Function xmlShellSave 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlShellSave(
    ctxt: *mut _xmlShellCtxt,
    filename: *mut c_char,
    _node: *mut _xmlNode,
    _node2: *mut _xmlNode,
) -> c_int

int xmlShellSave(xmlShellCtxtPtr ctxt, char *filename, xmlNodePtr node, xmlNodePtr node2) — the shell “save” command: write the current document to filename, or to its original name when no filename is given.