From da536ccc5d3d32f3f952830f25c9647143a26a67 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gabriel=20P=C3=A9rez-Cerezo?= <gabriel@gpcf.eu>
Date: Sat, 25 Jun 2016 15:25:41 +0200
Subject: Checks if account list is long enough before saving account data

---
 init.lua | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/init.lua b/init.lua
index 75cc1db..8addda7 100644
--- a/init.lua
+++ b/init.lua
@@ -1,6 +1,7 @@
 atm = {}
 atm.balance = {}
 atm.pth = minetest.get_worldpath().."/atm_accounts"
+atm.linecount = 0
 
 function atm.showform (player)
    atm.readaccounts()
@@ -34,8 +35,10 @@ end
 
 function atm.readaccounts () 
    local file = io.open(atm.pth, "r")
+   local l = 0
    if file then
       repeat
+	 l = l + 1
 	 local balance = file:read("*n")
 	 if x == nil then
 	    break
@@ -44,6 +47,7 @@ function atm.readaccounts ()
 	 atm.balance[name:sub(2)] = balance
       until file:read(0) == nil
       io.close(file)
+      atm.linecount = l
    else
       atm.balance = {}
    end
@@ -54,12 +58,18 @@ function atm.saveaccounts()
       return
    end
    local data = {}
-   local output = io.open(atm.pth, "w")
+
+   local l
    for k, v in pairs(atm.balance) do
       table.insert(data, string.format("%d %s\n", v, k))
+      l = l+1
+   end
+   if not l < atm.linecount then
+      local output = io.open(atm.pth, "w")
+      output:write(table.concat(data))
+      io.close(output)
    end
-   output:write(table.concat(data))
-   io.close(output)
+
 end
 
 minetest.register_on_joinplayer(function(player)
-- 
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