2 * msvcrt.dll heap functions
4 * Copyright 2000 Jon Griffiths
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 * Note: Win32 heap operations are MT safe. We only lock the new
21 * handler and non atomic heap operations
26 #include "wine/debug.h"
28 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
31 #define LOCK_HEAP _mlock( _HEAP_LOCK )
32 #define UNLOCK_HEAP _munlock( _HEAP_LOCK )
35 #define SAVED_PTR(x) ((void *)((DWORD_PTR)((char *)x - sizeof(void *)) & \
36 ~(sizeof(void *) - 1)))
37 #define ALIGN_PTR(ptr, alignment, offset) ((void *) \
38 ((((DWORD_PTR)((char *)ptr + alignment + sizeof(void *) + offset)) & \
39 ~(alignment - 1)) - offset))
42 typedef int (CDECL *MSVCRT_new_handler_func)(MSVCRT_size_t size);
44 static MSVCRT_new_handler_func MSVCRT_new_handler;
45 static int MSVCRT_new_mode;
47 /* FIXME - According to documentation it should be 8*1024, at runtime it returns 16 */
48 static unsigned int MSVCRT_amblksiz = 16;
49 /* FIXME - According to documentation it should be 480 bytes, at runtime default is 0 */
50 static MSVCRT_size_t MSVCRT_sbh_threshold = 0;
52 /*********************************************************************
53 * ??2@YAPAXI@Z (MSVCRT.@)
55 void* CDECL MSVCRT_operator_new(MSVCRT_size_t size)
62 retval = HeapAlloc(GetProcessHeap(), 0, size);
65 TRACE("(%ld) returning %p\n", size, retval);
70 if(MSVCRT_new_handler)
71 freed = (*MSVCRT_new_handler)(size);
77 TRACE("(%ld) out of memory\n", size);
82 /*********************************************************************
83 * ??2@YAPAXIHPBDH@Z (MSVCRT.@)
85 void* CDECL MSVCRT_operator_new_dbg(MSVCRT_size_t size, int type, const char *file, int line)
87 return MSVCRT_operator_new( size );
91 /*********************************************************************
92 * ??3@YAXPAX@Z (MSVCRT.@)
94 void CDECL MSVCRT_operator_delete(void *mem)
97 HeapFree(GetProcessHeap(), 0, mem);
101 /*********************************************************************
102 * ?_query_new_handler@@YAP6AHI@ZXZ (MSVCRT.@)
104 MSVCRT_new_handler_func CDECL MSVCRT__query_new_handler(void)
106 return MSVCRT_new_handler;
110 /*********************************************************************
111 * ?_query_new_mode@@YAHXZ (MSVCRT.@)
113 int CDECL MSVCRT__query_new_mode(void)
115 return MSVCRT_new_mode;
118 /*********************************************************************
119 * ?_set_new_handler@@YAP6AHI@ZP6AHI@Z@Z (MSVCRT.@)
121 MSVCRT_new_handler_func CDECL MSVCRT__set_new_handler(MSVCRT_new_handler_func func)
123 MSVCRT_new_handler_func old_handler;
125 old_handler = MSVCRT_new_handler;
126 MSVCRT_new_handler = func;
131 /*********************************************************************
132 * ?set_new_handler@@YAP6AXXZP6AXXZ@Z (MSVCRT.@)
134 MSVCRT_new_handler_func CDECL MSVCRT_set_new_handler(void *func)
136 TRACE("(%p)\n",func);
137 MSVCRT__set_new_handler(NULL);
141 /*********************************************************************
142 * ?_set_new_mode@@YAHH@Z (MSVCRT.@)
144 int CDECL MSVCRT__set_new_mode(int mode)
148 old_mode = MSVCRT_new_mode;
149 MSVCRT_new_mode = mode;
154 /*********************************************************************
155 * _callnewh (MSVCRT.@)
157 int CDECL _callnewh(MSVCRT_size_t size)
159 if(MSVCRT_new_handler)
160 (*MSVCRT_new_handler)(size);
164 /*********************************************************************
167 void* CDECL _expand(void* mem, MSVCRT_size_t size)
