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/* zz30

 *

 * demonstrate a splay-tree depth problem

*/

#include <stdlib.h>

#include <stdio.h>

#include <unistd.h>

#ifndef SCALE

#define SCALE 10000

#endif

struct list

{

  struct list *next;

};

int

main ()

{

  struct list *head = NULL;

  struct list *tail = NULL;

  struct list *p;

  long n;

  int direction;

  for (direction = 0; direction < 2; direction++)

    {

      fprintf (stdout, "allocating\n");

      fflush (stdout);

      for (n = 0; n < SCALE; ++n)

        {

          p = malloc (sizeof *p);

          if (NULL == p)

            {

              fprintf (stdout, "malloc failed\n");

              break;

            }

          if (direction == 0)

            {                   /* add at tail */

              p->next = NULL;

              if (NULL != tail)

                tail->next = p;

              else

                head = p;

              tail = p;

            }

          else

            {                   /* add at head */

              p->next = head;

              if (NULL == tail)

                tail = p;

              head = p;

            }

        }

      fprintf (stdout, "freeing\n");

      fflush (stdout);

      while (NULL != head)

        {

          p = head;

          head = head->next;

          free (p);

        }

    }

  fprintf (stdout, "done\n");

  fflush (stdout);

  return (0);

}

/* { dg-output "allocating.*freeing.*allocating.*freeing.*done" } */