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_left.c,v 10.9 2001/06/25 15:19:32 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_left -- [count]^H, [count]h
29 *	Move left by columns.
30 *
31 * PUBLIC: int v_left __P((SCR *, VICMD *));
32 */
33int
34v_left(SCR *sp, VICMD *vp)
35{
36	recno_t cnt;
37
38	/*
39	 * !!!
40	 * The ^H and h commands always failed in the first column.
41	 */
42	if (vp->m_start.cno == 0) {
43		v_sol(sp);
44		return (1);
45	}
46
47	/* Find the end of the range. */
48	cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
49	if (vp->m_start.cno > cnt)
50		vp->m_stop.cno = vp->m_start.cno - cnt;
51	else
52		vp->m_stop.cno = 0;
53
54	/*
55	 * All commands move to the end of the range.  Motion commands
56	 * adjust the starting point to the character before the current
57	 * one.
58	 */
59	if (ISMOTION(vp))
60		--vp->m_start.cno;
61	vp->m_final = vp->m_stop;
62	return (0);
63}
64
65/*
66 * v_cfirst -- [count]_
67 *	Move to the first non-blank character in a line.
68 *
69 * PUBLIC: int v_cfirst __P((SCR *, VICMD *));
70 */
71int
72v_cfirst(SCR *sp, VICMD *vp)
73{
74	recno_t cnt, lno;
75
76	/*
77	 * !!!
78	 * If the _ is a motion component, it makes the command a line motion
79	 * e.g. "d_" deletes the line.  It also means that the cursor doesn't
80	 * move.
81	 *
82	 * The _ command never failed in the first column.
83	 */
84	if (ISMOTION(vp))
85		F_SET(vp, VM_LMODE);
86	/*
87	 * !!!
88	 * Historically a specified count makes _ move down count - 1
89	 * rows, so, "3_" is the same as "2j_".
90	 */
91	cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
92	if (cnt != 1) {
93		--vp->count;
94		return (v_down(sp, vp));
95	}
96
97	/*
98	 * Move to the first non-blank.
99	 *
100	 * Can't just use RCM_SET_FNB, in case _ is used as the motion
101	 * component of another command.
102	 */
103	vp->m_stop.cno = 0;
104	if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
105		return (1);
106
107	/*
108	 * !!!
109	 * The _ command has to fail if the file is empty and we're doing
110	 * a delete.  If deleting line 1, and 0 is the first nonblank,
111	 * make the check.
112	 */
113	if (vp->m_stop.lno == 1 &&
114	    vp->m_stop.cno == 0 && ISCMD(vp->rkp, 'd')) {
115		if (db_last(sp, &lno))
116			return (1);
117		if (lno == 0) {
118			v_sol(sp);
119			return (1);
120		}
121	}
122
123	/*
124	 * Delete and non-motion commands move to the end of the range,
125	 * yank stays at the start.  Ignore others.
126	 */
127	vp->m_final =
128	    ISMOTION(vp) && ISCMD(vp->rkp, 'y') ? vp->m_start : vp->m_stop;
129	return (0);
130}
131
132/*
133 * v_first -- ^
134 *	Move to the first non-blank character in this line.
135 *
136 * PUBLIC: int v_first __P((SCR *, VICMD *));
137 */
138int
139v_first(SCR *sp, VICMD *vp)
140{
141	/*
142	 * !!!
143	 * Yielding to none in our quest for compatibility with every
144	 * historical blemish of vi, no matter how strange it might be,
145	 * we permit the user to enter a count and then ignore it.
146	 */
147
148	/*
149	 * Move to the first non-blank.
150	 *
151	 * Can't just use RCM_SET_FNB, in case ^ is used as the motion
152	 * component of another command.
153	 */
154	vp->m_stop.cno = 0;
155	if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
156		return (1);
157
158	/*
159	 * !!!
160	 * The ^ command succeeded if used as a command when the cursor was
161	 * on the first non-blank in the line, but failed if used as a motion
162	 * component in the same situation.
