const int ystart = MAX(0,       you.y_pos - range);
    const int yend   = MIN(GYM - 1, you.y_pos + range);
    const int xstart = MAX(0,       you.x_pos - range);
    const int xend   = MIN(GXM - 1, you.x_pos + range);

    // Sweep every square within range.
    radius_iterator ri(you.pos(), range);

    // Monster check.
    for (int y = ystart; y <= yend; ++y)

    for ( ; ri; ++ri )

        for (int x = xstart; x <= xend; ++x)

        const unsigned short targ_monst = env.mgrid(*ri);
        if (targ_monst != NON_MONSTER)

            const unsigned short targ_monst = env.mgrid[x][y];
            if (targ_monst != NON_MONSTER)

            if (see_grid(*ri))

                if (see_grid(x, y))

                monsters *mon = &env.mons[targ_monst];
                if (player_monster_visible(mon)
                    && !mons_is_submerged(mon)
                    && (!mons_is_mimic(mon->type) || mons_is_known_mimic(mon))
                    && (!dangerous_only || !mons_is_safe(mon, want_move)))

                    monsters *mon = &env.mons[targ_monst];
                    if (player_monster_visible(mon)
                        && !mons_is_submerged(mon)
                        && (!mons_is_mimic(mon->type)
                            || mons_is_known_mimic(mon))
                        && (!dangerous_only || !mons_is_safe(mon, want_move)))
                    {
                        mons.push_back(mon);
                        if (just_check)
                        {
                            // One monster found, that's enough.
                            return;
                        }
                    }

                    mons.push_back(mon);
                    if (just_check) // stop once you find one
                        return;

/****************************************************/