1 | /* Change a port cell to a directory by looking up a name. |
2 | Copyright (C) 1999-2022 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 <errno.h> |
20 | #include <unistd.h> |
21 | #include <hurd.h> |
22 | #include <hurd/port.h> |
23 | #include <hurd/fd.h> |
24 | #include <fcntl.h> |
25 | #include <string.h> |
26 | |
27 | int |
28 | _hurd_change_directory_port_from_name (struct hurd_port *portcell, |
29 | const char *name) |
30 | { |
31 | size_t len; |
32 | const char *lookup; |
33 | file_t dir; |
34 | |
35 | /* Append trailing "/." to directory name to force ENOTDIR if it's not a |
36 | directory and EACCES if we don't have search permission. */ |
37 | len = strlen (s: name); |
38 | if (len >= 2 && name[len - 2] == '/' && name[len - 1] == '.') |
39 | lookup = name; |
40 | else if (len == 0) |
41 | /* Special-case empty file name according to POSIX. */ |
42 | return __hurd_fail (ENOENT); |
43 | else |
44 | { |
45 | char *n = alloca (len + 3); |
46 | memcpy (dest: n, src: name, n: len); |
47 | n[len] = '/'; |
48 | n[len + 1] = '.'; |
49 | n[len + 2] = '\0'; |
50 | lookup = n; |
51 | } |
52 | |
53 | dir = __file_name_lookup (lookup, 0, 0); |
54 | if (dir == MACH_PORT_NULL) |
55 | return -1; |
56 | |
57 | _hurd_port_set (portcell, dir); |
58 | return 0; |
59 | } |
60 | |