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dkcksum.c revision 1.6 
      1  1.6      cgd /*	$NetBSD: dkcksum.c,v 1.6 1995/03/18 14:54:42 cgd Exp $	*/
      2  1.6      cgd 
      3  1.1      cgd /*-
      4  1.5  mycroft  * Copyright (c) 1991, 1993
      5  1.5  mycroft  *	The Regents of the University of California.  All rights reserved.
      6  1.1      cgd  *
      7  1.1      cgd  * Redistribution and use in source and binary forms, with or without
      8  1.1      cgd  * modification, are permitted provided that the following conditions
      9  1.1      cgd  * are met:
     10  1.1      cgd  * 1. Redistributions of source code must retain the above copyright
     11  1.1      cgd  *    notice, this list of conditions and the following disclaimer.
     12  1.1      cgd  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1      cgd  *    notice, this list of conditions and the following disclaimer in the
     14  1.1      cgd  *    documentation and/or other materials provided with the distribution.
     15  1.1      cgd  * 3. All advertising materials mentioning features or use of this software
     16  1.1      cgd  *    must display the following acknowledgement:
     17  1.1      cgd  *	This product includes software developed by the University of
     18  1.1      cgd  *	California, Berkeley and its contributors.
     19  1.1      cgd  * 4. Neither the name of the University nor the names of its contributors
     20  1.1      cgd  *    may be used to endorse or promote products derived from this software
     21  1.1      cgd  *    without specific prior written permission.
     22  1.1      cgd  *
     23  1.1      cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  1.1      cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  1.1      cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  1.1      cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  1.1      cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  1.1      cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  1.1      cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  1.1      cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  1.1      cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  1.1      cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  1.1      cgd  * SUCH DAMAGE.
     34  1.1      cgd  */
     35  1.1      cgd 
     36  1.1      cgd #ifndef lint
     37  1.6      cgd #if 0
     38  1.6      cgd static char sccsid[] = "@(#)dkcksum.c	8.1 (Berkeley) 6/5/93";
     39  1.6      cgd #else
     40  1.6      cgd static char rcsid[] = "$NetBSD: dkcksum.c,v 1.6 1995/03/18 14:54:42 cgd Exp $";
     41  1.6      cgd #endif
     42  1.1      cgd #endif /* not lint */
     43  1.1      cgd 
     44  1.1      cgd #include <sys/types.h>
     45  1.1      cgd #include <sys/disklabel.h>
     46  1.1      cgd 
     47  1.1      cgd u_short
     48  1.1      cgd dkcksum(lp)
     49  1.1      cgd 	register struct disklabel *lp;
     50  1.1      cgd {
     51  1.1      cgd 	register u_short *start, *end;
     52  1.1      cgd 	register u_short sum = 0;
     53  1.1      cgd 
     54  1.1      cgd 	start = (u_short *)lp;
     55  1.1      cgd 	end = (u_short *)&lp->d_partitions[lp->d_npartitions];
     56  1.1      cgd 	while (start < end)
     57  1.1      cgd 		sum ^= *start++;
     58  1.1      cgd 	return (sum);
     59  1.1      cgd }
     60