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