contrib/nvi/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[] = "@(#)v_screen.c    10.10 (Berkeley) 4/27/96";
  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 __P((SCR *, VICMD *));
  32  */
  33 int
  34 v_screen(sp, vp)
  35         SCR *sp;
  36         VICMD *vp;
  37 {
  38         /*
  39          * You can't leave a colon command-line edit window -- it's not that
  40          * it won't work, but it gets real weird, real fast when you execute
  41          * a colon command out of a window that was forked from a window that's
  42          * now backgrounded...  You get the idea.
  43          */
  44         if (F_ISSET(sp, SC_COMEDIT)) {
  45                 msgq(sp, M_ERR,
  46                     "308|Enter <CR> to execute a command, :q to exit");
  47                 return (1);
  48         }
  49
  50         /*
  51          * Try for the next lower screen, or, go back to the first
  52          * screen on the stack.
  53          */
  54         if (sp->q.cqe_next != (void *)&sp->gp->dq)
  55                 sp->nextdisp = sp->q.cqe_next;
  56         else if (sp->gp->dq.cqh_first == sp) {
  57                 msgq(sp, M_ERR, "187|No other screen to switch to");
  58                 return (1);
  59         } else
  60                 sp->nextdisp = sp->gp->dq.cqh_first;
  61
  62         F_SET(sp->nextdisp, SC_STATUS);
  63         F_SET(sp, SC_SSWITCH | SC_STATUS);
  64         return (0);
  65 }