1 | /* |
2 | * Copyright 2012-present Facebook, Inc. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | */ |
16 | |
17 | #include <folly/experimental/io/FsUtil.h> |
18 | |
19 | #include <folly/Exception.h> |
20 | |
21 | namespace bsys = ::boost::system; |
22 | |
23 | namespace folly { |
24 | namespace fs { |
25 | |
26 | namespace { |
27 | bool skipPrefix(const path& pth, const path& prefix, path::const_iterator& it) { |
28 | it = pth.begin(); |
29 | for (auto& p : prefix) { |
30 | if (it == pth.end()) { |
31 | return false; |
32 | } |
33 | if (p == "." ) { |
34 | // Should only occur at the end, if prefix ends with a slash |
35 | continue; |
36 | } |
37 | if (*it++ != p) { |
38 | return false; |
39 | } |
40 | } |
41 | return true; |
42 | } |
43 | } // namespace |
44 | |
45 | bool starts_with(const path& pth, const path& prefix) { |
46 | path::const_iterator it; |
47 | return skipPrefix(pth, prefix, it); |
48 | } |
49 | |
50 | path remove_prefix(const path& pth, const path& prefix) { |
51 | path::const_iterator it; |
52 | if (!skipPrefix(pth, prefix, it)) { |
53 | throw filesystem_error( |
54 | "Path does not start with prefix" , |
55 | pth, |
56 | prefix, |
57 | bsys::errc::make_error_code(bsys::errc::invalid_argument)); |
58 | } |
59 | |
60 | path p; |
61 | for (; it != pth.end(); ++it) { |
62 | p /= *it; |
63 | } |
64 | |
65 | return p; |
66 | } |
67 | |
68 | path canonical_parent(const path& pth, const path& base) { |
69 | return canonical(pth.parent_path(), base) / pth.filename(); |
70 | } |
71 | |
72 | path executable_path() { |
73 | return read_symlink("/proc/self/exe" ); |
74 | } |
75 | |
76 | } // namespace fs |
77 | } // namespace folly |
78 | |