/*      $OpenBSD: stoc.c,v 1.11 2016/01/08 21:38:33 mestre 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 <ctype.h>
#include <stdlib.h>
#include <string.h>

#include "gomoku.h"

char    *letters        = "<ABCDEFGHJKLMNOPQRST>";

struct mvstr {
        int     m_code;
        char    *m_text;
};
static  struct  mvstr   mv[] = {
        {RESIGN,        "resign" },
        {RESIGN,        "quit" },
        {SAVE,          "save" },
        {-1,            0}
};

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

        for (i = 0; mv[i].m_code >= 0; i++)
                if (s == mv[i].m_code)
                        return(mv[i].m_text);
        snprintf(buf, sizeof buf, "%c%d", letters[s % BSZ1], s / BSZ1);
        return(buf);
}

/*
 * Turn the character form of a move into the spot number form.
 */
int
ctos(char *mp)
{
        int i;

        for (i = 0; mv[i].m_code >= 0; i++)
                if (strcmp(mp, mv[i].m_text) == 0)
                        return(mv[i].m_code);
        if (!isalpha((unsigned char)mp[0]))
                return(ILLEGAL);
        i = atoi(&mp[1]);
        if (i < 1 || i > 19)
                return(ILLEGAL);
        return(PT(lton(mp[0]), i));
}

/*
 * Turn a letter into a number.
 */
int
lton(int c)
{
        int i;

        if (islower(c))
                c = toupper(c);
        for (i = 1; i <= BSZ && letters[i] != c; i++)
                ;
        return(i);
}