This allows using longer paths for filesystem operations without the user needing to `canonicalize` or manually prefix paths.
If the path is already verbatim than this has no effect.
Almost all safety comments are of the form `// SAFETY:`,
so normalize the rest and fix a few of them that should
have been a `/// # Safety` section instead.
Furthermore, make `tidy` only allow the uppercase form. While
currently `tidy` only checks `core`, it is a good idea to prevent
`core` from drifting to non-uppercase comments, so that later
we can start checking `alloc` etc. too.
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Refactor `get_first_two_components` to `get_next_component`.
Fixes the following behaviour of `parse_prefix`:
- series of separator bytes in a prefix are correctly parsed as a single separator
- device namespace prefixes correctly recognize both `\\` and `/` as separators
