1 files changed, 41 insertions, 0 deletions
diff --git a/source4/lib/util/util.h b/source4/lib/util/util.h
index cfd77e5a13..f2531aaa85 100644
--- a/source4/lib/util/util.h
+++ b/source4/lib/util/util.h
@@ -82,4 +82,45 @@ extern const char *panic_action;
 #define strlen(x) valgrind_strlen(x)
 #endif
 
+/** 
+ * zero a structure 
+ */
+#ifndef ZERO_STRUCT
+#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
+#endif
+
+/** 
+ * zero a structure given a pointer to the structure 
+ */
+#ifndef ZERO_STRUCTP
+#define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
+#endif
+
+/** 
+ * zero a structure given a pointer to the structure - no zero check 
+ */
+#ifndef ZERO_STRUCTPN
+#define ZERO_STRUCTPN(x) memset((char *)(x), 0, sizeof(*(x)))
+#endif
+
+/* zero an array - note that sizeof(array) must work - ie. it must not be a
+   pointer */
+#ifndef ZERO_ARRAY
+#define ZERO_ARRAY(x) memset((char *)(x), 0, sizeof(x))
+#endif
+
+/**
+ * work out how many elements there are in a static array 
+ */
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
+#endif
+
+/** 
+ * pointer difference macro 
+ */
+#ifndef PTR_DIFF
+#define PTR_DIFF(p1,p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
+#endif
+
 #endif /* _SAMBA_UTIL_H_ */