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Annotation of researchv9/X11/src/X.V11R1/lib/X/XMaskEvent.c, revision 1.1

1.1     ! root        1: #include "copyright.h"
        !             2: 
        !             3: /* $Header: XMaskEvent.c,v 11.14 87/09/11 08:05:11 toddb Exp $ */
        !             4: /* Copyright    Massachusetts Institute of Technology    1986  */
        !             5: 
        !             6: #define NEED_EVENTS
        !             7: #include "Xlibint.h"
        !             8: 
        !             9: extern _XQEvent *_qfree;
        !            10: extern long _event_to_mask[];
        !            11: 
        !            12: /* 
        !            13:  * Flush output and (wait for and) return the next event in the queue
        !            14:  * matching one of the events in the mask.
        !            15:  * Events earlier in the queue are not discarded.
        !            16:  */
        !            17: 
        !            18: XMaskEvent (dpy, mask, event)
        !            19:        register Display *dpy;
        !            20:        unsigned long mask;             /* Selected event mask. */
        !            21:        register XEvent *event; /* XEvent to be filled in. */
        !            22: {
        !            23:        register _XQEvent *prev, *qelt;
        !            24: 
        !            25:        LockDisplay(dpy);
        !            26:        _XFlush (dpy);
        !            27:        for (prev = NULL, qelt = dpy->head;
        !            28:             qelt &&  !(_event_to_mask[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:            UnlockDisplay(dpy);
        !            43:            return;
        !            44:        }
        !            45:        while (1) {
        !            46:            xEvent pe;          /* wire protocol event */
        !            47:            _XRead (dpy, (char *) &pe, (long)sizeof(xEvent));
        !            48:            (*dpy->event_vec[pe.u.u.type & 0177])(dpy, event, &pe);
        !            49:            if (event->type == X_Error)
        !            50:                _XError(dpy, (xError *) &pe);
        !            51:            else if (_event_to_mask[event->type] & mask) {
        !            52:                UnlockDisplay (dpy);
        !            53:                return;
        !            54:                }
        !            55:            else
        !            56:                _XEnq(dpy, &pe);
        !            57:        }
        !            58: }
        !            59: 

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