IABSD.fr/xenocara/lib/libXp/src/XpExtVer.c

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• Author : matthieu
  Date : 2006-11-25 17:22:40
  Hash : 19d7c699
  Message : import from X.Org 7.2RC2

• lib/libXp/src/XpExtVer.c

• /* $Xorg: XpExtVer.c,v 1.4 2000/08/17 19:46:07 cpqbld Exp $ */
  /******************************************************************************
   ******************************************************************************
   **
   ** (c) Copyright 1996 Hewlett-Packard Company
   ** (c) Copyright 1996 International Business Machines Corp.
   ** (c) Copyright 1996 Sun Microsystems, Inc.
   ** (c) Copyright 1996 Novell, Inc.
   ** (c) Copyright 1996 Digital Equipment Corp.
   ** (c) Copyright 1996 Fujitsu Limited
   ** (c) Copyright 1996 Hitachi, Ltd.
   ** 
   ** 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 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
   ** 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.
   **
   ** Except as contained in this notice, the names of the copyright holders shall
   ** not be used in advertising or otherwise to promote the sale, use or other
   ** dealings in this Software without prior written authorization from said
   ** copyright holders.
   **
   ******************************************************************************
   *****************************************************************************/
  /* $XFree86: xc/lib/Xp/XpExtVer.c,v 1.5 2002/10/16 00:37:31 dawes Exp $ */
  
  #define NEED_REPLIES
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  #include <X11/extensions/Printstr.h>
  #include <X11/Xlibint.h>
  #include "XpExtUtil.h"
  
  
  Bool
  XpQueryExtension (
      Display *dpy,
      int     *event_base_return,     /* return value */
      int     *error_base_return      /* return value */
  )
  {
      XExtDisplayInfo *info = (XExtDisplayInfo *) xp_find_display (dpy);
  
      if (XextHasExtension (info)) {
          *event_base_return = info->codes->first_event;
          *error_base_return = info->codes->first_error;
          return True;
      } else {
          return False;
      }
  }
  
  /* Prototype for |XpCheckExtInitUnlocked()|
   * See XpExtUtil.c - same as |XpCheckExtInit()| but does not obtain the Xlib global lock */
  extern int XpCheckExtInitUnlocked(
      register	Display *dpy,
      register	int	version_index
  );
      
  Status
  XpQueryVersion (
      Display  *dpy,
      short    *major_version,
      short    *minor_version
  )
  {
      xPrintQueryVersionReq     *req;
      xPrintQueryVersionReply   rep;
      XExtDisplayInfo *info = (XExtDisplayInfo *) xp_find_display (dpy);
  
      /*
       * Note: many extensions treat major and minor as "ints", but
       * protocol wise and internal wise, they're shorts.
       */
      *major_version = 0;
      *minor_version = 0;
  
  #ifdef Would_Need_xpPrintData_Struct_Def
      /*
       * We may already have the answer cached from a previous query.
       */
      if (( info->data ) && ( ((xpPrintData *) info->data)->vers->present )) {
  	*major_version = ((xpPrintData *) info->data)->vers->major_version ;
  	*minor_version = ((xpPrintData *) info->data)->vers->minor_version ;
  	return (/* non-zero indicates extension present */ True);
      }
  #endif /* Would_Need_xpPrintData_Struct_Def */
  
      if (XpCheckExtInitUnlocked(dpy, XP_DONT_CHECK) == -1)
          return (/* No such extension */ False);
  
      LockDisplay (dpy);
  
      GetReq(PrintQueryVersion,req);
      req->reqType = info->codes->major_opcode;
      req->printReqType = X_PrintQueryVersion;
  
      if (! _XReply (dpy, (xReply *) &rep, 0, xTrue)) {
          UnlockDisplay(dpy);
          SyncHandle();
          return(/* No such extension */ False);
      }
  
      *major_version = rep.majorVersion;
      *minor_version = rep.minorVersion;
  
      UnlockDisplay(dpy);
      SyncHandle();
      return (/* non-zero indicates extension present */ True);
  }