make-string-input-stream

(make-string-input-stream string &optional start end)

Returns a character input stream that reads from string, so read-char, read-line, peek-char and read consume it like any other input stream. It is the explicit form of the stream with-input-from-string binds, and is what you need when the stream has to outlive one expression -- when it is stored, or handed to a function that takes a stream. start and end bound the portion read, in characters.