169 return HeapReAlloc(GetProcessHeap(), HEAP_REALLOC_IN_PLACE_ONLY, mem, size);
172 /*********************************************************************
173 * _heapchk (MSVCRT.@)
175 int CDECL _heapchk(void)
177 if (!HeapValidate( GetProcessHeap(), 0, NULL))
179 msvcrt_set_errno(GetLastError());
180 return MSVCRT__HEAPBADNODE;
182 return MSVCRT__HEAPOK;
185 /*********************************************************************
186 * _heapmin (MSVCRT.@)
188 int CDECL _heapmin(void)
190 if (!HeapCompact( GetProcessHeap(), 0 ))
192 if (GetLastError() != ERROR_CALL_NOT_IMPLEMENTED)
193 msvcrt_set_errno(GetLastError());
199 /*********************************************************************
200 * _heapwalk (MSVCRT.@)
202 int CDECL _heapwalk(struct MSVCRT__heapinfo* next)
204 PROCESS_HEAP_ENTRY phe;
207 phe.lpData = next->_pentry;
208 phe.cbData = next->_size;
209 phe.wFlags = next->_useflag == MSVCRT__USEDENTRY ? PROCESS_HEAP_ENTRY_BUSY : 0;
211 if (phe.lpData && phe.wFlags & PROCESS_HEAP_ENTRY_BUSY &&
212 !HeapValidate( GetProcessHeap(), 0, phe.lpData ))
215 msvcrt_set_errno(GetLastError());
216 return MSVCRT__HEAPBADNODE;
221 if (!HeapWalk( GetProcessHeap(), &phe ))
224 if (GetLastError() == ERROR_NO_MORE_ITEMS)
225 return MSVCRT__HEAPEND;
226 msvcrt_set_errno(GetLastError());
228 return MSVCRT__HEAPBADBEGIN;
229 return MSVCRT__HEAPBADNODE;
231 } while (phe.wFlags & (PROCESS_HEAP_REGION|PROCESS_HEAP_UNCOMMITTED_RANGE));
234 next->_pentry = phe.lpData;
235 next->_size = phe.cbData;
236 next->_useflag = phe.wFlags & PROCESS_HEAP_ENTRY_BUSY ? MSVCRT__USEDENTRY : MSVCRT__FREEENTRY;
237 return MSVCRT__HEAPOK;
240 /*********************************************************************
241 * _heapset (MSVCRT.@)
243 int CDECL _heapset(unsigned int value)
246 struct MSVCRT__heapinfo heap;
248 memset( &heap, 0, sizeof(heap) );
250 while ((retval = _heapwalk(&heap)) == MSVCRT__HEAPOK)
252 if (heap._useflag == MSVCRT__FREEENTRY)
253 memset(heap._pentry, value, heap._size);
256 return retval == MSVCRT__HEAPEND? MSVCRT__HEAPOK : retval;
259 /*********************************************************************
260 * _heapadd (MSVCRT.@)
262 int CDECL _heapadd(void* mem, MSVCRT_size_t size)
264 TRACE("(%p,%ld) unsupported in Win32\n", mem,size);
265 *MSVCRT__errno() = MSVCRT_ENOSYS;
269 /*********************************************************************
270 * _heapadd (MSVCRT.@)
272 MSVCRT_intptr_t CDECL _get_heap_handle(void)
274 return (MSVCRT_intptr_t)GetProcessHeap();
277 /*********************************************************************
280 MSVCRT_size_t CDECL _msize(void* mem)
282 MSVCRT_size_t size = HeapSize(GetProcessHeap(),0,mem);
283 if (size == ~(MSVCRT_size_t)0)
285 WARN(":Probably called with non wine-allocated memory, ret = -1\n");
286 /* At least the Win32 crtdll/msvcrt also return -1 in this case */
291 /*********************************************************************
294 void* CDECL MSVCRT_calloc(MSVCRT_size_t size, MSVCRT_size_t count)
296 return HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, size * count );
299 /*********************************************************************
302 void CDECL MSVCRT_free(void* ptr)
304 HeapFree(GetProcessHeap(),0,ptr);
307 /*********************************************************************
310 void* CDECL MSVCRT_malloc(MSVCRT_size_t size)
312 void *ret = HeapAlloc(GetProcessHeap(),0,size);
314 *MSVCRT__errno() = MSVCRT_ENOMEM;
318 /*********************************************************************
