Arguments: character-input-stream
This is used to implement read-char-no-hang. It returns either a
character, or nil if no input is currently
available, or :eof if end-of-file is reached. The default
method provided by fundamental-character-input-stream
simply calls stream-read-char; this is sufficient for file
streams, but interactive streams should define their own method.
See also streams.htm for general information on streams in Allegro CL.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.