_CTYPE_B
#define isblank(c) __sbistype((c), _CTYPE_B)
#define iswblank(wc) __istype((wc), _CTYPE_B)
XLOCALE_ISCTYPE(blank, _CTYPE_B)
return (__sbistype(c, _CTYPE_B));
return (__istype(wc, _CTYPE_B));
_CTYPE_C|_CTYPE_S|_CTYPE_B,
/*20*/ _CTYPE_S|_CTYPE_B|_CTYPE_R,
_CTYPE_B,
#define _ISBLANK _CTYPE_B