XIQueryDevice.c revision b789ec8a 
1/*
2 * Copyright © 2009 Red Hat, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 */
24
25#include <stdint.h>
26#include <X11/Xlibint.h>
27#include <X11/extensions/XI2proto.h>
28#include <X11/extensions/XInput2.h>
29#include <X11/extensions/extutil.h>
30#include "XIint.h"
31
32extern int copy_classes(XIDeviceInfo* to, xXIAnyInfo* from, int nclasses);
33extern int size_classes(xXIAnyInfo* from, int nclasses);
34
35XIDeviceInfo*
36XIQueryDevice(Display *dpy, int deviceid, int *ndevices_return)
37{
38    XIDeviceInfo        *info = NULL;
39    xXIQueryDeviceReq   *req;
40    xXIQueryDeviceReply reply;
41    char                *ptr;
42    int                 i;
43    char                *buf;
44
45    XExtDisplayInfo *extinfo = XInput_find_display(dpy);
46
47    LockDisplay(dpy);
48    if (_XiCheckExtInit(dpy, XInput_2_0, extinfo) == -1)
49	goto error;
50
51    GetReq(XIQueryDevice, req);
52    req->reqType  = extinfo->codes->major_opcode;
53    req->ReqType  = X_XIQueryDevice;
54    req->deviceid = deviceid;
55
56    if (!_XReply(dpy, (xReply*) &reply, 0, xFalse))
57        goto error;
58
59    *ndevices_return = reply.num_devices;
60    info = Xmalloc((reply.num_devices + 1) * sizeof(XIDeviceInfo));
61    if (!info)
62        goto error;
63
64    buf = Xmalloc(reply.length * 4);
65    _XRead(dpy, buf, reply.length * 4);
66    ptr = buf;
67
68    /* info is a null-terminated array */
69    info[reply.num_devices].name = NULL;
70
71    for (i = 0; i < reply.num_devices; i++)
72    {
73        XIDeviceInfo    *lib = &info[i];
74        xXIDeviceInfo   *wire = (xXIDeviceInfo*)ptr;
75
76        lib->deviceid    = wire->deviceid;
77        lib->use         = wire->use;
78        lib->attachment  = wire->attachment;
79        lib->enabled     = wire->enabled;
80        lib->num_classes = wire->num_classes;
81        lib->classes     = (XIAnyClassInfo**)&lib[1];
82
83        ptr += sizeof(xXIDeviceInfo);
84
85        lib->name = Xcalloc(wire->name_len + 1, 1);
86        strncpy(lib->name, ptr, wire->name_len);
87        ptr += ((wire->name_len + 3)/4) * 4;
88
89        lib->classes = Xmalloc(size_classes((xXIAnyInfo*)ptr, lib->num_classes));
90        ptr += copy_classes(lib, (xXIAnyInfo*)ptr, lib->num_classes);
91    }
92
93    Xfree(buf);
94    UnlockDisplay(dpy);
95    SyncHandle();
96    return info;
97
98error:
99    UnlockDisplay(dpy);
100    SyncHandle();
101    *ndevices_return = -1;
102    return NULL;
103}
104
105void
106XIFreeDeviceInfo(XIDeviceInfo* info)
107{
108    XIDeviceInfo *ptr = info;
109    while(ptr->name)
110    {
111        Xfree(ptr->classes);
112        Xfree(ptr->name);
113        ptr++;
114    }
115    Xfree(info);
116}
117