It might be worth taking a look at what Boost.Filesystem does here:
https://www.boost.org/doc/libs/1_68_0/libs/filesystem/doc/reference.html#path-decomposition-table
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This method returns the “head” of a path; that is, the Prefix and RootDir components (if any). This is useful for implementing “adjoinment” logic (if you want to implement your own alternative to
canonicalize()) and could also be useful for Windows programs want to know whether two paths are on the same drive.
In Python's pathlib, this is called .anchor.
There is a suggestion in the API Guidelines to offer unchecked versions of functions that are unsafe. There is some question about invariant-safety vs memory-safety so I've opened rust-lang-nursery/api-guidelines#179
That's not the case: PathBuf is a newtype around OsString, which has different guarantees than String.
Due to the &str (or &OsStr at least) to Path and vice-versa AsRef conversions, it’s impossible to have Path be a NULL-terminated array of OsStr in platforms that use such representation.
This also applies to PathBuf.
AsRef = type-punned.
fs::normalize on Windows needs to be implemented using GetFullPathNameW. Doing anything else is liable to get things wrong in corner cases.
Also just a reminder that people should read https://googleprojectzero.blogspot.com/2016/02/the-definitive-guide-on-win32-to-nt.html
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