-# here's a file-private function as a closure,
-# callable as &$priv_func; it cannot be prototyped.
-my $priv_func = sub {
-# stuff goes here.
- };
-
-# make all your functions, whether exported or not;
-
-sub checkflds {
- my ($env,$reqflds,$data) = @_;
- my $numrflds = @$reqflds;
- my @probarr;
- my $i = 0;
- while ($i < $numrflds) {
- if ($data->{@$reqflds[$i]} eq "") {
- push(@probarr, @$reqflds[$i]);
- }
- $i++
- }
- return (\@probarr);
-}
+ my ($env,$infl, $nounique) = @_;
+ $infl = uc $infl;
+
+
+ #Check to make sure the cardnumber is unique
+
+ #FIXME: We should make the error for a nonunique cardnumber
+ #different from the one where the checkdigit on the number is
+ #not correct
+
+ unless ( $nounique )
+ {
+ my $dbh=C4::Context->dbh;
+ my $query=qq{SELECT * FROM borrowers WHERE cardnumber=?};
+ my $sth=$dbh->prepare($query);
+ $sth->execute($infl);
+ my %results = $sth->fetchrow_hashref();
+ if ( $sth->rows != 0 )
+ {
+ return 0;
+ }
+ }
+ if (C4::Context->preference("checkdigit") eq "none") {
+ return 1;
+ }
+
+ my @weightings = (8,4,6,3,5,2,1);
+ my $sum;
+ my $i = 1;
+ my $valid = 0;
+
+ foreach $i (1..7) {
+ my $temp1 = $weightings[$i-1];
+ my $temp2 = substr($infl,$i,1);
+ $sum += $temp1 * $temp2;
+ }
+ my $rem = ($sum%11);
+ if ($rem == 10) {
+ $rem = "X";
+ }
+ if ($rem eq substr($infl,8,1)) {
+ $valid = 1;
+ }
+ return $valid;
+} # sub checkdigit
+
+=item checkvalidisbn
+
+ $valid = &checkvalidisbn($isbn);
+
+Returns a true value iff C<$isbn> is a valid ISBN: it must be ten
+digits long (counting "X" as a digit), and must have a valid check
+digit at the end.
+
+=cut
+#'
+#--------------------------------------
+# Determine if a number is a valid ISBN number, according to length
+# of 10 digits and valid checksum
+sub checkvalidisbn {
+ use strict;
+ my ($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;
+
+ #return 0 if $q is not ten digits long
+ if (length($q)!=10) {
+ return 0;
+ }
+
+ #If we get to here, length($q) must be 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);
+ }
+ $c %= 11;
+ ($c==10) && ($c='X');
+ $isbngood = $c eq $checksum;
+
+ return $isbngood;
+
+} # sub checkvalidisbn