bind-9.11.3/util/update_copyrights

	update_copyrights revision 10e873cb368b0ed17a328e5421a0411eb90da0cb
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont#!/usr/local/bin/perl -w
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont#
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# Copyright (C) 2004, 2005  Internet Systems Consortium, Inc. ("ISC")
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# Copyright (C) 1998-2001  Internet Software Consortium.
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont#
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# Permission to use, copy, modify, and distribute this software for any
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# purpose with or without fee is hereby granted, provided that the above
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# copyright notice and this permission notice appear in all copies.
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont#
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# PERFORMANCE OF THIS SOFTWARE.
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# $Id: update_copyrights,v 1.42 2006/10/24 00:57:16 marka Exp $
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontrequire 5.002;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# Map copyright owners to the files containing copyright messages.
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# The first line of the copyright message is not in the file;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# it is constructed by this script.
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontmy %owner2filename = (
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    "" => "util/COPYRIGHT",
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    "NAI" => "util/COPYRIGHT.NAI",
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    "NOM" => "util/COPYRIGHT.NOM",
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    "BSDI" => "util/COPYRIGHT.BSDI",
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    "BRIEF" => "util/COPYRIGHT.BRIEF",
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    "PORTION" => "util/COPYRIGHT.PORTION",
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# Map each copyright owner name to a reference to an array containing
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont# the lines of the copyright message.
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontmy %owner2text = ();
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontmy $keyword_pat = '\$(Id:.*|Revision:.*|Id|Revision)\$';
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontforeach $owner (keys %owner2filename) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        my $f = $owner2filename{$owner};
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        open(COPYRIGHT, "<$f") || die "can't open $f: $!";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        @copyright_text = <COPYRIGHT>;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        close(COPYRIGHT);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $owner2text{$owner} = [ @copyright_text ];
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont}
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontmy %file_types = ();
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontmy %file_years = ();
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontmy $years_list;
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updatermy $parent;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontwhile (<>) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    chomp;
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater    ($file, $type, $years) = split(/\s+/);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $file_types{$file} = $type;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $file_years{$file} = $years;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont}
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontsub getyears {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $parent = $_[0];
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $parent =~ s/PARENT://;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $years_list = $file_years{$parent};
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater    if (defined($years_list) && $years_list =~ /^PARENT:/) {
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater        print "BAD PARENT:$parent\n";
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater        undefine($years_list);
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater    }
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater}
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontsub docbook {
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater    $parent = $_[0];
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $parent =~ s/\.[^.]*$/.docbook/;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $years_list = $file_years{$parent};
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont}
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontsub copyright {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    my $holder = shift;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    my $result = "";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    return $result unless (@_);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $result = "$result    <copyright>\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $result = "$result      <year>$_</year>\n" foreach (@_);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $result = "$result      <holder>$holder</holder>\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $result = "$result    </copyright>\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    return $result;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont}
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontsub copyrights {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    my $a = copyright("Internet Systems Consortium, Inc. (\"ISC\")",
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont           grep({ $_ >= 2004} @_));
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    my $b = copyright("Internet Software Consortium.",
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont           grep({ $_ < 2004} @_));
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    return "$a$b";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont}
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupontforeach $file (keys %file_types) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $typeandowner = $file_types{$file};
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    $years_list = $file_years{$file};
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        if ( ! -f $file ) {
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater                print "$file: missing\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                next;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        if ($years_list =~ /PARENT:/) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        getyears($years_list);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        if (!defined $years_list) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont            print "$file: has bad parent $parent\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont            next;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    # copyright notice is now generated from the source.
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    next if ($years_list eq "DOCBOOK");
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    if ($years_list eq "DOCBOOK") {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        docbook($file);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        if (!defined $years_list) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont            print "$file: has bad parent $parent\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont            next;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont    }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        @years = split(/,/, $years_list);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        my ($type, $owner) = split(/\./, $typeandowner);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $owner = "" if !defined $owner;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $textp = $owner2text{$owner};
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        if (!defined $textp) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                print "$file: unknown copyright owner $owner\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                next;
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater        }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        next if $type eq "X" or $type eq "BAT";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $before_copyright = "";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $c_comment = 0;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $shell_comment = 0;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $m4_comment = 0;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $sgml_comment = 0;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $zone_comment = 0;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $man_comment = 0;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $start_comment = "";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $end_comment = "";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $first = "";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        if ($type =~ /^(C|YACC|CONF-C)$/) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $c_comment = 1;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $start_comment = "/*\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $prefix = " * ";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $end_comment = " */\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        } elsif ($type =~ /^(SH|PERL|TCL|MAKE|CONF-SH)$/) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $shell_comment = 1;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $prefix = "# ";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        } elsif ($type eq "ZONE" || $type eq "MC") {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $zone_comment = 1;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $prefix = "; ";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        } elsif ($type eq "MAN") {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $man_comment = 1;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $prefix = ".\\\" ";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        } elsif ($type eq "M4") {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $m4_comment = 1;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $prefix = "dnl ";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        } elsif ($type eq "HTML" || $type eq "SGML") {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $sgml_comment = 1;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $start_comment = "<!--\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $prefix = " - ";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $end_comment = "-->\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        } elsif ($type eq "TXT") {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $prefix = "";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        } else {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                print "$file: type '$type' not supported yet; skipping\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                next;
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater        }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        ($nonspaceprefix = $prefix) =~ s/\s+$//;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        open(SOURCE, "<$file") || die "can't open $file: $!";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        $_ = <SOURCE>;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        if ($type eq "YACC") {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                unless ($_ eq "%{\n") {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        print "$file: unexpected yacc file start ",
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                              "(expected \"%{\\n\")\n";
28b3569d6248168e6c00caab951521cc8141a49dAutomatic Updater                        close(SOURCE);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        next;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $before_copyright = "$_";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $_ = <SOURCE>;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        if ($c_comment && /^\/\*/) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                $_ = <SOURCE>;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                if ($_ !~ /[Cc]opyright/) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        print "$file: non-copyright comment\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        close(SOURCE);
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        next;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                if ($_ !~ /\*\//) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        while (<SOURCE>) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                                last if $_ =~ /\*\//;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont        } elsif ($shell_comment) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                if (/^\#\!/) {
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        $before_copyright = "$_#\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        $_ = <SOURCE>;
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                        $_ = <SOURCE> if $_ eq "#\n";
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                }
2a31bd531072824ef252c18303859d6af7451b00Francis Dupont                if (/^\#/) {
                        if ($_ !~ /[Cc]opyright/) {
                                print "$file: non-copyright comment\n";
                                close(SOURCE);
                                next;
                        }
                        while (<SOURCE>) {
                                if ($_ !~ /^\#/) {
                                        $first = $_;
                                        last;
                                }
                        }
                } else {
                        $first = $_;
                }
        } elsif (($m4_comment || $zone_comment || $man_comment) &&
                 /^\Q$nonspaceprefix\E/) {

