1 /* $OpenBSD: ex_append.c,v 1.14 2016/05/27 09:18:12 martijn 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
17 #include <bitstring.h>
18 #include <limits.h>
19 #include <stdio.h>
20 #include <string.h>
21 #include <unistd.h>
22
23 #include "../common/common.h"
24
25 enum which {APPEND, CHANGE, INSERT};
26
27 static int ex_aci(SCR *, EXCMD *, enum which);
28
29 /*
30 * ex_append -- :[line] a[ppend][!]
31 * Append one or more lines of new text after the specified line,
32 * or the current line if no address is specified.
33 *
34 * PUBLIC: int ex_append(SCR *, EXCMD *);
35 */
36 int
ex_append(SCR * sp,EXCMD * cmdp)37 ex_append(SCR *sp, EXCMD *cmdp)
38 {
39 return (ex_aci(sp, cmdp, APPEND));
40 }
41
42 /*
43 * ex_change -- :[line[,line]] c[hange][!] [count]
44 * Change one or more lines to the input text.
45 *
46 * PUBLIC: int ex_change(SCR *, EXCMD *);
47 */
48 int
ex_change(SCR * sp,EXCMD * cmdp)49 ex_change(SCR *sp, EXCMD *cmdp)
50 {
51 return (ex_aci(sp, cmdp, CHANGE));
52 }
53
54 /*
55 * ex_insert -- :[line] i[nsert][!]
56 * Insert one or more lines of new text before the specified line,
57 * or the current line if no address is specified.
58 *
59 * PUBLIC: int ex_insert(SCR *, EXCMD *);
60 */
61 int
ex_insert(SCR * sp,EXCMD * cmdp)62 ex_insert(SCR *sp, EXCMD *cmdp)
63 {
64 return (ex_aci(sp, cmdp, INSERT));
65 }
66
67 /*
68 * ex_aci --
69 * Append, change, insert in ex.
70 */
71 static int
ex_aci(SCR * sp,EXCMD * cmdp,enum which cmd)72 ex_aci(SCR *sp, EXCMD *cmdp, enum which cmd)
73 {
74 CHAR_T *p, *t;
75 GS *gp;
76 TEXT *tp;
77 TEXTH tiq;
78 recno_t cnt, lno;
79 size_t len;
80 u_int32_t flags;
81 int need_newline;
82
83 gp = sp->gp;
84 NEEDFILE(sp, cmdp);
85
86 /*
87 * If doing a change, replace lines for as long as possible. Then,
88 * append more lines or delete remaining lines. Changes to an empty
89 * file are appends, inserts are the same as appends to the previous
90 * line.
91 *
92 * !!!
93 * Set the address to which we'll append. We set sp->lno to this
94 * address as well so that autoindent works correctly when get text
95 * from the user.
96 */
97 lno = cmdp->addr1.lno;
98 sp->lno = lno;
99 if ((cmd == CHANGE || cmd == INSERT) && lno != 0)
100 --lno;
101
102 /*
103 * !!!
104 * If the file isn't empty, cut changes into the unnamed buffer.
105 */
106 if (cmd == CHANGE && cmdp->addr1.lno != 0 &&
107 (cut(sp, NULL, &cmdp->addr1, &cmdp->addr2, CUT_LINEMODE) ||
108 del(sp, &cmdp->addr1, &cmdp->addr2, 1)))
109 return (1);
110
111 /*
112 * !!!
113 * Anything that was left after the command separator becomes part
114 * of the inserted text. Apparently, it was common usage to enter:
115 *
116 * :g/pattern/append|stuff1
117 *
118 * and append the line of text "stuff1" to the lines containing the
119 * pattern. It was also historically legal to enter:
120 *
121 * :append|stuff1
122 * stuff2
123 * .
124 *
125 * and the text on the ex command line would be appended as well as
126 * the text inserted after it. There was an historic bug however,
127 * that the user had to enter *two* terminating lines (the '.' lines)
128 * to terminate text input mode, in this case. This whole thing
129 * could be taken too far, however. Entering:
130 *
131 * :append|stuff1\
132 * stuff2
133 * stuff3
134 * .
135 *
136 * i.e. mixing and matching the forms confused the historic vi, and,
137 * not only did it take two terminating lines to terminate text input
138 * mode, but the trailing backslashes were retained on the input. We
139 * match historic practice except that we discard the backslashes.
