#include <cstdlib>
#include <iostream>
#include "mapped_file.hpp"

int main(int argc, char** argv) {
   if (argc != 2) exit(1);
   const char* filename = argv[1];
   MappedFile mfile(filename);
   if (!mfile.valid()) exit(1);
   std::size_t lines = 0;
   for (const char* cp = mfile.get_addr();
	 cp < mfile.get_addr() + mfile.get_length(); ++cp) {
      if (*cp == '\n') ++lines;
   }
   std::cout << lines << std::endl;
}