321 void* CDECL MSVCRT_realloc(void* ptr, MSVCRT_size_t size)
323 if (!ptr) return MSVCRT_malloc(size);
324 if (size) return HeapReAlloc(GetProcessHeap(), 0, ptr, size);
329 /*********************************************************************
330 * __p__amblksiz (MSVCRT.@)
332 unsigned int* CDECL __p__amblksiz(void)
334 return &MSVCRT_amblksiz;
337 /*********************************************************************
338 * _get_sbh_threshold (MSVCRT.@)
340 MSVCRT_size_t CDECL _get_sbh_threshold(void)
342 return MSVCRT_sbh_threshold;
345 /*********************************************************************
346 * _set_sbh_threshold (MSVCRT.@)
348 int CDECL _set_sbh_threshold(MSVCRT_size_t threshold)
353 MSVCRT_sbh_threshold = threshold;
357 /*********************************************************************
358 * _aligned_free (MSVCRT.@)
360 void CDECL _aligned_free(void *memblock)
362 TRACE("(%p)\n", memblock);
366 void **saved = SAVED_PTR(memblock);
371 /*********************************************************************
372 * _aligned_offset_malloc (MSVCRT.@)
374 void * CDECL _aligned_offset_malloc(MSVCRT_size_t size, MSVCRT_size_t alignment, MSVCRT_size_t offset)
376 void *memblock, *temp, **saved;
377 TRACE("(%lu, %lu, %lu)\n", size, alignment, offset);
379 /* alignment must be a power of 2 */
380 if ((alignment & (alignment - 1)) != 0)
382 *MSVCRT__errno() = MSVCRT_EINVAL;
386 /* offset must be less than size */
389 *MSVCRT__errno() = MSVCRT_EINVAL;
393 /* don't align to less than void pointer size */
394 if (alignment < sizeof(void *))
395 alignment = sizeof(void *);
397 /* allocate enough space for void pointer and alignment */
398 temp = MSVCRT_malloc(size + alignment + sizeof(void *));
403 /* adjust pointer for proper alignment and offset */
404 memblock = ALIGN_PTR(temp, alignment, offset);
406 /* Save the real allocation address below returned address */
407 /* so it can be found later to free. */
408 saved = SAVED_PTR(memblock);
414 /*********************************************************************
415 * _aligned_malloc (MSVCRT.@)
417 void * CDECL _aligned_malloc(MSVCRT_size_t size, MSVCRT_size_t alignment)
419 TRACE("(%lu, %lu)\n", size, alignment);
420 return _aligned_offset_malloc(size, alignment, 0);
423 /*********************************************************************
424 * _aligned_offset_realloc (MSVCRT.@)
426 void * CDECL _aligned_offset_realloc(void *memblock, MSVCRT_size_t size,
427 MSVCRT_size_t alignment, MSVCRT_size_t offset)
429 void * temp, **saved;
430 MSVCRT_size_t old_padding, new_padding, old_size;
431 TRACE("(%p, %lu, %lu, %lu)\n", memblock, size, alignment, offset);
434 return _aligned_offset_malloc(size, alignment, offset);
436 /* alignment must be a power of 2 */
437 if ((alignment & (alignment - 1)) != 0)
439 *MSVCRT__errno() = MSVCRT_EINVAL;
443 /* offset must be less than size */
446 *MSVCRT__errno() = MSVCRT_EINVAL;
452 _aligned_free(memblock);
456 /* don't align to less than void pointer size */
457 if (alignment < sizeof(void *))
458 alignment = sizeof(void *);
460 /* make sure alignment and offset didn't change */
461 saved = SAVED_PTR(memblock);
462 if (memblock != ALIGN_PTR(*saved, alignment, offset))
464 *MSVCRT__errno() = MSVCRT_EINVAL;
468 old_padding = (char *)memblock - (char *)*saved;
470 /* Get previous size of block */
471 old_size = _msize(*saved);
474 /* It seems this function was called with an invalid pointer. Bail out. */
