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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 : }