Restore IsValidDirectory from #20019

Fixes dafb04fb6

src/types/inc/utils.hpp

@@ -128,6 +128,8 @@ namespace Microsoft::Console::Utils
 
     const wchar_t* FindActionableControlCharacter(const wchar_t* beg, const size_t len) noexcept;
 
+    bool IsValidDirectory(const wchar_t* path) noexcept;
+
     // Same deal, but in TerminalPage::_evaluatePathForCwd
     std::wstring EvaluateStartingDirectory(std::wstring_view cwd, std::wstring_view startingDirectory);
 

src/types/utils.cpp

@@ -1237,6 +1237,19 @@ plainSearch:
     return it;
 }
 
+// Returns true if it's a valid path to a directory.
+bool Utils::IsValidDirectory(const wchar_t* path) noexcept
+{
+    if (path == nullptr || *path == L'\0')
+    {
+        return false;
+    }
+
+    WIN32_FILE_ATTRIBUTE_DATA data;
+    const auto ok = GetFileAttributesExW(path, GetFileExInfoStandard, &data);
+    return ok && (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
+}
+
 #pragma warning(pop)
 
 std::wstring Utils::EvaluateStartingDirectory(