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

   1 /*      $NetBSD: v_screen.c,v 1.5 2014/01/26 21:43:45 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 #include <sys/cdefs.h>
  14 #if 0
  15 #ifndef lint
  16 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 ";
  17 #endif /* not lint */
  18 #else
  19 __RCSID("$NetBSD: v_screen.c,v 1.5 2014/01/26 21:43:45 christos Exp $");
  20 #endif
  21
  22 #include <sys/types.h>
  23 #include <sys/queue.h>
  24 #include <sys/time.h>
  25
  26 #include <bitstring.h>
  27 #include <limits.h>
  28 #include <stdio.h>
  29
  30 #include "../common/common.h"
  31 #include "vi.h"
  32
  33 /*
  34  * v_screen -- ^W
  35  *      Switch screens.
  36  *
  37  * PUBLIC: int v_screen __P((SCR *, VICMD *));
  38  */
  39 int
  40 v_screen(SCR *sp, VICMD *vp)
  41 {
  42         /*
  43          * You can't leave a colon command-line edit window -- it's not that
  44          * it won't work, but it gets real weird, real fast when you execute
  45          * a colon command out of a window that was forked from a window that's
  46          * now backgrounded...  You get the idea.
  47          */
  48         if (F_ISSET(sp, SC_COMEDIT)) {
  49                 msgq(sp, M_ERR,
  50                     "308|Enter <CR> to execute a command, :q to exit");
  51                 return (1);
  52         }
  53
  54         /*
  55          * Try for the next lower screen, or, go back to the first
  56          * screen on the stack.
  57          */
  58         if (TAILQ_NEXT(sp, q) != NULL)
  59                 sp->nextdisp = TAILQ_NEXT(sp, q);
  60         else if (TAILQ_FIRST(&sp->wp->scrq) == sp) {
  61                 msgq(sp, M_ERR, "187|No other screen to switch to");
  62                 return (1);
  63         } else
  64                 sp->nextdisp = TAILQ_FIRST(&sp->wp->scrq);
  65
  66         F_SET(sp->nextdisp, SC_STATUS);
  67         F_SET(sp, SC_SSWITCH | SC_STATUS);
  68         return (0);
  69 }