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