backgammon/common_source/one.c

   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: @(#)one.c       5.4 (Berkeley) 6/1/90";*/
  36 static char rcsid[] = "$Id: one.c,v 1.2 1993/08/01 18:56:39 mycroft Exp $";
  37 #endif /* not lint */
  38
  39 #include "back.h"
  40
  41 makmove (i)
  42 register int    i;
  43
  44 {
  45         register int    n, d;
  46         int             max;
  47
  48         d = d0;
  49         n = abs(g[i]-p[i]);
  50         max = (*offptr < 0? 7: last());
  51         if (board[p[i]]*cturn <= 0)
  52                 return (checkd(d)+2);
  53         if (g[i] != home && board[g[i]]*cturn < -1)
  54                 return (checkd(d)+3);
  55         if (i || D0 == D1)  {
  56                 if (n == max? D1 < n: D1 != n)
  57                         return (checkd(d)+1);
  58         } else  {
  59                 if (n == max? D0 < n && D1 < n: D0 != n && D1 != n)
  60                         return (checkd(d)+1);
  61                 if (n == max? D0 < n: D0 != n)  {
  62                         if (d0)
  63                                 return (checkd(d)+1);
  64                         swap;
  65                 }
  66         }
  67         if (g[i] == home && *offptr < 0)
  68                 return (checkd(d)+4);
  69         h[i] = 0;
  70         board[p[i]] -= cturn;
  71         if (g[i] != home)  {
  72                 if (board[g[i]] == -cturn)  {
  73                         board[home] -= cturn;
  74                         board[g[i]] = 0;
  75                         h[i] = 1;
  76                         if (abs(bar-g[i]) < 7)  {
  77                                 (*inopp)--;
  78                                 if (*offopp >= 0)
  79                                         *offopp -= 15;
  80                         }
  81                 }
  82                 board[g[i]] += cturn;
  83                 if (abs(home-g[i]) < 7 && abs(home-p[i]) > 6)  {
  84                         (*inptr)++;
  85                         if (*inptr+*offptr == 0)
  86                                 *offptr += 15;
  87                 }
  88         } else {
  89                 (*offptr)++;
  90                 (*inptr)--;
  91         }
  92         return (0);
  93 }
  94 \f
  95 moverr (i)
  96 register int    i;
  97
  98 {
  99         register int    j;
 100
 101         if (tflag)
 102                 curmove (20,0);
 103         else
 104                 writec ('\n');
 105         writel ("Error:  ");
 106         for (j = 0; j <= i; j++)  {
 107                 wrint (p[j]);
 108                 writec ('-');
 109                 wrint (g[j]);
 110                 if (j < i)
 111                         writec (',');
 112         }
 113         writel ("... ");
 114         movback (i);
 115 }
 116
 117
 118 checkd (d)
 119 register int    d;
 120
 121 {
 122         if (d0 != d)
 123                 swap;
 124         return (0);
 125 }
 126
 127 last ()  {
 128         register int    i;
 129
 130         for (i = home-6*cturn; i != home; i += cturn)
 131                 if (board[i]*cturn > 0)
 132                         return (abs(home-i));
 133 }
 134 \f
 135 movback (i)
 136 register int    i;
 137
 138 {
 139         register int    j;
 140
 141         for (j = i-1; j >= 0; j--)
 142                 backone(j);
 143 }
 144
 145 backone (i)
 146 register int    i;
 147
 148 {
 149         board[p[i]] += cturn;
 150         if (g[i] != home)  {
 151                 board[g[i]] -= cturn;
 152                 if (abs(g[i]-home) < 7 && abs(p[i]-home) > 6)  {
 153                         (*inptr)--;
 154                         if (*inptr+*offptr < 15 && *offptr >= 0)
 155                                 *offptr -= 15;
 156                 }
 157         } else  {
 158                 (*offptr)--;
 159                 (*inptr)++;
 160         }
 161         if (h[i])  {
 162                 board[home] += cturn;
 163                 board[g[i]] = -cturn;
 164                 if (abs(bar-g[i]) < 7)  {
 165                         (*inopp)++;
 166                         if (*inopp+*offopp == 0)
 167                                 *offopp += 15;
 168                 }
 169         }
 170 }