func io.copyBuffer

4 uses

	io (current package)
		io.go#L389: 	return copyBuffer(dst, src, nil)
		io.go#L403: 	return copyBuffer(dst, src, buf)
		io.go#L408: func copyBuffer(dst Writer, src Reader, buf []byte) (written int64, err error) {
		multi.go#L54: 			n, err = copyBuffer(w, r, buf)