make-echo-stream [Function]

make-echo-stream input-stream output-stream => echo-stream

Arguments and Values::

input-stream---an input stream.

output-stream---an output stream.

echo-stream---an echo stream.

Description::

Creates and returns an echo stream that takes input from input-stream and sends output to output-stream.

Examples::

 (let ((out (make-string-output-stream)))
    (with-open-stream 
        (s (make-echo-stream
            (make-string-input-stream "this-is-read-and-echoed")
            out))
      (read s)
      (format s " * this-is-direct-output")
      (get-output-stream-string out)))
=>  "this-is-read-and-echoed * this-is-direct-output"

See Also::

@xref{echo-stream-input-stream; echo-stream-output-stream} , echo-stream-output-stream, section make-two-way-stream [Function]

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