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

1.1       root        1: #include <X/mit-copyright.h>
                      2: 
                      3: /* $Header: XMaskEvent.c,v 10.4 86/02/01 15:37:05 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:  * matching one of the events in the mask.
                     13:  * Events earlier in the queue are not discarded.
                     14:  */
                     15: 
                     16: XMaskEvent (mask, event)
                     17:        int mask;               /* Selected event mask. */
                     18:        register XEvent *event; /* XEvent to be filled in. */
                     19: {
                     20:        register Display *dpy;
                     21:        register _QEvent *prev, *qelt;
                     22: 
                     23:        dpy = _XlibCurrentDisplay;
                     24:        _XFlush (dpy);
                     25:        for (prev = NULL, qelt = dpy->head;
                     26:             qelt &&  !(qelt->event.type & mask);
                     27:             qelt = (prev = qelt)->next) ;
                     28:        if (qelt) {
                     29:            *event = qelt->event;
                     30:            if (prev) {
                     31:                if ((prev->next = qelt->next) == NULL)
                     32:                    dpy->tail = prev;
                     33:            } else {
                     34:                if ((dpy->head = qelt->next) == NULL)
                     35:                    dpy->tail = NULL;
                     36:            }
                     37:            qelt->next = _qfree;
                     38:            _qfree = qelt;
                     39:            dpy->qlen--;
                     40:            return;
                     41:        }
                     42:        while (1) {
                     43:            _XRead (dpy, event, sizeof(XEvent));
                     44:            if (event->type == X_Error)
                     45:                _XError(dpy, (XErrorEvent *) event);
                     46:            else if (event->type & mask)
                     47:                return;
                     48:            else
                     49:                _XEnq(dpy, event);
                     50:        }
                     51: }
                     52: 

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