x-hook.c revision 706f2543 
1/* x-hook.c
2
3   Copyright (c) 2003 Apple Computer, 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#ifdef HAVE_DIX_CONFIG_H
31#include <dix-config.h>
32#endif
33
34#include "x-hook.h"
35#include <stdlib.h>
36#include <assert.h>
37#include "os.h"
38
39#define CELL_NEW(f,d) X_PFX (list_prepend) ((x_list *) (f), (d))
40#define CELL_FREE(c)  X_PFX (list_free_1) (c)
41#define CELL_FUN(c)   ((x_hook_function *) ((c)->next))
42#define CELL_DATA(c)  ((c)->data)
43
44X_EXTERN x_list *
45X_PFX (hook_add) (x_list *lst, x_hook_function *fun, void *data)
46{
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{
53    x_list *node, *cell;
54    x_list *to_delete = NULL;
55
56    for (node = lst; node != NULL; node = node->next)
57    {
58	cell = node->data;
59	if (CELL_FUN (cell) == fun && CELL_DATA (cell) == data)
60	    to_delete = X_PFX (list_prepend) (to_delete, cell);
61    }
62
63    for (node = to_delete; node != NULL; node = node->next)
64    {
65	cell = node->data;
66	lst = X_PFX (list_remove) (lst, cell);
67	CELL_FREE (cell);
68    }
69
70    X_PFX (list_free) (to_delete);
71    return lst;
72}
73
74X_EXTERN void
75X_PFX (hook_run) (x_list *lst, void *arg)
76{
77    x_list *node, *cell;
78    x_hook_function **fun;
79    void **data;
80    int length, i;
81
82    if(!lst)
83        return;
84
85    length = X_PFX (list_length) (lst);
86    fun = malloc(sizeof (x_hook_function *) * length);
87    data = malloc(sizeof (void *) * length);
88
89    if(!fun || !data) {
90        FatalError("Failed to allocate memory in %s\n", __func__);
91    }
92
93    for (i = 0, node = lst; node != NULL; node = node->next, i++)
94    {
95	cell = node->data;
96	fun[i] = CELL_FUN (cell);
97	data[i] = CELL_DATA (cell);
98    }
99
100    for (i = 0; i < length; i++)
101    {
102	(*fun[i]) (arg, data[i]);
103    }
104
105    free(fun);
106    free(data);
107}
108
109X_EXTERN void
110X_PFX (hook_free) (x_list *lst)
111{
112    x_list *node;
113
114    for (node = lst; node != NULL; node = node->next)
115    {
116	CELL_FREE (node->data);
117    }
118
119    X_PFX (list_free) (lst);
120}
121