mdw@git.distorted.org.uk Git - dvdrip/blob - sort-badblocks

   1 #! /usr/bin/perl
   2
   3 use autodie;
   4 use Getopt::Std;
   5
   6 (my $PROG = $0) =~ s!^.*/!!;
   7 sub usage (;\*) {
   8   my ($f) = @_;
   9   $f //= \*STDOUT;
  10   print STDOUT "usage: $PROG [-r LO-HI] FILE ...\n";
  11 }
  12
  13 my ($lo_bound, $hi_bound) = (undef, undef);
  14 my $bogus = 0;
  15 my %opt; $bogus = 1 unless getopts("r:", \%opt);
  16 if (defined $opt{"r"}) {
  17   if ($opt{"r"} =~ /^(\d+)?-(\d+)?$/) { ($lo_bound, $hi_bound) = ($1, $2); }
  18   else { $bogus = 1; }
  19 }
  20 if ($bogus) { usage STDERR; exit 2; }
  21 $lo_bound //= 0;
  22
  23 my @bad;
  24
  25 LINE: while (<>) {
  26   chomp; s/\s*\#.*$//; next LINE if /^$/;
  27   die "bad line" unless /^\s*(\d+)\s*(\d+)\s*$/;
  28   my ($lo, $hi) = ($1, $2);
  29   push @bad, [$lo, $hi];
  30 }
  31
  32 @bad = sort { $a->[0] <=> $b->[0] } @bad;
  33 my ($lo, $hi) = (undef, undef);
  34 sub emit ($$) {
  35   my ($lo, $hi) = @_;
  36   if ($hi <= $lo_bound) { return; }
  37   if (defined $hi_bound && $lo >= $hi_bound) { return; }
  38   if ($lo < $lo_bound) { $lo = $lo_bound; }
  39   if (defined $hi_bound && $hi > $hi_bound) { $hi = $hi_bound; }
  40   printf "%d %d\n", $lo - $lo_bound, $hi - $lo_bound;
  41 }
  42 for my $item (@bad) {
  43   my ($a, $b) = @$item;
  44   if (!defined $lo) { ($lo, $hi) = ($a, $b); }
  45   elsif ($a > $hi) { emit $lo, $hi; ($lo, $hi) = ($a, $b); }
  46   elsif ($b < $lo) { die "buggy piece of shit"; }
  47   else { $hi = $b; }
  48 }
  49 emit $lo, $hi if defined $lo;