istream에서 string객체 읽어오기

istream& __getFromStream(string& str, istream& is)
{
	char buf[1024*2];
	const size_t maxlen(sizeof(buf));
	ios_base::iostate istat(is.rdstate());

	str.clear();
	while(istat&ios_base::eofbit)
	{
		*buf=0x00;
		is.getline(buf, maxlen);
		str+=buf;
		istat = is.rdstate();

		if (istat&ios_base::failbit)
		{
			is.clear(istat&~ios_base::failbit);
			continue;
		}

		if (istat&ios_base::goodbit)
		{
			break;
		}
	}

	return is;
}