1 /*
2 * Bag of pointers
3 * Copyright (c) 2001 by Abramo Bagnara <abramo@alsa-project.org>
4 *
5 *
6 * This library is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as
8 * published by the Free Software Foundation; either version 2.1 of
9 * the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 */
21
22 #include "mixer_local.h"
23
bag_new(bag_t ** bag)24 int bag_new(bag_t **bag)
25 {
26 bag_t *b = malloc(sizeof(*b));
27 if (!b)
28 return -ENOMEM;
29 INIT_LIST_HEAD(b);
30 *bag = b;
31 return 0;
32 }
33
bag_free(bag_t * bag)34 void bag_free(bag_t *bag)
35 {
36 assert(list_empty(bag));
37 free(bag);
38 }
39
bag_empty(bag_t * bag)40 int bag_empty(bag_t *bag)
41 {
42 return list_empty(bag);
43 }
44
bag_add(bag_t * bag,void * ptr)45 int bag_add(bag_t *bag, void *ptr)
46 {
47 bag1_t *b = malloc(sizeof(*b));
48 if (!b)
49 return -ENOMEM;
50 b->ptr = ptr;
51 list_add_tail(&b->list, bag);
52 return 0;
53 }
54
bag_del(bag_t * bag,void * ptr)55 int bag_del(bag_t *bag, void *ptr)
56 {
57 struct list_head *pos;
58 list_for_each(pos, bag) {
59 bag1_t *b = list_entry(pos, bag1_t, list);
60 if (b->ptr == ptr) {
61 list_del(&b->list);
62 free(b);
63 return 0;
64 }
65 }
66 return -ENOENT;
67 }
68
bag_del_all(bag_t * bag)69 void bag_del_all(bag_t *bag)
70 {
71 while (!list_empty(bag))
72 list_del(bag->next);
73 }
74