/*---------------------------------------------------------------------------*/
/*lib.h*/
/*---------------------------------------------------------------------------*/
/*Declarations of basic routines for filesystem manipulations*/
/*---------------------------------------------------------------------------*/
/*Based on the code of unionfs translator.*/
/*---------------------------------------------------------------------------*/
/*Copyright (C) 2001, 2002, 2005, 2008, 2009 Free Software Foundation,
  Inc.  Written by Sergiu Ivanov <unlimitedscolobb@gmail.com>.

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of the
  License, or * (at your option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.*/
/*---------------------------------------------------------------------------*/
#ifndef __LIB_H__
#define __LIB_H__

/*---------------------------------------------------------------------------*/
#define __USE_FILE_OFFSET64
/*---------------------------------------------------------------------------*/
#include <hurd.h>
#include <dirent.h>
#include <stddef.h>
#include <hurd/iohelp.h>
/*---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------*/
/*--------Macros-------------------------------------------------------------*/
/*Alignment of directory entries*/
#define DIRENT_ALIGN 4
/*---------------------------------------------------------------------------*/
/*The offset of the directory name in the directory entry structure*/
#define DIRENT_NAME_OFFS offsetof(struct dirent, d_name)
/*---------------------------------------------------------------------------*/
/*Computes the length of the structure before the name + the name + 0,
  all padded to DIRENT_ALIGN*/
#define DIRENT_LEN(name_len)\
	((DIRENT_NAME_OFFS + (name_len) + 1 + DIRENT_ALIGN - 1) &\
	~(DIRENT_ALIGN - 1))
/*---------------------------------------------------------------------------*/
/*Deallocate the given port for the current task*/
#define PORT_DEALLOC(p) (mach_port_deallocate(mach_task_self(), (p)))
/*---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------*/
/*--------Functions----------------------------------------------------------*/
/*Fetches directory entries for `dir`*/
error_t dir_entries_get (file_t dir,
			 char **dirent_data, /*the list of directory
					       entries as returned by
					       dir_readdir */
			 size_t * dirent_data_size,/*the size of
						     `dirent_data` */
			 struct dirent ***dirent_list/*the array of
						       pointers to
						       beginnings of
						       dirents in
						       dirent_data */
			 );
/*---------------------------------------------------------------------------*/
/*Lookup `name` under `dir` (or cwd, if `dir` is invalid)*/
error_t file_lookup (file_t dir, char *name,
		     int flags0, /*try to open with these flags first */
		     int flags1, /*try to open with these flags, if
				   `flags0` fail */
		     int mode,	 /*if the file is to be created, create
				  it with this mode */
		     file_t * port, /*store the port to the looked up
				      file here */
		     io_statbuf_t * stat /*store the stat information here */
		     );
/*---------------------------------------------------------------------------*/
/*Checks whether `user` has the right to open the node described by
  `stat` with `flags`*/
error_t
  check_open_permissions
  (struct iouser *user, io_statbuf_t * stat, int flags);
/*---------------------------------------------------------------------------*/
#endif /*__LIB_H__*/