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Read-file-into-character-list

Read a file into a character-list.

;; Returns a character list, or nil if the file does not exist.
;; May be faster than read-file-characters from std/io.
;; Note that this does not return state (see :doc read-file-into-string
;; for an explanation).
(defund read-file-into-character-list (filename state)
  (declare (xargs :guard (stringp filename)
                  :stobjs state))
  (let ((string (read-file-into-string filename)))
    (if (not string)
        nil
      (coerce string 'list))))