     if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
 500     {
 501         LOCAL_RemoveBlock(ptr, freeArena);
 502         pHeapInfo->items--;
 503     }
 504
 505     TRACE_(local)("Heap expanded\n" );
 506     LOCAL_PrintHeap( ds );
 507     return TRUE;
 508 }
 509
 510
 511 /***********************************************************************
 512  *           LOCAL_FreeArena
 513  */
 514 static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
 515 {
 516     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 517     LOCALHEAPINFO *pInfo;
 518     LOCALARENA *pArena, *pPrev, *pNext;
 519
 520     TRACE_(local)("%04x ds=%04x\n", arena, ds );
 521     if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
 522
 523     pArena = ARENA_PTR( ptr, arena );
 524     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 525     {
 526         /* shouldn't happen */
 527         ERR_(local)("Trying to free block %04x twice!\n",
 528                  arena );
 529         LOCAL_PrintHeap( ds );
 530         return arena;
 531     }
 532
 533       /* Check if we can merge with the previous block */
 534
 535     pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
 536     pNext = ARENA_PTR( ptr, pArena->next );
 537     if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
 538     {
 539         arena  = pArena->prev & ~3;
 540         pArena = pPrev;
 541         LOCAL_RemoveBlock( ptr, pPrev->next );
 542         pInfo->items--;
 543     }
 544     else  /* Make a new free block */
 545     {
 546         LOCAL_MakeBlockFree( ptr, arena );
 547     }
 548
 549       /* Check if we can merge with the next block */
 550
 551     if ((pArena->next == pArena->free_next) &&
 552         (pArena->next != pInfo->last))
 553     {
 554         LOCAL_RemoveBlock( ptr, pArena->next );
 555         pInfo->items--;
 556     }
 557     return 0;
 558 }
 559
 560
 561 /***********************************************************************
 562  *           LOCAL_ShrinkArena
 563  *
 564  * Shrink an arena by creating a free block at its end if possible.
 565  * 'size' includes the arena header, and must be aligned.
 566  */
 567 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
 568 {
 569     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 570     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 571
 572     if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
 573     {
 574         LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
 575         if (!pInfo) return;
 576         LOCAL_AddBlock( ptr, arena, arena + size );
 577         pInfo->items++;
 578         LOCAL_FreeArena( ds, arena + size );
 579     }
 580 }
 581
 582
 583 /***********************************************************************
 584  *           LOCAL_GrowArenaDownward
 585  *
 586  * Grow an arena downward by using the previous arena (must be free).
 587  */
 588 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
 589 {
 590     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 591     LOCALHEAPINFO *pInfo;
 592     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 593     WORD prevArena = pArena->prev & ~3;
 594     LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
 595     WORD offset, size;
 596     char *p;
 597
 598     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 599     offset = pPrevArena->size;
 600     size = pArena->next - arena - ARENA_HEADER_SIZE;
 601     LOCAL_RemoveFreeBlock( ptr, prevArena );
 602     LOCAL_RemoveBlock( ptr, arena );
 603     pInfo->items--;
 604     p = (char *)pPrevArena + ARENA_HEADER_SIZE;
 605     while (offset < size)
 606     {
 607         memcpy( p, p + offset, offset );
 608         p += offset;
 609         size -= offset;
 610     }
 611     if (size) memcpy( p, p + offset, size );
 612     LOCAL_ShrinkArena( ds, prevArena, newsize );
 613 }
 614
 615
 616
 617 /***********************************************************************
 618  *           LOCAL_GrowArenaUpward
 619  *
 620  * Grow an arena upward by using the next arena (must be free and big
 621  * enough). Newsize includes the arena header and must be aligned.
 622  */
 623 static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
 624 {
 625     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 626     LOCALHEAPINFO *pInfo;
 627     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 628     WORD nextArena = pArena->next;
 629
 630     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 631     LOCAL_RemoveBlock( ptr, nextArena );
 632     pInfo->items--;
 633     LOCAL_ShrinkArena( ds, arena, newsize );
 634 }
 635
 636
 637 /***********************************************************************
 638  *           LOCAL_GetFreeSpace
 639  */
 640 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
 641 {
 642     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 643     LOCALHEAPINFO *pInfo;
 644     LOCALARENA *pArena;
 645     WORD arena;
 646     WORD freespace = 0;
 647
 648     if (!(pInfo = LOCAL_GetHeap( ds )))
 649     {
 650         ERR_(local)("Local heap not found\n" );
 651         LOCAL_PrintHeap(ds);
 652         return 0;
 653     }
 654     arena = pInfo->first;
 655     pArena = ARENA_PTR( ptr, arena );
 656     while (arena != pArena->free_next)
 657     {
 658         arena = pArena->free_next;
 659         pArena = ARENA_PTR( ptr, arena );
 660         if (pArena->size >= freespace) freespace = pArena->size;
 661     }
 662     /* FIXME doesn't yet calculate space that would become free if everything
 663        were discarded when countdiscard == 1 */
 664     if (freespace < ARENA_HEADER_SIZE) freespace = 0;
 665     else freespace -= ARENA_HEADER_SIZE;
 666     return freespace;
 667 }
 668
 669
 670 /***********************************************************************
 671  *           LOCAL_Compact
 672  */
 673 WORD LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
 674 {
 675     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 676     LOCALHEAPINFO *pInfo;
 677     LOCALARENA *pArena, *pMoveArena, *pFinalArena;
 678     WORD arena, movearena, finalarena, table;
 679     WORD count, movesize, size;
 680     WORD freespace;
 681     LOCALHANDLEENTRY *pEntry;
 682
 683     if (!(pInfo = LOCAL_GetHeap( ds )))
 684     {
 685         ERR_(local)("Local heap not found\n" );
