1 /* $OpenBSD: v_section.c,v 1.7 2014/11/12 04:28:41 bentley Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (c) 1992, 1993, 1994, 1995, 1996
7 * Keith Bostic. All rights reserved.
8 *
9 * See the LICENSE file for redistribution information.
10 */
11
12 #include "config.h"
13
14 #include <sys/types.h>
15 #include <sys/queue.h>
16 #include <sys/time.h>
17
18 #include <bitstring.h>
19 #include <limits.h>
20 #include <stdio.h>
21 #include <string.h>
22
23 #include "../common/common.h"
24 #include "vi.h"
25
26 /*
27 * !!!
28 * In historic vi, the section commands ignored empty lines, unlike the
29 * paragraph commands, which was probably okay. However, they also moved
30 * to the start of the last line when there where no more sections instead
31 * of the end of the last line like the paragraph commands. I've changed
32 * the latter behavior to match the paragraph commands.
33 *
34 * In historic vi, a section was defined as the first character(s) of the
35 * line matching, which could be followed by anything. This implementation
36 * follows that historic practice.
37 *
38 * !!!
39 * The historic vi documentation (USD:15-10) claimed:
40 * The section commands interpret a preceding count as a different
41 * window size in which to redraw the screen at the new location,
42 * and this window size is the base size for newly drawn windows
43 * until another size is specified. This is very useful if you are
44 * on a slow terminal ...
45 *
46 * I can't get the 4BSD vi to do this, it just beeps at me. For now, a
47 * count to the section commands simply repeats the command.
48 */
49
50 /*
51 * v_sectionf -- [count]]]
52 * Move forward count sections/functions.
53 *
54 * !!!
55 * Using ]] as a motion command was a bit special, historically. It could
56 * match } as well as the usual { and section values. If it matched a { or
57 * a section, it did NOT include the matched line. If it matched a }, it
58 * did include the line. No clue why.
59 *
60 * PUBLIC: int v_sectionf(SCR *, VICMD *);
61 */
62 int
v_sectionf(SCR * sp,VICMD * vp)63 v_sectionf(SCR *sp, VICMD *vp)
64 {
65 recno_t cnt, lno;
66 size_t len;
67 char *p, *list, *lp;
68
69 /* Get the macro list. */
70 if ((list = O_STR(sp, O_SECTIONS)) == NULL)
71 return (1);
72
73 /*
74 * !!!
75 * If the starting cursor position is at or before any non-blank
76 * characters in the line, i.e. the movement is cutting all of the
77 * line's text, the buffer is in line mode. It's a lot easier to
78 * check here, because we know that the end is going to be the start
79 * or end of a line.
80 */
81 if (ISMOTION(vp)) {
82 if (vp->m_start.cno == 0)
83 F_SET(vp, VM_LMODE);
84 else {
85 vp->m_stop = vp->m_start;
86 vp->m_stop.cno = 0;
87 if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
88 return (1);
89 if (vp->m_start.cno <= vp->m_stop.cno)
90 F_SET(vp, VM_LMODE);
91 }
92 }
93
94 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
95 for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
96 if (len == 0)
97 continue;
98 if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) {
99 if (!--cnt) {
100 if (p[0] == '{')
101 goto adjust1;
102 goto adjust2;
103 }
104 continue;
105 }
106 /*
107 * !!!
108 * Historic documentation (USD:15-11, 4.2) said that formfeed
109 * characters (^L) in the first column delimited sections.
110 * The historic code mentions formfeed characters, but never
111 * implements them. Seems reasonable, do it.
112 */
113 if (p[0] == '\014') {
114 if (!--cnt)
115 goto adjust1;
116 continue;
117 }
118 if (p[0] != '.' || len < 2)
119 continue;
120 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
121 if (lp[0] == p[1] &&
122 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
123 !--cnt) {
124 /*
125 * !!!
126 * If not cutting this line, adjust to the end
127 * of the previous one. Otherwise, position to
128 * column 0.
129 */
130 adjust1: if (ISMOTION(vp))
131 goto ret1;
132
133 adjust2: vp->m_stop.lno = lno;
134 vp->m_stop.cno = 0;
135 goto ret2;
136 }
137 }
138
139 /* If moving forward, reached EOF, check to see if we started there. */
140 if (vp->m_start.lno == lno - 1) {
141 v_eof(sp, NULL);
142 return (1);
143 }
144
145 ret1: if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
146 return (1);
147 vp->m_stop.lno = lno;
148 vp->m_stop.cno = len ? len - 1 : 0;
149
150 /*
151 * Non-motion commands go to the end of the range. Delete and
152 * yank stay at the start of the range. Ignore others.
153 */
154 ret2: if (ISMOTION(vp)) {
155 vp->m_final = vp->m_start;
156 if (F_ISSET(vp, VM_LMODE))
157 vp->m_final.cno = 0;
158 } else
159 vp->m_final = vp->m_stop;
160 return (0);
161 }
162
163 /*
164 * v_sectionb -- [count][[
165 * Move backward count sections/functions.
166 *
167 * PUBLIC: int v_sectionb(SCR *, VICMD *);
168 */
169 int
v_sectionb(SCR * sp,VICMD * vp)170 v_sectionb(SCR *sp, VICMD *vp)
171 {
172 size_t len;
173 recno_t cnt, lno;
174 char *p, *list, *lp;
175
176 /* An empty file or starting from line 1 is always illegal. */
177 if (vp->m_start.lno <= 1) {
178 v_sof(sp, NULL);
179 return (1);
180 }
181
182 /* Get the macro list. */
183 if ((list = O_STR(sp, O_SECTIONS)) == NULL)
184 return (1);
185
186 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
187 for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
188 if (len == 0)
189 continue;
190 if (p[0] == '{') {
191 if (!--cnt)
192 goto adjust1;
193 continue;
194 }
195 /*
196 * !!!
197 * Historic documentation (USD:15-11, 4.2) said that formfeed
198 * characters (^L) in the first column delimited sections.
199 * The historic code mentions formfeed characters, but never
200 * implements them. Seems reasonable, do it.
201 */
202 if (p[0] == '\014') {
203 if (!--cnt)
204 goto adjust1;
205 continue;
206 }
207 if (p[0] != '.' || len < 2)
208 continue;
209 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
210 if (lp[0] == p[1] &&
211 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
212 !--cnt) {
213 adjust1: vp->m_stop.lno = lno;
214 vp->m_stop.cno = 0;
215 goto ret1;
216 }
217 }
218
219 /*
220 * If moving backward, reached SOF, which is a movement sink.
221 * We already checked for starting there.
222 */
223 vp->m_stop.lno = 1;
224 vp->m_stop.cno = 0;
225
226 /*
227 * All commands move to the end of the range.
228 *
229 * !!!
230 * Historic practice is the section cut was in line mode if it started
231 * from column 0 and was in the backward direction. Otherwise, left
232 * motion commands adjust the starting point to the character before
233 * the current one. What makes this worse is that if it cut to line
234 * mode it also went to the first non-<blank>.
235 */
236 ret1: if (vp->m_start.cno == 0) {
237 F_CLR(vp, VM_RCM_MASK);
238 F_SET(vp, VM_RCM_SETFNB);
239
240 --vp->m_start.lno;
241 F_SET(vp, VM_LMODE);
242 } else
243 --vp->m_start.cno;
244
245 vp->m_final = vp->m_stop;
246 return (0);
247 }
248