1 /* $OpenBSD: ex_join.c,v 1.8 2016/01/06 22:28:52 millert 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 <ctype.h>
19 #include <limits.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23
24 #include "../common/common.h"
25
26 /*
27 * ex_join -- :[line [,line]] j[oin][!] [count] [flags]
28 * Join lines.
29 *
30 * PUBLIC: int ex_join(SCR *, EXCMD *);
31 */
32 int
ex_join(SCR * sp,EXCMD * cmdp)33 ex_join(SCR *sp, EXCMD *cmdp)
34 {
35 recno_t from, to;
36 size_t blen, clen, len, tlen;
37 int echar, extra, first;
38 char *bp, *p, *tbp;
39
40 NEEDFILE(sp, cmdp);
41
42 from = cmdp->addr1.lno;
43 to = cmdp->addr2.lno;
44
45 /* Check for no lines to join. */
46 if (!db_exist(sp, from + 1)) {
47 msgq(sp, M_ERR, "No following lines to join");
48 return (1);
49 }
50
51 GET_SPACE_RET(sp, bp, blen, 256);
52
53 /*
54 * The count for the join command was off-by-one,
55 * historically, to other counts for other commands.
56 */
57 if (FL_ISSET(cmdp->iflags, E_C_COUNT))
58 ++cmdp->addr2.lno;
59
60 /*
61 * If only a single address specified, or, the same address
62 * specified twice, the from/two addresses will be the same.
63 */
64 if (cmdp->addr1.lno == cmdp->addr2.lno)
65 ++cmdp->addr2.lno;
66
67 clen = tlen = 0;
68 for (first = 1,
69 from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
70 /*
71 * Get next line. Historic versions of vi allowed "10J" while
72 * less than 10 lines from the end-of-file, so we do too.
73 */
74 if (db_get(sp, from, 0, &p, &len)) {
75 cmdp->addr2.lno = from - 1;
76 break;
77 }
78
79 /* Empty lines just go away. */
80 if (len == 0)
81 continue;
82
83 /*
84 * Get more space if necessary. Note, tlen isn't the length
85 * of the new line, it's roughly the amount of space needed.
86 * tbp - bp is the length of the new line.
87 */
88 tlen += len + 2;
89 ADD_SPACE_RET(sp, bp, blen, tlen);
90 tbp = bp + clen;
91
92 /*
93 * Historic practice:
94 *
95 * If force specified, join without modification.
96 * If the current line ends with whitespace, strip leading
97 * whitespace from the joined line.
98 * If the next line starts with a ), do nothing.
99 * If the current line ends with ., insert two spaces.
100 * Else, insert one space.
101 *
102 * One change -- add ? and ! to the list of characters for
103 * which we insert two spaces. I expect that POSIX 1003.2
104 * will require this as well.
105 *
106 * Echar is the last character in the last line joined.
107 */
108 extra = 0;
109 if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) {
110 if (isblank(echar))
111 for (; len && isblank(*p); --len, ++p);
112 else if (p[0] != ')') {
113 if (strchr(".?!", echar)) {
114 *tbp++ = ' ';
115 ++clen;
116 extra = 1;
117 }
118 *tbp++ = ' ';
119 ++clen;
120 for (; len && isblank(*p); --len, ++p);
121 }
122 }
123
124 if (len != 0) {
125 memcpy(tbp, p, len);
126 tbp += len;
127 clen += len;
128 echar = p[len - 1];
129 } else
130 echar = ' ';
131
132 /*
133 * Historic practice for vi was to put the cursor at the first
134 * inserted whitespace character, if there was one, or the
135 * first character of the joined line, if there wasn't, or the
136 * last character of the line if joined to an empty line. If
137 * a count was specified, the cursor was moved as described
138 * for the first line joined, ignoring subsequent lines. If
139 * the join was a ':' command, the cursor was placed at the
140 * first non-blank character of the line unless the cursor was
141 * "attracted" to the end of line when the command was executed
142 * in which case it moved to the new end of line. There are
143 * probably several more special cases, but frankly, my dear,
144 * I don't give a damn. This implementation puts the cursor
145 * on the first inserted whitespace character, the first
146 * character of the joined line, or the last character of the
147 * line regardless. Note, if the cursor isn't on the joined
148 * line (possible with : commands), it is reset to the starting
149 * line.
150 */
151 if (first) {
152 sp->cno = (tbp - bp) - (1 + extra);
153 first = 0;
154 } else
155 sp->cno = (tbp - bp) - len - (1 + extra);
156 }
157 sp->lno = cmdp->addr1.lno;
158
159 /* Delete the joined lines. */
160 for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to)
161 if (db_delete(sp, to))
162 goto err;
163
164 /* If the original line changed, reset it. */
165 if (!first && db_set(sp, from, bp, tbp - bp)) {
166 err: FREE_SPACE(sp, bp, blen);
167 return (1);
168 }
169 FREE_SPACE(sp, bp, blen);
170
171 sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1;
172 return (0);
173 }
174