                while (/^\Q$nonspaceprefix\E\s*$/) {
                        $_ = <SOURCE>;
                }

                if ($_ !~ /[Cc]opyright/) {
                        print "$file: non-copyright comment\n";
                        close(SOURCE);
                        next;
                }
                while (<SOURCE>) {
                        if ($_ !~ /^\Q$nonspaceprefix\E/ ||
                            $_ =~ /$keyword_pat/) {
                                $first = $_;
                                last;
                        }
                }
        } elsif ($sgml_comment) {
                if (/^<!DOCTYPE/) {
                        $before_copyright = $_;
                        $_ = <SOURCE>;
                ;
            while (!eof(SOURCE) && ! /^<!/ ) {
                $before_copyright = "$before_copyright$_";
                $_ = <SOURCE>;
            }
            if (eof(SOURCE)) {
                close(SOURCE);
                next;
            }
                }
                if (/^<!/) {
                        $_ = <SOURCE> if $_ eq "<!--\n";
                        if ($_ !~ /[Cc]opyright/) {
                                print "$file: non-copyright comment\n";
                                close(SOURCE);
                                next;
                        }
                        while (defined($_)) {
                                last if s/.*-->//;
                                $_ = <SOURCE>;
                        }
                        print "$file: unterminated comment\n"
                          unless defined($_);
                        if ($_ ne "\n") {
                                $first = $_;
                        } else {
                                $first = <SOURCE>;
                        }
                } else {
                        $first = $_;
                }
        } elsif ($type eq "TXT") {
                if ($_ =~ /[Cc]opyright/) {
                        $/ = "";            # paragraph at a time
                        while (<SOURCE>) {
                                # Not very maintainable, but ok enough for now.
                                last unless
                                  /[Cc]opyright/ ||
                                  /See COPYRIGHT in the source root/ ||
                                  /Permission to use, copy, modify, and / ||
                                  /THE SOFTWARE IS PROVIDED "AS IS" AND /;
                        }
                        $/ = "\n";
                }
                $first = $_;
        } else {
                $first = $_;
        }

        $first = "" if ! defined($first);

        open(TARGET, ">$file.new") || die "can't open $file.new: $!";
        print TARGET $before_copyright if $before_copyright;
        print TARGET $start_comment if $start_comment;

        $sysyears = "";
        $sftyears = "";
        $nomyears = "";

    #
    # Internet Software Consortium: up to 2003
    #
        $last_year = 0;
        $anchor_year = 0;
    $years = "";
        foreach $year (@years) {
        if ($year >= 2004) { next; }
                if ($last_year != 0 && $year == $last_year + 1) {
                        if ($year > $anchor_year + 1) {
                                substr($years, $anchor_end) = "-$year";
                        } else {
                                $years .= ", $year";
                        }
                } else {
                        $years .= $last_year == 0 ? "$year" : ", $year";
                        #if ($anchor_year != 0) {
                        #        print "$file: noncontiguous year: ",
                        #              "$year != $last_year + 1\n";
                        #}
                        $anchor_year = $year;
                        $anchor_end = length($years);
                }

