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