contrib/nvi2/vi/v_screen.c

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