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/* $TOG: MaskEvent.c /main/14 1998/02/06 17:44:18 kaleb $ */
/*
Copyright 1986, 1998 The Open Group
All Rights Reserved.
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.
*/
/* $XFree86: xc/lib/X11/MaskEvent.c,v 3.2 1999/05/09 10:49:49 dawes Exp $ */
#define NEED_EVENTS
#include "Xlibint.h"
#ifdef __STDC__
#define Const const
#else
#define Const /**/
#endif
extern long Const _Xevent_to_mask[];
#define AllPointers (PointerMotionMask|PointerMotionHintMask|ButtonMotionMask)
#define AllButtons (Button1MotionMask|Button2MotionMask|Button3MotionMask|\
Button4MotionMask|Button5MotionMask)
/*
* return the next event in the queue matching one of the events in the mask.
* If no event, flush output, and wait until match succeeds.
* Events earlier in the queue are not discarded.
*/
int
XMaskEvent (dpy, mask, event)
register Display *dpy;
long mask; /* Selected event mask. */
register XEvent *event; /* XEvent to be filled in. */
{
register _XQEvent *prev, *qelt;
unsigned long qe_serial;
LockDisplay(dpy);
prev = NULL;
while (1) {
for (qelt = prev ? prev->next : dpy->head;
qelt;
prev = qelt, qelt = qelt->next) {
if ((qelt->event.type < LASTEvent) &&
(_Xevent_to_mask[qelt->event.type] & mask) &&
((qelt->event.type != MotionNotify) ||
(mask & AllPointers) ||
(mask & AllButtons & qelt->event.xmotion.state))) {
*event = qelt->event;
_XDeq(dpy, prev, qelt);
UnlockDisplay(dpy);
return 0;
}
}
if (prev)
qe_serial = prev->qserial_num;
_XReadEvents(dpy);
if (prev && prev->qserial_num != qe_serial)
/* another thread has snatched this event */
prev = NULL;
}
}
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