#define trace(level, ...) vtrace(__FILE__, __func__, __LINE__, level,              __VA_ARGS__)
#define debug(...)        vtrace(__FILE__, __func__, __LINE__, TraceLevel_DEBUG,   __VA_ARGS__)
#define info(...)         vtrace(__FILE__, __func__, __LINE__, TraceLevel_INFO,    __VA_ARGS__)
#define warning(...)      vtrace(__FILE__, __func__, __LINE__, TraceLevel_WARNING, __VA_ARGS__)
#define error(...)        vtrace(__FILE__, __func__, __LINE__, TraceLevel_ERROR,   __VA_ARGS__)



enum TraceLevel {
	TraceLevel_NONE    = 1,
	TraceLevel_DEBUG   = 2,
	TraceLevel_INFO    = 3,
	TraceLevel_WARNING = 4,
	TraceLevel_ERROR   = 5,
};



void
set_level(const enum TraceLevel level);

int
vtrace(
	const char *const file,
	const char *const function,
	const int lineno,
	const enum TraceLevel level,
	const char *restrict format,
	...
);