[PATCH] D113264: [clang] [DirectoryWatcher] Remove leading \\?\ from GetFinalPathNameByHandleW

[Martin Storsjö via Phabricator via cfe-commits]

mstorsjo created this revision.
mstorsjo added a reviewer: aaron.ballman.
mstorsjo requested review of this revision.
Herald added a project: clang.

This is needed for the paths to work when using forward slashes;
this fixes the DirectoryWatcherTests unit tests.

Also allocate missing space for the null terminator, which seems to
have been missing all along (writing the terminator out of bounds).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D113264

Files:
  clang/lib/DirectoryWatcher/windows/DirectoryWatcher-windows.cpp


Index: clang/lib/DirectoryWatcher/windows/DirectoryWatcher-windows.cpp
===================================================================
--- clang/lib/DirectoryWatcher/windows/DirectoryWatcher-windows.cpp
+++ clang/lib/DirectoryWatcher/windows/DirectoryWatcher-windows.cpp
@@ -88,10 +88,15 @@
   // handle to the watcher and performing synchronous operations.
   {
     DWORD Size = GetFinalPathNameByHandleW(DirectoryHandle, NULL, 0, 0);
-    std::unique_ptr<WCHAR[]> Buffer{new WCHAR[Size]};
+    std::unique_ptr<WCHAR[]> Buffer{new WCHAR[Size+1]};
     Size = GetFinalPathNameByHandleW(DirectoryHandle, Buffer.get(), Size, 0);
     Buffer[Size] = L'\0';
-    llvm::sys::windows::UTF16ToUTF8(Buffer.get(), Size, Path);
+    WCHAR *Data = Buffer.get();
+    if (Size >= 4 && ::memcmp(Data, L"\\\\?\\", 8) == 0) {
+      Data += 4;
+      Size -= 4;
+    }
+    llvm::sys::windows::UTF16ToUTF8(Data, Size, Path);
   }
 
   size_t EntrySize = sizeof(FILE_NOTIFY_INFORMATION) + MAX_PATH * sizeof(WCHAR);


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