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.
6 *
7 * See the LICENSE file for redistribution information.
8 */
9
10 #include "config.h"
11
12 #include <sys/types.h>
13 #include <sys/queue.h>
14 #include <sys/time.h>
15
16 #include <bitstring.h>
17 #include <ctype.h>
18 #include <limits.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22
23 #include "../common/common.h"
24
25 /*
26 * ex_join -- :[line [,line]] j[oin][!] [count] [flags]
27 * Join lines.
28 *
29 * PUBLIC: int ex_join(SCR *, EXCMD *);
30 */
31 int
ex_join(SCR * sp,EXCMD * cmdp)32 ex_join(SCR *sp, EXCMD *cmdp)
33 {
34 recno_t from, to;
35 size_t blen, clen, len, tlen;
36 int echar = 0, extra, first;
37 CHAR_T *bp, *tbp = NULL;
38 CHAR_T *p;
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, "131|No following lines to join");
48 return (1);
49 }
50
51 GET_SPACE_RETW(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 (F_ISSET(cmdp, E_ADDR_DEF) || cmdp->addrcnt == 1)
58 ++cmdp->addr2.lno;
59
60 clen = tlen = 0;
61 for (first = 1,
62 from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
63 /*
64 * Get next line. Historic versions of vi allowed "10J" while
65 * less than 10 lines from the end-of-file, so we do too.
66 */
67 if (db_get(sp, from, 0, &p, &len)) {
68 cmdp->addr2.lno = from - 1;
69 break;
70 }
71
72 /* Empty lines just go away. */
73 if (len == 0)
74 continue;
75
76 /*
77 * Get more space if necessary. Note, tlen isn't the length
78 * of the new line, it's roughly the amount of space needed.
79 * tbp - bp is the length of the new line.
80 */
81 tlen += len + 2;
82 ADD_SPACE_RETW(sp, bp, blen, tlen);
83 tbp = bp + clen;
84
85 /*
86 * Historic practice:
87 *
88 * If force specified, join without modification.
89 * If the current line ends with whitespace, strip leading
90 * whitespace from the joined line.
91 * If the next line starts with a ), do nothing.
92 * If the current line ends with ., insert two spaces.
93 * Else, insert one space.
94 *
95 * One change -- add ? and ! to the list of characters for
96 * which we insert two spaces. I expect that POSIX 1003.2
97 * will require this as well.
98 *
99 * Echar is the last character in the last line joined.
100 */
101 extra = 0;
102 if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) {
103 if (isblank(echar))
104 for (; len && isblank(*p); --len, ++p);
105 else if (p[0] != ')') {
106 if (STRCHR(L(".?!"), echar)) {
107 *tbp++ = ' ';
108 ++clen;
109 extra = 1;
110 }
111 *tbp++ = ' ';
112 ++clen;
113 for (; len && isblank(*p); --len, ++p);
114 }
115 }
116
117 if (len != 0) {
118 MEMCPY(tbp, p, len);
119 tbp += len;
120 clen += len;
121 echar = p[len - 1];
122 } else
123 echar = ' ';
124
125 /*
126 * Historic practice for vi was to put the cursor at the first
127 * inserted whitespace character, if there was one, or the
128 * first character of the joined line, if there wasn't, or the
129 * last character of the line if joined to an empty line. If
130 * a count was specified, the cursor was moved as described
131 * for the first line joined, ignoring subsequent lines. If
132 * the join was a ':' command, the cursor was placed at the
133 * first non-blank character of the line unless the cursor was
134 * "attracted" to the end of line when the command was executed
135 * in which case it moved to the new end of line. There are
136 * probably several more special cases, but frankly, my dear,
137 * I don't give a damn. This implementation puts the cursor
138 * on the first inserted whitespace character, the first
139 * character of the joined line, or the last character of the
140 * line regardless. Note, if the cursor isn't on the joined
141 * line (possible with : commands), it is reset to the starting
142 * line.
143 */
144 if (first) {
145 sp->cno = (tbp - bp) - (1 + extra);
146 first = 0;
147 } else
148 sp->cno = (tbp - bp) - len - (1 + extra);
149 }
150 sp->lno = cmdp->addr1.lno;
151
152 /* Delete the joined lines. */
153 for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to)
154 if (db_delete(sp, to))
155 goto err;
156
157 /* If the original line changed, reset it. */
158 if (!first && db_set(sp, from, bp, tbp - bp)) {
159 err: FREE_SPACEW(sp, bp, blen);
160 return (1);
161 }
162 FREE_SPACEW(sp, bp, blen);
163
164 sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1;
165 return (0);
166 }
167