dsize = &d->d_name[d->d_namlen + 1] - (char *) d;
dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d;
DEFUN(scandir, (dir, namelist, select, cmp),      CONST char *dir AND      struct dirent ***namelist AND      int EXFUN((*select), (struct dirent *)) AND      int EXFUN((*cmp), (CONST PTR, CONST PTR))){  DIR *dp = opendir (dir);  struct dirent **v = NULL;  size_t vsize = 0, i;  struct dirent *d;  int save;  if (dp == NULL)    return -1;  save = errno;  errno = 0;  i = 0;  while ((d = readdir (dp)) != NULL)    if (select == NULL || (*select) (d))      {	size_t dsize;	if (i == vsize)	  {	    struct dirent **new;	    if (vsize == 0)	      vsize = 10;	    else	      vsize *= 2;	    new = (struct dirent **) realloc (v, vsize * sizeof (*v));	    if (new == NULL)	      {	      lose:		errno = ENOMEM;		break;	      }	    v = new;	  }	dsize = &d->d_name[d->d_namlen + 1] - (char *) d;	v[i] = (struct dirent *) malloc (dsize);	if (v[i] == NULL)	  goto lose;	memcpy (v[i++], d, dsize);      }  if (errno != 0)    {      save = errno;      (void) closedir (dp);      while (i > 0)	free (v[--i]);      free (v);      errno = save;      return -1;    }  (void) closedir (dp);  errno = save;  /* Sort the list if we have a comparison function to sort with.  */  if (cmp != NULL)    qsort (v, i, sizeof (*v), cmp);  *namelist = v;  return i;}