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045162e5 | 1 | /* |
a28d06f3 | 2 | * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved. |
045162e5 P |
3 | * |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
e23d850f RL |
10 | #ifndef OSSL_INTERNAL_ENDIAN_H |
11 | # define OSSL_INTERNAL_ENDIAN_H | |
3a111aad | 12 | # pragma once |
045162e5 | 13 | |
47690cd4 KR |
14 | /* |
15 | * IS_LITTLE_ENDIAN and IS_BIG_ENDIAN can be used to detect the endiannes | |
16 | * at compile time. To use it, DECLARE_IS_ENDIAN must be used to declare | |
17 | * a variable. | |
18 | * | |
19 | * L_ENDIAN and B_ENDIAN can be used at preprocessor time. They can be set | |
20 | * in the configarion using the lib_cppflags variable. If neither is | |
21 | * set, it will fall back to code works with either endianness. | |
22 | */ | |
23 | ||
24 | # if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) | |
25 | # define DECLARE_IS_ENDIAN const int ossl_is_little_endian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ | |
26 | # define IS_LITTLE_ENDIAN (ossl_is_little_endian) | |
27 | # define IS_BIG_ENDIAN (!ossl_is_little_endian) | |
28 | # if defined(L_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__) | |
29 | # error "L_ENDIAN defined on a big endian machine" | |
30 | # endif | |
31 | # if defined(B_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) | |
32 | # error "B_ENDIAN defined on a little endian machine" | |
33 | # endif | |
34 | # if !defined(L_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) | |
35 | # define L_ENDIAN | |
36 | # endif | |
37 | # if !defined(B_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__) | |
38 | # define B_ENDIAN | |
39 | # endif | |
40 | # else | |
41 | # define DECLARE_IS_ENDIAN \ | |
045162e5 P |
42 | const union { \ |
43 | long one; \ | |
44 | char little; \ | |
45 | } ossl_is_endian = { 1 } | |
46 | ||
47690cd4 KR |
47 | # define IS_LITTLE_ENDIAN (ossl_is_endian.little != 0) |
48 | # define IS_BIG_ENDIAN (ossl_is_endian.little == 0) | |
49 | # endif | |
045162e5 P |
50 | |
51 | #endif |