external/bsd/nvi/dist/vi/v_screen.c

   1 /*      $NetBSD: v_screen.c,v 1.4 2013/11/28 03:15:20 christos Exp $    */
   2 /*-
   3  * Copyright (c) 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  */
  10
  11 #include "config.h"
  12
  13 #ifndef lint
  14 static const char sccsid[] = "Id: v_screen.c,v 10.12 2001/06/25 15:19:34 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:34 ";
  15 #endif /* not lint */
  16
  17 #include <sys/types.h>
  18 #include <sys/queue.h>
  19 #include <sys/time.h>
  20
  21 #include <bitstring.h>
  22 #include <limits.h>
  23 #include <stdio.h>
  24
  25 #include "../common/common.h"
  26 #include "vi.h"
  27
  28 /*
  29  * v_screen -- ^W
  30  *      Switch screens.
  31  *
  32  * PUBLIC: int v_screen __P((SCR *, VICMD *));
  33  */
  34 int
  35 v_screen(SCR *sp, VICMD *vp)
  36 {
  37         /*
  38          * You can't leave a colon command-line edit window -- it's not that
  39          * it won't work, but it gets real weird, real fast when you execute
  40          * a colon command out of a window that was forked from a window that's
  41          * now backgrounded...  You get the idea.
  42          */
  43         if (F_ISSET(sp, SC_COMEDIT)) {
  44                 msgq(sp, M_ERR,
  45                     "308|Enter <CR> to execute a command, :q to exit");
  46                 return (1);
  47         }
  48
  49         /*
  50          * Try for the next lower screen, or, go back to the first
  51          * screen on the stack.
  52          */
  53         if (TAILQ_NEXT(sp, q) != NULL)
  54                 sp->nextdisp = TAILQ_NEXT(sp, q);
  55         else if (TAILQ_FIRST(&sp->wp->scrq) == sp) {
  56                 msgq(sp, M_ERR, "187|No other screen to switch to");
  57                 return (1);
  58         } else
  59                 sp->nextdisp = TAILQ_FIRST(&sp->wp->scrq);
  60
  61         F_SET(sp->nextdisp, SC_STATUS);
  62         F_SET(sp, SC_SSWITCH | SC_STATUS);
  63         return (0);
  64 }