- while (defined(my $line = <$fh>)) {
- chomp $line;
- my ($k, $v) = split($fs, $line, 2);
- my ($section) = ($k =~ /\A(\S+)\.[^\.]+\z/);
- unless (defined $section_seen{$section}) {
- $section_seen{$section} = 1;
- push @section_order, $section;
- }
-
- my $cur = $rv{$k};
- if (defined $cur) {
+ while (defined($line = <$fh>)) { # perf critical with giant configs
+ $i = index($line, $fs);
+ $k = substr($line, 0, $i);
+ $v = substr($line, $i + 1, -1); # chop off $fs
+ $section = substr($k, 0, rindex($k, '.'));
+ $seen{$section} //= push(@section_order, $section);
+
+ if (defined($cur = $rv{$k})) {