[deb_xorg-server.git] / input / ChkNotMaskEv.c

/*
 * Copyright 1985, 1987, 1998  The Open Group
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation.
 *
 * 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 */

/*
 * Copyright 2002-2003 Red Hat Inc., Durham, North Carolina.
 *
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation on the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) 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
 * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
 * 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.
 */

/** \file
 * This file provides a #XCheckNotMaskEvent function that is derived
 * from the standard Xlib XCheckMaskEvent function. */

#ifdef HAVE_DMX_CONFIG_H
#include <dmx-config.h>
#endif

#include "dmx.h"
#include "ChkNotMaskEv.h"

extern long const _Xevent_to_mask[];

/** Check existing events in queue to find if any match.  If so, return.
 * If not, flush buffer and see if any more events are readable. If one
 * matches, return.  If all else fails, tell the user no events found.
 */
Bool
XCheckNotMaskEvent(Display * dpy, long mask, XEvent * event)
{
    register _XQEvent *prev, *qelt;
    unsigned long qe_serial = 0;
    int n;                      /* time through count */

    LockDisplay(dpy);
    prev = NULL;
    for (n = 3; --n >= 0;) {
        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)) {
                *event = qelt->event;
                _XDeq(dpy, prev, qelt);
                UnlockDisplay(dpy);
                return True;
            }
        }
        if (prev)
            qe_serial = prev->qserial_num;
        switch (n) {
        case 2:
            _XEventsQueued(dpy, QueuedAfterReading);
            break;
        case 1:
            _XFlush(dpy);
            break;
        }
        if (prev && prev->qserial_num != qe_serial)
            /* another thread has snatched this event */
            prev = NULL;
    }
    UnlockDisplay(dpy);
    return False;
}
Commit	Line	Data
	1	/*
	2	* Copyright 1985, 1987, 1998 The Open Group
	3	*
	4	* Permission to use, copy, modify, distribute, and sell this software and its
	5	* documentation for any purpose is hereby granted without fee, provided that
	6	* the above copyright notice appear in all copies and that both that
	7	* copyright notice and this permission notice appear in supporting
	8	* documentation.
	9	*
	10	* The above copyright notice and this permission notice shall be included in
	11	* all copies or substantial portions of the Software.
	12	*
	13	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	14	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	15	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	16	* OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
	17	* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	18	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	19	*
	20	* Except as contained in this notice, the name of The Open Group shall not be
	21	* used in advertising or otherwise to promote the sale, use or other dealings
	22	* in this Software without prior written authorization from The Open Group.
	23	*/
	24	/* $XFree86 */
	25
	26	/*
	27	* Copyright 2002-2003 Red Hat Inc., Durham, North Carolina.
	28	*
	29	* All Rights Reserved.
	30	*
	31	* Permission is hereby granted, free of charge, to any person obtaining
	32	* a copy of this software and associated documentation files (the
	33	* "Software"), to deal in the Software without restriction, including
	34	* without limitation on the rights to use, copy, modify, merge,
	35	* publish, distribute, sublicense, and/or sell copies of the Software,
	36	* and to permit persons to whom the Software is furnished to do so,
	37	* subject to the following conditions:
	38	*
	39	* The above copyright notice and this permission notice (including the
	40	* next paragraph) shall be included in all copies or substantial
	41	* portions of the Software.
	42	*
	43	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	44	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	45	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	46	* NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
	47	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	48	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	49	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	50	* SOFTWARE.
	51	*/
	52
	53	/** \file
	54	* This file provides a #XCheckNotMaskEvent function that is derived
	55	* from the standard Xlib XCheckMaskEvent function. */
	56
	57	#ifdef HAVE_DMX_CONFIG_H
	58	#include <dmx-config.h>
	59	#endif
	60
	61	#include "dmx.h"
	62	#include "ChkNotMaskEv.h"
	63
	64	extern long const _Xevent_to_mask[];
	65
	66	/** Check existing events in queue to find if any match. If so, return.
	67	* If not, flush buffer and see if any more events are readable. If one
	68	* matches, return. If all else fails, tell the user no events found.
	69	*/
	70	Bool
	71	XCheckNotMaskEvent(Display * dpy, long mask, XEvent * event)
	72	{
	73	register _XQEvent prev, qelt;
	74	unsigned long qe_serial = 0;
	75	int n; /* time through count */
	76
	77	LockDisplay(dpy);
	78	prev = NULL;
	79	for (n = 3; --n >= 0;) {
	80	for (qelt = prev ? prev->next : dpy->head;
	81	qelt; prev = qelt, qelt = qelt->next) {
	82	if (qelt->event.type >= LASTEvent
	83	\|\| !(_Xevent_to_mask[qelt->event.type] & mask)) {
	84	*event = qelt->event;
	85	_XDeq(dpy, prev, qelt);
	86	UnlockDisplay(dpy);
	87	return True;
	88	}
	89	}
	90	if (prev)
	91	qe_serial = prev->qserial_num;
	92	switch (n) {
	93	case 2:
	94	_XEventsQueued(dpy, QueuedAfterReading);
	95	break;
	96	case 1:
	97	_XFlush(dpy);
	98	break;
	99	}
	100	if (prev && prev->qserial_num != qe_serial)
	101	/* another thread has snatched this event */
	102	prev = NULL;
	103	}
	104	UnlockDisplay(dpy);
	105	return False;
	106	}