RFR: 8355342: File.getCanonicalPath on Java 24 resolves paths on network drives to UNC format [v9]

[Alan Bateman]

On Tue, 28 Oct 2025 21:48:38 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> `File.getCanonicalPath` invokes `GetFinalPathNameByHandle` on the result of `canonicalize0` which causes the drive letter of a mapped drive to be converted to a UNC prefix. If such a substitution is detected, this request proposes to revert the conversion of drive letter to UNC prefix before returning the canonical path.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8355342: Resize buffer passed to GetFinalPathNameByHandleW if needed

src/java.base/windows/native/libjava/canonicalize_md.c line 200:

> 198:    have been converted to native form already, via JVM_NativePath().  This is
> 199:    necessary because _fullpath() rejects duplicate separator characters on
> 200:    Win95, though it accepts them on NT. */

What would you think about replacing this function description while it is fresh in our heads?

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PR Review Comment: https://git.openjdk.org/jdk/pull/27324#discussion_r2473740438