mirror of https://github.com/openssl/openssl.git
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/*
|
|
* Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#ifndef OSSL_INTERNAL_ENDIAN_H
|
|
# define OSSL_INTERNAL_ENDIAN_H
|
|
# pragma once
|
|
|
|
/*
|
|
* IS_LITTLE_ENDIAN and IS_BIG_ENDIAN can be used to detect the endianness
|
|
* at compile time. To use it, DECLARE_IS_ENDIAN must be used to declare
|
|
* a variable.
|
|
*
|
|
* L_ENDIAN and B_ENDIAN can be used at preprocessor time. They can be set
|
|
* in the configarion using the lib_cppflags variable. If neither is
|
|
* set, it will fall back to code works with either endianness.
|
|
*/
|
|
|
|
# if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__)
|
|
# define DECLARE_IS_ENDIAN const int ossl_is_little_endian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
|
|
# define IS_LITTLE_ENDIAN (ossl_is_little_endian)
|
|
# define IS_BIG_ENDIAN (!ossl_is_little_endian)
|
|
# if defined(L_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__)
|
|
# error "L_ENDIAN defined on a big endian machine"
|
|
# endif
|
|
# if defined(B_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
|
|
# error "B_ENDIAN defined on a little endian machine"
|
|
# endif
|
|
# if !defined(L_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
|
|
# define L_ENDIAN
|
|
# endif
|
|
# if !defined(B_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__)
|
|
# define B_ENDIAN
|
|
# endif
|
|
# else
|
|
# define DECLARE_IS_ENDIAN \
|
|
const union { \
|
|
long one; \
|
|
char little; \
|
|
} ossl_is_endian = { 1 }
|
|
|
|
# define IS_LITTLE_ENDIAN (ossl_is_endian.little != 0)
|
|
# define IS_BIG_ENDIAN (ossl_is_endian.little == 0)
|
|
# endif
|
|
|
|
#endif
|