#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>

using namespace std;

void FileCopy(char *fromFile, char *toFile) {
  int fromFD = open(fromFile, O_RDONLY);
  if (fromFD < 0) {
    cerr << "Error opening " << fromFile << "\n"; return;
  }
  int toFD = creat(toFile, 0666);
  if (toFD < 0) {
    cerr <<
	 "Error opening "<< toFile << "\n"; 
    close(fromFD); return;
  }
  while (1) {
    char ch;
    int n = read (fromFD, &ch, 1);
    if (n <= 0) break;   // end of file
    n = write(toFD, &ch, 1);
    if (n < 0) {cerr << "Error\n"; return;}
  }
  close(fromFD); close(toFD);
}

main(int argc, char * argv[])
{
  if (argc != 3) {
    cerr << "Usage: a.out srcfile dstfile\n";
    exit(1);
  }
  FileCopy(argv[1], argv[2]);
}