| /* Copyright (C) 1992-2016 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 <string.h> |
| #include <fcntl.h> |
| |
| |
| /* Translate the error from dir_lookup into the error the user sees. */ |
| static inline error_t |
| lookup_error (error_t error) |
| { |
| switch (error) |
| { |
| case EOPNOTSUPP: |
| case MIG_BAD_ID: |
| /* These indicate that the server does not understand dir_lookup |
| at all. If it were a directory, it would, by definition. */ |
| return ENOTDIR; |
| default: |
| return error; |
| } |
| } |
| |
| error_t |
| __hurd_file_name_lookup (error_t (*use_init_port) |
| (int which, error_t (*operate) (file_t)), |
| file_t (*get_dtable_port) (int fd), |
| error_t (*lookup) |
| (file_t dir, char *name, int flags, mode_t mode, |
| retry_type *do_retry, string_t retry_name, |
| mach_port_t *result), |
| const char *file_name, int flags, mode_t mode, |
| file_t *result) |
| { |
| error_t err; |
| enum retry_type doretry; |
| char retryname[1024]; /* XXX string_t LOSES! */ |
| int startport; |
| |
| error_t lookup_op (mach_port_t startdir) |
| { |
| return lookup_error ((*lookup) (startdir, file_name, flags, mode, |
| &doretry, retryname, result)); |
| } |
| |
| if (! lookup) |
| lookup = __dir_lookup; |
| |
| if (file_name[0] == '\0') |
| return ENOENT; |
| |
| startport = (file_name[0] == '/') ? INIT_PORT_CRDIR : INIT_PORT_CWDIR; |
| while (file_name[0] == '/') |
| file_name++; |
| |
| if (flags & O_NOFOLLOW) /* See lookup-retry.c about O_NOFOLLOW. */ |
| flags |= O_NOTRANS; |
| |
| if (flags & O_DIRECTORY) |
| { |
| /* The caller wants to require that the file we look up is a directory. |
| We can do this without an extra RPC by appending a trailing slash |
| to the file name we look up. */ |
| size_t len = strlen (file_name); |
| if (len == 0) |
| file_name = "/"; |
| else if (file_name[len - 1] != '/') |
| { |
| char *n = alloca (len + 2); |
| memcpy (n, file_name, len); |
| n[len] = '/'; |
| n[len + 1] = '\0'; |
| file_name = n; |
| } |
| } |
| |
| err = (*use_init_port) (startport, &lookup_op); |
| if (! err) |
| err = __hurd_file_name_lookup_retry (use_init_port, get_dtable_port, |
| lookup, doretry, retryname, |
| flags, mode, result); |
| |
| return err; |
| } |
| weak_alias (__hurd_file_name_lookup, hurd_file_name_lookup) |
| |
| error_t |
| __hurd_file_name_split (error_t (*use_init_port) |
| (int which, error_t (*operate) (file_t)), |
| file_t (*get_dtable_port) (int fd), |
| error_t (*lookup) |
| (file_t dir, char *name, int flags, mode_t mode, |
| retry_type *do_retry, string_t retry_name, |
| mach_port_t *result), |
| const char *file_name, |
| file_t *dir, char **name) |
| { |
| error_t addref (file_t crdir) |
| { |
| *dir = crdir; |
| return __mach_port_mod_refs (__mach_task_self (), |
| crdir, MACH_PORT_RIGHT_SEND, +1); |
| } |
| |
| const char *lastslash = strrchr (file_name, '/'); |
| |
| if (lastslash != NULL) |
| { |
| if (lastslash == file_name) |
| { |
| /* "/foobar" => crdir + "foobar". */ |
| *name = (char *) file_name + 1; |
| return (*use_init_port) (INIT_PORT_CRDIR, &addref); |
| } |
| else |
| { |
| /* "/dir1/dir2/.../file". */ |
| char dirname[lastslash - file_name + 1]; |
| memcpy (dirname, file_name, lastslash - file_name); |
| dirname[lastslash - file_name] = '\0'; |
| *name = (char *) lastslash + 1; |
| return |
| __hurd_file_name_lookup (use_init_port, get_dtable_port, lookup, |
| dirname, 0, 0, dir); |
| } |
| } |
| else if (file_name[0] == '\0') |
| return ENOENT; |
| else |
| { |
| /* "foobar" => cwdir + "foobar". */ |
| *name = (char *) file_name; |
| return (*use_init_port) (INIT_PORT_CWDIR, &addref); |
