/* Hash table for sequential list, set, and map data type.

   Copyright (C) 2006, 2009-2023 Free Software Foundation, Inc.

   Written by Bruno Haible <bruno@clisp.org>, 2006.

   This file is free software: you can redistribute it and/or modify

   it under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation; either version 2.1 of the

   License, or (at your option) any later version.

   This file is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License

   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Common code of

   gl_linkedhash_list.c, gl_avltreehash_list.c, gl_rbtreehash_list.c,

   gl_linkedhash_set.c, gl_hash_set.c,

   gl_linkedhash_map.c, gl_hash_map.c.  */

#include "gl_anyhash_primes.h"

/* Resizes the hash table with a new estimated size.  */

static void

hash_resize (CONTAINER_T container, size_t estimate)

{

  size_t new_size = next_prime (estimate);

  if (new_size > container->table_size)

    {

      gl_hash_entry_t *old_table = container->table;

      /* Allocate the new table.  */

      gl_hash_entry_t *new_table;

      size_t i;

      if (size_overflow_p (xtimes (new_size, sizeof (gl_hash_entry_t))))

        goto fail;

      new_table =

        (gl_hash_entry_t *) calloc (new_size, sizeof (gl_hash_entry_t));

      if (new_table == NULL)

        goto fail;

      /* Iterate through the entries of the old table.  */

      for (i = container->table_size; i > 0; )

        {

          gl_hash_entry_t node = old_table[--i];

          while (node != NULL)

            {

              gl_hash_entry_t next = node->hash_next;

              /* Add the entry to the new table.  */

              size_t bucket = node->hashcode % new_size;

              node->hash_next = new_table[bucket];

              new_table[bucket] = node;

              node = next;

            }

        }

      container->table = new_table;

      container->table_size = new_size;

      free (old_table);

    }

  return;

 fail:

  /* Just continue without resizing the table.  */

  return;

}

/* Resizes the hash table if needed, after CONTAINER_COUNT (container) was

   incremented.  */

static void

hash_resize_after_add (CONTAINER_T container)

{

  size_t count = CONTAINER_COUNT (container);

  size_t estimate = xsum (count, count / 2); /* 1.5 * count */

  if (estimate > container->table_size)

    hash_resize (container, estimate);

}