#include <stdio.h> 
#include <stdlib.h> 
#include <iostream> 
#include <fstream> 
 
using namespace std; 
 
char buf[256]; 
int index = 0; 
 
class mysb : public streambuf 
{ 
	int overflow (int c) 
	{ 
		buf[index] = c; 
		buf[index + 1] = 0; 
		index++; 
		if ((index > 200) || (c == '\n')) 
		{ 
			printf ("> %s\n", buf); 
			index = 0; 
		} 
		return (1); 
	} 
	int underflow () 
	{ 
		return (EOF); 
	} 
}; 
 
int main () 
{ 
	mysb s; 
	streambuf* old; 
 
	ifstream f ("../mgr/requirements"); 
	if (f) 
	{ 
		cout << "opened" << endl; 
		f.close (); 
	} 
 
	cout << "aaa" << endl; 
 
	old = cout.rdbuf (&s); 
	//cout = &s; 
 
	cout << "bbb" << endl; 
 
	old = cout.rdbuf (old); 
	//cout = old; 
 
	cout << "ccc" << endl; 
 
	return (0); 
}