DouKaku?

#include <vector>
#include <string>
#include <exception>
#include <stdexcept>

#include <boost/spirit.hpp>
#include <boost/spirit/actor/push_back_actor.hpp>
#include <boost/spirit/actor/clear_actor.hpp>

typedef std::vector<std::string> csv_elem_t;

std::vector<csv_elem_t>
parse_csv(
    std::string lines
    )
{
  using namespace boost::spirit;

  std::vector<csv_elem_t> csv;
  csv_elem_t e;

  rule<> element_r = *((anychar_p - ch_p('"')) | str_p("\"\""));
  rule<> quoted_r = ch_p('"') >> element_r[push_back_a(e)] >> ch_p('"');

  rule<> naked_r = (*(anychar_p - ch_p('"') - ch_p(',') - eol_p))[push_back_a(e)];

  rule<> record_r = list_p((quoted_r|naked_r), ch_p(','));
  rule<> csv_r = list_p(record_r[push_back_a(csv,e)][clear_a(e)], eol_p) >> end_p;

  parse_info<> result = parse(lines.c_str(), csv_r);

  if ( !result.full ) {
    throw std::runtime_error("failed to parse");
  }

  typedef std::vector<csv_elem_t>::iterator csv_list_iter;
  typedef csv_elem_t::iterator csv_iter;
  for ( csv_list_iter clit = csv.begin(); clit != csv.end(); ++clit ) {
    for ( csv_iter cit = clit->begin(); cit != clit->end(); ++cit ) {
      std::string::size_type idx=0;
      while ( (idx = cit->find("\"\"", idx)) != std::string::npos ) {
        cit->replace(idx, 2, "\""); ++idx;
      }
    }
  }

  return csv;
}

int main()
{
  try {
    std::vector<csv_elem_t> csv =
      parse_csv("\"aaa\",\"b\nbb\",\"ccc\",zzz,\"y\"\"Y\"\"y\",xxx");

    std::cout << "total records: " << csv.size() << "\n";

    typedef std::vector<csv_elem_t>::const_iterator csv_list_iter;
    typedef csv_elem_t::const_iterator csv_iter;
    int l = 1;
    for ( csv_list_iter clit = csv.begin(); clit != csv.end(); ++clit,++l ) {
      std::cout << "#" << l << "\n";
      int i = 1;
      for ( csv_iter cit = clit->begin(); cit != clit->end(); ++cit,++i ) {
        std::cout << i << " => " << *cit << "\n";
      }
    }
  }
  catch ( std::exception& e ) {
    std::cerr << e.what() << "\n";
  }
  return 0;
}