extern def printf(fmt: const str, *args) -> int
extern def fprintf(stream: bytes, fmt: const str, *args) -> int
extern def sprintf(buf: bytes, fmt: const str, *args) -> int
extern def snprintf(buf: bytes, size: sizet, fmt: const str, *args) -> int
extern def puts(s: const str) -> int
extern def fputs(s: const str, stream: bytes) -> int
extern def fgets(buf: bytes, size: int, stream: bytes) -> bytes
extern def fflush(stream: bytes) -> int