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      1 /*	$NetBSD: one.c,v 1.9 2012/10/13 19:19:39 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[] = "@(#)one.c	8.1 (Berkeley) 5/31/93";
     36 #else
     37 __RCSID("$NetBSD: one.c,v 1.9 2012/10/13 19:19:39 dholland Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include "back.h"
     42 
     43 static int checkd(struct move *, int);
     44 static int last(void);
     45 
     46 int
     47 makmove(struct move *mm, int i)
     48 {
     49 	int     n, d;
     50 	int     max;
     51 
     52 	d = mm->d0;
     53 	n = abs(mm->g[i] - mm->p[i]);
     54 	max = (*offptr < 0 ? 7 : last());
     55 	if (board[mm->p[i]] * cturn <= 0)
     56 		return (checkd(mm, d) + 2);
     57 	if (mm->g[i] != home && board[mm->g[i]] * cturn < -1)
     58 		return (checkd(mm, d) + 3);
     59 	if (i || mm->D0 == mm->D1) {
     60 		if (n == max ? mm->D1 < n : mm->D1 != n)
     61 			return (checkd(mm, d) + 1);
     62 	} else {
     63 		if (n == max ? mm->D0 < n && mm->D1 < n : mm->D0 != n && mm->D1 != n)
     64 			return (checkd(mm, d) + 1);
     65 		if (n == max ? mm->D0 < n : mm->D0 != n) {
     66 			if (mm->d0)
     67 				return (checkd(mm, d) + 1);
     68 			mswap(mm);
     69 		}
     70 	}
     71 	if (mm->g[i] == home && *offptr < 0)
     72 		return (checkd(mm, d) + 4);
     73 	mm->h[i] = 0;
     74 	board[mm->p[i]] -= cturn;
     75 	if (mm->g[i] != home) {
     76 		if (board[mm->g[i]] == -cturn) {
     77 			board[home] -= cturn;
     78 			board[mm->g[i]] = 0;
     79 			mm->h[i] = 1;
     80 			if (abs(bar - mm->g[i]) < 7) {
     81 				(*inopp)--;
     82 				if (*offopp >= 0)
     83 					*offopp -= 15;
     84 			}
     85 		}
     86 		board[mm->g[i]] += cturn;
     87 		if (abs(home - mm->g[i]) < 7 && abs(home - mm->p[i]) > 6) {
     88 			(*inptr)++;
     89 			if (*inptr + *offptr == 0)
     90 				*offptr += 15;
     91 		}
     92 	} else {
     93 		(*offptr)++;
     94 		(*inptr)--;
     95 	}
     96 	return (0);
     97 }
     98 
     99 void
    100 moverr(struct move *mm, int i)
    101 {
    102 	int     j;
    103 
    104 	if (tflag)
    105 		curmove(20, 0);
    106 	else
    107 		writec('\n');
    108 	writel("Error:  ");
    109 	for (j = 0; j <= i; j++) {
    110 		wrint(mm->p[j]);
    111 		writec('-');
    112 		wrint(mm->g[j]);
    113 		if (j < i)
    114 			writec(',');
    115 	}
    116 	writel("... ");
    117 	movback(mm, i);
    118 }
    119 
    120 
    121 static int
    122 checkd(struct move *mm, int d)
    123 {
    124 	if (mm->d0 != d)
    125 		mswap(mm);
    126 	return (0);
    127 }
    128 
    129 static int
    130 last(void)
    131 {
    132 	int     i;
    133 
    134 	for (i = home - 6 * cturn; i != home; i += cturn)
    135 		if (board[i] * cturn > 0)
    136 			return (abs(home - i));
    137 	return (-1);
    138 }
    139 
    140 void
    141 movback(struct move *mm, int i)
    142 {
    143 	int     j;
    144 
    145 	for (j = i - 1; j >= 0; j--)
    146 		backone(mm, j);
    147 }
    148 
    149 void
    150 backone(struct move *mm, int i)
    151 {
    152 	board[mm->p[i]] += cturn;
    153 	if (mm->g[i] != home) {
    154 		board[mm->g[i]] -= cturn;
    155 		if (abs(mm->g[i] - home) < 7 && abs(mm->p[i] - home) > 6) {
    156 			(*inptr)--;
    157 			if (*inptr + *offptr < 15 && *offptr >= 0)
    158 				*offptr -= 15;
    159 		}
    160 	} else {
    161 		(*offptr)--;
    162 		(*inptr)++;
    163 	}
    164 	if (mm->h[i]) {
    165 		board[home] += cturn;
    166 		board[mm->g[i]] = -cturn;
    167 		if (abs(bar - mm->g[i]) < 7) {
    168 			(*inopp)++;
    169 			if (*inopp + *offopp == 0)
    170 				*offopp += 15;
    171 		}
    172 	}
    173 }
    174