hurd/hurdchdir.c

   1 /* Change a port cell to a directory by looking up a name.
   2    Copyright (C) 1999 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <hurd.h>
  23 #include <hurd/port.h>
  24 #include <hurd/fd.h>
  25 #include <fcntl.h>
  26
  27 int
  28 _hurd_change_directory_port_from_name (struct hurd_port *portcell,
  29                                        const char *name)
  30 {
  31   size_t len;
  32   const char *lookup;
  33   file_t dir;
  34
  35   /* Append trailing "/." to directory name to force ENOTDIR if it's not a
  36      directory and EACCES if we don't have search permission.  */
  37   len = strlen (name);
  38   if (name[len - 2] == '/' && name[len - 1] == '.')
  39     lookup = name;
  40   else
  41     {
  42       char *n = alloca (len + 2);
  43       memcpy (n, name, len);
  44       n[len] = '/';
  45       n[len + 1] = '.';
  46       n[len + 2] = '\0';
  47       lookup = n;
  48     }
  49
  50   dir = __file_name_lookup (lookup, 0, 0);
  51   if (dir == MACH_PORT_NULL)
  52     return -1;
  53
  54   _hurd_port_set (portcell, dir);
  55   return 0;
  56 }