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       1                 :            : /* Test of environ variable.
       2                 :            :    Copyright (C) 2008-2013 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 <http://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         [ +  - ]:         32 :   for (; (string = *remaining_variables) != NULL; remaining_variables++)
      37                 :            :     {
      38         [ +  + ]:         32 :       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                 :          1 :   return 1;
      44                 :            : }