// bug606
//
// 2007-August-07 djones
//
// This illustrates bug 606 in the "readStringUntil" function in the Network library
// There is a similar bug (96) in the "readBytesUntil" function in the Serial library
// The fix has already been posted in the processing bugs database, ...
// ... we just need someone to incorporate the fix(es) into the libraries

import processing.net.*;

Client myClient;
String dataString;
byte[] dataBytes = new byte[512];
int len;

boolean toggle = false;

void setup() {
  size(400,400);
  frameRate(1);
  // open a connection to the local FTP daemon
  // this probably needs to be enabled using Mac System Preferences
  // or change "localhost" to be another FTP server you know about ...
  myClient = new Client(this, "localhost", 21);
}


void draw() {
  // send a command to the FTP server so it will generate some output
  if (random(0,1) < 0.25) {
    myClient.write("help\n");
  }
  
  println("----- ----- ----- ----- ----- ----- ----- -----\n");
  
  if (myClient.available() > 0) {
    toggle = !toggle;
    if (toggle) {
      println("This version is BROKEN ...\n");
      while (myClient.available() > 0) {
        
        //
        // This is the function that contains BUG 606
        //
        dataString = myClient.readStringUntil('\n');
        
        printString(dataString);
      }
    } 
    else {
      println("This version works ...\n");
      while (myClient.available() > 0) {
        
        //
        // This is a workaround for BUG 606
        //
        len = myClient.readBytesUntil('\n',dataBytes);
        dataString = new String(dataBytes);
        dataString = dataString.substring(0,len);
        
        printString(dataString);
      }
    }
  }
}

void printString(String s) {
  if (dataString == null) {
    println("null string");
  } else {
    print("data string = " + s);
  }
}