1: /* Change a port cell to a directory by looking up a name.
    2:    Copyright (C) 1999,2001,02 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 Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the 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:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    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: #include <string.h>
   27: 
   28: int
   29: _hurd_change_directory_port_from_name (struct hurd_port *portcell,
   30:                                        const char *name)
   31: {
   32:   size_t len;
   33:   const char *lookup;
   34:   file_t dir;
   35: 
   36:   /* Append trailing "/." to directory name to force ENOTDIR if it's not a
   37:      directory and EACCES if we don't have search permission.  */
   38:   len = strlen (name);
   39:   if (len >= 2 && name[len - 2] == '/' && name[len - 1] == '.')
   40:     lookup = name;
   41:   else
   42:     {
   43:       char *n = alloca (len + 3);
   44:       memcpy (n, name, len);
   45:       n[len] = '/';
   46:       n[len + 1] = '.';
   47:       n[len + 2] = '\0';
   48:       lookup = n;
   49:     }
   50: 
   51:   dir = __file_name_lookup (lookup, 0, 0);
   52:   if (dir == MACH_PORT_NULL)
   53:     return -1;
   54: 
   55:   _hurd_port_set (portcell, dir);
   56:   return 0;
   57: }