IABSD.fr/xenocara/lib/libXi/src/XIQueryDevice.c

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• Author : matthieu
  Date : 2011-12-17 17:39:19
  Hash : da4d50a4
  Message : Update to libXi 1.4.4.

• lib/libXi/src/XIQueryDevice.c

• /*
   * Copyright © 2009 Red Hat, Inc.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   *
   */
  
  #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 is a null-terminated array */
      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);
  }