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-rw-r--r--src/FileSystem.cxx55
-rw-r--r--src/FileSystem.hxx203
2 files changed, 258 insertions, 0 deletions
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