1 /* Endian macros for string.h functions 2 Copyright (C) 1992-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _BITS_ENDIAN_H 20 #define _BITS_ENDIAN_H 1 21 22 /* Definitions for byte order, according to significance of bytes, 23 from low addresses to high addresses. The value is what you get by 24 putting '4' in the most significant byte, '3' in the second most 25 significant byte, '2' in the second least significant byte, and '1' 26 in the least significant byte, and then writing down one digit for 27 each byte, starting with the byte at the lowest address at the left, 28 and proceeding to the byte with the highest address at the right. */ 29 30 #define __LITTLE_ENDIAN 1234 31 #define __BIG_ENDIAN 4321 32 #define __PDP_ENDIAN 3412 33 34 /* This file defines `__BYTE_ORDER' for the particular machine. */ 35 #include <bits/endianness.h> 36 37 /* Some machines may need to use a different endianness for floating point 38 values. */ 39 #ifndef __FLOAT_WORD_ORDER 40 # define __FLOAT_WORD_ORDER __BYTE_ORDER 41 #endif 42 43 #if __BYTE_ORDER == __LITTLE_ENDIAN 44 # define __LONG_LONG_PAIR(HI, LO) LO, HI 45 #elif __BYTE_ORDER == __BIG_ENDIAN 46 # define __LONG_LONG_PAIR(HI, LO) HI, LO 47 #endif 48 49 #endif /* bits/endian.h */ 50