Function ttydisc_echo_force

components/lwp/terminal/freebsd/tty_ttydisc.c:683–726

}

static int ttydisc_echo_force(struct lwp_tty *tp, char c, int quote)
{
    if (CMP_FLAG(l, FLUSHO))
        return 0;

    if (CMP_FLAG(o, OPOST) && CTL_ECHO(c, quote))
    {
        /*
         * Only perform postprocessing when OPOST is turned on
         * and the character is an unquoted BS/TB/NL/CR.
         */
        return ttydisc_write_oproc(tp, c);
    }
    else if (CMP_FLAG(l, ECHOCTL) && CTL_PRINT(c, quote))
    {
        /*
         * Only use ^X notation when ECHOCTL is turned on and
         * we've got an quoted control character.
         *
         * Print backspaces when echoing an end-of-file.
         */
        char ob[4] = "^?\b\b";

        /* Print ^X notation. */
        if (c != 0x7f)
            ob[1] = c + 'A' - 1;

        if (!quote && CMP_CC(VEOF, c))
        {
            return ttyoutq_write_nofrag(&tp->t_outq, ob, 4);
        }
        else
        {
            tp->t_column += 2;
            return ttyoutq_write_nofrag(&tp->t_outq, ob, 2);
        }
    }
    else
    {
        /* Can just be printed. */
        tp->t_column++;
        return ttyoutq_write_nofrag(&tp->t_outq, &c, 1);
    }
}

static int ttydisc_echo(struct lwp_tty *tp, char c, int quote)
{