if exists $DB::sub{$name};
    }
    return @ret;
  }
  return keys %DB::sub;
}

####
# first argument is a filename whose subs will be returned
# if a filename is not supplied, all subs in the current
# filename are returned.
#
sub filesubs {
  my $s = shift;
  my $fname = shift;
  $fname = $DB::filename unless $fname;
  return grep { $DB::sub{$_} =~ /^$fname/ } keys %DB::sub;
}

####
# returns a list of all filenames that DB knows about
#
sub files {
  my $s = shift;
  my(@f) = grep(m|^_<|, keys %main::);
  return map { substr($_,2) } @f;
}

####
# returns reference to an array holding the lines in currently
# loaded file
#
sub lines {
  my $s = shift;
  return \@DB::dbline;
}

####
# loadfile($file, $line)
#
sub loadfile {
  my $s = shift;
  my($file, $line) = @_;
  if (!defined $main::{'_<' . $file}) {
    my $try;
    if (($try) = grep(m|^_<.*$file|, keys %main::)) {  
      $file = substr($try,2);
    }
  }
  if (defined($main::{'_<' . $file})) {
    my $c;
#    _outputall("Loading file $file..");
    *DB::dbline = "::_<$file";
    $DB::filename = $file;
    for $c (@clients) {
#      print "2 ", $file, '|', $line, "\n";
      $c->showfile($file, $line);
    }
    return $file;
  }
  return undef;
}

sub lineevents {
  my $s = shift;
  my $fname = shift;
  my(%ret) = ();
  my $i;
  $fname = $DB::filename unless $fname;
  local(*DB::dbline) = "::_<$fname";
  for ($i = 1; $i <= $#DB::dbline; $i++) {
    $ret{$i} = [$DB::dbline[$i], split(/\0/, $DB::dbline{$i})] 
      if defined $DB::dbline{$i};
  }
  return %ret;
}

sub set_break {
  my $s = shift;
  my $i = shift;
  my $cond = shift;
  $i ||= $DB::lineno;
  $cond ||= '1';
  $i = _find_subline($i) if ($i =~ /\D/);
  $s->output("Subroutine not found.\n") unless $i;
  if ($i) {
    if ($DB::dbline[$i] == 0) {
      $s->output("Line $i not breakable.\n");
    }
    else {
      $DB::dbline{$i} =~ s/^[^\0]*/$cond/;
    }
  }
}

sub set_tbreak {
  my $s = shift;
  my $i = shift;
  $i = _find_subline($i) if ($i =~ /\D/);
  $s->output("Subroutine not found.\n") unless $i;