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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
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: (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;
miny = i2;
maxy = i1;
if (j1 < j2)
minx = j1;
maxx = j2;
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 */