1 /* $NetBSD: disklabel.c,v 1.9 2005/12/11 12:24:46 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)disklabel.c 8.1 (Berkeley) 6/11/93 32 */ 33 34 #include <sys/param.h> 35 #include <sys/disklabel.h> 36 #include "stand.h" 37 38 39 #if defined(LIBSA_NO_DISKLABEL_MSGS) 40 #define nolabel (char *)1 41 #define corruptedlabel (char *)1 42 #else 43 static char nolabel[] = "no disk label"; 44 static char corruptedlabel[] = "disk label corrupted"; 45 #endif 46 char * 47 getdisklabel(buf, lp) 48 const char *buf; 49 struct disklabel *lp; 50 { 51 const struct disklabel *dlp, *elp; 52 char *msg = NULL; 53 54 elp = (const void *)(buf + DEV_BSIZE - sizeof(*dlp)); 55 for (dlp = (const void *)buf; dlp <= elp; 56 dlp = (const void *)((const char *)dlp + sizeof(long))) { 57 if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { 58 if (msg == NULL) 59 msg = nolabel; 60 } else if (dlp->d_npartitions > MAXPARTITIONS || 61 dkcksum(dlp) != 0) 62 msg = corruptedlabel; 63 else { 64 (void)memcpy(lp, dlp, sizeof *lp); 65 msg = NULL; 66 break; 67 } 68 } 69 return msg; 70 } 71