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authorAnthony Liguori <aliguori@us.ibm.com>2009-11-11 10:48:51 -0600
committerAnthony Liguori <aliguori@us.ibm.com>2009-11-17 08:49:38 -0600
commit033815fe14e9e6254f1483113a6dd6d5b130ef58 (patch)
treeff265c330560540c6ce6b3386b5ac21989ef08f5 /qlist.c
parentc99ca93142391a2461afbe07926fa50f1c8f4d9a (diff)
Add operations to qlist to allow it to be used as a stack
This makes lists no longer invariant. It's a very useful bit of functionality though. To deal with the fact that lists are no longer invariant, introduce a deep copy mechanism for lists. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'qlist.c')
-rw-r--r--qlist.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/qlist.c b/qlist.c
index ba2c66c01..5fccb7d09 100644
--- a/qlist.c
+++ b/qlist.c
@@ -37,6 +37,23 @@ QList *qlist_new(void)
return qlist;
}
+static void qlist_copy_elem(QObject *obj, void *opaque)
+{
+ QList *dst = opaque;
+
+ qobject_incref(obj);
+ qlist_append_obj(dst, obj);
+}
+
+QList *qlist_copy(QList *src)
+{
+ QList *dst = qlist_new();
+
+ qlist_iter(src, qlist_copy_elem, dst);
+
+ return dst;
+}
+
/**
* qlist_append_obj(): Append an QObject into QList
*
@@ -67,6 +84,45 @@ void qlist_iter(const QList *qlist,
iter(entry->value, opaque);
}
+QObject *qlist_pop(QList *qlist)
+{
+ QListEntry *entry;
+ QObject *ret;
+
+ if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) {
+ return NULL;
+ }
+
+ entry = QTAILQ_FIRST(&qlist->head);
+ QTAILQ_REMOVE(&qlist->head, entry, next);
+
+ ret = entry->value;
+ qemu_free(entry);
+
+ return ret;
+}
+
+QObject *qlist_peek(QList *qlist)
+{
+ QListEntry *entry;
+ QObject *ret;
+
+ if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) {
+ return NULL;
+ }
+
+ entry = QTAILQ_FIRST(&qlist->head);
+
+ ret = entry->value;
+
+ return ret;
+}
+
+int qlist_empty(const QList *qlist)
+{
+ return QTAILQ_EMPTY(&qlist->head);
+}
+
/**
* qobject_to_qlist(): Convert a QObject into a QList
*/