Function xmlSetupParserForBuffer 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlSetupParserForBuffer(
    ctxt: *mut _xmlParserCtxt,
    buffer: *const xmlChar,
    filename: *const c_char,
)

Setup the parser context to parse a new buffer (legacy API).

UPSTREAM-PARITY

void xmlSetupParserForBuffer(xmlParserCtxtPtr ctxt, const xmlChar* buffer,
                             const char *filename);

SAFETY

• ctxt 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.

• buffer, filename 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.