IABSD.fr/xenocara/xserver/Xi/xiqueryversion.c

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• Author : matthieu
  Date : 2019-07-27 07:57:06
  Hash : a77e9959
  Message : Update to xserver 1.20.5. Tested by jsg@

• xserver/Xi/xiqueryversion.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.
   *
   * Authors: Peter Hutterer
   *
   */
  
  /**
   * @file xiqueryversion.c
   * Protocol handling for the XIQueryVersion request/reply.
   */
  
  #ifdef HAVE_DIX_CONFIG_H
  #include <dix-config.h>
  #endif
  
  #include "inputstr.h"
  
  #include <X11/Xmd.h>
  #include <X11/X.h>
  #include <X11/extensions/XI2proto.h>
  
  #include "exglobals.h"
  #include "exevents.h"
  #include "xiqueryversion.h"
  #include "misc.h"
  
  extern XExtensionVersion XIVersion;     /* defined in getvers.c */
  
  /**
   * Return the supported XI version.
   *
   * Saves the version the client claims to support as well, for future
   * reference.
   */
  int
  ProcXIQueryVersion(ClientPtr client)
  {
      xXIQueryVersionReply rep;
      XIClientPtr pXIClient;
      int major, minor;
  
      REQUEST(xXIQueryVersionReq);
      REQUEST_SIZE_MATCH(xXIQueryVersionReq);
  
      /* This request only exists after XI2 */
      if (stuff->major_version < 2) {
          client->errorValue = stuff->major_version;
          return BadValue;
      }
  
      pXIClient = dixLookupPrivate(&client->devPrivates, XIClientPrivateKey);
  
      if (version_compare(XIVersion.major_version, XIVersion.minor_version,
                  stuff->major_version, stuff->minor_version) > 0) {
          major = stuff->major_version;
          minor = stuff->minor_version;
      } else {
          major = XIVersion.major_version;
          minor = XIVersion.minor_version;
      }
  
      if (pXIClient->major_version) {
  
          /* Check to see if the client has only ever asked
           * for version 2.2 or higher
           */
          if (version_compare(major, minor, 2, 2) >= 0 &&
              version_compare(pXIClient->major_version, pXIClient->minor_version, 2, 2) >= 0)
          {
  
              /* As of version 2.2, Peter promises to never again break
               * backward compatibility, so we'll return the requested
               * version to the client but leave the server internal
               * version set to the highest requested value
               */
              if (version_compare(major, minor,
                                  pXIClient->major_version, pXIClient->minor_version) > 0)
              {
                  pXIClient->major_version = major;
                  pXIClient->minor_version = minor;
              }
          } else {
              if (version_compare(major, minor,
                                  pXIClient->major_version, pXIClient->minor_version) < 0) {
  
                  client->errorValue = stuff->major_version;
                  return BadValue;
              }
              major = pXIClient->major_version;
              minor = pXIClient->minor_version;
          }
      } else {
          pXIClient->major_version = major;
          pXIClient->minor_version = minor;
      }
  
      rep = (xXIQueryVersionReply) {
          .repType = X_Reply,
          .RepType = X_XIQueryVersion,
          .sequenceNumber = client->sequence,
          .length = 0,
          .major_version = major,
          .minor_version = minor
      };
  
      WriteReplyToClient(client, sizeof(xXIQueryVersionReply), &rep);
  
      return Success;
  }
  
  /* Swapping routines */
  
  int _X_COLD
  SProcXIQueryVersion(ClientPtr client)
  {
      REQUEST(xXIQueryVersionReq);
      swaps(&stuff->length);
      REQUEST_AT_LEAST_SIZE(xXIQueryVersionReq);
      swaps(&stuff->major_version);
      swaps(&stuff->minor_version);
      return (ProcXIQueryVersion(client));
  }
  
  void _X_COLD
  SRepXIQueryVersion(ClientPtr client, int size, xXIQueryVersionReply * rep)
  {
      swaps(&rep->sequenceNumber);
      swapl(&rep->length);
      swaps(&rep->major_version);
      swaps(&rep->minor_version);
      WriteToClient(client, size, rep);
  }