#include <algorithm>
#include <iostream>
#include <iterator>
 
int main() {
	char buffer[7];
	std::istream & file = std::cin;
 
    while (true) {
		file.getline(buffer, sizeof buffer);
		auto n = file.gcount();
 
		if (file) {
  	    	std::cout << "Read line with " << n << " characters: '";
  	    	std::copy_n(buffer, n - 1, std::ostream_iterator<char>(std::cout));
	  		std::cout << "'\n";
		} else if (n > 0) {
  			std::cout << "Read incomplete line with prefix '";
	  		std::copy_n(buffer, n - 1, std::ostream_iterator<char>(std::cout));
  			std::cout << "'.\n";
  			file.clear();
		} else {
  			std::cout << "Did not read any lines.\n";
  			break;
		}
    }
}

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Rm9vCkZvb0JhcgpUaGlzTGluZUlzVG9vTG9uZw==

Foo
FooBar
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