move container_of to types.h

[openocd.git] / src / helper / types.h

diff --git a/src/helper/types.h b/src/helper/types.h
index 79eac13ae7df8796a436086ade7ffcccb0037a7a..a8753c5f149115c539e2e39d3eeb07256344f172 100644 (file)
--- a/src/helper/types.h
+++ b/src/helper/types.h
@@ -23,6 +23,7 @@
 #ifndef TYPES_H
 #define TYPES_H
 
+#include <stddef.h>
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
@@ -58,6 +59,20 @@ typedef bool _Bool;
 #define stringify(s) __stringify(s)
 #define __stringify(s) #s
 
+
+/**
+ * Cast a member of a structure out to the containing structure.
+ * @param ptr The pointer to the member.
+ * @param type The type of the container struct this is embedded in.
+ * @param member The name of the member within the struct.
+ *
+ * This is a mechanism which is used throughout the Linux kernel.
+ */
+#define container_of(ptr, type, member) ({                     \
+       const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+       (type *)( (char *)__mptr - offsetof(type,member) );})
+
+
 /* DANGER!!!! here be dragons!
  *
  * Leave these fn's as byte accesses because it is safe