_ISSPACE
ctn->ctype |= (_ISBLANK | _ISSPACE);
ctn->ctype |= _ISSPACE;
ctn->ctype |= _ISSPACE;
if ((ctn->ctype & _ISSPACE) && (ctn->ctype & _ISGRAPH))
ctn->ctype |= _ISSPACE;
# define isspace(__a) (_IS(__a,_ISSPACE))
#define _CTYPE_S _ISSPACE /* Space */
DEFN_ISTYPE(space, _ISSPACE)