_ISALPHA
ctn->ctype |= _ISALPHA;
if (ctn->ctype & (_ISALPHA|_ISDIGIT|_ISXDIGIT))
if ((ctn->ctype & _ISALPHA) &&
(ctn->ctype & (_ISDIGIT|_ISALPHA|_ISXDIGIT)))
ctn->ctype |= (_ISUPPER | _ISALPHA | _ISGRAPH | _ISPRINT);
ctn->ctype |= (_ISLOWER | _ISALPHA | _ISGRAPH | _ISPRINT);
ctn->ctype |= (_ISALPHA | _ISGRAPH | _ISPRINT);
#define _ISALNUM (_ISALPHA | _ISDIGIT)
#define _CTYPE_A _ISALPHA /* Alpha */
DEFN_ISTYPE(alpha, _ISALPHA)