memory/local.c

   1 /*
   2  * Local heap functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  * Copyright 1996 Huw Davies
   6  */
   7
   8 /*
   9  * Note:
  10  * All local heap functions need the current DS as first parameter
  11  * when called from the emulation library, so they take one more
  12  * parameter than usual.
  13  */
  14
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include "windows.h"
  18 #include "ldt.h"
  19 #include "task.h"
  20 #include "global.h"
  21 #include "heap.h"
  22 #include "instance.h"
  23 #include "local.h"
  24 #include "module.h"
  25 #include "stackframe.h"
  26 #include "toolhelp.h"
  27 #include "debug.h"
  28
  29 typedef struct
  30 {
  31 /* Arena header */
  32     WORD prev;          /* Previous arena | arena type */
  33     WORD next;          /* Next arena */
  34 /* Start of the memory block or free-list info */
  35     WORD size;          /* Size of the free block */
  36     WORD free_prev;     /* Previous free block */
  37     WORD free_next;     /* Next free block */
  38 } LOCALARENA;
  39
  40 #define ARENA_HEADER_SIZE      4
  41 #define ARENA_HEADER( handle) ( ((handle) & ~3) - ARENA_HEADER_SIZE)
  42
  43   /* Arena types (stored in 'prev' field of the arena) */
  44 #define LOCAL_ARENA_FREE       0
  45 #define LOCAL_ARENA_FIXED      1
  46
  47 /* Layout of a handle entry table
  48  *
  49  * WORD                     count of entries
  50  * LOCALHANDLEENTRY[count]  entries
  51  * WORD                     near ptr to next table
  52  */
  53 typedef struct
  54 {
  55     WORD addr;                /* Address of the MOVEABLE block */
  56     BYTE flags;               /* Flags for this block */
  57     BYTE lock;                /* Lock count */
  58 } LOCALHANDLEENTRY;
  59
  60 /*
  61  * We make addr = 4n + 2 and set *((WORD *)addr - 1) = &addr like Windows does
  62  * in case something actually relies on this.
  63  * Note the ARENA_HEADER(addr) still produces the desired result ie. 4n - 4
  64  *
  65  * An unused handle has lock = flags = 0xff. In windows addr is that of next
  66  * free handle, at the moment in wine we set it to 0.
  67  *
  68  * A discarded block's handle has lock = addr = 0 and flags = 0x40
  69  * (LMEM_DISCARDED >> 8)
  70  */
  71
  72 #pragma pack(1)
  73
  74 typedef struct
  75 {
  76     WORD check;                 /* 00 Heap checking flag */
  77     WORD freeze;                /* 02 Heap frozen flag */
  78     WORD items;                 /* 04 Count of items on the heap */
  79     WORD first;                 /* 06 First item of the heap */
  80     WORD pad1;                  /* 08 Always 0 */
  81     WORD last;                  /* 0a Last item of the heap */
  82     WORD pad2;                  /* 0c Always 0 */
  83     BYTE ncompact;              /* 0e Compactions counter */
  84     BYTE dislevel;              /* 0f Discard level */
  85     DWORD distotal;             /* 10 Total bytes discarded */
  86     WORD htable;                /* 14 Pointer to handle table */
  87     WORD hfree;                 /* 16 Pointer to free handle table */
  88     WORD hdelta;                /* 18 Delta to expand the handle table */
  89     WORD expand;                /* 1a Pointer to expand function (unused) */
  90     WORD pstat;                 /* 1c Pointer to status structure (unused) */
  91     FARPROC16 notify WINE_PACKED; /* 1e Pointer to LocalNotify() function */
  92     WORD lock;                  /* 22 Lock count for the heap */
  93     WORD extra;                 /* 24 Extra bytes to allocate when expanding */
  94     WORD minsize;               /* 26 Minimum size of the heap */
  95     WORD magic;                 /* 28 Magic number */
  96 } LOCALHEAPINFO;
  97
  98 #pragma pack(4)
  99
 100 #define LOCAL_HEAP_MAGIC  0x484c  /* 'LH' */
 101
 102 WORD USER_HeapSel = 0;  /* USER heap selector */
 103 WORD GDI_HeapSel = 0;   /* GDI heap selector */
 104
 105   /* All local heap allocations are aligned on 4-byte boundaries */
 106 #define LALIGN(word)          (((word) + 3) & ~3)
 107
 108 #define ARENA_PTR(ptr,arena)       ((LOCALARENA *)((char*)(ptr)+(arena)))
 109 #define ARENA_PREV(ptr,arena)      (ARENA_PTR((ptr),(arena))->prev & ~3)
 110 #define ARENA_NEXT(ptr,arena)      (ARENA_PTR((ptr),(arena))->next)
 111 #define ARENA_FLAGS(ptr,arena)     (ARENA_PTR((ptr),(arena))->prev & 3)
 112
 113   /* determine whether the handle belongs to a fixed or a moveable block */
 114 #define HANDLE_FIXED(handle) (((handle) & 3) == 0)
 115 #define HANDLE_MOVEABLE(handle) (((handle) & 3) == 2)
 116
 117 /***********************************************************************
 118  *           LOCAL_GetHeap
 119  *
 120  * Return a pointer to the local heap, making sure it exists.
 121  */
 122 static LOCALHEAPINFO *LOCAL_GetHeap( HANDLE16 ds )
 123 {
 124     LOCALHEAPINFO *pInfo;
 125     INSTANCEDATA *ptr = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( ds, 0 );
 126     TRACE(local, "Heap at %p, %04x\n", ptr, ptr->heap );
 127     if (!ptr || !ptr->heap) return NULL;
 128     if (IsBadReadPtr16( (SEGPTR)MAKELONG(ptr->heap,ds), sizeof(LOCALHEAPINFO)))
 129         return NULL;
 130     pInfo = (LOCALHEAPINFO*)((char*)ptr + ptr->heap);
 131     if (pInfo->magic != LOCAL_HEAP_MAGIC) return NULL;
 132     return pInfo;
 133 }
 134
 135
 136 /***********************************************************************
 137  *           LOCAL_MakeBlockFree
 138  *
 139  * Make a block free, inserting it in the free-list.
 140  * 'block' is the handle of the block arena; 'baseptr' points to
 141  * the beginning of the data segment containing the heap.
 142  */
 143 static void LOCAL_MakeBlockFree( char *baseptr, WORD block )
 144 {
 145     LOCALARENA *pArena, *pNext;
 146     WORD next;
 147
 148       /* Mark the block as free */
 149
 150     pArena = ARENA_PTR( baseptr, block );
 151     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FREE;
 152     pArena->size = pArena->next - block;
 153
 154       /* Find the next free block (last block is always free) */
 155
 156     next = pArena->next;
 157     for (;;)
 158     {
 159         pNext = ARENA_PTR( baseptr, next );
 160         if ((pNext->prev & 3) == LOCAL_ARENA_FREE) break;
 161         next = pNext->next;
 162     }
 163
 164     TRACE(local, "Local_MakeBlockFree %04x, next %04x\n", block, next );
 165       /* Insert the free block in the free-list */
 166
 167     pArena->free_prev = pNext->free_prev;
 168     pArena->free_next = next;
 169     ARENA_PTR(baseptr,pNext->free_prev)->free_next = block;
 170     pNext->free_prev  = block;
 171 }
 172
 173
 174 /***********************************************************************
 175  *           LOCAL_RemoveFreeBlock
 176  *
 177  * Remove a block from the free-list.
 178  * 'block' is the handle of the block arena; 'baseptr' points to
 179  * the beginning of the data segment containing the heap.
 180  */
 181 static void LOCAL_RemoveFreeBlock( char *baseptr, WORD block )
 182 {
 183       /* Mark the block as fixed */
 184
 185     LOCALARENA *pArena = ARENA_PTR( baseptr, block );
 186     pArena->prev = (pArena->prev & ~3) | LOCAL_ARENA_FIXED;
 187
 188       /* Remove it from the list */
 189
 190     ARENA_PTR(baseptr,pArena->free_prev)->free_next = pArena->free_next;
 191     ARENA_PTR(baseptr,pArena->free_next)->free_prev = pArena->free_prev;
 192 }
 193
 194
 195 /***********************************************************************
 196  *           LOCAL_AddBlock
 197  *
 198  * Insert a new block in the heap.
 199  * 'new' is the handle of the new block arena; 'baseptr' points to
 200  * the beginning of the data segment containing the heap; 'prev' is
 201  * the block before the new one.
