static void do_telnet_read(Telnet telnet, char *buf, int len)
{
while (len--) {
int c = (unsigned char) *buf++;
switch (telnet->state) {
case TOP_LEVEL:
case SEENCR:
if (c == NUL && telnet->state == SEENCR)
telnet->state = TOP_LEVEL;
else if (c == IAC)
telnet->state = SEENIAC;
else {
if (!telnet->in_synch)
c_write1(telnet, c);
#if 1
/* I can't get the F***ing winsock to insert the urgent IAC
* into the right position! Even with SO_OOBINLINE it gives
* it to recv too soon. And of course the DM byte (that
* arrives in the same packet!) appears several K later!!
*
* Oh well, we do get the DM in the right place so I'll
* just stop hiding on the next 0xf2 and hope for the best.
*/
else if (c == DM)
telnet->in_synch = 0;
#endif
if (c == CR && telnet->opt_states[o_they_bin.index] != ACTIVE)
telnet->state = SEENCR;
else
telnet->state = TOP_LEVEL;
}
break;
case SEENIAC:
if (c == DO)
telnet->state = SEENDO;
else if (c == DONT)
telnet->state = SEENDONT;
else if (c == WILL)
telnet->state = SEENWILL;
else if (c == WONT)
telnet->state = SEENWONT;
else if (c == SB)
telnet->state = SEENSB;
else if (c == DM) {
telnet->in_synch = 0;
telnet->state = TOP_LEVEL;
} else {
/* ignore everything else; print it if it's IAC */
if (c == IAC) {
c_write1(telnet, c);
}
telnet->state = TOP_LEVEL;
}
break;
case SEENWILL:
proc_rec_opt(telnet, WILL, c);
telnet->state = TOP_LEVEL;
break;
case SEENWONT:
proc_rec_opt(telnet, WONT, c);
telnet->state = TOP_LEVEL;
break;
case SEENDO:
proc_rec_opt(telnet, DO, c);
telnet->state = TOP_LEVEL;
break;
case SEENDONT:
proc_rec_opt(telnet, DONT, c);
telnet->state = TOP_LEVEL;
break;
case SEENSB:
telnet->sb_opt = c;
telnet->sb_len = 0;
telnet->state = SUBNEGOT;
break;
case SUBNEGOT:
if (c == IAC)
telnet->state = SUBNEG_IAC;
else {
subneg_addchar:
if (telnet->sb_len >= telnet->sb_size) {
telnet->sb_size += SB_DELTA;
telnet->sb_buf = sresize(telnet->sb_buf, telnet->sb_size,
unsigned char);
}
telnet->sb_buf[telnet->sb_len++] = c;
telnet->state = SUBNEGOT; /* in case we came here by goto */
}
break;
case SUBNEG_IAC:
if (c != SE)
goto subneg_addchar; /* yes, it's a hack, I know, but... */
else {
process_subneg(telnet);
telnet->state = TOP_LEVEL;
}
break;
}
}
static void do_telnet_read (char *buf, int len) {
static enum {
TOPLEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT,
SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR
} state = TOPLEVEL;
char b[10];
while (len--) {
int c = (unsigned char) *buf++;
switch (state) {
case TOPLEVEL:
case SEENCR:
if (c == 0 && state == SEENCR)
state = TOPLEVEL;
else if (c == IAC)
state = SEENIAC;
else {
b[0] = c;
if (!in_synch)
c_write (b, 1);
if (c == 13)
state = SEENCR;
else
state = TOPLEVEL;
}
break;
case SEENIAC:
if (c == DO) state = SEENDO;
else if (c == DONT) state = SEENDONT;
else if (c == WILL) state = SEENWILL;
else if (c == WONT) state = SEENWONT;
else if (c == SB) state = SEENSB;
else state = TOPLEVEL; /* we really ignore _everything_ else! */
break;
case SEENWILL:
proc_rec_opt (WILL, c);
state = TOPLEVEL;
break;
case SEENWONT:
proc_rec_opt (WONT, c);
state = TOPLEVEL;
break;
case SEENDO:
proc_rec_opt (DO, c);
state = TOPLEVEL;
break;
case SEENDONT:
proc_rec_opt (DONT, c);
state = TOPLEVEL;
break;
case SEENSB:
sb_opt = c;
sb_len = 0;
state = SUBNEGOT;
break;
case SUBNEGOT:
if (c == IAC)
state = SUBNEG_IAC;
else {
subneg_addchar:
if (sb_len >= sb_size) {
char *newbuf;
sb_size += SB_DELTA;
newbuf = (sb_buf ?
realloc(sb_buf, sb_size) :
malloc(sb_size));
if (newbuf)
sb_buf = newbuf;
else
sb_size -= SB_DELTA;
}
if (sb_len < sb_size)
sb_buf[sb_len++] = c;
state = SUBNEGOT; /* in case we came here by goto */
}
break;
case SUBNEG_IAC:
if (c != SE)
goto subneg_addchar; /* yes, it's a hack, I know, but... */
else {
process_subneg();
state = TOPLEVEL;
}
break;
}
}
}
