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Annotation of sys/lib/libsa/disklabel.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: disklabel.c,v 1.5 2003/08/11 06:23:09 deraadt Exp $   */
                      2: /*     $NetBSD: disklabel.c,v 1.3 1994/10/26 05:44:42 cgd Exp $        */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  *
                     32:  *     @(#)disklabel.c 8.1 (Berkeley) 6/11/93
                     33:  */
                     34:
                     35: #include <sys/param.h>
                     36: #include <sys/disklabel.h>
                     37: #include "stand.h"
                     38:
                     39: char *
                     40: getdisklabel(const char *buf, struct disklabel *lp)
                     41: {
                     42:        struct disklabel *dlp, *elp;
                     43:        char *msg = NULL;
                     44:
                     45:        elp = (struct disklabel *)(buf + DEV_BSIZE - sizeof(*dlp));
                     46:        for (dlp = (struct disklabel *)buf; dlp <= elp;
                     47:            dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
                     48:                if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
                     49:                        if (msg == NULL)
                     50:                                msg = "no disk label";
                     51:                } else if (dlp->d_npartitions > MAXPARTITIONS ||
                     52:                           dkcksum(dlp) != 0)
                     53:                        msg = "disk label corrupted";
                     54:                else {
                     55:                        *lp = *dlp;
                     56:                        msg = NULL;
                     57:                        break;
                     58:                }
                     59:        }
                     60:        return (msg);
                     61: }