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Annotation of 43BSDTahoe/new/X/Xlib/XChkMaskEvent.c, revision 1.1

1.1     ! root        1: #include <X/mit-copyright.h>
        !             2: 
        !             3: /* $Header: XChkMaskEvent.c,v 10.1 86/03/28 11:28:22 jg Rel $ */
        !             4: /* Copyright    Massachusetts Institute of Technology    1985  */
        !             5: 
        !             6: #include "XlibInternal.h"
        !             7: 
        !             8: extern _QEvent *_qfree;
        !             9: 
        !            10: /* 
        !            11:  * Flush output and return the next event in the queue
        !            12:  * matching one of the events in the mask if there is one.
        !            13:  * Return whether such an event was found.
        !            14:  * Events earlier in the queue are not discarded.
        !            15:  */
        !            16: 
        !            17: int XCheckMaskEvent (mask, event)
        !            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.type & mask);
        !            28:             qelt = (prev = qelt)->next) ;
        !            29:        if (qelt) {
        !            30:            *event = qelt->event;
        !            31:            if (prev) {
        !            32:                if ((prev->next = qelt->next) == NULL)
        !            33:                    dpy->tail = prev;
        !            34:            } else {
        !            35:                if ((dpy->head = qelt->next) == NULL)
        !            36:                    dpy->tail = NULL;
        !            37:            }
        !            38:            qelt->next = _qfree;
        !            39:            _qfree = qelt;
        !            40:            dpy->qlen--;
        !            41:            return 1;
        !            42:        } else return 0;
        !            43: }

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