4.3BSD - /usr/src/new/X/Xlib/XAppendVertex.c

   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:     }

Defined functions