Function htmlGetMetaEncoding 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn htmlGetMetaEncoding(
    doc: *mut _xmlDoc,
) -> *const xmlChar

Look up an encoding declaration in the meta tags of the document.

The returned string points into attribute content (may contain trailing garbage); it should be copied before modifying or freeing nodes — upstream contract.

UPSTREAM-PARITY

const xmlChar *htmlGetMetaEncoding(xmlDoc *doc);