_ISPUNCT
ctn->ctype |= (_ISPUNCT | _ISGRAPH | _ISPRINT);
ctn->ctype |= _ISPUNCT;
(ctn->ctype & (_ISPUNCT|_ISDIGIT)))
if ((ctn->ctype & _ISPUNCT) &&
if ((wc == ' ') && (ctn->ctype & (_ISPUNCT|_ISGRAPH)))