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.