Function arti_invoke_cost

src/artifact.c:2105–2128

return TRUE if artifact object's invoke cost can be paid (and pay it) */

/* return TRUE if artifact object's invoke cost can be paid (and pay it) */
staticfn boolean
arti_invoke_cost(struct obj *obj)
{
    if (obj->age > svm.moves) {
        int pw_cost = arti_invoke_cost_pw(obj);

        if (pw_cost < 0 || u.uen < pw_cost) {
            /* the artifact is tired :-) */
            You_feel("that %s %s ignoring you.", the(xname(obj)),
                     otense(obj, "are"));
            /* and just got more so; patience is essential... */
            obj->age += (long) d(3, 10);
            return FALSE;
        } else {
            /* you pay invoke cost with your own magic */
            You_feel("drained...");
            u.uen -= pw_cost;
            disp.botl = TRUE;
        }
    } else {
        obj->age = svm.moves + rnz(100);
    }
    return TRUE;
}

staticfn int
arti_invoke(struct obj *obj)