pub unsafe extern "C" fn s7_open_input_function(
sc: *mut s7_scheme,
function: Option<unsafe extern "C" fn(sc: *mut s7_scheme, read_choice: s7_read_t, port: s7_pointer) -> s7_pointer>,
) -> s7_pointerpub unsafe extern "C" fn s7_open_input_function(
sc: *mut s7_scheme,
function: Option<unsafe extern "C" fn(sc: *mut s7_scheme, read_choice: s7_read_t, port: s7_pointer) -> s7_pointer>,
) -> s7_pointer