xref: /freebsd/crypto/heimdal/appl/ftp/common/buffer.c (revision 41466b50c1d5bfd1cf6adaae547a579a75d7c04e)
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 
39 RCSID("$Id: buffer.c,v 1.4 2000/10/23 04:49:25 joda Exp $");
40 
41 /*
42  * Allocate a buffer enough to handle st->st_blksize, if
43  * there is such a field, otherwise BUFSIZ.
44  */
45 
46 void *
47 alloc_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