minix/external/bsd/nvi/dist/ex/ex_undo.c
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

76 lines
1.5 KiB
C

/* $NetBSD: ex_undo.c,v 1.2 2013/11/22 15:52:05 christos Exp $ */
/*-
* Copyright (c) 1992, 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[] = "Id: ex_undo.c,v 10.7 2001/06/25 15:19:21 skimo Exp (Berkeley) Date: 2001/06/25 15:19:21 ";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <bitstring.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include "../common/common.h"
/*
* ex_undo -- u
* Undo the last change.
*
* PUBLIC: int ex_undo __P((SCR *, EXCMD *));
*/
int
ex_undo(SCR *sp, EXCMD *cmdp)
{
EXF *ep;
MARK m;
/*
* !!!
* Historic undo always set the previous context mark.
*/
m.lno = sp->lno;
m.cno = sp->cno;
if (mark_set(sp, ABSMARK1, &m, 1))
return (1);
/*
* !!!
* 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.
*/
ep = sp->ep;
if (!F_ISSET(ep, F_UNDO)) {
F_SET(ep, F_UNDO);
ep->lundo = FORWARD;
}
switch (ep->lundo) {
case BACKWARD:
if (log_forward(sp, &m))
return (1);
ep->lundo = FORWARD;
break;
case FORWARD:
if (log_backward(sp, &m))
return (1);
ep->lundo = BACKWARD;
break;
case NOTSET:
abort();
}
sp->lno = m.lno;
sp->cno = m.cno;
return (0);
}