memcpy (rightkey, ptr, ptr->len + 1);
set->page->garbage += ptr->len + val->len + 2;
memset (slotptr(set->page, set->page->cnt--), 0, sizeof(BtSlot));
ptr = keyptr(set->page, set->page->cnt);
memcpy (leftkey, ptr, ptr->len + 1);
memcpy (rightkey, ptr, ptr->len + 1);
set->page->garbage += ptr->len + val->len + 2;
memset (slotptr(set->page, set->page->cnt--), 0, sizeof(BtSlot));
ptr = keyptr(set->page, set->page->cnt);
memcpy (leftkey, ptr, ptr->len + 1);