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
45 X_EXTERN x_list *
X_PFX(hook_add)46 X_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
50 X_EXTERN x_list *
X_PFX(hook_remove)51 X_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
71 X_EXTERN void
X_PFX(hook_run)72 X_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
88 X_EXTERN void
X_PFX(hook_free)89 X_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