return (c == EOF ? 0 : (_ctype_ + 1)[(unsigned int)c] & _C);
return (c == EOF ? 0 : ((_ctype_ + 1)[(unsigned char)(c & 0xff)] & _C));
iscntrl(c)	int c;{	return (c == EOF ? 0 : (_ctype_ + 1)[(unsigned int)c] & _C);}