modernc.org/cc@v1.0.1/v2/headers/linux_386/usr/include/endian.h (about)

     1  /* Copyright (C) 1992-2018 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  #if defined __USE_MISC && !defined __ASSEMBLER__
    58  /* Conversion interfaces.  */
    59  # include <bits/byteswap.h>
    60  # include <bits/uintn-identity.h>
    61  
    62  # if __BYTE_ORDER == __LITTLE_ENDIAN
    63  #  define htobe16(x) __bswap_16 (x)
    64  #  define htole16(x) __uint16_identity (x)
    65  #  define be16toh(x) __bswap_16 (x)
    66  #  define le16toh(x) __uint16_identity (x)
    67  
    68  #  define htobe32(x) __bswap_32 (x)
    69  #  define htole32(x) __uint32_identity (x)
    70  #  define be32toh(x) __bswap_32 (x)
    71  #  define le32toh(x) __uint32_identity (x)
    72  
    73  #  define htobe64(x) __bswap_64 (x)
    74  #  define htole64(x) __uint64_identity (x)
    75  #  define be64toh(x) __bswap_64 (x)
    76  #  define le64toh(x) __uint64_identity (x)
    77  
    78  # else
    79  #  define htobe16(x) __uint16_identity (x)
    80  #  define htole16(x) __bswap_16 (x)
    81  #  define be16toh(x) __uint16_identity (x)
    82  #  define le16toh(x) __bswap_16 (x)
    83  
    84  #  define htobe32(x) __uint32_identity (x)
    85  #  define htole32(x) __bswap_32 (x)
    86  #  define be32toh(x) __uint32_identity (x)
    87  #  define le32toh(x) __bswap_32 (x)
    88  
    89  #  define htobe64(x) __uint64_identity (x)
    90  #  define htole64(x) __bswap_64 (x)
    91  #  define be64toh(x) __uint64_identity (x)
    92  #  define le64toh(x) __bswap_64 (x)
    93  # endif
    94  #endif
    95  
    96  #endif				/* endian.h */