Check printf format string and arguments

Author: emontnemery

hardware/EvohomeBase.h

@@ -516,7 +516,11 @@ class CEvohomeBase : public CDomoticzHardwareBase
 	static const char* GetZoneModeName(uint8_t nZoneMode);
 
 	static void LogDate();
-	static void Log(bool bDebug, int nLogLevel, const char* format, ... );
+	static void Log(bool bDebug, int nLogLevel, const char* format, ... )
+#ifdef __GNUC__
+		__attribute__ ((format (printf, 3, 4)))
+#endif
+		;
 	static void Log(const char *szMsg, CEvohomeMsg &msg);
 
 private:

main/Logger.h

@@ -62,10 +62,17 @@ class CLogger
 	void SetOutputFile(const char *OutputFile);
 
 	void Log(const _eLogLevel level, const std::string& sLogline);
-	void Log(const _eLogLevel level, const char* logline, ...);
+	void Log(const _eLogLevel level, const char* logline, ...)
+#ifdef __GNUC__
+		__attribute__ ((format (printf, 3, 4)))
+#endif
+	;
 	void Debug(const _eDebugLevel level, const std::string& sLogline);
-	void Debug(const _eDebugLevel level, const char* logline, ...);
-
+	void Debug(const _eDebugLevel level, const char* logline, ...)
+#ifdef __GNUC__
+		__attribute__ ((format (printf, 3, 4)))
+#endif
+	;
 	void LogSequenceStart();
 	void LogSequenceAdd(const char* logline);
 	void LogSequenceAddNoLF(const char* logline);