21.2.30 stream-external-format [Function]

stream-external-format stream => format

Arguments and Values::

stream—a file stream.

format—an external file format.

Description::

Returns an external file format designator for the stream.

Examples::

      (with-open-file (stream "test" :direction :output)
        (stream-external-format stream))
     =>  :DEFAULT
     OR=> :ISO8859/1-1987
     OR=> (:ASCII :SAIL)
     OR=> ACME::PROPRIETARY-FILE-FORMAT-17
     OR=> #<FILE-FORMAT :ISO646-1983 2343673>

See Also::

the :external-format argument to the function open and the with-open-file macro.

Notes::

The format returned is not necessarily meaningful to other implementations.