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/*
* libc/stdlib/malloc/heap_alloc_at.c -- allocate at a specific address
*
* Copyright (C) 2002 NEC Corporation
* Copyright (C) 2002 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*
* Written by Miles Bader <miles@gnu.org>
*/
#include <stdlib.h>
#include "heap.h"
/* Allocate SIZE bytes at address MEM in HEAP. Return the actual size
allocated, or 0 if we failed. */
size_t
__heap_alloc_at (struct heap *heap, void *mem, size_t size)
{
struct heap_free_area *fa;
size_t alloced = 0;
size = HEAP_ADJUST_SIZE (size);
HEAP_DEBUG (heap, "before __heap_alloc_at");
/* Look for a free area that can contain SIZE bytes. */
for (fa = heap->free_areas; fa; fa = fa->next)
{
void *fa_mem = HEAP_FREE_AREA_START (fa);
if (fa_mem <= mem)
{
if (fa_mem == mem && fa->size >= size)
/* FA has the right addr, and is big enough! */
alloced = __heap_free_area_alloc (heap, fa, size);
break;
}
}
HEAP_DEBUG (heap, "after __heap_alloc_at");
return alloced;
}
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