 686         LOCAL_PrintHeap(ds);
 687         return 0;
 688     }
 689     TRACE_(local)("ds = %04x, minfree = %04x, flags = %04x\n",
 690                  ds, minfree, flags);
 691     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 692     if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
 693     {
 694         TRACE_(local)("Returning %04x.\n", freespace);
 695         return freespace;
 696     }
 697     TRACE_(local)("Compacting heap %04x.\n", ds);
 698     table = pInfo->htable;
 699     while(table)
 700     {
 701         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 702         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 703         {
 704             if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
 705             {
 706                 /* OK we can move this one if we want */
 707                 TRACE_(local)("handle %04x (block %04x) can be moved.\n",
 708                              (WORD)((char *)pEntry - ptr), pEntry->addr);
 709                 movearena = ARENA_HEADER(pEntry->addr);
 710                 pMoveArena = ARENA_PTR(ptr, movearena);
 711                 movesize = pMoveArena->next - movearena;
 712                 arena = pInfo->first;
 713                 pArena = ARENA_PTR(ptr, arena);
 714                 size = 0xffff;
 715                 finalarena = 0;
 716                 /* Try to find the smallest arena that will do, */
 717                 /* which is below us in memory */
 718                 for(;;)
 719                 {
 720                     arena = pArena->free_next;
 721                     pArena = ARENA_PTR(ptr, arena);
 722                     if(arena >= movearena)
 723                         break;
 724                     if(arena == pArena->free_next)
 725                         break;
 726                     if((pArena->size >= movesize) && (pArena->size < size))
 727                     {
 728                         size = pArena->size;
 729                         finalarena = arena;
 730                     }
 731                 }
 732                 if (finalarena) /* Actually got somewhere to move */
 733                 {
 734                     TRACE_(local)("Moving it to %04x.\n", finalarena);
 735                     pFinalArena = ARENA_PTR(ptr, finalarena);
 736                     size = pFinalArena->size;
 737                     LOCAL_RemoveFreeBlock(ptr, finalarena);
 738                     LOCAL_ShrinkArena( ds, finalarena, movesize );
 739                     /* Copy the arena to it's new location */
 740                     memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
 741                            (char *)pMoveArena + ARENA_HEADER_SIZE,
 742                            movesize - ARENA_HEADER_SIZE );
 743                     /* Free the old location */
 744                     LOCAL_FreeArena(ds, movearena);
 745                     if (pInfo->notify)
 746                         Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_MOVE,
 747                         (WORD)((char *)pEntry - ptr), pEntry->addr);
 748                     /* Update handle table entry */
 749                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 750                 }
 751                 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
 752                                == LOCAL_ARENA_FREE)
 753                 {
 754                     /* Previous arena is free (but < movesize)  */
 755                     /* so we can 'slide' movearena down into it */
 756                     finalarena = pMoveArena->prev & ~3;
 757                     LOCAL_GrowArenaDownward( ds, movearena, movesize );
 758                     /* Update handle table entry */
 759                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 760                 }
 761             }
 762         }
 763         table = *(WORD *)pEntry;
 764     }
 765     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 766     if(freespace >= minfree || (flags & LMEM_NODISCARD))
 767     {
 768         TRACE_(local)("Returning %04x.\n", freespace);
 769         return freespace;
 770     }
 771
 772     table = pInfo->htable;
 773     while(table)
 774     {
 775         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 776         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 777         {
 778             if(pEntry->addr && pEntry->lock == 0 &&
 779              (pEntry->flags & (LMEM_DISCARDABLE >> 8)))
 780             {
 781                 TRACE_(local)("Discarding handle %04x (block %04x).\n",
 782                               (char *)pEntry - ptr, pEntry->addr);
 783                 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
 784                 if (pInfo->notify)
 785                     Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_DISCARD,
 786                         (char *)pEntry - ptr, pEntry->flags);
 787                 pEntry->addr = 0;
 788                 pEntry->flags = (LMEM_DISCARDED >> 8);
 789             }
 790         }
 791         table = *(WORD *)pEntry;
 792     }
 793     return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
 794 }
 795
 796
 797 /***********************************************************************
 798  *           LOCAL_FindFreeBlock
 799  */
 800 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
 801 {
 802     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 803     LOCALHEAPINFO *pInfo;
 804     LOCALARENA *pArena;
 805     WORD arena;
 806
 807     if (!(pInfo = LOCAL_GetHeap( ds )))
 808     {
 809         ERR_(local)("Local heap not found\n" );
 810         LOCAL_PrintHeap(ds);
 811         return 0;
 812     }
 813
 814     arena = pInfo->first;
 815     pArena = ARENA_PTR( ptr, arena );
 816     for (;;) {
 817         arena = pArena->free_next;
 818         pArena = ARENA_PTR( ptr, arena );
 819         if (arena == pArena->free_next) break;
 820         if (pArena->size >= size) return arena;
 821     }
 822     TRACE_(local)("not enough space\n" );
 823     LOCAL_PrintHeap(ds);
 824     return 0;
 825 }
 826
 827 /***********************************************************************
 828  *           LOCAL_GetBlock
 829  * The segment may get moved around in this function, so all callers
 830  * should reset their pointer variables.
