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- /*
- * Copyright 2012-present Facebook, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include <folly/experimental/io/FsUtil.h>
- #include <folly/Exception.h>
- namespace bsys = ::boost::system;
- namespace folly {
- namespace fs {
- namespace {
- bool skipPrefix(const path& pth, const path& prefix, path::const_iterator& it) {
- it = pth.begin();
- for (auto& p : prefix) {
- if (it == pth.end()) {
- return false;
- }
- if (p == ".") {
- // Should only occur at the end, if prefix ends with a slash
- continue;
- }
- if (*it++ != p) {
- return false;
- }
- }
- return true;
- }
- } // namespace
- bool starts_with(const path& pth, const path& prefix) {
- path::const_iterator it;
- return skipPrefix(pth, prefix, it);
- }
- path remove_prefix(const path& pth, const path& prefix) {
- path::const_iterator it;
- if (!skipPrefix(pth, prefix, it)) {
- throw filesystem_error(
- "Path does not start with prefix",
- pth,
- prefix,
- bsys::errc::make_error_code(bsys::errc::invalid_argument));
- }
- path p;
- for (; it != pth.end(); ++it) {
- p /= *it;
- }
- return p;
- }
- path canonical_parent(const path& pth, const path& base) {
- return canonical(pth.parent_path(), base) / pth.filename();
- }
- path executable_path() {
- return read_symlink("/proc/self/exe");
- }
- } // namespace fs
- } // namespace folly
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