80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
/****************************************************************************
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* libs/libc/obstack/lib_obstack_free.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <obstack.h>
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#include <nuttx/lib/lib.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: obstack_free
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*
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* Description:
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* Free objects (and everything allocated in the specified obstack more
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* recently than object). You can pass NULL to free everything.
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* The buffer the allocated object was preset is kept and thus can be
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* immediately reused for growing. The only exception for this is when NULL
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* is passed as in such case even the last buffer is freed.
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*
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* Input Parameters:
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* h: pointer to the handle object belongs to
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* object: the pointer to the object or NULL
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*
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****************************************************************************/
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void obstack_free(FAR struct obstack *h, FAR void *object)
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{
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FAR struct _obstack_chunk *prev;
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while (h->chunk)
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{
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if (object >=
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(FAR void *)((FAR char *)&h->chunk + sizeof(struct _obstack_chunk))
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&& object < (FAR void *)h->chunk->limit)
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{
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/* The object is in this chunk so just move object base.
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* Note: this keeps the last chunk allocated. This is desirable
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* behavior as we can decide if we want to reuse it by either
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* passing NULL to free everything or the first returned object to
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* keep the chunk allocated.
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*/
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h->object_base = object;
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h->next_free = object;
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return;
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}
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prev = h->chunk->prev;
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lib_free(h->chunk);
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h->chunk = prev;
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}
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h->object_base = NULL;
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h->next_free = NULL;
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}
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