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

#define NUM_PTRS  10
#define NUM_BYTES 16

int main(void)
{
   char *array[ NUM_PTRS ];
   int i;

   for( i = 0; i < NUM_PTRS; i++ )
      array[ i ] = (char *) malloc( NUM_BYTES );

   for( i = 0; i < NUM_PTRS; i += 2 )
      free( array[ i ] );

   for( i = 0; i < NUM_PTRS; i++ )
   {
      printf( "Node %2d ", i );
      switch( heapchecknode( array[ i ] ) )
      {
         case _HEAPEMPTY:
              printf( "No heap.\n" );
              break;
         case _HEAPCORRUPT:
              printf( "Heap corrupt.\n" );
              break;
         case _BADNODE:
              printf( "Bad node.\n" );
              break;
         case _FREEENTRY:
              printf( "Free entry.\n" );
              break;
         case _USEDENTRY:
              printf( "Used entry.\n" );
              break;
         default:
              printf( "Unknown return code.\n" );
               break;
      }
   }

   return 0;
}