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      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 (at) omron.co.jp
     25   *				kuwa%omron.co.jp (at) uunet.uu.net
     26   */
     27 /*
     28 
     29 Copyright 1990, 1991, 1998  The Open Group
     30 
     31 Permission to use, copy, modify, distribute, and sell this software and its
     32 documentation for any purpose is hereby granted without fee, provided that
     33 the above copyright notice appear in all copies and that both that
     34 copyright notice and this permission notice appear in supporting
     35 documentation.
     36 
     37 The above copyright notice and this permission notice shall be included
     38 in all copies or substantial portions of the Software.
     39 
     40 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     41 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     42 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     43 IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
     44 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     45 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     46 OTHER DEALINGS IN THE SOFTWARE.
     47 
     48 Except as contained in this notice, the name of The Open Group shall
     49 not be used in advertising or otherwise to promote the sale, use or
     50 other dealings in this Software without prior written authorization
     51 from 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 
     61 static 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  */
     77 void
     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  */
    108 void
    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 
    137 void
    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