ltlcross: report missing input/output sequence

* src/bin/ltlcross.cc: Fix it.
* src/tgbatest/ltlcross3.test: New file.
* src/tgbatest/Makefile.am: Add it.
* NEWS: Mention it.

NEWS

@@ -10,6 +10,8 @@ New in spot 1.2a (not released)
 
   * Bug fixes:
     - ltlcross' CSV output now stricly follows RFC 4180.
+    - ltlcross failed to report missing input or output escape sequences
+      on all but the first configured translator.
 
 New in spot 1.2 (2013-10-01)
 

src/bin/ltlcross.cc

@@ -690,14 +690,13 @@ namespace
       declare('N', &output);
       declare('T', &output);
 
-      std::vector<bool> has(256);
       size_t s = translators.size();
       assert(s);
       for (size_t n = 0; n < s; ++n)
 	{
 	  // Check that each translator uses at least one input and
 	  // one output.
-	  has.clear();
+	  std::vector<bool> has(256);
 	  const translator_spec& t = translators[n];
 	  scan(t.cmd, has);
 	  if (!(has['f'] || has['s'] || has['l'] || has['w']

src/tgbatest/Makefile.am

@@ -79,6 +79,7 @@ TESTS = \
   eltl2tgba.test \
   explicit.test \
   explicit2.test \
+  ltlcross3.test \
   taatgba.test \
   tgbaread.test \
   renault.test \

src/tgbatest/ltlcross3.test

@@ -0,0 +1,25 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2012, 2013 Laboratoire de Recherche et
+# Développement de l'Epita (LRDE).
+#
+# This file is part of Spot, a model checking library.
+#
+# Spot is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# Spot is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. ./defs
+set -e
+
+run 2 ../../bin/ltlcross 'ltl2tgba -s %f >%N' 'foo bar' 2>stderr -f a
+grep 'ltlcross.*no input.*in.*foo bar' stderr