1/*	$NetBSD: rnd_pos.c,v 1.9 2009/07/20 06:43:18 dholland 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
35static char sccsid[] = "@(#)rnd_pos.c	8.1 (Berkeley) 5/31/93";
36#else
37__RCSID("$NetBSD: rnd_pos.c,v 1.9 2009/07/20 06:43:18 dholland Exp $");
38#endif
39#endif /* not lint */
40
41#include <curses.h>
42#include <stdlib.h>
43#include "robots.h"
44
45#define IS_SAME(p,y,x)	((p).y != -1 && (p).y == y && (p).x == x)
46
47static int rnd(int);
48
49/*
50 * rnd_pos:
51 *	Pick a random, unoccupied position
52 */
53COORD *
54rnd_pos(void)
55{
56	static COORD pos;
57	static int call = 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
68static int
69rnd(int range)
70{
71
72	return random() % range;
73}
74