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-rw-r--r--source4/lib/ldb/common/ldb_msg.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/source4/lib/ldb/common/ldb_msg.c b/source4/lib/ldb/common/ldb_msg.c
index 4c903cf936..7a6dea049a 100644
--- a/source4/lib/ldb/common/ldb_msg.c
+++ b/source4/lib/ldb/common/ldb_msg.c
@@ -456,3 +456,58 @@ struct ldb_message *ldb_msg_canonicalize(struct ldb_context *ldb,
return msg2;
}
+
+
+/*
+ return a ldb_message representing the differences between msg1 and msg2. If you
+ then use this in a ldb_modify() call it can be used to save edits to a message
+*/
+struct ldb_message *ldb_msg_diff(struct ldb_context *ldb,
+ struct ldb_message *msg1,
+ struct ldb_message *msg2)
+{
+ struct ldb_message *mod;
+ struct ldb_message_element *el;
+ unsigned int i;
+
+ mod = ldb_msg_new(ldb);
+
+ mod->dn = msg1->dn;
+ mod->num_elements = 0;
+ mod->elements = NULL;
+
+ msg2 = ldb_msg_canonicalize(ldb, msg2);
+ if (msg2 == NULL) {
+ return NULL;
+ }
+
+ /* look in msg2 to find elements that need to be added
+ or modified */
+ for (i=0;i<msg2->num_elements;i++) {
+ el = ldb_msg_find_element(msg1, msg2->elements[i].name);
+
+ if (el && ldb_msg_element_compare(el, &msg2->elements[i]) == 0) {
+ continue;
+ }
+
+ if (ldb_msg_add(ldb, mod,
+ &msg2->elements[i],
+ el?LDB_FLAG_MOD_REPLACE:LDB_FLAG_MOD_ADD) != 0) {
+ return NULL;
+ }
+ }
+
+ /* look in msg1 to find elements that need to be deleted */
+ for (i=0;i<msg1->num_elements;i++) {
+ el = ldb_msg_find_element(msg2, msg1->elements[i].name);
+ if (!el) {
+ if (ldb_msg_add_empty(ldb, mod,
+ msg1->elements[i].name,
+ LDB_FLAG_MOD_DELETE) != 0) {
+ return NULL;
+ }
+ }
+ }
+
+ return mod;
+}