int main(int argc, char **argv) {
if(signal(SIGINT, safe_exit) == SIG_ERR) SIGFAIL()
if(signal(SIGQUIT, safe_exit) == SIG_ERR) SIGFAIL()
if(signal(SIGTERM, safe_exit) == SIG_ERR) SIGFAIL()
appname = argv[0];
setconfigdefaults();
if(parseargs(argc, argv) != 0) {
return(1);
}
#ifdef DEBUG
(void)printf("name: %s\n", config.name);
(void)printf("host: %s\n", config.host);
(void)printf("port: %s\n", config.port);
(void)printf("limit: %d\n", (int)config.limit);
#endif
if(createandconnectsocket() != 0) {
cleanup();
return(1);
}
while(rcvmsg() == 0 && quit == 0) {
if(processmsg() != 0) {
break;
}
}
cleanup();
return(0);
}
/**
* Process an incoming character. If it's 0xA4 and not escaped, it's part of an incoming message.
* Also check for bytes indicating message length, the checksum at the end of the message, and so on.
* Basically make sure we get an entire message and when we do, pass it on for further processing to
* determine the type of message and content. If a message is incomplete or doesn't have the right
* checksum (rare), then it is just discarded.
*/
void HDListen::handlebyte(unsigned char cIn) {//protected
switch(msgstate) {
case 0: // wait for start
if(cIn!=0xA4)
return;
msgstate = 1;
msglen = 0;
msgcount = 0;
checksum = 0xA4;
esc = false;
break;
case 1: // wait length
msglen = cIn;
checksum += cIn;
msgstate = 2;
break;
case 2: // read msg
if(cIn==0x1B && !esc) {
esc = true;
return;
}
if (esc) {
esc = false;
if (cIn == 0x48)
cIn = 0xA4;
}
if(msgcount==msglen) {
if(cIn==(checksum & 0xFF)) {
processmsg();
} else {
dprintf("bad checksum, checksum is %02x\n\r",cIn);
ddump("msg",message,msgcount);
dprintf("calc checksum, checksum is %02x\n\r",checksum & 0xFF);
}
msgstate=0;
} else {
checksum += cIn;
message[msgcount++] = cIn;
}
break;
}
}
