From f0257343c7bfbb6532178b8624dd402775373bd7 Mon Sep 17 00:00:00 2001
From: Thadeu Lima de Souza Cascardo <cascardo@cascardo.info>
Date: Wed, 17 Jul 2013 18:34:44 -0300
Subject: [PATCH] Implement adding a friend to a group.

---
 src/group.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/group.c b/src/group.c
index 3566557..41bfb07 100644
--- a/src/group.c
+++ b/src/group.c
@@ -19,6 +19,7 @@
 #include <sgp/group.h>
 #include <sgp/friend.h>
 #include <stdlib.h>
+#include <errno.h>
 
 struct sgp_group {
 	struct sgp_friend **friends;
@@ -34,8 +35,24 @@ struct sgp_group * sgp_group_new()
 	return group;
 }
 
+/*
+ * TODO: start using references. The group can't take it if we want to
+ * add a friend to more groups. A single global reference for all
+ * friends may be good enough.
+ */
 int sgp_group_add_friend(struct sgp_group *group, struct sgp_friend *friend)
 {
+	struct sgp_friend **old_friends;
+	old_friends = group->friends;
+	group->nr_friends++;
+	group->friends = realloc(old_friends,
+				group->nr_friends * sizeof(friend));
+	if (!group->friends) {
+		group->friends = old_friends;
+		group->nr_friends--;
+		return -ENOMEM;
+	}
+	group->friends[group->nr_friends - 1] = friend;
 	return 0;
 }
 
-- 
2.20.1