diff options
| -rw-r--r-- | Makefile.am | 1 | ||||
| -rw-r--r-- | src/FileSystem.cxx | 55 | ||||
| -rw-r--r-- | src/FileSystem.hxx | 203 |
3 files changed, 259 insertions, 0 deletions
diff --git a/Makefile.am b/Makefile.am index 8674ca5c2..19349af86 100644 --- a/Makefile.am +++ b/Makefile.am @@ -297,6 +297,7 @@ src_mpd_SOURCES = \ src/Volume.cxx src/Volume.hxx \ src/SongFilter.cxx src/SongFilter.hxx \ src/PlaylistFile.cxx src/PlaylistFile.hxx \ + src/FileSystem.cxx src/FileSystem.hxx \ src/timer.c # diff --git a/src/FileSystem.cxx b/src/FileSystem.cxx new file mode 100644 index 000000000..70d0d71bb --- /dev/null +++ b/src/FileSystem.cxx @@ -0,0 +1,55 @@ +/* + * Copyright (C) 2003-2013 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "FileSystem.hxx" + +#include <errno.h> + +bool ReadLink(const Path &path, Path &result) +{ +#ifdef WIN32 + (void)path; + result = Path::Null(); + errno = EINVAL; + return false; +#else + char buffer[MPD_PATH_MAX]; + ssize_t size = readlink(path.c_str(), buffer, MPD_PATH_MAX); + int orig_errno = errno; + if (size < 0) { + result = Path::Null(); + errno = orig_errno; + return false; + } + if (size >= MPD_PATH_MAX) { + result = Path::Null(); + errno = ENOMEM; + return false; + } + buffer[size] = '\0'; + result = Path::FromFS(buffer); + if (result.IsNull()) { + errno = ENOMEM; + return false; + } + errno = orig_errno; + return true; +#endif +} diff --git a/src/FileSystem.hxx b/src/FileSystem.hxx new file mode 100644 index 000000000..cf0fe4bbf --- /dev/null +++ b/src/FileSystem.hxx @@ -0,0 +1,203 @@ +/* + * Copyright (C) 2003-2013 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef MPD_FILESYSTEM_HXX +#define MPD_FILESYSTEM_HXX + +#include "check.h" +#include "fd_util.h" + +#include "Path.hxx" + +#include <sys/stat.h> +#include <dirent.h> +#include <unistd.h> +#include <assert.h> +#include <stdio.h> + +namespace FOpenMode { +/** + * Open mode for reading text files. + */ +constexpr Path::const_pointer ReadText = "r"; + +/** + * Open mode for reading binary files. + */ +constexpr Path::const_pointer ReadBinary = "rb"; + +/** + * Open mode for writing text files. + */ +constexpr Path::const_pointer WriteText = "w"; + +/** + * Open mode for writing binary files. + */ +constexpr Path::const_pointer WriteBinary = "wb"; +} + +/** + * Wrapper for fopen() that uses #Path names. + */ +static inline FILE *FOpen(const Path &file, Path::const_pointer mode) +{ + return fopen(file.c_str(), mode); +} + +/** + * Wrapper for open_cloexec() that uses #Path names. + */ +static inline int OpenFile(const Path &file, int flags, int mode) +{ + return open_cloexec(file.c_str(), flags, mode); +} + +/** + * Wrapper for rename() that uses #Path names. + */ +static inline int RenameFile(const Path &oldpath, const Path &newpath) +{ + return rename(oldpath.c_str(), newpath.c_str()); +} + +/** + * Wrapper for stat() that uses #Path names. + */ +static inline int StatFile(const Path &file, struct stat &buf) +{ + return stat(file.c_str(), &buf); +} + +/** + * Wrapper for unlink() that uses #Path names. + */ +static inline int UnlinkFile(const Path &file) +{ + return unlink(file.c_str()); +} + +/** + * Wrapper for readlink() that uses #Path names. + * Unlike readlink() it returns true on success and false otherwise. + * Use errno to get error code. + */ +bool ReadLink(const Path &path, Path &result); + +/** + * Wrapper for access() that uses #Path names. + */ +static inline int CheckAccess(const Path &path, int mode) +{ +#ifdef WIN32 + (void)path; + (void)mode; + return 0; +#else + return access(path.c_str(), mode); +#endif +} + +/** + * Checks if #Path is a regular file. + */ +static inline bool CheckIsRegular(const Path &path) +{ + struct stat buf; + return StatFile(path, buf) == 0 && S_ISREG(buf.st_mode); +} + +/** + * Checks if #Path is a directory. + */ +static inline bool CheckIsDirectory(const Path &path) +{ + struct stat buf; + return StatFile(path, buf) == 0 && S_ISDIR(buf.st_mode); +} + +/** + * Checks if #Path exists. + */ +static inline bool CheckExists(const Path &path) +{ + struct stat buf; + return StatFile(path, buf) == 0; +} + +/** + * Reader for directory entries. + */ +class DirectoryReader { + DIR *const dirp; + dirent *ent; +public: + /** + * Creates new directory reader for the specified #dir. + */ + explicit DirectoryReader(const Path &dir) + : dirp(opendir(dir.c_str())), + ent(nullptr) { + } + + DirectoryReader(const DirectoryReader &other) = delete; + DirectoryReader &operator=(const DirectoryReader &other) = delete; + + /** + * Destroys this instance. + */ + ~DirectoryReader() { + if (!Failed()) + closedir(dirp); + } + + /** + * Checks if directory failed to open. + */ + bool Failed() const { + return dirp == nullptr; + } + + /** + * Checks if directory entry is available. + */ + bool HasEntry() const { + assert(!Failed()); + return ent != nullptr; + } + + /** + * Reads next directory entry. + */ + bool ReadEntry() { + assert(!Failed()); + ent = readdir(dirp); + return HasEntry(); + } + + /** + * Extracts directory entry that was previously read by #ReadEntry. + */ + Path GetEntry() const { + assert(HasEntry()); + return Path::FromFS(ent->d_name); + } +}; + +#endif |