Function xmlSaveFileTo 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlSaveFileTo(
    buf: *mut _xmlOutputBuffer,
    cur: *mut _xmlDoc,
    encoding: *const c_char,
) -> c_int

int xmlSaveFileTo(xmlOutputBufferPtr buf, xmlDocPtr cur, const char *encoding) — upstream xmlsave.c delegates to xmlSaveFormatFileTo(buf, cur, encoding, 0).

SAFETY

• buf must be a valid output buffer (closed by this call).
• cur must be a valid document.