RegstFlt.c revision d4a3aaf4 
1
2 /*
3  * Copyright 1990, 1991 by OMRON Corporation
4  *
5  * Permission to use, copy, modify, distribute, and sell this software and its
6  * documentation for any purpose is hereby granted without fee, provided that
7  * the above copyright notice appear in all copies and that both that
8  * copyright notice and this permission notice appear in supporting
9  * documentation, and that the name OMRON not be used in
10  * advertising or publicity pertaining to distribution of the software without
11  * specific, written prior permission.  OMRON makes no representations
12  * about the suitability of this software for any purpose.  It is provided
13  * "as is" without express or implied warranty.
14  *
15  * OMRON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
16  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
17  * EVENT SHALL OMRON BE LIABLE FOR ANY SPECIAL, INDIRECT OR
18  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
19  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
20  * TORTUOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
21  * PERFORMANCE OF THIS SOFTWARE.
22  *
23  *	Author:	Seiji Kuwari	OMRON Corporation
24  *				kuwa@omron.co.jp
25  *				kuwa%omron.co.jp@uunet.uu.net
26  */
27/*
28
29Copyright 1990, 1991, 1998  The Open Group
30
31Permission to use, copy, modify, distribute, and sell this software and its
32documentation for any purpose is hereby granted without fee, provided that
33the above copyright notice appear in all copies and that both that
34copyright notice and this permission notice appear in supporting
35documentation.
36
37The above copyright notice and this permission notice shall be included
38in all copies or substantial portions of the Software.
39
40THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
41OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
42MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
43IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
44OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
45ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
46OTHER DEALINGS IN THE SOFTWARE.
47
48Except as contained in this notice, the name of The Open Group shall
49not be used in advertising or otherwise to promote the sale, use or
50other dealings in this Software without prior written authorization
51from The Open Group.
52
53*/
54
55#ifdef HAVE_CONFIG_H
56#include <config.h>
57#endif
58#include "Xlibint.h"
59#include "Xlcint.h"
60
61static void
62_XFreeIMFilters(
63    Display *display)
64{
65    register XFilterEventList fl;
66
67    while ((fl = display->im_filters)) {
68        display->im_filters = fl->next;
69        Xfree(fl);
70    }
71    display->im_filters = NULL;
72}
73
74/*
75 * Register a filter with the filter machinery by event mask.
76 */
77void
78_XRegisterFilterByMask(
79    Display *display,
80    Window window,
81    unsigned long event_mask,
82    Bool (*filter)(
83		   Display*, Window, XEvent*, XPointer
84		   ),
85    XPointer client_data)
86{
87    XFilterEventRec		*rec;
88
89    rec = Xmalloc(sizeof(XFilterEventRec));
90    if (!rec)
91	return;
92    rec->window = window;
93    rec->event_mask = event_mask;
94    rec->start_type = 0;
95    rec->end_type = 0;
96    rec->filter = filter;
97    rec->client_data = client_data;
98    LockDisplay(display);
99    rec->next = display->im_filters;
100    display->im_filters = rec;
101    display->free_funcs->im_filters = _XFreeIMFilters;
102    UnlockDisplay(display);
103}
104
105/*
106 * Register a filter with the filter machinery by type code.
107 */
108void
109_XRegisterFilterByType(
110    Display *display,
111    Window window,
112    int start_type,
113    int end_type,
114    Bool (*filter)(
115		   Display*, Window, XEvent*, XPointer
116		   ),
117    XPointer client_data)
118{
119    XFilterEventRec		*rec;
120
121    rec = Xmalloc(sizeof(XFilterEventRec));
122    if (!rec)
123	return;
124    rec->window = window;
125    rec->event_mask = 0;
126    rec->start_type = start_type;
127    rec->end_type = end_type;
128    rec->filter = filter;
129    rec->client_data = client_data;
130    LockDisplay(display);
131    rec->next = display->im_filters;
132    display->im_filters = rec;
133    display->free_funcs->im_filters = _XFreeIMFilters;
134    UnlockDisplay(display);
135}
136
137void
138_XUnregisterFilter(
139    Display *display,
140    Window window,
141    Bool (*filter)(
142		   Display*, Window, XEvent*, XPointer
143		   ),
144    XPointer client_data)
145{
146    register XFilterEventList	*prev, fl;
147
148    for (prev = &display->im_filters; (fl = *prev); ) {
149	if (fl->window == window &&
150	    fl->filter == filter && fl->client_data == client_data) {
151	    *prev = fl->next;
152	    Xfree(fl);
153	} else
154	    prev = &fl->next;
155    }
156}
157