int wprintf (const wchar_t *, ...);
int fwprintf (FILE *, const wchar_t *, ...);
-int swprintf (wchar_t *, const wchar_t *, ...);
+int swprintf (wchar_t *, size_t, const wchar_t *, ...);
int vwprintf (const wchar_t *, va_list);
int vfwprintf (FILE *, const wchar_t *, va_list);
-int vswprintf (wchar_t *, const wchar_t *, va_list);
+int vswprintf (wchar_t *, size_t, const wchar_t *, va_list);
int wscanf (const wchar_t *, ...);
int fwscanf (FILE *, const wchar_t *, ...);