Function BIO_asn1_set_prefix

pub unsafe extern "C" fn BIO_asn1_set_prefix(
    b: *mut bio_st,
    prefix: Option<unsafe extern "C" fn(*mut bio_st, *mut *mut u8, *mut i32, *mut c_void) -> i32>,
    prefix_free: Option<unsafe extern "C" fn(*mut bio_st, *mut *mut u8, *mut i32, *mut c_void) -> i32>,
) -> i32