| /* 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; |
| } |