randltl: first stage of the reimplementation

* src/bin/common_range.cc, src/bin/common_range.hh: New files,
extracted from...
* src/bin/genltl.cc: ... here.
* src/bin/randltl.cc, src/bin/man/randltl.x: New files.
* src/bin/Makefile.am, src/bin/man/Makefile.am: Adjust.
* src/bin/man/genltl.x: Point to randltl(1).

src/bin/common_range.cc

@@ -0,0 +1,75 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2012 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 2 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 Spot; see the file COPYING.  If not, write to the Free
+// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "error.h"
+
+#include "common_range.hh"
+#include <iostream>
+#include <cstdlib>
+
+range
+parse_range(const char* str)
+{
+  range res;
+
+  // The range should have the form INT..INT or INT:INT, with
+  // "42" standing for "42..42", and "..42" meaning "1..42".
+  char* end;
+  res.min = strtol(str, &end, 10);
+  if (end == str)
+    {
+      // No leading number.  It's OK as long as the string is not
+      // empty.
+      if (!*end)
+	error(1, 0, "invalid empty range");
+      res.min = 1;
+    }
+  if (!*end)
+    {
+      // Only one number.
+      res.max = res.min;
+    }
+  else
+    {
+      // Skip : or ..
+      if (end[0] == ':')
+	++end;
+      else if (end[0] == '.' && end[1] == '.')
+	end += 2;
+
+      // Parse the next integer.
+      char* end2;
+      res.max = strtol(end, &end2, 10);
+      if (end == end2)
+	error(1, 0, "invalid range '%s' (missing end?)", str);
+      if (*end2)
+	error(1, 0, "invalid range '%s' (trailing garbage?)", str);
+    }
+
+  if (res.min < 0 || res.max < 0)
+    error(1, 0, "invalid range '%s': values must be positive", str);
+
+  return res;
+}