[UCRT:LOCALE] Implement __acrt_WideCharToMultiByte

sdk/lib/ucrt/locale/WideCharToMultiByte.c

@@ -0,0 +1,35 @@
+//
+// WideCharToMultiByte.c
+//
+//      Copyright (c) 2024 Timo Kreuzer
+//
+// Definition of __acrt_WideCharToMultiByte.
+//
+// SPDX-License-Identifier: MIT
+//
+
+#include <windows.h>
+//#include <stringapiset.h>
+
+_Success_(return != 0)
+int
+__cdecl
+__acrt_WideCharToMultiByte (
+    _In_ UINT _CodePage,
+    _In_ DWORD _DWFlags,
+    _In_ LPCWSTR _LpWideCharStr,
+    _In_ int _CchWideChar,
+    _Out_writes_opt_(_CbMultiByte) LPSTR _LpMultiByteStr,
+    _In_ int _CbMultiByte,
+    _In_opt_ LPCSTR  _LpDefaultChar,
+    _Out_opt_ LPBOOL  _LpUsedDefaultChar)
+{
+    return WideCharToMultiByte(_CodePage,
+                               _DWFlags,
+                               _LpWideCharStr,
+                               _CchWideChar,
+                               _LpMultiByteStr,
+                               _CbMultiByte,
+                               _LpDefaultChar,
+                               _LpUsedDefaultChar);
+}

sdk/lib/ucrt/locale/locale.cmake

@@ -24,4 +24,5 @@ list(APPEND UCRT_LOCALE_SOURCES
     locale/nlsdata.cpp
     locale/setlocale.cpp
     locale/wsetlocale.cpp
+    locale/WideCharToMultiByte.c
 )