check_restricted(void)
{
    if (restricted)
    {
	emsg(_("E145: Shell commands and some functionality not allowed in rvim"));
	return TRUE;
    }
    return FALSE;
}
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.