r18435: added a function talloc_move() which is like talloc_steal(), but is

meant for moving pointers between structures. The difference is that
talloc_move() will zero the source pointer, thus ensuring you don't
reference the pointer in the old context.

talloc_move() is appropriate in some, but not all cases where we use
talloc_steal() now. The interface came out of a discussion with
Jeremy.
(This used to be commit 200756017e1867faa207703eddc00a75ae4527df)

1 files changed, 11 insertions, 0 deletions

diff --git a/source4/lib/talloc/talloc.c b/source4/lib/talloc/talloc.c
index d2f7a5d828..2b80594e80 100644
--- a/source4/lib/talloc/talloc.c
+++ b/source4/lib/talloc/talloc.c
@@ -738,6 +738,17 @@ void *_talloc_steal(const void *new_ctx, const void *ptr)
 }
 
 /*
+  a wrapper around talloc_steal() for situations where you are moving a pointer
+  between two structures, and want the old pointer to be set to NULL
+*/
+void *_talloc_move(const void *new_ctx, const void **pptr)
+{
+	void *ret = _talloc_steal(new_ctx, *pptr);
+	(*pptr) = NULL;
+	return ret;
+}
+
+/*
   return the total size of a talloc pool (subtree)
 */
 size_t talloc_total_size(const void *ptr)