Function maybe_reset_pick

src/lock.c:268–285

level change or object deletion; context may no longer be valid */

/* level change or object deletion; context may no longer be valid */
void
maybe_reset_pick(struct obj *container) /* passed from obfree() */
{
    /*
     * If a specific container, only clear context if it is for that
     * particular container (which is being deleted).  Other stuff on
     * the current dungeon level remains valid.
     * However if 'container' is Null, clear context if not carrying
     * gx.xlock.box (which might be Null if context is for a door).
     * Used for changing levels, where a floor container or a door is
     * being left behind and won't be valid on the new level but a
     * carried container will still be.  There might not be any context,
     * in which case redundantly clearing it is harmless.
     */
    if (container ? (container == gx.xlock.box)
                  : (!gx.xlock.box || !carried(gx.xlock.box)))
        reset_pick();
}

/* pick a tool for autounlock */
struct obj *