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

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

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
the above copyright notice appear in all copies and that both that
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all copies or substantial portions of the Software.

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Except as contained in this notice, the name of The Open Group shall not be
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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
supporting documentation, and that the name of Hewlett-Packard not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

HEWLETT-PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
HEWLETT-PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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********************************************************/

/***********************************************************************
 *
 * XQueryDeviceState - Query the state of an extension input device.
 *
 */
#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"
#include <limits.h>

XDeviceState *
XQueryDeviceState(
    register Display	*dpy,
    XDevice		*dev)
{
    int i, j;
    unsigned long rlen;
    size_t size = 0;
    xQueryDeviceStateReq *req;
    xQueryDeviceStateReply rep;
    XDeviceState *state = NULL;
    XInputClass *any, *Any;
    char *data = NULL, *end = NULL;
    XExtDisplayInfo *info = XInput_find_display(dpy);

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

    GetReq(QueryDeviceState, req);
    req->reqType = info->codes->major_opcode;
    req->ReqType = X_QueryDeviceState;
    req->deviceid = dev->device_id;

    if (!_XReply(dpy, (xReply *) & rep, 0, xFalse))
        goto out;

    if (rep.length > 0) {
	if (rep.length < (INT_MAX >> 2)) {
	    rlen = (unsigned long) rep.length << 2;
	    data = Xmalloc(rlen);
	    end = data + rlen;
	}
	if (!data) {
	    _XEatDataWords(dpy, rep.length);
	    goto out;
	}
	_XRead(dpy, data, rlen);

	for (i = 0, any = (XInputClass *) data; i < (int)rep.num_classes; i++) {
	    if ((char *)any + sizeof(XInputClass) > end ||
		any->length == 0 || any->length > rlen)
		goto out;
	    rlen -= any->length;

	    switch (any->class) {
	    case KeyClass:
		size += sizeof(XKeyState);
		break;
	    case ButtonClass:
		size += sizeof(XButtonState);
		break;
	    case ValuatorClass:
	    {
		xValuatorState *v = (xValuatorState *) any;
		if ((char *)any + sizeof(xValuatorState) > end)
		    goto out;
		size += (sizeof(XValuatorState) +
			 (v->num_valuators * sizeof(int)));
	    }
		break;
	    }
	    any = (XInputClass *) ((char *)any + any->length);
	}
	state = (XDeviceState *) Xmalloc(size + sizeof(XDeviceState));
	if (!state)
            goto out;

	state->device_id = dev->device_id;
	state->num_classes = rep.num_classes;
	state->data = (XInputClass *) (state + 1);

	Any = state->data;
	for (i = 0, any = (XInputClass *) data; i < (int)rep.num_classes; i++) {
	    switch (any->class) {
	    case KeyClass:
	    {
		xKeyState *k = (xKeyState *) any;
		XKeyState *K = (XKeyState *) Any;

		K->class = k->class;
		K->length = sizeof(XKeyState);
		K->num_keys = k->num_keys;
		memcpy((char *)&K->keys[0], (char *)&k->keys[0], 32);
		Any = (XInputClass *) (K + 1);
	    }
		break;
	    case ButtonClass:
	    {
		xButtonState *b = (xButtonState *) any;
		XButtonState *B = (XButtonState *) Any;

		B->class = b->class;
		B->length = sizeof(XButtonState);
		B->num_buttons = b->num_buttons;
		memcpy((char *)&B->buttons[0], (char *)&b->buttons[0], 32);
		Any = (XInputClass *) (B + 1);
	    }
		break;
	    case ValuatorClass:
	    {
		xValuatorState *v = (xValuatorState *) any;
		XValuatorState *V = (XValuatorState *) Any;
		CARD32 *valuators = (CARD32 *) (v + 1);

		V->class = v->class;
		V->length = sizeof(XValuatorState) +
			    v->num_valuators * sizeof(int);
		V->num_valuators = v->num_valuators;
		V->mode = v->mode;
		Any = (XInputClass *) (V + 1);
		V->valuators = (int *)Any;
		for (j = 0; j < (int)V->num_valuators; j++)
		    *(V->valuators + j) = *valuators++;
		Any = (XInputClass *) ((char *)Any +
				       V->num_valuators * sizeof(int));
	    }
		break;
	    }
	    any = (XInputClass *) ((char *)any + any->length);
	}
    }
out:
    Xfree(data);

    UnlockDisplay(dpy);
    SyncHandle();
    return (state);
}

void
XFreeDeviceState(XDeviceState *list)
{
    XFree((char *)list);
}