AC_XFER_OUT
ac->ac_flags |= (tflag & (AC_XFER_OUT | AC_XFER_IN));
if (tflag & AC_XFER_OUT)
if (ac->ac_flags & AC_XFER_OUT)
AC_XFER_IN | AC_XFER_OUT);
(dowrite ? AC_XFER_OUT : AC_XFER_IN));