RegstFlt.c revision 818534a1 
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}
72
73/*
74 * Register a filter with the filter machinery by event mask.
75 */
76void
77_XRegisterFilterByMask(
78    Display *display,
79    Window window,
80    unsigned long event_mask,
81    Bool (*filter)(
82		   Display*, Window, XEvent*, XPointer
83		   ),
84    XPointer client_data)
85{
86    XFilterEventRec		*rec;
87
88    rec = Xmalloc(sizeof(XFilterEventRec));
89    if (!rec)
90	return;
91    rec->window = window;
92    rec->event_mask = event_mask;
93    rec->start_type = 0;
94    rec->end_type = 0;
95    rec->filter = filter;
96    rec->client_data = client_data;
97    LockDisplay(display);
98    rec->next = display->im_filters;
99    display->im_filters = rec;
100    display->free_funcs->im_filters = _XFreeIMFilters;
101    UnlockDisplay(display);
102}
103
104/*
105 * Register a filter with the filter machinery by type code.
106 */
107void
108_XRegisterFilterByType(
109    Display *display,
110    Window window,
111    int start_type,
112    int end_type,
113    Bool (*filter)(
114		   Display*, Window, XEvent*, XPointer
115		   ),
116    XPointer client_data)
117{
118    XFilterEventRec		*rec;
119
120    rec = Xmalloc(sizeof(XFilterEventRec));
121    if (!rec)
122	return;
123    rec->window = window;
124    rec->event_mask = 0;
125    rec->start_type = start_type;
126    rec->end_type = end_type;
127    rec->filter = filter;
128    rec->client_data = client_data;
129    LockDisplay(display);
130    rec->next = display->im_filters;
131    display->im_filters = rec;
132    display->free_funcs->im_filters = _XFreeIMFilters;
133    UnlockDisplay(display);
134}
135
136void
137_XUnregisterFilter(
138    Display *display,
139    Window window,
140    Bool (*filter)(
141		   Display*, Window, XEvent*, XPointer
142		   ),
143    XPointer client_data)
144{
145    register XFilterEventList	*prev, fl;
146
147    for (prev = &display->im_filters; (fl = *prev); ) {
148	if (fl->window == window &&
149	    fl->filter == filter && fl->client_data == client_data) {
150	    *prev = fl->next;
151	    Xfree(fl);
152	} else
153	    prev = &fl->next;
154    }
155}
156