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glibc  2.9
hurdchdir.c
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00001 /* Change a port cell to a directory by looking up a name.
00002    Copyright (C) 1999,2001,02 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <unistd.h>
00022 #include <hurd.h>
00023 #include <hurd/port.h>
00024 #include <hurd/fd.h>
00025 #include <fcntl.h>
00026 #include <string.h>
00027 
00028 int
00029 _hurd_change_directory_port_from_name (struct hurd_port *portcell,
00030                                    const char *name)
00031 {
00032   size_t len;
00033   const char *lookup;
00034   file_t dir;
00035 
00036   /* Append trailing "/." to directory name to force ENOTDIR if it's not a
00037      directory and EACCES if we don't have search permission.  */
00038   len = strlen (name);
00039   if (len >= 2 && name[len - 2] == '/' && name[len - 1] == '.')
00040     lookup = name;
00041   else
00042     {
00043       char *n = alloca (len + 3);
00044       memcpy (n, name, len);
00045       n[len] = '/';
00046       n[len + 1] = '.';
00047       n[len + 2] = '\0';
00048       lookup = n;
00049     }
00050 
00051   dir = __file_name_lookup (lookup, 0, 0);
00052   if (dir == MACH_PORT_NULL)
00053     return -1;
00054 
00055   _hurd_port_set (portcell, dir);
00056   return 0;
00057 }