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.
 *
 */

#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(
    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);
}