return (c == EOF ? 0 : (_ctype_ + 1)[(unsigned int)c] & (_U|_L));
return (c == EOF ? 0 : ((_ctype_ + 1)[(unsigned char)(c & 0xff)] & (_U|_L)));
isalpha(c)	int c;{	return (c == EOF ? 0 : (_ctype_ + 1)[(unsigned int)c] & (_U|_L));}