endian: provide endian helpers when missing

Not all platforms provide an endian.h. in those cases, define the
byte-order helper functions.

Signed-off-by: Daniel Wagner <[email protected]>

Author: igaw

libnvme/src/meson.build

@@ -26,6 +26,7 @@ else
 endif
 headers = [
     'nvme/accessors.h',
+    'nvme/endian.h',
     'nvme/filters.h',
     'nvme/ioctl.h',
     'nvme/lib-types.h',

libnvme/src/nvme/endian.h

@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * This file is part of libnvme.
+ * Copyright (c) 2026 SUSE Software Solutions
+ *
+ * Authors: Daniel Wagner <[email protected]>
+ */
+
+#pragma once
+
+#if defined(_WIN32) || defined(_WIN64)
+#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+	#define htobe16(x) (x)
+	#define htobe32(x) (x)
+	#define htobe64(x) (x)
+	#define htole16(x) __builtin_bswap16(x)
+	#define htole32(x) __builtin_bswap32(x)
+	#define htole64(x) __builtin_bswap64(x)
+	#define le16toh(x) __builtin_bswap16(x)
+	#define le32toh(x) __builtin_bswap32(x)
+	#define le64toh(x) __builtin_bswap64(x)
+#else
+	/* Little-endian (most common case for Windows) */
+	#define htobe16(x) __builtin_bswap16(x)
+	#define htobe32(x) __builtin_bswap32(x)
+	#define htobe64(x) __builtin_bswap64(x)
+	#define htole16(x) (x)
+	#define htole32(x) (x)
+	#define htole64(x) (x)
+	#define le16toh(x) (x)
+	#define le32toh(x) (x)
+	#define le64toh(x) (x)
+#endif
+#else
+#include <endian.h>
+#endif

libnvme/src/nvme/mi-types.h

@@ -7,9 +7,9 @@
  */
 #pragma once
 
-#include <endian.h>
 #include <stdint.h>
 
+#include <nvme/endian.h>
 #include <nvme/nvme-types.h>
 
 /**

libnvme/src/nvme/nvme-cmds.h

@@ -10,10 +10,10 @@
 
 #pragma once
 
-#include <endian.h>
 #include <errno.h>
 #include <string.h>
 
+#include <nvme/endian.h>
 #include <nvme/ioctl.h>
 #include <nvme/nvme-types.h>
 

libnvme/test/meson.build

@@ -194,6 +194,7 @@ if openssl_dep.found()
 endif
 
 foreach hdr : [
+    'endian',
     'fabrics',
     'filters',
     'ioctl',

nvme.h

@@ -17,7 +17,6 @@
 #define _NVME_H
 
 #include <dirent.h>
-#include <endian.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>