@Override
      public int read(CharBuffer cbuf) throws IOException {
        return reader.read(cbuf);
      }
    };
  }

  private static Reader getChunkedReader(String input, final int chunk) {
    return new FilterReader(new StringReader(input)) {
      @Override
      public int read(char[] cbuf, int off, int len) throws IOException {
        return super.read(cbuf, off, Math.min(chunk, len));
      }
    };

    }

    @Override
    public int read(char[] cbuf, int off, int len) throws IOException {
        for (int i = 0; i < len; i++) {
            final int c = read();
            if (c == -1) {
                if (i == 0) {
                    return -1;
                } else {
                    return i;
                }
            }
            cbuf[off + i] = (char) c;
        }
        return len;

  public void write(int c) throws IOException {
    super.write(c);
    flush(); // flush write to TestOutputStream to get its behavior
  }

  @Override
  public void write(char[] cbuf, int off, int len) throws IOException {
    super.write(cbuf, off, len);
    flush();
  }

  @Override
  public void write(String str, int off, int len) throws IOException {
    super.write(str, off, len);
    flush();
  }

	if err != nil {
		t.Fatal(err)
	}
	// Use a very small prime sized buffer.
	cbuf := make([]byte, 787)
	_, err = io.CopyBuffer(w, struct{ io.Reader }{br}, cbuf)
	if err != nil {
		t.Fatal(err)
	}
	w.Close()

	// We choose a different buffer size,
	// bigger than a maximum block, and also a prime.
	var b2 bytes.Buffer
	cbuf = make([]byte, 81761)
	br2 := bytes.NewBuffer(t1)
	w2, err := NewWriter(&b2, i)

  @Override
  public synchronized int read(char[] cbuf, int off, int len) throws IOException {
    checkPositionIndexes(off, off + len, cbuf.length);
    checkOpen();
    requireNonNull(seq); // safe because of checkOpen
    if (!hasRemaining()) {
      return -1;
    }
    int charsToRead = Math.min(len, remaining());
    for (int i = 0; i < charsToRead; i++) {
      cbuf[off + i] = seq.charAt(pos++);
    }

  @Override
  public synchronized int read(char[] cbuf, int off, int len) throws IOException {
    checkPositionIndexes(off, off + len, cbuf.length);
    checkOpen();
    requireNonNull(seq); // safe because of checkOpen
    if (!hasRemaining()) {
      return -1;
    }
    int charsToRead = Math.min(len, remaining());
    for (int i = 0; i < charsToRead; i++) {
      cbuf[off + i] = seq.charAt(pos++);
    }

    @Override
    public void write(int c) {}

    @Override
    public void write(char[] cbuf) {
      checkNotNull(cbuf);
    }

    @Override
    public void write(char[] cbuf, int off, int len) {
      checkPositionIndexes(off, off + len, cbuf.length);
    }

    @Override
    public void write(String str) {
      checkNotNull(str);
    }

    @Override

            def stdout = new java.io.Writer() {
                def buffer = new StringBuilder()
                def written = false

                void write(char[] cbuf, int off, int len) {
                    buffer.append(cbuf, off, len)
                    if (!written && buffer.toString().contains('$PROMPT')) {
                        written = true

    @Override
    public void write(int c) {}

    @Override
    public void write(char[] cbuf) {
      checkNotNull(cbuf);
    }

    @Override
    public void write(char[] cbuf, int off, int len) {
      checkPositionIndexes(off, off + len, cbuf.length);
    }

    @Override
    public void write(String str) {
      checkNotNull(str);
    }

    @Override

	freeBuf *stackWorkBuf // keep around one free buffer for allocation hysteresis

	// cbuf contains conservative pointers to stack objects. If
	// all pointers to a stack object are obtained via
	// conservative scanning, then the stack object may be dead
	// and may contain dead pointers, so it must be scanned
	// defensively.
	cbuf *stackWorkBuf

	// list of stack objects
	// Objects are in increasing address order.