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stoc.c revision 1.16 
      1 /*	$NetBSD: stoc.c,v 1.16 2022/05/15 22:56:20 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 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)stoc.c	8.1 (Berkeley) 7/24/94";
     39 #else
     40 __RCSID("$NetBSD: stoc.c,v 1.16 2022/05/15 22:56:20 rillig Exp $");
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include <ctype.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include "gomoku.h"
     48 
     49 const char	*letters	= "<ABCDEFGHJKLMNOPQRST>";
     50 
     51 struct mvstr {
     52 	int	m_code;
     53 	const char	*m_text;
     54 };
     55 static	const struct	mvstr	mv[] = {
     56 	{ RESIGN,	"resign" },
     57 	{ RESIGN,	"quit" },
     58 	{ SAVE,		"save" },
     59 	{ -1,		0 }
     60 };
     61 
     62 static int lton(int);
     63 
     64 
     65 /*
     66  * Turn the spot number form of a move into the character form.
     67  */
     68 const char *
     69 stoc(int s)
     70 {
     71 	static char buf[32];
     72 	int i;
     73 
     74 	for (i = 0; mv[i].m_code >= 0; i++)
     75 		if (s == mv[i].m_code)
     76 			return mv[i].m_text;
     77 	snprintf(buf, sizeof(buf), "%c%d",
     78 	    letters[s % (BSZ + 1)], s / (BSZ + 1));
     79 	return buf;
     80 }
     81 
     82 /*
     83  * Turn the character form of a move into the spot number form.
     84  */
     85 int
     86 ctos(const char *mp)
     87 {
     88 	int i;
     89 
     90 	for (i = 0; mv[i].m_code >= 0; i++)
     91 		if (strcmp(mp, mv[i].m_text) == 0)
     92 			return mv[i].m_code;
     93 	if (!isalpha((unsigned char)mp[0]))
     94 		return ILLEGAL;
     95 	i = atoi(&mp[1]);
     96 	if (i < 1 || i > 19)
     97 		return ILLEGAL;
     98 	return PT(lton((unsigned char)mp[0]), i);
     99 }
    100 
    101 /*
    102  * Turn a letter into a number.
    103  */
    104 static int
    105 lton(int c)
    106 {
    107 	int i;
    108 
    109 	if (islower(c))
    110 		c = toupper(c);
    111 	for (i = 1; i <= BSZ && letters[i] != c; i++)
    112 		;
    113 	return i;
    114 }
    115