nuttx/mm/mm_heap/mm_heapmember.c

/****************************************************************************
 * mm/mm_heap/mm_heapmember.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <assert.h>
#include <debug.h>

#include <nuttx/mm/mm.h>

#include "mm_heap/mm.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: mm_heapmember
 *
 * Description:
 *   Check if an address lies in the heap.
 *
 * Parameters:
 *   heap - The heap to check
 *   mem  - The address to check
 *
 * Return Value:
 *   true if the address is a member of the heap.  false if not
 *   not.  If the address is not a member of the heap, then it
 *   must be a member of the user-space heap (unchecked)
 *
 ****************************************************************************/

bool mm_heapmember(FAR struct mm_heap_s *heap, FAR void *mem)
{
  FAR struct mm_heap_impl_s *heap_impl;

  DEBUGASSERT(MM_IS_VALID(heap));
  heap_impl = heap->mm_impl;

#if CONFIG_MM_REGIONS > 1
  int i;

  /* A valid address from the heap for this region would have to lie
   * between the region's two guard nodes.
   */

  for (i = 0; i < heap_impl->mm_nregions; i++)
    {
      if (mem > (FAR void *)heap_impl->mm_heapstart[i] &&
          mem < (FAR void *)heap_impl->mm_heapend[i])
        {
          return true;
        }
    }

  /* The address does not like any any region assigned to the heap */

  return false;

#else
  /* A valid address from the heap would have to lie between the
   * two guard nodes.
   */

  if (mem > (FAR void *)heap_impl->mm_heapstart[0] &&
      mem < (FAR void *)heap_impl->mm_heapend[0])
    {
      return true;
    }

  /* Otherwise, the address does not lie in the heap */

  return false;

#endif
}