backgammon/common_source/check.c

   1 /*      $NetBSD: check.c,v 1.4 1997/10/10 08:59:44 lukem 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[] = "@(#)check.c     8.1 (Berkeley) 5/31/93";
  40 #else
  41 __RCSID("$NetBSD: check.c,v 1.4 1997/10/10 08:59:44 lukem Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include "back.h"
  46
  47 void
  48 getmove()
  49 {
  50         int     i, c;
  51
  52         c = 0;
  53         for (;;) {
  54                 i = checkmove(c);
  55
  56                 switch (i) {
  57                 case -1:
  58                         if (movokay(mvlim)) {
  59                                 if (tflag)
  60                                         curmove(20, 0);
  61                                 else
  62                                         writec('\n');
  63                                 for (i = 0; i < mvlim; i++)
  64                                         if (h[i])
  65                                                 wrhit(g[i]);
  66                                 nexturn();
  67                                 if (*offopp == 15)
  68                                         cturn *= -2;
  69                                 if (tflag && pnum)
  70                                         bflag = pnum;
  71                                 return;
  72                         }
  73                 case -4:
  74                 case 0:
  75                         if (tflag)
  76                                 refresh();
  77                         if (i != 0 && i != -4)
  78                                 break;
  79                         if (tflag)
  80                                 curmove(20, 0);
  81                         else
  82                                 writec('\n');
  83                         writel(*Colorptr);
  84                         if (i == -4)
  85                                 writel(" must make ");
  86                         else
  87                                 writel(" can only make ");
  88                         writec(mvlim + '0');
  89                         writel(" move");
  90                         if (mvlim > 1)
  91                                 writec('s');
  92                         writec('.');
  93                         writec('\n');
  94                         break;
  95
  96                 case -3:
  97                         if (quit())
  98                                 return;
  99                 }
 100
 101                 if (!tflag)
 102                         proll();
 103                 else {
 104                         curmove(cturn == -1 ? 18 : 19, 39);
 105                         cline();
 106                         c = -1;
 107                 }
 108         }
 109 }
 110
 111 int
 112 movokay(mv)
 113         int     mv;
 114 {
 115         int     i, m;
 116
 117         if (d0)
 118                 swap;
 119
 120         for (i = 0; i < mv; i++) {
 121                 if (p[i] == g[i]) {
 122                         moverr(i);
 123                         curmove(20, 0);
 124                         writel("Attempt to move to same location.\n");
 125                         return (0);
 126                 }
 127                 if (cturn * (g[i] - p[i]) < 0) {
 128                         moverr(i);
 129                         curmove(20, 0);
 130                         writel("Backwards move.\n");
 131                         return (0);
 132                 }
 133                 if (abs(board[bar]) && p[i] != bar) {
 134                         moverr(i);
 135                         curmove(20, 0);
 136                         writel("Men still on bar.\n");
 137                         return (0);
 138                 }
 139                 if ((m = makmove(i))) {
 140                         moverr(i);
 141                         switch (m) {
 142
 143                         case 1:
 144                                 writel("Move not rolled.\n");
 145                                 break;
 146
 147                         case 2:
 148                                 writel("Bad starting position.\n");
 149                                 break;
 150
 151                         case 3:
 152                                 writel("Destination occupied.\n");
 153                                 break;
 154
 155                         case 4:
 156                                 writel("Can't remove men yet.\n");
 157                         }
 158                         return (0);
 159                 }
 160         }
 161         return (1);
 162 }