v_right.c revision 256281 
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[] = "$Id: v_right.c,v 10.8 2001/06/25 15:19:34 skimo Exp $";
14#endif /* not lint */
15
16#include <sys/types.h>
17#include <sys/queue.h>
18#include <sys/time.h>
19
20#include <bitstring.h>
21#include <limits.h>
22#include <stdio.h>
23
24#include "../common/common.h"
25#include "vi.h"
26
27/*
28 * v_right -- [count]' ', [count]l
29 *	Move right by columns.
30 *
31 * PUBLIC: int v_right __P((SCR *, VICMD *));
32 */
33int
34v_right(SCR *sp, VICMD *vp)
35{
36	size_t len;
37	int isempty;
38
39	if (db_eget(sp, vp->m_start.lno, NULL, &len, &isempty)) {
40		if (isempty)
41			goto eol;
42		return (1);
43	}
44
45	/* It's always illegal to move right on empty lines. */
46	if (len == 0) {
47eol:		v_eol(sp, NULL);
48		return (1);
49	}
50
51	/*
52	 * Non-motion commands move to the end of the range.  Delete and
53	 * yank stay at the start.  Ignore others.  Adjust the end of the
54	 * range for motion commands.
55	 *
56	 * !!!
57	 * Historically, "[cdsy]l" worked at the end of a line.  Also,
58	 * EOL is a count sink.
59	 */
60	vp->m_stop.cno = vp->m_start.cno +
61	    (F_ISSET(vp, VC_C1SET) ? vp->count : 1);
62	if (vp->m_start.cno == len - 1 && !ISMOTION(vp)) {
63		v_eol(sp, NULL);
64		return (1);
65	}
66	if (vp->m_stop.cno >= len) {
67		vp->m_stop.cno = len - 1;
68		vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
69	} else if (ISMOTION(vp)) {
70		--vp->m_stop.cno;
71		vp->m_final = vp->m_start;
72	} else
73		vp->m_final = vp->m_stop;
74	return (0);
75}
76
77/*
78 * v_dollar -- [count]$
79 *	Move to the last column.
80 *
81 * PUBLIC: int v_dollar __P((SCR *, VICMD *));
82 */
83int
84v_dollar(SCR *sp, VICMD *vp)
85{
86	size_t len;
87	int isempty;
88
89	/*
90	 * !!!
91	 * A count moves down count - 1 rows, so, "3$" is the same as "2j$".
92	 */
93	if ((F_ISSET(vp, VC_C1SET) ? vp->count : 1) != 1) {
94		/*
95		 * !!!
96		 * Historically, if the $ is a motion, and deleting from
97		 * at or before the first non-blank of the line, it's a
98		 * line motion, and the line motion flag is set.
99		 */
100		vp->m_stop.cno = 0;
101		if (nonblank(sp, vp->m_start.lno, &vp->m_stop.cno))
102			return (1);
103		if (ISMOTION(vp) && vp->m_start.cno <= vp->m_stop.cno)
104			F_SET(vp, VM_LMODE);
105
106		--vp->count;
107		if (v_down(sp, vp))
108			return (1);
109	}
110
111	/*
112	 * !!!
113	 * Historically, it was illegal to use $ as a motion command on
114	 * an empty line.  Unfortunately, even though C was historically
115	 * aliased to c$, it (and not c$) was special cased to work on
116	 * empty lines.  Since we alias C to c$ too, we have a problem.
117	 * To fix it, we let c$ go through, on the assumption that it's
118	 * not a problem for it to work.
119	 */
120	if (db_eget(sp, vp->m_stop.lno, NULL, &len, &isempty)) {
121		if (!isempty)
122			return (1);
123		len = 0;
124	}
125
126	if (len == 0) {
127		if (ISMOTION(vp) && !ISCMD(vp->rkp, 'c')) {
128			v_eol(sp, NULL);
129			return (1);
130		}
131		return (0);
132	}
133
134	/*
135	 * Non-motion commands move to the end of the range.  Delete
136	 * and yank stay at the start.  Ignore others.
137	 */
138	vp->m_stop.cno = len ? len - 1 : 0;
139	vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
140	return (0);
141}
142