home *** CD-ROM | disk | FTP | other *** search
- /*
- GNU GO - the game of Go (Wei-Chi)
- Version 1.1 last revised 3-1-89
- Copyright (C) Free Software Foundation, Inc.
- written by Man L. Li
- modified by Wayne Iba
- documented by Bob Webber
- */
- /*
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation - version 1.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License in file COPYING for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- Please report any bug/fix, modification, suggestion to
-
- mail address: Man L. Li
- Dept. of Computer Science
- University of Houston
- 4800 Calhoun Road
- Houston, TX 77004
-
- e-mail address: manli@cs.uh.edu (Internet)
- coscgbn@uhvax1.bitnet (BITNET)
- 70070,404 (CompuServe)
- */
-
- #include <stdio.h>
-
- #define EMPTY 0
-
- extern unsigned char p[19][19], ml[19][19];
- extern int lib;
-
- count(i, j, color)
- /* count liberty of color piece at i, j */
- int i, j, color;
- {
- /* set current piece as marked */
- ml[i][j] = EMPTY;
-
- /* check North neighbor */
- if (i != EMPTY)
- {
- if ((p[i - 1][j] == EMPTY) && ml[i - 1][j])
- {
- ++lib;
- ml[i - 1][j] = EMPTY;
- }
- else
- if ((p[i - 1][j] == color) && ml[i - 1][j])
- count(i - 1, j, color);
- }
- /* check South neighbor */
- if (i != 18)
- {
- if ((p[i + 1][j] == EMPTY) && ml[i + 1][j])
- {
- ++lib;
- ml[i + 1][j] = EMPTY;
- }
- else
- if ((p[i + 1][j] == color) && ml[i + 1][j])
- count(i + 1, j, color);
- }
- /* check West neighbor */
- if (j != EMPTY)
- {
- if ((p[i][j - 1] == EMPTY) && ml[i][j - 1])
- {
- ++lib;
- ml[i][j - 1] = EMPTY;
- }
- else
- if ((p[i][j - 1] == color) && ml[i][j - 1])
- count(i, j - 1, color);
- }
- /* check East neighbor */
- if (j != 18)
- {
- if ((p[i][j + 1] == EMPTY) && ml[i][j + 1])
- {
- ++lib;
- ml[i][j + 1] = EMPTY;
- }
- else
- if ((p[i][j + 1] == color) && ml[i][j + 1])
- count(i, j + 1, color);
- }
- } /* end count */
-