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disklabel.c revision 1.8 
      1 /*	$NetBSD: disklabel.c,v 1.8 2005/02/26 22:58:56 perry 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