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[dragonfly.git] / contrib / nvi / ex / ex_join.c
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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[] = "@(#)ex_join.c 10.10 (Berkeley) 9/15/96";
14 #endif /* not lint */
16 #include <sys/types.h>
17 #include <sys/queue.h>
19 #include <bitstring.h>
20 #include <ctype.h>
21 #include <limits.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
26 #include "../common/common.h"
29 * ex_join -- :[line [,line]] j[oin][!] [count] [flags]
30 * Join lines.
32 * PUBLIC: int ex_join __P((SCR *, EXCMD *));
34 int
35 ex_join(sp, cmdp)
36 SCR *sp;
37 EXCMD *cmdp;
39 recno_t from, to;
40 size_t blen, clen, len, tlen;
41 int echar, extra, first;
42 char *bp, *p, *tbp;
44 NEEDFILE(sp, cmdp);
46 from = cmdp->addr1.lno;
47 to = cmdp->addr2.lno;
49 /* Check for no lines to join. */
50 if (!db_exist(sp, from + 1)) {
51 msgq(sp, M_ERR, "131|No following lines to join");
52 return (1);
55 GET_SPACE_RET(sp, bp, blen, 256);
58 * The count for the join command was off-by-one,
59 * historically, to other counts for other commands.
61 if (FL_ISSET(cmdp->iflags, E_C_COUNT))
62 ++cmdp->addr2.lno;
65 * If only a single address specified, or, the same address
66 * specified twice, the from/two addresses will be the same.
68 if (cmdp->addr1.lno == cmdp->addr2.lno)
69 ++cmdp->addr2.lno;
71 clen = tlen = 0;
72 for (first = 1,
73 from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
75 * Get next line. Historic versions of vi allowed "10J" while
76 * less than 10 lines from the end-of-file, so we do too.
78 if (db_get(sp, from, 0, &p, &len)) {
79 cmdp->addr2.lno = from - 1;
80 break;
83 /* Empty lines just go away. */
84 if (len == 0)
85 continue;
88 * Get more space if necessary. Note, tlen isn't the length
89 * of the new line, it's roughly the amount of space needed.
90 * tbp - bp is the length of the new line.
92 tlen += len + 2;
93 ADD_SPACE_RET(sp, bp, blen, tlen);
94 tbp = bp + clen;
97 * Historic practice:
99 * If force specified, join without modification.
100 * If the current line ends with whitespace, strip leading
101 * whitespace from the joined line.
102 * If the next line starts with a ), do nothing.
103 * If the current line ends with ., insert two spaces.
104 * Else, insert one space.
106 * One change -- add ? and ! to the list of characters for
107 * which we insert two spaces. I expect that POSIX 1003.2
108 * will require this as well.
110 * Echar is the last character in the last line joined.
112 extra = 0;
113 if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) {
114 if (isblank(echar))
115 for (; len && isblank(*p); --len, ++p);
116 else if (p[0] != ')') {
117 if (strchr(".?!", echar)) {
118 *tbp++ = ' ';
119 ++clen;
120 extra = 1;
122 *tbp++ = ' ';
123 ++clen;
124 for (; len && isblank(*p); --len, ++p);
128 if (len != 0) {
129 memcpy(tbp, p, len);
130 tbp += len;
131 clen += len;
132 echar = p[len - 1];
133 } else
134 echar = ' ';
137 * Historic practice for vi was to put the cursor at the first
138 * inserted whitespace character, if there was one, or the
139 * first character of the joined line, if there wasn't, or the
140 * last character of the line if joined to an empty line. If
141 * a count was specified, the cursor was moved as described
142 * for the first line joined, ignoring subsequent lines. If
143 * the join was a ':' command, the cursor was placed at the
144 * first non-blank character of the line unless the cursor was
145 * "attracted" to the end of line when the command was executed
146 * in which case it moved to the new end of line. There are
147 * probably several more special cases, but frankly, my dear,
148 * I don't give a damn. This implementation puts the cursor
149 * on the first inserted whitespace character, the first
150 * character of the joined line, or the last character of the
151 * line regardless. Note, if the cursor isn't on the joined
152 * line (possible with : commands), it is reset to the starting
153 * line.
155 if (first) {
156 sp->cno = (tbp - bp) - (1 + extra);
157 first = 0;
158 } else
159 sp->cno = (tbp - bp) - len - (1 + extra);
161 sp->lno = cmdp->addr1.lno;
163 /* Delete the joined lines. */
164 for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to)
165 if (db_delete(sp, to))
166 goto err;
168 /* If the original line changed, reset it. */
169 if (!first && db_set(sp, from, bp, tbp - bp)) {
170 err: FREE_SPACE(sp, bp, blen);
171 return (1);
173 FREE_SPACE(sp, bp, blen);
175 sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1;
176 return (0);