Function xmlSaveToFilename 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlSaveToFilename(
    filename: *const c_char,
    encoding: *const c_char,
    options: c_int,
) -> *mut _xmlSaveCtxt

xmlSaveCtxt *xmlSaveToFilename(const char *filename, const char *encoding, int options).

SAFETY

• filename must be a valid NUL-terminated path.