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 heapwalk()              Walk Through the Heap

 #include   <alloc.h>

 int heapwalk(hinfo);
 struct heapinfo *hinfo;        Heap info structure.

        This function fills a heapinfo structure as follows:

               struct heapinfo
                {
                void *ptr;            // Address of this memory block.
                unsigned int size;    // Size in bytes.
                int in_use;           // In use flag.
                };

        The possible return values are:

                _HEAPOK         Heap is alright.
                _HEAPEMPTY      Heap is empty.
                _HEAPEND        End of the heap has been reached.

       Returns:     Greater than zero for success; negative otherwise.

   -------------------------------- Example ---------------------------------
        This example allocates, frees, and checks on a memory block.

    #include <stdio.h>
    #include <alloc.h>

    int main( void )
    {
       struct heapinfo hinfo;
       char *my_data;

          my_data = malloc(1000);
          free(my_data);

       hinfo.ptr = NULL;
       if(heapwalk(&hinfo) == _HEAPOK)
       printf("Heap is alright.\n");

       return 0;
    }