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Annotation of researchv9/X11/src/X.V11R1/lib/X/XMaskEvent.c, revision 1.1.1.1

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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