1 files changed, 38 insertions, 0 deletions
diff --git a/lib/Support/Windows/PathV2.inc b/lib/Support/Windows/PathV2.inc
index afb5533dc8..abb53c2ce1 100644
--- a/lib/Support/Windows/PathV2.inc
+++ b/lib/Support/Windows/PathV2.inc
@@ -638,6 +638,44 @@ retry_create_file:
   return success;
 }
 
+error_code canonicalize(const Twine &path, SmallVectorImpl<char> &result) {
+  assert(path::is_absolute(path) && "path must be absolute!");
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+  SmallVector<wchar_t, 128> path_utf16;
+  result.set_size(0);
+
+  // Convert path to UTF-16.
+  if (error_code ec = UTF8ToUTF16(p, path_utf16))
+    return ec;
+
+  DWORD size = ::GetShortPathNameW(c_str(path_utf16), NULL, 0);
+  SmallVector<wchar_t, 128> short_path;
+  short_path.reserve(size + 1);
+  size = ::GetShortPathNameW( c_str(path_utf16)
+                            , short_path.data()
+                            , short_path.capacity());
+  if (!size)
+    return windows_error(::GetLastError());
+
+  short_path.set_size(size);
+
+  size = ::GetLongPathNameW(c_str(short_path), NULL, 0);
+  path_utf16.reserve(size + 1);
+  size = ::GetLongPathNameW( c_str(short_path)
+                           , path_utf16.data()
+                           , path_utf16.capacity());
+  if (!size)
+    return windows_error(::GetLastError());
+
+  path_utf16.set_size(size);
+
+  if (error_code ec = UTF16ToUTF8(path_utf16.data(), path_utf16.size(), result))
+    return ec;
+
+  return success;
+}
+
 error_code get_magic(const Twine &path, uint32_t len,
                      SmallVectorImpl<char> &result) {
   SmallString<128> path_storage;