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Annotation of 43BSD/contrib/X/Xlib/XWindowEvent.c, revision 1.1.1.1

1.1       root        1: #include <X/mit-copyright.h>
                      2: 
                      3: /* $Header: XWindowEvent.c,v 10.4 86/02/01 15:41:46 tony Rel $ */
                      4: /* Copyright    Massachusetts Institute of Technology    1985  */
                      5: 
                      6: #include "XlibInternal.h"
                      7: 
                      8: extern _QEvent *_qfree;
                      9: 
                     10: /* 
                     11:  * Flush output and (wait for and) return the next event in the queue
                     12:  * for the given window matching one of the events in the mask.
                     13:  * Events earlier in the queue are not discarded.
                     14:  */
                     15: 
                     16: XWindowEvent (w, mask, event)
                     17:        Window w;               /* Selected window. */
                     18:        int mask;               /* Selected event mask. */
                     19:        register XEvent *event; /* XEvent to be filled in. */
                     20: {
                     21:        register Display *dpy;
                     22:        register _QEvent *prev, *qelt;
                     23: 
                     24:        dpy = _XlibCurrentDisplay;
                     25:        _XFlush (dpy);
                     26:        for (prev = NULL, qelt = dpy->head;
                     27:             qelt && (qelt->event.window != w ||
                     28:                      !(qelt->event.type & mask));
                     29:             qelt = (prev = qelt)->next) ;
                     30:        if (qelt) {
                     31:            *event = qelt->event;
                     32:            if (prev) {
                     33:                if ((prev->next = qelt->next) == NULL)
                     34:                    dpy->tail = prev;
                     35:            } else {
                     36:                if ((dpy->head = qelt->next) == NULL)
                     37:                    dpy->tail = NULL;
                     38:            }
                     39:            qelt->next = _qfree;
                     40:            _qfree = qelt;
                     41:            dpy->qlen--;
                     42:            return;
                     43:        }
                     44:        while (1) {
                     45:            _XRead (dpy, event, sizeof(XEvent));
                     46:            if (event->type == X_Error)
                     47:                _XError(dpy, (XErrorEvent *)event);
                     48:            else if ((event->window == w) && (event->type & mask))
                     49:                return;
                     50:            else
                     51:                _XEnq(dpy, event);
                     52:        }
                     53: }
                     54: 

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