/* GObject - GLib Type, Object, Parameter and Signal Library

 * Copyright (C) 2001 Red Hat, Inc.

 * Portions copyright (c) 2006-2009 Nokia Corporation.  All rights reserved.

 *

 * This library 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 of the License, or (at your option) any later version.

 *

 * This library 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 library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,

 * Boston, MA 02111-1307, USA.

 */

/*

 * MT safe

 */

#include "config.h"

#include <string.h>

#include <stdlib.h>  /* qsort() */

#include "gvaluearray.h"

#include "gobjectalias.h"

/**

 * SECTION:value_arrays

 * @short_description: A container structure to maintain an array of

 *     generic values

 * @see_also: #GValue, #GParamSpecValueArray, g_param_spec_value_array()

 * @title: Value arrays

 *

 * The prime purpose of a #GValueArray is for it to be used as an

 * object property that holds an array of values. A #GValueArray wraps

 * an array of #GValue elements in order for it to be used as a boxed

 * type through %G_TYPE_VALUE_ARRAY.

 */

#ifdef	DISABLE_MEM_POOLS

#  define	GROUP_N_VALUES	(1)	/* power of 2 !! */

#else

#  define	GROUP_N_VALUES	(8)	/* power of 2 !! */

#endif

/* --- functions --- */

/**

 * g_value_array_get_nth:

 * @value_array: #GValueArray to get a value from

 * @index_: index of the value of interest

 *

 * Return a pointer to the value at @index_ containd in @value_array.

 *

 * Returns: pointer to a value at @index_ in @value_array

 */

EXPORT_C GValue*

g_value_array_get_nth (GValueArray *value_array,

		       guint        index)

{

  g_return_val_if_fail (value_array != NULL, NULL);

  g_return_val_if_fail (index < value_array->n_values, NULL);

  return value_array->values + index;

}

static inline void

value_array_grow (GValueArray *value_array,

		  guint        n_values,

		  gboolean     zero_init)

{

  g_return_if_fail (n_values >= value_array->n_values);

  value_array->n_values = n_values;

  if (value_array->n_values > value_array->n_prealloced)

    {

      guint i = value_array->n_prealloced;

      value_array->n_prealloced = (value_array->n_values + GROUP_N_VALUES - 1) & ~(GROUP_N_VALUES - 1);

      value_array->values = g_renew (GValue, value_array->values, value_array->n_prealloced);

      if (!zero_init)

	i = value_array->n_values;

      memset (value_array->values + i, 0,

	      (value_array->n_prealloced - i) * sizeof (value_array->values[0]));

    }

}

static inline void

value_array_shrink (GValueArray *value_array)

{

#ifdef  DISABLE_MEM_POOLS

  if (value_array->n_prealloced >= value_array->n_values + GROUP_N_VALUES)

    {

      value_array->n_prealloced = (value_array->n_values + GROUP_N_VALUES - 1) & ~(GROUP_N_VALUES - 1);

      value_array->values = g_renew (GValue, value_array->values, value_array->n_prealloced);

    }

#endif

}

/**

 * g_value_array_new:

 * @n_prealloced: number of values to preallocate space for

 *

 * Allocate and initialize a new #GValueArray, optionally preserve space

 * for @n_prealloced elements. New arrays always contain 0 elements,

 * regardless of the value of @n_prealloced.

 *

 * Returns: a newly allocated #GValueArray with 0 values

 */

EXPORT_C GValueArray*

g_value_array_new (guint n_prealloced)

{

  GValueArray *value_array = g_slice_new (GValueArray);

  value_array->n_values = 0;

  value_array->n_prealloced = 0;

  value_array->values = NULL;

  value_array_grow (value_array, n_prealloced, TRUE);

  value_array->n_values = 0;

  return value_array;

}

/**

 * g_value_array_free:

 * @value_array: #GValueArray to free

 *

 * Free a #GValueArray including its contents.

 */

EXPORT_C void

g_value_array_free (GValueArray *value_array)

{

  guint i;

  g_return_if_fail (value_array != NULL);

  for (i = 0; i < value_array->n_values; i++)

    {

      GValue *value = value_array->values + i;

      if (G_VALUE_TYPE (value) != 0) /* we allow unset values in the array */

	g_value_unset (value);

    }

  g_free (value_array->values);

  g_slice_free (GValueArray, value_array);

}

/**

 * g_value_array_copy:

 * @value_array: #GValueArray to copy

 *

 * Construct an exact copy of a #GValueArray by duplicating all its

 * contents.

 *

 * Returns: Newly allocated copy of #GValueArray

 */

EXPORT_C GValueArray*

g_value_array_copy (const GValueArray *value_array)

{

  GValueArray *new_array;

  guint i;

  g_return_val_if_fail (value_array != NULL, NULL);

  new_array = g_slice_new (GValueArray);

  new_array->n_values = 0;

  new_array->values = NULL;

  new_array->n_prealloced = 0;

  value_array_grow (new_array, value_array->n_values, TRUE);

  for (i = 0; i < new_array->n_values; i++)

    if (G_VALUE_TYPE (value_array->values + i) != 0)

      {

	GValue *value = new_array->values + i;

	g_value_init (value, G_VALUE_TYPE (value_array->values + i));

	g_value_copy (value_array->values + i, value);

      }

  return new_array;

}

/**

 * g_value_array_prepend:

 * @value_array: #GValueArray to add an element to

 * @value: #GValue to copy into #GValueArray

 *

 * Insert a copy of @value as first element of @value_array.

