LibC: Implement wmemcpy

Author: https://github.com/timschumi
Commit: 485c0ef691
Pull-request: https://github.com/SerenityOS/serenity/pull/10298
Reviewed-by: https://github.com/bgianfo ✅

Userland/Libraries/LibC/wchar.cpp

@@ -385,4 +385,12 @@ wchar_t* wmemchr(const wchar_t* s, wchar_t c, size_t n)
 
     return nullptr;
 }
+
+wchar_t* wmemcpy(wchar_t* dest, const wchar_t* src, size_t n)
+{
+    for (size_t i = 0; i < n; i++)
+        dest[i] = src[i];
+
+    return dest;
+}
 }

Userland/Libraries/LibC/wchar.h

@@ -44,5 +44,6 @@ int mbsinit(const mbstate_t*);
 wchar_t* wcspbrk(const wchar_t*, const wchar_t*);
 wchar_t* wcsstr(const wchar_t*, const wchar_t*);
 wchar_t* wmemchr(const wchar_t*, wchar_t, size_t);
+wchar_t* wmemcpy(wchar_t*, const wchar_t*, size_t);
 
 __END_DECLS