1 /* $NetBSD: disklabel.c,v 1.10 2007/11/24 13:20:54 isaki Exp $ */
2
3 /*-
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)disklabel.c 8.1 (Berkeley) 6/11/93
32 */
33
34 #include <sys/param.h>
35 #include <sys/disklabel.h>
36 #include "stand.h"
37
38
39 #if defined(LIBSA_NO_DISKLABEL_MSGS)
40 #define nolabel (char *)1
41 #define corruptedlabel (char *)1
42 #else
43 static char nolabel[] = "no disk label";
44 static char corruptedlabel[] = "disk label corrupted";
45 #endif
46
47 char *
getdisklabel(const char * buf,struct disklabel * lp)48 getdisklabel(const char *buf, struct disklabel *lp)
49 {
50 const struct disklabel *dlp, *elp;
51 char *msg = NULL;
52
53 elp = (const void *)(buf + DEV_BSIZE - sizeof(*dlp));
54 for (dlp = (const void *)buf; dlp <= elp;
55 dlp = (const void *)((const char *)dlp + sizeof(long))) {
56 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
57 if (msg == NULL)
58 msg = nolabel;
59 } else if (dlp->d_npartitions > MAXPARTITIONS ||
60 dkcksum(dlp) != 0) {
61 msg = corruptedlabel;
62 } else {
63 (void)memcpy(lp, dlp, sizeof *lp);
64 msg = NULL;
65 break;
66 }
67 }
68 return msg;
69 }
70