disklabel.c revision 1.2.2.2
1 1.2.2.2 brezak /*- 2 1.2.2.2 brezak * Copyright (c) 1993 3 1.2.2.2 brezak * The Regents of the University of California. All rights reserved. 4 1.2.2.2 brezak * 5 1.2.2.2 brezak * Redistribution and use in source and binary forms, with or without 6 1.2.2.2 brezak * modification, are permitted provided that the following conditions 7 1.2.2.2 brezak * are met: 8 1.2.2.2 brezak * 1. Redistributions of source code must retain the above copyright 9 1.2.2.2 brezak * notice, this list of conditions and the following disclaimer. 10 1.2.2.2 brezak * 2. Redistributions in binary form must reproduce the above copyright 11 1.2.2.2 brezak * notice, this list of conditions and the following disclaimer in the 12 1.2.2.2 brezak * documentation and/or other materials provided with the distribution. 13 1.2.2.2 brezak * 3. All advertising materials mentioning features or use of this software 14 1.2.2.2 brezak * must display the following acknowledgement: 15 1.2.2.2 brezak * This product includes software developed by the University of 16 1.2.2.2 brezak * California, Berkeley and its contributors. 17 1.2.2.2 brezak * 4. Neither the name of the University nor the names of its contributors 18 1.2.2.2 brezak * may be used to endorse or promote products derived from this software 19 1.2.2.2 brezak * without specific prior written permission. 20 1.2.2.2 brezak * 21 1.2.2.2 brezak * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 1.2.2.2 brezak * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 1.2.2.2 brezak * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 1.2.2.2 brezak * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 1.2.2.2 brezak * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 1.2.2.2 brezak * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 1.2.2.2 brezak * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 1.2.2.2 brezak * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 1.2.2.2 brezak * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 1.2.2.2 brezak * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 1.2.2.2 brezak * SUCH DAMAGE. 32 1.2.2.2 brezak * 33 1.2.2.2 brezak * from: @(#)disklabel.c 8.1 (Berkeley) 6/11/93 34 1.2.2.2 brezak * $Id: disklabel.c,v 1.2.2.2 1994/08/22 21:56:03 brezak Exp $ 35 1.2.2.2 brezak */ 36 1.2.2.2 brezak 37 1.2.2.2 brezak #include <sys/param.h> 38 1.2.2.2 brezak #include <sys/disklabel.h> 39 1.2.2.2 brezak 40 1.2.2.2 brezak int dkcksum __P((struct disklabel *)); 41 1.2.2.2 brezak 42 1.2.2.2 brezak char * 43 1.2.2.2 brezak getdisklabel(buf, lp) 44 1.2.2.2 brezak const char *buf; 45 1.2.2.2 brezak struct disklabel *lp; 46 1.2.2.2 brezak { 47 1.2.2.2 brezak struct disklabel *dlp, *elp; 48 1.2.2.2 brezak char *msg = (char *)0; 49 1.2.2.2 brezak 50 1.2.2.2 brezak elp = (struct disklabel *)(buf + DEV_BSIZE - sizeof(*dlp)); 51 1.2.2.2 brezak for (dlp = (struct disklabel *)buf; dlp <= elp; 52 1.2.2.2 brezak dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { 53 1.2.2.2 brezak if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { 54 1.2.2.2 brezak if (msg == (char *)0) 55 1.2.2.2 brezak msg = "no disk label"; 56 1.2.2.2 brezak } else if (dlp->d_npartitions > MAXPARTITIONS || 57 1.2.2.2 brezak dkcksum(dlp) != 0) 58 1.2.2.2 brezak msg = "disk label corrupted"; 59 1.2.2.2 brezak else { 60 1.2.2.2 brezak *lp = *dlp; 61 1.2.2.2 brezak msg = (char *)0; 62 1.2.2.2 brezak break; 63 1.2.2.2 brezak } 64 1.2.2.2 brezak } 65 1.2.2.2 brezak return (msg); 66 1.2.2.2 brezak } 67 1.2.2.2 brezak 68 1.2.2.2 brezak /* 69 1.2.2.2 brezak * Compute checksum for disk label. 70 1.2.2.2 brezak */ 71 1.2.2.2 brezak int 72 1.2.2.2 brezak dkcksum(lp) 73 1.2.2.2 brezak register struct disklabel *lp; 74 1.2.2.2 brezak { 75 1.2.2.2 brezak register u_short *start, *end; 76 1.2.2.2 brezak register u_short sum = 0; 77 1.2.2.2 brezak 78 1.2.2.2 brezak start = (u_short *)lp; 79 1.2.2.2 brezak end = (u_short *)&lp->d_partitions[lp->d_npartitions]; 80 1.2.2.2 brezak while (start < end) 81 1.2.2.2 brezak sum ^= *start++; 82 1.2.2.2 brezak return (sum); 83 1.2.2.2 brezak } 84
Indexes created Thu Oct 09 07:10:06 GMT 2025