* Some refactoring.

src/db.hh

@@ -0,0 +1,26 @@
+#ifndef __DB_H
+#define __DB_H
+
+#include <string>
+#include <list>
+
+using namespace std;
+
+typedef pair<string, string> DBPair;
+typedef list<DBPair> DBPairs;
+
+void createDB(const string & filename, const string & dbname);
+
+bool queryDB(const string & filename, const string & dbname,
+    const string & key, string & data);
+
+void setDB(const string & filename, const string & dbname,
+    const string & key, const string & data);
+
+void delDB(const string & filename, const string & dbname,
+    const string & key);
+
+void enumDB(const string & filename, const string & dbname,
+    DBPairs & contents);
+
+#endif /* !__DB_H */