 202  */
 203 static void LOCAL_AddBlock( char *baseptr, WORD prev, WORD new )
 204 {
 205     LOCALARENA *pPrev = ARENA_PTR( baseptr, prev );
 206     LOCALARENA *pNew  = ARENA_PTR( baseptr, new );
 207
 208     pNew->prev = (prev & ~3) | LOCAL_ARENA_FIXED;
 209     pNew->next = pPrev->next;
 210     ARENA_PTR(baseptr,pPrev->next)->prev &= 3;
 211     ARENA_PTR(baseptr,pPrev->next)->prev |= new;
 212     pPrev->next = new;
 213 }
 214
 215
 216 /***********************************************************************
 217  *           LOCAL_RemoveBlock
 218  *
 219  * Remove a block from the heap.
 220  * 'block' is the handle of the block arena; 'baseptr' points to
 221  * the beginning of the data segment containing the heap.
 222  */
 223 static void LOCAL_RemoveBlock( char *baseptr, WORD block )
 224 {
 225     LOCALARENA *pArena, *pTmp;
 226
 227       /* Remove the block from the free-list */
 228
 229     TRACE(local, "Local_RemoveBlock\n");
 230     pArena = ARENA_PTR( baseptr, block );
 231     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 232         LOCAL_RemoveFreeBlock( baseptr, block );
 233
 234       /* If the previous block is free, expand its size */
 235
 236     pTmp = ARENA_PTR( baseptr, pArena->prev & ~3 );
 237     if ((pTmp->prev & 3) == LOCAL_ARENA_FREE)
 238         pTmp->size += pArena->next - block;
 239
 240       /* Remove the block from the linked list */
 241
 242     pTmp->next = pArena->next;
 243     pTmp = ARENA_PTR( baseptr, pArena->next );
 244     pTmp->prev = (pTmp->prev & 3) | (pArena->prev & ~3);
 245 }
 246
 247
 248 /***********************************************************************
 249  *           LOCAL_PrintHeap
 250  */
 251 static void LOCAL_PrintHeap( HANDLE16 ds )
 252 {
 253     char *ptr;
 254     LOCALHEAPINFO *pInfo;
 255     WORD arena;
 256
 257     /* FIXME - the test should be done when calling the function!
 258                plus is not clear that we should print this info
 259                only when TRACE_ON is on! */
 260     if(!TRACE_ON(local)) return;
 261
 262     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 263     pInfo = LOCAL_GetHeap( ds );
 264
 265     if (!pInfo)
 266     {
 267         DUMP( "Local Heap corrupted!  ds=%04x\n", ds );
 268         return;
 269     }
 270     DUMP( "Local Heap  ds=%04x first=%04x last=%04x items=%d\n",
 271           ds, pInfo->first, pInfo->last, pInfo->items );
 272
 273     arena = pInfo->first;
 274     for (;;)
 275     {
 276         LOCALARENA *pArena = ARENA_PTR(ptr,arena);
 277         DUMP( "  %04x: prev=%04x next=%04x type=%d\n", arena,
 278               pArena->prev & ~3, pArena->next, pArena->prev & 3 );
 279         if (arena == pInfo->first)
 280         {
 281             DUMP( "        size=%d free_prev=%04x free_next=%04x\n",
 282                   pArena->size, pArena->free_prev, pArena->free_next );
 283         }
 284         if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 285         {
 286             DUMP( "        size=%d free_prev=%04x free_next=%04x\n",
 287                   pArena->size, pArena->free_prev, pArena->free_next );
 288             if (pArena->next == arena) break;  /* last one */
 289             if (ARENA_PTR(ptr,pArena->free_next)->free_prev != arena)
 290             {
 291                 DUMP( "*** arena->free_next->free_prev != arena\n" );
 292                 break;
 293             }
 294         }
 295         if (pArena->next == arena)
 296         {
 297             DUMP( "*** last block is not marked free\n" );
 298             break;
 299         }
 300         if ((ARENA_PTR(ptr,pArena->next)->prev & ~3) != arena)
 301         {
 302             DUMP( "*** arena->next->prev != arena (%04x, %04x)\n",
 303                   pArena->next, ARENA_PTR(ptr,pArena->next)->prev);
 304             break;
 305         }
 306         arena = pArena->next;
 307     }
 308 }
 309
 310
 311 /***********************************************************************
 312  *           LocalInit   (KERNEL.4)
 313  */
 314 BOOL16 WINAPI LocalInit( HANDLE16 selector, WORD start, WORD end )
 315 {
 316     char *ptr;
 317     WORD heapInfoArena, freeArena, lastArena;
 318     LOCALHEAPINFO *pHeapInfo;
 319     LOCALARENA *pArena, *pFirstArena, *pLastArena;
 320     NE_MODULE *pModule;
 321
 322       /* The initial layout of the heap is: */
 323       /* - first arena         (FIXED)      */
 324       /* - heap info structure (FIXED)      */
 325       /* - large free block    (FREE)       */
 326       /* - last arena          (FREE)       */
 327
 328     TRACE(local, "%04x %04x-%04x\n", selector, start, end);
 329     if (!selector) selector = CURRENT_DS;
 330
 331     if (TRACE_ON(heap))
 332     {
 333         /* If TRACE_ON(heap) is set, the global heap blocks are */
 334         /* cleared before use, so we can test for double initialization. */
 335         if (LOCAL_GetHeap(selector))
 336         {
 337             WARN(local, "Heap %04x initialized twice.\n", selector);
 338             LOCAL_PrintHeap(selector);
 339         }
 340     }
 341
 342     if (start == 0) {
 343       /* Check if the segment is the DGROUP of a module */
 344
 345         if ((pModule = NE_GetPtr( selector )))
 346         {
 347             SEGTABLEENTRY *pSeg = NE_SEG_TABLE( pModule ) + pModule->dgroup - 1;
 348             if (pModule->dgroup && (pSeg->selector == selector)) {
 349                 /* We can't just use the simple method of using the value
 350                  * of minsize + stacksize, since there are programs that
 351                  * resize the data segment before calling InitTask(). So,
 352                  * we must put it at the end of the segment */
 353                 start = GlobalSize16( GlobalHandle16( selector ) );
 354                 start -= end;
 355                 end += start;
 356                 TRACE(local," new start %04x, minstart: %04x\n", start, pSeg->minsize + pModule->stack_size);
 357             }
 358         }
 359     }
 360     ptr = PTR_SEG_OFF_TO_LIN( selector, 0 );
 361
 362     start = LALIGN( MAX( start, sizeof(INSTANCEDATA) ) );
 363     heapInfoArena = LALIGN(start + sizeof(LOCALARENA) );
 364     freeArena = LALIGN( heapInfoArena + ARENA_HEADER_SIZE
 365                         + sizeof(LOCALHEAPINFO) );
 366     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 367
 368       /* Make sure there's enough space.       */
 369
 370     if (freeArena + sizeof(LOCALARENA) >= lastArena) return FALSE;
 371
 372       /* Initialise the first arena */
 373
 374     pFirstArena = ARENA_PTR( ptr, start );
 375     pFirstArena->prev      = start | LOCAL_ARENA_FIXED;
 376     pFirstArena->next      = heapInfoArena;
 377     pFirstArena->size      = LALIGN(sizeof(LOCALARENA));
 378     pFirstArena->free_prev = start;  /* this one */
 379     pFirstArena->free_next = freeArena;
 380
 381       /* Initialise the arena of the heap info structure */
 382
 383     pArena = ARENA_PTR( ptr, heapInfoArena );
 384     pArena->prev = start | LOCAL_ARENA_FIXED;
 385     pArena->next = freeArena;
 386
 387       /* Initialise the heap info structure */
 388
 389     pHeapInfo = (LOCALHEAPINFO *) (ptr + heapInfoArena + ARENA_HEADER_SIZE );