 *

 * Returns: the #GValueArray passed in as @value_array

 */

EXPORT_C GValueArray*

g_value_array_prepend (GValueArray  *value_array,

		       const GValue *value)

{

  g_return_val_if_fail (value_array != NULL, NULL);

  return g_value_array_insert (value_array, 0, value);

}

/**

 * g_value_array_append:

 * @value_array: #GValueArray to add an element to

 * @value: #GValue to copy into #GValueArray

 *

 * Insert a copy of @value as last element of @value_array.

 *

 * Returns: the #GValueArray passed in as @value_array

 */

EXPORT_C GValueArray*

g_value_array_append (GValueArray  *value_array,

		      const GValue *value)

{

  g_return_val_if_fail (value_array != NULL, NULL);

  return g_value_array_insert (value_array, value_array->n_values, value);

}

/**

 * g_value_array_insert:

 * @value_array: #GValueArray to add an element to

 * @index_: insertion position, must be <= value_array->n_values

 * @value: #GValue to copy into #GValueArray

 *

 * Insert a copy of @value at specified position into @value_array.

 *

 * Returns: the #GValueArray passed in as @value_array

 */

EXPORT_C GValueArray*

g_value_array_insert (GValueArray  *value_array,

		      guint         index,

		      const GValue *value)

{

  guint i;

  g_return_val_if_fail (value_array != NULL, NULL);

  g_return_val_if_fail (index <= value_array->n_values, value_array);

  /* we support NULL for "value" as a shortcut for an unset value */

  i = value_array->n_values;

  value_array_grow (value_array, value_array->n_values + 1, FALSE);

  if (index + 1 < value_array->n_values)

    g_memmove (value_array->values + index + 1, value_array->values + index,

	       (i - index) * sizeof (value_array->values[0]));

  memset (value_array->values + index, 0, sizeof (value_array->values[0]));

  if (value)

    {

      g_value_init (value_array->values + index, G_VALUE_TYPE (value));

      g_value_copy (value, value_array->values + index);

    }

  return value_array;

}

/**

 * g_value_array_remove:

 * @value_array: #GValueArray to remove an element from

 * @index_: position of value to remove, must be < value_array->n_values

 *

 * Remove the value at position @index_ from @value_array.

 *

 * Returns: the #GValueArray passed in as @value_array

 */

EXPORT_C GValueArray*

g_value_array_remove (GValueArray *value_array,

		      guint        index)

{

  g_return_val_if_fail (value_array != NULL, NULL);

  g_return_val_if_fail (index < value_array->n_values, value_array);

  if (G_VALUE_TYPE (value_array->values + index) != 0)

    g_value_unset (value_array->values + index);

  value_array->n_values--;

  if (index < value_array->n_values)

    g_memmove (value_array->values + index, value_array->values + index + 1,

	       (value_array->n_values - index) * sizeof (value_array->values[0]));

  value_array_shrink (value_array);

  if (value_array->n_prealloced > value_array->n_values)

    memset (value_array->values + value_array->n_values, 0, sizeof (value_array->values[0]));

  return value_array;

}

/**

 * g_value_array_sort:

 * @value_array: #GValueArray to sort

 * @compare_func: function to compare elements

 *

 * Sort @value_array using @compare_func to compare the elements accoring to

 * the semantics of #GCompareFunc.

 *

 * The current implementation uses Quick-Sort as sorting algorithm.

 *

 * Returns: the #GValueArray passed in as @value_array

 */

EXPORT_C GValueArray*

g_value_array_sort (GValueArray *value_array,

		    GCompareFunc compare_func)

{

  g_return_val_if_fail (compare_func != NULL, NULL);

  if (value_array->n_values)

    qsort (value_array->values,

	   value_array->n_values,

	   sizeof (value_array->values[0]),

	   compare_func);

  return value_array;

}

/**

 * g_value_array_sort_with_data:

 * @value_array: #GValueArray to sort

 * @compare_func: function to compare elements

 * @user_data: extra data argument provided for @compare_func

 *

 * Sort @value_array using @compare_func to compare the elements accoring

 * to the semantics of #GCompareDataFunc.

 *

 * The current implementation uses Quick-Sort as sorting algorithm.

 *

 * Returns: the #GValueArray passed in as @value_array

 */

EXPORT_C GValueArray*

g_value_array_sort_with_data (GValueArray     *value_array,

			      GCompareDataFunc compare_func,

			      gpointer         user_data)

{

  g_return_val_if_fail (value_array != NULL, NULL);

  g_return_val_if_fail (compare_func != NULL, NULL);

  if (value_array->n_values)

    g_qsort_with_data (value_array->values,

		       value_array->n_values,

		       sizeof (value_array->values[0]),

		       compare_func, user_data);

  return value_array;

}

#define __G_VALUE_ARRAY_C__

#include "gobjectaliasdef.c"