 831  */
 832 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
 833 {
 834     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 835     LOCALHEAPINFO *pInfo;
 836     LOCALARENA *pArena;
 837     WORD arena;
 838
 839     if (!(pInfo = LOCAL_GetHeap( ds )))
 840     {
 841         ERR_(local)("Local heap not found\n");
 842         LOCAL_PrintHeap(ds);
 843         return 0;
 844     }
 845
 846     size += ARENA_HEADER_SIZE;
 847     size = LALIGN( MAX( size, sizeof(LOCALARENA) ) );
 848
 849 #if 0
 850 notify_done:
 851 #endif
 852       /* Find a suitable free block */
 853     arena = LOCAL_FindFreeBlock( ds, size );
 854     if (arena == 0) {
 855         /* no space: try to make some */
 856         LOCAL_Compact( ds, size, flags );
 857         arena = LOCAL_FindFreeBlock( ds, size );
 858     }
 859     if (arena == 0) {
 860         /* still no space: try to grow the segment */
 861         if (!(LOCAL_GrowHeap( ds )))
 862         {
 863 #if 0
 864             /* FIXME: doesn't work correctly yet */
 865             if ((pInfo->notify) && (Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_OUTOFMEM, ds - 20, size))) /* FIXME: "size" correct ? (should indicate bytes needed) */
 866                 goto notify_done;
 867 #endif
 868             return 0;
 869         }
 870         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 871         pInfo = LOCAL_GetHeap( ds );
 872         arena = LOCAL_FindFreeBlock( ds, size );
 873     }
 874     if (arena == 0) {
 875         if (ds == GDI_HeapSel) {
 876             ERR_(local)("not enough space in GDI local heap "
 877                          "(%04x) for %d bytes\n", ds, size );
 878         } else if (ds == USER_HeapSel) {
 879             ERR_(local)("not enough space in USER local heap "
 880                          "(%04x) for %d bytes\n", ds, size );
 881         } else {
 882             ERR_(local)("not enough space in local heap "
 883                          "%04x for %d bytes\n", ds, size );
 884         }
 885 #if 0
 886         if ((pInfo->notify) &&
 887         /* FIXME: "size" correct ? (should indicate bytes needed) */
 888         (Callbacks->CallLocalNotifyFunc(pInfo->notify, LN_OUTOFMEM, ds, size)))
 889             goto notify_done;
 890 #endif
 891         return 0;
 892     }
 893
 894       /* Make a block out of the free arena */
 895     pArena = ARENA_PTR( ptr, arena );
 896     TRACE_(local)("LOCAL_GetBlock size = %04x, arena %04x size %04x\n",
 897                   size, arena, pArena->size );
 898     LOCAL_RemoveFreeBlock( ptr, arena );
 899     LOCAL_ShrinkArena( ds, arena, size );
 900
 901     if (flags & LMEM_ZEROINIT)
 902         memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
 903     return arena + ARENA_HEADER_SIZE;
 904 }
 905
 906
 907 /***********************************************************************
 908  *           LOCAL_NewHTable
 909  */
 910 static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
 911 {
 912     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 913     LOCALHEAPINFO *pInfo;
 914     LOCALHANDLEENTRY *pEntry;
 915     HLOCAL16 handle;
 916     int i;
 917
 918     TRACE_(local)("Local_NewHTable\n" );
 919     if (!(pInfo = LOCAL_GetHeap( ds )))
 920     {
 921         ERR_(local)("Local heap not found\n");
 922         LOCAL_PrintHeap(ds);
 923         return FALSE;
 924     }
 925
 926     if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
 927                                    + 2 * sizeof(WORD), LMEM_FIXED )))
 928         return FALSE;
 929     if (!(ptr = PTR_SEG_OFF_TO_LIN( ds, 0 )))
 930         ERR_(local)("ptr == NULL after GetBlock.\n");
 931     if (!(pInfo = LOCAL_GetHeap( ds )))
 932         ERR_(local)("pInfo == NULL after GetBlock.\n");
 933
 934     /* Fill the entry table */
 935
 936     *(WORD *)(ptr + handle) = pInfo->hdelta;
 937     pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
 938     for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
 939         pEntry->lock = pEntry->flags = 0xff;
 940         pEntry->addr = 0;
 941     }
 942     *(WORD *)pEntry = pInfo->htable;
 943     pInfo->htable = handle;
 944     return TRUE;
 945 }
 946
 947
 948 /***********************************************************************
 949  *           LOCAL_GetNewHandleEntry
 950  */
 951 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
 952 {
 953     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 954     LOCALHEAPINFO *pInfo;
 955     LOCALHANDLEENTRY *pEntry = NULL;
 956     WORD table;
 957
 958     if (!(pInfo = LOCAL_GetHeap( ds )))
 959     {
 960         ERR_(local)("Local heap not found\n");
 961         LOCAL_PrintHeap(ds);
 962         return 0;
 963     }
 964
 965     /* Find a free slot in existing tables */
 966
 967     table = pInfo->htable;
 968     while (table)
 969     {
 970         WORD count = *(WORD *)(ptr + table);
 971         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 972         for (; count > 0; count--, pEntry++)
 973             if (pEntry->lock == 0xff) break;
 974         if (count) break;
 975         table = *(WORD *)pEntry;
 976     }
 977
 978     if (!table)  /* We need to create a new table */
 979     {
 980         if (!LOCAL_NewHTable( ds )) return 0;
 981         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 982         pInfo = LOCAL_GetHeap( ds );
 983         pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
 984     }
 985
 986     /* Now allocate this entry */
 987
 988     pEntry->lock = 0;
 989     pEntry->flags = 0;
 990     TRACE_(local)("(%04x): %04x\n",
 991                    ds, ((char *)pEntry - ptr) );
 992     return (HLOCAL16)((char *)pEntry - ptr);
 993 }
 994
 995
 996 /***********************************************************************
 997  *           LOCAL_FreeHandleEntry
 998  *
 999  * Free a handle table entry.
