晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/bind9/dns/rdatalist.h
/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */


#ifndef DNS_RDATALIST_H
#define DNS_RDATALIST_H 1

/*****
 ***** Module Info
 *****/

/*! \file dns/rdatalist.h
 * \brief
 * A DNS rdatalist is a list of rdata of a common type and class.
 *
 * MP:
 *\li	Clients of this module must impose any required synchronization.
 *
 * Reliability:
 *\li	No anticipated impact.
 *
 * Resources:
 *\li	TBS
 *
 * Security:
 *\li	No anticipated impact.
 *
 * Standards:
 *\li	None.
 */

#include <isc/lang.h>

#include <dns/types.h>

/*%
 * Clients may use this type directly.
 */
struct dns_rdatalist {
	dns_rdataclass_t		rdclass;
	dns_rdatatype_t			type;
	dns_rdatatype_t			covers;
	dns_ttl_t			ttl;
	ISC_LIST(dns_rdata_t)		rdata;
	ISC_LINK(dns_rdatalist_t)	link;
	/*%<
	 * Case vector.  If the bit is set then the corresponding
	 * character in the owner name needs to be AND'd with 0x20,
	 * rendering that character upper case.
	 */
	unsigned char			upper[32];
};

ISC_LANG_BEGINDECLS

void
dns_rdatalist_init(dns_rdatalist_t *rdatalist);
/*%<
 * Initialize rdatalist.
 *
 * Ensures:
 *\li	All fields of rdatalist have been initialized to their default
 *	values.
 */

isc_result_t
dns_rdatalist_tordataset(dns_rdatalist_t *rdatalist,
			 dns_rdataset_t *rdataset);
/*%<
 * Make 'rdataset' refer to the rdata in 'rdatalist'.
 *
 * Note:
 *\li	The caller must ensure that 'rdatalist' remains valid and unchanged
 *	while 'rdataset' is associated with it.
 *
 * Requires:
 *
 *\li	'rdatalist' is a valid rdatalist.
 *
 *\li	'rdataset' is a valid rdataset that is not currently associated with
 *	any rdata.
 *
 * Ensures,
 *	on success,
 *
 *\li		'rdataset' is associated with the rdata in rdatalist.
 *
 * Returns:
 *\li	#ISC_R_SUCCESS
 */

isc_result_t
dns_rdatalist_fromrdataset(dns_rdataset_t *rdataset,
			   dns_rdatalist_t **rdatalist);
/*%<
 * Point 'rdatalist' to the rdatalist in 'rdataset'.
 *
 * Requires:
 *
 *\li	'rdatalist' is a pointer to a NULL dns_rdatalist_t pointer.
 *
 *\li	'rdataset' is a valid rdataset associated with an rdatalist.
 *
 * Ensures,
 *	on success,
 *
 *\li		'rdatalist' is pointed to the rdatalist in rdataset.
 *
 * Returns:
 *\li	#ISC_R_SUCCESS
 */

ISC_LANG_ENDDECLS

#endif /* DNS_RDATALIST_H */

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