#define va_arg __builtin_va_arg
#define va_end __builtin_va_end
int kvsprintf(char const *fmt, void *arg, int radix, va_list ap);
#define va_arg __builtin_va_arg
#define va_end __builtin_va_end
int kvsprintf(char const *fmt, void *arg, int radix, va_list ap);