-/* RN - the "not use sizeof() thing is really annoying!" */
-#if wxUSE_UNICODE
-# if defined(__WINDOWS__)
-# define CHRBITS 16
-# define CHR_MAX 0xfffe
-# else /* !__WINDOWS__ */
-# if defined(__MACH__)
-# define CHRBITS 32
-# define CHR_MAX 0xfffffffe
-# else /* !__MACH__ */
-# if !defined(SIZEOF_WCHAR_T)
-# define CHRBITS 16
-# define CHR_MAX 0xfffe
-# else /* defined(SIZEOF_WCHAR_T) */
-# define CHRBITS SIZEOF_WCHAR_T
-# define CHR_MAX ((1 << CHRBITS) - 1)
-# endif /* !defined(SIZEOF_WCHAR_T) */
-# endif /* defined(__MACH__) */
-# endif /* defined(__WINDOWS__) */
-#else /* !wxUSE_UNICODE */
-# define CHRBITS 8 /* bits in a chr; must not use sizeof */
-# define CHR_MAX 0xfe
-#endif /* wxUSE_UNICODE */
-
+#define CHRBITS (SIZEOF_WCHAR_T << 3) /* bits in a chr; must not use sizeof */
+#define CHR_MAX ((1 << CHRBITS) - 1)