1 /* $NetBSD: disklabel_scan.c,v 1.1 2002/10/12 20:53:15 elric 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __COPYRIGHT( 42 "@(#) Copyright (c) 2002\ 43 The NetBSD Foundation, Inc. All rights reserved."); 44 __RCSID("$NetBSD: disklabel_scan.c,v 1.1 2002/10/12 20:53:15 elric Exp $"); 45 #endif 46 47 #include <string.h> 48 #include <unistd.h> 49 #include <util.h> 50 51 #include <sys/disklabel.h> 52 53 #define SCAN_INCR 4 54 55 int 56 disklabel_scan(struct disklabel *lp, char *buf, size_t buflen) 57 { 58 int i; 59 60 /* scan for the correct magic numbers. */ 61 62 for (i=0; i <= buflen - sizeof(*lp); i += SCAN_INCR) { 63 memcpy(lp, buf + i, sizeof(*lp)); 64 if (lp->d_magic == DISKMAGIC && lp->d_magic2 == DISKMAGIC) 65 goto sanity; 66 } 67 68 return 1; 69 70 sanity: 71 /* we've found something, let's sanity check it */ 72 if (lp->d_npartitions > MAXPARTITIONS || disklabel_dkcksum(lp)) 73 return 1; 74 75 return 0; 76 } 77