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/*
GNUGO - the game of Go (Wei-Chi)
Version 1.2 last revised 10-31-95
Copyright (C) Free Software Foundation, Inc.
written by Man L. Li
modified by Wayne Iba
modified by Frank Pursel <fpp%minor.UUCP@dragon.com>
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 2.
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
manli@cs.uh.edu
*/
/*--------------------------------------------------
openregn.c -- Check if rectangular region is open
---------------------------------------------------*/
#include "gnugo.h"
extern unsigned char p[19][19]; /* go board */
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 */
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