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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
- 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];
-
- openregion(i1, j1, i2, j2)
- /* check if region from i1, j1 to i2, j2 is open */
- int i1, j1, i2, j2;
-
- {
- 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 */
-
-