93 lines
2 KiB
Perl
93 lines
2 KiB
Perl
package C4::Input; #assumes C4/Input
|
|
|
|
use strict;
|
|
require Exporter;
|
|
|
|
use vars qw($VERSION @ISA @EXPORT);
|
|
|
|
# set the version for version checking
|
|
$VERSION = 0.01;
|
|
|
|
@ISA = qw(Exporter);
|
|
@EXPORT = qw(
|
|
&checkflds &checkdigit &checkvalidisbn
|
|
);
|
|
|
|
sub checkflds {
|
|
my ($env,$reqflds,$data) = @_;
|
|
my $numrflds = @$reqflds;
|
|
my @probarr;
|
|
my $i = 0;
|
|
while ($i < $numrflds) {
|
|
if ($data->{@$reqflds[$i]} eq "") {
|
|
push(@probarr, @$reqflds[$i]);
|
|
}
|
|
$i++
|
|
}
|
|
return (\@probarr);
|
|
}
|
|
|
|
sub checkdigit {
|
|
my ($env,$infl) = @_;
|
|
$infl = uc $infl;
|
|
my @weightings = (8,4,6,3,5,2,1);
|
|
my $sum;
|
|
my $i = 1;
|
|
my $valid = 0;
|
|
# print $infl."<br>";
|
|
while ($i <8) {
|
|
my $temp1 = $weightings[$i-1];
|
|
my $temp2 = substr($infl,$i,1);
|
|
$sum = $sum + ($temp1*$temp2);
|
|
# print "$sum $temp1 $temp2<br>";
|
|
$i++;
|
|
}
|
|
my $rem = ($sum%11);
|
|
if ($rem == 10) {
|
|
$rem = "X";
|
|
}
|
|
#print $rem."<br>";
|
|
if ($rem eq substr($infl,8,1)) {
|
|
$valid = 1;
|
|
}
|
|
return $valid;
|
|
} # sub checkdigit
|
|
|
|
#--------------------------------------
|
|
# Determine if a number is a valid ISBN number, according to length
|
|
# of 10 digits and valid checksum
|
|
sub checkvalidisbn {
|
|
use strict;
|
|
my ($q)=@_ ; # Input: ISBN number
|
|
|
|
my $isbngood = 0; # Return: true or false
|
|
|
|
$q=~s/x$/X/g; # upshift lower case X
|
|
$q=~s/[^X\d]//g;
|
|
$q=~s/X.//g;
|
|
if (length($q)==10) {
|
|
my $checksum=substr($q,9,1);
|
|
my $isbn=substr($q,0,9);
|
|
my $i;
|
|
my $c=0;
|
|
for ($i=0; $i<9; $i++) {
|
|
my $digit=substr($q,$i,1);
|
|
$c+=$digit*(10-$i);
|
|
}
|
|
$c=$c%11; # % is the modulus function
|
|
($c==10) && ($c='X');
|
|
if ($c eq $checksum) {
|
|
$isbngood=1;
|
|
} else {
|
|
$isbngood=0;
|
|
}
|
|
} else {
|
|
$isbngood=0;
|
|
} # if length good
|
|
|
|
return $isbngood;
|
|
|
|
} # sub checkvalidisbn
|
|
|
|
|
|
END { } # module clean-up code here (global destructor)
|