Minor logging improvements.

TNC/Log.cpp

@@ -2,6 +2,8 @@
 // All rights reserved.
 
 #include <Log.h>
+#include <cstdarg>
+#include <cstdio>
 
 void log_(int level, const char* fmt, ...)
 {

TNC/Log.h

@@ -20,12 +20,19 @@ extern "C" {
 
 void log_(int level, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
 
+#ifndef KISS_LOG_LEVEL
+#define KISS_LOG_LEVEL 0
+#endif
+
 #ifdef KISS_LOGGING
-#define DEBUG(...)    log_(0, __VA_ARGS__)
-#define INFO(...)     log_(1, __VA_ARGS__)
-#define WARN(...)     log_(2, __VA_ARGS__)
-#define ERROR(...)    log_(3, __VA_ARGS__)
-#define SEVERE(...)   log_(4, __VA_ARGS__)
+
+#define LOG(level, ...) if(level >= KISS_LOG_LEVEL) log_(level, __VA_ARGS__);
+
+#define DEBUG(...)    LOG(0, __VA_ARGS__)
+#define INFO(...)     LOG(1, __VA_ARGS__)
+#define WARN(...)     LOG(2, __VA_ARGS__)
+#define ERROR(...)    LOG(3, __VA_ARGS__)
+#define SEVERE(...)   LOG(4, __VA_ARGS__)
 #else
 #define DEBUG(...)
 #define INFO(...)