#include <sys/types.h> 
#include <sys/stat.h> 
#include <fcntl.h> 
#include <unistd.h>
#include <errno.h>

/*
 * Creates the input files for testing our copy program
 */
int main(int argc, char *argv[]) {
  int fildes;
  mode_t mode;
  char *buf;
  ssize_t bytes_written;
  int i;
  int blksize = 8192;

  // Set up the data buffer
  buf = (char *)malloc(blksize);
  for(i = 0; i < blksize; i++) {
    buf[i] = 'a';
  }
  
  // Create file 1
  fildes = creat("file1", 0777);
  if(fildes == -1) {
    printf("Error opening output file\n");
    exit(-1);
  }
  write(fildes, buf, blksize);
  close(fildes);

  // Create file 2
  fildes = creat("file2", 0777);
  if(fildes == -1) {
    printf("Error opening output file\n");
    exit(-1);
  }
  for(i = 0; i < 1024*1024/blksize; i++)
    write(fildes, buf, blksize);
  close(fildes);

  // Create file 3
  fildes = creat("file3", 0777);
  if(fildes == -1) {
    printf("Error opening output file\n");
    exit(-1);
  }
  write(fildes, buf, blksize);
  lseek(fildes, 1024*1024-2*blksize, SEEK_CUR);
  write(fildes, buf, blksize);
  close(fildes);

  free(buf);

}