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rnd_pos.c revision 1.3 
      1 /*	$NetBSD: rnd_pos.c,v 1.3 1995/04/22 10:09:07 cgd 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)rnd_pos.c	8.1 (Berkeley) 5/31/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: rnd_pos.c,v 1.3 1995/04/22 10:09:07 cgd Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 # include	"robots.h"
     45 
     46 # define	IS_SAME(p,y,x)	((p).y != -1 && (p).y == y && (p).x == x)
     47 
     48 /*
     49  * rnd_pos:
     50  *	Pick a random, unoccupied position
     51  */
     52 COORD *
     53 rnd_pos()
     54 {
     55 	static COORD	pos;
     56 	static int	call = 0;
     57 	register int	i = 0;
     58 
     59 	do {
     60 		pos.y = rnd(Y_FIELDSIZE - 1) + 1;
     61 		pos.x = rnd(X_FIELDSIZE - 1) + 1;
     62 		refresh();
     63 	} while (Field[pos.y][pos.x] != 0);
     64 	call++;
     65 	return &pos;
     66 }
     67 
     68 rnd(range)
     69 int	range;
     70 {
     71 	unsigned int	rand();
     72 
     73 	return rand() % range;
     74 }
     75