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rnd_pos.c revision 1.5 
      1 /*	$NetBSD: rnd_pos.c,v 1.5 2003/08/07 09:37:37 agc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1980, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)rnd_pos.c	8.1 (Berkeley) 5/31/93";
     36 #else
     37 __RCSID("$NetBSD: rnd_pos.c,v 1.5 2003/08/07 09:37:37 agc Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 # include	"robots.h"
     42 
     43 # define	IS_SAME(p,y,x)	((p).y != -1 && (p).y == y && (p).x == x)
     44 
     45 /*
     46  * rnd_pos:
     47  *	Pick a random, unoccupied position
     48  */
     49 COORD *
     50 rnd_pos()
     51 {
     52 	static COORD	pos;
     53 	static int	call = 0;
     54 
     55 	do {
     56 		pos.y = rnd(Y_FIELDSIZE - 1) + 1;
     57 		pos.x = rnd(X_FIELDSIZE - 1) + 1;
     58 		refresh();
     59 	} while (Field[pos.y][pos.x] != 0);
     60 	call++;
     61 	return &pos;
     62 }
     63 
     64 int
     65 rnd(range)
     66 	int	range;
     67 {
     68 
     69 	return rand() % range;
     70 }
     71