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

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

Copyright 1989, 1998  The Open Group

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

/***********************************************************************
 *
 * XQueryDeviceState - Query the state of an extension input 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"

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

    LockDisplay(dpy);
    if (_XiCheckExtInit(dpy, XInput_Initial_Release, info) == -1)
	return ((XDeviceState *) NoSuchExtension);

    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)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return (XDeviceState *) NULL;
    }

    rlen = rep.length << 2;
    if (rlen > 0) {
	data = Xmalloc(rlen);
	if (!data) {
	    _XEatData(dpy, (unsigned long)rlen);
	    UnlockDisplay(dpy);
	    SyncHandle();
	    return ((XDeviceState *) NULL);
	}
	_XRead(dpy, data, rlen);

	for (i = 0, any = (XInputClass *) data; i < (int)rep.num_classes; i++) {
	    switch (any->class) {
	    case KeyClass:
		size += sizeof(XKeyState);
		break;
	    case ButtonClass:
		size += sizeof(XButtonState);
		break;
	    case ValuatorClass:
	    {
		xValuatorState *v = (xValuatorState *) any;
		size += (sizeof(XValuatorState) +
			 (v->num_valuators * sizeof(int)));
	    }
		break;
	    }
	    any = (XInputClass *) ((char *)any + any->length);
	}
	state = (XDeviceState *) Xmalloc(size + sizeof(XDeviceState));
	if (!state) {
	    UnlockDisplay(dpy);
	    SyncHandle();
	    return ((XDeviceState *) NULL);
	}
	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);
	}
	Xfree(data);
    }

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

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