date and time created 88/10/19 15:41:32 by bostic
[unix-history] / usr / src / games / robots / rnd_pos.c
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)rnd_pos.c 5.3 (Berkeley) %G%";
#endif /* not lint */
# include "robots.h"
# define IS_SAME(p,y,x) ((p).y != -1 && (p).y == y && (p).x == x)
/*
* rnd_pos:
* Pick a random, unoccupied position
*/
COORD *
rnd_pos()
{
static COORD pos;
static int call = 0;
register int i = 0;
do {
pos.y = rnd(Y_FIELDSIZE - 1) + 1;
pos.x = rnd(X_FIELDSIZE - 1) + 1;
refresh();
} while (Field[pos.y][pos.x] != 0);
call++;
return &pos;
}
rnd(range)
int range;
{
unsigned int rand();
return rand() % range;
}