games/backgammon/common_source/check.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  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  * @(#)check.c  8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/backgammon/common_source/check.c,v 1.4 1999/11/30 03:48:25 billf Exp $
  35  * $DragonFly: src/games/backgammon/common_source/check.c,v 1.3 2006/08/08 16:36:11 pavalos Exp $
  36  */
  37
  38 #include "back.h"
  39
  40 void
  41 getmove(void)
  42 {
  43         int     i, c;
  44
  45         c = 0;
  46         for (;;)  {
  47                 i = checkmove(c);
  48
  49                 switch (i)  {
  50                 case -1:
  51                         if (movokay(mvlim))  {
  52                                 if (tflag)
  53                                         curmove (20,0);
  54                                 else
  55                                         writec ('\n');
  56                                 for (i = 0; i < mvlim; i++)
  57                                         if (h[i])
  58                                                 wrhit(g[i]);
  59                                 nexturn();
  60                                 if (*offopp == 15)
  61                                         cturn *= -2;
  62                                 if (tflag && pnum)
  63                                         bflag = pnum;
  64                                 return;
  65                         }
  66
  67                 case -4:
  68                 case 0:
  69                         if (tflag)
  70                                 refresh();
  71                         if (i != 0 && i != -4)
  72                                 break;
  73                         if (tflag)
  74                                 curmove (20,0);
  75                         else
  76                                 writec ('\n');
  77                         writel (*Colorptr);
  78                         if (i == -4)
  79                                 writel (" must make ");
  80                         else
  81                                 writel (" can only make ");
  82                         writec (mvlim+'0');
  83                         writel (" move");
  84                         if (mvlim > 1)
  85                                 writec ('s');
  86                         writec ('.');
  87                         writec ('\n');
  88                         break;
  89
  90                 case -3:
  91                         if (quit())
  92                                 return;
  93                 }
  94
  95                 if (! tflag)
  96                         proll ();
  97                 else  {
  98                         curmove (cturn == -1? 18: 19,39);
  99                         cline ();
 100                         c = -1;
 101                 }
 102         }
 103 }
 104
 105 int
 106 movokay(int mv)
 107 {
 108         int     i, m;
 109
 110         if (d0)
 111                 swap;
 112
 113         for (i = 0; i < mv; i++)  {
 114
 115                 if (p[i] == g[i])  {
 116                         moverr (i);
 117                         curmove (20,0);
 118                         writel ("Attempt to move to same location.\n");
 119                         return (0);
 120                 }
 121
 122                 if (cturn*(g[i]-p[i]) < 0)  {
 123                         moverr (i);
 124                         curmove (20,0);
 125                         writel ("Backwards move.\n");
 126                         return (0);
 127                 }
 128
 129                 if (abs(board[bar]) && p[i] != bar)  {
 130                         moverr (i);
 131                         curmove (20,0);
 132                         writel ("Men still on bar.\n");
 133                         return (0);
 134                 }
 135
 136                 if ( (m = makmove(i)) )  {
 137                         moverr (i);
 138                         switch (m)  {
 139
 140                         case 1:
 141                                 writel ("Move not rolled.\n");
 142                                 break;
 143
 144                         case 2:
 145                                 writel ("Bad starting position.\n");
 146                                 break;
 147
 148                         case 3:
 149                                 writel ("Destination occupied.\n");
 150                                 break;
 151
 152                         case 4:
 153                                 writel ("Can't remove men yet.\n");
 154                         }
 155                         return (0);
 156                 }
 157         }
 158         return (1);
 159 }