/*
* POSIX unsetenv()
*/
int unsetenv(const char *name) {
if (name == NULL || *name == '\0' || strchr(name, '=') != NULL) {
errno = EINVAL;
return -1;
}
_unsetenv(name);
return 0;
}
/* Put STRING, which is of the form "NAME=VALUE", in the environment.
If STRING contains no `=', then remove STRING from the environment. */
int
putenv (char *string)
{
const char *const name_end = strchr (string, '=');
register size_t size;
register char **ep;
if (name_end == NULL)
{
/* Remove the variable from the environment. */
return _unsetenv (string);
}
size = 0;
for (ep = environ; *ep != NULL; ++ep)
if (!strncmp (*ep, string, name_end - string) &&
(*ep)[name_end - string] == '=')
break;
else
++size;
if (*ep == NULL)
{
static char **last_environ = NULL;
char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
if (new_environ == NULL)
return -1;
(void) memcpy ((void *) new_environ, (void *) environ,
size * sizeof (char *));
new_environ[size] = (char *) string;
new_environ[size + 1] = NULL;
if (last_environ != NULL)
free (last_environ);
last_environ = new_environ;
environ = new_environ;
}
else
*ep = string;
return 0;
}
int unsetenv(const char *name) {
return _unsetenv(name);
// return _unsetenv(Utf8ToUtf16(name).c_str());
}
/* Put STRING, which is of the form "NAME=VALUE", in the environment.
If STRING contains no '=', then remove STRING from the environment. */
int
putenv (char *string)
{
const char *name_end = strchr (string, '=');
char **ep;
if (name_end == NULL)
{
/* Remove the variable from the environment. */
return _unsetenv (string);
}
#if HAVE_DECL__PUTENV
/* Rely on _putenv to allocate the new environment. If other
parts of the application use _putenv, the !HAVE_DECL__PUTENV code
would fight over who owns the environ vector, causing a crash. */
if (name_end[1])
return _putenv (string);
else
{
/* _putenv ("NAME=") unsets NAME, so invoke _putenv ("NAME= ")
to allocate the environ vector and then replace the new
entry with "NAME=". */
int putenv_result, putenv_errno;
char *name_x = malloc (name_end - string + sizeof "= ");
if (!name_x)
return -1;
memcpy (name_x, string, name_end - string + 1);
name_x[name_end - string + 1] = ' ';
name_x[name_end - string + 2] = 0;
putenv_result = _putenv (name_x);
putenv_errno = errno;
for (ep = environ; *ep; ep++)
if (strcmp (*ep, name_x) == 0)
{
*ep = string;
break;
}
# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
if (putenv_result == 0)
{
/* _putenv propagated "NAME= " into the subprocess environment;
fix that by calling SetEnvironmentVariable directly. */
name_x[name_end - string] = 0;
putenv_result = SetEnvironmentVariable (name_x, "") ? 0 : -1;
putenv_errno = ENOMEM; /* ENOMEM is the only way to fail. */
}
# endif
free (name_x);
__set_errno (putenv_errno);
return putenv_result;
}
#else
for (ep = environ; *ep; ep++)
if (strncmp (*ep, string, name_end - string) == 0
&& (*ep)[name_end - string] == '=')
break;
if (*ep)
*ep = string;
else
{
static char **last_environ = NULL;
size_t size = ep - environ;
char **new_environ = malloc ((size + 2) * sizeof *new_environ);
if (! new_environ)
return -1;
new_environ[0] = string;
memcpy (new_environ + 1, environ, (size + 1) * sizeof *new_environ);
free (last_environ);
last_environ = new_environ;
environ = new_environ;
}
return 0;
#endif
}