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Annotation of 43BSD/contrib/X/Xlib/XAppendVertex.c, revision 1.1

1.1     ! root        1: #include <X/mit-copyright.h>
        !             2: 
        !             3: /* $Header: XAppendVertex.c,v 10.5 86/02/01 15:29:28 tony Rel $ */
        !             4: /* Copyright    Massachusetts Institute of Technology    1985  */
        !             5: 
        !             6: #include "XlibInternal.h"
        !             7: XAppendVertex (vertices, nvert)
        !             8:     Vertex vertices[];
        !             9:     int nvert;
        !            10:     {
        !            11:     register Display *dpy = _XlibCurrentDisplay;
        !            12:     register XReq *lastdraw;
        !            13:     register char *old_bufptr, *new_bufptr;
        !            14:     int nbytes;
        !            15: 
        !            16:     if ((lastdraw = (XReq*)(dpy->lastdraw)) == NULL)
        !            17:        return (0);  /* no draw command in output buffer */
        !            18: 
        !            19:     old_bufptr = dpy->bufptr;
        !            20:     /* subtract off any padding */
        !            21:     if (lastdraw->param.s[0] & 1)
        !            22:        old_bufptr -= 2;
        !            23:     new_bufptr = old_bufptr + (nbytes = nvert*sizeof(Vertex));
        !            24:     if (new_bufptr >= dpy->bufmax)
        !            25:        return (-1); /* vertices don't fit */
        !            26:     
        !            27:     /* increment number of vertices in XDraw packet */
        !            28:     lastdraw->param.s[0] += nvert;
        !            29:     bcopy (vertices, old_bufptr, nbytes);
        !            30:     /* add in padding if needed */
        !            31:     if (lastdraw->param.s[0] & 1)
        !            32:        new_bufptr += 2;
        !            33:     dpy->bufptr = new_bufptr;
        !            34:     return (nvert);
        !            35:     }

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