tdlight/tdutils/td/utils/port/path.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/port/config.h"
#include "td/utils/common.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/port/FileFd.h"
#include "td/utils/ScopeGuard.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include <utility>
#if TD_PORT_POSIX
#include <dirent.h>
#include <sys/types.h>
#endif
#if TD_DARWIN
#include <sys/syslimits.h>
#endif
#if TD_PORT_WINDOWS
#include "td/utils/port/wstring_convert.h"
#include <string>
#endif
namespace td {
Status mkdir(CSlice dir, int32 mode = 0700) TD_WARN_UNUSED_RESULT;
Status mkpath(CSlice path, int32 mode = 0700) TD_WARN_UNUSED_RESULT;
Status rename(CSlice from, CSlice to) TD_WARN_UNUSED_RESULT;
Result<string> realpath(CSlice slice, bool ignore_access_denied = false) TD_WARN_UNUSED_RESULT;
Status chdir(CSlice dir) TD_WARN_UNUSED_RESULT;
Status rmdir(CSlice dir) TD_WARN_UNUSED_RESULT;
Status unlink(CSlice path) TD_WARN_UNUSED_RESULT;
Status set_temporary_dir(CSlice dir) TD_WARN_UNUSED_RESULT;
CSlice get_temporary_dir();
Result<std::pair<FileFd, string>> mkstemp(CSlice dir) TD_WARN_UNUSED_RESULT;
Result<string> mkdtemp(CSlice dir, Slice prefix) TD_WARN_UNUSED_RESULT;
template <class Func>
Status walk_path(CSlice path, Func &func) TD_WARN_UNUSED_RESULT;
#if TD_PORT_POSIX
// TODO move details somewhere else
namespace detail {
template <class Func>
Status walk_path_dir(string &path, FileFd fd, Func &&func) TD_WARN_UNUSED_RESULT;
template <class Func>
Status walk_path_dir(string &path, Func &&func) TD_WARN_UNUSED_RESULT;
template <class Func>
Status walk_path_file(string &path, Func &&func) TD_WARN_UNUSED_RESULT;
template <class Func>
Status walk_path(string &path, Func &&func) TD_WARN_UNUSED_RESULT;
template <class Func>
Status walk_path_subdir(string &path, DIR *dir, Func &&func) {
while (true) {
errno = 0;
auto *entry = readdir(dir);
auto readdir_errno = errno;
if (readdir_errno) {
return Status::PosixError(readdir_errno, "readdir");
}
if (entry == nullptr) {
return Status::OK();
}
Slice name = Slice(&*entry->d_name);
if (name == "." || name == "..") {
continue;
}
auto size = path.size();
if (path.back() != TD_DIR_SLASH) {
path += TD_DIR_SLASH;
}
path.append(name.begin(), name.size());
SCOPE_EXIT {
path.resize(size);
};
Status status;
#ifdef DT_DIR
if (entry->d_type == DT_UNKNOWN) {
status = walk_path(path, std::forward<Func>(func));
} else if (entry->d_type == DT_DIR) {
status = walk_path_dir(path, std::forward<Func>(func));
} else if (entry->d_type == DT_REG) {
status = walk_path_file(path, std::forward<Func>(func));
}
#else
#warning "Slow walk_path"
status = walk_path(path, std::forward<Func>(func));
#endif
if (status.is_error()) {
return status;
}
}
}
template <class Func>
Status walk_path_dir(string &path, DIR *subdir, Func &&func) {
SCOPE_EXIT {
closedir(subdir);
};
TRY_STATUS(walk_path_subdir(path, subdir, std::forward<Func>(func)));
std::forward<Func>(func)(path, true);
return Status::OK();
}
template <class Func>
Status walk_path_dir(string &path, FileFd fd, Func &&func) {
auto *subdir = fdopendir(fd.get_fd().move_as_native_fd());
if (subdir == nullptr) {
auto error = OS_ERROR("fdopendir");
fd.close();
return error;
}
return walk_path_dir(path, subdir, std::forward<Func>(func));
}
template <class Func>
Status walk_path_dir(string &path, Func &&func) {
auto *subdir = opendir(path.c_str());
if (subdir == nullptr) {
return OS_ERROR(PSLICE() << tag("opendir", path));
}
return walk_path_dir(path, subdir, std::forward<Func>(func));
}
template <class Func>
Status walk_path_file(string &path, Func &&func) {
std::forward<Func>(func)(path, false);
return Status::OK();
}
template <class Func>
Status walk_path(string &path, Func &&func) {
TRY_RESULT(fd, FileFd::open(path, FileFd::Read));
auto stat = fd.stat();
bool is_dir = stat.is_dir_;
bool is_reg = stat.is_reg_;
if (is_dir) {
return walk_path_dir(path, std::move(fd), std::forward<Func>(func));
}
fd.close();
if (is_reg) {
return walk_path_file(path, std::forward<Func>(func));
}
return Status::OK();
}
} // namespace detail
template <class Func>
Status walk_path(CSlice path, Func &&func) {
string curr_path;
curr_path.reserve(PATH_MAX + 10);
curr_path = path.c_str();
return detail::walk_path(curr_path, std::forward<Func>(func));
}
#endif
#if TD_PORT_WINDOWS
namespace detail {
template <class Func>
Status walk_path_dir(const std::wstring &dir_name, Func &&func) {
std::wstring name = dir_name + L"\\*";
WIN32_FIND_DATA file_data;
auto handle = FindFirstFileExW(name.c_str(), FindExInfoStandard, &file_data, FindExSearchNameMatch, nullptr, 0);
if (handle == INVALID_HANDLE_VALUE) {
return OS_ERROR(PSLICE() << "FindFirstFileEx" << tag("name", from_wstring(name).ok()));
}
SCOPE_EXIT {
FindClose(handle);
};
while (true) {
auto full_name = dir_name + L"\\" + file_data.cFileName;
TRY_RESULT(entry_name, from_wstring(full_name));
if (file_data.cFileName[0] != '.') {
if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
TRY_STATUS(walk_path_dir(full_name, func));
func(entry_name, true);
} else {
func(entry_name, false);
}
}
auto status = FindNextFileW(handle, &file_data);
if (status == 0) {
auto last_error = GetLastError();
if (last_error == ERROR_NO_MORE_FILES) {
return Status::OK();
}
return OS_ERROR("FindNextFileW");
}
}
}
} // namespace detail
template <class Func>
Status walk_path(CSlice path, Func &&func) {
Slice path_slice = path;
while (!path_slice.empty() && (path_slice.back() == '/' || path_slice.back() == '\\')) {
path_slice.remove_suffix(1);
}
TRY_RESULT(wpath, to_wstring(path_slice));
return detail::walk_path_dir(wpath.c_str(), func);
}
#endif
} // namespace td