audk/StdLib/Include/sys/dirent.h

/** @file
  Declarations pertaining to directory entries under the UEFI environment.

  The information is based upon the EFI_FILE_INFO structure
  in MdePkg/Include/Guid/FileInfo.h.

  Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

  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
   NetBSD: dirent.h,v 1.23 2005/12/26 18:41:36 perry Exp
**/

#ifndef _SYS_DIRENT_H_
#define _SYS_DIRENT_H_

#include  <sys/featuretest.h>
#include  <time.h>
#include  <sys/time.h>

#define MAXNAMLEN 511

/*
 * The dirent structure defines the format of directory entries returned by
 * read(fd, ...) when fd refers to a directory.
 *
 * All names are wide characters and are guaranteed to be null terminated.
 * The maximum length of a name in a directory is MAXNAMLEN.
 *
 *  This structure is identical to the EFI_FILE_INFO structure.  A new
 *  structure is declared because one must be able to refer to it
 *  as struct dirent.
 */
struct dirent {
  UINT64            Size;               // (d_reclen) Size of this dirent structure instance,
                                        // including the Null-terminated FileName string.
  UINT64            FileSize;           // The size of the file in bytes.
  UINT64            PhysicalSize;       // The amount of physical space the file consumes
                                        // on the file system volume.
  struct timespec   CreateTime;         // The time the file was created.
  struct timespec   LastAccessTime;     // The time when the file was last accessed.
  struct timespec   ModificationTime;   // The time when the file's contents were last modified.
  UINT64            Attribute;          // (d_type)   The attribute bits for the file. See below.
  CHAR16            FileName[1];        // (d_name)   The Null-terminated name of the file.
};

/*
 * File Attributes
 */
#define DT_UNKNOWN    0
#define DT_READ_ONLY  0x0000000000000001
#define DT_HIDDEN     0x0000000000000002
#define DT_SYSTEM     0x0000000000000004
#define DT_RESERVED   0x0000000000000008
#define DT_DIRECTORY  0x0000000000000010
#define DT_ARCHIVE    0x0000000000000020
#define DT_CHR        0x0000000000010000  // File attaches to a character device
#define DT_BLK        0x0000000000020000  // File attaches to a block device
#define DT_SOCKET     0x0000000000030000  // File attaches to a socket
#define DT_VALID_ATTR 0x0000000000030037  // Mask for valid attribute bits

/*
 * The _DIRENT_ALIGN macro returns the alignment of struct dirent.
 * struct dirent uses 8.
 */
#define _DIRENT_ALIGN(dp) (sizeof((dp)->Size) - 1)

/*
 * The _DIRENT_NAMEOFF macro returns the offset of the d_name field in
 * struct dirent
 */
#define _DIRENT_NAMEOFF(dp) \
    ((char *)(void *)&(dp)->FileName - (char *)(void *)dp)

/*
 * 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))

#define _DIRENT_NAMELEN(dp) \
          ((dp)->Size - _DIRENT_NAMEOFF(dp) - 1)

/*
 * 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, _DIRENT_NAMELEN(dp))

/*
 * The _DIRENT_NEXT macro advances to the next dirent record.
 */
#define _DIRENT_NEXT(dp) ((void *)((char *)(void *)(dp) + (dp)->Size))

/*
 * The _DIRENT_MINSIZE returns the size of an empty (invalid) record.
 */
#define _DIRENT_MINSIZE(dp) _DIRENT_RECLEN(dp, 0)

#endif  /* !_SYS_DIRENT_H_ */