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#include <stdio.h>
#include <stdlib.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. */
putenv (VAR);
/* Getting the value should now fail. */
if (getenv (VAR) != NULL)
{
printf ("getenv #10 failed (\"%s\" found)\n", getenv (VAR));
result = 1;
}
return result;
}
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