robots/rnd_pos.c

   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
  35 static 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
  47 /*
  48  * rnd_pos:
  49  *      Pick a random, unoccupied position
  50  */
  51 COORD *
  52 rnd_pos(void)
  53 {
  54         static COORD pos;
  55         static int call = 0;
  56
  57         do {
  58                 pos.y = rnd(Y_FIELDSIZE - 1) + 1;
  59                 pos.x = rnd(X_FIELDSIZE - 1) + 1;
  60                 refresh();
  61         } while (Field[pos.y][pos.x] != 0);
  62         call++;
  63         return &pos;
  64 }
  65
  66 int
  67 rnd(int range)
  68 {
  69
  70         return random() % range;
  71 }