extern int vsnprintfz(char *dst, size_t n, const char *fmt, va_list args);
extern int snprintfz(char *dst, size_t n, const char *fmt, ...) PRINTFLIKE(3, 4);
extern int vsnprintfz(char *dst, size_t n, const char *fmt, va_list args);
extern int snprintfz(char *dst, size_t n, const char *fmt, ...) PRINTFLIKE(3, 4);