On Monday, December 16, 2002, at 06:41 PM, Beman Dawes wrote:
At 12:12 PM 12/16/2002, Glen Knowles wrote:Thanks Beman. I understand your reluctance to add this to the library and will implement it as a "library user convenience function" if I need it.
>I think what he might be asking for is something like:
>
>make /my/full/path relative to /my/base/dir produces ../../full/path
Ah... Thanks...
The practical problem is determining if two paths are the same. What if the example was rewritten:
make /My/full/path relative to /my/base/dir
or
make /foo/full/path relative to /my/base/dir
Note that on some operating systems, "/foo" may be the same directory as "My".
Is there a reliable way on all operating systems to tell if two textually different paths represent the same underlying directory or file?
It would be easy for a Filesystem Library user to write a convenience function subject to the limitation it only considers lexically identity. I've always felt that is misleading and error prone. For safety, you really would have to have an operating system function that answers the question "do these two paths represent the same entity?"
Best regards,
Matthias
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