__bt_split
if ((status = __bt_split(t, h, key,
int __bt_split __P((BTREE *, PAGE *,
status = __bt_split(t, h, NULL, data, dflags, nbytes, idx);
if ((status = __bt_split(t, h, key,
int __bt_split(BTREE *, PAGE *,
status = __bt_split(t, h, NULL, data, dflags, nbytes, idx);