ndir.h

早期freebsd实现

/* $Id: ndir.h,v 3.0 1991/09/09 20:23:31 davison Trn $
 */
/* This software is Copyright 1991 by Stan Barber. 
 *
 * Permission is hereby granted to copy, reproduce, redistribute or otherwise
 * use this software as long as: there is no monetary profit gained
 * specifically from the use or reproduction of this software, it is not
 * sold, rented, traded or otherwise marketed, and this copyright notice is
 * included prominently in any copy made. 
 *
 * The author make no claims as to the fitness or correctness of this software
 * for any use whatsoever, and it is provided as is. Any use of this software
 * is at the user's own risk. 
 */

#ifdef I_NDIR
#include <ndir.h>
#else
#ifdef I_SYS_NDIR
#include <sys/ndir.h>
#else
#ifdef I_SYS_DIR
#include <sys/dir.h>
#else
#ifdef I_DIRENT
#include <dirent.h>
#define direct dirent
#else

#ifndef DEV_BSIZE
#define	DEV_BSIZE	512
#endif
#define DIRBLKSIZ	DEV_BSIZE
#define	MAXNAMLEN	255

struct	direct {
	long	d_ino;			/* inode number of entry */
	short	d_reclen;		/* length of this record */
	short	d_namlen;		/* length of string in d_name */
	char	d_name[MAXNAMLEN + 1];	/* name must be no longer than this */
};

/*
 * The DIRSIZ macro gives the minimum record length which will hold
 * the directory entry.  This requires the amount of space in struct direct
 * without the d_name field, plus enough space for the name with a terminating
 * null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
 */
#undef DIRSIZ
#define DIRSIZ(dp)     ((sizeof (struct direct) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))

/*
 * Definitions for library routines operating on directories.
 */
typedef struct _dirdesc {
	int	dd_fd;
	long	dd_loc;
	long	dd_size;
	char	dd_buf[DIRBLKSIZ];
} DIR;
#ifndef NULL
#define NULL 0
#endif
extern	DIR *opendir _((char*));
extern	struct direct *readdir _((DIR*));
extern	long telldir _((DIR*));
extern	void seekdir _((DIR*));
#define rewinddir(dirp)	seekdir((dirp), (long)0)
extern	void closedir _((DIR*));

#endif
#endif
#endif
#endif