NetBSD/lib/libutil/disklabel_scan.c

70 lines
2.3 KiB
C

/* $NetBSD: disklabel_scan.c,v 1.3 2009/01/18 12:13:03 lukem Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Roland C. Dowdeswell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT(
"@(#) Copyright (c) 2002\
The NetBSD Foundation, Inc. All rights reserved.");
__RCSID("$NetBSD: disklabel_scan.c,v 1.3 2009/01/18 12:13:03 lukem Exp $");
#endif
#include <string.h>
#include <unistd.h>
#include <util.h>
#include <sys/disklabel.h>
#define SCAN_INCR 4
int
disklabel_scan(struct disklabel *lp, char *buf, size_t buflen)
{
size_t i;
/* scan for the correct magic numbers. */
for (i=0; i <= buflen - sizeof(*lp); i += SCAN_INCR) {
memcpy(lp, buf + i, sizeof(*lp));
if (lp->d_magic == DISKMAGIC && lp->d_magic2 == DISKMAGIC)
goto sanity;
}
return 1;
sanity:
/* we've found something, let's sanity check it */
if (lp->d_npartitions > MAXPARTITIONS || disklabel_dkcksum(lp))
return 1;
return 0;
}