s4-ldb: Add separate function to add empty element into ldb_msg

It just adds another element, nothing more.
Caller is responsible to fill-in the added element and
determine how to handle data allocation contexts.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/source4/lib/ldb/common/ldb_msg.c b/source4/lib/ldb/common/ldb_msg.c
index ca7b961953..444ba0a7f4 100644
--- a/source4/lib/ldb/common/ldb_msg.c
+++ b/source4/lib/ldb/common/ldb_msg.c
@@ -114,6 +114,36 @@ struct ldb_val ldb_val_dup(void *mem_ctx, const struct ldb_val *v)
 	return v2;
 }
 
+/**
+ * Adds new empty element to msg->elements
+ */
+static int _ldb_msg_add_el(struct ldb_message *msg,
+			   struct ldb_message_element **return_el)
+{
+	struct ldb_message_element *els;
+
+	/*
+	 * TODO: Find out a way to assert on input parameters.
+	 * msg and return_el must be valid
+	 */
+
+	els = talloc_realloc(msg, msg->elements,
+			     struct ldb_message_element, msg->num_elements + 1);
+	if (!els) {
+		errno = ENOMEM;
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
+	ZERO_STRUCT(els[msg->num_elements]);
+
+	msg->elements = els;
+	msg->num_elements++;
+
+	*return_el = &els[msg->num_elements-1];
+
+	return LDB_SUCCESS;
+}
+
 /*
   add an empty element to a message
 */