_itowa_word
wnumstr = _itowa_word (num, \
_itowa_word (value, buf, base, upper_case)
wnumstr = _itowa_word (num, wnumbuf + (sizeof wnumbuf) / sizeof (wchar_t), 16,
wexpstr = _itowa_word (exponent,
# define _itoa_word(Val, Buf, Base, Case) _itowa_word (Val, Buf, Base, Case)