fix runtime warnings

diff --git a/cgis/osm-map.pl b/cgis/osm-map.pl
index b5157dc902347a82b5e1d74cfc002af88c7af304..f4d50f0039ec5b2953c857c7f398e30303ba5133 100755 (executable)
--- a/cgis/osm-map.pl
+++ b/cgis/osm-map.pl
@@ -22,34 +22,35 @@ my $mlat = -999.0;
 my $zoom = -1;
 my $baselayer = undef;
 if (defined(param('lon'))) {
-  $lon = param('lon');
+  $lon = param('lon') || '';
   unless ($lon =~ m/^-{0,1}\d+\.\d+$/) { $lon = -999.0; }
   if (($lon < -180.0) || ($lon > 180.0)) { $lon = -999.0; }
 }
 if (defined(param('lat'))) {
-  $lat = param('lat');
+  $lat = param('lat') || '';
   unless ($lat =~ m/^-{0,1}\d+\.\d+$/) { $lat = -999.0; }
   if (($lat < -90.0) || ($lat > 90.0)) { $lat = -999.0; }
 }
 if (defined(param('mlon'))) {
-  $mlon = param('mlon');
+  $mlon = param('mlon') || '';
   unless ($mlon =~ m/^-{0,1}\d+\.\d+$/) { $mlon = -999.0; }
   if (($mlon < -180.0) || ($mlon > 180.0)) { $mlon = -999.0; }
 }
 if (defined(param('mlat'))) {
-  $mlat = param('mlat');
+  $mlat = param('mlat') || '';
   unless ($mlat =~ m/^-{0,1}\d+\.\d+$/) { $mlat = -999.0; }
   if (($mlat < -90.0) || ($mlat > 90.0)) { $mlat = -999.0; }
 }
 if (defined(param('zoom'))) {
-  $zoom = param('zoom');
+  $zoom = param('zoom') || '';
   unless ($zoom =~ m/^\d+$/) { $zoom = -1; }
   if (($zoom < 0) || ($zoom > 30)) { $lat = -1; }
 }
 if (defined(param('layers'))) {
   # Mapping for Openlayers Permalinks
   my @layerlist = ('osmde', 'osmorg', 'osmorglowzoom', 'luftbilderl');
-  my $layers = param('layers');
+  my $layers = param('layers') || '';
+  $layers .= '       '; # Just append spaces so we do not get warnings if the string was too short.
   my $i;
   for ($i = 0; $i < int(@layerlist); $i++) {
     if (substr($layers, $i, 1) eq 'B') { # This is our baselayer
@@ -59,7 +60,7 @@ if (defined(param('layers'))) {
 }
 if (defined(param('layer'))) {
   # Mapping for Leaflet Permalinks
-  my $layers = param('layer');
+  my $layers = param('layer') || '';
   if ($layers eq 'RRZE tileserver osm.de style tiles') { $baselayer = 'osmde'; }
   if ($layers eq 'RRZE tileserver osm.org style tiles') { $baselayer = 'osmorg'; }
   if ($layers eq 'RRZE tileserver osm.org style with different lowzoom tiles') { $baselayer = 'osmorglowzoom'; }