I faced a similar question in a Korn shell environment. After trying to be tricky and parse the stinker, I realized that the simple approach was superior:

sub profile
{
    my $self = shift;
    my $profile = shift;
    foreach (`. $profile; env`)
    {
        chomp;
        next unless /=/;
        my ($var, $value) = split(/=/, $_);
        $ENV{$var} = $value;
    }
}
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Pass the path to the source file to the sub and it populates %ENV... I use backtick substitution to get the shell to evaluate the profile and dump its environment in a reliable format. C shell would require some modifications to the details, but the basic structure still stands.

yours,
Michael