1 package C4::Input; #assumes C4/Input
4 # Copyright 2000-2002 Katipo Communications
6 # This file is part of Koha.
8 # Koha is free software; you can redistribute it and/or modify it under the
9 # terms of the GNU General Public License as published by the Free Software
10 # Foundation; either version 2 of the License, or (at your option) any later
13 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
14 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
15 # A PARTICULAR PURPOSE. See the GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License along with
18 # Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
19 # Suite 330, Boston, MA 02111-1307 USA
25 use vars qw($VERSION @ISA @EXPORT);
27 # set the version for version checking
32 C4::Input - Miscellaneous sanity checks
40 This module provides functions to see whether a given library card
41 number or ISBN is valid.
51 &checkdigit &checkvalidisbn
54 # FIXME - This is never used.
56 # my ($env,$reqflds,$data) = @_;
57 # my $numrflds = @$reqflds;
60 # while ($i < $numrflds) {
61 # if ($data->{@$reqflds[$i]} eq "") {
62 # push(@probarr, @$reqflds[$i]);
71 $valid = &checkdigit($env, $cardnumber);
73 Takes a card number, computes its check digit, and compares it to the
74 checkdigit at the end of C<$cardnumber>. Returns a true value iff
75 C<$cardnumber> has a valid check digit.
82 if (C4::Context->preference("checkdigit") eq "none") {
87 my @weightings = (8,4,6,3,5,2,1);
93 my $temp1 = $weightings[$i-1];
94 my $temp2 = substr($infl,$i,1);
95 $sum += $temp1 * $temp2;
101 if ($rem eq substr($infl,8,1)) {
110 $valid = &checkvalidisbn($isbn);
112 Returns a true value iff C<$isbn> is a valid ISBN: it must be ten
113 digits long (counting "X" as a digit), and must have a valid check
118 #--------------------------------------
119 # Determine if a number is a valid ISBN number, according to length
120 # of 10 digits and valid checksum
123 my ($q)=@_ ; # Input: ISBN number
125 my $isbngood = 0; # Return: true or false
127 $q=~s/x$/X/g; # upshift lower case X
131 #return 0 if $q is not ten digits long
132 if (length($q)!=10) {
136 #If we get to here, length($q) must be 10
137 my $checksum=substr($q,9,1);
138 my $isbn=substr($q,0,9);
141 for ($i=0; $i<9; $i++) {
142 my $digit=substr($q,$i,1);
146 ($c==10) && ($c='X');
147 $isbngood = $c eq $checksum;
151 } # sub checkvalidisbn
153 END { } # module clean-up code here (global destructor)
162 Koha Developement team <info@koha.org>