-void svprintf(char *keyname, size_t keylen, int keytype, const char *format,...);
-void SVPRINTF(char *keyname, int keytype, const char *format,...);
+void svprintf(char *keyname, size_t keylen, int keytype, const char *format,...) __attribute__((__format__(__printf__,4,5)));
+void SVPRINTF(char *keyname, int keytype, const char *format,...) __attribute__((__format__(__printf__,3,4)));