Correct DT_LOOS and DT_HIOS values.
[glibc.git] / hurd / hurdlookup.c
blobc1f6ad7c6674b49c351704ca38bdea5ef03d65d7
1 /* Copyright (C) 1992,93,94,95,96,97,99,2001 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <hurd.h>
20 #include <hurd/lookup.h>
21 #include <string.h>
22 #include <fcntl.h>
25 /* Translate the error from dir_lookup into the error the user sees. */
26 static inline error_t
27 lookup_error (error_t error)
29 switch (error)
31 case EOPNOTSUPP:
32 case MIG_BAD_ID:
33 /* These indicate that the server does not understand dir_lookup
34 at all. If it were a directory, it would, by definition. */
35 return ENOTDIR;
36 default:
37 return error;
41 error_t
42 __hurd_file_name_lookup (error_t (*use_init_port)
43 (int which, error_t (*operate) (file_t)),
44 file_t (*get_dtable_port) (int fd),
45 error_t (*lookup)
46 (file_t dir, char *name, int flags, mode_t mode,
47 retry_type *do_retry, string_t retry_name,
48 mach_port_t *result),
49 const char *file_name, int flags, mode_t mode,
50 file_t *result)
52 error_t err;
53 enum retry_type doretry;
54 char retryname[1024]; /* XXX string_t LOSES! */
55 int startport;
57 error_t lookup_op (mach_port_t startdir)
59 return lookup_error ((*lookup) (startdir, file_name, flags, mode,
60 &doretry, retryname, result));
63 if (! lookup)
64 lookup = __dir_lookup;
66 if (file_name[0] == '\0')
67 return ENOENT;
69 startport = (file_name[0] == '/') ? INIT_PORT_CRDIR : INIT_PORT_CWDIR;
70 while (file_name[0] == '/')
71 file_name++;
73 if (flags & O_NOFOLLOW) /* See lookup-retry.c about O_NOFOLLOW. */
74 flags |= O_NOTRANS;
76 if (flags & O_DIRECTORY)
78 /* The caller wants to require that the file we look up is a directory.
79 We can do this without an extra RPC by appending a trailing slash
80 to the file name we look up. */
81 size_t len = strlen (file_name);
82 if (len == 0)
83 file_name = "/";
84 else if (file_name[len - 1] != '/')
86 char *n = alloca (len + 2);
87 memcpy (n, file_name, len);
88 n[len] = '/';
89 n[len + 1] = '\0';
90 file_name = n;
94 err = (*use_init_port) (startport, &lookup_op);
95 if (! err)
96 err = __hurd_file_name_lookup_retry (use_init_port, get_dtable_port,
97 lookup, doretry, retryname,
98 flags, mode, result);
100 return err;
102 weak_alias (__hurd_file_name_lookup, hurd_file_name_lookup)
104 error_t
105 __hurd_file_name_split (error_t (*use_init_port)
106 (int which, error_t (*operate) (file_t)),
107 file_t (*get_dtable_port) (int fd),
108 error_t (*lookup)
109 (file_t dir, char *name, int flags, mode_t mode,
110 retry_type *do_retry, string_t retry_name,
111 mach_port_t *result),
112 const char *file_name,
113 file_t *dir, char **name)
115 error_t addref (file_t crdir)
117 *dir = crdir;
118 return __mach_port_mod_refs (__mach_task_self (),
119 crdir, MACH_PORT_RIGHT_SEND, +1);
122 const char *lastslash = strrchr (file_name, '/');
124 if (lastslash != NULL)
126 if (lastslash == file_name)
128 /* "/foobar" => crdir + "foobar". */
129 *name = (char *) file_name + 1;
130 return (*use_init_port) (INIT_PORT_CRDIR, &addref);
132 else
134 /* "/dir1/dir2/.../file". */
135 char dirname[lastslash - file_name + 1];
136 memcpy (dirname, file_name, lastslash - file_name);
137 dirname[lastslash - file_name] = '\0';
138 *name = (char *) lastslash + 1;
139 return
140 __hurd_file_name_lookup (use_init_port, get_dtable_port, lookup,
141 dirname, 0, 0, dir);
144 else
146 /* "foobar" => cwdir + "foobar". */
147 *name = (char *) file_name;
148 return (*use_init_port) (INIT_PORT_CWDIR, &addref);
151 weak_alias (__hurd_file_name_split, hurd_file_name_split)
