FORMAT.CPP

// ----------------------------------------------------------------------------- 
// Format.cpp: Implements functions to format and return CStrings. 
// 
// Copyright (C) Microsoft Corp. 1986-1996.  All Rights Reserved. 
//---------------------------------------------------------------------------- 
 
#include "edkafx.h" 
#include "exadmin.h" 
#include "format.h" 
 
const int MAX_RESOURCE_MSG = 500; 
 
//---------------------------------------------------------------------------- 
// These integers control the size of the buffer we allocate for the  
// _vsnprintf() function call.  It grows when _vsnprintf() returns an 
// error.  The effect is that we remember the largest buffer needed for 
// string formating and always start off by allocating that size of buffer. 
// This provides a safe string formating method. 
//---------------------------------------------------------------------------- 
 
static int nLargestBuf = 256;   
static int nGrowSize = 128; 
 
//---------------------------------------------------------------------------- 
// Takes arguments just like vprintf(), but returns the result in a CString. 
// This performs a safe format with no overwrites. 
//---------------------------------------------------------------------------- 
 
CString _Format( TCHAR *pFmt, va_list pVArg) 
{ 
    CString sFmtBuf; 
 
    for( ;;) 
    {   // Take a shot at formating the string. 
        TCHAR* pFmtBuf = sFmtBuf.GetBuffer( nLargestBuf); 
        if( _vsntprintf( pFmtBuf, nLargestBuf, pFmt, pVArg) >= 0) 
           break;   // Format was successful. 
             
        // Buffer was not big enough so enlarge it. 
        nLargestBuf += nGrowSize; 
        nGrowSize = (int) (nGrowSize * 3 / 2); 
    } 
    sFmtBuf.ReleaseBuffer(); 
    return( sFmtBuf); 
} 
 
//---------------------------------------------------------------------------- 
// Takes arguments just like printf(), but returns the result in a CString. 
//---------------------------------------------------------------------------- 
 
CString Format( TCHAR *pMsgFmt ...) 
{ 
    va_list pVArg; 
    va_start( pVArg, pMsgFmt); 
    return( _Format( pMsgFmt, pVArg)); 
} 
 
//---------------------------------------------------------------------------- 
// Find a format string in the resource and use it to format the CString. 
//---------------------------------------------------------------------------- 
 
CString _FormatResource( int hResStr, va_list pVArg) 
{ 
    TCHAR sMsgFmt[ MAX_RESOURCE_MSG];    // Arbitrary size that should be big enough. 
 
    if( CAdminDialog::LoadStringA( hResStr, sMsgFmt, sizeof( sMsgFmt)) == 0) 
        return( Format( "Unknown error %d m_bOccurred.", hResStr)); 
    else 
        return( _Format( sMsgFmt, pVArg)); 
} 
 
//---------------------------------------------------------------------------- 
// Find a format string in the resource and use it to format the CString. 
//---------------------------------------------------------------------------- 
 
CString FormatResource( int hResStr ...) 
{ 
    va_list pVArg; 
    va_start( pVArg, hResStr); 
    return( _FormatResource( hResStr, pVArg)); 
} 
 
//----------------------------------------------------------------------------