321 lines
8.8 KiB
C++
321 lines
8.8 KiB
C++
/*
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* Copyright (C) 2007-2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/FileSystem.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/statvfs.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <wtf/EnumTraits.h>
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#include <wtf/text/CString.h>
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#include <wtf/text/StringBuilder.h>
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#include <wtf/text/WTFString.h>
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namespace WTF {
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namespace FileSystemImpl {
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PlatformFileHandle openFile(const String& path, FileOpenMode mode, FileAccessPermission permission, bool failIfFileExists)
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{
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CString fsRep = fileSystemRepresentation(path);
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if (fsRep.isNull())
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return invalidPlatformFileHandle;
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int platformFlag = 0;
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switch (mode) {
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case FileOpenMode::Read:
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platformFlag |= O_RDONLY;
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break;
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case FileOpenMode::Write:
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platformFlag |= (O_WRONLY | O_CREAT | O_TRUNC);
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break;
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case FileOpenMode::ReadWrite:
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platformFlag |= (O_RDWR | O_CREAT);
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break;
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#if OS(DARWIN)
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case FileOpenMode::EventsOnly:
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platformFlag |= O_EVTONLY;
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break;
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#endif
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}
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if (failIfFileExists)
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platformFlag |= (O_CREAT | O_EXCL);
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int permissionFlag = 0;
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if (permission == FileAccessPermission::User)
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permissionFlag |= (S_IRUSR | S_IWUSR);
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else if (permission == FileAccessPermission::All)
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permissionFlag |= (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
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return open(fsRep.data(), platformFlag, permissionFlag);
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}
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void closeFile(PlatformFileHandle& handle)
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{
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if (isHandleValid(handle)) {
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close(handle);
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handle = invalidPlatformFileHandle;
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}
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}
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long long seekFile(PlatformFileHandle handle, long long offset, FileSeekOrigin origin)
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{
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int whence = SEEK_SET;
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switch (origin) {
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case FileSeekOrigin::Beginning:
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whence = SEEK_SET;
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break;
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case FileSeekOrigin::Current:
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whence = SEEK_CUR;
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break;
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case FileSeekOrigin::End:
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whence = SEEK_END;
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break;
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default:
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ASSERT_NOT_REACHED();
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}
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return static_cast<long long>(lseek(handle, offset, whence));
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}
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bool truncateFile(PlatformFileHandle handle, long long offset)
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{
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// ftruncate returns 0 to indicate the success.
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return !ftruncate(handle, offset);
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}
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int writeToFile(PlatformFileHandle handle, const void* data, int length)
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{
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do {
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int bytesWritten = write(handle, data, static_cast<size_t>(length));
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if (bytesWritten >= 0)
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return bytesWritten;
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} while (errno == EINTR);
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return -1;
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}
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int readFromFile(PlatformFileHandle handle, void* data, int length)
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{
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do {
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int bytesRead = read(handle, data, static_cast<size_t>(length));
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if (bytesRead >= 0)
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return bytesRead;
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} while (errno == EINTR);
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return -1;
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}
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#if USE(FILE_LOCK)
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bool lockFile(PlatformFileHandle handle, OptionSet<FileLockMode> lockMode)
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{
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COMPILE_ASSERT(LOCK_SH == WTF::enumToUnderlyingType(FileLockMode::Shared), LockSharedEncodingIsAsExpected);
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COMPILE_ASSERT(LOCK_EX == WTF::enumToUnderlyingType(FileLockMode::Exclusive), LockExclusiveEncodingIsAsExpected);
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COMPILE_ASSERT(LOCK_NB == WTF::enumToUnderlyingType(FileLockMode::Nonblocking), LockNonblockingEncodingIsAsExpected);
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int result = flock(handle, lockMode.toRaw());
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return (result != -1);
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}
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bool unlockFile(PlatformFileHandle handle)
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{
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int result = flock(handle, LOCK_UN);
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return (result != -1);
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}
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#endif
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std::optional<uint64_t> fileSize(PlatformFileHandle handle)
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{
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struct stat fileInfo;
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if (fstat(handle, &fileInfo))
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return std::nullopt;
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return fileInfo.st_size;
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}
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std::optional<WallTime> fileCreationTime(const String& path)
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{
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#if OS(DARWIN) || OS(OPENBSD) || OS(NETBSD) || OS(FREEBSD)
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CString fsRep = fileSystemRepresentation(path);
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if (!fsRep.data() || fsRep.data()[0] == '\0')
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return std::nullopt;
