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