1 /* $NetBSD: v_section.c,v 1.3 2014/01/26 21:43:45 christos Exp $ */
2 /*-
3 * Copyright (c) 1992, 1993, 1994
4 * The Regents of the University of California. All rights reserved.
5 * Copyright (c) 1992, 1993, 1994, 1995, 1996
6 * Keith Bostic. All rights reserved.
7 *
8 * See the LICENSE file for redistribution information.
9 */
10
11 #include "config.h"
12
13 #include <sys/cdefs.h>
14 #if 0
15 #ifndef lint
16 static const char sccsid[] = "Id: v_section.c,v 10.10 2001/06/25 15:19:35 skimo Exp (Berkeley) Date: 2001/06/25 15:19:35 ";
17 #endif /* not lint */
18 #else
19 __RCSID("$NetBSD: v_section.c,v 1.3 2014/01/26 21:43:45 christos Exp $");
20 #endif
21
22 #include <sys/types.h>
23 #include <sys/queue.h>
24 #include <sys/time.h>
25
26 #include <bitstring.h>
27 #include <limits.h>
28 #include <stdio.h>
29 #include <string.h>
30
31 #include "../common/common.h"
32 #include "vi.h"
33
34 /*
35 * !!!
36 * In historic vi, the section commands ignored empty lines, unlike the
37 * paragraph commands, which was probably okay. However, they also moved
38 * to the start of the last line when there where no more sections instead
39 * of the end of the last line like the paragraph commands. I've changed
40 * the latter behavior to match the paragraph commands.
41 *
42 * In historic vi, a section was defined as the first character(s) of the
43 * line matching, which could be followed by anything. This implementation
44 * follows that historic practice.
45 *
46 * !!!
47 * The historic vi documentation (USD:15-10) claimed:
48 * The section commands interpret a preceding count as a different
49 * window size in which to redraw the screen at the new location,
50 * and this window size is the base size for newly drawn windows
51 * until another size is specified. This is very useful if you are
52 * on a slow terminal ...
53 *
54 * I can't get the 4BSD vi to do this, it just beeps at me. For now, a
55 * count to the section commands simply repeats the command.
56 */
57
58 /*
59 * v_sectionf -- [count]]]
60 * Move forward count sections/functions.
61 *
62 * !!!
63 * Using ]] as a motion command was a bit special, historically. It could
64 * match } as well as the usual { and section values. If it matched a { or
65 * a section, it did NOT include the matched line. If it matched a }, it
66 * did include the line. No clue why.
67 *
68 * PUBLIC: int v_sectionf __P((SCR *, VICMD *));
69 */
70 int
v_sectionf(SCR * sp,VICMD * vp)71 v_sectionf(SCR *sp, VICMD *vp)
72 {
73 db_recno_t cnt, lno;
74 size_t len;
75 CHAR_T *p;
76 const char *list, *lp;
77
78 /* Get the macro list. */
79 if ((list = O_STR(sp, O_SECTIONS)) == NULL)
80 return (1);
81
82 /*
83 * !!!
84 * If the starting cursor position is at or before any non-blank
85 * characters in the line, i.e. the movement is cutting all of the
86 * line's text, the buffer is in line mode. It's a lot easier to
87 * check here, because we know that the end is going to be the start
88 * or end of a line.
89 */
90 if (ISMOTION(vp)) {
91 if (vp->m_start.cno == 0)
92 F_SET(vp, VM_LMODE);
93 else {
94 vp->m_stop = vp->m_start;
95 vp->m_stop.cno = 0;
96 if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
97 return (1);
98 if (vp->m_start.cno <= vp->m_stop.cno)
99 F_SET(vp, VM_LMODE);
100 }
101 }
102
103 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
104 for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
105 if (len == 0)
106 continue;
107 if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) {
108 if (!--cnt) {
109 if (p[0] == '{')
110 goto adjust1;
111 goto adjust2;
112 }
113 continue;
114 }
115 /*
116 * !!!
117 * Historic documentation (USD:15-11, 4.2) said that formfeed
118 * characters (^L) in the first column delimited sections.
