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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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Current File : //usr/include/bind9/isc/endian.h

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#pragma once

#if defined(__DragonFly__) || defined(__FreeBSD__) || \
    defined(__NetBSD__) || defined (__OpenBSD__) || defined(__bsdi__)

# include <sys/endian.h>

/*
 * Recent BSDs should have [bl]e{16,32,64}toh() defined in <sys/endian.h>.
 * Older ones might not, but these should have the alternatively named
 * [bl]etoh{16,32,64}() functions defined.
 */
# ifndef be16toh
#  define be16toh(x) betoh16(x)
#  define le16toh(x) letoh16(x)
#  define be32toh(x) betoh32(x)
#  define le32toh(x) letoh32(x)
#  define be64toh(x) betoh64(x)
#  define le64toh(x) letoh64(x)
# endif /* !be16toh */

#elif defined(_WIN32)

/*
 * Windows is always little-endian and has its own byte-swapping routines, so
 * use these.
 */

# include <stdlib.h>

# define htobe16(x) _byteswap_ushort(x)
# define htole16(x) (x)
# define be16toh(x) _byteswap_ushort(x)
# define le16toh(x) (x)

# define htobe32(x) _byteswap_ulong(x)
# define htole32(x) (x)
# define be32toh(x) _byteswap_ulong(x)
# define le32toh(x) (x)

# define htobe64(x) _byteswap_uint64(x)
# define htole64(x) (x)
# define be64toh(x) _byteswap_uint64(x)
# define le64toh(x) (x)

#elif defined __APPLE__

/*
 * macOS has its own byte-swapping routines, so use these.
 */

# include <libkern/OSByteOrder.h>

# define htobe16(x) OSSwapHostToBigInt16(x)
# define htole16(x) OSSwapHostToLittleInt16(x)
# define be16toh(x) OSSwapBigToHostInt16(x)
# define le16toh(x) OSSwapLittleToHostInt16(x)

# define htobe32(x) OSSwapHostToBigInt32(x)
# define htole32(x) OSSwapHostToLittleInt32(x)
# define be32toh(x) OSSwapBigToHostInt32(x)
# define le32toh(x) OSSwapLittleToHostInt32(x)

# define htobe64(x) OSSwapHostToBigInt64(x)
# define htole64(x) OSSwapHostToLittleInt64(x)
# define be64toh(x) OSSwapBigToHostInt64(x)
# define le64toh(x) OSSwapLittleToHostInt64(x)

#elif defined(sun) || defined(__sun) || defined(__SVR4)

/*
 * For Solaris, rely on the fallback definitions below, though use
 * Solaris-specific versions of bswap_{16,32,64}().
 */

# include <sys/byteorder.h>

# define bswap_16(x) BSWAP_16(x)
# define bswap_32(x) BSWAP_32(x)
# define bswap_64(x) BSWAP_64(x)

#elif defined(__ANDROID__) || defined(__CYGWIN__) || \
      defined(__GNUC__) || defined(__GNU__)

# include <byteswap.h>
# include <endian.h>

#else

#endif /* Specific platform support */

/*
 * Fallback definitions.
 */

#include <inttypes.h>

#ifndef bswap_16
# define bswap_16(x) \
	((uint16_t)((((uint16_t) (x) & 0xff00) >> 8) |			\
		    (((uint16_t) (x) & 0x00ff) << 8)))
#endif /* !bswap_16 */

#ifndef bswap_32
# define bswap_32(x) \
	((uint32_t)((((uint32_t) (x) & 0xff000000) >> 24) |		\
		    (((uint32_t) (x) & 0x00ff0000) >> 8)  |		\
		    (((uint32_t) (x) & 0x0000ff00) << 8)  |		\
		    (((uint32_t) (x) & 0x000000ff) << 24)))
#endif /* !bswap_32 */

#ifndef bswap_64
# define bswap_64(x) \
	((uint64_t)((((uint64_t) (x) & 0xff00000000000000ULL) >> 56) |	\
		    (((uint64_t) (x) & 0x00ff000000000000ULL) >> 40) |	\
		    (((uint64_t) (x) & 0x0000ff0000000000ULL) >> 24) |	\
		    (((uint64_t) (x) & 0x000000ff00000000ULL) >> 8)  |	\
		    (((uint64_t) (x) & 0x00000000ff000000ULL) << 8)  |	\
		    (((uint64_t) (x) & 0x0000000000ff0000ULL) << 24) |	\
		    (((uint64_t) (x) & 0x000000000000ff00ULL) << 40) |	\
		    (((uint64_t) (x) & 0x00000000000000ffULL) << 56)))
#endif /* !bswap_64 */

#ifndef htobe16
# if WORDS_BIGENDIAN

#  define htobe16(x) (x)
#  define htole16(x) bswap_16(x)
#  define be16toh(x) (x)
#  define le16toh(x) bswap_16(x)

# else /* WORDS_BIGENDIAN */

#  define htobe16(x) bswap_16(x)
#  define htole16(x) (x)
#  define be16toh(x) bswap_16(x)
#  define le16toh(x) (x)

# endif /* WORDS_BIGENDIAN */
#endif /* !htobe16 */

#ifndef htobe32
# if WORDS_BIGENDIAN

#  define htobe32(x) (x)
#  define htole32(x) bswap_32(x)
#  define be32toh(x) (x)
#  define le32toh(x) bswap_32(x)

# else /* WORDS_BIGENDIAN */

#  define htobe32(x) bswap_32(x)
#  define htole32(x) (x)
#  define be32toh(x) bswap_32(x)
#  define le32toh(x) (x)

# endif /* WORDS_BIGENDIAN */
#endif /* !htobe32 */

#ifndef htobe64
# if WORDS_BIGENDIAN

#  define htobe64(x) (x)
#  define htole64(x) bswap_64(x)
#  define be64toh(x) (x)
#  define le64toh(x) bswap_64(x)

#else /* WORDS_BIGENDIAN */

#  define htobe64(x) bswap_64(x)
#  define htole64(x) (x)
#  define be64toh(x) bswap_64(x)
#  define le64toh(x) (x)

# endif /* WORDS_BIGENDIAN */
#endif /* !htobe64 */

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