heap.c

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/*
 * msvcrt.dll heap functions
 *
 * Copyright 2000 Jon Griffiths
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * Note: Win32 heap operations are MT safe. We only lock the new
 *       handler and non atomic heap operations
 */
 
#include <precomp.h>
#include <malloc.h>
 
#define MSVCRT_size_t size_t
#define MSVCRT_intptr_t intptr_t
#define MSVCRT_wchar_t wchar_t
#define MSVCRT__HEAPBADNODE _HEAPBADNODE
#define MSVCRT__HEAPOK _HEAPOK
#define MSVCRT__HEAPEND _HEAPEND
#define MSVCRT__FREEENTRY _FREEENTRY
#define MSVCRT__USEDENTRY _USEDENTRY
#define MSVCRT__HEAPBADBEGIN _HEAPBADBEGIN
#define MSVCRT_EINVAL EINVAL
#define MSVCRT_ENOSYS ENOSYS
#define MSVCRT_ENOMEM ENOMEM
#define MSVCRT_ERANGE ERANGE
#define MSVCRT__TRUNCATE _TRUNCATE
#define MSVCRT__heapinfo _heapinfo
#define MSVCRT__errno _errno
#define MSVCRT_calloc calloc
#define MSVCRT_malloc malloc
#define MSVCRT_realloc realloc
#define MSVCRT_free free
#define MSVCRT_memcpy_s memcpy_s
#define MSVCRT_memmove_s memmove_s
#define MSVCRT_strncpy_s strncpy_s
#define msvcrt_set_errno _dosmaperr
 
/* MT */
#define LOCK_HEAP   _lock( _HEAP_LOCK )
#define UNLOCK_HEAP _unlock( _HEAP_LOCK )
 
/* _aligned */
#define SAVED_PTR(x) ((void *)((DWORD_PTR)((char *)x - sizeof(void *)) & \
                               ~(sizeof(void *) - 1)))
#define ALIGN_PTR(ptr, alignment, offset) ((void *) \
    ((((DWORD_PTR)((char *)ptr + alignment + sizeof(void *) + offset)) & \
      ~(alignment - 1)) - offset))
 
#define SB_HEAP_ALIGN 16
 
static HANDLE heap, sb_heap;
 
typedef int (CDECL *MSVCRT_new_handler_func)(size_t size);
 
static MSVCRT_new_handler_func MSVCRT_new_handler;
static int MSVCRT_new_mode;
 
/* FIXME - According to documentation it should be 8*1024, at runtime it returns 16 */ 
static unsigned int MSVCRT_amblksiz = 16;
/* FIXME - According to documentation it should be 480 bytes, at runtime default is 0 */
static size_t MSVCRT_sbh_threshold = 0;
 
static void* msvcrt_heap_alloc(DWORD flags, size_t size)
{
    if(size < MSVCRT_sbh_threshold)
    {
        void *memblock, *temp, **saved;
 
        temp = HeapAlloc(sb_heap, flags, size+sizeof(void*)+SB_HEAP_ALIGN);
        if(!temp) return NULL;
 
        memblock = ALIGN_PTR(temp, SB_HEAP_ALIGN, 0);
        saved = SAVED_PTR(memblock);
        *saved = temp;
        return memblock;
    }
 
    return HeapAlloc(heap, flags, size);
}
 
static void* msvcrt_heap_realloc(DWORD flags, void *ptr, size_t size)
{
    if(sb_heap && ptr && !HeapValidate(heap, 0, ptr))
    {
        /* TODO: move data to normal heap if it exceeds sbh_threshold limit */
        void *memblock, *temp, **saved;
        size_t old_padding, new_padding, old_size;
 
        saved = SAVED_PTR(ptr);
        old_padding = (char*)ptr - (char*)*saved;
        old_size = HeapSize(sb_heap, 0, *saved);
        if(old_size == -1)
            return NULL;
        old_size -= old_padding;
 
        temp = HeapReAlloc(sb_heap, flags, *saved, size+sizeof(void*)+SB_HEAP_ALIGN);
        if(!temp) return NULL;
 
        memblock = ALIGN_PTR(temp, SB_HEAP_ALIGN, 0);
        saved = SAVED_PTR(memblock);
        new_padding = (char*)memblock - (char*)temp;
 
        if(new_padding != old_padding)
            memmove(memblock, (char*)temp+old_padding, old_size>size ? size : old_size);
 
