/* Test of environ variable.

   Copyright (C) 2008-2020 Free Software Foundation, Inc.

   This program 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.

   This program 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 <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2008.  */

#include <config.h>

#include <unistd.h>

#include <string.h>

int

main ()

{

  /* The environment variables that are set even in the weirdest situations

     are HOME and PATH.

     POSIX says that HOME is initialized by the system, and that PATH may be

     unset.  But in practice it's more frequent to see HOME unset and PATH

     set.  So we test the presence of PATH.  */

  char **remaining_variables = environ;

  char *string;

  for (; (string = *remaining_variables) != NULL; remaining_variables++)

    {

      if (strncmp (string, "PATH=", 5) == 0)

        /* Found the PATH environment variable.  */

        return 0;

    }

  /* Failed to find the PATH environment variable.  */

  return 1;

}