Function ffexts 

pub unsafe extern "C" fn ffexts(
    extspec: *mut c_char,
    extnum: *mut c_int,
    extname: *mut c_char,
    extvers: *mut c_int,
    hdutype: *mut c_int,
    colname: *mut c_char,
    rowexpress: *mut c_char,
    status: *mut c_int,
) -> c_int