LCOM1920-T02G10

/*        $NetBSD: dirent.h,v 1.29 2015/02/26 02:05:54 dholland Exp $        */

/*-

 * Copyright (c) 1989, 1993

 *        The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *        @(#)dirent.h        8.3 (Berkeley) 8/10/94

 */

#ifndef _SYS_DIRENT_H_

#define _SYS_DIRENT_H_

#include <sys/featuretest.h>

/*

 * The dirent structure defines the format of directory entries returned by

 * the getdents(2) system call.

 *

 * A directory entry has a struct dirent 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 

 * _DIRENT_ALIGN() byte boundary with null bytes.  All names are guaranteed

 * NUL terminated.  The maximum length of a name in a directory is MAXNAMLEN.

 */

struct dirent {

        ino_t d_fileno;                        /* file number of entry */

        uint16_t d_reclen;                /* length of this record */

        uint16_t d_namlen;                /* length of string in d_name */

        uint8_t  d_type;                 /* file type, see below */

#if defined(_NETBSD_SOURCE)

#define        MAXNAMLEN        511                /* must be kept in sync with NAME_MAX */

        char        d_name[MAXNAMLEN + 1];        /* name must be no longer than this */

#else

        char        d_name[511 + 1];        /* name must be no longer than this */

#endif

};

#if defined(_NETBSD_SOURCE)

/*

 * File types

 */

#define        DT_UNKNOWN         0

#define        DT_FIFO                 1

#define        DT_CHR                 2

#define        DT_DIR                 4

#define        DT_BLK                 6

#define        DT_REG                 8

#define        DT_LNK                10

#define        DT_SOCK                12

#define        DT_WHT                14

/*

 * Caution: the following macros are used by the ufs/ffs code on ffs's

 * struct direct as well as the exposed struct dirent. The two

 * structures are not the same, so it's important (until ufs is fixed,

 * XXX) that the macro definitions remain type-polymorphic.

 */

/*

 * The _DIRENT_ALIGN macro returns the alignment of struct dirent.

 * struct direct and struct dirent12 used 4 byte alignment but

 * struct dirent uses 8.

 */

#define _DIRENT_ALIGN(dp) (sizeof((dp)->d_fileno) - 1)

/*

 * The _DIRENT_NAMEOFF macro returns the offset of the d_name field in 

 * struct dirent

 */

#if __GNUC_PREREQ__(4, 0)

#define        _DIRENT_NAMEOFF(dp)        __builtin_offsetof(__typeof__(*(dp)), d_name)

#else

#define _DIRENT_NAMEOFF(dp) \

    ((char *)(void *)&(dp)->d_name - (char *)(void *)dp)

#endif

/*

 * The _DIRENT_RECLEN macro gives the minimum record length which will hold

 * a name of size "namlen".  This requires the amount of space in struct dirent

 * without the d_name field, plus enough space for the name with a terminating

 * null byte (namlen+1), rounded up to a the appropriate byte boundary.

 */

#define _DIRENT_RECLEN(dp, namlen) \

    ((_DIRENT_NAMEOFF(dp) + (namlen) + 1 + _DIRENT_ALIGN(dp)) & \

    ~_DIRENT_ALIGN(dp))

/*

 * The _DIRENT_SIZE macro returns the minimum record length required for

 * name name stored in the current record.

 */

#define        _DIRENT_SIZE(dp) _DIRENT_RECLEN(dp, (dp)->d_namlen)

/*

 * The _DIRENT_NEXT macro advances to the next dirent record.

 */

#define _DIRENT_NEXT(dp) ((void *)((char *)(void *)(dp) + (dp)->d_reclen))

/*

 * The _DIRENT_MINSIZE returns the size of an empty (invalid) record.

 */

#define _DIRENT_MINSIZE(dp) _DIRENT_RECLEN(dp, 0)

/*

 * Convert between stat structure types and directory types.

 */

#define        IFTODT(mode)        (((mode) & 0170000) >> 12)

#define        DTTOIF(dirtype)        ((dirtype) << 12)

#endif

#endif        /* !_SYS_DIRENT_H_ */