Function xmlTextWriterSetQuoteChar 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlTextWriterSetQuoteChar(
    writer: *mut XmlTextWriter,
    quotechar: xmlChar,
) -> c_int

Set the quote character used for attribute and entity values.

UPSTREAM-PARITY

int xmlTextWriterSetQuoteChar(xmlTextWriterPtr writer, xmlChar quotechar);

Only ' and '\"' are accepted; anything else returns -1.