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) 1991-2018 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	_STRINGS_H
#define	_STRINGS_H	1

#include <features.h>
#define __need_size_t
#include <stddef.h>

/* Tell the caller that we provide correct C++ prototypes.  */
#if defined __cplusplus && __GNUC_PREREQ (4, 4)
# define __CORRECT_ISO_CPP_STRINGS_H_PROTO
#endif

__BEGIN_DECLS

#if defined __USE_MISC || !defined __USE_XOPEN2K8
/* Compare N bytes of S1 and S2 (same as memcmp).  */
extern int bcmp (const void *__s1, const void *__s2, size_t __n)
     __THROW __attribute_pure__ __nonnull ((1, 2));

/* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
extern void bcopy (const void *__src, void *__dest, size_t __n)
  __THROW __nonnull ((1, 2));

/* Set N bytes of S to 0.  */
extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1));

/* Find the first occurrence of C in S (same as strchr).  */
# ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
extern "C++"
{
extern char *index (char *__s, int __c)
     __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
extern const char *index (const char *__s, int __c)
     __THROW __asm ("index") __attribute_pure__ __nonnull ((1));

#  if defined __OPTIMIZE__
__extern_always_inline char *
index (char *__s, int __c) __THROW
{
  return __builtin_index (__s, __c);
}

__extern_always_inline const char *
index (const char *__s, int __c) __THROW
{
  return __builtin_index (__s, __c);
}
#  endif
}
# else
extern char *index (const char *__s, int __c)
     __THROW __attribute_pure__ __nonnull ((1));
# endif

/* Find the last occurrence of C in S (same as strrchr).  */
# ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
extern "C++"
{
extern char *rindex (char *__s, int __c)
     __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
extern const char *rindex (const char *__s, int __c)
     __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));

#  if defined __OPTIMIZE__
__extern_always_inline char *
rindex (char *__s, int __c) __THROW
{
  return __builtin_rindex (__s, __c);
}

__extern_always_inline const char *
rindex (const char *__s, int __c) __THROW
{
  return __builtin_rindex (__s, __c);
}
#  endif
}
# else
extern char *rindex (const char *__s, int __c)
     __THROW __attribute_pure__ __nonnull ((1));
# endif
#endif

#if defined __USE_MISC || !defined __USE_XOPEN2K8 || defined __USE_XOPEN2K8XSI
/* Return the position of the first bit set in I, or 0 if none are set.
   The least-significant bit is position 1, the most-significant 32.  */
extern int ffs (int __i) __THROW __attribute_const__;
#endif

/* The following two functions are non-standard but necessary for non-32 bit
   platforms.  */
# ifdef	__USE_MISC
extern int ffsl (long int __l) __THROW __attribute_const__;
__extension__ extern int ffsll (long long int __ll)
     __THROW __attribute_const__;
# endif

/* Compare S1 and S2, ignoring case.  */
extern int strcasecmp (const char *__s1, const char *__s2)
     __THROW __attribute_pure__ __nonnull ((1, 2));

/* Compare no more than N chars of S1 and S2, ignoring case.  */
extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
     __THROW __attribute_pure__ __nonnull ((1, 2));

#ifdef	__USE_XOPEN2K8
/* POSIX.1-2008 extended locale interface (see locale.h).  */
# include <bits/types/locale_t.h>

/* Compare S1 and S2, ignoring case, using collation rules from LOC.  */
extern int strcasecmp_l (const char *__s1, const char *__s2, locale_t __loc)
     __THROW __attribute_pure__ __nonnull ((1, 2, 3));

/* Compare no more than N chars of S1 and S2, ignoring case, using
   collation rules from LOC.  */
extern int strncasecmp_l (const char *__s1, const char *__s2,
			  size_t __n, locale_t __loc)
     __THROW __attribute_pure__ __nonnull ((1, 2, 4));
#endif

__END_DECLS

#if __GNUC_PREREQ (3,4) && __USE_FORTIFY_LEVEL > 0 \
    && defined __fortify_function
/* Functions with security checks.  */
# if defined __USE_MISC || !defined __USE_XOPEN2K8
#  include <bits/strings_fortified.h>
# endif
#endif

#endif	/* strings.h  */

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