Arduino readString

readString.c

int readString(char *buffer, int max_len, int terminator)
{
  int pos = 0;

  while (true) {
    if (Serial.available() > 0) {
      int readch = Serial.read();
      if (readch == terminator) {
        buffer[pos] = '\0';
        break;
      } else if (readch != '\n' && pos < max_len-1) {  // Ignore new-lines
        buffer[pos++] = readch;
      }
    }
  }
  return pos;
}

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  static char buffer[80];
  int len = readString(buffer, sizeof(buffer), '\r');
}