/usr/include/endian.h is in libc6-dev 2.27-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | /* 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/>. */
#ifndef _ENDIAN_H
#define _ENDIAN_H 1
#include <features.h>
/* Definitions for byte order, according to significance of bytes,
from low addresses to high addresses. The value is what you get by
putting '4' in the most significant byte, '3' in the second most
significant byte, '2' in the second least significant byte, and '1'
in the least significant byte, and then writing down one digit for
each byte, starting with the byte at the lowest address at the left,
and proceeding to the byte with the highest address at the right. */
#define __LITTLE_ENDIAN 1234
#define __BIG_ENDIAN 4321
#define __PDP_ENDIAN 3412
/* This file defines `__BYTE_ORDER' for the particular machine. */
#include <bits/endian.h>
/* Some machines may need to use a different endianness for floating point
values. */
#ifndef __FLOAT_WORD_ORDER
# define __FLOAT_WORD_ORDER __BYTE_ORDER
#endif
#ifdef __USE_MISC
# define LITTLE_ENDIAN __LITTLE_ENDIAN
# define BIG_ENDIAN __BIG_ENDIAN
# define PDP_ENDIAN __PDP_ENDIAN
# define BYTE_ORDER __BYTE_ORDER
#endif
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define __LONG_LONG_PAIR(HI, LO) LO, HI
#elif __BYTE_ORDER == __BIG_ENDIAN
# define __LONG_LONG_PAIR(HI, LO) HI, LO
#endif
#if defined __USE_MISC && !defined __ASSEMBLER__
/* Conversion interfaces. */
# include <bits/byteswap.h>
# include <bits/uintn-identity.h>
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define htobe16(x) __bswap_16 (x)
# define htole16(x) __uint16_identity (x)
# define be16toh(x) __bswap_16 (x)
# define le16toh(x) __uint16_identity (x)
# define htobe32(x) __bswap_32 (x)
# define htole32(x) __uint32_identity (x)
# define be32toh(x) __bswap_32 (x)
# define le32toh(x) __uint32_identity (x)
# define htobe64(x) __bswap_64 (x)
# define htole64(x) __uint64_identity (x)
# define be64toh(x) __bswap_64 (x)
# define le64toh(x) __uint64_identity (x)
# else
# define htobe16(x) __uint16_identity (x)
# define htole16(x) __bswap_16 (x)
# define be16toh(x) __uint16_identity (x)
# define le16toh(x) __bswap_16 (x)
# define htobe32(x) __uint32_identity (x)
# define htole32(x) __bswap_32 (x)
# define be32toh(x) __uint32_identity (x)
# define le32toh(x) __bswap_32 (x)
# define htobe64(x) __uint64_identity (x)
# define htole64(x) __bswap_64 (x)
# define be64toh(x) __uint64_identity (x)
# define le64toh(x) __bswap_64 (x)
# endif
#endif
#endif /* endian.h */
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