/* Copyright (C) 1999, 2004 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #define VAR "FOOBAR" char putenv_val[100] = VAR "=some longer value"; int main (void) { int result = 0; const char *valp; /* First test: remove entry FOOBAR, whether it exists or not. */ unsetenv (VAR); /* Now getting the value should fail. */ if (getenv (VAR) != NULL) { printf ("There should be no `%s' value\n", VAR); result = 1; } /* Now add a value, with the replace flag cleared. */ if (setenv (VAR, "one", 0) != 0) { printf ("setenv #1 failed: %m\n"); result = 1; } /* Getting this value should now be possible. */ valp = getenv (VAR); if (valp == NULL || strcmp (valp, "one") != 0) { puts ("getenv #2 failed"); result = 1; } /* Try to replace without the replace flag set. This should fail. */ if (setenv (VAR, "two", 0) != 0) { printf ("setenv #2 failed: %m\n"); result = 1; } /* The value shouldn't have changed. */ valp = getenv (VAR); if (valp == NULL || strcmp (valp, "one") != 0) { puts ("getenv #3 failed"); result = 1; } /* Now replace the value using putenv. */ if (putenv (putenv_val) != 0) { printf ("putenv #1 failed: %m\n"); result = 1; } /* The value should have changed now. */ valp = getenv (VAR); if (valp == NULL || strcmp (valp, "some longer value") != 0) { printf ("getenv #4 failed (is \"%s\")\n", valp); result = 1; } /* Now one tricky check: changing the variable passed in putenv should change the environment. */ strcpy (&putenv_val[sizeof VAR], "a short one"); /* The value should have changed again. */ valp = getenv (VAR); if (valp == NULL || strcmp (valp, "a short one") != 0) { puts ("getenv #5 failed"); result = 1; } /* It should even be possible to rename the variable. */ strcpy (putenv_val, "XYZZY=some other value"); /* Now a lookup using the old name should fail. */ if (getenv (VAR) != NULL) { puts ("getenv #6 failed"); result = 1; } /* But using the new name it should work. */ valp = getenv ("XYZZY"); if (valp == NULL || strcmp (valp, "some other value") != 0) { puts ("getenv #7 failed"); result = 1; } /* Create a new variable with the old name. */ if (setenv (VAR, "a new value", 0) != 0) { printf ("setenv #3 failed: %m\n"); result = 1; } /* At this point a getenv call must return the new value. */ valp = getenv (VAR); if (valp == NULL || strcmp (valp, "a new value") != 0) { puts ("getenv #8 failed"); result = 1; } /* Black magic: rename the variable we added using putenv back. */ strcpy (putenv_val, VAR "=old name new value"); /* This is interesting. We have two variables with the same name. Getting a value should return one of them. */ valp = getenv (VAR); if (valp == NULL || (strcmp (valp, "a new value") != 0 && strcmp (valp, "old name new value") != 0)) { puts ("getenv #9 failed"); result = 1; } /* More fun ahead: we are now removing the variable. This should remove both values. The cast is ok: this call should never put the string in the environment and it should never modify it. */ putenv ((char *) VAR); /* Getting the value should now fail. */ if (getenv (VAR) != NULL) { printf ("getenv #10 failed (\"%s\" found)\n", getenv (VAR)); result = 1; } /* Now a test with an environment variable that's one character long. This is to test a special case in the getenv implementation. */ strcpy (putenv_val, "X=one character test"); if (putenv (putenv_val) != 0) { printf ("putenv #2 failed: %m\n"); result = 1; } valp = getenv ("X"); if (valp == NULL || strcmp (valp, "one character test") != 0) { puts ("getenv #11 failed"); result = 1; } /* Both setenv and unsetenv should return -1/EINVAL for NULL or "" name or if name contains '=' character. */ errno = 0; if (setenv (NULL, "val", 1) >= 0 || errno != EINVAL) { puts ("setenv #4 failed"); result = 1; } errno = 0; if (setenv ("", "val", 0) >= 0 || errno != EINVAL) { puts ("setenv #5 failed"); result = 1; } errno = 0; if (setenv ("var=val", "val", 1) >= 0 || errno != EINVAL) { puts ("setenv #6 failed"); result = 1; } errno = 0; if (unsetenv (NULL) >= 0 || errno != EINVAL) { puts ("unsetenv #1 failed"); result = 1; } errno = 0; if (unsetenv ("") >= 0 || errno != EINVAL) { puts ("unsetenv #2 failed"); result = 1; } errno = 0; if (unsetenv ("x=y") >= 0 || errno != EINVAL) { puts ("unsetenv #3 failed"); result = 1; } return result; }