1*86d7f5d3SJohn Marino /*-
2*86d7f5d3SJohn Marino * Copyright (c) 1980, 1993
3*86d7f5d3SJohn Marino * The Regents of the University of California. All rights reserved.
4*86d7f5d3SJohn Marino *
5*86d7f5d3SJohn Marino * Redistribution and use in source and binary forms, with or without
6*86d7f5d3SJohn Marino * modification, are permitted provided that the following conditions
7*86d7f5d3SJohn Marino * are met:
8*86d7f5d3SJohn Marino * 1. Redistributions of source code must retain the above copyright
9*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer.
10*86d7f5d3SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
11*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer in the
12*86d7f5d3SJohn Marino * documentation and/or other materials provided with the distribution.
13*86d7f5d3SJohn Marino * 3. Neither the name of the University nor the names of its contributors
14*86d7f5d3SJohn Marino * may be used to endorse or promote products derived from this software
15*86d7f5d3SJohn Marino * without specific prior written permission.
16*86d7f5d3SJohn Marino *
17*86d7f5d3SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18*86d7f5d3SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*86d7f5d3SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*86d7f5d3SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21*86d7f5d3SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*86d7f5d3SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*86d7f5d3SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*86d7f5d3SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*86d7f5d3SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*86d7f5d3SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*86d7f5d3SJohn Marino * SUCH DAMAGE.
28*86d7f5d3SJohn Marino *
29*86d7f5d3SJohn Marino * @(#)rnd_pos.c 8.1 (Berkeley) 5/31/93
30*86d7f5d3SJohn Marino * $FreeBSD: src/games/robots/rnd_pos.c,v 1.5 1999/11/30 03:49:20 billf Exp $
31*86d7f5d3SJohn Marino * $DragonFly: src/games/robots/rnd_pos.c,v 1.3 2006/08/27 21:45:07 pavalos Exp $
32*86d7f5d3SJohn Marino */
33*86d7f5d3SJohn Marino
34*86d7f5d3SJohn Marino #include "robots.h"
35*86d7f5d3SJohn Marino
36*86d7f5d3SJohn Marino #define IS_SAME(p,y,x) ((p).y != -1 && (p).y == y && (p).x == x)
37*86d7f5d3SJohn Marino
38*86d7f5d3SJohn Marino static int rnd(int);
39*86d7f5d3SJohn Marino
40*86d7f5d3SJohn Marino /*
41*86d7f5d3SJohn Marino * rnd_pos:
42*86d7f5d3SJohn Marino * Pick a random, unoccupied position
43*86d7f5d3SJohn Marino */
44*86d7f5d3SJohn Marino COORD *
rnd_pos(void)45*86d7f5d3SJohn Marino rnd_pos(void)
46*86d7f5d3SJohn Marino {
47*86d7f5d3SJohn Marino static COORD pos;
48*86d7f5d3SJohn Marino static int call = 0;
49*86d7f5d3SJohn Marino
50*86d7f5d3SJohn Marino do {
51*86d7f5d3SJohn Marino pos.y = rnd(Y_FIELDSIZE - 1) + 1;
52*86d7f5d3SJohn Marino pos.x = rnd(X_FIELDSIZE - 1) + 1;
53*86d7f5d3SJohn Marino refresh();
54*86d7f5d3SJohn Marino } while (Field[pos.y][pos.x] != 0);
55*86d7f5d3SJohn Marino call++;
56*86d7f5d3SJohn Marino return &pos;
57*86d7f5d3SJohn Marino }
58*86d7f5d3SJohn Marino
59*86d7f5d3SJohn Marino static int
rnd(int range)60*86d7f5d3SJohn Marino rnd(int range)
61*86d7f5d3SJohn Marino {
62*86d7f5d3SJohn Marino
63*86d7f5d3SJohn Marino return random() % range;
64*86d7f5d3SJohn Marino }
65