vi/v_screen.c

   1 /*-
   2  * Copyright (c) 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * %sccs.include.redist.c%
   6  */
   7
   8 #ifndef lint
   9 static char sccsid[] = "$Id: v_screen.c,v 8.8 1993/11/28 18:31:30 bostic Exp $ (Berkeley) $Date: 1993/11/28 18:31:30 $";
  10 #endif /* not lint */
  11
  12 #include <sys/types.h>
  13
  14 #include "vi.h"
  15 #include "vcmd.h"
  16
  17 /*
  18  * v_screen --
  19  *      Switch screens.
  20  */
  21 int
  22 v_screen(sp, ep, vp, fm, tm, rp)
  23         SCR *sp;
  24         EXF *ep;
  25         VICMDARG *vp;
  26         MARK *fm, *tm, *rp;
  27 {
  28         /*
  29          * Try for the next lower screen, or, go back to the first
  30          * screen on the stack.
  31          */
  32         if (sp->q.cqe_next != (void *)&sp->gp->dq)
  33                 sp->nextdisp = sp->q.cqe_next;
  34         else if (sp->gp->dq.cqh_first == sp) {
  35                 msgq(sp, M_ERR, "No other screen to switch to.");
  36                 return (1);
  37         } else
  38                 sp->nextdisp = sp->gp->dq.cqh_first;
  39
  40         /*
  41          * Display the old screen's status line so the user can
  42          * find the screen they want.
  43          */
  44         (void)status(sp, ep, fm->lno, 0);
  45
  46         /* Save the old screen's cursor information. */
  47         sp->frp->lno = sp->lno;
  48         sp->frp->cno = sp->cno;
  49         F_SET(sp->frp, FR_CURSORSET);
  50
  51         F_SET(sp, S_SSWITCH);
  52         return (0);
  53 }