Tomcat example source code file (lineends.pl)

This example Tomcat source code file (lineends.pl) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

apache, argv, argv, if, if, io::file, io::file, license, license, m's, outch, see, some, you

The Tomcat lineends.pl source code

#!/usr/local/bin/perl

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

#
#  Heuristically converts line endings to the current OS's preferred format
#  
#  All existing line endings must be identical (e.g. lf's only, or even
#  the accedental cr.cr.lf sequence.)  If some lines end lf, and others as
#  cr.lf, the file is presumed binary.  If the cr character appears anywhere
#  except prefixed to an lf, the file is presumed binary.  If there is no 
#  change in the resulting file size, or the file is binary, the conversion 
#  is discarded.
#  
#  Todo: Handle NULL stdin characters gracefully.
#

use IO::File;
use File::Find;

# The ignore list is '-' seperated, with this leading hyphen and
# trailing hyphens in ever concatinated list below.
$ignore = "-";

# Image formats
$ignore .= "gif-jpg-jpeg-png-ico-bmp-";

# Archive formats
$ignore .= "tar-gz-z-zip-jar-war-bz2-tgz-";

# Many document formats
$ignore .= "eps-psd-pdf-ai-";

# Some encodings
$ignore .= "ucs2-ucs4-";

# Some binary objects
$ignore .= "class-so-dll-exe-obj-a-o-lo-slo-sl-dylib-";

# Some build env files
$ignore .= "mcp-xdc-ncb-opt-pdb-ilk-sbr-";

$preservedate = 1;

$forceending = 0;

$givenpaths = 0;

$notnative = 0;

while (defined @ARGV[0]) {
    if (@ARGV[0] eq '--touch') {
        $preservedate = 0;
    }
    elsif (@ARGV[0] eq '--nocr') {
        $notnative = -1;
    }
    elsif (@ARGV[0] eq '--cr') {
        $notnative = 1;
    }
    elsif (@ARGV[0] eq '--force') {
        $forceending = 1;
    }
    elsif (@ARGV[0] eq '--FORCE') {
        $forceending = 2;
    }
    elsif (@ARGV[0] =~ m/^-/) {
        die "What is " . @ARGV[0] . " supposed to mean?\n\n" 
	  . "Syntax:\t$0 [option()s] [path(s)]\n\n" . <<'OUTCH'
Where:	paths specifies the top level directory to convert (default of '.')
	options are;

	  --cr     keep/add one ^M
	  --nocr   remove ^M's
	  --touch  the datestamp (default: keeps date/attribs)
	  --force  mismatched corrections (unbalanced ^M's)
	  --FORCE  all files regardless of file name!

OUTCH
    }
    else {
        find(\&totxt, @ARGV[0]);
	print "scanned " . @ARGV[0] . "\n";
	$givenpaths = 1;
    }
    shift @ARGV;
}

if (!$givenpaths) {
    find(\&totxt, '.');
    print "did .\n";
}

sub totxt {
        $oname = $_;
	$tname = '.#' . $_;
        if (!-f) {
            return;
        }
	@exts = split /\./;
	if ($forceending < 2) {
            while ($#exts && ($ext = pop(@exts))) {
                if ($ignore =~ m|-$ext-|i) {
                    return;
                }
	    }
        }
	@ostat = stat($oname);
        $srcfl = new IO::File $oname, "r" or die;
	$dstfl = new IO::File $tname, "w" or die;
        binmode $srcfl; 
	if ($notnative) {
            binmode $dstfl;
	} 
	undef $t;
        while (<$srcfl>) { 
            if (s/(\r*)\n$/\n/) {
		$n = length $1;
		if (!defined $t) { 
		    $t = $n; 
		}
		if (!$forceending && (($n != $t) || m/\r/)) {
		    print "mismatch in " .$oname. ":" .$n. " expected " .$t. "\n";
		    undef $t;
		    last;
		}
	        elsif ($notnative > 0) {
                    s/\n$/\r\n/; 
                }
            }
	    print $dstfl $_; 
	}
	if (defined $t && (tell $srcfl == tell $dstfl)) {
	    undef $t;
	}
	undef $srcfl;
	undef $dstfl;
	if (defined $t) {
            unlink $oname or die;
            rename $tname, $oname or die;
            @anames = ($oname);
            if ($preservedate) {
                utime $ostat[9], $ostat[9], @anames;
            }
            chmod $ostat[2] & 07777, @anames;
            chown $ostat[5], $ostat[6], @anames;
            print "Converted file " . $oname . " to text in " . $File::Find::dir . "\n"; 
	}
	else {
	    unlink $tname or die;
	}
}