stream-read-char-no-hang

stream-read-char-no-hang Generic Function

Summary

Returns either a character from the stream, :eof if the end-of-file is reached, or nil if no input is currently available.

Package

stream

Signature

stream-read-char-no-hang stream => result

Arguments

stream⇩

An input stream.

Values

result

Either a character, :eof or nil.

Description

The generic function stream-read-char-no-hang implements read-char-no-hang. It returns either a character read from the stream, or:eof if end-of-file is reached, or nil if no input is available. The default method specializes stream on fundamental-character-input-stream and simply calls stream-read-char which is sufficient for file streams, but interactive streams should define their own method.