#include <iostream>  // so I can do reasonable i/o

#include <sys/types.h>  // open at least
#include <sys/stat.h>   // open
#include <fcntl.h>      // open
#include <unistd.h>     // read

#include <string.h>  // strcmp
#include <stdio.h>   // perror

const int BUFFER_SIZE = 1024;

using namespace std;

void Usage(char *);

int main(int argc, char * argv[]) {
   int inputFD, 
       outputFD, 
       openFlags;

   ssize_t numRead;
   char buf[BUFFER_SIZE];

   // open the input file.
   inputFD = open("datafile.dat", O_RDONLY);

   if (inputFD == -1) {
      perror("Could not open the inputfile ");
      return 1;
   }

   // remember the output file contains an int, a float, a char and a string.
   int a;
   float b;
   char c;
   string d;
   
   numRead  = read(inputFD, &a, sizeof(int));
   cout << "The integer is " << a << endl;
   numRead  = read(inputFD, &b, sizeof(float));
   cout << "The float is " << b << endl;
   numRead  = read(inputFD, &c, sizeof(char));
   cout << "The char is " << c << endl;

   // I have a couple of choices here, I could just read to the end of the file
   // I will read until I get to the null.
   while((numRead = read(inputFD, &c, sizeof(char)) != 0) and (c != '\0') ) {
       d += c; 
   }

   cout << "The string is \"" << d << "\"" << endl;

   if (numRead == -1) {
       perror("A read failed");
       return 1;
   }

   if(close(inputFD) == -1) {
       perror("Fail on closing input file");
       return 1;
   }

   return 0;
   
}

void Usage(char * name) {
   cout << "Usage: " << name  << " inputFile outputFile " << endl;
   return;
}