1*58a2b000SEvgeniy Ivanov /* $NetBSD: disklabel.c,v 1.10 2007/11/24 13:20:54 isaki Exp $ */
2*58a2b000SEvgeniy Ivanov
3*58a2b000SEvgeniy Ivanov /*-
4*58a2b000SEvgeniy Ivanov * Copyright (c) 1993
5*58a2b000SEvgeniy Ivanov * The Regents of the University of California. All rights reserved.
6*58a2b000SEvgeniy Ivanov *
7*58a2b000SEvgeniy Ivanov * Redistribution and use in source and binary forms, with or without
8*58a2b000SEvgeniy Ivanov * modification, are permitted provided that the following conditions
9*58a2b000SEvgeniy Ivanov * are met:
10*58a2b000SEvgeniy Ivanov * 1. Redistributions of source code must retain the above copyright
11*58a2b000SEvgeniy Ivanov * notice, this list of conditions and the following disclaimer.
12*58a2b000SEvgeniy Ivanov * 2. Redistributions in binary form must reproduce the above copyright
13*58a2b000SEvgeniy Ivanov * notice, this list of conditions and the following disclaimer in the
14*58a2b000SEvgeniy Ivanov * documentation and/or other materials provided with the distribution.
15*58a2b000SEvgeniy Ivanov * 3. Neither the name of the University nor the names of its contributors
16*58a2b000SEvgeniy Ivanov * may be used to endorse or promote products derived from this software
17*58a2b000SEvgeniy Ivanov * without specific prior written permission.
18*58a2b000SEvgeniy Ivanov *
19*58a2b000SEvgeniy Ivanov * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20*58a2b000SEvgeniy Ivanov * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21*58a2b000SEvgeniy Ivanov * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22*58a2b000SEvgeniy Ivanov * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23*58a2b000SEvgeniy Ivanov * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24*58a2b000SEvgeniy Ivanov * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25*58a2b000SEvgeniy Ivanov * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26*58a2b000SEvgeniy Ivanov * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27*58a2b000SEvgeniy Ivanov * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28*58a2b000SEvgeniy Ivanov * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29*58a2b000SEvgeniy Ivanov * SUCH DAMAGE.
30*58a2b000SEvgeniy Ivanov *
31*58a2b000SEvgeniy Ivanov * @(#)disklabel.c 8.1 (Berkeley) 6/11/93
32*58a2b000SEvgeniy Ivanov */
33*58a2b000SEvgeniy Ivanov
34*58a2b000SEvgeniy Ivanov #include <sys/param.h>
35*58a2b000SEvgeniy Ivanov #include <sys/disklabel.h>
36*58a2b000SEvgeniy Ivanov #include "stand.h"
37*58a2b000SEvgeniy Ivanov
38*58a2b000SEvgeniy Ivanov
39*58a2b000SEvgeniy Ivanov #if defined(LIBSA_NO_DISKLABEL_MSGS)
40*58a2b000SEvgeniy Ivanov #define nolabel (char *)1
41*58a2b000SEvgeniy Ivanov #define corruptedlabel (char *)1
42*58a2b000SEvgeniy Ivanov #else
43*58a2b000SEvgeniy Ivanov static char nolabel[] = "no disk label";
44*58a2b000SEvgeniy Ivanov static char corruptedlabel[] = "disk label corrupted";
45*58a2b000SEvgeniy Ivanov #endif
46*58a2b000SEvgeniy Ivanov
47*58a2b000SEvgeniy Ivanov char *
getdisklabel(const char * buf,struct disklabel * lp)48*58a2b000SEvgeniy Ivanov getdisklabel(const char *buf, struct disklabel *lp)
49*58a2b000SEvgeniy Ivanov {
50*58a2b000SEvgeniy Ivanov const struct disklabel *dlp, *elp;
51*58a2b000SEvgeniy Ivanov char *msg = NULL;
52*58a2b000SEvgeniy Ivanov
53*58a2b000SEvgeniy Ivanov elp = (const void *)(buf + DEV_BSIZE - sizeof(*dlp));
54*58a2b000SEvgeniy Ivanov for (dlp = (const void *)buf; dlp <= elp;
55*58a2b000SEvgeniy Ivanov dlp = (const void *)((const char *)dlp + sizeof(long))) {
56*58a2b000SEvgeniy Ivanov if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
57*58a2b000SEvgeniy Ivanov if (msg == NULL)
58*58a2b000SEvgeniy Ivanov msg = nolabel;
59*58a2b000SEvgeniy Ivanov } else if (dlp->d_npartitions > MAXPARTITIONS ||
60*58a2b000SEvgeniy Ivanov dkcksum(dlp) != 0) {
61*58a2b000SEvgeniy Ivanov msg = corruptedlabel;
62*58a2b000SEvgeniy Ivanov } else {
63*58a2b000SEvgeniy Ivanov (void)memcpy(lp, dlp, sizeof *lp);
64*58a2b000SEvgeniy Ivanov msg = NULL;
65*58a2b000SEvgeniy Ivanov break;
66*58a2b000SEvgeniy Ivanov }
67*58a2b000SEvgeniy Ivanov }
68*58a2b000SEvgeniy Ivanov return msg;
69*58a2b000SEvgeniy Ivanov }
70