/*	$NetBSD: stoc.c,v 1.21 2022/05/29 00:12:11 rillig Exp $	*/

/*
 * Copyright (c) 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
/*	@(#)stoc.c	8.1 (Berkeley) 7/24/94	*/
__RCSID("$NetBSD: stoc.c,v 1.21 2022/05/29 00:12:11 rillig Exp $");

#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "gomoku.h"

const char	letters[]	= "<ABCDEFGHJKLMNOPQRST>";


/*
 * Turn the spot number form of a move into the character form.
 */
const char *
stoc(spot_index s)
{
	static char buf[32];

	if (s == RESIGN)
		return "resign";
	if (s == SAVE)
		return "save";
	snprintf(buf, sizeof(buf), "%c%d",
	    letters[s % (BSZ + 1)], s / (BSZ + 1));
	return buf;
}

/*
 * Turn the character form of a move into the spot number form.
 */
spot_index
ctos(const char *mp)
{

	if (strcmp(mp, "resign") == 0 || strcmp(mp, "quit") == 0)
		return RESIGN;
	if (strcmp(mp, "save") == 0)
		return SAVE;

	int letter = toupper((unsigned char)mp[0]);
	int x = 1;
	while (x <= BSZ && letters[x] != letter)
		x++;
	if (x > BSZ)
		return ILLEGAL;

	int y = atoi(&mp[1]);
	if (y < 1 || y > 19)
		return ILLEGAL;

	return PT(x, y);
}