Disable line cache again and add a comment as to why it is
[nvi.git] / vi / v_left.c
blobcdfb7ab3d3fce824023eb6befcf28b077e6413e2
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.
7 * See the LICENSE file for redistribution information.
8 */
10 #include "config.h"
12 #ifndef lint
13 static const char sccsid[] = "$Id: v_left.c,v 10.8 2000/04/21 19:00:40 skimo Exp $ (Berkeley) $Date: 2000/04/21 19:00:40 $";
14 #endif /* not lint */
16 #include <sys/types.h>
17 #include <sys/queue.h>
18 #include <sys/time.h>
20 #include <bitstring.h>
21 #include <limits.h>
22 #include <stdio.h>
24 #include "../common/common.h"
25 #include "vi.h"
28 * v_left -- [count]^H, [count]h
29 * Move left by columns.
31 * PUBLIC: int v_left __P((SCR *, VICMD *));
33 int
34 v_left(sp, vp)
35 SCR *sp;
36 VICMD *vp;
38 db_recno_t cnt;
41 * !!!
42 * The ^H and h commands always failed in the first column.
44 if (vp->m_start.cno == 0) {
45 v_sol(sp);
46 return (1);
49 /* Find the end of the range. */
50 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
51 if (vp->m_start.cno > cnt)
52 vp->m_stop.cno = vp->m_start.cno - cnt;
53 else
54 vp->m_stop.cno = 0;
57 * All commands move to the end of the range. Motion commands
58 * adjust the starting point to the character before the current
59 * one.
61 if (ISMOTION(vp))
62 --vp->m_start.cno;
63 vp->m_final = vp->m_stop;
64 return (0);
68 * v_cfirst -- [count]_
69 * Move to the first non-blank character in a line.
71 * PUBLIC: int v_cfirst __P((SCR *, VICMD *));
73 int
74 v_cfirst(sp, vp)
75 SCR *sp;
76 VICMD *vp;
78 db_recno_t cnt, lno;
81 * !!!
82 * If the _ is a motion component, it makes the command a line motion
83 * e.g. "d_" deletes the line. It also means that the cursor doesn't
84 * move.
86 * The _ command never failed in the first column.
88 if (ISMOTION(vp))
89 F_SET(vp, VM_LMODE);
91 * !!!
92 * Historically a specified count makes _ move down count - 1
93 * rows, so, "3_" is the same as "2j_".
95 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
96 if (cnt != 1) {
97 --vp->count;
98 return (v_down(sp, vp));
102 * Move to the first non-blank.
104 * Can't just use RCM_SET_FNB, in case _ is used as the motion
105 * component of another command.
107 vp->m_stop.cno = 0;
108 if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
109 return (1);
112 * !!!
113 * The _ command has to fail if the file is empty and we're doing
114 * a delete. If deleting line 1, and 0 is the first nonblank,
115 * make the check.
117 if (vp->m_stop.lno == 1 &&
118 vp->m_stop.cno == 0 && ISCMD(vp->rkp, 'd')) {
119 if (db_last(sp, &lno))
120 return (1);
121 if (lno == 0) {
122 v_sol(sp);
123 return (1);
128 * Delete and non-motion commands move to the end of the range,
129 * yank stays at the start. Ignore others.
131 vp->m_final =
132 ISMOTION(vp) && ISCMD(vp->rkp, 'y') ? vp->m_start : vp->m_stop;
133 return (0);
137 * v_first -- ^
138 * Move to the first non-blank character in this line.
140 * PUBLIC: int v_first __P((SCR *, VICMD *));
143 v_first(sp, vp)
144 SCR *sp;
145 VICMD *vp;
148 * !!!
149 * Yielding to none in our quest for compatibility with every
150 * historical blemish of vi, no matter how strange it might be,
151 * we permit the user to enter a count and then ignore it.
155 * Move to the first non-blank.
157 * Can't just use RCM_SET_FNB, in case ^ is used as the motion
158 * component of another command.
160 vp->m_stop.cno = 0;
161 if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
162 return (1);
165 * !!!
166 * The ^ command succeeded if used as a command when the cursor was
167 * on the first non-blank in the line, but failed if used as a motion
168 * component in the same situation.
170 if (ISMOTION(vp) && vp->m_start.cno == vp->m_stop.cno) {
171 v_sol(sp);
172 return (1);
176 * If moving right, non-motion commands move to the end of the range.
177 * Delete and yank stay at the start. Motion commands adjust the
178 * ending point to the character before the current ending charcter.
180 * If moving left, all commands move to the end of the range. Motion
181 * commands adjust the starting point to the character before the
182 * current starting character.
184 if (vp->m_start.cno < vp->m_stop.cno)
185 if (ISMOTION(vp)) {
186 --vp->m_stop.cno;
187 vp->m_final = vp->m_start;
188 } else
189 vp->m_final = vp->m_stop;
190 else {
191 if (ISMOTION(vp))
192 --vp->m_start.cno;
193 vp->m_final = vp->m_stop;
195 return (0);
199 * v_ncol -- [count]|
200 * Move to column count or the first column on this line. If the
201 * requested column is past EOL, move to EOL. The nasty part is
202 * that we have to know character column widths to make this work.
204 * PUBLIC: int v_ncol __P((SCR *, VICMD *));
207 v_ncol(sp, vp)
208 SCR *sp;
209 VICMD *vp;
211 if (F_ISSET(vp, VC_C1SET) && vp->count > 1) {
212 --vp->count;
213 vp->m_stop.cno =
214 vs_colpos(sp, vp->m_start.lno, (size_t)vp->count);
216 * !!!
217 * The | command succeeded if used as a command and the cursor
218 * didn't move, but failed if used as a motion component in the
219 * same situation.
221 if (ISMOTION(vp) && vp->m_stop.cno == vp->m_start.cno) {
222 v_nomove(sp);
223 return (1);
225 } else {
227 * !!!
228 * The | command succeeded if used as a command in column 0
229 * without a count, but failed if used as a motion component
230 * in the same situation.
232 if (ISMOTION(vp) && vp->m_start.cno == 0) {
233 v_sol(sp);
234 return (1);
236 vp->m_stop.cno = 0;
240 * If moving right, non-motion commands move to the end of the range.
241 * Delete and yank stay at the start. Motion commands adjust the
242 * ending point to the character before the current ending charcter.
244 * If moving left, all commands move to the end of the range. Motion
245 * commands adjust the starting point to the character before the
246 * current starting character.
248 if (vp->m_start.cno < vp->m_stop.cno)
249 if (ISMOTION(vp)) {
250 --vp->m_stop.cno;
251 vp->m_final = vp->m_start;
252 } else
253 vp->m_final = vp->m_stop;
254 else {
255 if (ISMOTION(vp))
256 --vp->m_start.cno;
257 vp->m_final = vp->m_stop;
259 return (0);
263 * v_zero -- 0
264 * Move to the first column on this line.
266 * PUBLIC: int v_zero __P((SCR *, VICMD *));
269 v_zero(sp, vp)
270 SCR *sp;
271 VICMD *vp;
274 * !!!
275 * The 0 command succeeded if used as a command in the first column
276 * but failed if used as a motion component in the same situation.
278 if (ISMOTION(vp) && vp->m_start.cno == 0) {
279 v_sol(sp);
280 return (1);
284 * All commands move to the end of the range. Motion commands
285 * adjust the starting point to the character before the current
286 * one.
288 vp->m_stop.cno = 0;
289 if (ISMOTION(vp))
290 --vp->m_start.cno;
291 vp->m_final = vp->m_stop;
292 return (0);