aprintf

int aprintf(char *str, ...) {
	int i, j, count = 0;

	va_list argv;
	va_start(argv, str);
	for(i = 0, j = 0; str[i] != '\0'; i++) {
		if (str[i] == '%') {
			count++;

			Serial.write(reinterpret_cast<const uint8_t*>(str+j), i-j);

			switch (str[++i]) {
				case 'd': Serial.print(va_arg(argv, int));
					break;
				case 'l': Serial.print(va_arg(argv, long));
					break;
				case 'f': Serial.print(va_arg(argv, double));
					break;
				case 'c': Serial.print((char) va_arg(argv, int));
					break;
				case 's': Serial.print(va_arg(argv, char *));
					break;
				case '%': Serial.print("%");
					break;
				default:;
			};

			j = i+1;
		}
	};
	va_end(argv);

	if(i > j) {
		Serial.write(reinterpret_cast<const uint8_t*>(str+j), i-j);
	}

	return count;
}