 390     memset( pHeapInfo, 0, sizeof(LOCALHEAPINFO) );
 391     pHeapInfo->items   = 4;
 392     pHeapInfo->first   = start;
 393     pHeapInfo->last    = lastArena;
 394     pHeapInfo->htable  = 0;
 395     pHeapInfo->hdelta  = 0x20;
 396     pHeapInfo->extra   = 0x200;
 397     pHeapInfo->minsize = lastArena - freeArena;
 398     pHeapInfo->magic   = LOCAL_HEAP_MAGIC;
 399
 400       /* Initialise the large free block */
 401
 402     pArena = ARENA_PTR( ptr, freeArena );
 403     pArena->prev      = heapInfoArena | LOCAL_ARENA_FREE;
 404     pArena->next      = lastArena;
 405     pArena->size      = lastArena - freeArena;
 406     pArena->free_prev = start;
 407     pArena->free_next = lastArena;
 408
 409       /* Initialise the last block */
 410
 411     pLastArena = ARENA_PTR( ptr, lastArena );
 412     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 413     pLastArena->next      = lastArena;  /* this one */
 414     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 415     pLastArena->free_prev = freeArena;
 416     pLastArena->free_next = lastArena;  /* this one */
 417
 418       /* Store the local heap address in the instance data */
 419
 420     ((INSTANCEDATA *)ptr)->heap = heapInfoArena + ARENA_HEADER_SIZE;
 421     LOCAL_PrintHeap( selector );
 422     return TRUE;
 423 }
 424
 425 /***********************************************************************
 426  *           LOCAL_GrowHeap
 427  */
 428 static void LOCAL_GrowHeap( HANDLE16 ds )
 429 {
 430     HANDLE16 hseg = GlobalHandle16( ds );
 431     LONG oldsize = GlobalSize16( hseg );
 432     LONG end;
 433     LOCALHEAPINFO *pHeapInfo;
 434     WORD freeArena, lastArena;
 435     LOCALARENA *pArena, *pLastArena;
 436     char *ptr;
 437
 438     /* if nothing can be gained, return */
 439     if (oldsize > 0xfff0) return;
 440     hseg = GlobalReAlloc16( hseg, 0x10000, GMEM_FIXED );
 441     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 442     pHeapInfo = LOCAL_GetHeap( ds );
 443     if (pHeapInfo == NULL) {
 444         WARN(local, "Heap not found\n" );
 445         return;
 446     }
 447     end = GlobalSize16( hseg );
 448     lastArena = (end - sizeof(LOCALARENA)) & ~3;
 449
 450       /* Update the HeapInfo */
 451     pHeapInfo->items++;
 452     freeArena = pHeapInfo->last;
 453     pHeapInfo->last = lastArena;
 454     pHeapInfo->minsize += end - oldsize;
 455
 456       /* grow the old last block */
 457     pArena = ARENA_PTR( ptr, freeArena );
 458     pArena->size      = lastArena - freeArena;
 459     pArena->next      = lastArena;
 460     pArena->free_next = lastArena;
 461
 462       /* Initialise the new last block */
 463
 464     pLastArena = ARENA_PTR( ptr, lastArena );
 465     pLastArena->prev      = freeArena | LOCAL_ARENA_FREE;
 466     pLastArena->next      = lastArena;  /* this one */
 467     pLastArena->size      = LALIGN(sizeof(LOCALARENA));
 468     pLastArena->free_prev = freeArena;
 469     pLastArena->free_next = lastArena;  /* this one */
 470
 471     /* If block before freeArena is also free then merge them */
 472     if((ARENA_PTR(ptr, (pArena->prev & ~3))->prev & 3) == LOCAL_ARENA_FREE)
 473     {
 474         LOCAL_RemoveBlock(ptr, freeArena);
 475         pHeapInfo->items--;
 476     }
 477
 478     TRACE(local, "Heap expanded\n" );
 479     LOCAL_PrintHeap( ds );
 480 }
 481
 482
 483 /***********************************************************************
 484  *           LOCAL_FreeArena
 485  */
 486 static HLOCAL16 LOCAL_FreeArena( WORD ds, WORD arena )
 487 {
 488     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 489     LOCALHEAPINFO *pInfo;
 490     LOCALARENA *pArena, *pPrev, *pNext;
 491
 492     TRACE(local, "%04x ds=%04x\n", arena, ds );
 493     if (!(pInfo = LOCAL_GetHeap( ds ))) return arena;
 494
 495     pArena = ARENA_PTR( ptr, arena );
 496     if ((pArena->prev & 3) == LOCAL_ARENA_FREE)
 497     {
 498         /* shouldn't happen */
 499         WARN(local, "Trying to free block %04x twice!\n",
 500                  arena );
 501         LOCAL_PrintHeap( ds );
 502         return arena;
 503     }
 504
 505       /* Check if we can merge with the previous block */
 506
 507     pPrev = ARENA_PTR( ptr, pArena->prev & ~3 );
 508     pNext = ARENA_PTR( ptr, pArena->next );
 509     if ((pPrev->prev & 3) == LOCAL_ARENA_FREE)
 510     {
 511         arena  = pArena->prev & ~3;
 512         pArena = pPrev;
 513         LOCAL_RemoveBlock( ptr, pPrev->next );
 514         pInfo->items--;
 515     }
 516     else  /* Make a new free block */
 517     {
 518         LOCAL_MakeBlockFree( ptr, arena );
 519     }
 520
 521       /* Check if we can merge with the next block */
 522
 523     if ((pArena->next == pArena->free_next) &&
 524         (pArena->next != pInfo->last))
 525     {
 526         LOCAL_RemoveBlock( ptr, pArena->next );
 527         pInfo->items--;
 528     }
 529     return 0;
 530 }
 531
 532
 533 /***********************************************************************
 534  *           LOCAL_ShrinkArena
 535  *
 536  * Shrink an arena by creating a free block at its end if possible.
 537  * 'size' includes the arena header, and must be aligned.
 538  */
 539 static void LOCAL_ShrinkArena( WORD ds, WORD arena, WORD size )
 540 {
 541     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 542     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 543
 544     if (arena + size + LALIGN(sizeof(LOCALARENA)) < pArena->next)
 545     {
 546         LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
 547         if (!pInfo) return;
 548         LOCAL_AddBlock( ptr, arena, arena + size );
 549         pInfo->items++;
 550         LOCAL_FreeArena( ds, arena + size );
 551     }
 552 }
 553
 554
 555 /***********************************************************************
 556  *           LOCAL_GrowArenaDownward
 557  *
 558  * Grow an arena downward by using the previous arena (must be free).
 559  */
 560 static void LOCAL_GrowArenaDownward( WORD ds, WORD arena, WORD newsize )
 561 {
 562     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 563     LOCALHEAPINFO *pInfo;
 564     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 565     WORD prevArena = pArena->prev & ~3;
 566     LOCALARENA *pPrevArena = ARENA_PTR( ptr, prevArena );
 567     WORD offset, size;
 568     char *p;
 569
 570     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 571     offset = pPrevArena->size;
 572     size = pArena->next - arena - ARENA_HEADER_SIZE;
 573     LOCAL_RemoveFreeBlock( ptr, prevArena );
 574     LOCAL_RemoveBlock( ptr, arena );
 575     pInfo->items--;
 576     p = (char *)pPrevArena + ARENA_HEADER_SIZE;
 577     while (offset < size)
 578     {
 579         memcpy( p, p + offset, offset );
 580         p += offset;
 581         size -= offset;
 582     }
 583     if (size) memcpy( p, p + offset, size );
 584     LOCAL_ShrinkArena( ds, prevArena, newsize );
 585 }
 586
 587
 588
 589 /***********************************************************************
 590  *           LOCAL_GrowArenaUpward
 591  *
 592  * Grow an arena upward by using the next arena (must be free and big
 593  * enough). Newsize includes the arena header and must be aligned.
