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ANSI Common Lisp  21 Streams 21.2 Dictionary of Streams
| 21.2.26 file-length |
Function |
- Syntax:
-
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
- Allegro CL Implementation Details:
-
See cl:file-length implementation
in implementation.html
for information on the implementation of file-length.
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