1000  */
1001 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
1002 {
1003     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1004     LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1005     LOCALHEAPINFO *pInfo;
1006     WORD *pTable;
1007     WORD table, count, i;
1008
1009     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
1010
1011     /* Find the table where this handle comes from */
1012
1013     pTable = &pInfo->htable;
1014     while (*pTable)
1015     {
1016         WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
1017         if ((handle >= *pTable + sizeof(WORD)) &&
1018             (handle < *pTable + sizeof(WORD) + size)) break;  /* Found it */
1019         pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
1020     }
1021     if (!*pTable)
1022     {
1023         ERR_(local)("Invalid entry %04x\n", handle);
1024         LOCAL_PrintHeap( ds );
1025         return;
1026     }
1027
1028     /* Make the entry free */
1029
1030     pEntry->addr = 0;  /* just in case */
1031     pEntry->lock = 0xff;
1032     pEntry->flags = 0xff;
1033     /* Now check if all entries in this table are free */
1034
1035     table = *pTable;
1036     pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
1037     count = *(WORD *)(ptr + table);
1038     for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
1039
1040     /* Remove the table from the linked list and free it */
1041
1042     TRACE_(local)("(%04x): freeing table %04x\n",
1043                    ds, table);
1044     *pTable = *(WORD *)pEntry;
1045     LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
1046 }
1047
1048
1049 /***********************************************************************
1050  *           LOCAL_Free
1051  *
1052  * Implementation of LocalFree().
1053  */
1054 HLOCAL16 LOCAL_Free( HANDLE16 ds, HLOCAL16 handle )
1055 {
1056     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1057
1058     TRACE_(local)("%04x ds=%04x\n", handle, ds );
1059
1060     if (!handle) { WARN_(local)("Handle is 0.\n" ); return 0; }
1061     if (HANDLE_FIXED( handle ))
1062     {
1063         if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0;  /* OK */
1064         else return handle;  /* couldn't free it */
1065     }
1066     else
1067     {
1068         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1069         if (pEntry->flags != (LMEM_DISCARDED >> 8))
1070         {
1071             TRACE_(local)("real block at %04x\n",
1072                            pEntry->addr );
1073             if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr) ))
1074                 return handle; /* couldn't free it */
1075         }
1076         LOCAL_FreeHandleEntry( ds, handle );
1077         return 0;  /* OK */
1078     }
1079 }
1080
1081
1082 /***********************************************************************
1083  *           LOCAL_Alloc
1084  *
1085  * Implementation of LocalAlloc().
1086  *
1087  */
1088 HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD flags, WORD size )
1089 {
1090     char *ptr;
1091     HLOCAL16 handle;
1092
1093     TRACE_(local)("%04x %d ds=%04x\n", flags, size, ds );
1094
1095     if(size > 0 && size <= 4) size = 5;
1096     if (flags & LMEM_MOVEABLE)
1097     {
1098         LOCALHANDLEENTRY *plhe;
1099         HLOCAL16 hmem;
1100
1101         if(size)
1102         {
1103             if (!(hmem = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags )))
1104                 return 0;
1105         }
1106         else /* We just need to allocate a discarded handle */
1107             hmem = 0;
1108         if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1109         {
1110             WARN_(local)("Couldn't get handle.\n");
1111             if(hmem)
1112                 LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1113             return 0;
1114         }
1115         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1116         plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1117         plhe->lock = 0;
1118         if(hmem)
1119         {
1120             plhe->addr = hmem + sizeof(HLOCAL16);
1121             plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
1122             *(HLOCAL16 *)(ptr + hmem) = handle;
1123         }
1124         else
1125         {
1126             plhe->addr = 0;
1127             plhe->flags = LMEM_DISCARDED >> 8;
1128         }
1129     }
1130     else /* FIXED */
1131     {
1132         if(!size)
1133             return 0;
1134         handle = LOCAL_GetBlock( ds, size, flags );
1135     }
1136     return handle;
1137 }
1138
1139
1140 /***********************************************************************
1141  *           LOCAL_ReAlloc
1142  *
1143  * Implementation of LocalReAlloc().
1144  */
1145 HLOCAL16 LOCAL_ReAlloc( HANDLE16 ds, HLOCAL16 handle, WORD size, WORD flags )
1146 {
1147     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1148     LOCALHEAPINFO *pInfo;
1149     LOCALARENA *pArena, *pNext;
1150     LOCALHANDLEENTRY *pEntry = NULL;
1151     WORD arena, oldsize;
1152     HLOCAL16 hmem, blockhandle;
1153     LONG nextarena;
1154
1155     if (!handle) return 0;
1156     if(HANDLE_MOVEABLE(handle) &&
1157      ((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
1158         return 0;
1159
1160     TRACE_(local)("%04x %d %04x ds=%04x\n",
1161                    handle, size, flags, ds );
1162     if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1163
1164     if (HANDLE_FIXED( handle ))
1165         blockhandle = handle;
1166     else
1167     {
1168         pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1169         if(pEntry->flags == (LMEM_DISCARDED >> 8))
1170         {
1171             HLOCAL16 hl;
1172             if(pEntry->addr)
1173                 WARN_(local)("Dicarded block has non-zero addr.\n");
1174             TRACE_(local)("ReAllocating discarded block\n");
1175             if(size <= 4) size = 5;
1176             if (!(hl = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags)))
1177                 return 0;
1178             ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1179             pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1180             pEntry->addr = hl + sizeof(HLOCAL16);
1181             pEntry->flags = 0;
1182             pEntry->lock = 0;
1183             *(HLOCAL16 *)(ptr + hl) = handle;
1184             return handle;
1185         }
1186         if (((blockhandle = pEntry->addr) & 3) != 2)
1187         {
1188             ERR_(local)("(%04x,%04x): invalid handle\n",
1189                      ds, handle );
1190             return 0;
1191         }
1192         if(*((HLOCAL16 *)(ptr + blockhandle) - 1) != handle) {
1193             ERR_(local)("Back ptr to handle is invalid\n");
1194             return 0;
1195         }
1196     }
1197
1198     if (flags & LMEM_MODIFY)
1199     {
1200         if (HANDLE_MOVEABLE(handle))
1201         {
1202             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1203             pEntry->flags = (flags & 0x0f00) >> 8;
1204             TRACE_(local)("Changing flags to %x.\n", pEntry->flags);
1205         }
1206         return handle;
1207     }
1208
1209     if (!size)
1210     {
1211         if (flags & LMEM_MOVEABLE)
1212         {
