xlist.c
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上传日期:2020-07-06
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midi
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Unix_Linux
- /*****************************************************************************
- * xlist.c : a simple doubly linked list in C
- *****************************************************************************
- * Copyright (C) 2003-2004 Commonwealth Scientific and Industrial Research
- * Organisation (CSIRO) Australia
- * Copyright (C) 2000-2004 the VideoLAN team
- *
- * $Id: bc91d1573c8868ce0cbe406890b3cb9265437fe1 $
- *
- * Authors: Conrad Parker <Conrad.Parker@csiro.au>
- * Andre Pang <Andre.Pang@csiro.au>
- *
- * 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.
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <stdlib.h>
- #include "xlist.h"
- static XList *
- xlist_node_new (void * data)
- {
- XList * l;
- l = (XList *) malloc (sizeof (XList));
- l->prev = l->next = NULL;
- l->data = data;
- return l;
- }
- XList *
- xlist_new (void)
- {
- return NULL;
- }
- XList *
- xlist_clone (XList * list)
- {
- XList * l, * new_list;
- if (list == NULL) return NULL;
- new_list = xlist_new ();
- for (l = list; l; l = l->next) {
- new_list = xlist_append (new_list, l->data);
- }
- return new_list;
- }
- XList *
- xlist_clone_with (XList * list, XCloneFunc clone)
- {
- XList * l, * new_list;
- void * new_data;
- if (list == NULL) return NULL;
- if (clone == NULL) return xlist_clone (list);
- new_list = xlist_new ();
- for (l = list; l; l = l->next) {
- new_data = clone (l->data);
- new_list = xlist_append (new_list, new_data);
- }
- return new_list;
- }
- XList *
- xlist_tail (XList * list)
- {
- XList * l;
- for (l = list; l; l = l->next)
- if (l->next == NULL) return l;
- return NULL;
- }
- XList *
- xlist_prepend (XList * list, void * data)
- {
- XList * l = xlist_node_new (data);
- if (list == NULL) return l;
- l->next = list;
- list->prev = l;
- return l;
- }
- XList *
- xlist_append (XList * list, void * data)
- {
- XList * l = xlist_node_new (data);
- XList * last;
- if (list == NULL) return l;
- last = xlist_tail (list);
- last->next = l;
- l->prev = last;
- return list;
- }
- XList *
- xlist_add_before (XList * list, void * data, XList * node)
- {
- XList * l, * p;
- if (list == NULL) return xlist_node_new (data);
- if (node == NULL) return xlist_append (list, data);
- if (node == list) return xlist_prepend (list, data);
- l = xlist_node_new (data);
- p = node->prev;
- l->prev = p;
- l->next = node;
- if (p) p->next = l;
- node->prev = l;
- return list;
- }
- XList *
- xlist_add_after (XList * list, void * data, XList * node)
- {
- XList * l, * n;
- if (node == NULL) return xlist_prepend (list, data);
- l = xlist_node_new (data);
- n = node->next;
- l->prev = node;
- l->next = n;
- if (n) n->prev = l;
- node->next = l;
- return list;
- }
- XList *
- xlist_find (XList * list, void * data)
- {
- XList * l;
- for (l = list; l; l = l->next)
- if (l->data == data) return l;
- return NULL;
- }
- XList *
- xlist_remove (XList * list, XList * node)
- {
- if (node == NULL) return list;
- if (node->prev) node->prev->next = node->next;
- if (node->next) node->next->prev = node->prev;
- if (node == list) return list->next;
- else return list;
- }
- int
- xlist_length (XList * list)
- {
- XList * l;
- int c = 0;
- for (l = list; l; l = l->next)
- c++;
- return c;
- }
- int
- xlist_is_empty (XList * list)
- {
- return (list == NULL);
- }
- int
- xlist_is_singleton (XList * list)
- {
- if (list == NULL) return 0;
- if (list->next == NULL) return 1;
- else return 0;
- }
- /*
- * xlist_free_with (list, free_func)
- *
- * Step through list 'list', freeing each node using free_func(), and
- * also free the list structure itself.
- */
- XList *
- xlist_free_with (XList * list, XFreeFunc free_func)
- {
- XList * l, * ln;
- for (l = list; l; l = ln) {
- ln = l->next;
- free_func (l->data);
- free (l);
- }
- return NULL;
- }
- /*
- * xlist_free (list)
- *
- * Free the list structure 'list', but not its nodes.
- */
- XList *
- xlist_free (XList * list)
- {
- XList * l, * ln;
- for (l = list; l; l = ln) {
- ln = l->next;
- free (l);
- }
- return NULL;
- }