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8f0c527e | 1 | /* Filename lookup using a search path |
bfff8b1b | 2 | Copyright (C) 1995-2017 Free Software Foundation, Inc. |
478b92f0 | 3 | This file is part of the GNU C Library. |
8f0c527e RM |
4 | Written by Miles Bader <miles@gnu.ai.mit.edu> |
5 | ||
478b92f0 | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
8f0c527e | 10 | |
478b92f0 UD |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8f0c527e | 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 14 | Lesser General Public License for more details. |
8f0c527e | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
8f0c527e RM |
19 | |
20 | #include <string.h> | |
21 | #include <hurd.h> | |
22 | #include <hurd/lookup.h> | |
23 | ||
24 | /* If FILE_NAME contains a '/', or PATH is NULL, call FUN with FILE_NAME, and | |
25 | return the result (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to | |
26 | NULL). Otherwise, call FUN repeatedly with FILE_NAME prefixed with each | |
27 | successive `:' separated element of PATH, returning whenever FUN returns | |
28 | 0 (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to the resulting | |
29 | prefixed path). If FUN never returns 0, return the first non-ENOENT | |
30 | return value, or ENOENT if there is none. */ | |
31 | error_t | |
32 | file_name_path_scan (const char *file_name, const char *path, | |
33 | error_t (*fun)(const char *name), | |
34 | char **prefixed_name) | |
35 | { | |
c7a37ad3 | 36 | if (path == NULL || strchr (file_name, '/')) |
8f0c527e RM |
37 | { |
38 | if (prefixed_name) | |
39 | *prefixed_name = 0; | |
40 | return (*fun)(file_name); | |
41 | } | |
42 | else | |
43 | { | |
44 | error_t real_err = 0; | |
45 | size_t file_name_len = strlen (file_name); | |
46 | ||
47 | for (;;) | |
48 | { | |
49 | error_t err; | |
c7a37ad3 | 50 | const char *next = strchr (path, ':') ?: path + strlen (path); |
8f0c527e RM |
51 | size_t pfx_len = next - path; |
52 | char pfxed_name[pfx_len + 2 + file_name_len + 1]; | |
53 | ||
54 | if (pfx_len == 0) | |
55 | pfxed_name[pfx_len++] = '.'; | |
56 | else | |
9596d0dd | 57 | memcpy (pfxed_name, path, pfx_len); |
8f0c527e RM |
58 | if (pfxed_name[pfx_len - 1] != '/') |
59 | pfxed_name[pfx_len++] = '/'; | |
9596d0dd | 60 | memcpy (pfxed_name + pfx_len, file_name, file_name_len + 1); |
8f0c527e RM |
61 | |
62 | err = (*fun)(pfxed_name); | |
63 | if (err == 0) | |
64 | { | |
65 | if (prefixed_name) | |
66 | *prefixed_name = strdup (pfxed_name); | |
67 | return 0; | |
68 | } | |
69 | if (!real_err && err != ENOENT) | |
70 | real_err = err; | |
71 | ||
72 | if (*next == '\0') | |
73 | return real_err ?: ENOENT; | |
74 | else | |
75 | path = next + 1; | |
76 | } | |
77 | } | |
78 | } | |
79 | ||
80 | /* Lookup FILE_NAME and return the node opened with FLAGS & MODE in result | |
81 | (see hurd_file_name_lookup for details), but a simple filename (without | |
6d52618b | 82 | any directory prefixes) will be consecutively prefixed with the pathnames |
8f0c527e RM |
83 | in the `:' separated list PATH until one succeeds in a successful lookup. |
84 | If none succeed, then the first error that wasn't ENOENT is returned, or | |
85 | ENOENT if no other errors were returned. If PREFIXED_NAME is non-NULL, | |
86 | then if RESULT is looked up directly, *PREFIXED_NAME is set to NULL, and | |
87 | if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to | |
88 | malloced storage containing the prefixed name. */ | |
89 | error_t | |
90 | hurd_file_name_path_lookup (error_t (*use_init_port) | |
bf0f4720 | 91 | (int which, error_t (*operate) (mach_port_t)), |
8f0c527e | 92 | file_t (*get_dtable_port) (int fd), |
bf0f4720 MB |
93 | error_t (*lookup) |
94 | (file_t dir, char *name, int flags, mode_t mode, | |
95 | retry_type *do_retry, string_t retry_name, | |
96 | mach_port_t *result), | |
8f0c527e RM |
97 | const char *file_name, const char *path, |
98 | int flags, mode_t mode, | |
99 | file_t *result, char **prefixed_name) | |
100 | { | |
bf0f4720 | 101 | error_t scan_lookup (const char *name) |
8f0c527e RM |
102 | { |
103 | return | |
bf0f4720 | 104 | __hurd_file_name_lookup (use_init_port, get_dtable_port, lookup, |
8f0c527e RM |
105 | name, flags, mode, result); |
106 | } | |
bf0f4720 | 107 | return file_name_path_scan (file_name, path, scan_lookup, prefixed_name); |
8f0c527e RM |
108 | } |
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 | ||
bf0f4720 | 117 | err = hurd_file_name_path_lookup (&_hurd_ports_use, &__getdport, 0, |
8f0c527e RM |
118 | file_name, path, flags, mode, |
119 | &result, prefixed_name); | |
120 | ||
121 | return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; | |
122 | } |