ropes: Fix a buffer overflow in `RopeBuffer.add`.

[nit.git] / lib / standard / ropes.nit

diff --git a/lib/standard/ropes.nit b/lib/standard/ropes.nit
index 9ef2f4d..d41c021 100644 (file)
--- a/lib/standard/ropes.nit
+++ b/lib/standard/ropes.nit
@@ -337,14 +337,13 @@ class RopeBuffer
 
        redef fun add(c) do
                var rp = rpos
-               length += 1
-               ns[rp] = c
-               rp += 1
-               if rp == buf_size then
-                       rpos = rp
+               if rp >= buf_size then
                        dump_buffer
                        rp = 0
                end
+               ns[rp] = c
+               rp += 1
+               length += 1
                rpos = rp
        end