diff options
Diffstat (limited to 'libX11/src/ChkIfEv.c')
| -rw-r--r-- | libX11/src/ChkIfEv.c | 167 |
1 files changed, 83 insertions, 84 deletions
diff --git a/libX11/src/ChkIfEv.c b/libX11/src/ChkIfEv.c index 5c1dd2b9b..12065638d 100644 --- a/libX11/src/ChkIfEv.c +++ b/libX11/src/ChkIfEv.c @@ -1,84 +1,83 @@ -/* - -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. - -*/ - -#define NEED_EVENTS -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif -#include "Xlibint.h" - -/* - * 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 XCheckIfEvent ( - register Display *dpy, - register XEvent *event, /* XEvent to be filled in. */ - Bool (*predicate)( - Display* /* display */, - XEvent* /* event */, - char* /* arg */ - ), /* function to call */ - char *arg) -{ - 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->qserial_num > qe_serial - && (*predicate)(dpy, &qelt->event, arg)) { - *event = qelt->event; - _XDeq(dpy, prev, qelt); - _XStoreEventCookie(dpy, event); - 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; -} +/*
+
+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.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+
+/*
+ * 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 XCheckIfEvent (
+ register Display *dpy,
+ register XEvent *event, /* XEvent to be filled in. */
+ Bool (*predicate)(
+ Display* /* display */,
+ XEvent* /* event */,
+ char* /* arg */
+ ), /* function to call */
+ char *arg)
+{
+ 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->qserial_num > qe_serial
+ && (*predicate)(dpy, &qelt->event, arg)) {
+ *event = qelt->event;
+ _XDeq(dpy, prev, qelt);
+ _XStoreEventCookie(dpy, event);
+ 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;
+}
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