Line data    Source code

       1             : /* Test of environ variable.
       2             :    Copyright (C) 2008-2020 Free Software Foundation, Inc.
       3             : 
       4             :    This program is free software: you can redistribute it and/or modify
       5             :    it under the terms of the GNU General Public License as published by
       6             :    the Free Software Foundation; either version 3 of the License, or
       7             :    (at your option) any later version.
       8             : 
       9             :    This program is distributed in the hope that it will be useful,
      10             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12             :    GNU General Public License for more details.
      13             : 
      14             :    You should have received a copy of the GNU General Public License
      15             :    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16             : 
      17             : /* Written by Bruno Haible <bruno@clisp.org>, 2008.  */
      18             : 
      19             : #include <config.h>
      20             : 
      21             : #include <unistd.h>
      22             : 
      23             : #include <string.h>
      24             : 
      25             : int
      26           1 : main ()
      27             : {
      28             :   /* The environment variables that are set even in the weirdest situations
      29             :      are HOME and PATH.
      30             :      POSIX says that HOME is initialized by the system, and that PATH may be
      31             :      unset.  But in practice it's more frequent to see HOME unset and PATH
      32             :      set.  So we test the presence of PATH.  */
      33           1 :   char **remaining_variables = environ;
      34             :   char *string;
      35             : 
      36          66 :   for (; (string = *remaining_variables) != NULL; remaining_variables++)
      37             :     {
      38          66 :       if (strncmp (string, "PATH=", 5) == 0)
      39             :         /* Found the PATH environment variable.  */
      40           1 :         return 0;
      41             :     }
      42             :   /* Failed to find the PATH environment variable.  */
      43           0 :   return 1;
      44             : }