xref: /xsrc/external/mit/libXi/dist/src/XGetBMap.c

/* $Xorg: XGetBMap.c,v 1.4 2001/02/09 02:03:50 xorgcvs Exp $ */

/************************************************************

Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
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in this Software without prior written authorization from The Open Group.

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
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********************************************************/
/* $XFree86: xc/lib/Xi/XGetBMap.c,v 3.3 2001/12/14 19:55:13 dawes Exp $ */

/***********************************************************************
 *
 * XGetDeviceButtonMapping - Get the button mapping of an extension device.
 *
 */

#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"

#ifdef MIN	/* some systems define this in <sys/param.h> */
#undef MIN
#endif
#define MIN(a, b) ((a) < (b) ? (a) : (b))

int
XGetDeviceButtonMapping(dpy, device, map, nmap)
    register Display *dpy;
    XDevice *device;
    unsigned char map[];
    unsigned int nmap;
{
    int status = 0;
    unsigned char mapping[256];	/* known fixed size */
    long nbytes;
    XExtDisplayInfo *info = XInput_find_display(dpy);

    register xGetDeviceButtonMappingReq *req;
    xGetDeviceButtonMappingReply rep;

    LockDisplay(dpy);
    if (_XiCheckExtInit(dpy, XInput_Initial_Release, info) == -1)
	return (NoSuchExtension);
    GetReq(GetDeviceButtonMapping, req);

    req->reqType = info->codes->major_opcode;
    req->ReqType = X_GetDeviceButtonMapping;
    req->deviceid = device->device_id;

    status = _XReply(dpy, (xReply *) & rep, 0, xFalse);
    if (status == 1) {
	nbytes = (long)rep.length << 2;
	_XRead(dpy, (char *)mapping, nbytes);

	/* don't return more data than the user asked for. */
	if (rep.nElts)
	    memcpy((char *)map, (char *)mapping, MIN((int)rep.nElts, nmap));
	status = rep.nElts;
    } else
	status = 0;
    UnlockDisplay(dpy);
    SyncHandle();
    return (status);
}