platform/process/src/../../data/test.dat

##</code><code>##

#!/usr/bin/perl -w
use File::Spec;
my $path = "/platform/process/src/../../common/src/line.c";
print $path,"\n";
$new_path = File::Spec->canonpath($path);
print $new_path, "\n";
$c_path = File::Spec->rel2abs($path,"/platform");
print $c_path, "\n";

output:
/platform/process/src/../../common/src/line.c
/platform/process/src/../../common/src/line.c
/platform/process/src/../../common/src/line.c