/* Copyright (C) 2008  Emmanuel Varoquaux

   This file is part of XOS.

   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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */

#include "object_reference.h"

#include "xmalloc.h"

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

static void object_reference_init(struct object_reference_struct *object_reference, const char *name)
{
  object_reference->name = name;
  object_reference->object_info = NULL;
}

void object_reference_list_init(struct object_reference_list_struct *object_reference_list)
{
  object_reference_list->first = NULL;
}

void object_reference_list_destroy(struct object_reference_list_struct *object_reference_list)
{
  struct object_reference_struct *object_reference, *next_object_reference;

  for (object_reference = object_reference_list->first; object_reference; object_reference = next_object_reference) {
    next_object_reference = object_reference->next;
    free(object_reference);
  }
}

struct object_reference_struct *object_reference_list_insert(struct object_reference_list_struct *object_reference_list, const char *name)
{
  struct object_reference_struct *object_reference1, *object_reference2;

  object_reference1 = NULL;
  object_reference2 = object_reference_list->first;
  while (object_reference2) {
    if (!strcmp(object_reference2->name, name))
      return object_reference2;
    object_reference1 = object_reference2;
    object_reference2 = object_reference2->next;
  }

  object_reference2 = xmalloc(sizeof (struct object_reference_struct));
  object_reference_init(object_reference2, name);
  object_reference2->next = NULL;
  if (object_reference1)
    object_reference1->next = object_reference2;
  else
    object_reference_list->first = object_reference2;
  return object_reference2;
}