int res_search(const char *name, int class, int type, u_char *answer,
		int anslen)
{
	const char *cp;
	char **domain;
	HEADER *hp = (HEADER *)(void *)answer;
	unsigned dots;
	unsigned state;
	int ret, saved_herrno;
	uint32_t _res_options;
	unsigned _res_ndots;
	char **_res_dnsrch;

	if (!name || !answer) {
		h_errno = NETDB_INTERNAL;
		return -1;
	}

 again:
	__UCLIBC_MUTEX_LOCK(__resolv_lock);
	_res_options = _res.options;
	_res_ndots = _res.ndots;
	_res_dnsrch = _res.dnsrch;
	__UCLIBC_MUTEX_UNLOCK(__resolv_lock);
	if (!(_res_options & RES_INIT)) {
		res_init(); /* our res_init never fails */
		goto again;
	}

	state = 0;
	errno = 0;
	h_errno = HOST_NOT_FOUND;	/* default, if we never query */
	dots = 0;
	for (cp = name; *cp; cp++)
		dots += (*cp == '.');

	if (cp > name && *--cp == '.')
		state |= __TRAILING_DOT;

	/*
	 * If there are dots in the name already, let's just give it a try
	 * 'as is'.  The threshold can be set with the "ndots" option.
	 */
	saved_herrno = -1;
	if (dots >= _res_ndots) {
		ret = res_querydomain(name, NULL, class, type, answer, anslen);
		if (ret > 0)
			return ret;
		saved_herrno = h_errno;
		state |= __TRIED_AS_IS;
	}

	/*
	 * We do at least one level of search if
	 *	- there is no dot and RES_DEFNAME is set, or
	 *	- there is at least one dot, there is no trailing dot,
	 *	  and RES_DNSRCH is set.
	 */
	if ((!dots && (_res_options & RES_DEFNAMES))
	 || (dots && !(state & __TRAILING_DOT) && (_res_options & RES_DNSRCH))
	) {
		bool done = 0;

		for (domain = _res_dnsrch; *domain && !done; domain++) {

			ret = res_querydomain(name, *domain, class, type,
								  answer, anslen);
			if (ret > 0)
				return ret;

			/*
			 * If no server present, give up.
			 * If name isn't found in this domain,
			 * keep trying higher domains in the search list
			 * (if that's enabled).
			 * On a NO_DATA error, keep trying, otherwise
			 * a wildcard entry of another type could keep us
			 * from finding this entry higher in the domain.
			 * If we get some other error (negative answer or
			 * server failure), then stop searching up,
			 * but try the input name below in case it's
			 * fully-qualified.
			 */
			if (errno == ECONNREFUSED) {
				h_errno = TRY_AGAIN;
				return -1;
			}

			switch (h_errno) {
				case NO_DATA:
					state |= __GOT_NODATA;
					/* FALLTHROUGH */
				case HOST_NOT_FOUND:
					/* keep trying */
					break;
				case TRY_AGAIN:
					if (hp->rcode == SERVFAIL) {
						/* try next search element, if any */
						state |= __GOT_SERVFAIL;
						break;
					}
					/* FALLTHROUGH */
				default:
					/* anything else implies that we're done */
					done = 1;
			}
			/*
			 * if we got here for some reason other than DNSRCH,
			 * we only wanted one iteration of the loop, so stop.
			 */
			if (!(_res_options & RES_DNSRCH))
				done = 1;
		}
	}

	/*
	 * if we have not already tried the name "as is", do that now.
	 * note that we do this regardless of how many dots were in the
	 * name or whether it ends with a dot.
	 */
	if (!(state & __TRIED_AS_IS)) {
		ret = res_querydomain(name, NULL, class, type, answer, anslen);
		if (ret > 0)
			return ret;
	}

	/*
	 * if we got here, we didn't satisfy the search.
	 * if we did an initial full query, return that query's h_errno
	 * (note that we wouldn't be here if that query had succeeded).
	 * else if we ever got a nodata, send that back as the reason.
	 * else send back meaningless h_errno, that being the one from
	 * the last DNSRCH we did.
	 */
	if (saved_herrno != -1)
		h_errno = saved_herrno;
	else if (state & __GOT_NODATA)
		h_errno = NO_DATA;
	else if (state & __GOT_SERVFAIL)
		h_errno = TRY_AGAIN;
	return -1;
}
int res_search(const char *name, int class, int type, u_char *answer,
		int anslen)
{
	const char *cp;
	char **domain;
	HEADER *hp = (HEADER *)(void *)answer;
	unsigned dots;
	unsigned state;
	int ret, saved_herrno;
	uint32_t _res_options;
	unsigned _res_ndots;
	char **_res_dnsrch;

	if (!name || !answer) {
		h_errno = NETDB_INTERNAL;
		return -1;
	}

 again:
	__UCLIBC_MUTEX_LOCK(__resolv_lock);
	_res_options = _res.options;
	_res_ndots = _res.ndots;
	_res_dnsrch = _res.dnsrch;
	__UCLIBC_MUTEX_UNLOCK(__resolv_lock);
	if (!(_res_options & RES_INIT)) {
		res_init();  
		goto again;
	}

	state = 0;
	errno = 0;
	h_errno = HOST_NOT_FOUND;	 
	dots = 0;
	for (cp = name; *cp; cp++)
		dots += (*cp == '.');

	if (cp > name && *--cp == '.')
		state |= __TRAILING_DOT;

	 
	saved_herrno = -1;
	if (dots >= _res_ndots) {
		ret = res_querydomain(name, NULL, class, type, answer, anslen);
		if (ret > 0)
			return ret;
		saved_herrno = h_errno;
		state |= __TRIED_AS_IS;
	}

	 
	if ((!dots && (_res_options & RES_DEFNAMES))
	 || (dots && !(state & __TRAILING_DOT) && (_res_options & RES_DNSRCH))
	) {
		bool done = 0;

		for (domain = _res_dnsrch; *domain && !done; domain++) {

			ret = res_querydomain(name, *domain, class, type,
								  answer, anslen);
			if (ret > 0)
				return ret;

			 
			if (errno == ECONNREFUSED) {
				h_errno = TRY_AGAIN;
				return -1;
			}

			switch (h_errno) {
				case NO_DATA:
					state |= __GOT_NODATA;
					 
				case HOST_NOT_FOUND:
					 
					break;
				case TRY_AGAIN:
					if (hp->rcode == SERVFAIL) {
						 
						state |= __GOT_SERVFAIL;
						break;
					}
					 
				default:
					 
					done = 1;
			}
			 
			if (!(_res_options & RES_DNSRCH))
				done = 1;
		}
	}

	 
	if (!(state & __TRIED_AS_IS)) {
		ret = res_querydomain(name, NULL, class, type, answer, anslen);
		if (ret > 0)
			return ret;
	}

	 
	if (saved_herrno != -1)
		h_errno = saved_herrno;
	else if (state & __GOT_NODATA)
		h_errno = NO_DATA;
	else if (state & __GOT_SERVFAIL)
		h_errno = TRY_AGAIN;
	return -1;
}