Reading Mixed Serial If/Else ? ?

Projects Programming
3

Here is a non-blocking AT response check I coded recently:

boolean foundOK()
{
  const char targetString[] = {'O', 'K', '\r', '\n'};
  static byte index = 0;
  boolean found = false;

  while (Serial3.available() > 0)
  {
    c = Serial3.read();
    Serial.write(c);
    if (c == targetString[index])
    {
      index++;
      if (index >= sizeof(targetString))
      {
        index = 0;
        Serial.println("found \"OK<cr><lf>\" termination string");
        found = true;
      }
    }
  }
  return found;
}