How to get stack size programatically

How do get the size of the stack of my application from program code.  Unless a different value is specified via the /STACK statement on the command line of the linker, or the STACK statement in a program's .DEF file, the stack size of a Windows program is 1 megabyte.  How do I get this value from inside of the C++ program, short of reading the PE header.
ShrifAsked:
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byangCommented:
Why do you need to know this ?
Well, I can think of one way to do this: get a pointer to a local variable, then move this pointer downward (ptr--) and use IsBadReadPtr() on it. Eventually you'll hit the stack guard page and IsBadReadPtr() will return non-zero. This will give you the bottom of the stack. Use the same approach to get the top address of the stack.
Of course, you can add/substract page size to the pointer for better performance.
I don't know if this has the effect of commiting physical memory to your entire stack range.
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ShrifAuthor Commented:
I am sorry but, I really think there's a better answer.  This information should be available somewhere in the system.In answer to your question, I need to know this so that I can check for stack-overflows in recursive calls.  I have a built-in scripting engine in my program.  This software is maintained by a number of people so I really don't want to hard code 1-meg in my code.  Someone later may change the stack to be smaller for for whatever reason, and not change my hard coded number in C++
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byangCommented:
OK, let's go assembly:

  DWORD dwStackSize; //size of current thread's stack
  _asm {
       mov eax,fs:[4]
       sub eax,fs:[8]
       mov dwStackSize,eax
  }

Don't know how to do this on non-intel CPU's.  
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