Thread: jumble socket data

I have some data I am wanting to jumble and send over a socket.
All I want to do is add 4 random characters every 4 spaces in the the_data variable.
Can anyone here point me toward some functions or examples that might help me out?

-thanks in advance

Originally Posted by quzah

For what part? Jumbling? Write your own. For sending over a socket? Consider reading Beej's guide. I'm sure your nearest search engine will have a ton of info.


Quzah.

Okay well what I mean is I have no idea how to add 4 random characters every space. I already have that guide and know how to use sockets.

Just write a couple of loops to tackle the problem step by step.

1. Read 4 characters from the source string into a destination string
2. Generate 4 random characters and add them to the destination string
3. Repeat until the string ends

Yes, but I'm pretty new to C. The problem isn't planning it out, what are some functions I can man to help me do this?

thank you very much

Code:

// Read in a string and add four random letters 
// Every four letters in that string

#include <iostream>
#include <string>

int GetRand(int min, int max);

using namespace std;

int main()
{
    char array[100] = "Hello everyone this is my string unblemished";
    char letters[30]= "abcdefghijklmnopqrstuvwxyz";
    
    int size = strlen(array);
    
    for (int i=0; i<size; i++)
    {
        if(i%4==0)
        {
            for (int j=0; j<4; j++)
            {
            int r;
            r = GetRand(0, 25);
            cout<<letters[r];
            }
        }
        
            cout<<array[i];
        
    }
    cin.get();
    return 0;
}                        
            
        
        
        
/*=============================
  Random function definition
  =============================*/

int GetRand(int min, int max)
{
  static int Init = 0;
  int rc;
  
  if (Init == 0)
  {
    /*
     *  As Init is static, it will remember it's value between
     *  function calls.  We only want srand() run once, so this
     *  is a simple way to ensure that happens.
     */
    srand(time(NULL));
    Init = 1;
  }

  /*
   * Formula:  
   *    rand() % N   <- To get a number between 0 - N-1
   *    Then add the result to min, giving you 
   *    a random number between min - max.
   */  
  rc = (rand() % (max - min + 1) + min);
  
  return (rc);
}

This is c++ but you get the idea. I hope this isn't h/w btw

Yeah I just did that as a fail safe. Normally you have to declare it one more than the actual contents to account for the null terminator, I just went a little overboard. HO ho.