Fix crashes when using `std::locale{""}` with an invalid LC_ALL

1 files changed, 27 insertions, 0 deletions

diff --git a/Source/Core/Common/LocaleUtil.cpp b/Source/Core/Common/LocaleUtil.cpp
new file mode 100644
index 0000000000..b6d923f709
--- /dev/null
+++ b/Source/Core/Common/LocaleUtil.cpp
@@ -0,0 +1,27 @@
+// Copyright 2026 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "Common/LocaleUtil.h"
+
+#include <locale.h>
+
+namespace Common
+{
+std::locale GetEnvironmentLocale()
+{
+#ifdef _WIN32
+  if (_locale_t loc = _create_locale(LC_ALL, ""))
+  {
+    _free_locale(loc);
+    return std::locale{""};
+  }
+#else
+  if (locale_t loc = newlocale(LC_ALL_MASK, "", static_cast<locale_t>(0)))
+  {
+    freelocale(loc);
+    return std::locale{""};
+  }
+#endif
+  return std::locale::classic();
+}
+}  // Namespace Common