1 /* Copyright (C) 1992-2015 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <http://www.gnu.org/licenses/>. */ 17 18 #ifndef _ENDIAN_H 19 #define _ENDIAN_H 1 20 21 #include <features.h> 22 23 /* Definitions for byte order, according to significance of bytes, 24 from low addresses to high addresses. The value is what you get by 25 putting '4' in the most significant byte, '3' in the second most 26 significant byte, '2' in the second least significant byte, and '1' 27 in the least significant byte, and then writing down one digit for 28 each byte, starting with the byte at the lowest address at the left, 29 and proceeding to the byte with the highest address at the right. */ 30 31 #define __LITTLE_ENDIAN 1234 32 #define __BIG_ENDIAN 4321 33 #define __PDP_ENDIAN 3412 34 35 /* This file defines `__BYTE_ORDER' for the particular machine. */ 36 #include <bits/endian.h> 37 38 /* Some machines may need to use a different endianness for floating point 39 values. */ 40 #ifndef __FLOAT_WORD_ORDER 41 # define __FLOAT_WORD_ORDER __BYTE_ORDER 42 #endif 43 44 #ifdef __USE_MISC 45 # define LITTLE_ENDIAN __LITTLE_ENDIAN 46 # define BIG_ENDIAN __BIG_ENDIAN 47 # define PDP_ENDIAN __PDP_ENDIAN 48 # define BYTE_ORDER __BYTE_ORDER 49 #endif 50 51 #if __BYTE_ORDER == __LITTLE_ENDIAN 52 # define __LONG_LONG_PAIR(HI, LO) LO, HI 53 #elif __BYTE_ORDER == __BIG_ENDIAN 54 # define __LONG_LONG_PAIR(HI, LO) HI, LO 55 #endif 56 57 58 #if defined __USE_MISC && !defined __ASSEMBLER__ 59 /* Conversion interfaces. */ 60 # include <bits/byteswap.h> 61 # include <bits/uintn-identity.h> 62 63 # if __BYTE_ORDER == __LITTLE_ENDIAN 64 # define htobe16(x) __bswap_16 (x) 65 # define htole16(x) __uint16_identity (x) 66 # define be16toh(x) __bswap_16 (x) 67 # define le16toh(x) __uint16_identity (x) 68 69 # define htobe32(x) __bswap_32 (x) 70 # define htole32(x) __uint32_identity (x) 71 # define be32toh(x) __bswap_32 (x) 72 # define le32toh(x) __uint32_identity (x) 73 74 # define htobe64(x) __bswap_64 (x) 75 # define htole64(x) __uint64_identity (x) 76 # define be64toh(x) __bswap_64 (x) 77 # define le64toh(x) __uint64_identity (x) 78 79 # else 80 # define htobe16(x) __uint16_identity (x) 81 # define htole16(x) __bswap_16 (x) 82 # define be16toh(x) __uint16_identity (x) 83 # define le16toh(x) __bswap_16 (x) 84 85 # define htobe32(x) __uint32_identity (x) 86 # define htole32(x) __bswap_32 (x) 87 # define be32toh(x) __uint32_identity (x) 88 # define le32toh(x) __bswap_32 (x) 89 90 # define htobe64(x) __uint64_identity (x) 91 # define htole64(x) __bswap_64 (x) 92 # define be64toh(x) __uint64_identity (x) 93 # define le64toh(x) __bswap_64 (x) 94 # endif 95 #endif 96 97 #endif /* endian.h */ 98