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　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。 . Prv8 Shell

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/* Routines for dealing with '\0' separated environment vectors
   Copyright (C) 1995-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _ENVZ_H
#define _ENVZ_H	1

#include <features.h>

#include <errno.h>

/* Envz's are argz's too, and should be created etc., using the same
   routines.  */
#include <argz.h>

__BEGIN_DECLS

/* Returns a pointer to the entry in ENVZ for NAME, or 0 if there is none.  */
extern char *envz_entry (const char *__restrict __envz, size_t __envz_len,
			 const char *__restrict __name)
     __THROW __attribute_pure__;

/* Returns a pointer to the value portion of the entry in ENVZ for NAME, or 0
   if there is none.  */
extern char *envz_get (const char *__restrict __envz, size_t __envz_len,
		       const char *__restrict __name)
     __THROW __attribute_pure__;

/* Adds an entry for NAME with value VALUE to ENVZ & ENVZ_LEN.  If an entry
   with the same name already exists in ENVZ, it is removed.  If VALUE is
   NULL, then the new entry will a special null one, for which envz_get will
   return NULL, although envz_entry will still return an entry; this is handy
   because when merging with another envz, the null entry can override an
   entry in the other one.  Null entries can be removed with envz_strip ().  */
extern error_t envz_add (char **__restrict __envz,
			 size_t *__restrict __envz_len,
			 const char *__restrict __name,
			 const char *__restrict __value) __THROW;

/* Adds each entry in ENVZ2 to ENVZ & ENVZ_LEN, as if with envz_add().  If
   OVERRIDE is true, then values in ENVZ2 will supersede those with the same
   name in ENV, otherwise not.  */
extern error_t envz_merge (char **__restrict __envz,
			   size_t *__restrict __envz_len,
			   const char *__restrict __envz2,
			   size_t __envz2_len, int __override) __THROW;

/* Remove the entry for NAME from ENVZ & ENVZ_LEN, if any.  */
extern void envz_remove (char **__restrict __envz,
			 size_t *__restrict __envz_len,
			 const char *__restrict __name) __THROW;

/* Remove null entries.  */
extern void envz_strip (char **__restrict __envz,
			size_t *__restrict __envz_len) __THROW;

__END_DECLS

#endif /* envz.h */

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