From 508dcdb3035a2ef826e0feda39c7648df25c88ad Mon Sep 17 00:00:00 2001
From: Michael Brown <mcb30@etherboot.org>
Date: Thu, 23 Mar 2006 22:07:21 +0000
Subject: [PATCH] Added container_of().  This seems about the best place to put
 it, since the definition of it uses offsetof(), and the two concepts are
 related.

---
 src/include/stddef.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/include/stddef.h b/src/include/stddef.h
index ee1f1541..6f91d219 100644
--- a/src/include/stddef.h
+++ b/src/include/stddef.h
@@ -2,12 +2,17 @@
 #define STDDEF_H
 
 /* for size_t */
-#include "stdint.h"
+#include <stdint.h>
 
 #undef NULL
-#define NULL	((void *)0)
+#define NULL ((void *)0)
 
 #undef offsetof
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 
+#undef container_of
+#define container_of(ptr, type, member) ({                      \
+	const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+	(type *)( (char *)__mptr - offsetof(type,member) );})
+
 #endif /* STDDEF_H */