XISelEv.c revision c27c18e8 
1/************************************************************
2
3Copyright 2009 Red Hat, Inc.
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of the author shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from the author.
24
25*/
26
27/***********************************************************************
28 *
29 * XISelectEvent - Select for XI2 events.
30 *
31 */
32
33
34#include <stdint.h>
35#include <X11/Xlibint.h>
36#include <X11/extensions/XI2proto.h>
37#include <X11/extensions/XInput2.h>
38#include <X11/extensions/extutil.h>
39#include <X11/extensions/ge.h>
40#include <X11/extensions/geproto.h>
41#include "XIint.h"
42
43int
44XISelectEvents(Display* dpy, Window win, XIEventMask* masks, int num_masks)
45{
46    XIEventMask  *current;
47    xXISelectEventsReq  *req;
48    xXIEventMask mask;
49    int i;
50    int len = 0;
51
52    XExtDisplayInfo *info = XInput_find_display(dpy);
53    LockDisplay(dpy);
54    if (_XiCheckExtInit(dpy, Dont_Check, info) == -1)
55	return (NoSuchExtension);
56    GetReq(XISelectEvents, req);
57
58    req->reqType = info->codes->major_opcode;
59    req->ReqType = X_XISelectEvents;
60    req->win = win;
61    req->num_masks = num_masks;
62
63    /* get the right length */
64    for (i = 0; i < num_masks; i++)
65    {
66        len++;
67        current = &masks[i];
68        len += (current->mask_len + 3)/4;
69    }
70
71    SetReqLen(req, len, len);
72
73    for (i = 0; i < num_masks; i++)
74    {
75        char *buff;
76        current = &masks[i];
77        mask.deviceid = current->deviceid;
78        mask.mask_len = (current->mask_len + 3)/4;
79        /* masks.mask_len is in bytes, but we need 4-byte units on the wire,
80         * and they need to be padded with 0 */
81        buff = calloc(1, mask.mask_len * 4);
82        memcpy(buff, current->mask, current->mask_len);
83        Data32(dpy, &mask, sizeof(xXIEventMask));
84        Data(dpy, buff, mask.mask_len * 4);
85        free(buff);
86    }
87
88    UnlockDisplay(dpy);
89    SyncHandle();
90    return Success;
91
92}
93
94XIEventMask*
95XIGetSelectedEvents(Display* dpy, Window win, int *num_masks_return)
96{
97    int i, len = 0;
98    unsigned char *mask;
99    XIEventMask *mask_out = NULL;
100    xXIEventMask *mask_in = NULL, *mi;
101    xXIGetSelectedEventsReq *req;
102    xXIGetSelectedEventsReply reply;
103
104    XExtDisplayInfo *info = XInput_find_display(dpy);
105    LockDisplay(dpy);
106    if (_XiCheckExtInit(dpy, Dont_Check, info) == -1)
107    {
108        *num_masks_return = -1;
109	return NULL;
110    }
111
112    GetReq(XIGetSelectedEvents, req);
113
114    req->reqType = info->codes->major_opcode;
115    req->ReqType = X_XIGetSelectedEvents;
116    req->win = win;
117
118    if (!_XReply(dpy, (xReply *) &reply, 0, xFalse))
119        goto error;
120
121    if (reply.num_masks == 0)
122    {
123        *num_masks_return = 0;
124        return NULL;
125    }
126
127    mask_in = Xmalloc(reply.length * 4);
128    if (!mask_in)
129        goto error;
130
131    _XRead(dpy, (char*)mask_in, reply.length * 4);
132
133    /* Memory layout of the XIEventMask for a 3 mask reply:
134     * [struct a][struct b][struct c][masks a][masks b][masks c]
135     */
136    len = reply.num_masks * sizeof(XIEventMask);
137
138    for (i = 0, mi = mask_in; i < reply.num_masks; i++)
139    {
140        len += mi->mask_len * 4;
141        mi = (xXIEventMask*)((char*)mi + mi->mask_len * 4);
142        mi++;
143    }
144
145    mask_out = Xmalloc(len);
146    if (!mask_out)
147        goto error;
148
149    mi = mask_in;
150    mask = (unsigned char*)&mask_out[reply.num_masks];
151    for (i = 0; i < reply.num_masks; i++)
152    {
153        mask_out[i].deviceid = mi->deviceid;
154        mask_out[i].mask_len = mi->mask_len * 4;
155        mask_out[i].mask = mask;
156        memcpy(mask_out[i].mask, &mi[1], mask_out[i].mask_len);
157        mask += mask_out[i].mask_len;
158        mi = (xXIEventMask*)((char*)mi + mi->mask_len * 4);
159        mi++;
160    }
161
162    *num_masks_return = reply.num_masks;
163
164    return mask_out;
165
166error:
167    if (mask_in)
168        Xfree(mask_in);
169    *num_masks_return = -1;
170    UnlockDisplay(dpy);
171    SyncHandle();
172    return NULL;
173
174}
175