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e8f51d56 | 1 | /* Change a port cell to a directory by looking up a name. |
6d7e8eda | 2 | Copyright (C) 1999-2023 Free Software Foundation, Inc. |
e8f51d56 RM |
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 | |
41bdb6e2 AJ |
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. | |
e8f51d56 RM |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
e8f51d56 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
e8f51d56 RM |
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> | |
8a0746ae | 25 | #include <string.h> |
e8f51d56 RM |
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 (name); | |
96c4df50 | 38 | if (len >= 2 && name[len - 2] == '/' && name[len - 1] == '.') |
e8f51d56 | 39 | lookup = name; |
edadcbd6 ST |
40 | else if (len == 0) |
41 | /* Special-case empty file name according to POSIX. */ | |
42 | return __hurd_fail (ENOENT); | |
e8f51d56 RM |
43 | else |
44 | { | |
ab7dd85b | 45 | char *n = alloca (len + 3); |
e8f51d56 RM |
46 | memcpy (n, name, 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 | } |