-#ifndef _LTTNG_UST_ENDIAN_H
-#define _LTTNG_UST_ENDIAN_H
-
/*
- * lttng/ust-endian.h
+ * SPDX-License-Identifier: MIT
*
- * Copyright 2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+/*
+ * This header defines the following endian macros based on the current
+ * platform endian headers:
*
- * endian.h compatibility layer.
+ * BYTE_ORDER this macro shall have a value equal to one
+ * of the *_ENDIAN macros in this header.
+ * FLOAT_WORD_ORDER this macro shall have a value equal to one
+ * of the *_ENDIAN macros in this header.
+ * LITTLE_ENDIAN if BYTE_ORDER == LITTLE_ENDIAN, the host
+ * byte order is from least significant to
+ * most significant.
+ * BIG_ENDIAN if BYTE_ORDER == BIG_ENDIAN, the host byte
+ * order is from most significant to least
+ * significant.
*
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
- * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ * Direct byte swapping interfaces:
*
- * Permission is hereby granted to use or copy this program
- * for any purpose, provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is granted,
- * provided the above notices are retained, and a notice that the code was
- * modified is included with the above copyright notice.
+ * uint16_t bswap_16(uint16_t x); (* swap bytes 16-bit word *)
+ * uint32_t bswap_32(uint32_t x); (* swap bytes 32-bit word *)
+ * uint64_t bswap_64(uint32_t x); (* swap bytes 64-bit word *)
*/
-#ifdef __linux__
+#ifndef _LTTNG_UST_ENDIAN_H
+#define _LTTNG_UST_ENDIAN_H
+
+#if (defined(__linux__) || defined(__CYGWIN__))
#include <endian.h>
+#include <byteswap.h>
#elif defined(__FreeBSD__)
-#include <machine/endian.h>
+#include <sys/endian.h>
+#define bswap_16(x) bswap16(x)
+#define bswap_32(x) bswap32(x)
+#define bswap_64(x) bswap64(x)
#else
#error "Please add support for your OS."
#endif
+/*
+ * BYTE_ORDER, LITTLE_ENDIAN, and BIG_ENDIAN are only defined on Linux
+ * if __USE_BSD is defined. Force their definition.
+ */
+#ifndef BYTE_ORDER
+#define BYTE_ORDER __BYTE_ORDER
+#endif
+
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif
+
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN __BIG_ENDIAN
+#endif
+
#ifndef FLOAT_WORD_ORDER
#ifdef __FLOAT_WORD_ORDER
#define FLOAT_WORD_ORDER __FLOAT_WORD_ORDER