usr/src/games/robots/rnd_pos.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)rnd_pos.c   5.1 (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;
}