1/*-
2 * Copyright (c) 1992, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 1992, 1993, 1994, 1995, 1996
5 *	Keith Bostic.  All rights reserved.
6 *
7 * See the LICENSE file for redistribution information.
8 */
9
10#include "config.h"
11
12#ifndef lint
13static const char sccsid[] = "@(#)v_right.c	10.7 (Berkeley) 3/6/96";
14#endif /* not lint */
15
16#include <sys/types.h>
17#include <sys/queue.h>
18#include <sys/time.h>
19
20#include <bitstring.h>
21#include <limits.h>
22#include <stdio.h>
23
24#include "../common/common.h"
25#include "vi.h"
26
27/*
28 * v_right -- [count]' ', [count]l
29 *	Move right by columns.
30 *
31 * PUBLIC: int v_right __P((SCR *, VICMD *));
32 */
33int
34v_right(sp, vp)
35	SCR *sp;
36	VICMD *vp;
37{
38	size_t len;
39	int isempty;
40
41	if (db_eget(sp, vp->m_start.lno, NULL, &len, &isempty)) {
42		if (isempty)
43			goto eol;
44		return (1);
45	}
46
47	/* It's always illegal to move right on empty lines. */
48	if (len == 0) {
49eol:		v_eol(sp, NULL);
50		return (1);
51	}
52
53	/*
54	 * Non-motion commands move to the end of the range.  Delete and
55	 * yank stay at the start.  Ignore others.  Adjust the end of the
56	 * range for motion commands.
57	 *
58	 * !!!
59	 * Historically, "[cdsy]l" worked at the end of a line.  Also,
60	 * EOL is a count sink.
61	 */
62	vp->m_stop.cno = vp->m_start.cno +
63	    (F_ISSET(vp, VC_C1SET) ? vp->count : 1);
64	if (vp->m_start.cno == len - 1 && !ISMOTION(vp)) {
65		v_eol(sp, NULL);
66		return (1);
67	}
68	if (vp->m_stop.cno >= len) {
69		vp->m_stop.cno = len - 1;
70		vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
71	} else if (ISMOTION(vp)) {
72		--vp->m_stop.cno;
73		vp->m_final = vp->m_start;
74	} else
75		vp->m_final = vp->m_stop;
76	return (0);
77}
78
79/*
80 * v_dollar -- [count]$
81 *	Move to the last column.
82 *
83 * PUBLIC: int v_dollar __P((SCR *, VICMD *));
84 */
85int
86v_dollar(sp, vp)
87	SCR *sp;
88	VICMD *vp;
89{
90	size_t len;
91	int isempty;
92
93	/*
94	 * !!!
95	 * A count moves down count - 1 rows, so, "3$" is the same as "2j$".
96	 */
97	if ((F_ISSET(vp, VC_C1SET) ? vp->count : 1) != 1) {
98		/*
99		 * !!!
100		 * Historically, if the $ is a motion, and deleting from
101		 * at or before the first non-blank of the line, it's a
102		 * line motion, and the line motion flag is set.
103		 */
104		vp->m_stop.cno = 0;
105		if (nonblank(sp, vp->m_start.lno, &vp->m_stop.cno))
106			return (1);
107		if (ISMOTION(vp) && vp->m_start.cno <= vp->m_stop.cno)
108			F_SET(vp, VM_LMODE);
109
110		--vp->count;
111		if (v_down(sp, vp))
112			return (1);
113	}
114
115	/*
116	 * !!!
117	 * Historically, it was illegal to use $ as a motion command on
118	 * an empty line.  Unfortunately, even though C was historically
119	 * aliased to c$, it (and not c$) was special cased to work on
120	 * empty lines.  Since we alias C to c$ too, we have a problem.
121	 * To fix it, we let c$ go through, on the assumption that it's
122	 * not a problem for it to work.
123	 */
124	if (db_eget(sp, vp->m_stop.lno, NULL, &len, &isempty)) {
125		if (!isempty)
126			return (1);
127		len = 0;
128	}
129
130	if (len == 0) {
131		if (ISMOTION(vp) && !ISCMD(vp->rkp, 'c')) {
132			v_eol(sp, NULL);
133			return (1);
134		}
135		return (0);
136	}
137
138	/*
139	 * Non-motion commands move to the end of the range.  Delete
140	 * and yank stay at the start.  Ignore others.
141	 */
142	vp->m_stop.cno = len ? len - 1 : 0;
143	vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
144	return (0);
145}
146