93 lines
2 KiB
Perl
93 lines
2 KiB
Perl
package C4::Input; #assumes C4/Input
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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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@ISA = qw(Exporter);
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@EXPORT = qw(
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&checkflds &checkdigit &checkvalidisbn
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);
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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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$i++
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}
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return (\@probarr);
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}
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sub checkdigit {
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my ($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 $infl."<br>";
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while ($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 = $sum + ($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 $valid;
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} # sub checkdigit
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#--------------------------------------
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# Determine if a number is a valid ISBN number, according to length
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# of 10 digits and valid checksum
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sub checkvalidisbn {
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use strict;
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my ($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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$c=int(11-($c/11-int($c/11))*11+.1);
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($c==10) && ($c='X');
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if ($c eq $checksum) {
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$isbngood=1;
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} else {
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$isbngood=0;
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}
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} else {
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$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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