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21.2.26 file-length [Function]

file-length stream => length

Arguments and Values::

stream—a stream associated with a file.

length—a non-negative integer or nil.

Description::

file-length returns the length of stream, or nil if the length cannot be determined.

For a binary file, the length is measured in units of the element type of the stream.

Examples::
      (with-open-file (s "decimal-digits.text"
                         :direction :output :if-exists :error)
        (princ "0123456789" s)
        (truename s))
     =>  #P"A:>Joe>decimal-digits.text.1"
      (with-open-file (s "decimal-digits.text")
        (file-length s))
     =>  10
Exceptional Situations::

Should signal an error of type type-error if stream is not a stream associated with a file.

See Also::

open