sub.c revision 1.5
1 /* $NetBSD: sub.c,v 1.5 1997/07/20 06:35:41 thorpej 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 1.5 1997/07/20 06:35:41 thorpej 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 49 extract_subst_tail(flagp, np) 50 int *flagp; 51 long *np; 52 { 53 char delimiter; 54 55 *flagp = *np = 0; 56 if ((delimiter = *ibufp) == '\n') { 57 rhbufi = 0; 58 *flagp = GPR; 59 return 0; 60 } else if (extract_subst_template() == NULL) 61 return ERR; 62 else if (*ibufp == '\n') { 63 *flagp = GPR; 64 return 0; 65 } else if (*ibufp == delimiter) 66 ibufp++; 67 if ('1' <= *ibufp && *ibufp <= '9') { 68 STRTOL(*np, ibufp); 69 return 0; 70 } else if (*ibufp == 'g') { 71 ibufp++; 72 *flagp = GSG; 73 return 0; 74 } 75 return 0; 76 } 77 78 79 /* extract_subst_template: return pointer to copy of substitution template 80 in the command buffer */ 81 char * 82 extract_subst_template() 83 { 84 int n = 0; 85 int i = 0; 86 char c; 87 char delimiter = *ibufp++; 88 89 if (*ibufp == '%' && *(ibufp + 1) == delimiter) { 90 ibufp++; 91 if (!rhbuf) sprintf(errmsg, "no previous substitution"); 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 123 search_and_replace(pat, gflag, kth) 124 pattern_t *pat; 125 int gflag; 126 int kth; 127 { 128 undo_t *up; 129 char *txt; 130 char *eot; 131 long lc; 132 long xa = current_addr; 133 int nsubs = 0; 134 line_t *lp; 135 int len; 136 137 current_addr = first_addr - 1; 138 for (lc = 0; lc <= second_addr - first_addr; lc++) { 139 lp = get_addressed_line_node(++current_addr); 140 if ((len = substitute_matching_text(pat, lp, gflag, kth)) < 0) 141 return ERR; 142 else if (len) { 143 up = NULL; 144 if (delete_lines(current_addr, current_addr) < 0) 145 return ERR; 146 txt = rbuf; 147 eot = rbuf + len; 148 SPL1(); 149 do { 150 if ((txt = put_sbuf_line(txt)) == NULL) { 151 SPL0(); 152 return ERR; 153 } else if (up) 154 up->t = get_addressed_line_node(current_addr); 155 else if ((up = push_undo_stack(UADD, 156 current_addr, current_addr)) == NULL) { 157 SPL0(); 158 return ERR; 159 } 160 } while (txt != eot); 161 SPL0(); 162 nsubs++; 163 xa = current_addr; 164 } 165 } 166 current_addr = xa; 167 if (nsubs == 0 && !(gflag & GLB)) { 168 sprintf(errmsg, "no match"); 169 return ERR; 170 } else if ((gflag & (GPR | GLS | GNP)) && 171 display_lines(current_addr, current_addr, gflag) < 0) 172 return ERR; 173 return 0; 174 } 175 176 177 /* substitute_matching_text: replace text matched by a pattern according to 178 a substitution template; return pointer to the modified text */ 179 int 180 substitute_matching_text(pat, lp, gflag, kth) 181 pattern_t *pat; 182 line_t *lp; 183 int gflag; 184 int kth; 185 { 186 int off = 0; 187 int changed = 0; 188 int matchno = 0; 189 int i = 0; 190 regmatch_t rm[SE_MAX]; 191 char *txt; 192 char *eot; 193 194 if ((txt = get_sbuf_line(lp)) == NULL) 195 return ERR; 196 if (isbinary) 197 NUL_TO_NEWLINE(txt, lp->len); 198 eot = txt + lp->len; 199 if (!regexec(pat, txt, SE_MAX, rm, 0)) { 200 do { 201 if (!kth || kth == ++matchno) { 202 changed++; 203 i = rm[0].rm_so; 204 REALLOC(rbuf, rbufsz, off + i, ERR); 205 if (isbinary) 206 NEWLINE_TO_NUL(txt, rm[0].rm_eo); 207 memcpy(rbuf + off, txt, i); 208 off += i; 209 if ((off = apply_subst_template(txt, rm, off, 210 pat->re_nsub)) < 0) 211 return ERR; 212 } else { 213 i = rm[0].rm_eo; 214 REALLOC(rbuf, rbufsz, off + i, ERR); 215 if (isbinary) 216 NEWLINE_TO_NUL(txt, i); 217 memcpy(rbuf + off, txt, i); 218 off += i; 219 } 220 txt += rm[0].rm_eo; 221 } while (*txt && (!changed || ((gflag & GSG) && rm[0].rm_eo)) 222 && !regexec(pat, txt, SE_MAX, rm, REG_NOTBOL)); 223 i = eot - txt; 224 REALLOC(rbuf, rbufsz, off + i + 2, ERR); 225 if (i > 0 && !rm[0].rm_eo && (gflag & GSG)) { 226 sprintf(errmsg, "infinite substitution loop"); 227 return ERR; 228 } 229 if (isbinary) 230 NEWLINE_TO_NUL(txt, i); 231 memcpy(rbuf + off, txt, i); 232 memcpy(rbuf + off + i, "\n", 2); 233 } 234 return changed ? off + i + 1 : 0; 235 } 236 237 238 /* apply_subst_template: modify text according to a substitution template; 239 return offset to end of modified text */ 240 int 241 apply_subst_template(boln, rm, off, re_nsub) 242 char *boln; 243 regmatch_t *rm; 244 int off; 245 int re_nsub; 246 { 247 int j = 0; 248 int k = 0; 249 int n; 250 char *sub = rhbuf; 251 252 for (; sub - rhbuf < rhbufi; sub++) 253 if (*sub == '&') { 254 j = rm[0].rm_so; 255 k = rm[0].rm_eo; 256 REALLOC(rbuf, rbufsz, off + k - j, ERR); 257 while (j < k) 258 rbuf[off++] = boln[j++]; 259 } else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' && 260 (n = *sub - '0') <= re_nsub) { 261 j = rm[n].rm_so; 262 k = rm[n].rm_eo; 263 REALLOC(rbuf, rbufsz, off + k - j, ERR); 264 while (j < k) 265 rbuf[off++] = boln[j++]; 266 } else { 267 REALLOC(rbuf, rbufsz, off + 1, ERR); 268 rbuf[off++] = *sub; 269 } 270 REALLOC(rbuf, rbufsz, off + 1, ERR); 271 rbuf[off] = '\0'; 272 return off; 273 } 274
Indexes created Thu Oct 23 22:10:10 GMT 2025