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      1 /*	$NetBSD: stoc.c,v 1.21 2022/05/29 00:12:11 rillig Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Ralph Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 /*	@(#)stoc.c	8.1 (Berkeley) 7/24/94	*/
     37 __RCSID("$NetBSD: stoc.c,v 1.21 2022/05/29 00:12:11 rillig Exp $");
     38 
     39 #include <ctype.h>
     40 #include <stdlib.h>
     41 #include <string.h>
     42 #include "gomoku.h"
     43 
     44 const char	letters[]	= "<ABCDEFGHJKLMNOPQRST>";
     45 
     46 
     47 /*
     48  * Turn the spot number form of a move into the character form.
     49  */
     50 const char *
     51 stoc(spot_index s)
     52 {
     53 	static char buf[32];
     54 
     55 	if (s == RESIGN)
     56 		return "resign";
     57 	if (s == SAVE)
     58 		return "save";
     59 	snprintf(buf, sizeof(buf), "%c%d",
     60 	    letters[s % (BSZ + 1)], s / (BSZ + 1));
     61 	return buf;
     62 }
     63 
     64 /*
     65  * Turn the character form of a move into the spot number form.
     66  */
     67 spot_index
     68 ctos(const char *mp)
     69 {
     70 
     71 	if (strcmp(mp, "resign") == 0 || strcmp(mp, "quit") == 0)
     72 		return RESIGN;
     73 	if (strcmp(mp, "save") == 0)
     74 		return SAVE;
     75 
     76 	int letter = toupper((unsigned char)mp[0]);
     77 	int x = 1;
     78 	while (x <= BSZ && letters[x] != letter)
     79 		x++;
     80 	if (x > BSZ)
     81 		return ILLEGAL;
     82 
     83 	int y = atoi(&mp[1]);
     84 	if (y < 1 || y > 19)
     85 		return ILLEGAL;
     86 
     87 	return PT(x, y);
     88 }
     89