path/filepath: handle \\?\ and \??\ UNC prefixes in VolumeName

On Windows, volumeNameLen treated \\.\UNC paths specially so the
UNC host and share remained part of the volume name. However, \\?\UNC
and \??\UNC are also valid device UNC prefixes, and were previously
handled by the generic device-prefix case. As a result, the volume
ended at the UNC component instead of including the host and share.

Recognize UNC after any supported device prefix and use UNC volume
parsing for all of them.

Updates #58451.

Change-Id: I953a9ed7f755ec83aba78aa501479a3436f8f30b
Reviewed-on: https://go-review.googlesource.com/c/go/+/789100
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
2 files changed
tree: 349b6606c9d5ec7c0c72ca9be64f672f4e0acc4d
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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