GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/vi/build/../ex/ex_undo.c Lines: 0 20 0.0 %
Date: 2017-11-13 Branches: 0 12 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: ex_undo.c,v 1.6 2014/11/12 04:28:41 bentley Exp $	*/
2
3
/*-
4
 * Copyright (c) 1992, 1993, 1994
5
 *	The Regents of the University of California.  All rights reserved.
6
 * Copyright (c) 1992, 1993, 1994, 1995, 1996
7
 *	Keith Bostic.  All rights reserved.
8
 *
9
 * See the LICENSE file for redistribution information.
10
 */
11
12
#include "config.h"
13
14
#include <sys/types.h>
15
#include <sys/queue.h>
16
17
#include <bitstring.h>
18
#include <limits.h>
19
#include <stdio.h>
20
#include <stdlib.h>
21
22
#include "../common/common.h"
23
24
/*
25
 * ex_undo -- u
26
 *	Undo the last change.
27
 *
28
 * PUBLIC: int ex_undo(SCR *, EXCMD *);
29
 */
30
int
31
ex_undo(SCR *sp, EXCMD *cmdp)
32
{
33
	EXF *ep;
34
	MARK m;
35
36
	/*
37
	 * !!!
38
	 * Historic undo always set the previous context mark.
39
	 */
40
	m.lno = sp->lno;
41
	m.cno = sp->cno;
42
	if (mark_set(sp, ABSMARK1, &m, 1))
43
		return (1);
44
45
	/*
46
	 * !!!
47
	 * Multiple undo isn't available in ex, as there's no '.' command.
48
	 * Whether 'u' is undo or redo is toggled each time, unless there
49
	 * was a change since the last undo, in which case it's an undo.
50
	 */
51
	ep = sp->ep;
52
	if (!F_ISSET(ep, F_UNDO)) {
53
		F_SET(ep, F_UNDO);
54
		ep->lundo = FORWARD;
55
	}
56
	switch (ep->lundo) {
57
	case BACKWARD:
58
		if (log_forward(sp, &m))
59
			return (1);
60
		ep->lundo = FORWARD;
61
		break;
62
	case FORWARD:
63
		if (log_backward(sp, &m))
64
			return (1);
65
		ep->lundo = BACKWARD;
66
		break;
67
	case NOTSET:
68
		abort();
69
	}
70
	sp->lno = m.lno;
71
	sp->cno = m.cno;
72
	return (0);
73
}