__isctype
#define isalnum(c) __isctype((c), _ISalnum)
#define isalpha(c) __isctype((c), _ISalpha)
#define isblank(c) __isctype((c), _ISblank)
#define iscntrl(c) __isctype((c), _IScntrl)
#define isdigit(c) __isctype((c), _ISdigit)
#define islower(c) __isctype((c), _ISlower)
#define isgraph(c) __isctype((c), _ISgraph)
#define isprint(c) __isctype((c), _ISprint)
#define ispunct(c) __isctype((c), _ISpunct)
#define isspace(c) __isctype((c), _ISspace)
#define isupper(c) __isctype((c), _ISupper)
#define isxdigit(c) __isctype((c), _ISxdigit)
return __isctype(wc, charClass);
return __isctype(wc, charClass);