added the ASSERT and VERIFY macros to logging to help detect problems

src/log.h

@@ -8,5 +8,17 @@
 #define LDEBUG 4
 
 extern void Log(int level, const char *format, ...);
+extern void Log_assert_failed(const char *test, const char *file, int line);
+
+#define THIS_FILE __FILE__
+#define DECLARE_THIS_FILE() static const char THIS_FILE[] = __FILE__
+
+#ifdef DEBUG_ASSERT
+#define ASSERT(x)  ((x) ? (void)0 : Log_assert_failed(#x, THIS_FILE, __LINE__))
+#define VERIFY(x)  ASSERT(x)
+#else
+#define ASSERT(x)  ((void)0)
+#define VERIFY(x)  ((void)(x))
+#endif
 
 #endif /* __LOG_H_INCLUDED */