+void warn_elem(struct uci_element *e, const char *format, ...)
+ __attribute__ ((format (printf, 2, 3)));
+void warn(const char *format, ...)
+ __attribute__ ((format (printf, 1, 2)));
+void error(const char *format, ...)
+ __attribute__ ((format (printf, 1, 2)));
+void info(const char *format, ...)
+ __attribute__ ((format (printf, 1, 2)));