headers/jslist.h

/*
    Based on gslist.c from glib-1.2.9 (LGPL).
 
    Adaption to JACK, Copyright (C) 2002 Kai Vehmanen.
      - replaced use of gtypes with normal ANSI C types
      - glib's memery allocation routines replaced with
        malloc/free calls

    This program 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 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 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, write to the Free Software 
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

*/

#ifndef __jack_jslist_h__
#define __jack_jslist_h__

#include <stdlib.h>

typedef struct _JSList JSList;

typedef int		(*JCompareFunc)		(void*	a,
						 void*	b);
struct _JSList
{
  void *data;
  JSList *next;
};

static __inline__
JSList*
jack_slist_alloc (void)
{
  JSList *new_list;

  new_list = (JSList*)malloc(sizeof(JSList));
  new_list->data = NULL;
  new_list->next = NULL;

  return new_list;
}

static __inline__ 
JSList*
jack_slist_prepend (JSList   *list,
		    void     *data)
{
  JSList *new_list;

  new_list = (JSList*)malloc(sizeof(JSList));
  new_list->data = data;
  new_list->next = list;

  return new_list;
}

#define jack_slist_next(slist)	((slist) ? (((JSList *)(slist))->next) : NULL)
static __inline__ 
JSList*
jack_slist_last (JSList *list)
{
  if (list)
    {
      while (list->next)
	list = list->next;
    }

  return list;
}

static __inline__ 
JSList*
jack_slist_remove_link (JSList *list,
		     JSList *link)
{
  JSList *tmp;
  JSList *prev;

  prev = NULL;
  tmp = list;

  while (tmp)
    {
      if (tmp == link)
	{
	  if (prev)
	    prev->next = tmp->next;
	  if (list == tmp)
	    list = list->next;

	  tmp->next = NULL;
	  break;
	}

      prev = tmp;
      tmp = tmp->next;
    }

  return list;
}

static __inline__ 
void
jack_slist_free (JSList *list)
{
  while (list)
    {
	    JSList *next = list->next;
	    free(list);
	    list = next;
    }
}

static __inline__ 
void
jack_slist_free_1 (JSList *list)
{
  if (list)
    {
      free(list);
    }
}

static __inline__ 
JSList*
jack_slist_remove (JSList   *list,
		   void     *data)
{
  JSList *tmp;
  JSList *prev;

  prev = NULL;
  tmp = list;

  while (tmp)
    {
      if (tmp->data == data)
	{
	  if (prev)
	    prev->next = tmp->next;
	  if (list == tmp)
	    list = list->next;

	  tmp->next = NULL;
	  jack_slist_free (tmp);

	  break;
	}

      prev = tmp;
      tmp = tmp->next;
    }

  return list;
}

static __inline__ 
unsigned int
jack_slist_length (JSList *list)
{
  unsigned int length;

  length = 0;
  while (list)
    {
      length++;
      list = list->next;
    }

  return length;
}

static __inline__ 
JSList*
jack_slist_find (JSList   *list,
		 void     *data)
{
  while (list)
    {
      if (list->data == data)
	break;
      list = list->next;
    }

  return list;
}

static __inline__ 
JSList*
jack_slist_copy (JSList *list)
{
  JSList *new_list = NULL;

  if (list)
    {
      JSList *last;

      new_list = jack_slist_alloc ();
      new_list->data = list->data;
      last = new_list;
      list = list->next;
      while (list)
	{
	  last->next = jack_slist_alloc ();
	  last = last->next;
	  last->data = list->data;
	  list = list->next;
	}
    }

  return new_list;
}

static __inline__ 
JSList*
jack_slist_append (JSList   *list,
		   void     *data)
{
  JSList *new_list;
  JSList *last;

  new_list = jack_slist_alloc ();
  new_list->data = data;

  if (list)
    {
      last = jack_slist_last (list);
      last->next = new_list;

      return list;
    }
  else
      return new_list;
}

static __inline__ 
JSList* 
jack_slist_sort_merge  (JSList      *l1, 
			JSList      *l2,
			JCompareFunc compare_func)
{
  JSList list, *l;

  l=&list;

  while (l1 && l2)
    {
      if (compare_func(l1->data,l2->data) < 0)
        {
	  l=l->next=l1;
	  l1=l1->next;
        } 
      else 
	{
	  l=l->next=l2;
	  l2=l2->next;
        }
    }
  l->next= l1 ? l1 : l2;
  
  return list.next;
}

static __inline__ 
JSList* 
jack_slist_sort (JSList       *list,
		 JCompareFunc compare_func)
{
  JSList *l1, *l2;

  if (!list) 
    return NULL;
  if (!list->next) 
    return list;

  l1 = list; 
  l2 = list->next;

  while ((l2 = l2->next) != NULL)
    {
      if ((l2 = l2->next) == NULL) 
	break;
      l1=l1->next;
    }
  l2 = l1->next; 
  l1->next = NULL;

  return jack_slist_sort_merge (jack_slist_sort (list, compare_func),
				jack_slist_sort (l2,   compare_func),
				compare_func);
}

#endif /* __jack_jslist_h__ */