src/XGetVers.c - master - niceSOFT/libXi

src/XGetVers.c
111 строк4 KB
Michal Srb
Refactor XGetExtensionVersion.
03 ноя 2014, 08:28
03 ноя 2014, 08:2829c7745
/************************************************************

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Copyright 1989 by Hewlett-Packard Company, Palo Alto, California.

			All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Hewlett-Packard not be
used in advertising or publicity pertaining to distribution of the
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********************************************************/

/***********************************************************************
 *
 * XGetExtensionVersion - Get the version of the input extension.
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>
#include <X11/Xlibint.h>
#include <X11/extensions/XInput.h>
#include <X11/extensions/extutil.h>
#include "XIint.h"

XExtensionVersion *
XGetExtensionVersion(register Display * dpy, _Xconst char *name)
{
    XExtensionVersion *ext;
    XExtDisplayInfo *info = XInput_find_display(dpy);

    LockDisplay(dpy);

    if (_XiCheckExtInit(dpy, Dont_Check, info) == -1)
        return NULL;

    ext = _XiGetExtensionVersionRequest(dpy, name, info->codes->major_opcode);

    UnlockDisplay(dpy);
    SyncHandle();

    return ext;
}

_X_HIDDEN XExtensionVersion*
_XiGetExtensionVersionRequest(Display *dpy, _Xconst char *name, int xi_opcode)
{
    xGetExtensionVersionReq *req;
    xGetExtensionVersionReply rep;
    XExtensionVersion *ext;

    GetReq(GetExtensionVersion, req);
    req->reqType = xi_opcode;
    req->ReqType = X_GetExtensionVersion;
    req->nbytes = strlen(name);
    req->length += (unsigned)(req->nbytes + 3) >> 2;
    _XSend(dpy, name, (long)req->nbytes);

    if (!_XReply(dpy, (xReply *) & rep, 0, xTrue)) {
	return NULL;
    }

    ext = (XExtensionVersion *) Xmalloc(sizeof(XExtensionVersion));
    if (ext) {
	ext->present = rep.present;
	if (ext->present) {
	    ext->major_version = rep.major_version;
	    ext->minor_version = rep.minor_version;
	}
    }

    return ext;
}