140 *
141 * Input lines specified on the ex command line lines are separated by
142 * <newline>s. If there is a trailing delimiter an empty line was
143 * inserted. There may also be a leading delimiter, which is ignored
144 * unless it's also a trailing delimiter. It is possible to encounter
145 * a termination line, i.e. a single '.', in a global command, but not
146 * necessary if the text insert command was the last of the global
147 * commands.
148 */
149 if (cmdp->save_cmdlen != 0) {
150 for (p = cmdp->save_cmd,
151 len = cmdp->save_cmdlen; len > 0; p = t) {
152 for (t = p; len > 0 && t[0] != '\n'; ++t, --len);
153 if (t != p || len == 0) {
154 if (F_ISSET(sp, SC_EX_GLOBAL) &&
155 t - p == 1 && p[0] == '.') {
156 ++t;
157 if (len > 0)
158 --len;
159 break;
160 }
161 if (db_append(sp, 1, lno++, p, t - p))
162 return (1);
163 }
164 if (len != 0) {
165 ++t;
166 if (--len == 0 &&
167 db_append(sp, 1, lno++, "", 0))
168 return (1);
169 }
170 }
171 /*
172 * If there's any remaining text, we're in a global, and
173 * there's more command to parse.
174 *
175 * !!!
176 * We depend on the fact that non-global commands will eat the
177 * rest of the command line as text input, and before getting
178 * any text input from the user. Otherwise, we'd have to save
179 * off the command text before or during the call to the text
180 * input function below.
181 */
182 if (len != 0)
183 cmdp->save_cmd = t;
184 cmdp->save_cmdlen = len;
185 }
186
187 if (F_ISSET(sp, SC_EX_GLOBAL)) {
188 if ((sp->lno = lno) == 0 && db_exist(sp, 1))
189 sp->lno = 1;
190 return (0);
191 }
192
193 /*
194 * If not in a global command, read from the terminal.
195 *
196 * If this code is called by vi, we want to reset the terminal and use
197 * ex's line get routine. It actually works fine if we use vi's get
198 * routine, but it doesn't look as nice. Maybe if we had a separate
199 * window or something, but getting a line at a time looks awkward.
200 * However, depending on the screen that we're using, that may not
201 * be possible.
202 */
203 if (F_ISSET(sp, SC_VI)) {
204 if (gp->scr_screen(sp, SC_EX)) {
205 ex_emsg(sp, cmdp->cmd->name, EXM_NOCANON);
206 return (1);
207 }
208
209 /* If we're still in the vi screen, move out explicitly. */
210 need_newline = !F_ISSET(sp, SC_SCR_EXWROTE);
211 F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
212 if (need_newline)
213 (void)ex_puts(sp, "\n");
214
215 /*
216 * !!!
217 * Users of historical versions of vi sometimes get confused
218 * when they enter append mode, and can't seem to get out of
219 * it. Give them an informational message.
220 */
221 (void)ex_puts(sp, "Entering ex input mode.\n");
222 (void)ex_fflush(sp);
223 }
224
225 /*
226 * Set input flags; the ! flag turns off autoindent for append,
227 * change and insert.
228 */
229 LF_INIT(TXT_DOTTERM | TXT_NUMBER);
230 if (!FL_ISSET(cmdp->iflags, E_C_FORCE) && O_ISSET(sp, O_AUTOINDENT))
231 LF_SET(TXT_AUTOINDENT);
232 if (O_ISSET(sp, O_BEAUTIFY))
233 LF_SET(TXT_BEAUTIFY);
234
235 /*
236 * This code can't use the common screen TEXTH structure (sp->tiq),
237 * as it may already be in use, e.g. ":append|s/abc/ABC/" would fail
238 * as we are only halfway through the text when the append code fires.
239 * Use a local structure instead. (The ex code would have to use a
240 * local structure except that we're guaranteed to finish remaining
241 * characters in the common TEXTH structure when they were inserted
242 * into the file, above.)
243 */
244 memset(&tiq, 0, sizeof(TEXTH));
245 TAILQ_INIT(&tiq);
246
247 if (ex_txt(sp, &tiq, 0, flags))
248 return (1);
249
250 cnt = 0;
251 TAILQ_FOREACH(tp, &tiq, q) {
252 if (db_append(sp, 1, lno++, tp->lb, tp->len))
253 return (1);
254 cnt++;
255 }
256
257 /*
258 * Set sp->lno to the final line number value (correcting for a
259 * possible 0 value) as that's historically correct for the final
260 * line value, whether or not the user entered any text.
261 */
262 if ((sp->lno = lno) == 0 && db_exist(sp, 1))
263 sp->lno = 1;
264
265 return (0);
266 }
267