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struct stat fileInfo;
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if (stat(fsRep.data(), &fileInfo))
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return std::nullopt;
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return WallTime::fromRawSeconds(fileInfo.st_birthtime);
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#else
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UNUSED_PARAM(path);
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return std::nullopt;
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#endif
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}
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std::optional<uint32_t> volumeFileBlockSize(const String& path)
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{
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struct statvfs fileStat;
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if (!statvfs(fileSystemRepresentation(path).data(), &fileStat))
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return fileStat.f_frsize;
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return std::nullopt;
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}
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#if !USE(CF)
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String stringFromFileSystemRepresentation(const char* path)
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{
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if (!path)
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return String();
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return String::fromUTF8(path);
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}
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CString fileSystemRepresentation(const String& path)
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{
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return path.utf8();
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}
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#endif
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#if !PLATFORM(COCOA)
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String openTemporaryFile(const String& prefix, PlatformFileHandle& handle, const String& suffix)
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{
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// FIXME: Suffix is not supported, but OK for now since the code using it is macOS-port-only.
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ASSERT_UNUSED(suffix, suffix.isEmpty());
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char buffer[PATH_MAX];
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const char* tmpDir = getenv("TMPDIR");
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if (!tmpDir)
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tmpDir = "/tmp";
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if (snprintf(buffer, PATH_MAX, "%s/%sXXXXXX", tmpDir, prefix.utf8().data()) >= PATH_MAX)
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goto end;
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handle = mkstemp(buffer);
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if (handle < 0)
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goto end;
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return String::fromUTF8(buffer);
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end:
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handle = invalidPlatformFileHandle;
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return String();
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}
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#endif // !PLATFORM(COCOA)
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std::optional<int32_t> getFileDeviceId(const CString& fsFile)
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{
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struct stat fileStat;
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if (stat(fsFile.data(), &fileStat) == -1)
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return std::nullopt;
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return fileStat.st_dev;
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}
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#if ENABLE(FILESYSTEM_POSIX_FAST_PATH)
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bool fileExists(const String& path)
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{
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return access(fileSystemRepresentation(path).data(), F_OK) != -1;
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}
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bool deleteFile(const String& path)
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{
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// unlink(...) returns 0 on successful deletion of the path and non-zero in any other case (including invalid permissions or non-existent file)
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bool unlinked = !unlink(fileSystemRepresentation(path).data());
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if (!unlinked && errno != ENOENT)
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LOG_ERROR("File failed to delete. Error message: %s", strerror(errno));
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return unlinked;
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}
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bool makeAllDirectories(const String& path)
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{
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auto fullPath = fileSystemRepresentation(path);
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if (!access(fullPath.data(), F_OK))
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return true;
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char* p = fullPath.mutableData() + 1;
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int length = fullPath.length();
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if (p[length - 1] == '/')
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p[length - 1] = '\0';
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for (; *p; ++p) {
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if (*p == '/') {
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*p = '\0';
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if (access(fullPath.data(), F_OK)) {
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if (mkdir(fullPath.data(), S_IRWXU))
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return false;
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}
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*p = '/';
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}
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}
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if (access(fullPath.data(), F_OK)) {
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if (mkdir(fullPath.data(), S_IRWXU))
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return false;
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}
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return true;
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}
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String pathByAppendingComponent(const String& path, const String& component)
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{
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if (path.endsWith('/'))
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return path + component;
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return path + "/" + component;
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}
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String pathByAppendingComponents(StringView path, const Vector<StringView>& components)
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{
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StringBuilder builder;
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builder.append(path);
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bool isFirstComponent = true;
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for (auto& component : components) {
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if (isFirstComponent) {
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isFirstComponent = false;
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if (path.endsWith('/')) {
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builder.append(component);
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continue;
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}
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}
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builder.append('/', component);
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}
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return builder.toString();
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}
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#endif
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} // namespace FileSystemImpl
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} // namespace WTF
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