X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=lib%2Fshash.c;h=5257de12aad4c4df7acb03809224e1e0bdd70e0c;hb=5e4641a147c3e450a56b199b9066f1af75c2f779;hp=c35164bd92e277b98e5599c46f41f92485f909f5;hpb=07423999f1759af064316aa4c1a1f499322c5ddc;p=openvswitch

diff --git a/lib/shash.c b/lib/shash.c
index c35164bd..5257de12 100644
--- a/lib/shash.c
+++ b/lib/shash.c
@@ -67,15 +67,26 @@ shash_count(const struct shash *shash)
 /* It is the caller's responsibility to avoid duplicate names, if that is
  * desirable. */
 struct shash_node *
-shash_add(struct shash *sh, const char *name, void *data)
+shash_add(struct shash *sh, const char *name, const void *data)
 {
     struct shash_node *node = xmalloc(sizeof *node);
     node->name = xstrdup(name);
-    node->data = data;
+    node->data = (void *) data;
     hmap_insert(&sh->map, &node->node, hash_name(name));
     return node;
 }
 
+bool
+shash_add_once(struct shash *sh, const char *name, const void *data)
+{
+    if (!shash_find(sh, name)) {
+        shash_add(sh, name, data);
+        return true;
+    } else {
+        return false;
+    }
+}
+
 void
 shash_delete(struct shash *sh, struct shash_node *node)
 {