nCurrentSize = _msize(__onexitbegin);
   [b]if((nCurrentSize+sizeof(_PVFV)) < ULONG(((const BYTE*)__onexitend-
      (const BYTE*)__onexitbegin)))[b]
   {
        //...
   }

        if ( _msize_crt(__onexitbegin)
                < ((unsigned)((char *)__onexitend -
            (char *)__onexitbegin) + sizeof(_PVFV)) )
        {
            /*
             * not enough room, try to grow the table
             */
            //...
        }

int __cdecl atexit(_PVFV pf)
{
   size_t nCurrentSize;

   EnterCriticalSection(&g_csInit);

   if(__onexitbegin == NULL)
   {
      __onexitbegin = (_PVFV*)malloc(16*sizeof(_PVFV));
      if(__onexitbegin == NULL)
      {
         LeaveCriticalSection(&g_csInit);
         return(-1);
      }
      __onexitend = __onexitbegin;
   }

   nCurrentSize = _msize(__onexitbegin);
   if(nCurrentSize < ULONG(((const BYTE*)__onexitend-
      (const BYTE*)__onexitbegin)) + sizeof(_PVFV))
   {
      _PVFV* pNew;

      pNew = (_PVFV*)realloc(__onexitbegin, 2*nCurrentSize);
      if(pNew == NULL)
      {
         return(-1);
      }

      __onexitbegin = pNew;
   }

   *__onexitend = pf;
   __onexitend++;

   LeaveCriticalSection(&g_csInit);

   return(0);
}