1 /* $NetBSD: sub.c,v 1.7 2014/03/23 05:06:42 dholland Exp $ */
2
3 /* sub.c: This file contains the substitution routines for the ed
4 line editor */
5 /*-
6 * Copyright (c) 1993 Andrew Moore, Talke Studio.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 #ifndef lint
33 #if 0
34 static char *rcsid = "@(#)sub.c,v 1.1 1994/02/01 00:34:44 alm Exp";
35 #else
36 __RCSID("$NetBSD: sub.c,v 1.7 2014/03/23 05:06:42 dholland Exp $");
37 #endif
38 #endif /* not lint */
39
40 #include "ed.h"
41
42
43 char *rhbuf; /* rhs substitution buffer */
44 int rhbufsz; /* rhs substitution buffer size */
45 int rhbufi; /* rhs substitution buffer index */
46
47 /* extract_subst_tail: extract substitution tail from the command buffer */
48 int
extract_subst_tail(int * flagp,long * np)49 extract_subst_tail(int *flagp, long *np)
50 {
51 char delimiter;
52
53 *flagp = *np = 0;
54 if ((delimiter = *ibufp) == '\n') {
55 rhbufi = 0;
56 *flagp = GPR;
57 return 0;
58 } else if (extract_subst_template() == NULL)
59 return ERR;
60 else if (*ibufp == '\n') {
61 *flagp = GPR;
62 return 0;
63 } else if (*ibufp == delimiter)
64 ibufp++;
65 if ('1' <= *ibufp && *ibufp <= '9') {
66 STRTOL(*np, ibufp);
67 return 0;
68 } else if (*ibufp == 'g') {
69 ibufp++;
70 *flagp = GSG;
71 return 0;
72 }
73 return 0;
74 }
75
76
77 /* extract_subst_template: return pointer to copy of substitution template
78 in the command buffer */
79 char *
extract_subst_template(void)80 extract_subst_template(void)
81 {
82 int n = 0;
83 int i = 0;
84 char c;
85 char delimiter = *ibufp++;
86
87 if (*ibufp == '%' && *(ibufp + 1) == delimiter) {
88 ibufp++;
89 if (!rhbuf) {
90 seterrmsg("no previous substitution");
91 }
92 return rhbuf;
93 }
94 while (*ibufp != delimiter) {
95 REALLOC(rhbuf, rhbufsz, i + 2, NULL);
96 if ((c = rhbuf[i++] = *ibufp++) == '\n' && *ibufp == '\0') {
97 i--, ibufp--;
98 break;
99 } else if (c != '\\')
100 ;
101 else if ((rhbuf[i++] = *ibufp++) != '\n')
102 ;
103 else if (!isglobal) {
104 while ((n = get_tty_line()) == 0 ||
105 (n > 0 && ibuf[n - 1] != '\n'))
106 clearerr(stdin);
107 if (n < 0)
108 return NULL;
109 }
110 }
111 REALLOC(rhbuf, rhbufsz, i + 1, NULL);
112 rhbuf[rhbufi = i] = '\0';
113 return rhbuf;
114 }
115
116
117 char *rbuf; /* substitute_matching_text buffer */
118 int rbufsz; /* substitute_matching_text buffer size */
119
120 /* search_and_replace: for each line in a range, change text matching a pattern
121 according to a substitution template; return status */
122 int
search_and_replace(pattern_t * pat,int gflag,int kth)123 search_and_replace(pattern_t *pat, int gflag, int kth)
124 {
125 undo_t *up;
126 char *txt;
127 char *eot;
128 long lc;
129 long xa = current_addr;
130 int nsubs = 0;
131 line_t *lp;
132 int len;
133
134 current_addr = first_addr - 1;
135 for (lc = 0; lc <= second_addr - first_addr; lc++) {
136 lp = get_addressed_line_node(++current_addr);
137 if ((len = substitute_matching_text(pat, lp, gflag, kth)) < 0)
138 return ERR;
139 else if (len) {
140 up = NULL;
141 if (delete_lines(current_addr, current_addr) < 0)
142 return ERR;
143 txt = rbuf;
144 eot = rbuf + len;
145 SPL1();
146 do {
