qlist: add qlist_size()

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit a86a4c2f7b7f0b72816ea1c219d8140699b6665b)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

2 files changed, 14 insertions, 0 deletions

diff --git a/qlist.c b/qlist.c
index 88498b157f..b48ec5b914 100644
--- a/qlist.c
+++ b/qlist.c
@@ -124,6 +124,19 @@ int qlist_empty(const QList *qlist)
     return QTAILQ_EMPTY(&qlist->head);
 }
 
+static void qlist_size_iter(QObject *obj, void *opaque)
+{
+    size_t *count = opaque;
+    (*count)++;
+}
+
+size_t qlist_size(const QList *qlist)
+{
+    size_t count = 0;
+    qlist_iter(qlist, qlist_size_iter, &count);
+    return count;
+}
+
 /**
  * qobject_to_qlist(): Convert a QObject into a QList
  */
diff --git a/qlist.h b/qlist.h
index d426bd4a4b..ae776f99c3 100644
--- a/qlist.h
+++ b/qlist.h
@@ -49,6 +49,7 @@ void qlist_iter(const QList *qlist,
 QObject *qlist_pop(QList *qlist);
 QObject *qlist_peek(QList *qlist);
 int qlist_empty(const QList *qlist);
+size_t qlist_size(const QList *qlist);
 QList *qobject_to_qlist(const QObject *obj);
 
 static inline const QListEntry *qlist_first(const QList *qlist)