password issue in telnet

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hi
 I am implemented telnet server in ide keil. every thing is aproximately working fine but password charter are not hidden or * mask. in this telnet.c file open the socket and recive and send function through socket.
suppose we write password(password) on telnet clent. I am try to solve below 
code:

c = recv(connect,recv_data_tnet, 1, 0);
if((*recv_data_tnet == 0x0d )||(*recv_data_tnet == 0x0a )){
      c = recv_data_tnet[0];
      break;
}
else{
    int j = 0; 
    char format_string[20]={0};                 
    for( ; j<=i ; j++){
        format_string[j] = '\b';
    }
    format_string[j] = '*';

    printf("format string %s\n", format_string);
    send(connect,format_string,j,0);
}
    c = recv_data_tnet[0];      
    pbuffer_tnet[i++] = c;


output: p*s***wd or something like that
please give me advice to implement password on telnet server

Original issue reported on code.google.com by [email protected] on 19 Jun 2014 at 12:29