xref: /xsrc/external/mit/libXi/dist/src/XGetKMap.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
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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********************************************************/

/***********************************************************************
 *
 * XGetDeviceKeyMapping - get the keymap of an extension device.
 *
 */

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

#include <limits.h>
#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"

KeySym *
XGetDeviceKeyMapping(register Display * dpy, XDevice * dev,
#if NeedWidePrototypes
		     unsigned int first,
#else
		     KeyCode first,
#endif
		     int keycount, int *syms_per_code)
{
    long nbytes;
    register KeySym *mapping = NULL;
    xGetDeviceKeyMappingReq *req;
    xGetDeviceKeyMappingReply rep;
    XExtDisplayInfo *info = XInput_find_display(dpy);

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

    GetReq(GetDeviceKeyMapping, req);
    req->reqType = info->codes->major_opcode;
    req->ReqType = X_GetDeviceKeyMapping;
    req->deviceid = dev->device_id;
    req->firstKeyCode = first;
    req->count = keycount;

    if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
	UnlockDisplay(dpy);
	SyncHandle();
	return (KeySym *) NULL;
    }
    if (rep.length > 0) {
	if (rep.length < INT_MAX >> 2 &&
	    rep.length == rep.keySymsPerKeyCode * keycount) {
	    *syms_per_code = rep.keySymsPerKeyCode;
	    nbytes = (long)rep.length << 2;
	    mapping = (KeySym *) Xmalloc((unsigned)nbytes);
	} else {
	    *syms_per_code = 0;
	    nbytes = 0;
	    mapping = NULL;
	}
	if (mapping)
	    _XRead(dpy, (char *)mapping, nbytes);
	else
	    _XEatDataWords(dpy, rep.length);
    }

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