478 /* Adjust old_size to get amount of actual data in old block. */
479 if (old_size < old_padding)
481 /* Shouldn't happen. Something's weird, so bail out. */
484 old_size -= old_padding;
486 temp = MSVCRT_realloc(*saved, size + alignment + sizeof(void *));
491 /* adjust pointer for proper alignment and offset */
492 memblock = ALIGN_PTR(temp, alignment, offset);
494 /* Save the real allocation address below returned address */
495 /* so it can be found later to free. */
496 saved = SAVED_PTR(memblock);
498 new_padding = (char *)memblock - (char *)temp;
501 Memory layout of old block is as follows:
502 +-------+---------------------+-+--------------------------+-----------+
503 | ... | "old_padding" bytes | | ... "old_size" bytes ... | ... |
504 +-------+---------------------+-+--------------------------+-----------+
507 *saved saved memblock
509 Memory layout of new block is as follows:
510 +-------+-----------------------------+-+----------------------+-------+
511 | ... | "new_padding" bytes | | ... "size" bytes ... | ... |
512 +-------+-----------------------------+-+----------------------+-------+
517 However, in the new block, actual data is still written as follows
518 (because it was copied by MSVCRT_realloc):
519 +-------+---------------------+--------------------------------+-------+
520 | ... | "old_padding" bytes | ... "old_size" bytes ... | ... |
521 +-------+---------------------+--------------------------------+-------+
526 Therefore, min(old_size,size) bytes of actual data have to be moved
527 from the offset they were at in the old block (temp + old_padding),
528 to the offset they have to be in the new block (temp + new_padding == memblock).
530 if (new_padding != old_padding)
531 memmove((char *)memblock, (char *)temp + old_padding, (old_size < size) ? old_size : size);
538 /*********************************************************************
539 * _aligned_realloc (MSVCRT.@)
541 void * CDECL _aligned_realloc(void *memblock, MSVCRT_size_t size, MSVCRT_size_t alignment)
543 TRACE("(%p, %lu, %lu)\n", memblock, size, alignment);
544 return _aligned_offset_realloc(memblock, size, alignment, 0);
547 /*********************************************************************
548 * memmove_s (MSVCRT.@)
550 int CDECL memmove_s(void *dest, MSVCRT_size_t numberOfElements, const void *src, MSVCRT_size_t count)
552 TRACE("(%p %lu %p %lu)\n", dest, numberOfElements, src, count);
559 memset(dest, 0, numberOfElements);
561 *MSVCRT__errno() = MSVCRT_EINVAL;
562 return MSVCRT_EINVAL;
565 if(count > numberOfElements) {
566 memset(dest, 0, numberOfElements);
568 *MSVCRT__errno() = MSVCRT_ERANGE;
569 return MSVCRT_ERANGE;
572 memmove(dest, src, count);
576 /*********************************************************************
577 * strncpy_s (MSVCRT.@)
579 int CDECL strncpy_s(char *dest, MSVCRT_size_t numberOfElements,
580 const char *src, MSVCRT_size_t count)
582 MSVCRT_size_t i, end;
584 TRACE("(%s %lu %s %lu)\n", dest, numberOfElements, src, count);
589 if (!MSVCRT_CHECK_PMT(dest != NULL) || !MSVCRT_CHECK_PMT(src != NULL) || !MSVCRT_CHECK_PMT(numberOfElements != 0)) {
590 *MSVCRT__errno() = MSVCRT_EINVAL;
591 return MSVCRT_EINVAL;
594 if(count!=MSVCRT__TRUNCATE && count<numberOfElements)
597 end = numberOfElements-1;
599 for(i=0; i<end && src[i]; i++)
602 if(!src[i] || end==count || count==MSVCRT__TRUNCATE) {
607 MSVCRT_INVALID_PMT("dest[numberOfElements] is too small");
609 *MSVCRT__errno() = MSVCRT_EINVAL;
610 return MSVCRT_EINVAL;