| } |
| } |
| weak_alias (__hurd_file_name_split, hurd_file_name_split) |
| |
| /* This is the same as hurd_file_name_split, except that it ignores |
| trailing slashes (so *NAME is never ""). */ |
| error_t |
| __hurd_directory_name_split (error_t (*use_init_port) |
| (int which, error_t (*operate) (file_t)), |
| file_t (*get_dtable_port) (int fd), |
| error_t (*lookup) |
| (file_t dir, char *name, int flags, mode_t mode, |
| retry_type *do_retry, string_t retry_name, |
| mach_port_t *result), |
| const char *file_name, |
| file_t *dir, char **name) |
| { |
| error_t addref (file_t crdir) |
| { |
| *dir = crdir; |
| return __mach_port_mod_refs (__mach_task_self (), |
| crdir, MACH_PORT_RIGHT_SEND, +1); |
| } |
| |
| const char *lastslash = strrchr (file_name, '/'); |
| |
| if (lastslash != NULL && lastslash[1] == '\0') |
| { |
| /* Trailing slash doesn't count. Look back further. */ |
| |
| /* Back up over all trailing slashes. */ |
| while (lastslash > file_name && *lastslash == '/') |
| --lastslash; |
| |
| /* Find the last one earlier in the string, before the trailing ones. */ |
| lastslash = __memrchr (file_name, '/', lastslash - file_name); |
| } |
| |
| if (lastslash != NULL) |
| { |
| if (lastslash == file_name) |
| { |
| /* "/foobar" => crdir + "foobar". */ |
| *name = (char *) file_name + 1; |
| return (*use_init_port) (INIT_PORT_CRDIR, &addref); |
| } |
| else |
| { |
| /* "/dir1/dir2/.../file". */ |
| char dirname[lastslash - file_name + 1]; |
| memcpy (dirname, file_name, lastslash - file_name); |
| dirname[lastslash - file_name] = '\0'; |
| *name = (char *) lastslash + 1; |
| return |
| __hurd_file_name_lookup (use_init_port, get_dtable_port, lookup, |
| dirname, 0, 0, dir); |
| } |
| } |
| else if (file_name[0] == '\0') |
| return ENOENT; |
| else |
| { |
| /* "foobar" => cwdir + "foobar". */ |
| *name = (char *) file_name; |
| return (*use_init_port) (INIT_PORT_CWDIR, &addref); |
| } |
| } |
| weak_alias (__hurd_directory_name_split, hurd_directory_name_split) |
| |
| |
| file_t |
| __file_name_lookup (const char *file_name, int flags, mode_t mode) |
| { |
| error_t err; |
| file_t result; |
| |
| err = __hurd_file_name_lookup (&_hurd_ports_use, &__getdport, 0, |
| file_name, flags, mode & ~_hurd_umask, |
| &result); |
| |
| return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; |
| } |
| weak_alias (__file_name_lookup, file_name_lookup) |
| |
| |
| file_t |
| __file_name_split (const char *file_name, char **name) |
| { |
| error_t err; |
| file_t result; |
| |
| err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0, |
| file_name, &result, name); |
| |
| return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; |
| } |
| weak_alias (__file_name_split, file_name_split) |
| |
| file_t |
| __directory_name_split (const char *directory_name, char **name) |
| { |
| error_t err; |
| file_t result; |
| |
| err = __hurd_directory_name_split (&_hurd_ports_use, &__getdport, 0, |
| directory_name, &result, name); |
| |
| return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; |
| } |
| weak_alias (__directory_name_split, directory_name_split) |
| |
| |
| file_t |
| __file_name_lookup_under (file_t startdir, |
| const char *file_name, int flags, mode_t mode) |
| { |
| error_t err; |
| file_t result; |
| |
| 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_file_name_lookup (&use_init_port, &__getdport, 0, |
| file_name, flags, mode & ~_hurd_umask, |
| &result); |
| |
| return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; |
| } |
| weak_alias (__file_name_lookup_under, file_name_lookup_under) |