| /**************************************************************************** |
| * 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; |
| } |