#12474: std.fs.Dir.makeOpenPath: optimize case, if path already exists

[QusaiHroub]

Uses a single NtCreateFile syscall on windows, falling back if the parent directory does not exist.

Closes ziglang#12474. Thanks to @joedavis and @matu3ba.

[QusaiHroub]

@Vexu Linux jobs are failing due to a formatting issue, I've updated the PR to fix that.

[andrewrk]

@QusaiHroub would you mind rebasing so that there is not a merge commit in this PR?

[QusaiHroub]

@QusaiHroub would you mind rebasing so that there is not a merge commit in this PR?

Done

[andrewrk]

Thanks!

[squeek502]

Since https://github.com/ziglang/zig/pull/16570 has been merged, this can also usepath.ComponentIterator.

I've made all the necessary changes in my fork here: https://github.com/ziglang/zig/compare/master...squeek502:zig:optimize_std.fs.Dir.makeOpenPath_12474

as well as a few other fixes (fixed leaking intermediate dir handles, reworded the doc comments)

There are a few ways to go here:

• You can rebase your branch on master and cherry pick the commits from my fork
• You can rebase your branch on master and I can submit my changes as a pull request to your branch
• I can submit my branch as a new pull request

Let me know what you'd like to do.

[QusaiHroub]

Since #16570 has been merged, this can also usepath.ComponentIterator.

I've made all the necessary changes in my fork here: master...squeek502:zig:optimize_std.fs.Dir.makeOpenPath_12474

as well as a few other fixes (fixed leaking intermediate dir handles, reworded the doc comments)

There are a few ways to go here:

• You can rebase your branch on master and cherry pick the commits from my fork
• You can rebase your branch on master and I can submit my changes as a pull request to your branch
• I can submit my branch as a new pull request

Let me know what you'd like to do.

Thank you for your work, I chose to go the first way, and I did.

[squeek502]

Thanks for working on this @QusaiHroub!