+ return ($gotkey, map { $prefix_loc{$_} } split ',', $ref);
+}
+
+#
+# put the key LRU incluing the city state info
+#
+
+sub lru_put
+{
+ my ($call, $ref) = @_;
+ my @s = USDB::get($call);
+
+ if (@s) {
+ # this is deep magic, because this is a reference to static data, it
+ # must be copied.
+ my $h = { %{$ref->[1]} };
+ bless $h, ref $ref->[1];
+ $h->{city} = $s[0];
+ $h->{state} = $s[1];
+ $ref->[1] = $h;
+ } else {
+ $ref->[1]->{city} = $ref->[1]->{state} = "" unless exists $ref->[1]->{state};
+ }
+
+ dbg("Prefix::lru_put $call -> ($ref->[1]->{city}, $ref->[1]->{state})") if isdbg('prefix');
+ $lru->put($call, $ref);
+}
+
+#
+# search for the nearest match of a prefix string (starting
+# from the RH end of the string passed)
+#
+
+sub matchprefix
+{
+ my $pref = shift;
+ my @partials;
+
+ for (my $i = length $pref; $i; $i--) {
+ $matchtotal++;
+ my $s = substr($pref, 0, $i);
+ push @partials, $s;
+ my $p = $lru->get($s);
+ if ($p) {
+ $hits++;
+ if (isdbg('prefix')) {
+ my $percent = sprintf "%.1f", $hits * 100 / $misses;
+ dbg("Partial Prefix Cache Hit: $s Hits: $hits/$misses of $matchtotal = $percent\%");
+ }
+ lru_put($_, $p) for @partials;
+ return @$p;
+ } else {
+ $misses++;
+ my @out = get($s);
+ if (isdbg('prefix')) {
+ my $part = $out[0] || "*";
+ $part .= '*' unless $part eq '*' || $part eq $s;
+ dbg("Partial prefix: $pref $s $part" );
+ }
+ if (@out && $out[0] eq $s) {
+ return @out;
+ }
+ }
+ }
+ return ();