Rudder » Techniques

package DBM_Filter::null ;

use strict;

use warnings;

our $VERSION = '0.02';

sub Store

{

    no warnings 'uninitialized';

    $_ .= "\x00" ;

}

sub Fetch

{

    no warnings 'uninitialized';

    s/\x00$// ;

}

1;

__END__

=head1 NAME

DBM_Filter::null - filter for DBM_Filter

=head1 SYNOPSIS

    use SDBM_File; # or DB_File, or GDBM_File, or NDBM_File, or ODBM_File

    use DBM_Filter ;

    $db = tie %hash, ...

    $db->Filter_Push('null');

=head1 DESCRIPTION

This filter ensures that all data written to the DBM file is null

terminated. This is useful when you have a perl script that needs

to interoperate with a DBM file that a C program also uses. A fairly

common issue is for the C application to include the terminating null

in a string when it writes to the DBM file. This filter will ensure that

all data written to the DBM file can be read by the C application.

=head1 SEE ALSO

L<DBM_Filter>, L<perldbmfilter>

=head1 AUTHOR

Paul Marquess pmqs@cpan.org