backgammon/common_source/check.c

   1 /*      $NetBSD: check.c,v 1.9 2019/02/18 19:35:44 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. 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[] = "@(#)check.c     8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: check.c,v 1.9 2019/02/18 19:35:44 christos Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include "back.h"
  42
  43 void
  44 getmove(struct move *mm)
  45 {
  46         int     i, c;
  47
  48         c = 0;
  49         for (;;) {
  50                 i = checkmove(mm, c);
  51
  52                 switch (i) {
  53                 case -1:
  54                         if (movokay(mm, mm->mvlim)) {
  55                                 if (tflag)
  56                                         curmove(20, 0);
  57                                 else
  58                                         writec('\n');
  59                                 for (i = 0; i < mm->mvlim; i++)
  60                                         if (mm->h[i])
  61                                                 wrhit(mm->g[i]);
  62                                 nexturn();
  63                                 if (*offopp == 15)
  64                                         cturn *= -2;
  65                                 if (tflag && pnum)
  66                                         bflag = pnum;
  67                                 return;
  68                         }
  69                         /*FALLTHROUGH*/
  70                 case -4:
  71                 case 0:
  72                         if (tflag)
  73                                 refresh();
  74                         if (i != 0 && i != -4)
  75                                 break;
  76                         if (tflag)
  77                                 curmove(20, 0);
  78                         else
  79                                 writec('\n');
  80                         writel(*Colorptr);
  81                         if (i == -4)
  82                                 writel(" must make ");
  83                         else
  84                                 writel(" can only make ");
  85                         writec(mm->mvlim + '0');
  86                         writel(" move");
  87                         if (mm->mvlim > 1)
  88                                 writec('s');
  89                         writec('.');
  90                         writec('\n');
  91                         break;
  92
  93                 case -3:
  94                         if (quit(mm))
  95                                 return;
  96                 }
  97
  98                 if (!tflag)
  99                         proll(mm);
 100                 else {
 101                         curmove(cturn == -1 ? 18 : 19, 39);
 102                         cline();
 103                         c = -1;
 104                 }
 105         }
 106 }
 107
 108 int
 109 movokay(struct move *mm, int mv)
 110 {
 111         int     i, m;
 112
 113         if (mm->d0)
 114                 mswap(mm);
 115
 116         for (i = 0; i < mv; i++) {
 117                 if (mm->p[i] == mm->g[i]) {
 118                         moverr(mm, i);
 119                         curmove(20, 0);
 120                         writel("Attempt to move to same location.\n");
 121                         return (0);
 122                 }
 123                 if (cturn * (mm->g[i] - mm->p[i]) < 0) {
 124                         moverr(mm, i);
 125                         curmove(20, 0);
 126                         writel("Backwards move.\n");
 127                         return (0);
 128                 }
 129                 if (abs(board[bar]) && mm->p[i] != bar) {
 130                         moverr(mm, i);
 131                         curmove(20, 0);
 132                         writel("Men still on bar.\n");
 133                         return (0);
 134                 }
 135                 if ((m = makmove(mm, i))) {
 136                         moverr(mm, i);
 137                         switch (m) {
 138
 139                         case 1:
 140                                 writel("Move not rolled.\n");
 141                                 break;
 142
 143                         case 2:
 144                                 writel("Bad starting position.\n");
 145                                 break;
 146
 147                         case 3:
 148                                 writel("Destination occupied.\n");
 149                                 break;
 150
 151                         case 4:
 152                                 writel("Can't remove men yet.\n");
 153                         }
 154                         return (0);
 155                 }
 156         }
 157         return (1);
 158 }