glib/gobject/gvaluearray.c

/* GObject - GLib Type, Object, Parameter and Signal Library
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * 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	"gvaluearray.h"
#include	<string.h>
#include	<stdlib.h>	/* qsort() */

#ifdef	DISABLE_MEM_POOLS
#  define	GROUP_N_VALUES	(1)	/* power of 2 !! */
#else
#  define	GROUP_N_VALUES	(8)	/* power of 2 !! */
#endif


/* --- functions --- */
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
}

GValueArray*
g_value_array_new (guint n_prealloced)
{
  GValueArray *value_array = g_new (GValueArray, 1);

  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;
}

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_free (value_array);
}

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_new (GValueArray, 1);
  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;
}

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);
}

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);
}

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;
}

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;
}

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;
}

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;
}