1 /* $NetBSD: v_replace.c,v 1.4 2018/08/07 08:05:47 rin Exp $ */
2 /*-
3 * Copyright (c) 1992, 1993, 1994
4 * The Regents of the University of California. All rights reserved.
5 * Copyright (c) 1992, 1993, 1994, 1995, 1996
6 * Keith Bostic. All rights reserved.
7 *
8 * See the LICENSE file for redistribution information.
9 */
10
11 #include "config.h"
12
13 #include <sys/cdefs.h>
14 #if 0
15 #ifndef lint
16 static const char sccsid[] = "Id: v_replace.c,v 10.24 2001/06/25 15:19:34 skimo Exp (Berkeley) Date: 2001/06/25 15:19:34 ";
17 #endif /* not lint */
18 #else
19 __RCSID("$NetBSD: v_replace.c,v 1.4 2018/08/07 08:05:47 rin Exp $");
20 #endif
21
22 #include <sys/types.h>
23 #include <sys/queue.h>
24 #include <sys/time.h>
25
26 #include <bitstring.h>
27 #include <ctype.h>
28 #include <errno.h>
29 #include <limits.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33
34 #include "../common/common.h"
35 #include "vi.h"
36
37 /*
38 * v_replace -- [count]r<char>
39 *
40 * !!!
41 * The r command in historic vi was almost beautiful in its badness. For
42 * example, "r<erase>" and "r<word erase>" beeped the terminal and deleted
43 * a single character. "Nr<carriage return>", where N was greater than 1,
44 * inserted a single carriage return. "r<escape>" did cancel the command,
45 * but "r<literal><escape>" erased a single character. To enter a literal
46 * <literal> character, it required three <literal> characters after the
47 * command. This may not be right, but at least it's not insane.
48 *
49 * PUBLIC: int v_replace __P((SCR *, VICMD *));
50 */
51 int
v_replace(SCR * sp,VICMD * vp)52 v_replace(SCR *sp, VICMD *vp)
53 {
54 EVENT ev;
55 VI_PRIVATE *vip;
56 TEXT *tp;
57 size_t blen, len;
58 u_long cnt;
59 int quote, rval;
60 CHAR_T *bp;
61 CHAR_T *p;
62
63 vip = VIP(sp);
64
65 /*
66 * If the line doesn't exist, or it's empty, replacement isn't
67 * allowed. It's not hard to implement, but:
68 *
69 * 1: It's historic practice (vi beeped before the replacement
70 * character was even entered).
71 * 2: For consistency, this change would require that the more
72 * general case, "Nr", when the user is < N characters from
73 * the end of the line, also work, which would be a bit odd.
74 * 3: Replacing with a <newline> has somewhat odd semantics.
75 */
76 if (db_get(sp, vp->m_start.lno, DBG_FATAL, &p, &len))
77 return (1);
78 if (len == 0) {
79 msgq(sp, M_BERR, "186|No characters to replace");
80 return (1);
81 }
82
83 /*
84 * Figure out how many characters to be replace. For no particular
85 * reason (other than that the semantics of replacing the newline
86 * are confusing) only permit the replacement of the characters in
87 * the current line. I suppose we could append replacement characters
88 * to the line, but I see no compelling reason to do so. Check this
89 * before we get the character to match historic practice, where Nr
90 * failed immediately if there were less than N characters from the
91 * cursor to the end of the line.
92 */
93 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
94 vp->m_stop.lno = vp->m_start.lno;
95 vp->m_stop.cno = vp->m_start.cno + cnt - 1;
96 if (vp->m_stop.cno > len - 1) {
97 v_eol(sp, &vp->m_start);
98 return (1);
99 }
100
101 /*
102 * If it's not a repeat, reset the current mode and get a replacement
103 * character.
104 */
105 quote = 0;
106 if (!F_ISSET(vp, VC_ISDOT)) {
107 sp->showmode = SM_REPLACE;
108 if (vs_refresh(sp, 0))
109 return (1);
110 next: if (v_event_get(sp, &ev, 0, 0))
111 return (1);
112
113 switch (ev.e_event) {
114 case E_CHARACTER:
115 /*
116 * <literal_next> means escape the next character.
117 * <escape> means they changed their minds.
118 */
119 if (!quote) {
120 if (ev.e_value == K_VLNEXT) {
121 quote = 1;
122 goto next;
123 }
124 if (ev.e_value == K_ESCAPE)
125 return (0);
126 }
127 vip->rlast = ev.e_c;
128 vip->rvalue = ev.e_value;
129 break;
130 case E_ERR:
131 case E_EOF:
132 F_SET(sp, SC_EXIT_FORCE);
133 return (1);
134 case E_INTERRUPT:
135 /* <interrupt> means they changed their minds. */
136 return (0);
137 case E_WRESIZE:
138 /* <resize> interrupts the input mode. */
139 #ifdef IMCTRL
140 sp->gp->scr_imctrl(sp, IMCTRL_OFF);
141 #endif
142 v_emsg(sp, NULL, VIM_WRESIZE);
143 return (0);
144 case E_REPAINT:
145 if (v_erepaint(sp, &ev))
146 return (1);
147 goto next;
148 default:
149 v_event_err(sp, &ev);
150 return (0);
151 }
152 }
153
154 /* Copy the line. */
155 GET_SPACE_RETW(sp, bp, blen, len);
156 MEMMOVE(bp, p, len);
157 p = bp;
158
159 /*
160 * Versions of nvi before 1.57 created N new lines when they replaced
161 * N characters with <carriage-return> or <newline> characters. This
162 * is different from the historic vi, which replaced N characters with
163 * a single new line. Users complained, so we match historic practice.
164 */
165 if ((!quote && vip->rvalue == K_CR) || vip->rvalue == K_NL) {
166 /* Set return line. */
167 vp->m_stop.lno = vp->m_start.lno + 1;
168 vp->m_stop.cno = 0;
169
170 /* The first part of the current line. */
171 if (db_set(sp, vp->m_start.lno, p, vp->m_start.cno))
172 goto err_ret;
173
174 /*
175 * The rest of the current line. And, of course, now it gets
176 * tricky. If there are characters left in the line and if
177 * the autoindent edit option is set, white space after the
178 * replaced character is discarded, autoindent is applied, and
179 * the cursor moves to the last indent character.
180 */
181 p += vp->m_start.cno + cnt;
182 len -= vp->m_start.cno + cnt;
183 if (len != 0 && O_ISSET(sp, O_AUTOINDENT))
184 for (; len && ISBLANK((UCHAR_T)*p); --len, ++p);
185
186 if ((tp = text_init(sp, p, len, len)) == NULL)
187 goto err_ret;
188
189 if (len != 0 && O_ISSET(sp, O_AUTOINDENT)) {
190 if (v_txt_auto(sp, vp->m_start.lno, NULL, 0, tp))
191 goto err_ret;
192 vp->m_stop.cno = tp->ai ? tp->ai - 1 : 0;
193 } else
194 vp->m_stop.cno = 0;
195
196 vp->m_stop.cno = tp->ai ? tp->ai - 1 : 0;
197 if (db_append(sp, 1, vp->m_start.lno, tp->lb, tp->len))
198 err_ret: rval = 1;
199 else {
200 text_free(tp);
201 rval = 0;
202 }
203 } else {
204 STRSET(bp + vp->m_start.cno, vip->rlast, cnt);
205 rval = db_set(sp, vp->m_start.lno, bp, len);
206 }
207 FREE_SPACEW(sp, bp, blen);
208
209 vp->m_final = vp->m_stop;
210 return (rval);
211 }
212