153 /* This is the same as hurd_file_name_split, except that it ignores
154 trailing slashes (so *NAME is never ""). */
155 error_t
156 __hurd_directory_name_split (error_t (*use_init_port)
157 (int which, error_t (*operate) (file_t)),
158 file_t (*get_dtable_port) (int fd),
159 error_t (*lookup)
160 (file_t dir, char *name, int flags, mode_t mode,
161 retry_type *do_retry, string_t retry_name,
162 mach_port_t *result),
163 const char *file_name,
164 file_t *dir, char **name)
166 error_t addref (file_t crdir)
168 *dir = crdir;
169 return __mach_port_mod_refs (__mach_task_self (),
170 crdir, MACH_PORT_RIGHT_SEND, +1);
173 const char *lastslash = strrchr (file_name, '/');
175 if (lastslash != NULL && lastslash[1] == '\0')
177 /* Trailing slash doesn't count. Look back further. */
179 /* Back up over all trailing slashes. */
180 while (lastslash > file_name && *lastslash == '/')
181 --lastslash;
183 /* Find the last one earlier in the string, before the trailing ones. */
184 #if __GLIBC__ > 2 || __GLIBC_MINOR__ >= 2
185 lastslash = __memrchr (file_name, '/', lastslash - file_name);
186 #else
187 /* Keep backing up, looking for a slash. */
189 if (lastslash == file_name)
191 /* Hit the start with no slash. */
192 lastslash = NULL;
193 break;
195 while (*lastslash-- != '/');
196 #endif
199 if (lastslash != NULL)
201 if (lastslash == file_name)
203 /* "/foobar" => crdir + "foobar". */
204 *name = (char *) file_name + 1;
205 return (*use_init_port) (INIT_PORT_CRDIR, &addref);
207 else
209 /* "/dir1/dir2/.../file". */
210 char dirname[lastslash - file_name + 1];
211 memcpy (dirname, file_name, lastslash - file_name);
212 dirname[lastslash - file_name] = '\0';
213 *name = (char *) lastslash + 1;
214 return
215 __hurd_file_name_lookup (use_init_port, get_dtable_port, lookup,
216 dirname, 0, 0, dir);
219 else
221 /* "foobar" => cwdir + "foobar". */
222 *name = (char *) file_name;
223 return (*use_init_port) (INIT_PORT_CWDIR, &addref);
226 weak_alias (__hurd_directory_name_split, hurd_directory_name_split)
229 file_t
230 __file_name_lookup (const char *file_name, int flags, mode_t mode)
232 error_t err;
233 file_t result;
235 err = __hurd_file_name_lookup (&_hurd_ports_use, &__getdport, 0,
236 file_name, flags, mode & ~_hurd_umask,
237 &result);
239 return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
241 weak_alias (__file_name_lookup, file_name_lookup)
244 file_t
245 __file_name_split (const char *file_name, char **name)
247 error_t err;
248 file_t result;
250 err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0,
251 file_name, &result, name);
253 return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
255 weak_alias (__file_name_split, file_name_split)
257 file_t
258 __directory_name_split (const char *directory_name, char **name)
260 error_t err;
261 file_t result;
263 err = __hurd_directory_name_split (&_hurd_ports_use, &__getdport, 0,
264 directory_name, &result, name);
266 return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
268 weak_alias (__directory_name_split, directory_name_split)
271 file_t
272 __file_name_lookup_under (file_t startdir,
273 const char *file_name, int flags, mode_t mode)
275 error_t err;
276 file_t result;
278 error_t use_init_port (int which, error_t (*operate) (mach_port_t))
280 return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
281 _hurd_ports_use (which, operate));
284 err = __hurd_file_name_lookup (&use_init_port, &__getdport, 0,
285 file_name, flags, mode & ~_hurd_umask,
286 &result);
288 return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
290 weak_alias (__file_name_lookup_under, file_name_lookup_under)