usr/src/include/dirent.h

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)dirent.h    5.8 (Berkeley) %G%
 */

#ifndef _DIRENT_
#define _DIRENT_

/*
 * A directory entry has a struct direct at the front of it,
 * containing its inode number, the length of the entry, and the
 * length of the name contained in the entry.  These are followed
 * by the name padded to a 4 byte boundary with null bytes.  All
 * names are guaranteed null terminated.  The maximum length of a
 * name in a directory is MAXNAMLEN.
 */
#define MAXNAMLEN       255

struct  dirent {
        u_long  d_fileno;               /* file number of entry */
        u_short d_reclen;               /* length of this record */
        u_short d_namlen;               /* length of string in d_name */
        char    d_name[MAXNAMLEN + 1];  /* name must be no longer than this */
};
#define d_ino d_fileno          /* backward compatibility */

/*
 * Definitions for library routines operating on directories.
 */
#define DIRBLKSIZ       1024

/*
 * This structure describes an open directory.
 */
typedef struct _dirdesc {
        int     dd_fd;          /* file descriptor associated with directory */
        long    dd_loc;         /* offset in current buffer */
        long    dd_size;        /* amount of data returned by getdirentries */
        char    *dd_buf;        /* data buffer */
        int     dd_len;         /* size of data buffer */
        long    dd_seek;        /* magic cookie returned by getdirentries */
} DIR;

#define dirfd(dirp)     ((dirp)->dd_fd)

#ifndef NULL
#define NULL 0
#endif

extern  long _rewinddir;
#define rewinddir(dirp) \
        _seekdir((dirp), _rewinddir), \
        _rewinddir = telldir(dirp)

#ifdef __STDC__
extern DIR *opendir(const char *);
extern struct dirent *readdir(DIR *);
extern long telldir(const DIR *);
extern void seekdir(DIR *, long);
extern void closedir(DIR *);
extern int scandir(const char *, struct direct *(*[]),
    int (* )(struct direct *), int (* )(char *, char *));
extern int alphasort(const struct direct **, const struct direct **);
#else
extern DIR *opendir();
extern struct dirent *readdir();
extern long telldir();
extern void seekdir();
extern void closedir();
extern int scandir();
extern int alphasort();
#endif
#endif /* _DIRENT_ */