Function xmlCharEncFirstLine 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlCharEncFirstLine(
    handler: *mut _xmlCharEncodingHandler,
    out: *mut _xmlBuffer,
    in_: *mut _xmlBuffer,
) -> c_int

Convert the first line of in using the encoding handler, appending the result to out.

UPSTREAM-PARITY

int xmlCharEncFirstLine(xmlCharEncodingHandlerPtr handler,
                        struct _xmlBuffer *out, struct _xmlBuffer *in);