(main): Handle command "b", for testing backwards iterators. ("r",

	"R", and "I" were all taken).

src/server/testsuite/test-l2g.c

@@ -60,6 +60,7 @@
   w m     write
   i m     iterate through all texts
   i m f e iterate through f..e-1
+  b m f e reverse iterate through f..e-1
   q       quit
  */
 int
@@ -234,6 +235,34 @@ main(void)
 		ok = 1;
 	    }
 	    break;
+	case 'b':
+	    if (n == 1 && num[0] < MAXMAPS)
+	    {
+		/* This is not yet implemented by local-to-global.c. */
+#if 0
+		L2g_reverse_iterator iter;
+		for (l2gi_searchall_reverse(&iter, &maps[num[0]]);
+		     !iter.search_ended;
+		     l2gi_prev(&iter))
+		    printf("%lu:%lu\n",
+			   (unsigned long)iter.lno,
+			   (unsigned long)iter.tno);
+		ok = 1;
+#endif
+	    }
+	    else if (n == 3 && num[0] < MAXMAPS)
+	    {
+		L2g_reverse_iterator iter;
+		for (l2gi_searchsome_reverse(&iter, &maps[num[0]],
+					     num[1], num[2]);
+		     !iter.search_ended;
+		     l2gi_prev(&iter))
+		    printf("%lu:%lu\n",
+			   (unsigned long)iter.lno,
+			   (unsigned long)iter.tno);
+		ok = 1;
+	    }
+	    break;
 	case 'u':
 	    if (n == 1 && num[0] < MAXMAPS)
 	    {