/* ply-array.c - linked array implementation
 *
 * Copyright (C) 2008 Red Hat, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * Written by: Ray Strode <rstrode@redhat.com>
 */
#include "config.h"
#include "ply-array.h"

#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "ply-buffer.h"

static const void *null_terminator = NULL;

struct _ply_array
{
  ply_buffer_t *buffer;
};

ply_array_t *
ply_array_new (void)
{
  ply_array_t *array;

  array = calloc (1, sizeof (ply_array_t));

  array->buffer = ply_buffer_new ();

  ply_buffer_append_bytes (array->buffer, &null_terminator, sizeof (const void *));

  return array;
}

void
ply_array_free (ply_array_t *array)
{
  if (array == NULL)
    return;

  ply_buffer_free (array->buffer);

  free (array);
}

int
ply_array_get_size (ply_array_t *array)
{
  int size;

  size = (ply_buffer_get_size (array->buffer) / sizeof (const void *)) - 1;

  return size;
}

void
ply_array_add_element (ply_array_t *array,
                       const void  *data)
{
  /* Temporarily remove NULL terminator
   */
  ply_buffer_remove_bytes_at_end (array->buffer, sizeof (const void *));

  ply_buffer_append_bytes (array->buffer, &data, sizeof (const void *));

  /* Add NULL terminator back
   */
  ply_buffer_append_bytes (array->buffer, &null_terminator, sizeof (const void *));
}

void * const *
ply_array_get_elements (ply_array_t *array)
{
  return (void * const *) ply_buffer_get_bytes (array->buffer);
}

void **
ply_array_steal_elements (ply_array_t *array)
{
  void **data;

  data = (void **) ply_buffer_steal_bytes (array->buffer);

  ply_buffer_append_bytes (array->buffer, &null_terminator, sizeof (const void *));

  return data;
}

#ifdef PLY_ARRAY_ENABLE_TEST
#include <stdio.h>

int
main (int    argc,
      char **argv)
{
  ply_array_t *array;
  int i;
  char **data;

  array = ply_array_new ();

  ply_array_add_element (array, "foo");
  ply_array_add_element (array, "bar");
  ply_array_add_element (array, "baz");
  ply_array_add_element (array, "qux");

  data = (char **) ply_array_get_elements (array);
  for (i = 0; data[i] != NULL; i++)
    {
      printf ("element '%d' has data '%s'\n", i, data[i]);
      i++;
    }

  ply_array_free (array);
  return 0;
}

#endif
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