/* Lookup helper function for Hurd implementation of *at functions.

   Copyright (C) 2006-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <hurd.h>

#include <hurd/lookup.h>

#include <hurd/fd.h>

#include <string.h>

#include <fcntl.h>

file_t

__file_name_lookup_at (int fd, int at_flags,

		       const char *file_name, int flags, mode_t mode)

{

  error_t err;

  file_t result;

  err = __hurd_at_flags (&at_flags, &flags);

  if (err)

    return (__hurd_fail (err), MACH_PORT_NULL);

  if (fd == AT_FDCWD || file_name[0] == '/')

    return __file_name_lookup (file_name, flags, mode);

  file_t startdir;

  error_t use_init_port (int which, error_t (*operate) (mach_port_t))

    {

      return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :

	      _hurd_ports_use (which, operate));

    }

  err = HURD_DPORT_USE (fd, (startdir = port,

			     __hurd_file_name_lookup (&use_init_port,

						      &__getdport, NULL,

						      file_name,

						      flags,

						      mode & ~_hurd_umask,

						      &result)));

  return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;

}

file_t

__file_name_split_at (int fd, const char *file_name, char **name)

{

  error_t err;

  file_t result;

  if (fd == AT_FDCWD || file_name[0] == '/')

    return __file_name_split (file_name, name);

  err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0,

				file_name, &result, name);

  file_t startdir;

  error_t use_init_port (int which, error_t (*operate) (mach_port_t))

  {

    return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :

	    _hurd_ports_use (which, operate));

  }

  err = HURD_DPORT_USE (fd, (startdir = port,

			     __hurd_file_name_split (&use_init_port,

						     &__getdport, 0,

						     file_name,

						     &result, name)));

  return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;

}

file_t

__directory_name_split_at (int fd, const char *directory_name, char **name)

{

  error_t err;

  file_t result;

  if (fd == AT_FDCWD || directory_name[0] == '/')

    return __directory_name_split (directory_name, name);

  file_t startdir;

  error_t use_init_port (int which, error_t (*operate) (mach_port_t))

    {

      return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :

	      _hurd_ports_use (which, operate));

    }

  err = HURD_DPORT_USE (fd, (startdir = port,

			     __hurd_directory_name_split (&use_init_port,

							  &__getdport, 0,

							  directory_name,

							  &result, name)));

  return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;

}