util-lib: add ordered_set_ensure_allocated()

ordered_set_ensure_allocated() does for an OrderedSet, what
set_ensure_allicated() does for a Set.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/basic/ordered-set.h b/src/basic/ordered-set.h
index 6c617ab305..da10e90ff2 100644
--- a/src/basic/ordered-set.h
+++ b/src/basic/ordered-set.h
@@ -29,6 +29,17 @@ static inline OrderedSet* ordered_set_new(const struct hash_ops *ops) {
         return (OrderedSet*) ordered_hashmap_new(ops);
 }
 
+static inline int ordered_set_ensure_allocated(OrderedSet **s, const struct hash_ops *ops) {
+        if (*s)
+                return 0;
+
+        *s = ordered_set_new(ops);
+        if (!*s)
+                return -ENOMEM;
+
+        return 0;
+}
+
 static inline OrderedSet* ordered_set_free(OrderedSet *s) {
         ordered_hashmap_free((OrderedHashmap*) s);
         return NULL;