P2P Add a utility to run a callback on all available groups

This will be useful in wpa_supplicant to match group's SSIDs against a
specific one.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

src/p2p/p2p.h

@@ -1816,6 +1816,19 @@ int p2p_group_is_client_connected(struct p2p_group *group, const u8 *dev_addr);
  */
 const struct p2p_group_config * p2p_group_get_config(struct p2p_group *group);
 
+/**
+ * p2p_loop_on_all_groups - Run the given callback on all groups
+ * @p2p: P2P module context from p2p_init()
+ * @group_callback: The callback function pointer
+ * @user_data: Some user data pointer which can be %NULL
+ *
+ * The group_callback function can stop the iteration by returning 0.
+ */
+void p2p_loop_on_all_groups(struct p2p_data *p2p,
+			    int (*group_callback)(struct p2p_group *group,
+						  void *user_data),
+			    void *user_data);
+
 /**
  * p2p_get_peer_found - Get P2P peer info structure of a found peer
  * @p2p: P2P module context from p2p_init()

src/p2p/p2p_group.c

@@ -1019,3 +1019,17 @@ const struct p2p_group_config * p2p_group_get_config(struct p2p_group *group)
 {
 	return group->cfg;
 }
+
+
+void p2p_loop_on_all_groups(struct p2p_data *p2p,
+			    int (*group_callback)(struct p2p_group *group,
+						  void *user_data),
+			    void *user_data)
+{
+	unsigned int i;
+
+	for (i = 0; i < p2p->num_groups; i++) {
+		if (!group_callback(p2p->groups[i], user_data))
+			break;
+	}
+}