PrintString.h

// This should *really* be in the Arduino base libraries.
// Stolen with adjustments from https://github.com/RobTillaart/PrintString (MIT)
// (can you even have copyright on a file this simple?)

#pragma once

//
//    FILE: PrintString.h
//  AUTHOR: Rob Tillaart
// VERSION: 0.2.4
// PURPOSE: Class that captures prints into a String
//    DATE: 2017-12-09
//     URL: https://github.com/RobTillaart/PrintString

#include <Arduino.h>
#include <Print.h>

class PrintString : public Print {
public:
	PrintString() = default;

	virtual size_t write(uint8_t c) override
	{
		buffer.concat(char(c));
		return 1;
	}

	virtual size_t write(uint8_t const* str, size_t length) override
	{
		buffer.concat((char*)str, length);
		return length;
	}

	size_t size()
	{
		return buffer.length();
	}

	void clear()
	{
		buffer = String();
	}

	String getString()
	{
		return buffer;
	}

private:
	String buffer;
};