Function xmlSaveFormatFileTo 

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

int xmlSaveFormatFileTo(xmlOutputBufferPtr buf, xmlDocPtr cur, const char *encoding, int format) — serialize cur into an existing output buffer and close it (upstream xmlsave.c).

SAFETY

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