Fix queue_num_free_elements

Return 0 for an unallocated queue, and return the actual number of events (rather than one too
little).

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

diff --git a/libevdev/libevdev-int.h b/libevdev/libevdev-int.h
index 43cfe8a..5d3502a 100644 (file)
--- a/libevdev/libevdev-int.h
+++ b/libevdev/libevdev-int.h
@@ -208,7 +208,10 @@ queue_size(struct libevdev *dev)
 static inline size_t
 queue_num_free_elements(struct libevdev *dev)
 {
-       return dev->queue_size - dev->queue_next - 1;
+       if (dev->queue_size == 0)
+               return 0;
+
+       return dev->queue_size - dev->queue_next;
 }
 
 static inline struct input_event *