[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/string/wcsdup.cpp

@@ -0,0 +1,60 @@
+//
+// wcsdup.cpp
+//
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+//
+// Defines _wcsdup() and _wcsdup_dbg(), which dynamically allocate a buffer and
+// duplicate a string into it.
+//
+// These functions allocate storage via malloc() or _malloc_dbg().  The caller
+// is responsible for free()ing the returned array.  If the input string is null
+// or if sufficient memory could not be allocated, these functions return null.
+//
+#include <corecrt_internal.h>
+#include <malloc.h>
+#include <string.h>
+
+#ifdef _DEBUG
+
+extern "C" wchar_t* __cdecl _wcsdup(wchar_t const* const string)
+{
+    return _wcsdup_dbg(string, _NORMAL_BLOCK, nullptr, 0);
+}
+
+extern "C" wchar_t* __cdecl _wcsdup_dbg(
+    wchar_t const* const string,
+    int            const block_use,
+    char const*    const file_name,
+    int            const line_number
+    )
+
+#else // ^^^ _DEBUG ^^^ // vvv !_DEBUG vvv //
+
+extern "C" wchar_t* __cdecl _wcsdup(
+    wchar_t const* string
+    )
+
+#endif // !_DEBUG
+{
+    if (string == nullptr)
+        return nullptr;
+
+    size_t const size_in_elements = wcslen(string) + 1;
+
+#ifdef _DEBUG
+    wchar_t* const memory = static_cast<wchar_t*>(_malloc_dbg(
+        size_in_elements * sizeof(wchar_t),
+        block_use,
+        file_name,
+        line_number));
+#else
+    wchar_t* const memory = static_cast<wchar_t*>(malloc(
+        size_in_elements * sizeof(wchar_t)));
+#endif
+
+    if (memory == nullptr)
+        return nullptr;
+
+    _ERRCHECK(wcscpy_s(memory, size_in_elements, string));
+    return memory;
+}