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disklabel.c revision 1.4 
      1 /*	$NetBSD: disklabel.c,v 1.4 1996/01/13 22:25:36 leo 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)disklabel.c	8.1 (Berkeley) 6/11/93
     36  */
     37 
     38 #include <sys/param.h>
     39 #include <sys/disklabel.h>
     40 #include "stand.h"
     41 
     42 char *
     43 getdisklabel(buf, lp)
     44 	const char *buf;
     45 	struct disklabel *lp;
     46 {
     47 	struct disklabel *dlp, *elp;
     48 	char *msg = (char *)0;
     49 
     50 	elp = (struct disklabel *)(buf + DEV_BSIZE - sizeof(*dlp));
     51 	for (dlp = (struct disklabel *)buf; dlp <= elp;
     52 	    dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
     53 		if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
     54 			if (msg == (char *)0)
     55 				msg = "no disk label";
     56 		} else if (dlp->d_npartitions > MAXPARTITIONS ||
     57 			   dkcksum(dlp) != 0)
     58 			msg = "disk label corrupted";
     59 		else {
     60 			*lp = *dlp;
     61 			msg = (char *)0;
     62 			break;
     63 		}
     64 	}
     65 	return (msg);
     66 }
     67