XLog - CocoaDev

General/XLog is an alternative to General/NSLog if you think General/NSLog’s header is wide or you would like to log the elapsed time from a previous log.

General/XLog.h

extern void General/XLog(General/NSString *format, …); extern void General/XFTimeLog(General/CFAbsoluteTime *time, General/NSString *format, …);

General/XLog.m

void _XLog(General/CFAbsoluteTime *lastTime, General/NSString *format, va_list argList) {

General/CFAbsoluteTime time = General/CFAbsoluteTimeGetCurrent();
static unsigned logcount = 0;
if (logcount++ % 100 == 0) General/NSLog(@"logcount: %i", logcount);
static General/CFTimeZoneRef zone = nil;
if (!zone) zone = General/CFTimeZoneCopyDefault();

General/CFGregorianDate date = General/CFAbsoluteTimeGetGregorianDate(time, zone);
if (lastTime) {
	double elapsed_time = time - *lastTime;
	unsigned total_sec = elapsed_time;
	double fraction = elapsed_time - (double)total_sec;
	unsigned milli = fraction * 1000.0f;
	unsigned micro = fraction * 1000000.0f;
	micro %= 1000;
	// log elapsed time [sec.ms_us|pid]
	printf("[%03i.%03i_%03i|%i] ", total_sec, milli, micro, getpid());
} else {
	unsigned sec = date.second;
	double fraction = date.second - (double)sec;
	unsigned milli = fraction * 1000.0f;
	// log standard time [hours:min:sec.ms|pid]
	printf("[%02i:%02i:%02i.%03i|%i] ", date.hour, date.minute, sec, milli, getpid());
}

General/CFStringRef log = General/CFStringCreateWithFormatAndArguments(NULL, NULL, (General/CFStringRef)format, argList);
char *ptr = (char *)General/CFStringGetCStringPtr(log, kCFStringEncodingUTF8);
if (ptr) 	
	printf("%s\n", ptr);
else {
	unsigned buflen = General/CFStringGetLength(log) * 4;
	ptr = malloc(buflen);
	if (General/CFStringGetCString(log, ptr, buflen, kCFStringEncodingUTF8));
		printf("%s\n", ptr);
	free(ptr);
}
General/CFRelease(log);

}

void General/XLog(General/NSString *format, …) {

va_list argList;
va_start(argList, format);
_XLog(nil, format, argList);
va_end(argList);

}

void General/XFTimeLog(General/CFAbsoluteTime *time, General/NSString *format, …) {

va_list argList;
va_start(argList, format);
_XLog(time, format, argList);
va_end(argList);

if (time) *time = General/CFAbsoluteTimeGetCurrent();

}

So something like this

static void test(void) {

General/XLog(@"test");

General/CFAbsoluteTime time = General/CFAbsoluteTimeGetCurrent();
int i;
for (i = 0; i < 5; i++) {
	sleep(1);
	General/XFTimeLog(&time, @"loop[%i]", i);
}

}

will log this

–zootbobbalu