                $last_year = $year;
        }
    $sftyears = $years;

    #
    # Nominum: up to 2001.
    #
        $last_year = 0;
        $anchor_year = 0;
    $years = "";
        foreach $year (@years) {
        if ($year >= 2002) { next; }
                if ($last_year != 0 && $year == $last_year + 1) {
                        if ($year > $anchor_year + 1) {
                                substr($years, $anchor_end) = "-$year";
                        } else {
                                $years .= ", $year";
                        }
                } else {
                        $years .= $last_year == 0 ? "$year" : ", $year";
                        #if ($anchor_year != 0) {
                        #        print "$file: noncontiguous year: ",
                        #              "$year != $last_year + 1\n";
                        #}
                        $anchor_year = $year;
                        $anchor_end = length($years);
                }

                $last_year = $year;
        }
    $nomyears = $years;

    #
    # Internet Systems Consortium: 2004 onwards.
    #
        $last_year = 0;
        $anchor_year = 0;
    $years = "";
    $anchor_end = length($years);
        foreach $year (@years) {
        if ($year < 2004) { next; }
                if ($last_year != 0 && $year == $last_year + 1) {
                        if ($year > $anchor_year + 1) {
                                substr($years, $anchor_end) = "-$year";
                        } else {
                                $years .= ", $year";
                        }
                } else {
                        $years .= $last_year == 0 ? "$year" : ", $year";
                        #if ($anchor_year != 0) {
                        #        print "$file: noncontiguous year: ",
                        #              "$year != $last_year + 1\n";
                        #}
                        $anchor_year = $year;
                        $anchor_end = length($years);
                }

                $last_year = $year;
        }
    $sysyears = $years;

        ($firstline, $secondline, $thirdline, @otherlines) = @$textp;

        $firstline =~ s/\@SYSYEARS\@/$sysyears/;
        $secondline =~ s/\@SFTYEARS\@/$sftyears/;
        $thirdline =~ s/\@NOMYEARS\@/$nomyears/;

        print TARGET "$prefix$firstline";
    if ($sftyears ne "" ) {
        print TARGET $secondline =~ /^$/ ? $nonspaceprefix : $prefix;
        print TARGET "$secondline";
    }
        print TARGET $thirdline =~ /^$/ ? $nonspaceprefix : $prefix;
    print TARGET "$thirdline";

        foreach $_ (@otherlines) {
                print TARGET (/^$/ ? $nonspaceprefix : $prefix);
                print TARGET "$_";
        }
        print TARGET $end_comment if $end_comment;

        if ($first eq "") {
                $first = <SOURCE>;
        }

        if (defined($first)) {
            if ($type eq 'MAN') {
                    print TARGET "$nonspaceprefix\n";
        } else {
                    print TARGET "\n";
                }

                undef $/;
                $_ = <SOURCE>;
                $/ = "\n";

        if ($type eq 'SGML' && m:<articleinfo>.*?</articleinfo>:s) {
            # print "docinfo: $file\n";
            my $r = copyrights(@years);
            s:<articleinfo>.*?</articleinfo>:<articleinfo>\n$r  </articleinfo>:s;
        }
        if ($type eq 'SGML' && m:<docinfo>.*?</docinfo>:s) {
            # print "docinfo: $file\n";
            my $r = copyrights(@years);
            s:<docinfo>.*?</docinfo>:<docinfo>\n$r  </docinfo>:s;
        }
        if ($type eq 'SGML' && m:<bookinfo>.*?</bookinfo>:s) {
            # print "bookinfo: $file\n";
            my $r = copyrights(@years);
            s:<bookinfo>.*?</bookinfo>:<bookinfo>\n$r  </bookinfo>:s;
        }

                my ($start, $end);
                if ($start_comment ne "") {
                        ($start = $start_comment) =~ s/\s*\n/ /;
                        ($end = $end_comment) =~ s/^\s*(.*)\n/ $1\n/;
                } elsif ($prefix ne "") {
                        ($start = $prefix) =~ s/\s*\n//;
                        $end = "\n";
                } else {
                        $start = "";
                        $end = "\n";
                }

                if ($first !~ /$keyword_pat/ && $_ !~ /$keyword_pat/) {
            $end = "\n$nonspaceprefix" if ($type eq "MAN");
                        print TARGET "$start\$";
                        print TARGET "Id";
                        print TARGET "\$$end\n";
                }

                print TARGET $first if $first !~ /^\s*$/;
                print TARGET $_;
        }
        close(TARGET);
        close(SOURCE);

        $mode = (stat $file)[2]&511;
        chmod $mode, "$file.new";

        if (system("cmp -s $file.new $file") == 0) {
                unlink("$file.new");
        } else {
                rename("$file.new", "$file")
                  or die "rename($file.new, $file): $!";
        }
}