163	 */
164	if (ISMOTION(vp) && vp->m_start.cno == vp->m_stop.cno) {
165		v_sol(sp);
166		return (1);
167	}
168
169	/*
170	 * If moving right, non-motion commands move to the end of the range.
171	 * Delete and yank stay at the start.  Motion commands adjust the
172	 * ending point to the character before the current ending charcter.
173	 *
174	 * If moving left, all commands move to the end of the range.  Motion
175	 * commands adjust the starting point to the character before the
176	 * current starting character.
177	 */
178	if (vp->m_start.cno < vp->m_stop.cno)
179		if (ISMOTION(vp)) {
180			--vp->m_stop.cno;
181			vp->m_final = vp->m_start;
182		} else
183			vp->m_final = vp->m_stop;
184	else {
185		if (ISMOTION(vp))
186			--vp->m_start.cno;
187		vp->m_final = vp->m_stop;
188	}
189	return (0);
190}
191
192/*
193 * v_ncol -- [count]|
194 *	Move to column count or the first column on this line.  If the
195 *	requested column is past EOL, move to EOL.  The nasty part is
196 *	that we have to know character column widths to make this work.
197 *
198 * PUBLIC: int v_ncol __P((SCR *, VICMD *));
199 */
200int
201v_ncol(SCR *sp, VICMD *vp)
202{
203	if (F_ISSET(vp, VC_C1SET) && vp->count > 1) {
204		--vp->count;
205		vp->m_stop.cno =
206		    vs_colpos(sp, vp->m_start.lno, (size_t)vp->count);
207		/*
208		 * !!!
209		 * The | command succeeded if used as a command and the cursor
210		 * didn't move, but failed if used as a motion component in the
211		 * same situation.
212		 */
213		if (ISMOTION(vp) && vp->m_stop.cno == vp->m_start.cno) {
214			v_nomove(sp);
215			return (1);
216		}
217	} else {
218		/*
219		 * !!!
220		 * The | command succeeded if used as a command in column 0
221		 * without a count, but failed if used as a motion component
222		 * in the same situation.
223		 */
224		if (ISMOTION(vp) && vp->m_start.cno == 0) {
225			v_sol(sp);
226			return (1);
227		}
228		vp->m_stop.cno = 0;
229	}
230
231	/*
232	 * If moving right, non-motion commands move to the end of the range.
233	 * Delete and yank stay at the start.  Motion commands adjust the
234	 * ending point to the character before the current ending charcter.
235	 *
236	 * If moving left, all commands move to the end of the range.  Motion
237	 * commands adjust the starting point to the character before the
238	 * current starting character.
239	 */
240	if (vp->m_start.cno < vp->m_stop.cno)
241		if (ISMOTION(vp)) {
242			--vp->m_stop.cno;
243			vp->m_final = vp->m_start;
244		} else
245			vp->m_final = vp->m_stop;
246	else {
247		if (ISMOTION(vp))
248			--vp->m_start.cno;
249		vp->m_final = vp->m_stop;
250	}
251	return (0);
252}
253
254/*
255 * v_zero -- 0
256 *	Move to the first column on this line.
257 *
258 * PUBLIC: int v_zero __P((SCR *, VICMD *));
259 */
260int
261v_zero(SCR *sp, VICMD *vp)
262{
263	/*
264	 * !!!
265	 * The 0 command succeeded if used as a command in the first column
266	 * but failed if used as a motion component in the same situation.
267	 */
268	if (ISMOTION(vp) && vp->m_start.cno == 0) {
269		v_sol(sp);
270		return (1);
271	}
272
273	/*
274	 * All commands move to the end of the range.  Motion commands
275	 * adjust the starting point to the character before the current
276	 * one.
277	 */
278	vp->m_stop.cno = 0;
279	if (ISMOTION(vp))
280		--vp->m_start.cno;
281	vp->m_final = vp->m_stop;
282	return (0);
283}
284