Diff of /trunk/mkinitrd-magellan/busybox/libbb/llist.c

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	revision 532 by niro, Sat Sep 1 22:45:15 2007 UTC	revision 816 by niro, Fri Apr 24 18:33:46 2009 UTC
#	Line 4	Line 4
4	*	*
5	* Copyright (C) 2003 Glenn McGrath	* Copyright (C) 2003 Glenn McGrath
6	* Copyright (C) 2005 Vladimir Oleynik	* Copyright (C) 2005 Vladimir Oleynik
7	* Copyright (C) 2005 Bernhard Fischer	* Copyright (C) 2005 Bernhard Reutner-Fischer
8	* Copyright (C) 2006 Rob Landley <rob@landley.net>	* Copyright (C) 2006 Rob Landley <rob@landley.net>
9	*	*
10	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
11	*/	*/
12
	#include <stdlib.h>
13	#include "libbb.h"	#include "libbb.h"
14
15	/* Add data to the start of the linked list.  */	/* Add data to the start of the linked list.  */
16	void llist_add_to(llist_t **old_head, void *data)	void FAST_FUNC llist_add_to(llist_t **old_head, void *data)
17	{	{
18	llist_t *new_head = xmalloc(sizeof(llist_t));	llist_t *new_head = xmalloc(sizeof(llist_t));
19
20	new_head->data = data;	new_head->data = data;
21	new_head->link = *old_head;	new_head->link = *old_head;
22	*old_head = new_head;	*old_head = new_head;
23	}	}
24
25	/* Add data to the end of the linked list.  */	/* Add data to the end of the linked list.  */
26	void llist_add_to_end(llist_t **list_head, void *data)	void FAST_FUNC llist_add_to_end(llist_t **list_head, void *data)
27	{	{
28	llist_t *new_item = xmalloc(sizeof(llist_t));	llist_t *new_item = xmalloc(sizeof(llist_t));
29
30	new_item->data = data;	new_item->data = data;
31	new_item->link = NULL;	new_item->link = NULL;
32
33	if (!*list_head) *list_head = new_item;	if (!*list_head)
34		*list_head = new_item;
35	else {	else {
36	llist_t *tail = *list_head;	llist_t *tail = *list_head;
37	while (tail->link) tail = tail->link;
38		while (tail->link)
39		tail = tail->link;
40	tail->link = new_item;	tail->link = new_item;
41	}	}
42	}	}
43
44	/* Remove first element from the list and return it */	/* Remove first element from the list and return it */
45	void *llist_pop(llist_t **head)	void* FAST_FUNC llist_pop(llist_t **head)
46	{	{
47	void *data;	void *data, *next;
48
49	if(!*head) data = *head;	if (!*head)
50	else {	return NULL;
51	void *next = (*head)->link;
52	data = (*head)->data;	data = (*head)->data;
53	free(*head);	next = (*head)->link;
54	*head = next;	free(*head);
55	}	*head = next;
56
57	return data;	return data;
58	}	}
59
60		/* Unlink arbitrary given element from the list */
61		void FAST_FUNC llist_unlink(llist_t **head, llist_t *elm)
62		{
63		llist_t *crt;
64
65		if (!(elm && *head))
66		return;
67
68		if (elm == *head) {
69		*head = (*head)->link;
70		return;
71		}
72
73		for (crt = *head; crt; crt = crt->link) {
74		if (crt->link == elm) {
75		crt->link = elm->link;
76		return;
77		}
78		}
79		}
80
81	/* Recursively free all elements in the linked list.  If freeit != NULL	/* Recursively free all elements in the linked list.  If freeit != NULL
82	* call it on each datum in the list */	* call it on each datum in the list */
83	void llist_free(llist_t *elm, void (*freeit)(void *data))	void FAST_FUNC llist_free(llist_t *elm, void (*freeit) (void *data))
84	{	{
85	while (elm) {	while (elm) {
86	void *data = llist_pop(&elm);	void *data = llist_pop(&elm);
87	if (freeit) freeit(data);
88		if (freeit)
89		freeit(data);
90	}	}
91	}	}
92
93	/* Reverse list order. Useful since getopt32 saves option params	/* Reverse list order. */
94	* in reverse order */	llist_t* FAST_FUNC llist_rev(llist_t *list)
	llist_t* rev_llist(llist_t *list)
95	{	{
96	llist_t *new = NULL;	llist_t *rev = NULL;
97
98	while (list) {	while (list) {
99	llist_t *next = list->link;	llist_t *next = list->link;
100	list->link = new;
101	new = list;	list->link = rev;
102		rev = list;
103	list = next;	list = next;
104	}	}
105	return new;	return rev;
106	}	}

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