Function xmlReaderNewFile 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlReaderNewFile(
    reader: *mut XmlTextReader,
    filename: *const c_char,
    encoding: *const c_char,
    options: c_int,
) -> c_int

int xmlReaderNewFile(xmlTextReaderPtr reader, const char *filename, const char *encoding, int options).