games/gomoku/stoc.c

   1 /*      $NetBSD: stoc.c,v 1.11 2009/06/04 05:51:12 dholland 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 1.11 2009/06/04 05:51:12 dholland 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", letters[s % BSZ1], s / BSZ1);
  78         return(buf);
  79 }
  80
  81 /*
  82  * Turn the character form of a move into the spot number form.
  83  */
  84 int
  85 ctos(const char *mp)
  86 {
  87         int i;
  88
  89         for (i = 0; mv[i].m_code >= 0; i++)
  90                 if (strcmp(mp, mv[i].m_text) == 0)
  91                         return(mv[i].m_code);
  92         if (!isalpha((unsigned char)mp[0]))
  93                 return(ILLEGAL);
  94         i = atoi(&mp[1]);
  95         if (i < 1 || i > 19)
  96                 return(ILLEGAL);
  97         return(PT(lton((unsigned char)mp[0]), i));
  98 }
  99
 100 /*
 101  * Turn a letter into a number.
 102  */
 103 static int
 104 lton(int c)
 105 {
 106         int i;
 107
 108         if (islower(c))
 109                 c = toupper(c);
 110         for (i = 1; i <= BSZ && letters[i] != c; i++)
 111                 ;
 112         return(i);
 113 }