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159 lines
2.9 KiB
C
159 lines
2.9 KiB
C
/*
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* msvcrt.dll heap functions
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*
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* Copyright 2000 Jon Griffiths
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Note: Win32 heap operations are MT safe. We only lock the new
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* handler and non atomic heap operations
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*/
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#include <precomp.h>
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#include <stdlib.h>
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#include <malloc.h>
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#define ROUND_DOWN(n, align) \
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(((ULONG)n) & ~((align) - 1l))
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#define ROUND_UP(n, align) \
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ROUND_DOWN(((ULONG)n) + (align) - 1, (align))
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/* round to 16 bytes + alloc at minimum 16 bytes */
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#define ROUND_SIZE(size) (max(16, ROUND_UP(size, 16)))
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/*
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* @implemented
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*/
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void* malloc(size_t _size)
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{
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size_t nSize = ROUND_SIZE(_size);
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if (nSize<_size)
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return NULL;
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return HeapAlloc(GetProcessHeap(), 0, nSize);
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}
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/*
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* @implemented
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*/
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void free(void* _ptr)
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{
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HeapFree(GetProcessHeap(),0,_ptr);
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}
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/*
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* @implemented
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*/
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void* calloc(size_t _nmemb, size_t _size)
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{
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size_t nSize = _nmemb * _size;
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size_t cSize = ROUND_SIZE(nSize);
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if ( (_nmemb > ((size_t)-1 / _size)) || (cSize<nSize))
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return NULL;
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return HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, cSize );
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}
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/*
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* @implemented
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*/
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void* realloc(void* _ptr, size_t _size)
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{
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size_t nSize;
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if (_ptr == NULL)
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return malloc(_size);
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if (_size == 0)
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{
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free(_ptr);
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return NULL;
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}
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nSize = ROUND_SIZE(_size);
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/* check for integer overflow */
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if (nSize<_size)
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return NULL;
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return HeapReAlloc(GetProcessHeap(), 0, _ptr, nSize);
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}
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/*
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* @implemented
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*/
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void* _expand(void* _ptr, size_t _size)
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{
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size_t nSize;
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nSize = ROUND_SIZE(_size);
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if (nSize<_size)
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return NULL;
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return HeapReAlloc(GetProcessHeap(), HEAP_REALLOC_IN_PLACE_ONLY, _ptr, nSize);
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}
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/*
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* @implemented
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*/
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size_t _msize(void* _ptr)
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{
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return HeapSize(GetProcessHeap(), 0, _ptr);
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}
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/*
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* @implemented
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*/
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int _heapchk(void)
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{
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if (!HeapValidate(GetProcessHeap(), 0, NULL))
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return -1;
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return 0;
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}
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/*
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* @implemented
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*/
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int _heapmin(void)
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{
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if (!HeapCompact(GetProcessHeap(), 0))
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return -1;
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return 0;
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}
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/*
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* @implemented
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*/
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int _heapset(unsigned int unFill)
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{
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if (_heapchk() == -1)
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return -1;
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return 0;
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}
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/*
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* @implemented
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*/
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int _heapwalk(struct _heapinfo* entry)
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{
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return 0;
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}
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