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51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/*
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* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_INTERNAL_ENDIAN_H
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# define OSSL_INTERNAL_ENDIAN_H
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/*
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* IS_LITTLE_ENDIAN and IS_BIG_ENDIAN can be used to detect the endiannes
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* at compile time. To use it, DECLARE_IS_ENDIAN must be used to declare
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* a variable.
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*
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* L_ENDIAN and B_ENDIAN can be used at preprocessor time. They can be set
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* in the configarion using the lib_cppflags variable. If neither is
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* set, it will fall back to code works with either endianness.
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*/
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# if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__)
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# define DECLARE_IS_ENDIAN const int ossl_is_little_endian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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# define IS_LITTLE_ENDIAN (ossl_is_little_endian)
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# define IS_BIG_ENDIAN (!ossl_is_little_endian)
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# if defined(L_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__)
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# error "L_ENDIAN defined on a big endian machine"
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# endif
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# if defined(B_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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# error "B_ENDIAN defined on a little endian machine"
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# endif
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# if !defined(L_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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# define L_ENDIAN
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# endif
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# if !defined(B_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__)
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# define B_ENDIAN
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# endif
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# else
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# define DECLARE_IS_ENDIAN \
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const union { \
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long one; \
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char little; \
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} ossl_is_endian = { 1 }
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# define IS_LITTLE_ENDIAN (ossl_is_endian.little != 0)
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# define IS_BIG_ENDIAN (ossl_is_endian.little == 0)
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# endif
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#endif
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