source: vendor/bash/3.1-p17/lib/glob/ndir.h

/* <dir.h> -- definitions for 4.2BSD-compatible directory access.
   last edit:   09-Jul-1983     D A Gwyn. */

#if defined (VMS)
#  if !defined (FAB$C_BID)
#    include <fab.h>
#  endif
#  if !defined (NAM$C_BID)
#    include <nam.h>
#  endif
#  if !defined (RMS$_SUC)
#    include <rmsdef.h>
#  endif
#  include "dir.h"
#endif /* VMS */

/* Size of directory block. */
#define DIRBLKSIZ 512

/* NOTE:  MAXNAMLEN must be one less than a multiple of 4 */

#if defined (VMS)
#  define MAXNAMLEN (DIR$S_NAME + 7)    /* 80 plus room for version #.  */
#  define MAXFULLSPEC NAM$C_MAXRSS      /* Maximum full spec */
#else
#  define MAXNAMLEN 15                  /* Maximum filename length. */
#endif /* VMS */

/* Data from readdir (). */
struct direct {
  long d_ino;                   /* Inode number of entry. */
  unsigned short d_reclen;      /* Length of this record. */
  unsigned short d_namlen;      /* Length of string in d_name. */
  char d_name[MAXNAMLEN + 1];   /* Name of file. */
};

/* Stream data from opendir (). */
typedef struct {
  int dd_fd;                    /* File descriptor. */
  int dd_loc;                   /* Offset in block. */
  int dd_size;                  /* Amount of valid data. */
  char  dd_buf[DIRBLKSIZ];      /* Directory block. */
} DIR;

extern DIR *opendir ();
extern struct direct *readdir ();
extern long telldir ();
extern void seekdir (), closedir ();

#define rewinddir(dirp) seekdir (dirp, 0L)