+ my ($a, $b) = @_;
+ return undef unless $a < $b;
+ $b--;
+ my $d = $b - $a;
+ my @a = split //, $a;
+ my @b = split //, $b;
+ my $out;
+ while (@b > @a) {
+ $out .= shift @b;
+ }
+ while (@b) {
+ my $aa = shift @a;
+ my $bb = shift @b;
+ if (@b < (length $d)) {
+ $out .= '\\d';
+ } elsif ($aa eq $bb) {
+ $out .= $aa;
+ } elsif ($aa < $bb) {
+ $out .= "[$aa-$bb]";
+ } else {
+ $out .= "[0-$bb$aa-9]";
+ }
+ }
+ return $out;
+}
+
+# format a spot for user output in list mode
+sub formatl
+{
+ my $t = ztime($_[2]);
+ my $d = cldate($_[2]);
+ return sprintf "%8.1f %-11s %s %s %-28.28s%7s>", $_[0], $_[1], $d, $t, $_[3], "<$_[4]" ;
+}
+
+#
+# return all the spots from a day's file as an array of references
+# the parameter passed is a julian day
+sub readfile($)
+{
+ my @spots;
+
+ my $fh = $fp->open(shift);
+ if ($fh) {
+ my $in;
+ while (<$fh>) {
+ chomp;
+ push @spots, [ split '\^' ];
+ }
+ }
+ return @spots;
+}
+
+# enter the spot for dup checking and return true if it is already a dup
+sub dup
+{
+ my ($freq, $call, $d, $text, $by) = @_;
+
+ # dump if too old
+ return 2 if $d < $main::systime - $dupage;
+
+ # turn the time into minutes (should be already but...)
+ $d = int ($d / 60);
+ $d *= 60;
+
+ $freq = sprintf "%.1f", $freq; # normalise frequency
+ $call = substr($call, 0, $maxcalllth) if length $call > $maxcalllth;
+
+ chomp $text;
+ $text =~ s/\%([0-9A-F][0-9A-F])/chr(hex($1))/eg;
+ $text = unpad($text);
+ $text = substr($text, 0, $duplth) if length $text > $duplth;
+ $text = pack("C*", map {$_ & 127} unpack("C*", $text));
+ $text =~ s/[^a-zA-Z0-9]//g;
+ my $ldupkey = "X$freq|$call|$by" . uc $text;
+ my $t = DXDupe::find($ldupkey);
+ return 1 if $t && $t - $main::systime > 0;
+ DXDupe::add($ldupkey, $main::systime+$dupage);
+# my $sdupkey = "X$freq|$call|$by";
+# $t = DXDupe::find($sdupkey);
+# return 1 if $t && $t - $main::systime > 0;
+# DXDupe::add($sdupkey, $main::systime+$dupage);
+ return 0;