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/byteswap.h
/* Macros and inline functions to swap the order of bytes in integer values.
   Copyright (C) 1997-2018 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/>.  */

#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
#endif

#ifndef _BITS_BYTESWAP_H
#define _BITS_BYTESWAP_H 1

#include <features.h>
#include <bits/types.h>

/* Swap bytes in 16-bit value.  */
#define __bswap_constant_16(x)					\
  ((__uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))

static __inline __uint16_t
__bswap_16 (__uint16_t __bsx)
{
#if __GNUC_PREREQ (4, 8)
  return __builtin_bswap16 (__bsx);
#else
  return __bswap_constant_16 (__bsx);
#endif
}

/* Swap bytes in 32-bit value.  */
#define __bswap_constant_32(x)					\
  ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8)	\
   | (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))

static __inline __uint32_t
__bswap_32 (__uint32_t __bsx)
{
#if __GNUC_PREREQ (4, 3)
  return __builtin_bswap32 (__bsx);
#else
  return __bswap_constant_32 (__bsx);
#endif
}

/* Swap bytes in 64-bit value.  */
#define __bswap_constant_64(x)			\
  ((((x) & 0xff00000000000000ull) >> 56)	\
   | (((x) & 0x00ff000000000000ull) >> 40)	\
   | (((x) & 0x0000ff0000000000ull) >> 24)	\
   | (((x) & 0x000000ff00000000ull) >> 8)	\
   | (((x) & 0x00000000ff000000ull) << 8)	\
   | (((x) & 0x0000000000ff0000ull) << 24)	\
   | (((x) & 0x000000000000ff00ull) << 40)	\
   | (((x) & 0x00000000000000ffull) << 56))

__extension__ static __inline __uint64_t
__bswap_64 (__uint64_t __bsx)
{
#if __GNUC_PREREQ (4, 3)
  return __builtin_bswap64 (__bsx);
#else
  return __bswap_constant_64 (__bsx);
#endif
}

#endif /* _BITS_BYTESWAP_H */

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