1 files changed, 44 insertions, 0 deletions

diff --git a/toxcore/Messenger.c b/toxcore/Messenger.c
index 19bd7edf..43572eff 100644
--- a/toxcore/Messenger.c
+++ b/toxcore/Messenger.c
@@ -2175,3 +2175,47 @@ int get_friendlist(Messenger *m, int **out_list, uint32_t *out_list_length)
     return 0;
 }
 
+/* Return the number of chat in the instance m.
+ * You should use this to determine how much memory to allocate
+ * for copy_grouplist. */
+uint32_t count_chatlist(Messenger *m)
+{
+    uint32_t ret = 0;
+    uint32_t i;
+    
+    for (i = 0; i < m->numchats; i++) {
+        ret++;
+    }
+    
+    return ret;
+}
+
+/* Copy a list of valid chat IDs into the array out_list.
+ * If out_list is NULL, returns 0.
+ * Otherwise, returns the number of elements copied.
+ * If the array was too small, the contents
+ * of out_list will be truncated to list_size. */
+uint32_t copy_chatlist(Messenger *m, int *out_list, uint32_t list_size)
+{
+    if (!out_list)
+        return 0;
+    
+    if (m->numchats == 0) {
+        return 0;
+    }
+    
+    uint32_t i;
+    uint32_t ret = 0;
+    
+    for (i = 0; i < m->numchats; i++) {
+        if (i >= list_size) {
+            break; /* Abandon ship */
+        }
+        
+        out_list[i] = i;
+        ret++;
+    }
+    
+    return ret;
+}
+