147 if ((txt = put_sbuf_line(txt)) == NULL) {
148 SPL0();
149 return ERR;
150 } else if (up)
151 up->t = get_addressed_line_node(current_addr);
152 else if ((up = push_undo_stack(UADD,
153 current_addr, current_addr)) == NULL) {
154 SPL0();
155 return ERR;
156 }
157 } while (txt != eot);
158 SPL0();
159 nsubs++;
160 xa = current_addr;
161 }
162 }
163 current_addr = xa;
164 if (nsubs == 0 && !(gflag & GLB)) {
165 seterrmsg("no match");
166 return ERR;
167 } else if ((gflag & (GPR | GLS | GNP)) &&
168 display_lines(current_addr, current_addr, gflag) < 0)
169 return ERR;
170 return 0;
171 }
172
173
174 /* substitute_matching_text: replace text matched by a pattern according to
175 a substitution template; return pointer to the modified text */
176 int
substitute_matching_text(pattern_t * pat,line_t * lp,int gflag,int kth)177 substitute_matching_text(pattern_t *pat, line_t *lp, int gflag, int kth)
178 {
179 int off = 0;
180 int changed = 0;
181 int matchno = 0;
182 int i = 0;
183 regmatch_t rm[SE_MAX];
184 char *txt;
185 char *eot;
186
187 if ((txt = get_sbuf_line(lp)) == NULL)
188 return ERR;
189 if (isbinary)
190 NUL_TO_NEWLINE(txt, lp->len);
191 eot = txt + lp->len;
192 if (!regexec(pat, txt, SE_MAX, rm, 0)) {
193 do {
194 if (!kth || kth == ++matchno) {
195 changed++;
196 i = rm[0].rm_so;
197 REALLOC(rbuf, rbufsz, off + i, ERR);
198 if (isbinary)
199 NEWLINE_TO_NUL(txt, rm[0].rm_eo);
200 memcpy(rbuf + off, txt, i);
201 off += i;
202 if ((off = apply_subst_template(txt, rm, off,
203 pat->re_nsub)) < 0)
204 return ERR;
205 } else {
206 i = rm[0].rm_eo;
207 REALLOC(rbuf, rbufsz, off + i, ERR);
208 if (isbinary)
209 NEWLINE_TO_NUL(txt, i);
210 memcpy(rbuf + off, txt, i);
211 off += i;
212 }
213 txt += rm[0].rm_eo;
214 } while (*txt && (!changed || ((gflag & GSG) && rm[0].rm_eo))
215 && !regexec(pat, txt, SE_MAX, rm, REG_NOTBOL));
216 i = eot - txt;
217 REALLOC(rbuf, rbufsz, off + i + 2, ERR);
218 if (i > 0 && !rm[0].rm_eo && (gflag & GSG)) {
219 seterrmsg("infinite substitution loop");
220 return ERR;
221 }
222 if (isbinary)
223 NEWLINE_TO_NUL(txt, i);
224 memcpy(rbuf + off, txt, i);
225 memcpy(rbuf + off + i, "\n", 2);
226 }
227 return changed ? off + i + 1 : 0;
228 }
229
230
231 /* apply_subst_template: modify text according to a substitution template;
232 return offset to end of modified text */
233 int
apply_subst_template(char * boln,regmatch_t * rm,int off,int re_nsub)234 apply_subst_template(char *boln, regmatch_t *rm, int off, int re_nsub)
235 {
236 int j = 0;
237 int k = 0;
238 int n;
239 char *sub = rhbuf;
240
241 for (; sub - rhbuf < rhbufi; sub++)
242 if (*sub == '&') {
243 j = rm[0].rm_so;
244 k = rm[0].rm_eo;
245 REALLOC(rbuf, rbufsz, off + k - j, ERR);
246 while (j < k)
247 rbuf[off++] = boln[j++];
248 } else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' &&
249 (n = *sub - '0') <= re_nsub) {
250 j = rm[n].rm_so;
251 k = rm[n].rm_eo;
252 REALLOC(rbuf, rbufsz, off + k - j, ERR);
253 while (j < k)
254 rbuf[off++] = boln[j++];
255 } else {
256 REALLOC(rbuf, rbufsz, off + 1, ERR);
257 rbuf[off++] = *sub;
258 }
259 REALLOC(rbuf, rbufsz, off + 1, ERR);
260 rbuf[off] = '\0';
261 return off;
262 }
263