Socket Programming in C - Problem with the recv() function

I am writing a little program to learn about socket programming.  So far, it listens on a specific port, and I am able to telnet in and send a message.  It then recieves the message and displays it on the screen.  

My problem is this.  I believe I have to call recv in a while loop, as the entire message (if it is long) may not be recieved all at once.

The code below shows how I am handling the recieving of a message.  The problem is that recv() blocks until.... ?  I get stuck in the loop until I send over a bunch of characters (around 150).  How can I make sure that I get the entire message (if its big), but dont get blocked if the msg is small?

Thanks,
JonathanStart Free Trial

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int readData(int openSocket, char *buf, int bufsize)
{
  int bcount;  //total num bytes read
  int br;      //bytes read in this pass
  bcount= 0;
  br= 0;
  br = recv(openSocket, buf, bufsize-bcount,0);
  bcount += br;
  while (br > 0) //if 0 is returned it means the msg is complete?
  {            
    if ((br= recv(openSocket,buf,bufsize-bcount, 0)) > 0) {
      bcount += br;                
      buf += br;
    }
    else if (br < 0)     
  return(-1);
  }
return(bcount);
}