1 /* $OpenBSD: disklabel.c,v 1.5 2003/08/11 06:23:09 deraadt Exp $ */
2 /* $NetBSD: disklabel.c,v 1.3 1994/10/26 05:44:42 cgd Exp $ */
3
4 /*-
5 * Copyright (c) 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)disklabel.c 8.1 (Berkeley) 6/11/93
33 */
34
35 #include <sys/param.h>
36 #include <sys/disklabel.h>
37 #include "stand.h"
38
39 char *
getdisklabel(const char * buf,struct disklabel * lp)40 getdisklabel(const char *buf, struct disklabel *lp)
41 {
42 struct disklabel *dlp, *elp;
43 char *msg = NULL;
44
45 elp = (struct disklabel *)(buf + DEV_BSIZE - sizeof(*dlp));
46 for (dlp = (struct disklabel *)buf; dlp <= elp;
47 dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
48 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
49 if (msg == NULL)
50 msg = "no disk label";
51 } else if (dlp->d_npartitions > MAXPARTITIONS ||
52 dkcksum(dlp) != 0)
53 msg = "disk label corrupted";
54 else {
55 *lp = *dlp;
56 msg = NULL;
57 break;
58 }
59 }
60 return (msg);
61 }
62