Oh GACK! src-clean doesn't quite work that easily since cleandist rebuilds the

[unix-history] / usr.bin / vi / nvi / v_screen.c

/*-
* Copyright (c) 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef lint
static char sccsid[] = "@(#)v_screen.c  8.8 (Berkeley) 11/28/93";
#endif /* not lint */

#include <sys/types.h>

#include "vi.h"
#include "vcmd.h"

/*
* v_screen --
*      Switch screens.
*/
int
v_screen(sp, ep, vp, fm, tm, rp)
       SCR *sp;
       EXF *ep;
       VICMDARG *vp;
       MARK *fm, *tm, *rp;
{
       /*
        * 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, "No other screen to switch to.");
               return (1);
       } else
               sp->nextdisp = sp->gp->dq.cqh_first;

       /*
        * Display the old screen's status line so the user can
        * find the screen they want.
        */
       (void)status(sp, ep, fm->lno, 0);

       /* Save the old screen's cursor information. */
       sp->frp->lno = sp->lno;
       sp->frp->cno = sp->cno;
       F_SET(sp->frp, FR_CURSORSET);

       F_SET(sp, S_SSWITCH);
       return (0);
}