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

1.1     ! root        1: #include <X/mit-copyright.h>
        !             2: 
        !             3: /* $Header: XPeekEvent.c,v 10.5 86/04/22 15:21:50 jg Rel $ */
        !             4: /* Copyright    Massachusetts Institute of Technology    1985  */
        !             5: 
        !             6: #include "XlibInternal.h"
        !             7: 
        !             8: extern _QEvent *_qfree;
        !             9: 
        !            10: /* Flush output and (wait for and) return the next event in the queue,
        !            11: *  BUT do not remove it from the queue.
        !            12: */
        !            13: 
        !            14: XPeekEvent (event)
        !            15:        register XEvent *event;
        !            16: {
        !            17:        register _QEvent *qelt;
        !            18:        register Display *dpy = _XlibCurrentDisplay;
        !            19:        
        !            20:        _XFlush (dpy);
        !            21:        if (qelt = dpy->head) {
        !            22:            *event = qelt->event;
        !            23:            return;
        !            24:            }
        !            25: 
        !            26:        while (1) {
        !            27:            _XRead (dpy, (char *)event, sizeof(XEvent));
        !            28:            if (event->type == X_Error)
        !            29:                _XError (dpy, (XErrorEvent *) event);
        !            30:            else {  /* it's an event packet */
        !            31:                _XEnq (dpy, event);
        !            32:                return;
        !            33:                }
        !            34:        }
        !            35: }
        !            36: 

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