1/* x-hook.c
2 *
3 * Copyright (c) 2002-2012 Apple Inc. All rights reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation files
7 * (the "Software"), to deal in the Software without restriction,
8 * including without limitation the rights to use, copy, modify, merge,
9 * publish, distribute, sublicense, and/or sell copies of the Software,
10 * and to permit persons to whom the Software is furnished to do so,
11 * subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT.  IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT
20 * HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
24 *
25 * Except as contained in this notice, the name(s) of the above
26 * copyright holders shall not be used in advertising or otherwise to
27 * promote the sale, use or other dealings in this Software without
28 * prior written authorization.
29 */
30
31#ifdef HAVE_DIX_CONFIG_H
32#include <dix-config.h>
33#endif
34
35#include "x-hook.h"
36#include <stdlib.h>
37#include <assert.h>
38#include "os.h"
39
40#define CELL_NEW(f, d) X_PFX(list_prepend) ((x_list *)(f), (d))
41#define CELL_FREE(c)   X_PFX(list_free_1) (c)
42#define CELL_FUN(c)    ((x_hook_function *)((c)->next))
43#define CELL_DATA(c)   ((c)->data)
44
45X_EXTERN x_list *
46X_PFX(hook_add) (x_list * lst, x_hook_function * fun, void *data) {
47    return X_PFX(list_prepend) (lst, CELL_NEW(fun, data));
48}
49
50X_EXTERN x_list *
51X_PFX(hook_remove) (x_list * lst, x_hook_function * fun, void *data) {
52    x_list *node, *cell;
53    x_list *to_delete = NULL;
54
55    for (node = lst; node != NULL; node = node->next) {
56        cell = node->data;
57        if (CELL_FUN(cell) == fun && CELL_DATA(cell) == data)
58            to_delete = X_PFX(list_prepend) (to_delete, cell);
59    }
60
61    for (node = to_delete; node != NULL; node = node->next) {
62        cell = node->data;
63        lst = X_PFX(list_remove) (lst, cell);
64        CELL_FREE(cell);
65    }
66
67    X_PFX(list_free) (to_delete);
68    return lst;
69}
70
71X_EXTERN void
72X_PFX(hook_run) (x_list * lst, void *arg) {
73    x_list *node;
74
75    if (!lst)
76        return;
77
78    for (node = lst; node != NULL; node = node->next) {
79        x_list *cell = node->data;
80
81        x_hook_function *fun = CELL_FUN(cell);
82        void *data = CELL_DATA(cell);
83
84        (*fun)(arg, data);
85    }
86}
87
88X_EXTERN void
89X_PFX(hook_free) (x_list * lst) {
90    x_list *node;
91
92    for (node = lst; node != NULL; node = node->next) {
93        CELL_FREE(node->data);
94    }
95
96    X_PFX(list_free) (lst);
97}
98