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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 |
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# under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# Koha is distributed in the hope that it will be useful, but |
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# WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# 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 |
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# along with Koha; if not, see <http://www.gnu.org/licenses>. |
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use strict; |
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use warnings; |
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require Exporter; |
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use C4::Context; |
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use CGI qw ( -utf8 ); |
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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 = 3.07.00.049; |
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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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&checkdigit |
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); |
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=item checkdigit |
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$valid = &checkdigit($cardnumber $nounique); |
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Takes a card number, computes its check digit, and compares it to the |
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checkdigit at the end of C<$cardnumber>. Returns a true value iff |
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C<$cardnumber> has a valid check digit. |
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=cut |
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#' |
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sub checkdigit ($;$) { |
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my ($infl, $nounique) = @_; |
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$infl = uc $infl; |
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# Check to make sure the cardnumber is unique |
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#FIXME: We should make the error for a nonunique cardnumber |
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#different from the one where the checkdigit on the number is |
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#not correct |
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unless ( $nounique ) |
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{ |
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my $query=qq{SELECT * FROM borrowers WHERE cardnumber=?}; |
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my $sth=C4::Context->prepare($query); |
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$sth->execute($infl); |
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my %results = $sth->fetchrow_hashref(); |
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if ( $sth->rows != 0 ) |
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{ |
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return 0; |
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} |
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} |
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if (C4::Context->preference("checkdigit") eq "none") { |
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return 1; |
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} |
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my @weightings = (8,4,6,3,5,2,1); |
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my $sum; |
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foreach my $i (1..7) { |
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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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} |
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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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if ($rem eq substr($infl,8,1)) { |
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return 1; |
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} |
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return 0; |
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} # sub checkdigit |
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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 Development Team <http://koha-community.org/> |
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=cut |