1 /* sub.c: This file contains the substitution routines for the ed
4 * Copyright (c) 1993 Andrew Moore, Talke Studio.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 static char * const rcsid = "@(#)sub.c,v 1.1 1994/02/01 00:34:44 alm Exp";
33 static char * const rcsid =
34 "$FreeBSD: src/bin/ed/sub.c,v 1.12 1999/08/27 23:14:15 peter Exp $";
41 char *rhbuf; /* rhs substitution buffer */
42 int rhbufsz; /* rhs substitution buffer size */
43 int rhbufi; /* rhs substitution buffer index */
45 /* extract_subst_tail: extract substitution tail from the command buffer */
47 extract_subst_tail(flagp, np)
54 if ((delimiter = *ibufp) == '\n') {
58 } else if (extract_subst_template() == NULL)
60 else if (*ibufp == '\n') {
63 } else if (*ibufp == delimiter)
65 if ('1' <= *ibufp && *ibufp <= '9') {
68 } else if (*ibufp == 'g') {
77 /* extract_subst_template: return pointer to copy of substitution template
78 in the command buffer */
80 extract_subst_template()
85 char delimiter = *ibufp++;
87 if (*ibufp == '%' && *(ibufp + 1) == delimiter) {
89 if (!rhbuf) sprintf(errmsg, "no previous substitution");
92 while (*ibufp != delimiter) {
93 REALLOC(rhbuf, rhbufsz, i + 2, NULL);
94 if ((c = rhbuf[i++] = *ibufp++) == '\n' && *ibufp == '\0') {
99 else if ((rhbuf[i++] = *ibufp++) != '\n')
101 else if (!isglobal) {
102 while ((n = get_tty_line()) == 0 ||
103 (n > 0 && ibuf[n - 1] != '\n'))
109 REALLOC(rhbuf, rhbufsz, i + 1, NULL);
110 rhbuf[rhbufi = i] = '\0';
115 char *rbuf; /* substitute_matching_text buffer */
116 int rbufsz; /* substitute_matching_text buffer size */
118 /* search_and_replace: for each line in a range, change text matching a pattern
119 according to a substitution template; return status */
121 search_and_replace(pat, gflag, kth)
130 long xa = current_addr;
135 current_addr = first_addr - 1;
136 for (lc = 0; lc <= second_addr - first_addr; lc++) {
137 lp = get_addressed_line_node(++current_addr);
138 if ((len = substitute_matching_text(pat, lp, gflag, kth)) < 0)
142 if (delete_lines(current_addr, current_addr) < 0)
148 if ((txt = put_sbuf_line(txt)) == NULL) {
152 up->t = get_addressed_line_node(current_addr);
153 else if ((up = push_undo_stack(UADD,
154 current_addr, current_addr)) == NULL) {
158 } while (txt != eot);
165 if (nsubs == 0 && !(gflag & GLB)) {
166 sprintf(errmsg, "no match");
168 } else if ((gflag & (GPR | GLS | GNP)) &&
169 display_lines(current_addr, current_addr, gflag) < 0)
175 /* substitute_matching_text: replace text matched by a pattern according to
176 a substitution template; return pointer to the modified text */
178 substitute_matching_text(pat, lp, gflag, kth)
188 regmatch_t rm[SE_MAX];
192 if ((txt = get_sbuf_line(lp)) == NULL)
195 NUL_TO_NEWLINE(txt, lp->len);
197 if (!regexec(pat, txt, SE_MAX, rm, 0)) {
199 if (!kth || kth == ++matchno) {
202 REALLOC(rbuf, rbufsz, off + i, ERR);
204 NEWLINE_TO_NUL(txt, rm[0].rm_eo);
205 memcpy(rbuf + off, txt, i);
207 if ((off = apply_subst_template(txt, rm, off,
212 REALLOC(rbuf, rbufsz, off + i, ERR);
214 NEWLINE_TO_NUL(txt, i);
215 memcpy(rbuf + off, txt, i);
220 (!changed || ((gflag & GSG) && rm[0].rm_eo)) &&
221 !regexec(pat, txt, SE_MAX, rm, REG_NOTBOL));
223 REALLOC(rbuf, rbufsz, off + i + 2, ERR);
224 if (i > 0 && !rm[0].rm_eo && (gflag & GSG)) {
225 sprintf(errmsg, "infinite substitution loop");
229 NEWLINE_TO_NUL(txt, i);
230 memcpy(rbuf + off, txt, i);
231 memcpy(rbuf + off + i, "\n", 2);
233 return changed ? off + i + 1 : 0;
237 /* apply_subst_template: modify text according to a substitution template;
238 return offset to end of modified text */
240 apply_subst_template(boln, rm, off, re_nsub)
251 for (; sub - rhbuf < rhbufi; sub++)
255 REALLOC(rbuf, rbufsz, off + k - j, ERR);
257 rbuf[off++] = boln[j++];
258 } else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' &&
259 (n = *sub - '0') <= re_nsub) {
262 REALLOC(rbuf, rbufsz, off + k - j, ERR);
264 rbuf[off++] = boln[j++];
266 REALLOC(rbuf, rbufsz, off + 1, ERR);
269 REALLOC(rbuf, rbufsz, off + 1, ERR);