block-qdict: Tweak qdict_flatten_qdict(), qdict_flatten_qlist()

qdict_flatten_qdict() skips copying scalars from @qdict to @target
when the two are the same.  Fair enough, but it uses a non-obvious
test for "same".  Replace it by the obvious one.  While there, improve
comments.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/qobject/block-qdict.c b/qobject/block-qdict.c
index f32df343e8..a4e1c8d08f 100644
--- a/qobject/block-qdict.c
+++ b/qobject/block-qdict.c
@@ -71,12 +71,15 @@ static void qdict_flatten_qlist(QList *qlist, QDict *target, const char *prefix)
         value = qlist_entry_obj(entry);
         new_key = g_strdup_printf("%s.%i", prefix, i);
 
+        /*
+         * Flatten non-empty QDict and QList recursively into @target,
+         * copy other objects to @target
+         */
         if (qobject_type(value) == QTYPE_QDICT) {
             qdict_flatten_qdict(qobject_to(QDict, value), target, new_key);
         } else if (qobject_type(value) == QTYPE_QLIST) {
             qdict_flatten_qlist(qobject_to(QList, value), target, new_key);
         } else {
-            /* All other types are moved to the target unchanged. */
             qdict_put_obj(target, new_key, qobject_ref(value));
         }
 
@@ -101,9 +104,11 @@ static void qdict_flatten_qdict(QDict *qdict, QDict *target, const char *prefix)
             new_key = g_strdup_printf("%s.%s", prefix, entry->key);
         }
 
+        /*
+         * Flatten non-empty QDict and QList recursively into @target,
+         * copy other objects to @target
+         */
         if (qobject_type(value) == QTYPE_QDICT) {
-            /* Entries of QDicts are processed recursively, the QDict object
-             * itself disappears. */
             qdict_flatten_qdict(qobject_to(QDict, value), target,
                                 new_key ? new_key : entry->key);
             qdict_del(qdict, entry->key);
@@ -111,8 +116,7 @@ static void qdict_flatten_qdict(QDict *qdict, QDict *target, const char *prefix)
             qdict_flatten_qlist(qobject_to(QList, value), target,
                                 new_key ? new_key : entry->key);
             qdict_del(qdict, entry->key);
-        } else if (prefix) {
-            /* All other objects are moved to the target unchanged. */
+        } else if (target != qdict) {
             qdict_put_obj(target, new_key, qobject_ref(value));
             qdict_del(qdict, entry->key);
         }