#include <locale/localeinfo.h>

--

LOCALE_CTYPE_TOLOWER	offsetof (struct __locale_struct, __ctype_tolower)
LOCALE_CTYPE_TOUPPER	offsetof (struct __locale_struct, __ctype_toupper)
_NL_CTYPE_NONASCII_CASE
LOCALE_DATA_VALUES	offsetof (struct __locale_data, values)
SIZEOF_VALUES		sizeof (((struct __locale_data *) 0)->values[0])