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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 93db7681eb
5 changed files with 52 additions and 9 deletions
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2
src/dat/mcx.c
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@@ -3,12 +3,12 @@
#include "mcx.h"
#include <assert.h>
#include <endian.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "../util/compat/endian.h"
#include "../util/intdef.h"
#define TABLE 0x2000 // table byte size

2
src/dat/nbt.c
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@@ -3,11 +3,11 @@
#include "nbt.h"
#include <assert.h>
#include <endian.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "../util/compat/endian.h"
#include "../util/intdef.h"
#define MAX_DEPTH 512

2
src/dat/nbt.h
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@@ -3,11 +3,11 @@
#pragma once
#include <assert.h>
#include <endian.h>
#include <stdbool.h>
#include <stdlib.h>
#include "../util/atrb.h"
#include "../util/compat/endian.h"
#include "../util/intdef.h"
/* NBT (named binary tag) is a tree data structure. Tags have a numeric type ID, name and a payload.

37
src/util/compat/endian.h
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@@ -1,37 +0,0 @@
/* Copyright (c) 2025 Quinn
* Licensed under the MIT Licence. See LICENSE for details */
#pragma once
#if __has_include(<endian.h>)
#include <endian.h>
#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
#endif