1/*
2 * Copyright (c) 1995-2000 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "common.h"
35#include <stdio.h>
36#include <err.h>
37#include "roken.h"
38
39RCSID("$Id: buffer.c 9129 2000-10-23 04:49:25Z joda $");
40
41/*
42 * Allocate a buffer enough to handle st->st_blksize, if
43 * there is such a field, otherwise BUFSIZ.
44 */
45
46void *
47alloc_buffer (void *oldbuf, size_t *sz, struct stat *st)
48{
49    size_t new_sz;
50
51    new_sz = BUFSIZ;
52#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
53    if (st)
54	new_sz = max(BUFSIZ, st->st_blksize);
55#endif
56    if(new_sz > *sz) {
57	if (oldbuf)
58	    free (oldbuf);
59	oldbuf = malloc (new_sz);
60	if (oldbuf == NULL) {
61	    warn ("malloc");
62	    *sz = 0;
63	    return NULL;
64	}
65	*sz = new_sz;
66    }
67    return oldbuf;
68}
69
70