sub.c revision 38161
1/* sub.c: This file contains the substitution routines for the ed 2 line editor */ 3/*- 4 * Copyright (c) 1993 Andrew Moore, Talke Studio. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 15 * 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 26 * SUCH DAMAGE. 27 */ 28 29#ifndef lint 30#if 0 31static char * const rcsid = "@(#)sub.c,v 1.1 1994/02/01 00:34:44 alm Exp"; 32#else 33static char * const rcsid = 34 "$Id: sub.c,v 1.10 1997/08/07 21:33:44 steve Exp $"; 35#endif 36#endif /* not lint */ 37 38#include "ed.h" 39 40 41char *rhbuf; /* rhs substitution buffer */ 42int rhbufsz; /* rhs substitution buffer size */ 43int rhbufi; /* rhs substitution buffer index */ 44 45/* extract_subst_tail: extract substitution tail from the command buffer */ 46int 47extract_subst_tail(flagp, np) 48 int *flagp; 49 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 */ 79char * 80extract_subst_template() 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) sprintf(errmsg, "no previous substitution"); 90 return rhbuf; 91 } 92 while (*ibufp != delimiter) { 93 REALLOC(rhbuf, rhbufsz, i + 2, NULL); 94 if ((c = rhbuf[i++] = *ibufp++) == '\n' && *ibufp == '\0') { 95 i--, ibufp--; 96 break; 97 } else if (c != '\\') 98 ; 99 else if ((rhbuf[i++] = *ibufp++) != '\n') 100 ; 101 else if (!isglobal) { 102 while ((n = get_tty_line()) == 0 || 103 (n > 0 && ibuf[n - 1] != '\n')) 104 clearerr(stdin); 105 if (n < 0) 106 return NULL; 107 } 108 } 109 REALLOC(rhbuf, rhbufsz, i + 1, NULL); 110 rhbuf[rhbufi = i] = '\0'; 111 return rhbuf; 112} 113 114 115char *rbuf; /* substitute_matching_text buffer */ 116int rbufsz; /* substitute_matching_text buffer size */ 117 118/* search_and_replace: for each line in a range, change text matching a pattern 119 according to a substitution template; return status */ 120int 121search_and_replace(pat, gflag, kth) 122 pattern_t *pat; 123 int gflag; 124 int kth; 125{ 126 undo_t *up; 127 char *txt; 128 char *eot; 129 long lc; 130 long xa = current_addr; 131 int nsubs = 0; 132 line_t *lp; 133 int len; 134 135 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) 139 return ERR; 140 else if (len) { 141 up = NULL; 142 if (delete_lines(current_addr, current_addr) < 0) 143 return ERR; 144 txt = rbuf; 145 eot = rbuf + len; 146 SPL1(); 147 do { 148 if ((txt = put_sbuf_line(txt)) == NULL) { 149 SPL0(); 150 return ERR; 151 } else if (up) 152 up->t = get_addressed_line_node(current_addr); 153 else if ((up = push_undo_stack(UADD, 154 current_addr, current_addr)) == NULL) { 155 SPL0(); 156 return ERR; 157 } 158 } while (txt != eot); 159 SPL0(); 160 nsubs++; 161 xa = current_addr; 162 } 163 } 164 current_addr = xa; 165 if (nsubs == 0 && !(gflag & GLB)) { 166 sprintf(errmsg, "no match"); 167 return ERR; 168 } else if ((gflag & (GPR | GLS | GNP)) && 169 display_lines(current_addr, current_addr, gflag) < 0) 170 return ERR; 171 return 0; 172} 173 174 175/* substitute_matching_text: replace text matched by a pattern according to 176 a substitution template; return pointer to the modified text */ 177int 178substitute_matching_text(pat, lp, gflag, kth) 179 pattern_t *pat; 180 line_t *lp; 181 int gflag; 182 int kth; 183{ 184 int off = 0; 185 int changed = 0; 186 int matchno = 0; 187 int i = 0; 188 regmatch_t rm[SE_MAX]; 189 char *txt; 190 char *eot; 191 192 if ((txt = get_sbuf_line(lp)) == NULL) 193 return ERR; 194 if (isbinary) 195 NUL_TO_NEWLINE(txt, lp->len); 196 eot = txt + lp->len; 197 if (!regexec(pat, txt, SE_MAX, rm, 0)) { 198 do { 199 if (!kth || kth == ++matchno) { 200 changed++; 201 i = rm[0].rm_so; 202 REALLOC(rbuf, rbufsz, off + i, ERR); 203 if (isbinary) 204 NEWLINE_TO_NUL(txt, rm[0].rm_eo); 205 memcpy(rbuf + off, txt, i); 206 off += i; 207 if ((off = apply_subst_template(txt, rm, off, 208 pat->re_nsub)) < 0) 209 return ERR; 210 } else { 211 i = rm[0].rm_eo; 212 REALLOC(rbuf, rbufsz, off + i, ERR); 213 if (isbinary) 214 NEWLINE_TO_NUL(txt, i); 215 memcpy(rbuf + off, txt, i); 216 off += i; 217 } 218 txt += rm[0].rm_eo; 219 } while (*txt && 220 (!changed || ((gflag & GSG) && rm[0].rm_eo)) && 221 !regexec(pat, txt, SE_MAX, rm, REG_NOTBOL)); 222 i = eot - txt; 223 REALLOC(rbuf, rbufsz, off + i + 2, ERR); 224 if (i > 0 && !rm[0].rm_eo && (gflag & GSG)) { 225 sprintf(errmsg, "infinite substitution loop"); 226 return ERR; 227 } 228 if (isbinary) 229 NEWLINE_TO_NUL(txt, i); 230 memcpy(rbuf + off, txt, i); 231 memcpy(rbuf + off + i, "\n", 2); 232 } 233 return changed ? off + i + 1 : 0; 234} 235 236 237/* apply_subst_template: modify text according to a substitution template; 238 return offset to end of modified text */ 239int 240apply_subst_template(boln, rm, off, re_nsub) 241 char *boln; 242 regmatch_t *rm; 243 int off; 244 int re_nsub; 245{ 246 int j = 0; 247 int k = 0; 248 int n; 249 char *sub = rhbuf; 250 251 for (; sub - rhbuf < rhbufi; sub++) 252 if (*sub == '&') { 253 j = rm[0].rm_so; 254 k = rm[0].rm_eo; 255 REALLOC(rbuf, rbufsz, off + k - j, ERR); 256 while (j < k) 257 rbuf[off++] = boln[j++]; 258 } else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' && 259 (n = *sub - '0') <= re_nsub) { 260 j = rm[n].rm_so; 261 k = rm[n].rm_eo; 262 REALLOC(rbuf, rbufsz, off + k - j, ERR); 263 while (j < k) 264 rbuf[off++] = boln[j++]; 265 } else { 266 REALLOC(rbuf, rbufsz, off + 1, ERR); 267 rbuf[off++] = *sub; 268 } 269 REALLOC(rbuf, rbufsz, off + 1, ERR); 270 rbuf[off] = '\0'; 271 return off; 272} 273