Ticket #1494 - when wrapping at 32bits, the difference is 32bits - last + current, not some massive negative number

1 files changed, 13 insertions, 3 deletions

diff --git a/usr/local/www/graph.php b/usr/local/www/graph.php
index f0230e6..d79a877 100755
--- a/usr/local/www/graph.php
+++ b/usr/local/www/graph.php
@@ -196,9 +196,19 @@ function plot_data(obj) {
     return handle_error();
 
   var diff_ugmt  = ugmt - last_ugmt;
-  var diff_ifin  = ifin - last_ifin;
-  var diff_ifout = ifout - last_ifout;
-
+  if (last_ifin < ifin) {
+    var diff_ifin  = ifin - last_ifin;
+  } else {
+    real_last_ifin = (4294967296 - last_ifin)
+    var diff_ifin  = ifin + real_last_ifin;
+  }
+  if (last_ifout < ifout) {
+    var diff_ifout  = ifout - last_ifout;
+  } else {
+    real_last_ifout = (4294967296 - last_ifout)
+    var diff_ifout  = ifout + real_last_ifout;
+  }
+  
   if (diff_ugmt == 0)
     diff_ugmt = 1;  /* avoid division by zero */