void create_textview()
{
    /* Create the GtkTextView */
    GtkTextView *textview = gtk_text_view_new();  // I actually created mine via Glade

    /* Get the buffer from the GtkTextView */
   GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(textview) );

    /* Connect a callback to the "changed" signal associated with the buffer */
    g_signal_connect
       (
           G_OBJECT( buffer ),
           "changed",
            G_CALLBACK( textview_buffer_changed_callback ),
            info
       );
}

void textview_buffer_changed_callback
(
   GtkTextBuffer  *buffer,
   gpointer        user_data
)
{
   /*
    * Get the current length of the buffer
    */
   int remaining = MAX_BUFFER_LENGTH - 1;

   char text[80];
   if ( remaining > 0 )
   {
      sprintf( text, "%d chars remaining", remaining );
   }
   else
   {
      sprintf( text, "Max chars reached" );

     /*
      *  If the maximum buffer length has been exceeded, then erase the last
      * character entered
      */
      if ( remaining < 0 )
      {
         GtkTextIter start;
         GtkTextIter end;
         gtk_text_buffer_get_iter_at_offset( buffer,
                                             &start,
                                             MAX_BUFFER_LENGTH - 1 ); /* leave room for NULL */
         gtk_text_buffer_get_iter_at_offset( buffer,
                                             &end,
                                             MAX_BUFFER_LENGTH );

         gtk_text_buffer_delete( buffer, &start, &end );
      }
   }

   /* print text to a previously created GtkLabel widget */
   gtk_label_set_text( GTK_LABEL( buffer_label ), text );

}