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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;

}