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input-stream—an input stream.
output-stream—an output stream.
echo-stream—an echo stream.
Creates and returns an echo stream that takes input from input-stream and sends output to output-stream.
(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"
echo-stream-input-stream, echo-stream-output-stream, make-two-way-stream