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telnet: use poll, it's shorter

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*: style fixes
This commit is contained in:
Denis Vlasenko
2007-11-06 02:23:39 +00:00
parent cd0fbb5e77
commit 1bec1b980e
5 changed files with 79 additions and 80 deletions
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140
networking/telnet.c
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@ -101,6 +101,7 @@ static void iacflush(void)
#define write_str(fd, str) write(fd, str, sizeof(str) - 1)
static void doexit(int ev) ATTRIBUTE_NORETURN;
static void doexit(int ev)
{
cookmode();
@ -157,31 +158,29 @@ static void conescape(void)
static void handlenetoutput(int len)
{
/* here we could do smart tricks how to handle 0xFF:s in output
* stream like writing twice every sequence of FF:s (thus doing
* many write()s. But I think interactive telnet application does
* not need to be 100% 8-bit clean, so changing every 0xff:s to
* 0x7f:s
/* here we could do smart tricks how to handle 0xFF:s in output
* stream like writing twice every sequence of FF:s (thus doing
* many write()s. But I think interactive telnet application does
* not need to be 100% 8-bit clean, so changing every 0xff:s to
* 0x7f:s
*
* 2002-mar-21, Przemyslaw Czerpak (druzus@polbox.com)
* I don't agree.
* first - I cannot use programs like sz/rz
* second - the 0x0D is sent as one character and if the next
* char is 0x0A then it's eaten by a server side.
* third - whay doy you have to make 'many write()s'?
* I don't understand.
* So I implemented it. It's realy useful for me. I hope that
* others people will find it interesting to.
* 2002-mar-21, Przemyslaw Czerpak (druzus@polbox.com)
* I don't agree.
* first - I cannot use programs like sz/rz
* second - the 0x0D is sent as one character and if the next
* char is 0x0A then it's eaten by a server side.
* third - whay doy you have to make 'many write()s'?
* I don't understand.
* So I implemented it. It's realy useful for me. I hope that
* others people will find it interesting too.
*/
int i, j;
byte * p = (byte*)G.buf;
byte outbuf[4*DATABUFSIZE];
for (i = len, j = 0; i > 0; i--, p++)
{
if (*p == 0x1d)
{
for (i = len, j = 0; i > 0; i--, p++) {
if (*p == 0x1d) {
conescape();
return;
}
@ -200,68 +199,59 @@ static void handlenetinput(int len)
int i;
int cstart = 0;
for (i = 0; i < len; i++)
{
for (i = 0; i < len; i++) {
byte c = G.buf[i];
if (G.telstate == 0) /* most of the time state == 0 */
{
if (c == IAC)
{
if (G.telstate == 0) { /* most of the time state == 0 */
if (c == IAC) {
cstart = i;
G.telstate = TS_IAC;
}
}
else
switch (G.telstate)
{
case TS_0:
if (c == IAC)
G.telstate = TS_IAC;
else
G.buf[cstart++] = c;
break;
} else
switch (G.telstate) {
case TS_0:
if (c == IAC)
G.telstate = TS_IAC;
else
G.buf[cstart++] = c;
break;
case TS_IAC:
if (c == IAC) /* IAC IAC -> 0xFF */
{
G.buf[cstart++] = c;
G.telstate = TS_0;
break;
}
/* else */
switch (c)
{
case SB:
G.telstate = TS_SUB1;
break;
case DO:
case DONT:
case WILL:
case WONT:
G.telwish = c;
G.telstate = TS_OPT;
break;
default:
G.telstate = TS_0; /* DATA MARK must be added later */
}
break;
case TS_OPT: /* WILL, WONT, DO, DONT */
telopt(c);
G.telstate = TS_0;
break;
case TS_SUB1: /* Subnegotiation */
case TS_SUB2: /* Subnegotiation */
if (subneg(c))
G.telstate = TS_0;
break;
}
case TS_IAC:
if (c == IAC) { /* IAC IAC -> 0xFF */
G.buf[cstart++] = c;
G.telstate = TS_0;
break;
}
/* else */
switch (c) {
case SB:
G.telstate = TS_SUB1;
break;
case DO:
case DONT:
case WILL:
case WONT:
G.telwish = c;
G.telstate = TS_OPT;
break;
default:
G.telstate = TS_0; /* DATA MARK must be added later */
}
break;
case TS_OPT: /* WILL, WONT, DO, DONT */
telopt(c);
G.telstate = TS_0;
break;
case TS_SUB1: /* Subnegotiation */
case TS_SUB2: /* Subnegotiation */
if (subneg(c))
G.telstate = TS_0;
break;
}
}
if (G.telstate)
{
if (G.iaclen) iacflush();
if (G.telstate) {
if (G.iaclen) iacflush();
if (G.telstate == TS_0) G.telstate = 0;
len = cstart;
}
@ -440,7 +430,8 @@ static void to_sga(void)
} else if (G.telwish == WONT)
return;
if ((G.telflags ^= UF_SGA) & UF_SGA) /* toggle */
G.telflags ^= UF_SGA; /* toggle */
if (G.telflags & UF_SGA)
putiac2(DO, TELOPT_SGA);
else
putiac2(DONT, TELOPT_SGA);
@ -550,6 +541,9 @@ static void cookmode(void)
tcsetattr(0, TCSADRAIN, &G.termios_def);
}
/* poll gives smaller (-70 bytes) code */
#define USE_POLL 1
int telnet_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int telnet_main(int argc, char **argv)
{