many helper functions

src/InputReader.h

@@ -18,12 +18,17 @@ public:
 	bool Init(string arg_source, int num_fields, const LogField* const* fields);
     
 	void Finish();
+
+	bool Update();
 	
 protected:
     // Methods that have to be overwritten by the individual readers
 	virtual bool DoInit(string arg_source, int num_fields, const LogField* const * fields) = 0;
 	
 	virtual void DoFinish() = 0;
+
+	// update file contents to logmgr
+	virtual bool DoUpdate() = 0;
 	
 	// Reports an error to the user.
 	void Error(const char *msg);
@@ -31,6 +36,9 @@ protected:
 	// The following methods return the information as passed to Init().
 	const string Source() const	{ return source; }
 
+	// A thread-safe version of fmt(). (stolen from logwriter)
+	const char* Fmt(const char* format, ...);
+
 private:
     friend class InputMgr;
 	
@@ -44,6 +52,10 @@ private:
     bool disabled;
     
     bool Disabled() { return disabled; }
+
+	// For implementing Fmt().
+	char* buf;
+	unsigned int buf_len;    
 };