#include <stdint.h>
#include <X11/Xlibint.h>
#include <X11/extensions/XI2proto.h>
#include <X11/extensions/XInput2.h>
#include <X11/extensions/extutil.h>
#include "XIint.h"
extern int copy_classes(XIDeviceInfo* to, xXIAnyInfo* from, int nclasses);
extern int size_classes(xXIAnyInfo* from, int nclasses);
XIDeviceInfo*
XIQueryDevice(Display *dpy, int deviceid, int *ndevices_return)
{
XIDeviceInfo *info = NULL;
xXIQueryDeviceReq *req;
xXIQueryDeviceReply reply;
char *ptr;
int i;
char *buf;
XExtDisplayInfo *extinfo = XInput_find_display(dpy);
LockDisplay(dpy);
if (_XiCheckExtInit(dpy, XInput_2_0, extinfo) == -1)
goto error;
GetReq(XIQueryDevice, req);
req->reqType = extinfo->codes->major_opcode;
req->ReqType = X_XIQueryDevice;
req->deviceid = deviceid;
if (!_XReply(dpy, (xReply*) &reply, 0, xFalse))
goto error;
*ndevices_return = reply.num_devices;
info = Xmalloc((reply.num_devices + 1) * sizeof(XIDeviceInfo));
if (!info)
goto error;
buf = Xmalloc(reply.length * 4);
_XRead(dpy, buf, reply.length * 4);
ptr = buf;
info[reply.num_devices].name = NULL;
for (i = 0; i < reply.num_devices; i++)
{
XIDeviceInfo *lib = &info[i];
xXIDeviceInfo *wire = (xXIDeviceInfo*)ptr;
lib->deviceid = wire->deviceid;
lib->use = wire->use;
lib->attachment = wire->attachment;
lib->enabled = wire->enabled;
lib->num_classes = wire->num_classes;
lib->classes = (XIAnyClassInfo**)&lib[1];
ptr += sizeof(xXIDeviceInfo);
lib->name = Xcalloc(wire->name_len + 1, 1);
strncpy(lib->name, ptr, wire->name_len);
ptr += ((wire->name_len + 3)/4) * 4;
lib->classes = Xmalloc(size_classes((xXIAnyInfo*)ptr, lib->num_classes));
ptr += copy_classes(lib, (xXIAnyInfo*)ptr, lib->num_classes);
}
Xfree(buf);
UnlockDisplay(dpy);
SyncHandle();
return info;
error:
UnlockDisplay(dpy);
SyncHandle();
*ndevices_return = -1;
return NULL;
}
void
XIFreeDeviceInfo(XIDeviceInfo* info)
{
XIDeviceInfo *ptr = info;
while(ptr->name)
{
Xfree(ptr->classes);
Xfree(ptr->name);
ptr++;
}
Xfree(info);
}