Who says it must be platform independent? Not every script ever written needs to be portable. What is reasonable depends on the application, so I don't think it's something you can put on File::Spec.

For example, if you are writing a CGI that is supposed to serve a file to the user, you can probably have all such files confined to a specific directory, and allow only relative filenames that don't contain double dots. To be on the safe side, I would constrain the filename to the smallest possible set of characters, such as /^\w+$/. But again, it depends on the application.

In reply to Re^4: Bad code from the trenches by itub
in thread Bad code from the trenches by Whitehawke

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