        *saved = temp;
        return memblock;
    }
 
    return HeapReAlloc(heap, flags, ptr, size);
}
 
static BOOL msvcrt_heap_free(void *ptr)
{
    if(sb_heap && ptr && !HeapValidate(heap, 0, ptr))
    {
        void **saved = SAVED_PTR(ptr);
        return HeapFree(sb_heap, 0, *saved);
    }
 
    return HeapFree(heap, 0, ptr);
}
 
static size_t msvcrt_heap_size(void *ptr)
{
    if(sb_heap && ptr && !HeapValidate(heap, 0, ptr))
    {
        void **saved = SAVED_PTR(ptr);
        return HeapSize(sb_heap, 0, *saved);
    }
 
    return HeapSize(heap, 0, ptr);
}
 
/*********************************************************************
 *      _callnewh (MSVCRT.@)
 */
int CDECL _callnewh(size_t size)
{
  int ret = 0;
  MSVCRT_new_handler_func handler = MSVCRT_new_handler;
  if(handler)
    ret = (*handler)(size) ? 1 : 0;
  return ret;
}
 
/*********************************************************************
 *      ??2@YAPAXI@Z (MSVCRT.@)
 */
void* CDECL DECLSPEC_HOTPATCH operator_new(size_t size)
{
  void *retval;
 
  do
  {
    retval = msvcrt_heap_alloc(0, size);
    if(retval)
    {
      TRACE("(%Iu) returning %p\n", size, retval);
      return retval;
    }
  } while(_callnewh(size));
 
  TRACE("(%Iu) out of memory\n", size);
#if _MSVCR_VER >= 80
  throw_bad_alloc();
#endif
  return NULL;
}
 
 
/*********************************************************************
 *      ??2@YAPAXIHPBDH@Z (MSVCRT.@)
 */
void* CDECL operator_new_dbg(size_t size, int type, const char *file, int line)
{
    return operator_new( size );
}
 
 
/*********************************************************************
 *      ??3@YAXPAX@Z (MSVCRT.@)
 */
void CDECL DECLSPEC_HOTPATCH operator_delete(void *mem)
{
  TRACE("(%p)\n", mem);
  msvcrt_heap_free(mem);
}
 
 
/*********************************************************************
 *      ?_query_new_handler@@YAP6AHI@ZXZ (MSVCRT.@)
 */
MSVCRT_new_handler_func CDECL _query_new_handler(void)
{
  return MSVCRT_new_handler;
}
 
 
/*********************************************************************
 *      ?_query_new_mode@@YAHXZ (MSVCRT.@)
 */
int CDECL _query_new_mode(void)
{
  return MSVCRT_new_mode;
}
 
/*********************************************************************
 *      ?_set_new_handler@@YAP6AHI@ZP6AHI@Z@Z (MSVCRT.@)
 */
MSVCRT_new_handler_func CDECL _set_new_handler(MSVCRT_new_handler_func func)
{
  MSVCRT_new_handler_func old_handler;
  LOCK_HEAP;
  old_handler = MSVCRT_new_handler;
  MSVCRT_new_handler = func;
  UNLOCK_HEAP;
  return old_handler;
}
 
/*********************************************************************
 *      ?set_new_handler@@YAP6AXXZP6AXXZ@Z (MSVCRT.@)
 */
MSVCRT_new_handler_func CDECL set_new_handler(void *func)
{
  TRACE("(%p)\n",func);
  _set_new_handler(NULL);
  return NULL;
}
 
