Bound to a function taking a pathname as an argument and returning
a new pathname. Normally the new pathname will differ only in the
filename and type slots, with both being some reasonable modification
of the original filename and type. This function is run when the value
of the if-exists keyword argument to
open is :rename or
:rename-and-delete (and the
direction argument is
:io or :output, so the
if-exists argument is not
ignored).
The function that is the initial value of this variable prepends
the value of
*open-rename-prefix* to the
file name and appends the value of
*open-rename-suffix* as the
new file type (the old type, if present, becomes part of the file
name). Thus, using the initial values for the three variables, a file
named foo.bar will be renamed foo.bar.bak: the file name
is foo.bar and the type is bak. A file named
foo will be renamed foo.bak.
Note this behavior is changed from Allegro CL 4.3 on Unix platforms. In the older versions, -old was appended to the type. The change allows better integration with Windows.
See Extensions to cl:make-package, cl:disassemble, cl:openimplementation.htm for information on the implementation of open.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.