Add SDK/CRT string routines and headers

SDK/CRT/STRING/wmem.c

@@ -0,0 +1,53 @@
+/*++
+
+Copyright (c) 2024, Quinn Stephens.
+Provided under the BSD 3-Clause license.
+
+Module Name:
+
+   wmem.c
+
+Abstract:
+
+   Provides wide memory manipulation routines.
+
+--*/
+
+#include <wchar.h>
+
+wchar_t *
+wmemset (
+    wchar_t *dest,
+    wchar_t c,
+    size_t count
+    )
+
+{
+    void *ptr = dest;
+
+    while (count--) {
+        *(wchar_t *)dest = c;
+        dest = (wchar_t *)dest + 1;
+    }
+
+    return ptr;
+}
+
+wchar_t *
+wmemcpy (
+    wchar_t *dest,
+    const wchar_t *src,
+    size_t count
+    )
+
+{
+    void *ptr = dest;
+
+    while (count--) {
+        *(wchar_t *)dest = *(wchar_t *)src;
+        dest = (wchar_t *)dest + 1;
+        src = (wchar_t *)src + 1;
+    }
+
+    return ptr;
+}