PRODUCT  :  Borland C++                            NUMBER  :  734
  VERSION  :  2.0
       OS  :  DOS
     DATE  :  October 19, 1993                         PAGE  :  1/2

    TITLE  :  Determining Stack Size




  /************************************************************************
  NEAR MEMORY MODELS:
  In the near memory models the stack resides in the data segment.
  It begins at the end of DGROUP and grows down in memory towards
  SS & DS.  The variable __brklvl always marks the top of the heap.
  The stack is allowed to grow until SP reaches __brklvl at which
  time a stack overflow will be generated if stack checking is
  turned on else the heap will be overwritten as the stack grows.


  FAR MEMORY MODELS:
  The stack starts in high memory just prior to _heapbase and grows
  down towards SS.


  This code example shows how to check the size of the stack at run
  time.


  written by:
     Jerry Shockley    9/18/91

  ************************************************************************/
  #include <stdio.h>
  #include <conio.h>

  unsigned long stack();

  void main()
  {

     unsigned long size = stack();
     printf("\nStack size = %lu",size);
  }

  unsigned long stack()
  {
      unsigned long ret;
      extern unsigned long _heapbase;   //Beginning of the far heap
      extern  unsigned __brklvl;        //End of the near heap

      clrscr();














  PRODUCT  :  Borland C++                            NUMBER  :  734
  VERSION  :  2.0
       OS  :  DOS
     DATE  :  October 19, 1993                         PAGE  :  2/2

    TITLE  :  Determining Stack Size




  #if defined (__COMPACT__) || defined (__LARGE__) || defined
  (__HUGE__)
      ret = 16 * (*((unsigned *)_heapbase + 1) - _SS) - 16;

  #else
      ret =  *((unsigned *) _heapbase + 1 ) -  __brklvl - 1;
  #endif
     return ret;
  }

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