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/*
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 <stdio.h>
#include <stdlib.h>
#include "misc.h"
int 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;
}
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