llist utils: Added sdb_llist_remove_by_name().

[sysdb.git] / src / utils / llist.c

diff --git a/src/utils/llist.c b/src/utils/llist.c
index 64f7d0c1bd9d4ba096d4878f9e64c198cfbff4f8..069c14eee204c6f6570286dc0d9a46532a5f747b 100644 (file)
--- a/src/utils/llist.c
+++ b/src/utils/llist.c
@@ -25,6 +25,10 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#if HAVE_CONFIG_H
+#      include "config.h"
+#endif /* HAVE_CONFIG_H */
+
 #include "utils/llist.h"
 
 #include <assert.h>
@@ -304,6 +308,23 @@ sdb_llist_insert_sorted(sdb_llist_t *list,
        return status;
 } /* sdb_llist_insert_sorted */
 
+sdb_object_t *
+sdb_llist_get(sdb_llist_t *list, size_t i)
+{
+       sdb_llist_elem_t *elem;
+       size_t j;
+
+       if ((! list) || (i >= list->length))
+               return NULL;
+
+       for (elem = list->head, j = 0; j < i; elem = elem->next, ++j)
+               /* iterate */;
+
+       assert(elem);
+       sdb_object_ref(elem->obj);
+       return elem->obj;
+} /* sdb_llist_get */
+
 sdb_object_t *
 sdb_llist_search(sdb_llist_t *list,
                sdb_llist_lookup_cb lookup, const void *user_data)
@@ -362,6 +383,29 @@ sdb_llist_remove(sdb_llist_t *list,
        return obj;
 } /* sdb_llist_remove */
 
+sdb_object_t *
+sdb_llist_remove_by_name(sdb_llist_t *list, const char *key)
+{
+       sdb_llist_elem_t *elem;
+       sdb_object_t *obj = NULL;
+
+       if (! list)
+               return NULL;
+
+       pthread_rwlock_rdlock(&list->lock);
+
+       for (elem = list->head; elem; elem = elem->next)
+               if ((key == elem->obj->name)
+                               || (! strcasecmp(elem->obj->name, key)))
+                       break;
+
+       if (elem)
+               obj = sdb_llist_remove_elem(list, elem);
+       pthread_rwlock_unlock(&list->lock);
+
+       return obj;
+} /* sdb_llist_remove_by_name */
+
 sdb_object_t *
 sdb_llist_shift(sdb_llist_t *list)
 {
@@ -427,6 +471,11 @@ sdb_llist_iter_get_next(sdb_llist_iter_t *iter)
 
        pthread_rwlock_rdlock(&iter->list->lock);
 
+       /* XXX: increment ref-cnt for this object?
+        *      also: when letting an element take ownership of next and prev
+        *      elements, this might be a fairly cheap way to implement a weak
+        *      type of snapshotting */
+
        obj = iter->elem->obj;
        iter->elem = iter->elem->next;