/*
* Append a character string to the output queue, encapsulating it
* appropriately.
* Returns 1 in case the message is truncated.
*/
int
telnet_output(telnet_t *tp, u_char *cp)
{
int len;
u_char c, *bp, buf[TELNET_OUTQ_SIZE + 3];
if (tp->t_flags & TF_OVFLOUTQ)
return 1;
bp = buf;
while (bp < &buf[TELNET_OUTQ_SIZE] && *cp != '\0')
{
c = *cp++;
switch (c)
{
case LF:
*bp++ = CR;
break;
case IAC:
*bp++ = IAC;
break;
}
*bp++ = c;
}
*bp = '\0';
len = bp - buf;
if (len == 0)
return 0;
if (nq_len(tp->t_outq) + len >= TELNET_OUTQ_HIWAT)
{
telnet_flush(tp);
if (nq_len(tp->t_outq) + len >= TELNET_OUTQ_HIWAT)
{
tp->t_flags |= TF_OVFLOUTQ;
buf[TELNET_OUTQ_HIWAT - nq_len(tp->t_outq)] = '\0';
nq_puts(tp->t_outq, buf);
nq_puts(tp->t_outq, (u_char *)"*** Truncated. ***\r\n");
telnet_enabw(tp);
return 1;
}
}
nq_puts(tp->t_outq, buf);
telnet_enabw(tp);
return 0;
}
/*
* Process an Are You There.
*/
static void
telnet_ayt(telnet_t *tp)
{
u_char version[13];
sprintf(version, "[%6.6s%02d]\r\n", GAME_VERSION, PATCH_LEVEL);
nq_puts(tp->t_outq, version);
telnet_enabw(tp);
}
/*
* Write data from the output queue to the Telnet session.
*/
static void
telnet_write(ndesc_t *nd, telnet_t *tp)
{
if (!nq_empty(tp->t_outq))
{
if (nq_send(tp->t_outq, nd_fd(nd), &tp->t_sblen) == -1)
{
switch (errno)
{
case EWOULDBLOCK:
case EINTR:
case EPROTO:
break;
default:
telnet_disconnect(tp);
return;
}
}
}
if (tp->t_flags & TF_OVFLOUTQ)
{
if (nq_len(tp->t_outq) < TELNET_OUTQ_LOWAT)
{
tp->t_flags &= ~TF_OVFLOUTQ;
nq_puts(tp->t_outq, (u_char *)"*** Truncated. ***\r\n");
}
}
if (tp->t_flags & TF_FLOWC)
{
if (nq_len(tp->t_outq) < TELNET_OUTQ_HIWAT)
{
tp->t_flags &= ~TF_FLOWC;
nd_enable(nd, ND_C);
}
}
if (!nq_empty(tp->t_outq))
return;
nq_init(tp->t_outq);
tp->t_flags |= TF_ENABW;
nd_disable(nd, ND_W);
}
