nuttx/mm/mm_heap/mm_malloc_size.c

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/****************************************************************************
* mm/mm_heap/mm_malloc_size.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
****************************************************************************/
size_t mm_malloc_size(FAR struct mm_heap_s *heap, FAR void *mem)
{
FAR struct mm_freenode_s *node;
#if CONFIG_MM_HEAP_MEMPOOL_THRESHOLD != 0
ssize_t size = mempool_multiple_alloc_size(heap->mm_mpool, mem);
if (size >= 0)
{
return size;
}
#endif
/* Protect against attempts to query a NULL reference */
if (!mem)
{
return 0;
}
/* Map the memory chunk into a free node */
node = (FAR struct mm_freenode_s *)((FAR char *)mem - SIZEOF_MM_ALLOCNODE);
/* Sanity check against double-frees */
DEBUGASSERT(node->size & MM_ALLOC_BIT);
return SIZEOF_MM_NODE(node) - SIZEOF_MM_ALLOCNODE;
}