1213             if (HANDLE_FIXED(handle))
1214             {
1215                 TRACE_(local)("Freeing fixed block.\n");
1216                 return LOCAL_Free( ds, handle );
1217             }
1218             else /* Moveable block */
1219             {
1220                 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1221                 if (pEntry->lock == 0)
1222                 {
1223                     /* discards moveable blocks */
1224                     TRACE_(local)("Discarding block\n");
1225                     LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
1226                     pEntry->addr = 0;
1227                     pEntry->flags = (LMEM_DISCARDED >> 8);
1228                     return handle;
1229                 }
1230             }
1231             return 0;
1232         }
1233         else if(flags == 0)
1234         {
1235             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1236             if (pEntry->lock == 0)
1237             {
1238                 /* Frees block */
1239                 return LOCAL_Free( ds, handle );
1240             }
1241         }
1242         return 0;
1243     }
1244
1245     arena = ARENA_HEADER( blockhandle );
1246     TRACE_(local)("arena is %04x\n", arena );
1247     pArena = ARENA_PTR( ptr, arena );
1248
1249     if(size <= 4) size = 5;
1250     oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1251     nextarena = LALIGN(blockhandle + size);
1252
1253       /* Check for size reduction */
1254
1255     if (nextarena <= pArena->next)
1256     {
1257         TRACE_(local)("size reduction, making new free block\n");
1258         LOCAL_ShrinkArena(ds, arena, nextarena - arena);
1259         TRACE_(local)("returning %04x\n", handle );
1260         return handle;
1261     }
1262
1263       /* Check if the next block is free and large enough */
1264
1265     pNext = ARENA_PTR( ptr, pArena->next );
1266     if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1267         (nextarena <= pNext->next))
1268     {
1269         TRACE_(local)("size increase, making new free block\n");
1270         LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
1271         TRACE_(local)("returning %04x\n", handle );
1272         return handle;
1273     }
1274
1275     /* Now we have to allocate a new block, but not if (fixed block or locked
1276        block) and no LMEM_MOVEABLE */
1277
1278     if (!(flags & LMEM_MOVEABLE))
1279     {
1280         if (HANDLE_FIXED(handle))
1281         {
1282             ERR_(local)("Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1283             return 0;
1284         }
1285         else
1286         {
1287             if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
1288             {
1289                 ERR_(local)("Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
1290                 return 0;
1291             }
1292         }
1293     }
1294     if(HANDLE_MOVEABLE(handle)) size += sizeof(HLOCAL16);
1295     hmem = LOCAL_GetBlock( ds, size, flags );
1296     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr                             */
1297     if(HANDLE_MOVEABLE(handle))         /* LOCAL_GetBlock might have triggered    */
1298     {                                   /* a compaction, which might in turn have */
1299       blockhandle = pEntry->addr ;      /* moved the very block we are resizing   */
1300       arena = ARENA_HEADER( blockhandle );   /* thus, we reload arena, too        */
1301     }
1302     if (!hmem)
1303     {
1304         /* Remove the block from the heap and try again */
1305         LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
1306         if (!buffer) return 0;
1307         memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
1308         LOCAL_FreeArena( ds, arena );
1309         if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
1310         {
1311             if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
1312             {
1313                 ERR_(local)("Can't restore saved block\n" );
1314                 HeapFree( GetProcessHeap(), 0, buffer );
1315                 return 0;
1316             }
1317             size = oldsize;
1318         }
1319         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1320         memcpy( ptr + hmem, buffer, oldsize );
1321         HeapFree( GetProcessHeap(), 0, buffer );
1322     }
1323     else
1324     {
1325         memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1326         LOCAL_FreeArena( ds, arena );
1327     }
1328     if (HANDLE_MOVEABLE( handle ))
1329     {
1330         TRACE_(local)("fixing handle\n");
1331         pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1332         pEntry->addr = hmem + sizeof(HLOCAL16);
1333         /* Back ptr should still be correct */
1334         if(*(HLOCAL16 *)(ptr + hmem) != handle)
1335             ERR_(local)("back ptr is invalid.\n");
1336         hmem = handle;
1337     }
1338     if (size == oldsize) hmem = 0;  /* Realloc failed */
1339     TRACE_(local)("returning %04x\n", hmem );
1340     return hmem;
1341 }
1342
1343
1344 /***********************************************************************
1345  *           LOCAL_InternalLock
1346  */
1347 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1348 {
1349     HLOCAL16 old_handle = handle;
1350
1351     if (HANDLE_MOVEABLE(handle))
1352     {
1353         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1354         if (pEntry->flags == LMEM_DISCARDED) return 0;
1355         if (pEntry->lock < 0xfe) pEntry->lock++;
1356         handle = pEntry->addr;
1357     }
1358     TRACE_(local)("%04x returning %04x\n",
1359                    old_handle, handle );
1360     return handle;
1361 }
1362
1363
1364 /***********************************************************************
1365  *           LOCAL_Lock
1366  */
1367 LPSTR LOCAL_Lock( HANDLE16 ds, HLOCAL16 handle )
1368 {
1369     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1370     return handle ? ptr + LOCAL_InternalLock( ptr, handle ) : NULL;
1371 }
1372
1373
1374 /***********************************************************************
1375  *           LOCAL_LockSegptr
1376  */
1377 SEGPTR LOCAL_LockSegptr( HANDLE16 ds, HLOCAL16 handle )
1378 {
1379     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1380     return PTR_SEG_OFF_TO_SEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1381 }
1382
1383
1384 /***********************************************************************
1385  *           LOCAL_Unlock
1386  */
1387 BOOL16 LOCAL_Unlock( HANDLE16 ds, HLOCAL16 handle )
1388 {
1389     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1390
1391     TRACE_(local)("%04x\n", handle );
1392     if (HANDLE_MOVEABLE(handle))
1393     {
1394         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1395         if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1396         /* For moveable block, return the new lock count */
1397         /* (see _Windows_Internals_ p. 197) */
1398         return --pEntry->lock;
1399     }
1400     else return FALSE;
1401 }
1402
1403
1404 /***********************************************************************
1405  *           LOCAL_Size
1406  *
1407  * Implementation of LocalSize().