/*********************************************************************
 *      ?_set_new_mode@@YAHH@Z (MSVCRT.@)
 */
int CDECL _set_new_mode(int mode)
{
  if(!MSVCRT_CHECK_PMT(mode == 0 || mode == 1)) return -1;
  return InterlockedExchange((long*)&MSVCRT_new_mode, mode);
}
 
/*********************************************************************
 *      _expand (MSVCRT.@)
 */
void* CDECL _expand(void* mem, size_t size)
{
  return msvcrt_heap_realloc(HEAP_REALLOC_IN_PLACE_ONLY, mem, size);
}
 
/*********************************************************************
 *      _heapchk (MSVCRT.@)
 */
int CDECL _heapchk(void)
{
  if (!HeapValidate(heap, 0, NULL) ||
          (sb_heap && !HeapValidate(sb_heap, 0, NULL)))
  {
    msvcrt_set_errno(GetLastError());
    return _HEAPBADNODE;
  }
  return _HEAPOK;
}
 
/*********************************************************************
 *      _heapmin (MSVCRT.@)
 */
int CDECL _heapmin(void)
{
  if (!HeapCompact( heap, 0 ) ||
          (sb_heap && !HeapCompact( sb_heap, 0 )))
  {
    if (GetLastError() != ERROR_CALL_NOT_IMPLEMENTED)
      msvcrt_set_errno(GetLastError());
    return -1;
  }
  return 0;
}
 
/*********************************************************************
 *      _heapwalk (MSVCRT.@)
 */
int CDECL _heapwalk(_HEAPINFO *next)
{
  PROCESS_HEAP_ENTRY phe;
 
  if (sb_heap)
      FIXME("small blocks heap not supported\n");
 
  LOCK_HEAP;
  phe.lpData = next->_pentry;
  phe.cbData = (DWORD)next->_size;
  phe.wFlags = next->_useflag == _USEDENTRY ? PROCESS_HEAP_ENTRY_BUSY : 0;
 
  if (phe.lpData && phe.wFlags & PROCESS_HEAP_ENTRY_BUSY &&
      !HeapValidate( heap, 0, phe.lpData ))
  {
    UNLOCK_HEAP;
    msvcrt_set_errno(GetLastError());
    return _HEAPBADNODE;
  }
 
  do
  {
    if (!HeapWalk( heap, &phe ))
    {
      UNLOCK_HEAP;
      if (GetLastError() == ERROR_NO_MORE_ITEMS)
         return _HEAPEND;
      msvcrt_set_errno(GetLastError());
      if (!phe.lpData)
        return _HEAPBADBEGIN;
      return _HEAPBADNODE;
    }
  } while (phe.wFlags & (PROCESS_HEAP_REGION|PROCESS_HEAP_UNCOMMITTED_RANGE));
 
  UNLOCK_HEAP;
  next->_pentry = phe.lpData;
  next->_size = phe.cbData;
  next->_useflag = phe.wFlags & PROCESS_HEAP_ENTRY_BUSY ? _USEDENTRY : _FREEENTRY;
  return _HEAPOK;
}
 
/*********************************************************************
 *      _heapset (MSVCRT.@)
 */
int CDECL _heapset(unsigned int value)
{
  int retval;
  _HEAPINFO heap;
 
  memset( &heap, 0, sizeof(heap) );
  LOCK_HEAP;
  while ((retval = _heapwalk(&heap)) == _HEAPOK)
  {
    if (heap._useflag == _FREEENTRY)
      memset(heap._pentry, value, heap._size);
  }
  UNLOCK_HEAP;
  return retval == _HEAPEND ? _HEAPOK : retval;
}
 
/*********************************************************************
 *      _heapadd (MSVCRT.@)
 */
int CDECL _heapadd(void* mem, size_t size)
{
  TRACE("(%p,%Iu) unsupported in Win32\n", mem,size);
  *_errno() = ENOSYS;
  return -1;
}
 
