/**********************************************************************  linkedlist.c **********************************************************************  linkedlist - Linked list implementation (singly- and doubly- linked).  Copyright ?2000-2004, Stewart Adcock <stewart@linux-domain.com>  All rights reserved.  The latest version of this program should be available at:  http://gaul.sourceforge.net/  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 of the License, or  (at your option) any later version.  Alternatively, if your project  is incompatible with the GPL, I will probably agree to requests  for permission to use the terms of any other license.  This program is distributed in the hope that it will be useful, but  WITHOUT ANY WARRANTY WHATSOEVER.  A full copy of the GNU General Public License should be in the file  "COPYING" provided with this distribution; if not, see:  http://www.gnu.org/ **********************************************************************  Synopsis:	Linked list implementations.		Single-linked list functions are named slink_*().		Double-linked list functions are named dlink_*().		MP-safe.		For OpenMP code, USE_OPENMP must be defined and 		linkedlist_init_openmp() must be called prior to any		other function.  To do:        Add sorting functions.                Functions for inserting/appending lists etc. (i.e. slink_append_list() )                Converting slists to dlists, and visa versa.                Equivalent of avltree_destroy().                ?link_unlink_data() etc like delete functions, except without freeing the element(s).  To compile:	gcc linkedlist.c -DLINKEDLIST_COMPILE_MAIN -g -L . -lstuff **********************************************************************/#include "gaul/linkedlist.h"#ifdef LINKEDLIST_COMPILE_MAIN#include <stdio.h>#include <string.h>#endifTHREAD_LOCK_DEFINE_STATIC(slist_chunk_lock);THREAD_LOCK_DEFINE_STATIC(dlist_chunk_lock);static MemChunk *slist_chunk = NULL;static MemChunk *dlist_chunk = NULL;#if USE_OPENMP == 1static boolean linkedlist_openmp_initialised = FALSE;#endif/* * This function must be called before any other functions is OpenMP * code is to be used.  Can be safely called when OpenMP code is not * being used, and can be safely called more than once. */void linkedlist_init_openmp(void)  {#if USE_OPENMP == 1  if (linkedlist_openmp_initialised == FALSE)    {    omp_init_lock(&slist_chunk_lock);    omp_init_lock(&dlist_chunk_lock);    linkedlist_openmp_initialised = TRUE;    }#endif  return;  }SLList *slink_new(void)  {  SLList *element;  THREAD_LOCK(slist_chunk_lock);  if (!slist_chunk)    slist_chunk = mem_chunk_new(sizeof(SLList), 512);  element = (SLList *)mem_chunk_alloc(slist_chunk);  THREAD_UNLOCK(slist_chunk_lock);  element->next = NULL;  element->data = NULL;  return element;  }void slink_free_all(SLList *list)  {  SLList	*element;  THREAD_LOCK(slist_chunk_lock);  while (list)    {    element = list->next;    mem_chunk_free(slist_chunk, list);    list = element;    }  if (mem_chunk_isempty(slist_chunk))    {    mem_chunk_destroy(slist_chunk);    slist_chunk = NULL;    }  THREAD_UNLOCK(slist_chunk_lock);  return;  }void slink_free(SLList *list)  {  if (!list) return;  THREAD_LOCK(slist_chunk_lock);  mem_chunk_free(slist_chunk, list);  if (mem_chunk_isempty(slist_chunk))    {    mem_chunk_destroy(slist_chunk);    slist_chunk = NULL;    }  THREAD_UNLOCK(slist_chunk_lock);  return;  }SLList *slink_append(SLList *list, vpointer data)  {  SLList *new_element;  SLList *last;  new_element = slink_new();  new_element->data = data;  if (!list) return new_element;  last = slink_last(list);  last->next = new_element;  return list;  }SLList *slink_prepend(SLList *list, vpointer data)  {  SLList *new_element;  new_element = slink_new();  new_element->data = data;  new_element->next = list;  return new_element;  }SLList *slink_insert_next(SLList *list, vpointer data)  {  SLList *new_element;  SLList *next;  new_element = slink_new();  new_element->data = data;  if (!list) return new_element;  next = list->next;  list->next = new_element;  new_element->next = next;  return list;  }SLList *slink_insert_index(SLList *list, vpointer data, int index)  {  SLList *prev_list;  SLList *this_list;  SLList *new_element;  new_element = slink_new();  new_element->data = data;  if (!list) return new_element;  prev_list = NULL;  this_list = list;  while ((index-- > 0) && this_list)    {    prev_list = this_list;    this_list = this_list->next;    }  if (!prev_list)    {    new_element->next = list;    return new_element;    }  new_element->next = prev_list->next;  prev_list->next = new_element;  return list;  }SLList *slink_delete_data(SLList *list, vpointer data)  {  SLList *tmp = list;  SLList *prev = NULL;  while (tmp)    {    if (tmp->data == data)      {      if (prev) prev->next = tmp->next;      if (list == tmp) list = list->next;      slink_free(tmp);      return list;      }    prev = tmp;    tmp = tmp->next;    }  return list;  }SLList *slink_delete_all_data(SLList *list, vpointer data)  {  SLList *tmp = list;  SLList *prev = NULL;  while (tmp)    {    if (tmp->data == data)      {      if (prev) prev->next = tmp->next;      if (list == tmp) list = list->next;      slink_free(tmp);      }    else      {      prev = tmp;      tmp = tmp->next;      }    }  return list;  }SLList *slink_delete_link(SLList *list, SLList *link)  {  SLList *tmp = list;  SLList *prev = NULL;  while (tmp)    {    if (tmp == link)      {      if (prev) prev->next = tmp->next;      if (list == tmp) list = list->next;      slink_free(tmp);      return list;      }    prev = tmp;    tmp = tmp->next;    }  return list;  }SLList *slink_clone(SLList *list)  {  SLList *new_element = NULL;  SLList *last;  if (!list) return NULL;  new_element = slink_new();  new_element->data = list->data;  last = new_element;  list = list->next;  while (list)    {    last->next = slink_new();    last = last->next;    last->data = list->data;    list = list->next;    }  return new_element;  }SLList *slink_reverse(SLList *list)  {  SLList *element;  SLList *prev = NULL;  SLList *last = NULL;  while (list)    {    last = list;    element = list->next;    list->next = prev;    prev = list;    list = element;    }  return last;  }SLList *slink_nth(SLList *list, const int index)  {  int	i=index;  while (i > 0 && list)    {    list = list->next;    i--;    }  return list;  }vpointer slink_nth_data(SLList *list, const int index)  {  list = slink_nth(list, index);  return list?list->data:NULL;  }SLList *slink_find(SLList *list, vpointer data)  {  while (list && list->data != data) list = list->next;  return list;  }SLList *slink_find_custom(SLList *list, vpointer data, LLCompareFunc func)  {  if (!func) die("Null pointer to LLCompareFunc passed.");  while (list && func(list->data, data)==FALSE)    list = list->next;  return list;  }int slink_index_link(SLList *list, SLList *link)  {  int i=0;  while (list)    {    if (list == link) return i;    i++;    list = list->next;    }  return -1;  }int slink_index_data(SLList *list, vpointer data)  {  int i=0;  while (list)    {    if (list->data == data) return i;    i++;    list = list->next;    }  return -1;  }SLList *slink_last(SLList *list)  {  if (!list) return NULL;  while (list->next) list = list->next;    return list;  }int slink_size(SLList *list)  {  int	size=0;  while (list)    {    size++;    list = list->next;    }  return size;  }boolean slink_foreach(SLList *list, LLForeachFunc func, vpointer userdata)  {  if (!func) die("Null pointer to LLForeachFunc passed.");  while (list)    {    if ((*func)(list->data, userdata)) return TRUE;    list = list->next;    }  return FALSE;  }SLList *slink_insert_sorted(SLList *list, vpointer data, LLCompareFunc func)  {  SLList *prev_list;  SLList *this_list;  SLList *new_element;  if (!func) die("Null pointer to LLCompareFunc passed.");  new_element = slink_new();  new_element->data = data;  if (!list) return new_element;  prev_list = NULL;  this_list = list;  while (this_list && func(this_list->data, data)<0)    {    prev_list = this_list;    this_list = this_list->next;    }  if (!prev_list)    {    new_element->next = list;    return new_element;    }  new_element->next = prev_list->next;  prev_list->next = new_element;  return list;  }DLList *dlink_new(void)  {  DLList *element;  THREAD_LOCK(dlist_chunk_lock);  if (!dlist_chunk)    dlist_chunk = mem_chunk_new(sizeof(DLList), 512);  element = (DLList *)mem_chunk_alloc(dlist_chunk);  THREAD_UNLOCK(dlist_chunk_lock);  element->prev = NULL;  element->next = NULL;  element->data = NULL;  return element;  }void dlink_free_all(DLList *list)  {  DLList        *list2;  DLList        *element;  if (!list) return;  list2 = list->prev;  THREAD_LOCK(dlist_chunk_lock);  while (list)    {    element = list->next;    mem_chunk_free(dlist_chunk, list);    list = element;    }  while (list2)    {    element = list2->prev;    mem_chunk_free(dlist_chunk, list2);    list2 = element;    }  if (mem_chunk_isempty(dlist_chunk))    {    mem_chunk_destroy(dlist_chunk);    dlist_chunk = NULL;    }  THREAD_UNLOCK(dlist_chunk_lock);  return;  }void dlink_free(DLList *list)  {  if (!list) return;    THREAD_LOCK(dlist_chunk_lock);  mem_chunk_free(dlist_chunk, list);  if (mem_chunk_isempty(dlist_chunk))    {    mem_chunk_destroy(dlist_chunk);    dlist_chunk = NULL;    }  THREAD_UNLOCK(dlist_chunk_lock);  return;  }DLList *dlink_append(DLList *list, vpointer data)  {  DLList *new_element;  DLList *last;    new_element = dlink_new();  new_element->data = data;    if (!list) return new_element;  last = dlink_last(list);  last->next = new_element;  new_element->prev = last;  return list;  }DLList *dlink_prepend(DLList *list, vpointer data)  {  DLList *new_element;    new_element = dlink_new();  new_element->data = data;    if (!list) return new_element;  if (list->prev)    {    list->prev->next = new_element;    new_element->prev = list->prev;    }  list->prev = new_element;  new_element->next = list;    return new_element;  }DLList *dlink_insert_next(DLList *list, vpointer data)  {  DLList *new_element;  DLList *next;  new_element = dlink_new();  new_element->data = data;  if (!list) return new_element;  next = list->next;  if (next)    {    new_element->next = next;    next->prev = new_element;    }  list->next = new_element;  new_element->prev = list;  return list;  }DLList *dlink_insert_prev(DLList *list, vpointer data)  {  DLList *new_element;  DLList *prev;  new_element = dlink_new();  new_element->data = data;  if (!list) return new_element;  prev = list->prev;  if (prev)     {     new_element->prev = prev;