Handling Form Data from Arduino Web Server (Well Structured)

  if (client.connected() && client.available()) { // read a row
    buffer[0] = client.read();
    buffer[1] = client.read();
    bufindex = 2;
    // read the first line to determinate the request page
    while (buffer[bufindex-2] != '\r' && buffer[bufindex-1] != '\n') { // read full row and save it in buffer
      c = client.read();
      if (bufindex<STRING_BUFFER_SIZE) buffer[bufindex] = c;
      bufindex++;
    }

If there is at least one character from the server in the buffer, read all three. Don't print c and don't print buffer, and don't NULL terminate buffer. OK, I'll bite. Why?