telnet login no response

[yufengjinsong]

	out := bytes.NewBuffer(nil)
	var buffer bytes.Buffer
	var p []byte
	var crlfBuffer [2]byte = [2]byte{'\r','\n'}
	crlf := crlfBuffer[:]
	time.Sleep(1 * time.Second)
	var readBuffer [2]byte
	readP := readBuffer[1:]
	for {
		fmt.Println("telnet_cmd.go 111111111111")
		n, err := c.dataReader.Read(readP)
		fmt.Println("telnet_cmd.go  22222222222222")
		if n <= 0 && nil == err {
			continue
		} else if n <= 0 && nil != err {
			break
		}
		LongWrite(out, readP)
		if (readBuffer[0] == '#' || readBuffer[0] == ':') && readBuffer[1] == ' ' {
			break
		}
		readBuffer[0] = readBuffer[1]
	}

	for _, cmd := range []string{user, pwd} {
		buffer.Write([]byte(cmd))
		buffer.Write(crlf)

		p = buffer.Bytes()

		n, err := LongWrite(c.dataWriter, p)
		if nil != err {
			break
		}
		if expected, actual := int64(len(p)), n; expected != actual {
			fmt.Printf("Transmission problem: tried sending %d bytes, but actually only sent %d bytes. \n ", expected, actual)
			return fmt.Errorf("Transmission problem: tried sending %d bytes, but actually only sent %d bytes. \n ", expected, actual)
		}

		buffer.Reset()

		for {
			n, err := c.dataReader.Read(readP)
			if n <= 0 && nil == err {
				continue
			} else if n <= 0 && nil != err {
				break
			}
			LongWrite(out, readP)
			if (readBuffer[0] == '#' || readBuffer[0] == ':') && readBuffer[1] == ' ' {
				break
			}
			readBuffer[0] = readBuffer[1]
		}

	}

	time.Sleep(3 * time.Millisecond)
	return nil
}```
when i login  it will block in
`
fmt.Println("telnet_cmd.go 111111111111")
n, err := c.dataReader.Read(readP)
fmt.Println("telnet_cmd.go  22222222222222")
`
my develop environment is  win10  
Anyone konw why?
thanks