1408  */
1409 WORD LOCAL_Size( HANDLE16 ds, HLOCAL16 handle )
1410 {
1411     char *ptr = PTR_SEG_OFF_TO_LIN( CURRENT_DS, 0 );
1412     LOCALARENA *pArena;
1413
1414     TRACE_(local)("%04x ds=%04x\n", handle, ds );
1415
1416     if (HANDLE_MOVEABLE( handle )) handle = *(WORD *)(ptr + handle);
1417     if (!handle) return 0;
1418     pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1419     return pArena->next - handle;
1420 }
1421
1422
1423 /***********************************************************************
1424  *           LOCAL_Flags
1425  *
1426  * Implementation of LocalFlags().
1427  */
1428 WORD LOCAL_Flags( HANDLE16 ds, HLOCAL16 handle )
1429 {
1430     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1431
1432     if (HANDLE_MOVEABLE(handle))
1433     {
1434         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1435         TRACE_(local)("(%04x,%04x): returning %04x\n",
1436                        ds, handle, pEntry->lock | (pEntry->flags << 8) );
1437         return pEntry->lock | (pEntry->flags << 8);
1438     }
1439     else
1440     {
1441         TRACE_(local)("(%04x,%04x): returning 0\n",
1442                        ds, handle );
1443         return 0;
1444     }
1445 }
1446
1447
1448 /***********************************************************************
1449  *           LOCAL_HeapSize
1450  *
1451  * Implementation of LocalHeapSize().
1452  */
1453 WORD LOCAL_HeapSize( HANDLE16 ds )
1454 {
1455     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1456     if (!pInfo) return 0;
1457     return pInfo->last - pInfo->first;
1458 }
1459
1460
1461 /***********************************************************************
1462  *           LOCAL_CountFree
1463  *
1464  * Implementation of LocalCountFree().
1465  */
1466 WORD LOCAL_CountFree( HANDLE16 ds )
1467 {
1468     WORD arena, total;
1469     LOCALARENA *pArena;
1470     LOCALHEAPINFO *pInfo;
1471     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1472
1473     if (!(pInfo = LOCAL_GetHeap( ds )))
1474     {
1475         ERR_(local)("(%04x): Local heap not found\n", ds );
1476         LOCAL_PrintHeap( ds );
1477         return 0;
1478     }
1479
1480     total = 0;
1481     arena = pInfo->first;
1482     pArena = ARENA_PTR( ptr, arena );
1483     for (;;)
1484     {
1485         arena = pArena->free_next;
1486         pArena = ARENA_PTR( ptr, arena );
1487         if (arena == pArena->free_next) break;
1488         total += pArena->size;
1489     }
1490     TRACE_(local)("(%04x): returning %d\n", ds, total);
1491     return total;
1492 }
1493
1494
1495 /***********************************************************************
1496  *           LOCAL_Handle
1497  *
1498  * Implementation of LocalHandle().
1499  */
1500 HLOCAL16 LOCAL_Handle( HANDLE16 ds, WORD addr )
1501 {
1502     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1503     LOCALHEAPINFO *pInfo;
1504     WORD table;
1505
1506     if (!(pInfo = LOCAL_GetHeap( ds )))
1507     {
1508         ERR_(local)("(%04x): Local heap not found\n", ds );
1509         LOCAL_PrintHeap( ds );
1510         return 0;
1511     }
1512
1513     /* Find the address in the entry tables */
1514
1515     table = pInfo->htable;
1516     while (table)
1517     {
1518         WORD count = *(WORD *)(ptr + table);
1519         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1520         for (; count > 0; count--, pEntry++)
1521             if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1522         table = *(WORD *)pEntry;
1523     }
1524
1525     return (HLOCAL16)addr;  /* Fixed block handle is addr */
1526 }
1527
1528
1529 /***********************************************************************
1530  *           LocalAlloc16   (KERNEL.5)
1531  */
1532 HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
1533 {
1534     return LOCAL_Alloc( CURRENT_DS, flags, size );
1535 }
1536
1537
1538 /***********************************************************************
1539  *           WIN16_LocalAlloc
1540  */
1541 void WINAPI WIN16_LocalAlloc( CONTEXT86 *context )
1542 {
1543     WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
1544     UINT16 flags = (UINT16)stack[3];
1545     WORD size = (WORD)stack[2];
1546     TRACE_(local)("WIN16LocalAlloc: %04x %d \n", flags, size);
1547     AX_reg(context) = CX_reg(context) = LOCAL_Alloc( DS_reg(context), flags, size );
1548 }
1549
1550
1551 /***********************************************************************
1552  *           LocalReAlloc16   (KERNEL.6)
1553  */
1554 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1555 {
1556     return LOCAL_ReAlloc( CURRENT_DS, handle, size, flags );
1557 }
1558
1559
1560 /***********************************************************************
1561  *           LocalFree16   (KERNEL.7)
1562  */
1563 HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
1564 {
1565     return LOCAL_Free( CURRENT_DS, handle );
1566 }
1567
1568
1569 /***********************************************************************
1570  *           LocalLock16   (KERNEL.8)
1571  *
1572  * Note: only the offset part of the pointer is returned by the relay code.
