112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*-
|
|
* Copyright (c) 1992, 1993, 1994
|
|
* 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[] = "@(#)ex_undo.c 8.5 (Berkeley) 3/8/94";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <bitstring.h>
|
|
#include <limits.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <termios.h>
|
|
|
|
#include "compat.h"
|
|
#include <db.h>
|
|
#include <regex.h>
|
|
|
|
#include "vi.h"
|
|
#include "excmd.h"
|
|
|
|
/*
|
|
* ex_undol -- U
|
|
* Undo changes to this line.
|
|
*/
|
|
int
|
|
ex_undol(sp, ep, cmdp)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
EXCMDARG *cmdp;
|
|
{
|
|
if (log_setline(sp, ep))
|
|
return (1);
|
|
|
|
sp->cno = 0;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* ex_undo -- u
|
|
* Undo the last change.
|
|
*/
|
|
int
|
|
ex_undo(sp, ep, cmdp)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
EXCMDARG *cmdp;
|
|
{
|
|
MARK m;
|
|
|
|
/*
|
|
* !!!
|
|
* Multiple undo isn't available in ex, as there's no '.' command.
|
|
* Whether 'u' is undo or redo is toggled each time, unless there
|
|
* was a change since the last undo, in which case it's an undo.
|
|
*/
|
|
if (!F_ISSET(ep, F_UNDO)) {
|
|
F_SET(ep, F_UNDO);
|
|
ep->lundo = FORWARD;
|
|
}
|
|
switch (ep->lundo) {
|
|
case BACKWARD:
|
|
if (log_forward(sp, ep, &m))
|
|
return (1);
|
|
ep->lundo = FORWARD;
|
|
break;
|
|
case FORWARD:
|
|
if (log_backward(sp, ep, &m))
|
|
return (1);
|
|
ep->lundo = BACKWARD;
|
|
break;
|
|
case NOTSET:
|
|
abort();
|
|
}
|
|
sp->lno = m.lno;
|
|
sp->cno = m.cno;
|
|
return (0);
|
|
}
|