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