97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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*/
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#pragma once
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#include "utils/Portability.h"
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#include "utils/Range.h"
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#include <sys/stat.h>
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#include <cerrno>
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#include <cstdint>
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#include <limits>
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#include <system_error>
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// A small subset of `std::filesystem`.
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// `std::filesystem` should be a drop in replacement.
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// See https://en.cppreference.com/w/cpp/filesystem for documentation.
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namespace pzstd {
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// using file_status = ... causes gcc to emit a false positive warning
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#if defined(_MSC_VER)
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typedef struct ::_stat64 file_status;
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#else
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typedef struct ::stat file_status;
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#endif
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/// https://en.cppreference.com/w/cpp/filesystem/status
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inline file_status status(StringPiece path, std::error_code& ec) noexcept {
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file_status status;
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#if defined(_MSC_VER)
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const auto error = ::_stat64(path.data(), &status);
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#else
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const auto error = ::stat(path.data(), &status);
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#endif
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if (error) {
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ec.assign(errno, std::generic_category());
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} else {
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ec.clear();
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}
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return status;
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}
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/// https://en.cppreference.com/w/cpp/filesystem/is_regular_file
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inline bool is_regular_file(file_status status) noexcept {
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#if defined(S_ISREG)
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return S_ISREG(status.st_mode);
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#elif !defined(S_ISREG) && defined(S_IFMT) && defined(S_IFREG)
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return (status.st_mode & S_IFMT) == S_IFREG;
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#else
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static_assert(false, "No POSIX stat() support.");
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#endif
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}
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/// https://en.cppreference.com/w/cpp/filesystem/is_regular_file
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inline bool is_regular_file(StringPiece path, std::error_code& ec) noexcept {
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return is_regular_file(status(path, ec));
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}
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/// https://en.cppreference.com/w/cpp/filesystem/is_directory
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inline bool is_directory(file_status status) noexcept {
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#if defined(S_ISDIR)
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return S_ISDIR(status.st_mode);
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#elif !defined(S_ISDIR) && defined(S_IFMT) && defined(S_IFDIR)
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return (status.st_mode & S_IFMT) == S_IFDIR;
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#else
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static_assert(false, "NO POSIX stat() support.");
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#endif
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}
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/// https://en.cppreference.com/w/cpp/filesystem/is_directory
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inline bool is_directory(StringPiece path, std::error_code& ec) noexcept {
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return is_directory(status(path, ec));
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}
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/// https://en.cppreference.com/w/cpp/filesystem/file_size
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inline std::uintmax_t file_size(
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StringPiece path,
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std::error_code& ec) noexcept {
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auto stat = status(path, ec);
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if (ec) {
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return std::numeric_limits<uintmax_t>::max();
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}
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if (!is_regular_file(stat)) {
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ec.assign(ENOTSUP, std::generic_category());
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return std::numeric_limits<uintmax_t>::max();
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}
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ec.clear();
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return stat.st_size;
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}
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}
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