Function xmlTextReaderConstString 

#[unsafe(no_mangle)]
pub const unsafe extern "C" fn xmlTextReaderConstString(
    _reader: *mut XmlTextReader,
    str: *const xmlChar,
) -> *const xmlChar

const xmlChar *xmlTextReaderConstString(xmlTextReaderPtr reader, const xmlChar *str) — the reader’s dictionary-internalized copy of str; the candidate returns str unchanged (dictionary interning is an internal detail).

SAFETY

• _reader must be valid pointers (or NULL where the upstream C contract allows), obtained from the matching constructor/owner and not yet freed; the callee may take or keep ownership exactly as the C API specifies.

• str must point to valid NUL-terminated strings (or NULL where the C contract allows) for the lifetime of the call.

The caller must not race this call with concurrent mutation of the same objects from other threads (per-object state is not internally synchronized). Violating any of the above is undefined behavior.

Exercised by the C-API differential courts (courts/suites/data-abi/*-family-probe.c) and the CLI differential courts; those pass byte-for-byte against the upstream oracle.