119 * The historic code mentions formfeed characters, but never
120 * implements them. Seems reasonable, do it.
121 */
122 if (p[0] == '\014') {
123 if (!--cnt)
124 goto adjust1;
125 continue;
126 }
127 if (p[0] != '.' || len < 2)
128 continue;
129 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
130 if (lp[0] == p[1] &&
131 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
132 !--cnt) {
133 /*
134 * !!!
135 * If not cutting this line, adjust to the end
136 * of the previous one. Otherwise, position to
137 * column 0.
138 */
139 adjust1: if (ISMOTION(vp))
140 goto ret1;
141
142 adjust2: vp->m_stop.lno = lno;
143 vp->m_stop.cno = 0;
144 goto ret2;
145 }
146 }
147
148 /* If moving forward, reached EOF, check to see if we started there. */
149 if (vp->m_start.lno == lno - 1) {
150 v_eof(sp, NULL);
151 return (1);
152 }
153
154 ret1: if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
155 return (1);
156 vp->m_stop.lno = lno;
157 vp->m_stop.cno = len ? len - 1 : 0;
158
159 /*
160 * Non-motion commands go to the end of the range. Delete and
161 * yank stay at the start of the range. Ignore others.
162 */
163 ret2: if (ISMOTION(vp)) {
164 vp->m_final = vp->m_start;
165 if (F_ISSET(vp, VM_LMODE))
166 vp->m_final.cno = 0;
167 } else
168 vp->m_final = vp->m_stop;
169 return (0);
170 }
171
172 /*
173 * v_sectionb -- [count][[
174 * Move backward count sections/functions.
175 *
176 * PUBLIC: int v_sectionb __P((SCR *, VICMD *));
177 */
178 int
v_sectionb(SCR * sp,VICMD * vp)179 v_sectionb(SCR *sp, VICMD *vp)
180 {
181 size_t len;
182 db_recno_t cnt, lno;
183 CHAR_T *p;
184 const char *list, *lp;
185
186 /* An empty file or starting from line 1 is always illegal. */
187 if (vp->m_start.lno <= 1) {
188 v_sof(sp, NULL);
189 return (1);
190 }
191
192 /* Get the macro list. */
193 if ((list = O_STR(sp, O_SECTIONS)) == NULL)
194 return (1);
195
196 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
197 for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
198 if (len == 0)
199 continue;
200 if (p[0] == '{') {
201 if (!--cnt)
202 goto adjust1;
203 continue;
204 }
205 /*
206 * !!!
207 * Historic documentation (USD:15-11, 4.2) said that formfeed
208 * characters (^L) in the first column delimited sections.
209 * The historic code mentions formfeed characters, but never
210 * implements them. Seems reasonable, do it.
211 */
212 if (p[0] == '\014') {
213 if (!--cnt)
214 goto adjust1;
215 continue;
216 }
217 if (p[0] != '.' || len < 2)
218 continue;
219 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
220 if (lp[0] == p[1] &&
221 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
222 !--cnt) {
223 adjust1: vp->m_stop.lno = lno;
224 vp->m_stop.cno = 0;
225 goto ret1;
226 }
227 }
228
229 /*
230 * If moving backward, reached SOF, which is a movement sink.
231 * We already checked for starting there.
232 */
233 vp->m_stop.lno = 1;
234 vp->m_stop.cno = 0;
235
236 /*
237 * All commands move to the end of the range.
238 *
239 * !!!
240 * Historic practice is the section cut was in line mode if it started
241 * from column 0 and was in the backward direction. Otherwise, left
242 * motion commands adjust the starting point to the character before
243 * the current one. What makes this worse is that if it cut to line
244 * mode it also went to the first non-<blank>.
245 */
246 ret1: if (vp->m_start.cno == 0) {
247 F_CLR(vp, VM_RCM_MASK);
248 F_SET(vp, VM_RCM_SETFNB);
249
250 --vp->m_start.lno;
251 F_SET(vp, VM_LMODE);
252 } else
253 --vp->m_start.cno;
254
255 vp->m_final = vp->m_stop;
256 return (0);
257 }
258