let {{ rs_name }} = if {{ name }}.is_null() {
        None
    } else {
        // SAFETY: null check above guarantees {{ name }} is a valid pointer; string is valid UTF-8 from caller.
        match unsafe { CStr::from_ptr({{ name }}) }.to_str() {
            Ok(s) => Some(s.to_string()),
            Err(_) => {
                set_last_error(1, "Invalid UTF-8 in parameter '{{ name }}'");
                {{ fail_ret }}
            }
        }
    };