 594  */
 595 static void LOCAL_GrowArenaUpward( WORD ds, WORD arena, WORD newsize )
 596 {
 597     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 598     LOCALHEAPINFO *pInfo;
 599     LOCALARENA *pArena = ARENA_PTR( ptr, arena );
 600     WORD nextArena = pArena->next;
 601
 602     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 603     LOCAL_RemoveBlock( ptr, nextArena );
 604     pInfo->items--;
 605     LOCAL_ShrinkArena( ds, arena, newsize );
 606 }
 607
 608
 609 /***********************************************************************
 610  *           LOCAL_GetFreeSpace
 611  */
 612 static WORD LOCAL_GetFreeSpace(WORD ds, WORD countdiscard)
 613 {
 614     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 615     LOCALHEAPINFO *pInfo;
 616     LOCALARENA *pArena;
 617     WORD arena;
 618     WORD freespace = 0;
 619
 620     if (!(pInfo = LOCAL_GetHeap( ds )))
 621     {
 622         WARN(local, "Local heap not found\n" );
 623         LOCAL_PrintHeap(ds);
 624         return 0;
 625     }
 626     arena = pInfo->first;
 627     pArena = ARENA_PTR( ptr, arena );
 628     while (arena != pArena->free_next)
 629     {
 630         arena = pArena->free_next;
 631         pArena = ARENA_PTR( ptr, arena );
 632         if (pArena->size >= freespace) freespace = pArena->size;
 633     }
 634     /* FIXME doesn't yet calculate space that would become free if everything
 635        were discarded when countdiscard == 1 */
 636     if (freespace < ARENA_HEADER_SIZE) freespace = 0;
 637     else freespace -= ARENA_HEADER_SIZE;
 638     return freespace;
 639 }
 640
 641
 642 /***********************************************************************
 643  *           LOCAL_Compact
 644  */
 645 WORD LOCAL_Compact( HANDLE16 ds, UINT16 minfree, UINT16 flags )
 646 {
 647     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 648     LOCALHEAPINFO *pInfo;
 649     LOCALARENA *pArena, *pMoveArena, *pFinalArena;
 650     WORD arena, movearena, finalarena, table;
 651     WORD count, movesize, size;
 652     WORD freespace;
 653     LOCALHANDLEENTRY *pEntry;
 654
 655     if (!(pInfo = LOCAL_GetHeap( ds )))
 656     {
 657         WARN(local, "Local heap not found\n" );
 658         LOCAL_PrintHeap(ds);
 659         return 0;
 660     }
 661     TRACE(local, "ds = %04x, minfree = %04x, flags = %04x\n",
 662                  ds, minfree, flags);
 663     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 664     if(freespace >= minfree || (flags & LMEM_NOCOMPACT))
 665     {
 666         TRACE(local, "Returning %04x.\n", freespace);
 667         return freespace;
 668     }
 669     TRACE(local, "Compacting heap %04x.\n", ds);
 670     table = pInfo->htable;
 671     while(table)
 672     {
 673         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 674         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 675         {
 676             if((pEntry->lock == 0) && (pEntry->flags != (LMEM_DISCARDED >> 8)))
 677             {
 678                 /* OK we can move this one if we want */
 679                 TRACE(local, "handle %04x (block %04x) can be moved.\n",
 680                              (WORD)((char *)pEntry - ptr), pEntry->addr);
 681                 movearena = ARENA_HEADER(pEntry->addr);
 682                 pMoveArena = ARENA_PTR(ptr, movearena);
 683                 movesize = pMoveArena->next - movearena;
 684                 arena = pInfo->first;
 685                 pArena = ARENA_PTR(ptr, arena);
 686                 size = 0xffff;
 687                 finalarena = 0;
 688                 /* Try to find the smallest arena that will do, */
 689                 /* which is below us in memory */
 690                 for(;;)
 691                 {
 692                     arena = pArena->free_next;
 693                     pArena = ARENA_PTR(ptr, arena);
 694                     if(arena >= movearena)
 695                         break;
 696                     if(arena == pArena->free_next)
 697                         break;
 698                     if((pArena->size >= movesize) && (pArena->size < size))
 699                     {
 700                         size = pArena->size;
 701                         finalarena = arena;
 702                     }
 703                 }
 704                 if (finalarena) /* Actually got somewhere to move */
 705                 {
 706                     TRACE(local, "Moving it to %04x.\n", finalarena);
 707                     pFinalArena = ARENA_PTR(ptr, finalarena);
 708                     size = pFinalArena->size;
 709                     LOCAL_RemoveFreeBlock(ptr, finalarena);
 710                     LOCAL_ShrinkArena( ds, finalarena, movesize );
 711                     /* Copy the arena to it's new location */
 712                     memcpy((char *)pFinalArena + ARENA_HEADER_SIZE,
 713                            (char *)pMoveArena + ARENA_HEADER_SIZE,
 714                            movesize - ARENA_HEADER_SIZE );
 715                     /* Free the old location */
 716                     LOCAL_FreeArena(ds, movearena);
 717                     /* Update handle table entry */
 718                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 719                 }
 720                 else if((ARENA_PTR(ptr, pMoveArena->prev & ~3)->prev & 3)
 721                                == LOCAL_ARENA_FREE)
 722                 {
 723                     /* Previous arena is free (but < movesize)  */
 724                     /* so we can 'slide' movearena down into it */
 725                     finalarena = pMoveArena->prev & ~3;
 726                     LOCAL_GrowArenaDownward( ds, movearena, movesize );
 727                     /* Update handle table entry */
 728                     pEntry->addr = finalarena + ARENA_HEADER_SIZE + sizeof(HLOCAL16) ;
 729                 }
 730             }
 731         }
 732         table = *(WORD *)pEntry;
 733     }
 734     freespace = LOCAL_GetFreeSpace(ds, minfree ? 0 : 1);
 735     if(freespace >= minfree || (flags & LMEM_NODISCARD))
 736     {
 737         TRACE(local, "Returning %04x.\n", freespace);
 738         return freespace;
 739     }
 740
 741     table = pInfo->htable;
 742     while(table)
 743     {
 744         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 745         for(count = *(WORD *)(ptr + table); count > 0; count--, pEntry++)
 746         {
 747             if(pEntry->addr && pEntry->lock == 0 &&
 748              (pEntry->flags & (LMEM_DISCARDABLE >> 8)))
 749             {
 750                 TRACE(local, "Discarding handle %04x (block %04x).\n",
 751                               (char *)pEntry - ptr, pEntry->addr);
 752                 LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
 753                 pEntry->addr = 0;
 754                 pEntry->flags = (LMEM_DISCARDED >> 8);
 755                 /* Call localnotify proc */
 756             }
 757         }
 758         table = *(WORD *)pEntry;
 759     }
 760     return LOCAL_Compact(ds, 0xffff, LMEM_NODISCARD);
 761 }
 762
 763
 764 /***********************************************************************
 765  *           LOCAL_FindFreeBlock
 766  */
 767 static HLOCAL16 LOCAL_FindFreeBlock( HANDLE16 ds, WORD size )
 768 {
 769     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 770     LOCALHEAPINFO *pInfo;
 771     LOCALARENA *pArena;
 772     WORD arena;
 773
 774     if (!(pInfo = LOCAL_GetHeap( ds )))
 775     {
 776         WARN(local, "Local heap not found\n" );
 777         LOCAL_PrintHeap(ds);
 778         return 0;
 779     }
 780
 781     arena = pInfo->first;
 782     pArena = ARENA_PTR( ptr, arena );
 783     for (;;) {
 784         arena = pArena->free_next;
 785         pArena = ARENA_PTR( ptr, arena );
 786         if (arena == pArena->free_next) break;
 787         if (pArena->size >= size) return arena;
 788     }
 789     WARN(local, "not enough space\n" );
 790     LOCAL_PrintHeap(ds);
 791     return 0;
 792 }
 793
 794 /***********************************************************************
 795  *           LOCAL_GetBlock
 796  * The segment may get moved around in this function, so all callers
 797  * should reset their pointer variables.
 798  */
 799 static HLOCAL16 LOCAL_GetBlock( HANDLE16 ds, WORD size, WORD flags )
 800 {
 801     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 802     LOCALHEAPINFO *pInfo;
 803     LOCALARENA *pArena;
 804     WORD arena;
 805
 806     if (!(pInfo = LOCAL_GetHeap( ds )))
 807     {
 808         WARN(local, "Local heap not found\n");
 809         LOCAL_PrintHeap(ds);
 810         return 0;
 811     }
 812
 813     size += ARENA_HEADER_SIZE;
 814     size = LALIGN( MAX( size, sizeof(LOCALARENA) ) );
 815
 816       /* Find a suitable free block */
 817     arena = LOCAL_FindFreeBlock( ds, size );
 818     if (arena == 0) {
 819         /* no space: try to make some */
 820         LOCAL_Compact( ds, size, flags );
 821         arena = LOCAL_FindFreeBlock( ds, size );
 822     }
 823     if (arena == 0) {
 824         /* still no space: try to grow the segment */
