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 stackavail()            Return Size of Available Stack Memory

 #include   <malloc.h>                   Required for declarations only

 size_t stackavail(void);

    stackavail() returns the approximate number of bytes on the stack
    that are available for allocation.  They can be allocated by using
    alloca().

    Returns:    Approximate number of bytes available on the stack, as an
                unsigned integer.

 Portability:   Applies to MS DOS only.

   -------------------------------- Example ---------------------------------

    The following statement reports the approximate number of bytes
    available for allocation on the stack:

           #include <malloc.h>
           #include <stdio.h>      /* for printf */

           main()
           {
               printf("%u bytes of stack space available\n",
                      stackavail());
           }