78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/****************************************************************************
|
|
* libs/libc/obstack/lib_obstack_free.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 <obstack.h>
|
|
#include <nuttx/lib/lib.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: obstack_free
|
|
*
|
|
* Description:
|
|
* Free objects (and everything allocated in the specified obstack more
|
|
* recently than object). You can pass NULL to free everything.
|
|
* The buffer the allocated object was preset is kept and thus can be
|
|
* immediately reused for growing. The only exception for this is when NULL
|
|
* is passed as in such case even the last buffer is freed.
|
|
*
|
|
* Input Parameters:
|
|
* h: pointer to the handle object belongs to
|
|
* object: the pointer to the object or NULL
|
|
*
|
|
****************************************************************************/
|
|
|
|
void obstack_free(FAR struct obstack *h, FAR void *object)
|
|
{
|
|
FAR struct _obstack_chunk *prev;
|
|
|
|
while (h->chunk)
|
|
{
|
|
if (object >=
|
|
(FAR void *)((FAR char *)&h->chunk + sizeof(struct _obstack_chunk))
|
|
&& object < (FAR void *)h->chunk->limit)
|
|
{
|
|
/* The object is in this chunk so just move object base.
|
|
* Note: this keeps the last chunk allocated. This is desirable
|
|
* behavior as we can decide if we want to reuse it by either
|
|
* passing NULL to free everything or the first returned object to
|
|
* keep the chunk allocated.
|
|
*/
|
|
|
|
h->object_base = object;
|
|
h->next_free = object;
|
|
return;
|
|
}
|
|
|
|
prev = h->chunk->prev;
|
|
lib_free(h->chunk);
|
|
h->chunk = prev;
|
|
}
|
|
|
|
h->object_base = NULL;
|
|
h->next_free = NULL;
|
|
}
|