/*********************************************************************
 *      _get_heap_handle (MSVCRT.@)
 */
intptr_t CDECL _get_heap_handle(void)
{
    return (intptr_t)heap;
}
 
/*********************************************************************
 *      _msize (MSVCRT.@)
 */
size_t CDECL _msize(void* mem)
{
  size_t size = msvcrt_heap_size(mem);
  if (size == ~(size_t)0)
  {
    WARN(":Probably called with non wine-allocated memory, ret = -1\n");
    /* At least the Win32 crtdll/msvcrt also return -1 in this case */
  }
  return size;
}
 
#if _MSVCR_VER>=80
/*********************************************************************
 * _aligned_msize (MSVCR80.@)
 */
size_t CDECL _aligned_msize(void *p, size_t alignment, size_t offset)
{
    void **alloc_ptr;
 
    if(!MSVCRT_CHECK_PMT(p)) return -1;
 
    if(alignment < sizeof(void*))
        alignment = sizeof(void*);
 
    alloc_ptr = SAVED_PTR(p);
    return _msize(*alloc_ptr)-alignment-sizeof(void*);
}
#endif
 
/*********************************************************************
 *      calloc (MSVCRT.@)
 */
void* CDECL DECLSPEC_HOTPATCH calloc(size_t count, size_t size)
{
  size_t bytes = count*size;
 
  if (size && bytes / size != count)
  {
    *_errno() = ENOMEM;
    return NULL;
  }
 
  return msvcrt_heap_alloc(HEAP_ZERO_MEMORY, bytes);
}
 
#if _MSVCR_VER>=140
/*********************************************************************
 *      _calloc_base (UCRTBASE.@)
 */
void* CDECL _calloc_base(size_t count, size_t size)
{
  return calloc(count, size);
}
#endif
 
/*********************************************************************
 *      free (MSVCRT.@)
 */
void CDECL DECLSPEC_HOTPATCH free(void* ptr)
{
  msvcrt_heap_free(ptr);
}
 
#if _MSVCR_VER>=140
/*********************************************************************
 *      _free_base (UCRTBASE.@)
 */
void CDECL _free_base(void* ptr)
{
  msvcrt_heap_free(ptr);
}
#endif
 
/*********************************************************************
 *                  malloc (MSVCRT.@)
 */
void* CDECL malloc(size_t size)
{
    void *ret;
 
    do
    {
        ret = msvcrt_heap_alloc(0, size);
        if (ret || !MSVCRT_new_mode)
            break;
    } while(_callnewh(size));
 
    if (!ret)
        *_errno() = ENOMEM;
    return ret;
}
 
#if _MSVCR_VER>=140
/*********************************************************************
 *                  _malloc_base (UCRTBASE.@)
 */
void* CDECL _malloc_base(size_t size)
{
  return malloc(size);
}
#endif
 
/*********************************************************************
 *      realloc (MSVCRT.@)
 */
void* CDECL DECLSPEC_HOTPATCH realloc(void* ptr, size_t size)
{
  if (!ptr) return malloc(size);
  if (size) return msvcrt_heap_realloc(0, ptr, size);
  free(ptr);
  return NULL;
}
 
#if _MSVCR_VER>=140
/*********************************************************************
 *      _realloc_base (UCRTBASE.@)
 */
void* CDECL _realloc_base(void* ptr, size_t size)
{
  return realloc(ptr, size);
}
#endif
 
#if _MSVCR_VER>=80
/*********************************************************************
 * _recalloc (MSVCR80.@)
 */
void* CDECL _recalloc(void *mem, size_t num, size_t size)
{
    size_t old_size;
    void *ret;
 
    if(!mem)
        return calloc(num, size);
 
    size = num*size;
    old_size = _msize(mem);
 
    ret = realloc(mem, size);
    if(!ret) {
        *_errno() = ENOMEM;
        return NULL;
    }
 
    if(size>old_size)
        memset((BYTE*)ret+old_size, 0, size-old_size);
    return ret;
}
#endif
 