 825         LOCAL_GrowHeap( ds );
 826         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 827         pInfo = LOCAL_GetHeap( ds );
 828         arena = LOCAL_FindFreeBlock( ds, size );
 829     }
 830     if (arena == 0) {
 831         if (ds == GDI_HeapSel) {
 832             WARN(local, "not enough space in GDI local heap "
 833                          "(%04x) for %d bytes\n", ds, size );
 834         } else if (ds == USER_HeapSel) {
 835             WARN(local, "not enough space in USER local heap "
 836                          "(%04x) for %d bytes\n", ds, size );
 837         } else {
 838             WARN(local, "not enough space in local heap "
 839                          "%04x for %d bytes\n", ds, size );
 840         }
 841         return 0;
 842     }
 843
 844       /* Make a block out of the free arena */
 845     pArena = ARENA_PTR( ptr, arena );
 846     TRACE(local, "LOCAL_GetBlock size = %04x, arena %04x size %04x\n",
 847                   size, arena, pArena->size );
 848     LOCAL_RemoveFreeBlock( ptr, arena );
 849     LOCAL_ShrinkArena( ds, arena, size );
 850
 851     if (flags & LMEM_ZEROINIT)
 852         memset((char *)pArena + ARENA_HEADER_SIZE, 0, size-ARENA_HEADER_SIZE);
 853     return arena + ARENA_HEADER_SIZE;
 854 }
 855
 856
 857 /***********************************************************************
 858  *           LOCAL_NewHTable
 859  */
 860 static BOOL16 LOCAL_NewHTable( HANDLE16 ds )
 861 {
 862     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 863     LOCALHEAPINFO *pInfo;
 864     LOCALHANDLEENTRY *pEntry;
 865     HLOCAL16 handle;
 866     int i;
 867
 868     TRACE(local, "Local_NewHTable\n" );
 869     if (!(pInfo = LOCAL_GetHeap( ds )))
 870     {
 871         WARN(local, "Local heap not found\n");
 872         LOCAL_PrintHeap(ds);
 873         return FALSE;
 874     }
 875
 876     if (!(handle = LOCAL_GetBlock( ds, pInfo->hdelta * sizeof(LOCALHANDLEENTRY)
 877                                    + 2 * sizeof(WORD), LMEM_FIXED )))
 878         return FALSE;
 879     if (!(ptr = PTR_SEG_OFF_TO_LIN( ds, 0 )))
 880         WARN(local, "ptr == NULL after GetBlock.\n");
 881     if (!(pInfo = LOCAL_GetHeap( ds )))
 882         WARN(local,"pInfo == NULL after GetBlock.\n");
 883
 884     /* Fill the entry table */
 885
 886     *(WORD *)(ptr + handle) = pInfo->hdelta;
 887     pEntry = (LOCALHANDLEENTRY *)(ptr + handle + sizeof(WORD));
 888     for (i = pInfo->hdelta; i > 0; i--, pEntry++) {
 889         pEntry->lock = pEntry->flags = 0xff;
 890         pEntry->addr = 0;
 891     }
 892     *(WORD *)pEntry = pInfo->htable;
 893     pInfo->htable = handle;
 894     return TRUE;
 895 }
 896
 897
 898 /***********************************************************************
 899  *           LOCAL_GetNewHandleEntry
 900  */
 901 static HLOCAL16 LOCAL_GetNewHandleEntry( HANDLE16 ds )
 902 {
 903     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 904     LOCALHEAPINFO *pInfo;
 905     LOCALHANDLEENTRY *pEntry = NULL;
 906     WORD table;
 907
 908     if (!(pInfo = LOCAL_GetHeap( ds )))
 909     {
 910         WARN(local, "Local heap not found\n");
 911         LOCAL_PrintHeap(ds);
 912         return 0;
 913     }
 914
 915     /* Find a free slot in existing tables */
 916
 917     table = pInfo->htable;
 918     while (table)
 919     {
 920         WORD count = *(WORD *)(ptr + table);
 921         pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 922         for (; count > 0; count--, pEntry++)
 923             if (pEntry->lock == 0xff) break;
 924         if (count) break;
 925         table = *(WORD *)pEntry;
 926     }
 927
 928     if (!table)  /* We need to create a new table */
 929     {
 930         if (!LOCAL_NewHTable( ds )) return 0;
 931         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 932         pInfo = LOCAL_GetHeap( ds );
 933         pEntry = (LOCALHANDLEENTRY *)(ptr + pInfo->htable + sizeof(WORD));
 934     }
 935
 936     /* Now allocate this entry */
 937
 938     pEntry->lock = 0;
 939     pEntry->flags = 0;
 940     TRACE(local, "(%04x): %04x\n",
 941                    ds, ((char *)pEntry - ptr) );
 942     return (HLOCAL16)((char *)pEntry - ptr);
 943 }
 944
 945
 946 /***********************************************************************
 947  *           LOCAL_FreeHandleEntry
 948  *
 949  * Free a handle table entry.
 950  */
 951 static void LOCAL_FreeHandleEntry( HANDLE16 ds, HLOCAL16 handle )
 952 {
 953     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
 954     LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
 955     LOCALHEAPINFO *pInfo;
 956     WORD *pTable;
 957     WORD table, count, i;
 958
 959     if (!(pInfo = LOCAL_GetHeap( ds ))) return;
 960
 961     /* Find the table where this handle comes from */
 962
 963     pTable = &pInfo->htable;
 964     while (*pTable)
 965     {
 966         WORD size = (*(WORD *)(ptr + *pTable)) * sizeof(LOCALHANDLEENTRY);
 967         if ((handle >= *pTable + sizeof(WORD)) &&
 968             (handle < *pTable + sizeof(WORD) + size)) break;  /* Found it */
 969         pTable = (WORD *)(ptr + *pTable + sizeof(WORD) + size);
 970     }
 971     if (!*pTable)
 972     {
 973         WARN(local, "Invalid entry %04x\n", handle);
 974         LOCAL_PrintHeap( ds );
 975         return;
 976     }
 977
 978     /* Make the entry free */
 979
 980     pEntry->addr = 0;  /* just in case */
 981     pEntry->lock = 0xff;
 982     pEntry->flags = 0xff;
 983     /* Now check if all entries in this table are free */
 984
 985     table = *pTable;
 986     pEntry = (LOCALHANDLEENTRY *)(ptr + table + sizeof(WORD));
 987     count = *(WORD *)(ptr + table);
 988     for (i = count; i > 0; i--, pEntry++) if (pEntry->lock != 0xff) return;
 989
 990     /* Remove the table from the linked list and free it */
 991
 992     TRACE(local, "(%04x): freeing table %04x\n",
 993                    ds, table);
 994     *pTable = *(WORD *)pEntry;
 995     LOCAL_FreeArena( ds, ARENA_HEADER( table ) );
 996 }
 997
 998
 999 /***********************************************************************
1000  *           LOCAL_Free
1001  *
1002  * Implementation of LocalFree().
1003  */
1004 HLOCAL16 LOCAL_Free( HANDLE16 ds, HLOCAL16 handle )
1005 {
1006     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1007
1008     TRACE(local, "%04x ds=%04x\n", handle, ds );
1009
1010     if (!handle) { WARN(local, "Handle is 0.\n" ); return 0; }
1011     if (HANDLE_FIXED( handle ))
1012     {
1013         if (!LOCAL_FreeArena( ds, ARENA_HEADER( handle ) )) return 0;  /* OK */
1014         else return handle;  /* couldn't free it */
1015     }
1016     else
1017     {
1018         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1019         if (pEntry->flags != (LMEM_DISCARDED >> 8))
1020         {
1021             TRACE(local, "real block at %04x\n",
1022                            pEntry->addr );
1023             if (LOCAL_FreeArena( ds, ARENA_HEADER(pEntry->addr) ))
1024                 return handle; /* couldn't free it */
1025         }
1026         LOCAL_FreeHandleEntry( ds, handle );
1027         return 0;  /* OK */
1028     }
1029 }
1030
1031
1032 /***********************************************************************
1033  *           LOCAL_Alloc
1034  *
1035  * Implementation of LocalAlloc().
1036  *
1037  */
1038 HLOCAL16 LOCAL_Alloc( HANDLE16 ds, WORD flags, WORD size )
1039 {
1040     char *ptr;
1041     HLOCAL16 handle;
1042
1043     TRACE(local, "%04x %d ds=%04x\n", flags, size, ds );
1044
1045     if(size > 0 && size <= 4) size = 5;
1046     if (flags & LMEM_MOVEABLE)
1047     {
1048         LOCALHANDLEENTRY *plhe;
1049         HLOCAL16 hmem;
1050
1051         if(size)
1052         {
1053             if (!(hmem = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags )))
1054                 return 0;
1055         }
1056         else /* We just need to allocate a discarded handle */
1057             hmem = 0;
1058         if (!(handle = LOCAL_GetNewHandleEntry( ds )))
1059         {
1060             WARN(local, "Couldn't get handle.\n");
1061             if(hmem)
1062                 LOCAL_FreeArena( ds, ARENA_HEADER(hmem) );
1063             return 0;
1064         }
1065         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1066         plhe = (LOCALHANDLEENTRY *)(ptr + handle);
1067         plhe->lock = 0;
1068         if(hmem)
1069         {
1070             plhe->addr = hmem + sizeof(HLOCAL16);
1071             plhe->flags = (BYTE)((flags & 0x0f00) >> 8);
1072             *(HLOCAL16 *)(ptr + hmem) = handle;
1073         }
1074         else
1075         {
1076             plhe->addr = 0;
1077             plhe->flags = LMEM_DISCARDED >> 8;
1078         }
1079     }
1080     else /* FIXED */
1081     {
1082         if(!size)
1083             return 0;
1084         handle = LOCAL_GetBlock( ds, size, flags );
1085     }
1086     return handle;
1087 }
1088
1089
1090 /***********************************************************************
1091  *           LOCAL_ReAlloc
1092  *
1093  * Implementation of LocalReAlloc().
