extern int func1 (char *, size_t, const char *, ...)
__attribute__ ((__format__ (__printf__, 3, 4)));
extern int func2 (char *, size_t, const char *, ...)
extern int func1 (char *, size_t, const char *, ...)
__attribute__ ((__format__ (__printf__, 3, 4)));
extern int func2 (char *, size_t, const char *, ...)