#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>

int main()
{
  int fd;
  const size_t size = 13;
  char str[size + 1] = {0};

  if ((fd = open("myfile", O_RDONLY)) < 0)
  {
    printf("Can\'t open file\n");
    exit(-1);
  }

  int offset = 0,
      bytes_read;

  for (; (bytes_read = read(fd, str + offset, size - offset)) > 0;)
  {
    offset += bytes_read;
  }

  printf("%s\n", str);

  if (close(fd) < 0)
  {
    printf("Can\'t close file\n");
  }

  return 0;
}