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roll.c revision 1.4 
      1 /*
      2  * Copyright (c) 1980 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 /*static char sccsid[] = "from: @(#)roll.c	5.6 (Berkeley) 9/29/92";*/
     36 static char rcsid[] = "$Id: roll.c,v 1.4 1993/08/07 08:28:06 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 #include <stdlib.h>
     40 
     41 /*
     42  *	This routine rolls ndie nside-sided dice.
     43  */
     44 
     45 # define	reg	register
     46 
     47 # if defined(pdp11)
     48 # define	MAXRAND	32767L
     49 
     50 roll(ndie, nsides)
     51 int	ndie, nsides; {
     52 
     53 	reg long	tot;
     54 	reg unsigned	n, r;
     55 
     56 	tot = 0;
     57 	n = ndie;
     58 	while (n--)
     59 		tot += rand();
     60 	return (int) ((tot * (long) nsides) / ((long) MAXRAND + 1)) + ndie;
     61 }
     62 
     63 # else
     64 
     65 roll(ndie, nsides)
     66 reg int	ndie, nsides; {
     67 
     68 	reg int		tot, r;
     69 	reg double	num_sides;
     70 
     71 	num_sides = nsides;
     72 	tot = 0;
     73 	while (ndie--)
     74 		tot += (r = rand()) * (num_sides / RAND_MAX) + 1;
     75 	return tot;
     76 }
     77 # endif
     78