1 /* $OpenBSD: rnd_pos.c,v 1.4 2004/11/29 08:52:29 jsg 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 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)rnd_pos.c 8.1 (Berkeley) 5/31/93"; 35 #else 36 static char rcsid[] = "$OpenBSD: rnd_pos.c,v 1.4 2004/11/29 08:52:29 jsg Exp $"; 37 #endif 38 #endif /* not lint */ 39 40 #include "robots.h" 41 42 #define IS_SAME(p,y,x) ((p).y != -1 && (p).y == y && (p).x == x) 43 44 /* 45 * rnd_pos: 46 * Pick a random, unoccupied position 47 */ 48 COORD * 49 rnd_pos(void) 50 { 51 static COORD pos; 52 static int call = 0; 53 54 do { 55 pos.y = rnd(Y_FIELDSIZE - 1) + 1; 56 pos.x = rnd(X_FIELDSIZE - 1) + 1; 57 refresh(); 58 } while (Field[pos.y][pos.x] != 0); 59 call++; 60 return &pos; 61 } 62 63 int 64 rnd(int range) 65 { 66 return (int)random() % range; 67 } 68