1094  */
1095 HLOCAL16 LOCAL_ReAlloc( HANDLE16 ds, HLOCAL16 handle, WORD size, WORD flags )
1096 {
1097     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1098     LOCALHEAPINFO *pInfo;
1099     LOCALARENA *pArena, *pNext;
1100     LOCALHANDLEENTRY *pEntry = NULL;
1101     WORD arena, oldsize;
1102     HLOCAL16 hmem, blockhandle;
1103     LONG nextarena;
1104
1105     if (!handle) return 0;
1106     if(HANDLE_MOVEABLE(handle) &&
1107      ((LOCALHANDLEENTRY *)(ptr + handle))->lock == 0xff) /* An unused handle */
1108         return 0;
1109
1110     TRACE(local, "%04x %d %04x ds=%04x\n",
1111                    handle, size, flags, ds );
1112     if (!(pInfo = LOCAL_GetHeap( ds ))) return 0;
1113
1114     if (HANDLE_FIXED( handle ))
1115         blockhandle = handle;
1116     else
1117     {
1118         pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1119         if(pEntry->flags == (LMEM_DISCARDED >> 8))
1120         {
1121             HLOCAL16 hl;
1122             if(pEntry->addr)
1123                 WARN(local,"Dicarded block has non-zero addr.\n");
1124             TRACE(local, "ReAllocating discarded block\n");
1125             if(size <= 4) size = 5;
1126             if (!(hl = LOCAL_GetBlock( ds, size + sizeof(HLOCAL16), flags)))
1127                 return 0;
1128             ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1129             pEntry = (LOCALHANDLEENTRY *) (ptr + handle);
1130             pEntry->addr = hl + sizeof(HLOCAL16);
1131             pEntry->flags = 0;
1132             pEntry->lock = 0;
1133             *(HLOCAL16 *)(ptr + hl) = handle;
1134             return handle;
1135         }
1136         if (((blockhandle = pEntry->addr) & 3) != 2)
1137         {
1138             WARN(local, "(%04x,%04x): invalid handle\n",
1139                      ds, handle );
1140             return 0;
1141         }
1142         if(*((HLOCAL16 *)(ptr + blockhandle) - 1) != handle) {
1143             WARN(local, "Back ptr to handle is invalid\n");
1144             return 0;
1145         }
1146     }
1147
1148     if (flags & LMEM_MODIFY)
1149     {
1150         if (HANDLE_MOVEABLE(handle))
1151         {
1152             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1153             pEntry->flags = (flags & 0x0f00) >> 8;
1154             TRACE(local, "Changing flags to %x.\n", pEntry->flags);
1155         }
1156         return handle;
1157     }
1158
1159     if (!size)
1160     {
1161         if (flags & LMEM_MOVEABLE)
1162         {
1163             if (HANDLE_FIXED(handle))
1164             {
1165                 TRACE(local, "Freeing fixed block.\n");
1166                 return LOCAL_Free( ds, handle );
1167             }
1168             else /* Moveable block */
1169             {
1170                 pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1171                 if (pEntry->lock == 0)
1172                 {
1173                     /* discards moveable blocks */
1174                     TRACE(local,"Discarding block\n");
1175                     LOCAL_FreeArena(ds, ARENA_HEADER(pEntry->addr));
1176                     pEntry->addr = 0;
1177                     pEntry->flags = (LMEM_DISCARDED >> 8);
1178                     return handle;
1179                 }
1180             }
1181             return 0;
1182         }
1183         else if(flags == 0)
1184         {
1185             pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1186             if (pEntry->lock == 0)
1187             {
1188                 /* Frees block */
1189                 return LOCAL_Free( ds, handle );
1190             }
1191         }
1192         return 0;
1193     }
1194
1195     arena = ARENA_HEADER( blockhandle );
1196     TRACE(local, "arena is %04x\n", arena );
1197     pArena = ARENA_PTR( ptr, arena );
1198
1199     if(size <= 4) size = 5;
1200     oldsize = pArena->next - arena - ARENA_HEADER_SIZE;
1201     nextarena = LALIGN(blockhandle + size);
1202
1203       /* Check for size reduction */
1204
1205     if (nextarena <= pArena->next)
1206     {
1207         TRACE(local, "size reduction, making new free block\n");
1208         LOCAL_ShrinkArena(ds, arena, nextarena - arena);
1209         TRACE(local, "returning %04x\n", handle );
1210         return handle;
1211     }
1212
1213       /* Check if the next block is free and large enough */
1214
1215     pNext = ARENA_PTR( ptr, pArena->next );
1216     if (((pNext->prev & 3) == LOCAL_ARENA_FREE) &&
1217         (nextarena <= pNext->next))
1218     {
1219         TRACE(local, "size increase, making new free block\n");
1220         LOCAL_GrowArenaUpward(ds, arena, nextarena - arena);
1221         TRACE(local, "returning %04x\n", handle );
1222         return handle;
1223     }
1224
1225     /* Now we have to allocate a new block, but not if (fixed block or locked
1226        block) and no LMEM_MOVEABLE */
1227
1228     if (!(flags & LMEM_MOVEABLE))
1229     {
1230         if (HANDLE_FIXED(handle))
1231         {
1232             WARN(local, "Needed to move fixed block, but LMEM_MOVEABLE not specified.\n");
1233             return 0;
1234         }
1235         else
1236         {
1237             if(((LOCALHANDLEENTRY *)(ptr + handle))->lock != 0)
1238             {
1239                 WARN(local, "Needed to move locked block, but LMEM_MOVEABLE not specified.\n");
1240                 return 0;
1241             }
1242         }
1243     }
1244     if(HANDLE_MOVEABLE(handle)) size += sizeof(HLOCAL16);
1245     hmem = LOCAL_GetBlock( ds, size, flags );
1246     ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr                             */
1247     if(HANDLE_MOVEABLE(handle))         /* LOCAL_GetBlock might have triggered    */
1248     {                                   /* a compaction, which might in turn have */
1249       blockhandle = pEntry->addr ;      /* moved the very block we are resizing   */
1250       arena = ARENA_HEADER( blockhandle );   /* thus, we reload arena, too        */
1251     }
1252     if (!hmem)
1253     {
1254         /* Remove the block from the heap and try again */
1255         LPSTR buffer = HeapAlloc( GetProcessHeap(), 0, oldsize );
1256         if (!buffer) return 0;
1257         memcpy( buffer, ptr + arena + ARENA_HEADER_SIZE, oldsize );
1258         LOCAL_FreeArena( ds, arena );
1259         if (!(hmem = LOCAL_GetBlock( ds, size, flags )))
1260         {
1261             if (!(hmem = LOCAL_GetBlock( ds, oldsize, flags )))
1262             {
1263                 WARN(local, "Can't restore saved block\n" );
1264                 HeapFree( GetProcessHeap(), 0, buffer );
1265                 return 0;
1266             }
1267             size = oldsize;
1268         }
1269         ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );  /* Reload ptr */
1270         memcpy( ptr + hmem, buffer, oldsize );
1271         HeapFree( GetProcessHeap(), 0, buffer );
1272     }
1273     else
1274     {
1275         memcpy( ptr + hmem, ptr + (arena + ARENA_HEADER_SIZE), oldsize );
1276         LOCAL_FreeArena( ds, arena );
1277     }
1278     if (HANDLE_MOVEABLE( handle ))
1279     {
1280         TRACE(local, "fixing handle\n");
1281         pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1282         pEntry->addr = hmem + sizeof(HLOCAL16);
1283         /* Back ptr should still be correct */
1284         if(*(HLOCAL16 *)(ptr + hmem) != handle)
1285             WARN(local, "back ptr is invalid.\n");
1286         hmem = handle;
1287     }
1288     if (size == oldsize) hmem = 0;  /* Realloc failed */
1289     TRACE(local, "returning %04x\n", hmem );
1290     return hmem;
1291 }
1292
1293
1294 /***********************************************************************
1295  *           LOCAL_InternalLock
1296  */
1297 static HLOCAL16 LOCAL_InternalLock( LPSTR heap, HLOCAL16 handle )
1298 {
1299     HLOCAL16 old_handle = handle;
1300
1301     if (HANDLE_MOVEABLE(handle))
1302     {
1303         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(heap + handle);
1304         if (pEntry->flags == LMEM_DISCARDED) return 0;
1305         if (pEntry->lock < 0xfe) pEntry->lock++;
1306         handle = pEntry->addr;
1307     }
1308     TRACE(local, "%04x returning %04x\n",
1309                    old_handle, handle );
1310     return handle;
1311 }
1312
1313
1314 /***********************************************************************
1315  *           LOCAL_Lock
1316  */
1317 LPSTR LOCAL_Lock( HANDLE16 ds, HLOCAL16 handle )
1318 {
1319     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1320     return handle ? ptr + LOCAL_InternalLock( ptr, handle ) : NULL;
1321 }
1322
1323
1324 /***********************************************************************
1325  *           LOCAL_LockSegptr
1326  */
1327 SEGPTR LOCAL_LockSegptr( HANDLE16 ds, HLOCAL16 handle )
1328 {
1329     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1330     return PTR_SEG_OFF_TO_SEGPTR( ds, LOCAL_InternalLock( ptr, handle ) );
1331 }
1332
1333
1334 /***********************************************************************
1335  *           LOCAL_Unlock
1336  */
1337 BOOL16 LOCAL_Unlock( HANDLE16 ds, HLOCAL16 handle )
1338 {
1339     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1340
1341     TRACE(local, "%04x\n", handle );
1342     if (HANDLE_MOVEABLE(handle))
1343     {
1344         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1345         if (!pEntry->lock || (pEntry->lock == 0xff)) return FALSE;
1346         /* For moveable block, return the new lock count */
1347         /* (see _Windows_Internals_ p. 197) */
1348         return --pEntry->lock;
1349     }
1350     else return FALSE;
1351 }
1352
1353
1354 /***********************************************************************
1355  *           LOCAL_Size
1356  *
1357  * Implementation of LocalSize().
