Win: handle \\?\UNC\ prefix in realPathFromHandle (PR43204)

After r361885, realPathFromHandle() ends up getting called on the working
directory on each Clang invocation. This unveiled that the code didn't work for
paths on network shares.

For example, if one maps the local dir c:\src\tmp to x:

  net use x: \\localhost\c$\tmp

and run e.g. "clang -c foo.cc" in x:\, realPathFromHandle will get
\\?\UNC\localhost\c$\src\tmp\ back from GetFinalPathNameByHandleW, and would
strip off the initial \\?\ prefix, ending up with a path that doesn't work.

This patch makes the prefix stripping a little smarter to handle this case.

Differential revision: https://reviews.llvm.org/D67166

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371035 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Windows/Path.inc

@@ -371,13 +371,19 @@ static std::error_code realPathFromHandle(HANDLE H,
   if (std::error_code EC = realPathFromHandle(H, Buffer))
     return EC;
 
-  const wchar_t *Data = Buffer.data();
+  // Strip the \\?\ prefix. We don't want it ending up in output, and such
+  // paths don't get canonicalized by file APIs.
+  wchar_t *Data = Buffer.data();
   DWORD CountChars = Buffer.size();
-  if (CountChars >= 4) {
-    if (0 == ::memcmp(Data, L"\\\\?\\", 8)) {
-      CountChars -= 4;
-      Data += 4;
-    }
+  if (CountChars >= 8 && ::memcmp(Data, L"\\\\?\\UNC\\", 16) == 0) {
+    // Convert \\?\UNC\foo\bar to \\foo\bar
+    CountChars -= 6;
+    Data += 6;
+    Data[0] = '\\';
+  } else if (CountChars >= 4 && ::memcmp(Data, L"\\\\?\\", 8) == 0) {
+    // Convert \\?\c:\foo to c:\foo
+    CountChars -= 4;
+    Data += 4;
   }
 
   // Convert the result from UTF-16 to UTF-8.