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/bits/string_fortified.h
/* Copyright (C) 2004-2018 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 _BITS_STRING_FORTIFIED_H
#define _BITS_STRING_FORTIFIED_H 1

#ifndef _STRING_H
# error "Never use <bits/string_fortified.h> directly; include <string.h> instead."
#endif

#if !__GNUC_PREREQ (5,0)
__warndecl (__warn_memset_zero_len,
	    "memset used with constant zero length parameter; this could be due to transposed parameters");
#endif

__fortify_function void *
__NTH (memcpy (void *__restrict __dest, const void *__restrict __src,
	       size_t __len))
{
  return __builtin___memcpy_chk (__dest, __src, __len,
				 __glibc_objsize0 (__dest));
}

__fortify_function void *
__NTH (memmove (void *__dest, const void *__src, size_t __len))
{
  return __builtin___memmove_chk (__dest, __src, __len,
				  __glibc_objsize0 (__dest));
}

#ifdef __USE_GNU
__fortify_function void *
__NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
		size_t __len))
{
  return __builtin___mempcpy_chk (__dest, __src, __len,
				  __glibc_objsize0 (__dest));
}
#endif


/* The first two tests here help to catch a somewhat common problem
   where the second and third parameter are transposed.  This is
   especially problematic if the intended fill value is zero.  In this
   case no work is done at all.  We detect these problems by referring
   non-existing functions.  */
__fortify_function void *
__NTH (memset (void *__dest, int __ch, size_t __len))
{
  /* GCC-5.0 and newer implements these checks in the compiler, so we don't
     need them here.  */
#if !__GNUC_PREREQ (5,0)
  if (__builtin_constant_p (__len) && __len == 0
      && (!__builtin_constant_p (__ch) || __ch != 0))
    {
      __warn_memset_zero_len ();
      return __dest;
    }
#endif
  return __builtin___memset_chk (__dest, __ch, __len,
				 __glibc_objsize0 (__dest));
}

#ifdef __USE_MISC
# include <bits/strings_fortified.h>

void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
  __THROW __nonnull ((1));

__fortify_function void
__NTH (explicit_bzero (void *__dest, size_t __len))
{
  __explicit_bzero_chk (__dest, __len, __glibc_objsize0 (__dest));
}
#endif

__fortify_function char *
__NTH (strcpy (char *__restrict __dest, const char *__restrict __src))
{
  return __builtin___strcpy_chk (__dest, __src, __glibc_objsize (__dest));
}

#ifdef __USE_XOPEN2K8
__fortify_function char *
__NTH (stpcpy (char *__restrict __dest, const char *__restrict __src))
{
  return __builtin___stpcpy_chk (__dest, __src, __glibc_objsize (__dest));
}
#endif


__fortify_function char *
__NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
		size_t __len))
{
  return __builtin___strncpy_chk (__dest, __src, __len,
				  __glibc_objsize (__dest));
}

#ifdef __USE_XOPEN2K8
# if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
__fortify_function char *
__NTH (stpncpy (char *__dest, const char *__src, size_t __n))
{
  return __builtin___stpncpy_chk (__dest, __src, __n,
				  __glibc_objsize (__dest));
}
# else
extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
			    size_t __destlen) __THROW;
extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
					       size_t __n), stpncpy);

__fortify_function char *
__NTH (stpncpy (char *__dest, const char *__src, size_t __n))
{
  if (__bos (__dest) != (size_t) -1
      && (!__builtin_constant_p (__n) || __n > __bos (__dest)))
    return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
  return __stpncpy_alias (__dest, __src, __n);
}
# endif
#endif


__fortify_function char *
__NTH (strcat (char *__restrict __dest, const char *__restrict __src))
{
  return __builtin___strcat_chk (__dest, __src, __glibc_objsize (__dest));
}


__fortify_function char *
__NTH (strncat (char *__restrict __dest, const char *__restrict __src,
		size_t __len))
{
  return __builtin___strncat_chk (__dest, __src, __len,
				  __glibc_objsize (__dest));
}

#endif /* bits/string_fortified.h */

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