1358  */
1359 WORD LOCAL_Size( HANDLE16 ds, HLOCAL16 handle )
1360 {
1361     char *ptr = PTR_SEG_OFF_TO_LIN( CURRENT_DS, 0 );
1362     LOCALARENA *pArena;
1363
1364     TRACE(local, "%04x ds=%04x\n", handle, ds );
1365
1366     if (HANDLE_MOVEABLE( handle )) handle = *(WORD *)(ptr + handle);
1367     if (!handle) return 0;
1368     pArena = ARENA_PTR( ptr, ARENA_HEADER(handle) );
1369     return pArena->next - handle;
1370 }
1371
1372
1373 /***********************************************************************
1374  *           LOCAL_Flags
1375  *
1376  * Implementation of LocalFlags().
1377  */
1378 WORD LOCAL_Flags( HANDLE16 ds, HLOCAL16 handle )
1379 {
1380     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1381
1382     if (HANDLE_MOVEABLE(handle))
1383     {
1384         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY *)(ptr + handle);
1385         TRACE(local, "(%04x,%04x): returning %04x\n",
1386                        ds, handle, pEntry->lock | (pEntry->flags << 8) );
1387         return pEntry->lock | (pEntry->flags << 8);
1388     }
1389     else
1390     {
1391         TRACE(local, "(%04x,%04x): returning 0\n",
1392                        ds, handle );
1393         return 0;
1394     }
1395 }
1396
1397
1398 /***********************************************************************
1399  *           LOCAL_HeapSize
1400  *
1401  * Implementation of LocalHeapSize().
1402  */
1403 WORD LOCAL_HeapSize( HANDLE16 ds )
1404 {
1405     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1406     if (!pInfo) return 0;
1407     return pInfo->last - pInfo->first;
1408 }
1409
1410
1411 /***********************************************************************
1412  *           LOCAL_CountFree
1413  *
1414  * Implementation of LocalCountFree().
1415  */
1416 WORD LOCAL_CountFree( HANDLE16 ds )
1417 {
1418     WORD arena, total;
1419     LOCALARENA *pArena;
1420     LOCALHEAPINFO *pInfo;
1421     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1422
1423     if (!(pInfo = LOCAL_GetHeap( ds )))
1424     {
1425         WARN(local, "(%04x): Local heap not found\n", ds );
1426         LOCAL_PrintHeap( ds );
1427         return 0;
1428     }
1429
1430     total = 0;
1431     arena = pInfo->first;
1432     pArena = ARENA_PTR( ptr, arena );
1433     for (;;)
1434     {
1435         arena = pArena->free_next;
1436         pArena = ARENA_PTR( ptr, arena );
1437         if (arena == pArena->free_next) break;
1438         total += pArena->size;
1439     }
1440     TRACE(local, "(%04x): returning %d\n", ds, total);
1441     return total;
1442 }
1443
1444
1445 /***********************************************************************
1446  *           LOCAL_Handle
1447  *
1448  * Implementation of LocalHandle().
1449  */
1450 HLOCAL16 LOCAL_Handle( HANDLE16 ds, WORD addr )
1451 {
1452     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1453     LOCALHEAPINFO *pInfo;
1454     WORD table;
1455
1456     if (!(pInfo = LOCAL_GetHeap( ds )))
1457     {
1458         WARN(local, "(%04x): Local heap not found\n", ds );
1459         LOCAL_PrintHeap( ds );
1460         return 0;
1461     }
1462
1463     /* Find the address in the entry tables */
1464
1465     table = pInfo->htable;
1466     while (table)
1467     {
1468         WORD count = *(WORD *)(ptr + table);
1469         LOCALHANDLEENTRY *pEntry = (LOCALHANDLEENTRY*)(ptr+table+sizeof(WORD));
1470         for (; count > 0; count--, pEntry++)
1471             if (pEntry->addr == addr) return (HLOCAL16)((char *)pEntry - ptr);
1472         table = *(WORD *)pEntry;
1473     }
1474
1475     return (HLOCAL16)addr;  /* Fixed block handle is addr */
1476 }
1477
1478
1479 /***********************************************************************
1480  *           LocalAlloc16   (KERNEL.5)
1481  */
1482 HLOCAL16 WINAPI LocalAlloc16( UINT16 flags, WORD size )
1483 {
1484     return LOCAL_Alloc( CURRENT_DS, flags, size );
1485 }
1486
1487
1488 /***********************************************************************
1489  *           LocalReAlloc16   (KERNEL.6)
1490  */
1491 HLOCAL16 WINAPI LocalReAlloc16( HLOCAL16 handle, WORD size, UINT16 flags )
1492 {
1493     return LOCAL_ReAlloc( CURRENT_DS, handle, size, flags );
1494 }
1495
1496
1497 /***********************************************************************
1498  *           LocalFree16   (KERNEL.7)
1499  */
1500 HLOCAL16 WINAPI LocalFree16( HLOCAL16 handle )
1501 {
1502     return LOCAL_Free( CURRENT_DS, handle );
1503 }
1504
1505
1506 /***********************************************************************
1507  *           LocalLock16   (KERNEL.8)
1508  *
1509  * Note: only the offset part of the pointer is returned by the relay code.
1510  */
1511 SEGPTR WINAPI LocalLock16( HLOCAL16 handle )
1512 {
1513     return LOCAL_LockSegptr( CURRENT_DS, handle );
1514 }
1515
1516
1517 /***********************************************************************
1518  *           LocalUnlock16   (KERNEL.9)
1519  */
1520 BOOL16 WINAPI LocalUnlock16( HLOCAL16 handle )
1521 {
1522     return LOCAL_Unlock( CURRENT_DS, handle );
1523 }
1524
1525
1526 /***********************************************************************
1527  *           LocalSize16   (KERNEL.10)
1528  */
1529 UINT16 WINAPI LocalSize16( HLOCAL16 handle )
1530 {
1531     return LOCAL_Size( CURRENT_DS, handle );
1532 }
1533
1534
1535 /***********************************************************************
1536  *           LocalHandle16   (KERNEL.11)
1537  */
1538 HLOCAL16 WINAPI LocalHandle16( WORD addr )
1539 {
1540     return LOCAL_Handle( CURRENT_DS, addr );
1541 }
1542
1543
1544 /***********************************************************************
1545  *           LocalFlags16   (KERNEL.12)
1546  */
1547 UINT16 WINAPI LocalFlags16( HLOCAL16 handle )
1548 {
1549     return LOCAL_Flags( CURRENT_DS, handle );
1550 }
1551
1552
1553 /***********************************************************************
1554  *           LocalCompact16   (KERNEL.13)
1555  */
1556 UINT16 WINAPI LocalCompact16( UINT16 minfree )
1557 {
1558     TRACE(local, "%04x\n", minfree );
1559     return LOCAL_Compact( CURRENT_DS, minfree, 0 );
1560 }
1561
1562
1563 /***********************************************************************
1564  *           LocalNotify   (KERNEL.14)
1565  */
1566 FARPROC16 WINAPI LocalNotify( FARPROC16 func )
1567 {
1568     LOCALHEAPINFO *pInfo;
1569     FARPROC16 oldNotify;
1570     HANDLE16 ds = CURRENT_DS;
1571
1572     if (!(pInfo = LOCAL_GetHeap( ds )))
1573     {
1574         ERR(local, "(%04x): Local heap not found\n", ds );
1575         LOCAL_PrintHeap( ds );
1576         return 0;
1577     }
1578     TRACE(local, "(%04x): %08lx\n", ds, (DWORD)func );
1579     FIXME(local, "Half implemented\n");
1580     oldNotify = pInfo->notify;
1581     pInfo->notify = func;
1582     return oldNotify;
1583 }
1584
1585
1586 /***********************************************************************
1587  *           LocalShrink16   (KERNEL.121)
1588  */
1589 UINT16 WINAPI LocalShrink16( HGLOBAL16 handle, UINT16 newsize )
1590 {
1591     TRACE(local, "%04x %04x\n", handle, newsize );
1592     return 0;
1593 }
1594
1595
1596 /***********************************************************************
1597  *           GetHeapSpaces   (KERNEL.138)
1598  */
1599 DWORD WINAPI GetHeapSpaces( HMODULE16 module )
1600 {
1601     NE_MODULE *pModule;
1602     WORD ds;
1603
1604     if (!(pModule = NE_GetPtr( module ))) return 0;
1605     ds = (NE_SEG_TABLE( pModule ) + pModule->dgroup - 1)->selector;
1606     return MAKELONG( LOCAL_CountFree( ds ), LOCAL_HeapSize( ds ) );
