*  - people with a key held in Pageant, who might not have
     *    logged in to a particular machine before; so they want to
     *    type a username, and then _either_ their key will be
     *    accepted, _or_ they will type a password. If they mistype
     *    the username they will want to be able to get back and
     *    retype it!
     */
    username[0] = '\0';
    do {
	static int pos;
	static char c;

	/*
	 * Get a username.
	 */
	pos = 0;
	if (*username && !cfg.change_username) {
	    /*
	     * We got a username last time round this loop, and
	     * with change_username turned off we don't try to get
	     * it again.
	     */
	} else if ((flags & FLAG_INTERACTIVE) && !*cfg.username) {
	    if (ssh_get_line) {
		if (!ssh_get_line("login as: ",
				  username, sizeof(username), FALSE)) {
		    /*
		     * get_line failed to get a username.
		     * Terminate.
		     */