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