convert a binary string to HEX format

HexPrint.cpp

#include <string>
#include <iostream>

using std::string;

std::string hexPrint( const char* s, int n ) {
	std::string result;
	char buf[4];
	
	for( int i = 0; i < n; i+= 16 ) {
		int m = ( n - i );
		
		if( m > 16 ) {
			m = 16;
		}
		
		if( !result.empty() ) {
			result += '\n';
		}
		
		for( int j = 0; j < m; j++ ) {
			sprintf( buf, "%02X ", ( s[i+j] & 0xff ) );
			result += buf;
		}
		
		for( int j = m; j < 16; j++ ) {
			result += "   ";
		}
		
		for( int j = 0; j < m; j++ ) {
			if( ::isprint( s[i+j] ) ) {
				result += s[i+j];
			} else {
				result += '.';
			}
		}
	}
	
	return result;
}

int main( int argc, char** argv ) {
	char buf[256];
	
	for( int i = 0; i < 256; i++ ) {
		buf[i] = (char)i;
	}
	
	std::cout << hexPrint( buf, 253 ) << std::endl;
}