69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
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/****************************************************************************
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* libs/libc/obstack/lib_obstack_alloc.c
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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 "lib_obstack_malloc.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_alloc
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*
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* Description:
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* Allocate an object of given size with uninitialized bytes.
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* Compared to the GlibC version this uses malloc to allocate exactly
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* required space (plus overhead) and nothing more.
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*
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* Input Parameters:
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* h: pointer to the handle to allocate an object in
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* size: number of bytes to allocate
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*
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****************************************************************************/
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FAR void *obstack_alloc(FAR struct obstack *h, size_t size)
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{
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FAR struct _obstack_chunk *prev;
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FAR void *res;
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if (h->chunk == NULL || (h->chunk->limit - h->object_base) < size)
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{
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/* TODO: could we just expand current allocation? */
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prev = h->chunk;
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h->chunk = lib_obstack_malloc(size + sizeof(struct _obstack_chunk));
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h->chunk->limit =
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(FAR char *)h->chunk + sizeof(struct _obstack_chunk) + size;
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h->chunk->prev = prev;
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h->object_base = (FAR char *)h->chunk + sizeof(struct _obstack_chunk);
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}
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res = h->object_base;
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h->object_base += size;
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h->next_free = h->object_base;
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return res;
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}
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