SULog.m

/*
 *  SULog.m
 *  EyeTV
 *
 *  Created by Uli Kusterer on 12/03/2009.
 *  Copyright 2009 Elgato Systems GmbH. All rights reserved.
 *
 */

// -----------------------------------------------------------------------------
//	Headers:
// -----------------------------------------------------------------------------

#include "SULog.h"


// -----------------------------------------------------------------------------
//	Constants:
// -----------------------------------------------------------------------------

#define LOG_FILE_PATH	@"~/Library/Logs/SparkleUpdateLog.log"


// -----------------------------------------------------------------------------
//	SUClearLog:
//		Erase the log at the start of an update. We don't want to litter the
//		user's hard disk with logging data that's mostly unused, so each app
//		should clear the log before it starts updating, so only the most recent
//		update is kept around.
//
//	TAKES:
//		sender	-	Object that sent this message, typically of type X.
//
//	GIVES:
//		param	-	who owns the returned value?
//		result	-	same here.
// -----------------------------------------------------------------------------

void	SUClearLog( void )
{
	FILE*		logfile = fopen([[LOG_FILE_PATH stringByExpandingTildeInPath] fileSystemRepresentation],"w");
	if( logfile )
		fclose(logfile);
	else
		NSLog(@"----- Sparkle Log -----");
}


// -----------------------------------------------------------------------------
//	SULog:
//		Like NSLog, but logs to one specific log file. Each line is prefixed
//		with the current date and time, to help in regressing issues.
//
//	TAKES:
//		format	-	NSLog/printf-style format string.
//		...		-	More parameters depending on format string's contents.
// -----------------------------------------------------------------------------

void	SULog( NSString* format, ... )
{
	va_list ap;
	va_start(ap, format);
	NSString*	theStr = [[NSString alloc] initWithFormat: format arguments: ap];
	FILE*		logfile = fopen([[LOG_FILE_PATH stringByExpandingTildeInPath] fileSystemRepresentation],"a");
	if( !logfile )
		NSLog( @"%@",theStr );
	else
	{
		theStr = [NSString stringWithFormat: @"%@: %@", [NSDate date], theStr];
		NSData*		theData = [theStr dataUsingEncoding: NSUTF8StringEncoding];
		char		newlineChar = '\n';
		fwrite( [theData bytes], 1, [theData length], logfile );
		fwrite( &newlineChar, 1, 1, logfile );	// Append a newline.
		fclose( logfile );
		logfile = NULL;
	}
	va_end(ap);
}