imap: support out-of-bounds ranges

"$UID_START:*" needs to return at least one message according
to RFC 3501 section 6.4.8.

While we're in the area, coerce ranges to (unsigned) integers by
adding zero ("+ 0") to reduce memory overhead.

1 files changed, 13 insertions, 0 deletions

diff --git a/t/imapd.t b/t/imapd.t
index 3d0be340..2c4315de 100644
--- a/t/imapd.t
+++ b/t/imapd.t
@@ -116,6 +116,19 @@ $ret = $mic->search('uid 1:*') or BAIL_OUT "SEARCH FAIL $@";
 is_deeply($ret, [ 1 ], 'search UID 1:* works');
 
 is_deeply(scalar $mic->flags('1'), [], '->flags works');
+{
+        # RFC 3501 section 6.4.8 states:
+        # Also note that a UID range of 559:* always includes the
+        # UID of the last message in the mailbox, even if 559 is
+        # higher than any assigned UID value.
+        my $exp = $mic->fetch_hash(1, 'UID');
+        $ret = $mic->fetch_hash('559:*', 'UID');
+        is_deeply($ret, $exp, 'beginning range too big');
+        for my $r (qw(559:558 558:559)) {
+                $ret = $mic->fetch_hash($r, 'UID');
+                is_deeply($ret, {}, "out-of-range UID FETCH $r");
+        }
+}
 
 for my $r ('1:*', '1') {
         $ret = $mic->fetch_hash($r, 'RFC822') or BAIL_OUT "FETCH $@";