#!/usr/local/bin/perl

#   Copyright(C)1999,2001 by Daniel B. Sedory
#
#    This PROGRAM creates a list of Standard IP Addresses (NO leading
#  zeros) from a list of "Formatted IP Numbers" by REMOVING any leading
#  zeros in memory before writing the new file. It reverses the process
#  of the program "ip2ipf.pl"    For example:
#
#    001.023.004.056   will be listed as   1.23.4.56   
#
#  [ SEE comments in the companion Perl program ip2ipf.pl ]
#
#        The OUTPUT FILE will be named:   ip.txt
#           ( INPUT file will NOT be changed )


print "\n   This program makes NO changes to the INPUT file. The INPUT\n";
print " file must contain only a listing of IP Numbers (one per line!)\n";
print " It REMOVES leading ZEROs from IPs such as  001.023.004.056  by\n";
print " saving the Standard IP format (1.23.4.56) to an OUTPUT file\n";
print " called:   ip.txt\n\n";
print " What is the file you wish to read? "; 


$inpfilename = <STDIN>;
chop($inpfilename);

open (FILE, "$inpfilename") || die("Could not open the file $inpfilename");
@lines = <FILE>;
close(FILE);

open(PIP, ">ip.txt");

foreach $line (@lines)		   # Examine one line at a time.
   {
     @words = split(/\./, $line);  # Split line into an array of 4 words
				   # using the "dots" as separators.

     $words[3] =~ s/\n//;	   # Remove "newline char" from last.
     foreach $word (@words)
        {			   # REMOVE any leading zeros ...
          $word =~ s/^00//;
	  $word =~ s/^0//;
            if ($word eq "") {$word = "0";}  # Make sure we don't remove
                                             # a zero that's part of the
                                             # IP Number itself.
        }
        			   # Put the line back together again
                                   # using the JOIN function:

     $line = join (".", @words);

     #  In the past we had a more complicated method here using a "."
     #  between each element of @words and the decimal point (.)  to
     #  concatenate the string together! 

                                          
     print PIP "$line\n";    # Write the new line and get another one...
   }

close(PIP);

exit;

#   Copyright(C)1999,2001 by Daniel B. Sedory