1573  */
1574 SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
1575 {
1576     return LOCAL_LockSegptr( CURRENT_DS, handle );
1577 }
1578
1579
1580 /***********************************************************************
1581  *           LocalUnlock16   (KERNEL.9)
1582  */
1583 BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
1584 {
1585     return LOCAL_Unlock( CURRENT_DS, handle );
1586 }
1587
1588
1589 /***********************************************************************
1590  *           LocalSize16   (KERNEL.10)
1591  */
1592 UINT16 WINAPI LocalSize16( HLOCAL16 handle )
1593 {
1594     return LOCAL_Size( CURRENT_DS, handle );
1595 }
1596
1597
1598 /***********************************************************************
1599  *           LocalHandle16   (KERNEL.11)
1600  */
1601 HLOCAL16 WINAPI LocalHandle16( WORD addr )
1602 {
1603     return LOCAL_Handle( CURRENT_DS, addr );
1604 }
1605
1606
1607 /***********************************************************************
1608  *           LocalFlags16   (KERNEL.12)
1609  */
1610 UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
1611 {
1612     return LOCAL_Flags( CURRENT_DS, handle );
1613 }
1614
1615
1616 /***********************************************************************
1617  *           LocalCompact16   (KERNEL.13)
1618  */
1619 UINT16 WINAPI LocalCompact16( UINT16 minfree )
1620 {
1621     TRACE_(local)("%04x\n", minfree );
1622     return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1623 }
1624
1625
1626 /***********************************************************************
1627  *           LocalNotify   (KERNEL.14)
1628  *
1629  * Installs a callback function that is called for local memory events
1630  * Callback function prototype is
1631  * BOOL16 NotifyFunc(WORD wMsg, HLOCAL16 hMem, WORD wArg)
1632  * wMsg:
1633  * - LN_OUTOFMEM
1634  *   NotifyFunc seems to be responsible for allocating some memory,
1635  *   returns TRUE for success.
1636  *   wArg = number of bytes needed additionally
1637  * - LN_MOVE
1638  *   hMem = handle; wArg = old mem location
1639  * - LN_DISCARD
1640  *   NotifyFunc seems to be strongly encouraged to return TRUE,
1641  *   otherwise LogError() gets called.
1642  *   hMem = handle; wArg = flags
1643  */
1644 FARPROC16 WINAPI LocalNotify16( FARPROC16 func )
1645 {
1646     LOCALHEAPINFO *pInfo;
1647     FARPROC16 oldNotify;
1648     HANDLE16 ds = CURRENT_DS;
1649
1650     if (!(pInfo = LOCAL_GetHeap( ds )))
1651     {
1652         ERR_(local)("(%04x): Local heap not found\n", ds );
1653         LOCAL_PrintHeap( ds );
1654         return 0;
1655     }
1656     TRACE_(local)("(%04x): %08lx\n", ds, (DWORD)func );
1657     FIXME_(local)("Half implemented\n");
1658     oldNotify = pInfo->notify;
1659     pInfo->notify = func;
1660     return oldNotify;
1661 }
1662
1663
1664 /***********************************************************************
1665  *           LocalShrink16   (KERNEL.121)
1666  */
1667 UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1668 {
1669     TRACE_(local)("%04x %04x\n", handle, newsize );
1670     return 0;
1671 }
1672
1673
1674 /***********************************************************************
1675  *           GetHeapSpaces   (KERNEL.138)
1676  */
1677 DWORD WINAPI GetHeapSpaces16( HMODULE16 module )
1678 {
1679     NE_MODULE *pModule;
1680     WORD ds;
1681
1682     if (!(pModule = NE_GetPtr( module ))) return 0;
1683     ds =
1684     GlobalHandleToSel16((NE_SEG_TABLE( pModule ) + pModule->dgroup - 1)->hSeg);
1685     return MAKELONG( LOCAL_CountFree( ds ), LOCAL_HeapSize( ds ) );
1686 }
1687
1688
1689 /***********************************************************************
1690  *           LocalCountFree   (KERNEL.161)
1691  */
1692 WORD WINAPI LocalCountFree16(void)
1693 {
1694     return LOCAL_CountFree( CURRENT_DS );
1695 }
1696
1697
1698 /***********************************************************************
1699  *           LocalHeapSize   (KERNEL.162)
1700  */
1701 WORD WINAPI LocalHeapSize16(void)
1702 {
1703     TRACE_(local)("(void)\n" );
1704     return LOCAL_HeapSize( CURRENT_DS );
1705 }
1706
1707
1708 /***********************************************************************
1709  *           LocalHandleDelta   (KERNEL.310)
1710  */
1711 WORD WINAPI LocalHandleDelta16( WORD delta )
1712 {
1713     LOCALHEAPINFO *pInfo;
1714
1715     if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1716     {
1717         ERR_(local)("Local heap not found\n");
1718         LOCAL_PrintHeap( CURRENT_DS );
1719         return 0;
1720     }
1721     if (delta) pInfo->hdelta = delta;
1722     TRACE_(local)("returning %04x\n", pInfo->hdelta);
1723     return pInfo->hdelta;
1724 }
1725
1726
1727 /***********************************************************************
1728  *           LocalInfo   (TOOLHELP.56)
1729  */
1730 BOOL16 WINAPI LocalInfo16( LOCALINFO *pLocalInfo, HGLOBAL16 handle )
1731 {
1732     LOCALHEAPINFO *pInfo = LOCAL_GetHeap(SELECTOROF(WIN16_GlobalLock16(handle)));
1733     if (!pInfo) return FALSE;
1734     pLocalInfo->wcItems = pInfo->items;
1735     return TRUE;
1736 }
1737
1738
1739 /***********************************************************************
1740  *           LocalFirst   (TOOLHELP.57)
1741  */
1742 BOOL16 WINAPI LocalFirst16( LOCALENTRY *pLocalEntry, HGLOBAL16 handle )
1743 {
1744     WORD ds = GlobalHandleToSel16( handle );
1745     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1746     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1747     if (!pInfo) return FALSE;
1748
