[PATCH v26 0/1] MR10192: kernelbase: Handle extended length path prefix in GetLongPathNameW

[Vishnunithyasoundhar S (＠svishnunithyasoundhar)]

```
Support the \\?\ prefix by skipping it during path resolution while 
preserving it in the output. Added specific handling for extended 
UNC paths (\\?\UNC\) to mirror standard UNC behavior, ensuring 
these paths are treated as network shares and not local devices.

Some paths that use the extended length path were filtered out as UNC 
paths - but not all of them are UNC. There can be UNC path that use
extended length path but not all extended length paths are UNC paths.
```

Signed-off-by: Vishnunithyasoundhar S [e-mail]

--
  v26: fix: extended-file-name support
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10192

[PATCH v26 1/1] fix: extended-file-name support

[Vishnunithyasoundhar S]

From: Vishnunithyasoundhar S <[e-mail]>

Signed-off-by: Vishnunithyasoundhar S <[e-mail]>
---
 dlls/kernelbase/file.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/dlls/kernelbase/file.c b/dlls/kernelbase/file.c
index 83977a2c40b..a4d85133909 100644
--- a/dlls/kernelbase/file.c
+++ b/dlls/kernelbase/file.c
@@ -2116,6 +2116,21 @@ DWORD WINAPI DECLSPEC_HOTPATCH GetLongPathNameW( LPCWSTR shortpath, LPWSTR longp
         return 0;
     }
 
+    /* Handle \\?\ prefix (Extended Length Path) */
+    if (shortpath[0] == '\\' && shortpath[1] == '\\' && shortpath[2] == '?' &&
+        shortpath[3] == '\\') {
+      /* Filter out entended UNC */
+      if (_wcsnicmp(shortpath + 4, L"UNC\\", 4) == 0) {
+        lstrcatW(tmplongpath, L"UNC\\");
+        lp = sp = 8;
+        FIXME("UNC Extended pathname %s\n", debugstr_w(shortpath));
+      }
+      else if (shortpath[4] && shortpath[5] == ':') {
+        tmplongpath[lp++] = shortpath[sp++];
+        tmplongpath[lp++] = shortpath[sp++];
+      }
+    }
+
     if (shortpath[0] == '\\' && shortpath[1] == '\\')
     {
         FIXME( "UNC pathname %s\n", debugstr_w(shortpath) );
-- 
GitLab

https://gitlab.winehq.org/wine/wine/-/merge_requests/10192