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      1 /*	$NetBSD: disklabel.c,v 1.12 2021/05/26 04:28:15 mrg 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 <lib/libkern/libkern.h>
     37 #include "stand.h"
     38 
     39 
     40 #if defined(LIBSA_NO_DISKLABEL_MSGS)
     41 #define nolabel (char *)1
     42 #define corruptedlabel (char *)1
     43 #else
     44 static char nolabel[] = "no disk label";
     45 static char corruptedlabel[] = "disk label corrupted";
     46 #endif
     47 
     48 char *
     49 getdisklabel(const char *buf, 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 defined(LIBSA_DISKLABEL_EI)
     58 		if (dlp->d_magic == bswap32(DISKMAGIC) &&
     59 		    dlp->d_magic2 == bswap32(DISKMAGIC)) {
     60 			disklabel_swap(__UNCONST(dlp), __UNCONST(dlp));
     61 		}
     62 #endif
     63 		if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
     64 			if (msg == NULL)
     65 				msg = nolabel;
     66 		} else if (dlp->d_npartitions > MAXPARTITIONS ||
     67 			   dkcksum(dlp) != 0) {
     68 			msg = corruptedlabel;
     69 		} else {
     70 			(void)memcpy(lp, dlp, sizeof *lp);
     71 			msg = NULL;
     72 			break;
     73 		}
     74 	}
     75 	return msg;
     76 }
     77