FileSystem: new library for Path-friendly file system routines

1 files changed, 55 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
+}