Function xmlCharEncNewCustomHandler 

pub unsafe extern "C" fn xmlCharEncNewCustomHandler(
    name: *const c_char,
    input: xmlCharEncConvFunc,
    output: xmlCharEncConvFunc,
    ctxtDtor: xmlCharEncConvCtxtDtor,
    inputCtxt: *mut c_void,
    outputCtxt: *mut c_void,
    out: *mut *mut xmlCharEncodingHandler,
) -> xmlParserErrors