util/SplitString: new utility class

To replace g_strdup().

src/util/SplitString.hxx

@@ -0,0 +1,71 @@
+/*
+ * 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_SPLIT_STRING_HXX
+#define MPD_SPLIT_STRING_HXX
+
+#include "Compiler.h"
+
+#include <assert.h>
+
+/**
+ * Split a given constant string at a separator character.  Duplicates
+ * the first part to be able to null-terminate it.
+ */
+class SplitString {
+	char *first;
+	const char *second;
+
+public:
+	SplitString(const char *s, char separator);
+
+	~SplitString() {
+		delete[] first;
+	}
+
+	/**
+	 * Was the separator found?
+	 */
+	bool IsDefined() const {
+		return first != nullptr;
+	}
+
+	/**
+	 * Is the first part empty?
+	 */
+	bool IsEmpty() const {
+		assert(IsDefined());
+
+		return *first == 0;
+	}
+
+	const char *GetFirst() const {
+		assert(IsDefined());
+
+		return first;
+	}
+
+	const char *GetSecond() const {
+		assert(IsDefined());
+
+		return second;
+	}
+};
+
+#endif