monop/roll.c

   1 /*      $NetBSD: roll.c,v 1.6 1997/10/12 17:45:25 christos 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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 #if 0
  39 static char sccsid[] = "@(#)roll.c      8.1 (Berkeley) 5/31/93";
  40 #else
  41 __RCSID("$NetBSD: roll.c,v 1.6 1997/10/12 17:45:25 christos Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include "monop.ext"
  46 #include <stdlib.h>
  47
  48 /*
  49  *      This routine rolls ndie nside-sided dice.
  50  */
  51
  52 # define        reg     register
  53
  54 # if defined(pdp11)
  55 # define        MAXRAND 32767L
  56
  57 int
  58 roll(ndie, nsides)
  59 int     ndie, nsides;
  60 {
  61
  62         long    tot;
  63         unsigned        n, r;
  64
  65         tot = 0;
  66         n = ndie;
  67         while (n--)
  68                 tot += rand();
  69         return (int) ((tot * (long) nsides) / ((long) MAXRAND + 1)) + ndie;
  70 }
  71
  72 # else
  73
  74 int
  75 roll(ndie, nsides)
  76 int     ndie, nsides; {
  77
  78         int             tot, r;
  79         double  num_sides;
  80
  81         num_sides = nsides;
  82         tot = 0;
  83         while (ndie--)
  84                 tot += (r = rand()) * (num_sides / RAND_MAX) + 1;
  85         return tot;
  86 }
  87 # endif