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write a portable version of endian.h, to replace the system's endian.h.

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utilising GNU C standard library for some of the functionality, or GNU C
extensions.
This commit is contained in:
Quinn
2025-08-29 11:46:02 +02:00
parent 8b952fb86f
commit 8a5afd6915
5 changed files with 52 additions and 9 deletions
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80
include/endian.h Normal file
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/* Copyright (c) 2025 Quinn
* Licensed under the MIT Licence. See LICENSE for details */
#ifndef PORTABLE_ENDIAN_H
#define PORTABLE_ENDIAN_H 1
#if defined(__GNUC__)
/* test for the byteswap header */
#if __has_include(<byteswap.h>)
#include <byteswap.h>
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define le16toh(x) (x)
#define le32toh(x) (x)
#define le64toh(x) (x)
#define htole16(x) (x)
#define htole32(x) (x)
#define htole64(x) (x)
#define be16toh(x) __bswap_16(x)
#define be32toh(x) __bswap_32(x)
#define be64toh(x) __bswap_64(x)
#define htobe16(x) __bswap_16(x)
#define htobe32(x) __bswap_32(x)
#define htobe64(x) __bswap_64(x)
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define le16toh(x) __bswap_16(x)
#define le32toh(x) __bswap_32(x)
#define le64toh(x) __bswap_64(x)
#define htole16(x) __bswap_16(x)
#define htole32(x) __bswap_32(x)
#define htole64(x) __bswap_64(x)
#define be16toh(x) (x)
#define be32toh(x) (x)
#define be64toh(x) (x)
#define htobe16(x) (x)
#define htobe32(x) (x)
#define htobe64(x) (x)
#else
#error machine architecture unsupported! Expected either big-endian or little-endian, make sure to use a compiler which defines __BYTE_ORDER__ (like clang or gcc)
#endif /* byte order */
/* otherwise, utilise the compiler built-ins */
#else
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define le16toh(x) __uint16_identity(x)
#define le32toh(x) __uint32_identity(x)
#define le64toh(x) __uint64_identity(x)
#define htole16(x) __uint16_identity(x)
#define htole32(x) __uint32_identity(x)
#define htole64(x) __uint64_identity(x)
#define be16toh(x) __builtin_bswap16(x)
#define be32toh(x) __builtin_bswap32(x)
#define be64toh(x) __builtin_bswap64(x)
#define htobe16(x) __builtin_bswap16(x)
#define htobe32(x) __builtin_bswap32(x)
#define htobe64(x) __builtin_bswap64(x)
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define le16toh(x) __builtin_bswap16(x)
#define le32toh(x) __builtin_bswap32(x)
#define le64toh(x) __builtin_bswap64(x)
#define htole16(x) __builtin_bswap16(x)
#define htole32(x) __builtin_bswap32(x)
#define htole64(x) __builtin_bswap64(x)
#define be16toh(x) __uint16_identity(x)
#define be32toh(x) __uint32_identity(x)
#define be64toh(x) __uint64_identity(x)
#define htobe16(x) __uint16_identity(x)
#define htobe32(x) __uint32_identity(x)
#define htobe64(x) __uint64_identity(x)
#else
#error machine architecture unsupported! Expected either big-endian or little-endian, make sure to use a compiler which defines __BYTE_ORDER__ (like clang or gcc)
#endif /* byte order */
#endif /* has byteswap.h */
#else
#error GNU C is unavailable
#endif /* __GNUC__ */
#endif /* PORTABLE_ENDIAN_H */