_CTYPE_A
#define _A _CTYPE_A
_ISCTYPE_FUNC(alnum, (_CTYPE_A|_CTYPE_D))
_ISCTYPE_FUNC(alpha, _CTYPE_A)
#define isalnum(c) ((int)((_ctype_tab_ + 1)[(c)] & (_CTYPE_A|_CTYPE_D)))
#define isalpha(c) ((int)((_ctype_tab_ + 1)[(c)] & _CTYPE_A))