1 files changed, 39 insertions, 0 deletions
diff --git a/thirdparty/wslay/wslay_macro.h b/thirdparty/wslay/wslay_macro.h
new file mode 100644
index 0000000000..a06cff98e1
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+++ b/thirdparty/wslay/wslay_macro.h
@@ -0,0 +1,39 @@
+/*
+ * Wslay - The WebSocket Library
+ *
+ * Copyright (c) 2020 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef WSLAY_MACRO_H
+#define WSLAY_MACRO_H
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <wslay/wslay.h>
+
+#include <stddef.h>
+
+#define wslay_struct_of(ptr, type, member)                                     \
+  ((type *)(void *)((char *)(ptr)-offsetof(type, member)))
+
+#endif /* WSLAY_MACRO_H */