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/* Copyright (C) 1999-2021 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, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libc-diag.h>
#define VAR "FOOBAR"
char putenv_val[100] = VAR "=some longer value";
static int
do_test (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;
}
/* This deliberately tests supplying a null pointer to a function whose
argument is marked __attribute__ ((nonnull)). */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT(5, "-Wnonnull");
errno = 0;
if (unsetenv (NULL) >= 0 || errno != EINVAL)
{
puts ("unsetenv #1 failed");
result = 1;
}
DIAG_POP_NEEDS_COMMENT;
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;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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