173 lines
3.9 KiB
Perl
173 lines
3.9 KiB
Perl
package C4::Input; #assumes C4/Input
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# Copyright 2000-2002 Katipo Communications
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#
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it under the
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# terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along with
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# Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
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# Suite 330, Boston, MA 02111-1307 USA
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use strict;
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require Exporter;
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use vars qw($VERSION @ISA @EXPORT);
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# set the version for version checking
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$VERSION = 0.01;
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=head1 NAME
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C4::Input - Miscellaneous sanity checks
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=head1 SYNOPSIS
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use C4::Input;
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=head1 DESCRIPTION
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This module provides functions to see whether a given library card
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number or ISBN is valid.
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=head1 FUNCTIONS
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=over 2
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=cut
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@ISA = qw(Exporter);
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@EXPORT = qw(
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&checkflds &checkdigit &checkvalidisbn
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);
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# FIXME - This is never used.
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sub checkflds {
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my ($env,$reqflds,$data) = @_;
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my $numrflds = @$reqflds;
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my @probarr;
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my $i = 0;
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while ($i < $numrflds) {
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if ($data->{@$reqflds[$i]} eq "") {
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push(@probarr, @$reqflds[$i]);
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}
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$i++
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}
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return (\@probarr);
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}
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=item checkdigit
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$valid = &checkdigit($env, $cardnumber);
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Takes a card number, computes its check digit, and compares it to the
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checkdigit at the end of C<$cardnumber>. Returns a true value iff
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C<$cardnumber> has a valid check digit.
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C<$env> is ignored.
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=cut
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#'
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sub checkdigit {
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my ($env,$infl) = @_;
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$infl = uc $infl;
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my @weightings = (8,4,6,3,5,2,1);
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my $sum;
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my $i = 1;
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my $valid = 0;
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# print $infl."<br>";
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# FIXME - for ($i = 1; $i < 8; $i++)
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# or foreach $i (1..7)
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while ($i <8) {
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my $temp1 = $weightings[$i-1];
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my $temp2 = substr($infl,$i,1);
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$sum += $temp1 * $temp2;
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# print "$sum $temp1 $temp2<br>";
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$i++;
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}
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my $rem = ($sum%11);
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if ($rem == 10) {
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$rem = "X";
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}
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#print $rem."<br>";
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if ($rem eq substr($infl,8,1)) {
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$valid = 1;
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}
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return $valid;
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} # sub checkdigit
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=item checkvalidisbn
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$valid = &checkvalidisbn($isbn);
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Returns a true value iff C<$isbn> is a valid ISBN: it must be ten
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digits long (counting "X" as a digit), and must have a valid check
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digit at the end.
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=cut
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#'
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#--------------------------------------
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# Determine if a number is a valid ISBN number, according to length
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# of 10 digits and valid checksum
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sub checkvalidisbn {
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use strict;
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my ($q)=@_ ; # Input: ISBN number
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my $isbngood = 0; # Return: true or false
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$q=~s/x$/X/g; # upshift lower case X
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$q=~s/[^X\d]//g;
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$q=~s/X.//g;
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if (length($q)==10) {
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my $checksum=substr($q,9,1);
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my $isbn=substr($q,0,9);
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my $i;
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my $c=0;
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for ($i=0; $i<9; $i++) {
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my $digit=substr($q,$i,1);
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$c+=$digit*(10-$i);
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}
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$c=$c%11; # % is the modulus function
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($c==10) && ($c='X');
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# FIXME - $isbngood = $c eq $checksum;
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if ($c eq $checksum) {
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$isbngood=1;
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} else {
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$isbngood=0;
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}
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} else {
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# FIXME - Put "return 0 if $length($q) != 10" near the
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# top, so we don't have to indent the rest of the function
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# as much.
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$isbngood=0;
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} # if length good
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return $isbngood;
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} # sub checkvalidisbn
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END { } # module clean-up code here (global destructor)
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1;
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__END__
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=back
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=head1 AUTHOR
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Koha Developement team <info@koha.org>
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=head1 SEE ALSO
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L<perl>.
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=cut
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