156 lines
2.8 KiB
C++
156 lines
2.8 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#ifndef MPD_FS_FILESYSTEM_HXX
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#define MPD_FS_FILESYSTEM_HXX
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#include "Path.hxx"
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#include "io/UniqueFileDescriptor.hxx"
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#ifdef _WIN32
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#include <fileapi.h>
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#endif
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#include <sys/stat.h>
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#include <unistd.h>
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class AllocatedPath;
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/**
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* Wrapper for open_cloexec() that uses #Path names.
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*/
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static inline UniqueFileDescriptor
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OpenFile(Path file, int flags, int mode)
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{
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UniqueFileDescriptor fd;
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(void)fd.Open(file.c_str(), flags, mode);
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return fd;
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}
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/*
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* Wrapper for rename() that uses #Path names.
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*
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* Throws std::system_error on error.
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*/
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void
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RenameFile(Path oldpath, Path newpath);
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#ifndef _WIN32
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/**
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* Wrapper for stat() that uses #Path names.
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*/
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static inline bool
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StatFile(Path file, struct stat &buf, bool follow_symlinks = true)
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{
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int ret = follow_symlinks
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? stat(file.c_str(), &buf)
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: lstat(file.c_str(), &buf);
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return ret == 0;
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}
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#endif
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static inline bool
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CreateDirectoryNoThrow(Path path) noexcept
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{
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#ifdef _WIN32
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return CreateDirectory(path.c_str(), nullptr);
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#else
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return mkdir(path.c_str(), 0777);
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#endif
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}
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/**
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* Truncate a file that exists already. Throws std::system_error on
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* error.
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*/
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void
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TruncateFile(Path path);
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/**
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* Wrapper for unlink() that uses #Path names. Throws
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* std::system_error on error.
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*/
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void
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RemoveFile(Path path);
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/**
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* Wrapper for readlink() that uses #Path names.
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*/
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AllocatedPath
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ReadLink(Path path) noexcept;
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#ifndef _WIN32
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static inline bool
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MakeFifo(Path path, mode_t mode) noexcept
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{
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return mkfifo(path.c_str(), mode) == 0;
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}
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/**
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* Wrapper for access() that uses #Path names.
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*/
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[[gnu::pure]]
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static inline bool
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CheckAccess(Path path, int mode) noexcept
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{
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return access(path.c_str(), mode) == 0;
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}
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#endif
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/**
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* Checks if #Path exists and is a regular file.
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*/
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[[gnu::pure]]
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static inline bool
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FileExists(Path path, bool follow_symlinks = true) noexcept
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{
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#ifdef _WIN32
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(void)follow_symlinks;
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const auto a = GetFileAttributes(path.c_str());
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return a != INVALID_FILE_ATTRIBUTES &&
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(a & (FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_DEVICE)) == 0;
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#else
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struct stat buf;
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return StatFile(path, buf, follow_symlinks) && S_ISREG(buf.st_mode);
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#endif
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}
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/**
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* Checks if #Path exists and is a directory.
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*/
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[[gnu::pure]]
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static inline bool
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DirectoryExists(Path path, bool follow_symlinks = true) noexcept
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{
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#ifdef _WIN32
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(void)follow_symlinks;
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const auto a = GetFileAttributes(path.c_str());
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return a != INVALID_FILE_ATTRIBUTES && (a & FILE_ATTRIBUTE_DIRECTORY);
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#else
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struct stat buf;
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return StatFile(path, buf, follow_symlinks) && S_ISDIR(buf.st_mode);
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#endif
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}
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/**
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* Checks if #Path exists.
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*/
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[[gnu::pure]]
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static inline bool
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PathExists(Path path) noexcept
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{
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#ifdef _WIN32
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return GetFileAttributes(path.c_str()) != INVALID_FILE_ATTRIBUTES;
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#else
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return CheckAccess(path, F_OK);
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#endif
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}
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#endif
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