Add a missing source file.

* src/ecpp-check.c: New file.
* .gitignore: Add new binary.

.gitignore

@@ -21,6 +21,7 @@ src/classpol
 src/cm
 src/ecpp
 src/ecpp-mpi
+src/ecpp-check
 
 aclocal.m4
 autom4te.cache/

src/ecpp-check.c

+/*
+
+ecpp-check.c - executable for verifying ECPP certificates
+
+Copyright (C) 2024 Andreas Enge
+
+This file is part of CM.
+
+CM 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.
+
+CM 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 CM; see the file COPYING. If not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+#include "params.h"
+
+int main (int argc, char* argv [])
+{
+   char *filename;
+   int res, res_pari;
+
+   cm_pari_init ();
+
+   evaluate_parameters_ecpp_check (argc, argv, &filename);
+
+   res = cm_pari_ecpp_file_check (filename, true, true);
+
+   if (res == 1)
+      printf ("The file contains a valid ECPP certificate "
+         "in the CM format.\n");
+   else if (res == 2)
+      printf ("The file contains a valid partial ECPP certificate "
+         "in the CM format.\n");
+   else {
+      res_pari = cm_pari_ecpp_file_check (filename, false, true);
+      printf ("The certificate in the file is invalid according to the "
+         "CM specification.\n");
+      if (res_pari == 1)
+         printf ("But it is valid ");
+      else if (res_pari == 2)
+         printf ("But it is a valid partial certificate ");
+      else
+         printf ("It is also invalid ");
+      printf ("according to the PARI/GP specification.\n");
+   }
+
+   cm_pari_clear ();
+
+   return 0;
+}