windows-server-2003/enduser/troubleshoot/bn/zstr.cpp

//+-------------------------------------------------------------------------
//
//  Microsoft Windows
//
//  Copyright (C) Microsoft Corporation, 1997 - 1997
//
//  File:       zstr.cpp
//
//--------------------------------------------------------------------------

//
//	ZSTR.CPP
//

#include <iostream>
#include <fstream>
#include <stdarg.h>
#include <stdio.h>
#include "zstr.h"

void ZSTR :: Vsprintf ( SZC szcFmt, va_list valist )
{
	//  Attempt to "sprintf" the buffer. If it fails, reallocate
	//   a larger buffer and try again.	
	UINT cbMaxNew = 0;
	char * psz = NULL;
	INT cbOut;
	do {
		delete psz;
		if ( cbMaxNew == 0 )
			cbMaxNew = 256;
		else
			cbMaxNew += cbMaxNew / 2;
		psz = new char[cbMaxNew];
	} while (  (cbOut = ::_vsnprintf( psz, cbMaxNew-1, szcFmt, valist )) < 0 ) ; 
	psz[cbOut] = 0;
	self = psz;
	delete psz;
}

void ZSTR :: Format ( SZC szcFmt, ... )
{
	va_list	valist;
	va_start( valist, szcFmt );
	
	Vsprintf( szcFmt, valist ) ;
	
	va_end( valist );
}

void ZSTR :: FormatAppend ( SZC szcFmt, ... ) 
{
	ZSTR strTemp ;
	va_list	valist;
	va_start( valist, szcFmt );
	
	strTemp.Vsprintf( szcFmt, valist ) ;
	va_end( valist );
	
	self += strTemp;
}