Function xmlFileRead 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlFileRead(
    context: *mut c_void,
    buffer: *mut c_char,
    len: c_int,
) -> c_int

Read up to len bytes from a FILE * I/O context.

UPSTREAM-PARITY

int xmlFileRead(void *context, char *buffer, int len);

SAFETY

• context, buffer 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.

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.