source: trunk/third/nvi/vi/v_screen.c @ 14302

/*-
 * Copyright (c) 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 1993, 1994, 1995, 1996
 *      Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)v_screen.c    10.10 (Berkeley) 4/27/96";
#endif /* not lint */

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>

#include <bitstring.h>
#include <limits.h>
#include <stdio.h>

#include "../common/common.h"
#include "vi.h"

/*
 * v_screen -- ^W
 *      Switch screens.
 *
 * PUBLIC: int v_screen __P((SCR *, VICMD *));
 */
int
v_screen(sp, vp)
        SCR *sp;
        VICMD *vp;
{
        /*
         * You can't leave a colon command-line edit window -- it's not that
         * it won't work, but it gets real weird, real fast when you execute
         * a colon command out of a window that was forked from a window that's
         * now backgrounded...  You get the idea.
         */
        if (F_ISSET(sp, SC_COMEDIT)) {
                msgq(sp, M_ERR,
                    "308|Enter <CR> to execute a command, :q to exit");
                return (1);
        }
                
        /*
         * Try for the next lower screen, or, go back to the first
         * screen on the stack.
         */
        if (sp->q.cqe_next != (void *)&sp->gp->dq)
                sp->nextdisp = sp->q.cqe_next;
        else if (sp->gp->dq.cqh_first == sp) {
                msgq(sp, M_ERR, "187|No other screen to switch to");
                return (1);
        } else
                sp->nextdisp = sp->gp->dq.cqh_first;

        F_SET(sp->nextdisp, SC_STATUS);
        F_SET(sp, SC_SSWITCH | SC_STATUS);
        return (0);
}