C言語でハードディスクに直接書き込む方法

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define BUFSIZE 512

int
main (int argc, char *argv[])
{
  FILE *fpr, *fpw;
  char buf[BUFSIZE];

  if (argc < 3)
    {
      printf ("Invalid arguments\n");
      return 1;
    }

  if (! strcmp (argv[1], "/dev/zero"))
    memset (buf, 0, BUFSIZE);
  else
    {
      fpr = fopen (argv[1], "rb");

      if (fpr == NULL)
        {
          perror ("Cannot open file R.\n");
          return 1;
        }
    }

  fpw = fopen (argv[2], "wb");

  if (fpw == NULL)
    {
      perror ("Cannot open file W.\n");
      return 1;
    }

  if (! strcmp (argv[1], "/dev/zero"))
    while (fwrite (buf, BUFSIZE, 1, fpw) != 0);
  else
    while (fread (buf, BUFSIZE, 1, fpr) != 0)
      fwrite (buf, BUFSIZE, 1, fpw);

  fclose(fpr);
  fclose(fpw);

  return 1;
}

D:\>a.exe c:\log.txt \\.\PhysicalDrive2

Cannot open file W.

: Invalid argument <== プログラムの方は Invalid arguments、複数形



D:\>