/*

  File: high_water_alloc.c

  Copyright (C) 2001-2002 Silicon Graphics, Inc.  All Rights Reserved.

  This program is free software; you can redistribute it and/or modify it under

  the terms of the GNU Lesser General Public License as published by the

  Free Software Foundation; either version 2.1 of the License, or (at

  your option) any later version.

  This program is distributed in the hope that it will be useful, but WITHOUT

  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

  License for more details.

  You should have received a copy of the GNU Lesser General Public

  License along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "config.h"

#include <stdio.h>

#include <stdlib.h>

#include "misc.h"

int __acl_high_water_alloc(void **buf, size_t *bufsize, size_t newsize)

{

#define CHUNK_SIZE	256

	/*

	 * Goal here is to avoid unnecessary memory allocations by

	 * using static buffers which only grow when necessary.

	 * Size is increased in fixed size chunks (CHUNK_SIZE).

	 */

	if (*bufsize < newsize) {

		void *newbuf;

		newsize = (newsize + CHUNK_SIZE-1) & ~(CHUNK_SIZE-1);

		newbuf = realloc(*buf, newsize);

		if (!newbuf)

			return 1;

		*buf = newbuf;

		*bufsize = newsize;

	}

	return 0;

}