#include <stdio.h>
#include <stdint.h>

int
swrite(const char *s, size_t n, FILE *fp)
{
  size_t r;
  int i;
  r = fwrite(s, n, 1, fp);
  if (r < 1) return -1;
  if ((n % 4) == 0) return 0;
  for (i = 0; i < (4 - (n % 4)); i++) {
    fputc
  }
  return 0;
}

int
main()
{
  FILE *fp;
  fp = fopen("try1.nc", "wb");
  fwrite("CDF\x02", 4, 1, fp);
}