47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
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/*
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File: high_water_alloc.c
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Copyright (C) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 2.1 of the License, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "misc.h"
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int high_water_alloc(void **buf, size_t *bufsize, size_t newsize)
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{
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#define CHUNK_SIZE 256
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/*
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* Goal here is to avoid unnecessary memory allocations by
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* using static buffers which only grow when necessary.
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* Size is increased in fixed size chunks (CHUNK_SIZE).
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*/
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if (*bufsize < newsize) {
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void *newbuf;
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newsize = (newsize + CHUNK_SIZE-1) & ~(CHUNK_SIZE-1);
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newbuf = realloc(*buf, newsize);
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if (!newbuf)
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return 1;
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*buf = newbuf;
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*bufsize = newsize;
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}
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return 0;
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}
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