[Bug 57376] New: Permission denied vs No such file or directory when opening folders with trailing backslash

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57376

Bug ID: 57376
           Summary: Permission denied vs No such file or directory when
                    opening folders with trailing backslash
           Product: Wine
           Version: 9.20
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 77346
  --> https://bugs.winehq.org/attachment.cgi?id=77346
A zip file containing a minimal example.c, and log files wine.txt and win.txt

There's a subtle difference when calling fopen(3) between Wine configured for
win10, and real Windows 10. When attempting to open a folder (e.g. AppData),
wine correctly sets errno to 13 (Permission denied), but when opening a folder
with a trailing backslash(e.g. AppData), Windows sets errno to 2 (No such file
or directory) while Wine sets it to 13 (Permission denied). The attached
example.c shows this behavior. I compile it with mingw32-x86_64-gcc and run it
through cmd.exe with my current directory set to C:\users\user on Wine and get
wine.txt, then run it on Windows 10, and get win.txt (COPY a.exe C:\users\user
&& C: && cd users\user && a.exe > win[e].txt)

This behavior exists on current Wine 9.20 and has existed since at least Wine
9.0 .
I have tried the winecfg versions: win10, win11, win8.1, vista, and all seem to
work the same.

My actual use case is running the Luarocks package
manager(https://github.com/luarocks/luarocks) compiled for Windows on Wine for
testing. Luarocks uses this behavior to check if something is a folder
(https://github.com/luarocks/luarocks/blob/master/src/luarocks/fs/win32.lua#L...).

[Bug 57376] Permission denied vs No such file or directory when opening folders with trailing backslash

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57376

Fabian Maurer  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |testcase
                 CC|                            |[e-mail]
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Fabian Maurer  ---
Thanks for the report, I created a MR here:
https://gitlab.winehq.org/wine/wine/-/merge_requests/6759

[Bug 57376] Permission denied vs No such file or directory when opening folders with trailing backslash

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57376

--- Comment #2 from Fabian Maurer  ---
Created attachment 77355
  --> https://bugs.winehq.org/attachment.cgi?id=77355
Testcase