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

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

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

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

/***********************************************************************
 *
 * XGetDeviceButtonMapping - Get the button mapping of an extension 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>

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

int
XGetDeviceButtonMapping(
    register Display	*dpy,
    XDevice		*device,
    unsigned char	 map[],
    unsigned int	 nmap)
{
    int status = 0;
    unsigned char mapping[256];	/* known fixed size */
    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) {
	if (rep.length <= (sizeof(mapping) >> 2) &&
	    rep.nElts <= (rep.length << 2)) {
	    unsigned long nbytes = rep.length << 2;
	    _XRead(dpy, (char *)mapping, nbytes);

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