Time tracing header.

trace.h

/*
 * Simple header for tracing time.
 * Include and define TRACE to enable.
 */
#ifndef _TRACE_H
#define _TRACE_H

#ifdef TRACE

#include <sys/time.h>
#include <stdio.h>

static struct timeval _TRACE_START;
static struct timeval _TRACE_END;
static double _TRACE_DIFF;
static char *_TRACE_MESSAGE;
static const char *_TRACE_BEGIN_FMT =
	"~~> TRACE BEGIN [%s]\n";
static const char *_TRACE_END_FMT =
	"<~~ TRACE END [%s] (%.2f ms)\n";

#define TRACE_BEGIN(message) \
	gettimeofday(&_TRACE_START, NULL); \
	_TRACE_MESSAGE = message; \
	printf(_TRACE_BEGIN_FMT, _TRACE_MESSAGE);

#define TRACE_END \
	gettimeofday(&_TRACE_END, NULL); \
	_TRACE_DIFF = (_TRACE_END.tv_sec - _TRACE_START.tv_sec) * 1000.0; \
	_TRACE_DIFF += (_TRACE_END.tv_usec - _TRACE_START.tv_usec) / 1000.0; \
	printf(_TRACE_END_FMT, _TRACE_MESSAGE, _TRACE_DIFF);
#else
#define TRACE_BEGIN
#define TRACE_END
#endif

#endif