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POSIX and HFS paths

 
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Not really a Java question, but a Mac one. In fact, I will be implementing in C/C++ (ugh!).

Anyone know of a way to tell reliably whether a given path (as a string) is POSIX or HFS?

There are various "obvious" things to do, such as looking for colons and/or slashes. But those sorts of heuristics often have pitfalls. I am hoping there might be a properly thought-out approach.

I have looked in CFURL package of Mac frameworks, which has stuff for converting between POSIX and HFS, but not for determining which one you've got.

The higher-level requirement is that I want to take a file path that I have been given through an interface that doesn't say what type it is. It could be POSIX or HFS. I want to end up with a path that is definitely HFS.
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