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rnd_pos.c revision 1.1 
      1 /*
      2  * Copyright (c) 1980 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)rnd_pos.c	5.4 (Berkeley) 6/1/90";
     36 #endif /* not lint */
     37 
     38 # include	"robots.h"
     39 
     40 # define	IS_SAME(p,y,x)	((p).y != -1 && (p).y == y && (p).x == x)
     41 
     42 /*
     43  * rnd_pos:
     44  *	Pick a random, unoccupied position
     45  */
     46 COORD *
     47 rnd_pos()
     48 {
     49 	static COORD	pos;
     50 	static int	call = 0;
     51 	register int	i = 0;
     52 
     53 	do {
     54 		pos.y = rnd(Y_FIELDSIZE - 1) + 1;
     55 		pos.x = rnd(X_FIELDSIZE - 1) + 1;
     56 		refresh();
     57 	} while (Field[pos.y][pos.x] != 0);
     58 	call++;
     59 	return &pos;
     60 }
     61 
     62 rnd(range)
     63 int	range;
     64 {
     65 	unsigned int	rand();
     66 
     67 	return rand() % range;
     68 }
     69