file-length stream ⇒ length
| stream | a stream associated with a file. |
| length | a non-negative integer or nil. |
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.
(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
Should signal an error of type type-error if stream is not a stream associated with a file.