type: escape colons in filenames used in rrd commandline

A colon ':' in a legend argument will mark the end of the legend:
http://oss.oetiker.ch/rrdtool/doc/rrdgraph_graph.en.html#INOTES_on_legend_arguments

Reported-by: Benjamin Dupuis <poil@quake.fr>

1 files changed, 3 insertions, 3 deletions

diff --git a/type/GenericStacked.class.php b/type/GenericStacked.class.php
index e9213de..f47af2a 100644
--- a/type/GenericStacked.class.php
+++ b/type/GenericStacked.class.php
@@ -12,9 +12,9 @@ class Type_GenericStacked extends Type_Default {
                 $i=0;
                 foreach ($this->tinstances as $tinstance) {
                         foreach ($this->data_sources as $ds) {
-                                $rrdgraph[] = sprintf('DEF:min_%s=%s:%s:MIN', crc32hex($sources[$i]), $this->files[$tinstance], $ds);
-                                $rrdgraph[] = sprintf('DEF:avg_%s=%s:%s:AVERAGE', crc32hex($sources[$i]), $this->files[$tinstance], $ds);
-                                $rrdgraph[] = sprintf('DEF:max_%s=%s:%s:MAX', crc32hex($sources[$i]), $this->files[$tinstance], $ds);
+                                $rrdgraph[] = sprintf('DEF:min_%s="%s":%s:MIN', crc32hex($sources[$i]), $this->rrd_escape($this->files[$tinstance]), $ds);
+                                $rrdgraph[] = sprintf('DEF:avg_%s="%s":%s:AVERAGE', crc32hex($sources[$i]), $this->rrd_escape($this->files[$tinstance]), $ds);
+                                $rrdgraph[] = sprintf('DEF:max_%s="%s":%s:MAX', crc32hex($sources[$i]), $this->rrd_escape($this->files[$tinstance]), $ds);
                                 $i++;
                         }
                 }