/*********************************************************************
 *      __p__amblksiz (MSVCRT.@)
 */
unsigned int* CDECL __p__amblksiz(void)
{
  return &MSVCRT_amblksiz;
}
 
/*********************************************************************
 *      _get_sbh_threshold (MSVCRT.@)
 */
size_t CDECL _get_sbh_threshold(void)
{
  return MSVCRT_sbh_threshold;
}
 
/*********************************************************************
 *      _set_sbh_threshold (MSVCRT.@)
 */
int CDECL _set_sbh_threshold(size_t threshold)
{
#ifdef _WIN64
  return 0;
#else
  if(threshold > 1016)
     return 0;
 
  if(!sb_heap)
  {
      sb_heap = HeapCreate(0, 0, 0);
      if(!sb_heap)
          return 0;
  }
 
  MSVCRT_sbh_threshold = (threshold+0xf) & ~0xf;
  return 1;
#endif
}
 
/*********************************************************************
 *      _aligned_free (MSVCRT.@)
 */
void CDECL _aligned_free(void *memblock)
{
    TRACE("(%p)\n", memblock);
 
    if (memblock)
    {
        void **saved = SAVED_PTR(memblock);
        free(*saved);
    }
}
 
/*********************************************************************
 *      _aligned_offset_malloc (MSVCRT.@)
 */
void * CDECL _aligned_offset_malloc(size_t size, size_t alignment, size_t offset)
{
    void *memblock, *temp, **saved;
    TRACE("(%Iu, %Iu, %Iu)\n", size, alignment, offset);
 
    /* alignment must be a power of 2 */
    if ((alignment & (alignment - 1)) != 0)
    {
        *_errno() = EINVAL;
        return NULL;
    }
 
    /* offset must be less than size */
    if (offset && offset >= size)
    {
        *_errno() = EINVAL;
        return NULL;
    }
 
    /* don't align to less than void pointer size */
    if (alignment < sizeof(void *))
        alignment = sizeof(void *);
 
    /* allocate enough space for void pointer and alignment */
    temp = malloc(size + alignment + sizeof(void *));
 
    if (!temp)
        return NULL;
 
    /* adjust pointer for proper alignment and offset */
    memblock = ALIGN_PTR(temp, alignment, offset);
 
    /* Save the real allocation address below returned address */
    /* so it can be found later to free. */
    saved = SAVED_PTR(memblock);
    *saved = temp;
 
    return memblock;
}
 
/*********************************************************************
 *      _aligned_malloc (MSVCRT.@)
 */
void * CDECL _aligned_malloc(size_t size, size_t alignment)
{
    TRACE("(%Iu, %Iu)\n", size, alignment);
    return _aligned_offset_malloc(size, alignment, 0);
}
 
/*********************************************************************
 *      _aligned_offset_realloc (MSVCRT.@)
 */
void * CDECL _aligned_offset_realloc(void *memblock, size_t size,
                                     size_t alignment, size_t offset)
{
    void * temp, **saved;
    size_t old_padding, new_padding, old_size;
    TRACE("(%p, %Iu, %Iu, %Iu)\n", memblock, size, alignment, offset);
 
    if (!memblock)
        return _aligned_offset_malloc(size, alignment, offset);
 
    /* alignment must be a power of 2 */
    if ((alignment & (alignment - 1)) != 0)
    {
        *_errno() = EINVAL;
        return NULL;
    }
 
    /* offset must be less than size */
    if (offset >= size)
    {
        *_errno() = EINVAL;
        return NULL;
    }
 
    if (size == 0)
    {
        _aligned_free(memblock);
        return NULL;
    }
 
    /* don't align to less than void pointer size */
    if (alignment < sizeof(void *))
        alignment = sizeof(void *);
 
