hurd/lookup-at.c

   1 /* Lookup helper function for Hurd implementation of *at functions.
   2    Copyright (C) 2006-2023 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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <hurd.h>
  20 #include <hurd/lookup.h>
  21 #include <hurd/fd.h>
  22 #include <string.h>
  23 #include <fcntl.h>
  24
  25 file_t
  26 __file_name_lookup_at (int fd, int at_flags,
  27                        const char *file_name, int flags, mode_t mode)
  28 {
  29   error_t err;
  30   file_t result;
  31   int empty = at_flags & AT_EMPTY_PATH;
  32
  33   at_flags &= ~AT_EMPTY_PATH;
  34
  35   err = __hurd_at_flags (&at_flags, &flags);
  36   if (err)
  37     return (__hurd_fail (err), MACH_PORT_NULL);
  38
  39   if (fd == AT_FDCWD || file_name[0] == '/')
  40     return __file_name_lookup (file_name, flags, mode);
  41
  42   if (empty != 0 && file_name[0] == '\0')
  43     {
  44       enum retry_type doretry;
  45       char retryname[1024];     /* XXX string_t LOSES! */
  46
  47       err = HURD_DPORT_USE (fd, __dir_lookup (port, "", flags, mode,
  48                                               &doretry, retryname,
  49                                               &result));
  50
  51       if (! err)
  52         err = __hurd_file_name_lookup_retry (&_hurd_ports_use, &__getdport,
  53                                              NULL, doretry, retryname,
  54                                              flags, mode, &result);
  55
  56       return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
  57     }
  58
  59   file_t startdir;
  60   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
  61     {
  62       return (which == INIT_PORT_CWDIR ? (*operate) (startdir)
  63               : _hurd_ports_use (which, operate));
  64     }
  65
  66   err = HURD_DPORT_USE (fd, (startdir = port,
  67                              __hurd_file_name_lookup (&use_init_port,
  68                                                       &__getdport, NULL,
  69                                                       file_name,
  70                                                       flags,
  71                                                       mode & ~_hurd_umask,
  72                                                       &result)));
  73
  74   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
  75 }
  76
  77 file_t
  78 __file_name_split_at (int fd, const char *file_name, char **name)
  79 {
  80   error_t err;
  81   file_t result;
  82
  83   if (fd == AT_FDCWD || file_name[0] == '/')
  84     return __file_name_split (file_name, name);
  85
  86   err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0,
  87                                 file_name, &result, name);
  88
  89   file_t startdir;
  90   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
  91   {
  92     return (which == INIT_PORT_CWDIR ? (*operate) (startdir)
  93             : _hurd_ports_use (which, operate));
  94   }
  95
  96   err = HURD_DPORT_USE (fd, (startdir = port,
  97                              __hurd_file_name_split (&use_init_port,
  98                                                      &__getdport, 0,
  99                                                      file_name,
 100                                                      &result, name)));
 101
 102   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
 103 }
 104
 105 file_t
 106 __directory_name_split_at (int fd, const char *directory_name, char **name)
 107 {
 108   error_t err;
 109   file_t result;
 110
 111   if (fd == AT_FDCWD || directory_name[0] == '/')
 112     return __directory_name_split (directory_name, name);
 113
 114   file_t startdir;
 115   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
 116     {
 117       return (which == INIT_PORT_CWDIR ? (*operate) (startdir)
 118               : _hurd_ports_use (which, operate));
 119     }
 120
 121   err = HURD_DPORT_USE (fd, (startdir = port,
 122                              __hurd_directory_name_split (&use_init_port,
 123                                                           &__getdport, 0,
 124                                                           directory_name,
 125                                                           &result, name)));
 126
 127   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
 128 }