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roll.c revision 1.1 
      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[] = "@(#)roll.c	5.5 (Berkeley) 6/1/90";
     36 #endif /* not lint */
     37 
     38 /*
     39  *	This routine rolls ndie nside-sided dice.
     40  */
     41 
     42 # define	reg	register
     43 
     44 # if !defined(vax) && !defined(tahoe)
     45 # define	MAXRAND	32767L
     46 
     47 roll(ndie, nsides)
     48 int	ndie, nsides; {
     49 
     50 	reg long	tot;
     51 	reg unsigned	n, r;
     52 
     53 	tot = 0;
     54 	n = ndie;
     55 	while (n--)
     56 		tot += rand();
     57 	return (int) ((tot * (long) nsides) / ((long) MAXRAND + 1)) + ndie;
     58 }
     59 
     60 # else
     61 
     62 roll(ndie, nsides)
     63 reg int	ndie, nsides; {
     64 
     65 	reg int		tot, r;
     66 	reg double	num_sides;
     67 
     68 	num_sides = nsides;
     69 	tot = 0;
     70 	while (ndie--)
     71 		tot += (r = rand()) * (num_sides / 017777777777) + 1;
     72 	return tot;
     73 }
     74 # endif
     75