    /* make sure alignment and offset didn't change */
    saved = SAVED_PTR(memblock);
    if (memblock != ALIGN_PTR(*saved, alignment, offset))
    {
        *_errno() = EINVAL;
        return NULL;
    }
 
    old_padding = (char *)memblock - (char *)*saved;
 
    /* Get previous size of block */
    old_size = _msize(*saved);
    if (old_size == -1)
    {
        /* It seems this function was called with an invalid pointer. Bail out. */
        return NULL;
    }
 
    /* Adjust old_size to get amount of actual data in old block. */
    if (old_size < old_padding)
    {
        /* Shouldn't happen. Something's weird, so bail out. */
        return NULL;
    }
    old_size -= old_padding;
 
    temp = realloc(*saved, size + alignment + sizeof(void *));
 
    if (!temp)
        return NULL;
 
    /* adjust pointer for proper alignment and offset */
    memblock = ALIGN_PTR(temp, alignment, offset);
 
    /* Save the real allocation address below returned address */
    /* so it can be found later to free. */
    saved = SAVED_PTR(memblock);
 
    new_padding = (char *)memblock - (char *)temp;
 
/*
   Memory layout of old block is as follows:
   +-------+---------------------+-+--------------------------+-----------+
   |  ...  | "old_padding" bytes | | ... "old_size" bytes ... |    ...    |
   +-------+---------------------+-+--------------------------+-----------+
           ^                     ^ ^
           |                     | |
        *saved               saved memblock
 
   Memory layout of new block is as follows:
   +-------+-----------------------------+-+----------------------+-------+
   |  ...  |    "new_padding" bytes      | | ... "size" bytes ... |  ...  |
   +-------+-----------------------------+-+----------------------+-------+
           ^                             ^ ^
           |                             | |
          temp                       saved memblock
 
   However, in the new block, actual data is still written as follows
   (because it was copied by realloc):
   +-------+---------------------+--------------------------------+-------+
   |  ...  | "old_padding" bytes |   ... "old_size" bytes ...     |  ...  |
   +-------+---------------------+--------------------------------+-------+
           ^                             ^ ^
           |                             | |
          temp                       saved memblock
 
   Therefore, min(old_size,size) bytes of actual data have to be moved
   from the offset they were at in the old block (temp + old_padding),
   to the offset they have to be in the new block (temp + new_padding == memblock).
*/
    if (new_padding != old_padding)
        memmove((char *)memblock, (char *)temp + old_padding, (old_size < size) ? old_size : size);
 
    *saved = temp;
 
    return memblock;
}
 
/*********************************************************************
 *      _aligned_realloc (MSVCRT.@)
 */
void * CDECL _aligned_realloc(void *memblock, size_t size, size_t alignment)
{
    TRACE("(%p, %Iu, %Iu)\n", memblock, size, alignment);
    return _aligned_offset_realloc(memblock, size, alignment, 0);
}
 
/*********************************************************************
 *      memmove_s (MSVCRT.@)
 */
int CDECL memmove_s(void *dest, size_t numberOfElements, const void *src, size_t count)
{
    TRACE("(%p %Iu %p %Iu)\n", dest, numberOfElements, src, count);
 
    if(!count)
        return 0;
 
    if (!MSVCRT_CHECK_PMT(dest != NULL)) return EINVAL;
    if (!MSVCRT_CHECK_PMT(src != NULL)) return EINVAL;
    if (!MSVCRT_CHECK_PMT_ERR( count <= numberOfElements, ERANGE )) return ERANGE;
 
    memmove(dest, src, count);
    return 0;
}
 
#if _MSVCR_VER>=100
/*********************************************************************
 *              wmemmove_s (MSVCR100.@)
 */
int CDECL wmemmove_s(wchar_t *dest, size_t numberOfElements,
        const wchar_t *src, size_t count)
{
    TRACE("(%p %Iu %p %Iu)\n", dest, numberOfElements, src, count);
 
    if (!count)
        return 0;
 
