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stoc.c revision 1.18 
      1 /*	$NetBSD: stoc.c,v 1.18 2022/05/19 22:19:18 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 1.18 2022/05/19 22:19:18 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 struct mvstr {
     47 	int	m_code;
     48 	const char	*m_text;
     49 };
     50 static	const struct	mvstr	mv[] = {
     51 	{ RESIGN,	"resign" },
     52 	{ RESIGN,	"quit" },
     53 	{ SAVE,		"save" },
     54 	{ -1,		0 }
     55 };
     56 
     57 static int lton(int);
     58 
     59 
     60 /*
     61  * Turn the spot number form of a move into the character form.
     62  */
     63 const char *
     64 stoc(int s)
     65 {
     66 	static char buf[32];
     67 
     68 	for (int i = 0; mv[i].m_code >= 0; i++)
     69 		if (s == mv[i].m_code)
     70 			return mv[i].m_text;
     71 	snprintf(buf, sizeof(buf), "%c%d",
     72 	    letters[s % (BSZ + 1)], s / (BSZ + 1));
     73 	return buf;
     74 }
     75 
     76 /*
     77  * Turn the character form of a move into the spot number form.
     78  */
     79 int
     80 ctos(const char *mp)
     81 {
     82 
     83 	for (int i = 0; mv[i].m_code >= 0; i++)
     84 		if (strcmp(mp, mv[i].m_text) == 0)
     85 			return mv[i].m_code;
     86 	if (!isalpha((unsigned char)mp[0]))
     87 		return ILLEGAL;
     88 	int i = atoi(&mp[1]);
     89 	if (i < 1 || i > 19)
     90 		return ILLEGAL;
     91 	return PT(lton((unsigned char)mp[0]), i);
     92 }
     93 
     94 /*
     95  * Turn a letter into a number.
     96  */
     97 static int
     98 lton(int c)
     99 {
    100 	int i;
    101 
    102 	if (islower(c))
    103 		c = toupper(c);
    104 	for (i = 1; i <= BSZ && letters[i] != c; i++)
    105 		;
    106 	return i;
    107 }
    108