1607 }
1608
1609
1610 /***********************************************************************
1611  *           LocalCountFree   (KERNEL.161)
1612  */
1613 WORD WINAPI LocalCountFree(void)
1614 {
1615     return LOCAL_CountFree( CURRENT_DS );
1616 }
1617
1618
1619 /***********************************************************************
1620  *           LocalHeapSize   (KERNEL.162)
1621  */
1622 WORD WINAPI LocalHeapSize(void)
1623 {
1624     TRACE(local, "(void)\n" );
1625     return LOCAL_HeapSize( CURRENT_DS );
1626 }
1627
1628
1629 /***********************************************************************
1630  *           LocalHandleDelta   (KERNEL.310)
1631  */
1632 WORD WINAPI LocalHandleDelta( WORD delta )
1633 {
1634     LOCALHEAPINFO *pInfo;
1635
1636     if (!(pInfo = LOCAL_GetHeap( CURRENT_DS )))
1637     {
1638         ERR(local, "Local heap not found\n");
1639         LOCAL_PrintHeap( CURRENT_DS );
1640         return 0;
1641     }
1642     if (delta) pInfo->hdelta = delta;
1643     TRACE(local, "returning %04x\n", pInfo->hdelta);
1644     return pInfo->hdelta;
1645 }
1646
1647
1648 /***********************************************************************
1649  *           LocalInfo   (TOOLHELP.56)
1650  */
1651 BOOL16 WINAPI LocalInfo( LOCALINFO *pLocalInfo, HGLOBAL16 handle )
1652 {
1653     LOCALHEAPINFO *pInfo = LOCAL_GetHeap(SELECTOROF(WIN16_GlobalLock16(handle)));
1654     if (!pInfo) return FALSE;
1655     pLocalInfo->wcItems = pInfo->items;
1656     return TRUE;
1657 }
1658
1659
1660 /***********************************************************************
1661  *           LocalFirst   (TOOLHELP.57)
1662  */
1663 BOOL16 WINAPI LocalFirst( LOCALENTRY *pLocalEntry, HGLOBAL16 handle )
1664 {
1665     WORD ds = GlobalHandleToSel( handle );
1666     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1667     LOCALHEAPINFO *pInfo = LOCAL_GetHeap( ds );
1668     if (!pInfo) return FALSE;
1669
1670     pLocalEntry->hHandle   = pInfo->first + ARENA_HEADER_SIZE;
1671     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1672     pLocalEntry->wFlags    = LF_FIXED;
1673     pLocalEntry->wcLock    = 0;
1674     pLocalEntry->wType     = LT_NORMAL;
1675     pLocalEntry->hHeap     = handle;
1676     pLocalEntry->wHeapType = NORMAL_HEAP;
1677     pLocalEntry->wNext     = ARENA_PTR(ptr,pInfo->first)->next;
1678     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1679     return TRUE;
1680 }
1681
1682
1683 /***********************************************************************
1684  *           LocalNext   (TOOLHELP.58)
1685  */
1686 BOOL16 WINAPI LocalNext( LOCALENTRY *pLocalEntry )
1687 {
1688     WORD ds = GlobalHandleToSel( pLocalEntry->hHeap );
1689     char *ptr = PTR_SEG_OFF_TO_LIN( ds, 0 );
1690     LOCALARENA *pArena;
1691
1692     if (!LOCAL_GetHeap( ds )) return FALSE;
1693     if (!pLocalEntry->wNext) return FALSE;
1694     pArena = ARENA_PTR( ptr, pLocalEntry->wNext );
1695
1696     pLocalEntry->hHandle   = pLocalEntry->wNext + ARENA_HEADER_SIZE;
1697     pLocalEntry->wAddress  = pLocalEntry->hHandle;
1698     pLocalEntry->wFlags    = (pArena->prev & 3) + 1;
1699     pLocalEntry->wcLock    = 0;
1700     pLocalEntry->wType     = LT_NORMAL;
1701     if (pArena->next != pLocalEntry->wNext)  /* last one? */
1702         pLocalEntry->wNext = pArena->next;
1703     else
1704         pLocalEntry->wNext = 0;
1705     pLocalEntry->wSize     = pLocalEntry->wNext - pLocalEntry->hHandle;
1706     return TRUE;
1707 }
1708
1709
1710 /***********************************************************************
1711  *           LocalAlloc32   (KERNEL32.371)
1712  * RETURNS
1713  *      Handle: Success
1714  *      NULL: Failure
1715  */
1716 HLOCAL32 WINAPI LocalAlloc32(
1717                 UINT32 flags, /* [in] Allocation attributes */
1718                 DWORD size    /* [in] Number of bytes to allocate */
1719 ) {
1720     return (HLOCAL32)GlobalAlloc32( flags, size );
1721 }
1722
1723
1724 /***********************************************************************
1725  *           LocalCompact32   (KERNEL32.372)
1726  */
1727 UINT32 WINAPI LocalCompact32( UINT32 minfree )
1728 {
1729     return 0;  /* LocalCompact does nothing in Win32 */
1730 }
1731
1732
1733 /***********************************************************************
1734  *           LocalFlags32   (KERNEL32.374)
1735  * RETURNS
1736  *      Value specifying allocation flags and lock count.
1737  *      LMEM_INVALID_HANDLE: Failure
1738  */
1739 UINT32 WINAPI LocalFlags32(
1740               HLOCAL32 handle /* [in] Handle of memory object */
1741 ) {
1742     return GlobalFlags32( (HGLOBAL32)handle );
1743 }
1744
1745
1746 /***********************************************************************
1747  *           LocalFree32   (KERNEL32.375)
1748  * RETURNS
1749  *      NULL: Success
1750  *      Handle: Failure
1751  */
1752 HLOCAL32 WINAPI LocalFree32(
1753                 HLOCAL32 handle /* [in] Handle of memory object */
1754 ) {
1755     return (HLOCAL32)GlobalFree32( (HGLOBAL32)handle );
1756 }
1757
1758
1759 /***********************************************************************
1760  *           LocalHandle32   (KERNEL32.376)
1761  * RETURNS
1762  *      Handle: Success
1763  *      NULL: Failure
1764  */
1765 HLOCAL32 WINAPI LocalHandle32(
1766                 LPCVOID ptr /* [in] Address of local memory object */
1767 ) {
1768     return (HLOCAL32)GlobalHandle32( ptr );
1769 }
1770
1771
1772 /***********************************************************************
1773  *           LocalLock32   (KERNEL32.377)
1774  * Locks a local memory object and returns pointer to the first byte
1775  * of the memory block.
1776  *
1777  * RETURNS
1778  *      Pointer: Success
1779  *      NULL: Failure
1780  */
1781 LPVOID WINAPI LocalLock32(
1782               HLOCAL32 handle /* [in] Address of local memory object */
1783 ) {
1784     return GlobalLock32( (HGLOBAL32)handle );
1785 }
1786
1787
1788 /***********************************************************************
1789  *           LocalReAlloc32   (KERNEL32.378)
1790  * RETURNS
1791  *      Handle: Success
1792  *      NULL: Failure
1793  */
1794 HLOCAL32 WINAPI LocalReAlloc32(
1795                 HLOCAL32 handle, /* [in] Handle of memory object */
1796                 DWORD size,      /* [in] New size of block */
1797                 UINT32 flags     /* [in] How to reallocate object */
1798 ) {
1799     return (HLOCAL32)GlobalReAlloc32( (HGLOBAL32)handle, size, flags );
1800 }
1801
1802
1803 /***********************************************************************
1804  *           LocalShrink32   (KERNEL32.379)
1805  */
1806 UINT32 WINAPI LocalShrink32( HGLOBAL32 handle, UINT32 newsize )
1807 {
1808     return 0;  /* LocalShrink does nothing in Win32 */
1809 }
1810
1811
1812 /***********************************************************************
1813  *           LocalSize32   (KERNEL32.380)
1814  * RETURNS
1815  *      Size: Success
1816  *      0: Failure
1817  */
1818 UINT32 WINAPI LocalSize32(
1819               HLOCAL32 handle /* [in] Handle of memory object */
1820 ) {
1821     return GlobalSize32( (HGLOBAL32)handle );
1822 }
1823
1824
1825 /***********************************************************************
1826  *           LocalUnlock32   (KERNEL32.381)
1827  * RETURNS
1828  *      TRUE: Object is still locked
1829  *      FALSE: Object is unlocked
1830  */
1831 BOOL32 WINAPI LocalUnlock32(
1832               HLOCAL32 handle /* [in] Handle of memory object */
1833 ) {
1834     return GlobalUnlock32( (HGLOBAL32)handle );
1835 }