    /* Native does not seem to conform to 6.7.1.2.3 in
     * http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1225.pdf
     * in that it does not zero the output buffer on constraint violation.
     */
    if (!MSVCRT_CHECK_PMT(dest != NULL)) return EINVAL;
    if (!MSVCRT_CHECK_PMT(src != NULL)) return EINVAL;
    if (!MSVCRT_CHECK_PMT_ERR(count <= numberOfElements, ERANGE)) return ERANGE;
 
    memmove(dest, src, sizeof(wchar_t)*count);
    return 0;
}
#endif
 
/*********************************************************************
 *      memcpy_s (MSVCRT.@)
 */
int CDECL memcpy_s(void *dest, size_t numberOfElements, const void *src, size_t count)
{
    TRACE("(%p %Iu %p %Iu)\n", dest, numberOfElements, src, count);
 
    if(!count)
        return 0;
 
    if (!MSVCRT_CHECK_PMT(dest != NULL)) return EINVAL;
    if (!MSVCRT_CHECK_PMT(src != NULL))
    {
        memset(dest, 0, numberOfElements);
        return EINVAL;
    }
    if (!MSVCRT_CHECK_PMT_ERR( count <= numberOfElements, ERANGE ))
    {
        memset(dest, 0, numberOfElements);
        return ERANGE;
    }
 
    memmove(dest, src, count);
    return 0;
}
 
#if _MSVCR_VER>=100
/*********************************************************************
 *              wmemcpy_s (MSVCR100.@)
 */
int CDECL wmemcpy_s(wchar_t *dest, size_t numberOfElements,
        const wchar_t *src, size_t count)
{
    TRACE("(%p %Iu %p %Iu)\n", dest, numberOfElements, src, count);
 
    if (!count)
        return 0;
 
    if (!MSVCRT_CHECK_PMT(dest != NULL)) return EINVAL;
 
    if (!MSVCRT_CHECK_PMT(src != NULL)) {
        memset(dest, 0, numberOfElements*sizeof(wchar_t));
        return EINVAL;
    }
    if (!MSVCRT_CHECK_PMT_ERR(count <= numberOfElements, ERANGE)) {
        memset(dest, 0, numberOfElements*sizeof(wchar_t));
        return ERANGE;
    }
 
    memmove(dest, src, sizeof(wchar_t)*count);
    return 0;
}
#endif
 
/*********************************************************************
 *      strncpy_s (MSVCRT.@)
 */
int CDECL strncpy_s(char *dest, size_t numberOfElements,
        const char *src, size_t count)
{
    size_t i, end;
 
    TRACE("(%p %Iu %s %Iu)\n", dest, numberOfElements, debugstr_a(src), count);
 
    if(!count) {
        if(dest && numberOfElements)
            *dest = 0;
        return 0;
    }
 
    if (!MSVCRT_CHECK_PMT(dest != NULL)) return EINVAL;
    if (!MSVCRT_CHECK_PMT(src != NULL)) return EINVAL;
    if (!MSVCRT_CHECK_PMT(numberOfElements != 0)) return EINVAL;
 
    if(count!=_TRUNCATE && count<numberOfElements)
        end = count;
    else
        end = numberOfElements-1;
 
    for(i=0; i<end && src[i]; i++)
        dest[i] = src[i];
 
    if(!src[i] || end==count || count==_TRUNCATE) {
        dest[i] = '\0';
        return 0;
    }
 
    MSVCRT_INVALID_PMT("dest[numberOfElements] is too small", EINVAL);
    dest[0] = '\0';
    return EINVAL;
}
 
BOOL msvcrt_init_heap(void)
{
#ifdef __REACTOS__
    heap = GetProcessHeap();
#else
    heap = HeapCreate(0, 0, 0);
#endif
    return heap != NULL;
}
 
void msvcrt_destroy_heap(void)
{
    HeapDestroy(heap);
    if(sb_heap)
        HeapDestroy(sb_heap);
}