| /* |
| 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]; |
| |
| int openregion(int i1, int j1, int i2, int j2) |
| /* check if region from i1, j1 to i2, j2 is open */ |
| { |
| int minx, maxx, miny, maxy, x, y; |
| |
| /* exchange upper and lower limits */ |
| |
| if (i1 < i2) |
| { |
| miny = i1; |
| maxy = i2; |
| } |
| else |
| { |
| miny = i2; |
| maxy = i1; |
| } |
| |
| if (j1 < j2) |
| { |
| minx = j1; |
| maxx = j2; |
| } |
| else |
| { |
| minx = j2; |
| maxx = j1; |
| } |
| |
| /* check for empty region */ |
| for (y = miny; y <= maxy; y++) |
| for (x = minx; x <= maxx; x++) |
| if (p[y][x] != EMPTY) return 0; |
| return 1; |
| } /* end openregion */ |
| |
