int kvsprintf(const char *format, void *arg, int radix, va_list ap) __attribute__ ((format (printf, 1, 0)));
int vsprintf(char *str, const char *format, va_list ap) __attribute__ ((format (printf, 2, 0)));
int sprintf(char *str, const char *format, ...) __attribute__ ((format (printf, 2, 3)));
int kvsprintf(const char *format, void *arg, int radix, va_list ap) __attribute__ ((format (printf, 1, 0)));
int vsprintf(char *str, const char *format, va_list ap) __attribute__ ((format (printf, 2, 0)));
int sprintf(char *str, const char *format, ...) __attribute__ ((format (printf, 2, 3)));