#include "stddef.h"
#include "stdarg.h"

int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
int snprintf(char * buf, size_t size, const char *fmt, ...);
int vsprintf(char *buf, const char *fmt, va_list args);
int sprintf(char * buf, const char *fmt, ...);
int vsscanf(const char * buf, const char * fmt, va_list args);
int sscanf(const char * buf, const char * fmt, ...);