Function xmlTextReaderByteConsumed 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlTextReaderByteConsumed(
    reader: *mut XmlTextReader,
) -> c_long

long xmlTextReaderByteConsumed(xmlTextReaderPtr reader).

Returns the total bytes consumed from the input (0 when unavailable — the candidate parses the full input up front; documented divergence).