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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/*
 * 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_FIXEDNAME_H
#define DNS_FIXEDNAME_H 1

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

/*! \file dns/fixedname.h
 * \brief
 * Fixed-size Names
 *
 * dns_fixedname_t is a convenience type containing a name, an offsets
 * table, and a dedicated buffer big enough for the longest possible
 * name. This is typically used for stack-allocated names.
 *
 * MP:
 *\li	The caller must ensure any required synchronization.
 *
 * Reliability:
 *\li	No anticipated impact.
 *
 * Resources:
 *\li	Per dns_fixedname_t:
 *\code
 *		sizeof(dns_name_t) + sizeof(dns_offsets_t) +
 *		sizeof(isc_buffer_t) + 255 bytes + structure padding
 *\endcode
 *
 * Security:
 *\li	No anticipated impact.
 *
 * Standards:
 *\li	None.
 */

/*****
 ***** Imports
 *****/

#include <isc/buffer.h>
#include <isc/lang.h>

#include <dns/name.h>

/*****
 ***** Types
 *****/

struct dns_fixedname {
	dns_name_t			name;
	dns_offsets_t			offsets;
	isc_buffer_t			buffer;
	unsigned char			data[DNS_NAME_MAXWIRE];
};

ISC_LANG_BEGINDECLS

void
dns_fixedname_init(dns_fixedname_t *fixed);

void
dns_fixedname_invalidate(dns_fixedname_t *fixed);

dns_name_t *
dns_fixedname_name(dns_fixedname_t *fixed);

dns_name_t *
dns_fixedname_initname(dns_fixedname_t *fixed);

ISC_LANG_ENDDECLS

#endif /* DNS_FIXEDNAME_H */

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