1/* $NetBSD: disklabel_scan.c,v 1.2 2008/04/28 20:23:02 martin Exp $ */
2
3/*-
4 * Copyright (c) 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Roland C. Dowdeswell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT(
35"@(#) Copyright (c) 2002\
36	The NetBSD Foundation, Inc.  All rights reserved.");
37__RCSID("$NetBSD: disklabel_scan.c,v 1.2 2008/04/28 20:23:02 martin Exp $");
38#endif
39
40#include <string.h>
41#include <unistd.h>
42#include <util.h>
43
44#include <sys/disklabel.h>
45
46#define SCAN_INCR	4
47
48int
49disklabel_scan(struct disklabel *lp, char *buf, size_t buflen)
50{
51	size_t	i;
52
53	/* scan for the correct magic numbers. */
54
55	for (i=0; i <= buflen - sizeof(*lp); i += SCAN_INCR) {
56		memcpy(lp, buf + i, sizeof(*lp));
57		if (lp->d_magic == DISKMAGIC && lp->d_magic2 == DISKMAGIC)
58			goto sanity;
59	}
60
61	return 1;
62
63sanity:
64	/* we've found something, let's sanity check it */
65	if (lp->d_npartitions > MAXPARTITIONS || disklabel_dkcksum(lp))
66		return 1;
67
68	return 0;
69}
70