1 /**
2 * @file me_dlist.c
3 *
4 * @brief Implements the device list class.
5 * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
6 * @author Guenter Gebhardt
7 */
8
9 /*
10 * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
11 *
12 * This file is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 */
26
27 #include "meerror.h"
28 #include "medefines.h"
29
30 #include "medlist.h"
31 #include "medebug.h"
32
me_dlist_query_number_devices(struct me_dlist * dlist,int * number)33 int me_dlist_query_number_devices(struct me_dlist *dlist, int *number)
34 {
35 PDEBUG_LOCKS("called.\n");
36 *number = dlist->n;
37 return ME_ERRNO_SUCCESS;
38 }
39
me_dlist_get_number_devices(struct me_dlist * dlist)40 unsigned int me_dlist_get_number_devices(struct me_dlist *dlist)
41 {
42 PDEBUG_LOCKS("called.\n");
43 return dlist->n;
44 }
45
me_dlist_get_device(struct me_dlist * dlist,unsigned int index)46 me_device_t *me_dlist_get_device(struct me_dlist * dlist, unsigned int index)
47 {
48
49 struct list_head *pos;
50 me_device_t *device = NULL;
51 unsigned int i = 0;
52
53 PDEBUG_LOCKS("called.\n");
54
55 if (index >= dlist->n) {
56 PERROR("Index out of range.\n");
57 return NULL;
58 }
59
60 list_for_each(pos, &dlist->head) {
61 if (i == index) {
62 device = list_entry(pos, me_device_t, list);
63 break;
64 }
65
66 ++i;
67 }
68
69 return device;
70 }
71
me_dlist_add_device_tail(struct me_dlist * dlist,me_device_t * device)72 void me_dlist_add_device_tail(struct me_dlist *dlist, me_device_t * device)
73 {
74 PDEBUG_LOCKS("called.\n");
75
76 list_add_tail(&device->list, &dlist->head);
77 ++dlist->n;
78 }
79
me_dlist_del_device_tail(struct me_dlist * dlist)80 me_device_t *me_dlist_del_device_tail(struct me_dlist *dlist)
81 {
82
83 struct list_head *last;
84 me_device_t *device;
85
86 PDEBUG_LOCKS("called.\n");
87
88 if (list_empty(&dlist->head))
89 return NULL;
90
91 last = dlist->head.prev;
92
93 device = list_entry(last, me_device_t, list);
94
95 list_del(last);
96
97 --dlist->n;
98
99 return device;
100 }
101
me_dlist_init(me_dlist_t * dlist)102 int me_dlist_init(me_dlist_t * dlist)
103 {
104 PDEBUG_LOCKS("called.\n");
105
106 INIT_LIST_HEAD(&dlist->head);
107 dlist->n = 0;
108 return 0;
109 }
110
me_dlist_deinit(me_dlist_t * dlist)111 void me_dlist_deinit(me_dlist_t * dlist)
112 {
113
114 struct list_head *s;
115 me_device_t *device;
116
117 PDEBUG_LOCKS("called.\n");
118
119 while (!list_empty(&dlist->head)) {
120 s = dlist->head.next;
121 list_del(s);
122 device = list_entry(s, me_device_t, list);
123 device->me_device_destructor(device);
124 }
125
126 dlist->n = 0;
127 }
128