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) 1992-2018 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/>.  */

/*
 *	X/Open Portability Guide 4.2: ftw.h
 */

#ifndef _FTW_H
#define	_FTW_H	1

#include <features.h>

#include <sys/types.h>
#include <sys/stat.h>


__BEGIN_DECLS

/* Values for the FLAG argument to the user function passed to `ftw'
   and 'nftw'.  */
enum
{
  FTW_F,		/* Regular file.  */
#define FTW_F	 FTW_F
  FTW_D,		/* Directory.  */
#define FTW_D	 FTW_D
  FTW_DNR,		/* Unreadable directory.  */
#define FTW_DNR	 FTW_DNR
  FTW_NS,		/* Unstatable file.  */
#define FTW_NS	 FTW_NS

#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED

  FTW_SL,		/* Symbolic link.  */
# define FTW_SL	 FTW_SL
#endif

#ifdef __USE_XOPEN_EXTENDED
/* These flags are only passed from the `nftw' function.  */
  FTW_DP,		/* Directory, all subdirs have been visited. */
# define FTW_DP	 FTW_DP
  FTW_SLN		/* Symbolic link naming non-existing file.  */
# define FTW_SLN FTW_SLN

#endif	/* extended X/Open */
};


#ifdef __USE_XOPEN_EXTENDED
/* Flags for fourth argument of `nftw'.  */
enum
{
  FTW_PHYS = 1,		/* Perform physical walk, ignore symlinks.  */
# define FTW_PHYS	FTW_PHYS
  FTW_MOUNT = 2,	/* Report only files on same file system as the
			   argument.  */
# define FTW_MOUNT	FTW_MOUNT
  FTW_CHDIR = 4,	/* Change to current directory while processing it.  */
# define FTW_CHDIR	FTW_CHDIR
  FTW_DEPTH = 8		/* Report files in directory before directory itself.*/
# define FTW_DEPTH	FTW_DEPTH
# ifdef __USE_GNU
  ,
  FTW_ACTIONRETVAL = 16	/* Assume callback to return FTW_* values instead of
			   zero to continue and non-zero to terminate.  */
#  define FTW_ACTIONRETVAL FTW_ACTIONRETVAL
# endif
};

#ifdef __USE_GNU
/* Return values from callback functions.  */
enum
{
  FTW_CONTINUE = 0,	/* Continue with next sibling or for FTW_D with the
			   first child.  */
# define FTW_CONTINUE	FTW_CONTINUE
  FTW_STOP = 1,		/* Return from `ftw' or `nftw' with FTW_STOP as return
			   value.  */
# define FTW_STOP	FTW_STOP
  FTW_SKIP_SUBTREE = 2,	/* Only meaningful for FTW_D: Don't walk through the
			   subtree, instead just continue with its next
			   sibling. */
# define FTW_SKIP_SUBTREE FTW_SKIP_SUBTREE
  FTW_SKIP_SIBLINGS = 3,/* Continue with FTW_DP callback for current directory
			    (if FTW_DEPTH) and then its siblings.  */
# define FTW_SKIP_SIBLINGS FTW_SKIP_SIBLINGS
};
#endif

/* Structure used for fourth argument to callback function for `nftw'.  */
struct FTW
  {
    int base;
    int level;
  };
#endif	/* extended X/Open */


/* Convenient types for callback functions.  */
typedef int (*__ftw_func_t) (const char *__filename,
			     const struct stat *__status, int __flag);
#ifdef __USE_LARGEFILE64
typedef int (*__ftw64_func_t) (const char *__filename,
			       const struct stat64 *__status, int __flag);
#endif
#ifdef __USE_XOPEN_EXTENDED
typedef int (*__nftw_func_t) (const char *__filename,
			      const struct stat *__status, int __flag,
			      struct FTW *__info);
# ifdef __USE_LARGEFILE64
typedef int (*__nftw64_func_t) (const char *__filename,
				const struct stat64 *__status,
				int __flag, struct FTW *__info);
# endif
#endif

/* Call a function on every element in a directory tree.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
#ifndef __USE_FILE_OFFSET64
extern int ftw (const char *__dir, __ftw_func_t __func, int __descriptors)
     __nonnull ((1, 2));
#else
# ifdef __REDIRECT
extern int __REDIRECT (ftw, (const char *__dir, __ftw_func_t __func,
			     int __descriptors), ftw64) __nonnull ((1, 2));
# else
#  define ftw ftw64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern int ftw64 (const char *__dir, __ftw64_func_t __func,
		  int __descriptors) __nonnull ((1, 2));
#endif

#ifdef __USE_XOPEN_EXTENDED
/* Call a function on every element in a directory tree.  FLAG allows
   to specify the behaviour more detailed.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
# ifndef __USE_FILE_OFFSET64
extern int nftw (const char *__dir, __nftw_func_t __func, int __descriptors,
		 int __flag) __nonnull ((1, 2));
# else
#  ifdef __REDIRECT
extern int __REDIRECT (nftw, (const char *__dir, __nftw_func_t __func,
			      int __descriptors, int __flag), nftw64)
     __nonnull ((1, 2));
#  else
#   define nftw nftw64
#  endif
# endif
# ifdef __USE_LARGEFILE64
extern int nftw64 (const char *__dir, __nftw64_func_t __func,
		   int __descriptors, int __flag) __nonnull ((1, 2));
# endif
#endif

__END_DECLS

#endif	/* ftw.h */

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