--- loncom/cgi/plot.gif 2001/12/20 22:36:15 1.5
+++ loncom/cgi/plot.gif 2016/10/12 18:50:02 1.16
@@ -1,6 +1,6 @@
#!/usr/bin/perl
#
-# $Id: plot.gif,v 1.5 2001/12/20 22:36:15 matthew Exp $
+# $Id: plot.gif,v 1.16 2016/10/12 18:50:02 musolffc Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -24,27 +24,56 @@
#
# http://www.lon-capa.org/
#
-
use strict;
-my $output;
+
+$|=1;
+
my $tmpdir = '/home/httpd/perl/tmp/';
-my $filename = $tmpdir . $ENV{'QUERY_STRING'};
+my %data;
+foreach (split/&/,$ENV{'QUERY_STRING'}) {
+ my ($name,$value)=split/=/;
+ $data{$name}=$value;
+}
+my $filename = $data{'file'};
+# unescape filename
+$filename =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
+die if ($filename =~ /\// || $filename !~ /_plot.data$/);
+$filename = $tmpdir . $filename;
+die "$data{'file'} does not exist\n" if (! -e $filename);
+
+my $output = $data{'output'};
+if ($output eq '') {
+ $output = (split('\.',$0))[-1];
+}
-$output =<<"END";
-Content-type: text/html
+if ($output eq 'gif' || $output eq 'png') {
+ open(my $plot, "gnuplot $filename |");
+ print <<"END";
+Content-type: image/$output
END
+ while (my $line = <$plot>) {
+ print($line);
+ }
-if (0) {
-$output =<<"END";
-Content-type: image/gif
+} elsif ($output eq 'eps') {
+ print <<"END";
+Content-type: text/html
+eps plot creation
+
+Creating eps plot
END
-$output .= `gnuplot $filename`;
+ if (! system ("gnuplot $filename")) {
+ print "An error occurred.
\n".
+ "I am not going to tell you about it as I have not bothered ".
+ "to figure out how to get you the error text.\n";
+ } else {
+ print "EPS file generated successfully.
\n";
+ }
+ print "\n";
+} else {
+ die "output $output is not a recognized value or has no value\n";
}
-print $output;
-
-
-