From 38bfbf3479598437101556d8bcdd699d909bae4b Mon Sep 17 00:00:00 2001
From: Geoff Leyland <geoff.leyland@incremental.co.nz>
Date: Sat, 25 Jan 2014 21:38:47 +1300
Subject: [PATCH] whoops, needed to change gcopen as well in the last commit

---
 lua/mmapfile.lua | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lua/mmapfile.lua b/lua/mmapfile.lua
index 8b9d983..b185e5a 100644
--- a/lua/mmapfile.lua
+++ b/lua/mmapfile.lua
@@ -192,8 +192,11 @@ end
 local function gcopen(
   filename,     -- string: name of the file to open.
   type,         -- ?string: type to allocate
-  mode)         -- ?string: open mode for the file "r" or "rw"
-  local addr, size = open(filename, type, mode)
+  mode,         -- ?string: open mode for the file "r" or "rw"
+  size,         -- ?integer: size to map (in multiples of type).  Default
+                -- is file size
+  offset)       -- ?integer: offset into the file (default 0)
+  local addr, size = open(filename, type, mode, size, offset)
   return ffi.gc(addr, close), size
 end