1749     pLocalEntry->hHandle   = pInfo->first + ARENA_HEADER_SIZE;
1750     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1751     pLocalEntry->wFlags    = LF_FIXED;
1752     pLocalEntry->wcLock    = 0;
1753     pLocalEntry->wType     = LT_NORMAL;
1754     pLocalEntry->hHeap     = handle;
1755     pLocalEntry->wHeapType = NORMAL_HEAP;
1756     pLocalEntry->wNext     = ARENA_PTR(ptr,pInfo->first)->next;
1757     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1758     return TRUE;
1759 }
1760
1761
1762 /***********************************************************************
1763  *           LocalNext   (TOOLHELP.58)
1764  */
1765 BOOL16 WINAPI LocalNext16( LOCALENTRY *pLocalEntry )
1766 {
1767     WORD ds = GlobalHandleToSel16( pLocalEntry->hHeap );
1768     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1769     LOCALARENA *pArena;
1770
1771     if (!LOCAL_GetHeap( ds )) return FALSE;
1772     if (!pLocalEntry->wNext) return FALSE;
1773     pArena = ARENA_PTR( ptr, pLocalEntry->wNext );
1774
1775     pLocalEntry->hHandle   = pLocalEntry->wNext + ARENA_HEADER_SIZE;
1776     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1777     pLocalEntry->wFlags    = (pArena->prev & 3) + 1;
1778     pLocalEntry->wcLock    = 0;
1779     pLocalEntry->wType     = LT_NORMAL;
1780     if (pArena->next != pLocalEntry->wNext)  /* last one? */
1781         pLocalEntry->wNext = pArena->next;
1782     else
1783         pLocalEntry->wNext = 0;
1784     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1785     return TRUE;
1786 }
1787
1788
1789 /***********************************************************************
1790  *           LocalAlloc32   (KERNEL32.371)
1791  * RETURNS
1792  *      Handle: Success
1793  *      NULL: Failure
1794  */
1795 HLOCAL WINAPI LocalAlloc(
1796                 UINT flags, /* [in] Allocation attributes */
1797                 DWORD size    /* [in] Number of bytes to allocate */
1798 ) {
1799     return (HLOCAL)GlobalAlloc( flags, size );
1800 }
1801
1802
1803 /***********************************************************************
1804  *           LocalCompact32   (KERNEL32.372)
1805  */
1806 UINT WINAPI LocalCompact( UINT minfree )
1807 {
1808     return 0;  /* LocalCompact does nothing in Win32 */
1809 }
1810
1811
1812 /***********************************************************************
1813  *           LocalFlags32   (KERNEL32.374)
1814  * RETURNS
1815  *      Value specifying allocation flags and lock count.
1816  *      LMEM_INVALID_HANDLE: Failure
1817  */
1818 UINT WINAPI LocalFlags(
1819               HLOCAL handle /* [in] Handle of memory object */
1820 ) {
1821     return GlobalFlags( (HGLOBAL)handle );
1822 }
1823
1824
1825 /***********************************************************************
1826  *           LocalFree32   (KERNEL32.375)
1827  * RETURNS
1828  *      NULL: Success
1829  *      Handle: Failure
1830  */
1831 HLOCAL WINAPI LocalFree(
1832                 HLOCAL handle /* [in] Handle of memory object */
1833 ) {
1834     return (HLOCAL)GlobalFree( (HGLOBAL)handle );
1835 }
1836
1837
1838 /***********************************************************************
1839  *           LocalHandle32   (KERNEL32.376)
1840  * RETURNS
1841  *      Handle: Success
1842  *      NULL: Failure
1843  */
1844 HLOCAL WINAPI LocalHandle(
1845                 LPCVOID ptr /* [in] Address of local memory object */
1846 ) {
1847     return (HLOCAL)GlobalHandle( ptr );
1848 }
1849
1850
1851 /***********************************************************************
1852  *           LocalLock32   (KERNEL32.377)
1853  * Locks a local memory object and returns pointer to the first byte
1854  * of the memory block.
1855  *
1856  * RETURNS
1857  *      Pointer: Success
1858  *      NULL: Failure
1859  */
1860 LPVOID WINAPI LocalLock(
1861               HLOCAL handle /* [in] Address of local memory object */
1862 ) {
1863     return GlobalLock( (HGLOBAL)handle );
1864 }
1865
1866
1867 /***********************************************************************
1868  *           LocalReAlloc32   (KERNEL32.378)
1869  * RETURNS
1870  *      Handle: Success
1871  *      NULL: Failure
1872  */
1873 HLOCAL WINAPI LocalReAlloc(
1874                 HLOCAL handle, /* [in] Handle of memory object */
1875                 DWORD size,      /* [in] New size of block */
1876                 UINT flags     /* [in] How to reallocate object */
1877 ) {
1878     return (HLOCAL)GlobalReAlloc( (HGLOBAL)handle, size, flags );
1879 }
1880
1881
1882 /***********************************************************************
1883  *           LocalShrink32   (KERNEL32.379)
1884  */
1885 UINT WINAPI LocalShrink( HGLOBAL handle, UINT newsize )
1886 {
1887     return 0;  /* LocalShrink does nothing in Win32 */
1888 }
1889
1890
1891 /***********************************************************************
1892  *           LocalSize32   (KERNEL32.380)
1893  * RETURNS
1894  *      Size: Success
1895  *      0: Failure
1896  */
1897 UINT WINAPI LocalSize(
1898               HLOCAL handle /* [in] Handle of memory object */
1899 ) {
1900     return GlobalSize( (HGLOBAL)handle );
1901 }
1902
1903
1904 /***********************************************************************
1905  *           LocalUnlock32   (KERNEL32.381)
1906  * RETURNS
1907  *      TRUE: Object is still locked
1908  *      FALSE: Object is unlocked
1909  */
1910 BOOL WINAPI LocalUnlock(
1911               HLOCAL handle /* [in] Handle of memory object */
1912 ) {
1913     return GlobalUnlock( (HGLOBAL)handle );
1914 }