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check.c revision 1.7 
      1 /*	$NetBSD: check.c,v 1.7 2012/10/13 18:44:15 dholland 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 1.7 2012/10/13 18:44:15 dholland Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include "back.h"
     42 
     43 void
     44 getmove(void)
     45 {
     46 	int     i, c;
     47 	struct move *mm = &gm;
     48 
     49 	c = 0;
     50 	for (;;) {
     51 		i = checkmove(c);
     52 
     53 		switch (i) {
     54 		case -1:
     55 			if (movokay(mm->mvlim)) {
     56 				if (tflag)
     57 					curmove(20, 0);
     58 				else
     59 					writec('\n');
     60 				for (i = 0; i < mm->mvlim; i++)
     61 					if (mm->h[i])
     62 						wrhit(mm->g[i]);
     63 				nexturn();
     64 				if (*offopp == 15)
     65 					cturn *= -2;
     66 				if (tflag && pnum)
     67 					bflag = pnum;
     68 				return;
     69 			}
     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())
     95 				return;
     96 		}
     97 
     98 		if (!tflag)
     99 			proll();
    100 		else {
    101 			curmove(cturn == -1 ? 18 : 19, 39);
    102 			cline();
    103 			c = -1;
    104 		}
    105 	}
    106 }
    107 
    108 int
    109 movokay(int mv)
    110 {
    111 	int     i, m;
    112 	struct move *mm = &gm;
    113 
    114 	if (mm->d0)
    115 		mswap(mm);
    116 
    117 	for (i = 0; i < mv; i++) {
    118 		if (mm->p[i] == mm->g[i]) {
    119 			moverr(i);
    120 			curmove(20, 0);
    121 			writel("Attempt to move to same location.\n");
    122 			return (0);
    123 		}
    124 		if (cturn * (mm->g[i] - mm->p[i]) < 0) {
    125 			moverr(i);
    126 			curmove(20, 0);
    127 			writel("Backwards move.\n");
    128 			return (0);
    129 		}
    130 		if (abs(board[bar]) && mm->p[i] != bar) {
    131 			moverr(i);
    132 			curmove(20, 0);
    133 			writel("Men still on bar.\n");
    134 			return (0);
    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 }
    160