bin: factor common conversion functions

* src/bin/common_conv.cc, src/bin/common_conv.hh: New files.
* src/bin/Makefile.am: Add them.
* src/bin/autfilt.cc, src/bin/ltlcross.cc, src/bin/ltlfilt.cc,
src/bin/ltlgrind.cc, src/bin/randaut.cc, src/bin/randltl.cc: Use them.

src/bin/common_conv.cc

@@ -0,0 +1,82 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2015 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/>.
+
+#include "common_conv.hh"
+#include <cstdlib>
+#include "error.h"
+#include "hoaparse/public.hh"
+
+int
+to_int(const char* s)
+{
+  char* endptr;
+  int res = strtol(s, &endptr, 10);
+  if (*endptr)
+    error(2, 0, "failed to parse '%s' as an integer.", s);
+  return res;
+}
+
+int
+to_pos_int(const char* s)
+{
+  int res = to_int(s);
+  if (res < 0)
+    error(2, 0, "%d is not positive", res);
+  return res;
+}
+
+unsigned
+to_unsigned (const char *s)
+{
+  char* endptr;
+  unsigned res = strtoul(s, &endptr, 10);
+  if (*endptr)
+    error(2, 0, "failed to parse '%s' as an unsigned integer.", s);
+  return res;
+}
+
+float
+to_float(const char* s)
+{
+  char* endptr;
+  float res = strtof(s, &endptr);
+  if (*endptr)
+    error(2, 0, "failed to parse '%s' as a float.", s);
+  return res;
+}
+
+float
+to_probability(const char* s)
+{
+  float res = to_float(s);
+  if (res < 0.0 || res > 1.0)
+    error(2, 0, "%f is not between 0 and 1.", res);
+  return res;
+}
+
+spot::tgba_digraph_ptr
+read_automaton(const char* filename, spot::bdd_dict_ptr& dict)
+{
+  spot::hoa_parse_error_list pel;
+  auto p = spot::hoa_parse(filename, pel, dict);
+  if (spot::format_hoa_parse_errors(std::cerr, filename, pel)
+      || !p || p->aborted)
+    error(2, 0, "failed to read automaton from %s", filename);
+  return std::move(p->aut);
+}