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roll.c revision 1.9 
      1 /*	$NetBSD: roll.c,v 1.9 2003/08/07 09:37:29 agc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1980, 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 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)roll.c	8.1 (Berkeley) 5/31/93";
     36 #else
     37 __RCSID("$NetBSD: roll.c,v 1.9 2003/08/07 09:37:29 agc Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include "monop.ext"
     42 #include <stdlib.h>
     43 
     44 /*
     45  *	This routine rolls ndie nside-sided dice.
     46  */
     47 
     48 #if defined(pdp11)
     49 #define	MAXRAND	32767L
     50 
     51 int
     52 roll(ndie, nsides)
     53 	int ndie, nsides;
     54 {
     55 	long tot;
     56 	unsigned n, r;
     57 
     58 	tot = 0;
     59 	n = ndie;
     60 	while (n--)
     61 		tot += rand();
     62 	return (int) ((tot * (long) nsides) / ((long) MAXRAND + 1)) + ndie;
     63 }
     64 
     65 #else
     66 
     67 int
     68 roll(ndie, nsides)
     69 	int ndie, nsides;
     70 {
     71 	int tot, r;
     72 	double num_sides;
     73 
     74 	num_sides = nsides;
     75 	tot = 0;
     76 	while (ndie--)
     77 		tot += (r = rand()) * (num_sides / RAND_MAX) + 1;
     78 	return tot;
     79 }
     80 #endif
     81