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8f0c527e | 1 | /* Filename lookup using a search path |
581c785b | 2 | Copyright (C) 1995-2022 Free Software Foundation, Inc. |
478b92f0 | 3 | This file is part of the GNU C Library. |
8f0c527e | 4 | |
478b92f0 | 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. | |
8f0c527e | 9 | |
478b92f0 UD |
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 | |
8f0c527e | 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 13 | Lesser General Public License for more details. |
8f0c527e | 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/>. */ |
8f0c527e RM |
18 | |
19 | #include <string.h> | |
20 | #include <hurd.h> | |
21 | #include <hurd/lookup.h> | |
22 | ||
23 | /* If FILE_NAME contains a '/', or PATH is NULL, call FUN with FILE_NAME, and | |
24 | return the result (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to | |
25 | NULL). Otherwise, call FUN repeatedly with FILE_NAME prefixed with each | |
26 | successive `:' separated element of PATH, returning whenever FUN returns | |
27 | 0 (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to the resulting | |
28 | prefixed path). If FUN never returns 0, return the first non-ENOENT | |
29 | return value, or ENOENT if there is none. */ | |
30 | error_t | |
31 | file_name_path_scan (const char *file_name, const char *path, | |
32 | error_t (*fun)(const char *name), | |
33 | char **prefixed_name) | |
34 | { | |
c7a37ad3 | 35 | if (path == NULL || strchr (file_name, '/')) |
8f0c527e RM |
36 | { |
37 | if (prefixed_name) | |
38 | *prefixed_name = 0; | |
39 | return (*fun)(file_name); | |
40 | } | |
41 | else | |
42 | { | |
43 | error_t real_err = 0; | |
44 | size_t file_name_len = strlen (file_name); | |
45 | ||
46 | for (;;) | |
47 | { | |
48 | error_t err; | |
c7a37ad3 | 49 | const char *next = strchr (path, ':') ?: path + strlen (path); |
8f0c527e RM |
50 | size_t pfx_len = next - path; |
51 | char pfxed_name[pfx_len + 2 + file_name_len + 1]; | |
52 | ||
53 | if (pfx_len == 0) | |
54 | pfxed_name[pfx_len++] = '.'; | |
55 | else | |
9596d0dd | 56 | memcpy (pfxed_name, path, pfx_len); |
8f0c527e RM |
57 | if (pfxed_name[pfx_len - 1] != '/') |
58 | pfxed_name[pfx_len++] = '/'; | |
9596d0dd | 59 | memcpy (pfxed_name + pfx_len, file_name, file_name_len + 1); |
8f0c527e RM |
60 | |
61 | err = (*fun)(pfxed_name); | |
62 | if (err == 0) | |
63 | { | |
64 | if (prefixed_name) | |
dba2bdbe | 65 | *prefixed_name = __strdup (pfxed_name); |
8f0c527e RM |
66 | return 0; |
67 | } | |
68 | if (!real_err && err != ENOENT) | |
69 | real_err = err; | |
70 | ||
71 | if (*next == '\0') | |
72 | return real_err ?: ENOENT; | |
73 | else | |
74 | path = next + 1; | |
75 | } | |
76 | } | |
77 | } | |
78 | ||
79 | /* Lookup FILE_NAME and return the node opened with FLAGS & MODE in result | |
80 | (see hurd_file_name_lookup for details), but a simple filename (without | |
6d52618b | 81 | any directory prefixes) will be consecutively prefixed with the pathnames |
8f0c527e RM |
82 | in the `:' separated list PATH until one succeeds in a successful lookup. |
83 | If none succeed, then the first error that wasn't ENOENT is returned, or | |
84 | ENOENT if no other errors were returned. If PREFIXED_NAME is non-NULL, | |
85 | then if RESULT is looked up directly, *PREFIXED_NAME is set to NULL, and | |
86 | if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to | |
87 | malloced storage containing the prefixed name. */ | |
88 | error_t | |
7a8f45e3 ST |
89 | __hurd_file_name_path_lookup (error_t (*use_init_port) |
90 | (int which, error_t (*operate) (mach_port_t)), | |
91 | file_t (*get_dtable_port) (int fd), | |
92 | error_t (*lookup) | |
93 | (file_t dir, const char *name, int flags, mode_t mode, | |
94 | retry_type *do_retry, string_t retry_name, | |
95 | mach_port_t *result), | |
96 | const char *file_name, const char *path, | |
97 | int flags, mode_t mode, | |
98 | file_t *result, char **prefixed_name) | |
8f0c527e | 99 | { |
bf0f4720 | 100 | error_t scan_lookup (const char *name) |
8f0c527e RM |
101 | { |
102 | return | |
bf0f4720 | 103 | __hurd_file_name_lookup (use_init_port, get_dtable_port, lookup, |
8f0c527e RM |
104 | name, flags, mode, result); |
105 | } | |
bf0f4720 | 106 | return file_name_path_scan (file_name, path, scan_lookup, prefixed_name); |
8f0c527e | 107 | } |
7a8f45e3 | 108 | strong_alias (__hurd_file_name_path_lookup, hurd_file_name_path_lookup) |
8f0c527e RM |
109 | |
110 | file_t | |
111 | file_name_path_lookup (const char *file_name, const char *path, | |
112 | int flags, mode_t mode, char **prefixed_name) | |
113 | { | |
114 | error_t err; | |
115 | file_t result; | |
116 | ||
7a8f45e3 ST |
117 | err = __hurd_file_name_path_lookup (&_hurd_ports_use, &__getdport, 0, |
118 | file_name, path, flags, mode, | |
119 | &result, prefixed_name); | |
8f0c527e RM |
120 | |
121 | return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; | |
122 | } |