Thank you for the PR. Your changes look good.

For me to accept this PR there are some additional requirements:

• Resolve the (minor) changes I highlighted in my review.

• Verify that your change does indeed fix the issue. The WinFsp testsuite includes the test create_namelen_dotest that checks path component length. Please append to this test checks for paths that contain a character such as あ: one check for a path with MaxComponentLength - 1 such characters that should succeed, one check for a path with MaxComponentLength such characters that should succeed, and one check for a path with MaxComponentLength + 1 such characters that should fail.

  • Your checks should go above this line.
  • You should use the character's code point and not embed the character in the source code directly, because Visual Studio has weird rules about which character set it uses for compilation.
  • If you want to debug your test changes set winfsp-tests as the startup project in Visual Studio and supply create_namelen_test as its command line argument. Place a breakpont on create_namelen_dotest and you are good to go.
  • You should verify that the updated test passes on NTFS. To do this use the command line option --external for winfsp-tests.

• CI tests must pass. However if the updated create_namelen_test reveals a problem in a non-FUSE file system, then I will still accept your PR and fix the non-FUSE file system myself.

• You MUST read and be willing to accept the CONTRIBUTOR AGREEMENT. The agreement gives joint copyright interests in your contributions to you and the original WinFsp author. If you have already accepted the CONTRIBUTOR AGREEMENT you do not need to do so again.

Thank you for your work. Your changes look great. I am merging them in.