sub.c revision 3044
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 * $Id$ 29 */ 30 31#ifndef lint 32static char *rcsid = "@(#)sub.c,v 1.1 1994/02/01 00:34:44 alm Exp"; 33#endif /* not lint */ 34 35#include "ed.h" 36 37 38char *rhbuf; /* rhs substitution buffer */ 39int rhbufsz; /* rhs substitution buffer size */ 40int rhbufi; /* rhs substitution buffer index */ 41 42/* extract_subst_tail: extract substitution tail from the command buffer */ 43int 44extract_subst_tail(flagp, np) 45 int *flagp; 46 int *np; 47{ 48 char delimiter; 49 50 *flagp = *np = 0; 51 if ((delimiter = *ibufp) == '\n') { 52 rhbufi = 0; 53 *flagp = GPR; 54 return 0; 55 } else if (extract_subst_template() == NULL) 56 return ERR; 57 else if (*ibufp == '\n') { 58 *flagp = GPR; 59 return 0; 60 } else if (*ibufp == delimiter) 61 ibufp++; 62 if ('1' <= *ibufp && *ibufp <= '9') { 63 STRTOL(*np, ibufp); 64 return 0; 65 } else if (*ibufp == 'g') { 66 ibufp++; 67 *flagp = GSG; 68 return 0; 69 } 70 return 0; 71} 72 73 74/* extract_subst_template: return pointer to copy of substitution template 75 in the command buffer */ 76char * 77extract_subst_template() 78{ 79 int n = 0; 80 int i = 0; 81 char c; 82 char delimiter = *ibufp++; 83 84 if (*ibufp == '%' && *(ibufp + 1) == delimiter) { 85 ibufp++; 86 if (!rhbuf) sprintf(errmsg, "no previous substitution"); 87 return rhbuf; 88 } 89 while (*ibufp != delimiter) { 90 REALLOC(rhbuf, rhbufsz, i + 2, NULL); 91 if ((c = rhbuf[i++] = *ibufp++) == '\n' && *ibufp == '\0') { 92 i--, ibufp--; 93 break; 94 } else if (c != '\\') 95 ; 96 else if ((rhbuf[i++] = *ibufp++) != '\n') 97 ; 98 else if (!isglobal) { 99 while ((n = get_tty_line()) == 0 || 100 n > 0 && ibuf[n - 1] != '\n') 101 clearerr(stdin); 102 if (n < 0) 103 return NULL; 104 } 105 } 106 REALLOC(rhbuf, rhbufsz, i + 1, NULL); 107 rhbuf[rhbufi = i] = '\0'; 108 return rhbuf; 109} 110 111 112char *rbuf; /* substitute_matching_text buffer */ 113int rbufsz; /* substitute_matching_text buffer size */ 114 115/* search_and_replace: for each line in a range, change text matching a pattern 116 according to a substitution template; return status */ 117int 118search_and_replace(pat, gflag, kth) 119 pattern_t *pat; 120 int gflag; 121 int kth; 122{ 123 undo_t *up; 124 char *txt; 125 char *eot; 126 long lc; 127 int nsubs = 0; 128 line_t *lp; 129 int len; 130 131 current_addr = first_addr - 1; 132 for (lc = 0; lc <= second_addr - first_addr; lc++) { 133 lp = get_addressed_line_node(++current_addr); 134 if ((len = substitute_matching_text(pat, lp, gflag, kth)) < 0) 135 return ERR; 136 else if (len) { 137 up = NULL; 138 if (delete_lines(current_addr, current_addr) < 0) 139 return ERR; 140 txt = rbuf; 141 eot = rbuf + len; 142 SPL1(); 143 do { 144 if ((txt = put_sbuf_line(txt)) == NULL) { 145 SPL0(); 146 return ERR; 147 } else if (up) 148 up->t = get_addressed_line_node(current_addr); 149 else if ((up = push_undo_stack(UADD, 150 current_addr, current_addr)) == NULL) { 151 SPL0(); 152 return ERR; 153 } 154 } while (txt != eot); 155 SPL0(); 156 nsubs++; 157 } 158 } 159 if (nsubs == 0 && !(gflag & GLB)) { 160 sprintf(errmsg, "no match"); 161 return ERR; 162 } else if ((gflag & (GPR | GLS | GNP)) && 163 display_lines(current_addr, current_addr, gflag) < 0) 164 return ERR; 165 return 0; 166} 167 168 169/* substitute_matching_text: replace text matched by a pattern according to 170 a substitution template; return pointer to the modified text */ 171int 172substitute_matching_text(pat, lp, gflag, kth) 173 pattern_t *pat; 174 line_t *lp; 175 int gflag; 176 int kth; 177{ 178 int off = 0; 179 int changed = 0; 180 int matchno = 0; 181 int i = 0; 182 regmatch_t rm[SE_MAX]; 183 char *txt; 184 char *eot; 185 186 if ((txt = get_sbuf_line(lp)) == NULL) 187 return ERR; 188 if (isbinary) 189 NUL_TO_NEWLINE(txt, lp->len); 190 eot = txt + lp->len; 191 if (!regexec(pat, txt, SE_MAX, rm, 0)) { 192 do { 193 if (!kth || kth == ++matchno) { 194 changed++; 195 i = rm[0].rm_so; 196 REALLOC(rbuf, rbufsz, off + i, ERR); 197 if (isbinary) 198 NEWLINE_TO_NUL(txt, rm[0].rm_eo); 199 memcpy(rbuf + off, txt, i); 200 off += i; 201 if ((off = apply_subst_template(txt, rm, off, 202 pat->re_nsub)) < 0) 203 return ERR; 204 } else { 205 i = rm[0].rm_eo; 206 REALLOC(rbuf, rbufsz, off + i, ERR); 207 if (isbinary) 208 NEWLINE_TO_NUL(txt, i); 209 memcpy(rbuf + off, txt, i); 210 off += i; 211 } 212 txt += rm[0].rm_eo; 213 } while (*txt && (!changed || (gflag & GSG) && rm[0].rm_eo) && 214 !regexec(pat, txt, SE_MAX, rm, REG_NOTBOL)); 215 i = eot - txt; 216 REALLOC(rbuf, rbufsz, off + i + 2, ERR); 217 if (i > 0 && !rm[0].rm_eo && (gflag & GSG)) { 218 sprintf(errmsg, "infinite substitution loop"); 219 return ERR; 220 } 221 if (isbinary) 222 NEWLINE_TO_NUL(txt, i); 223 memcpy(rbuf + off, txt, i); 224 memcpy(rbuf + off + i, "\n", 2); 225 } 226 return changed ? off + i + 1 : 0; 227} 228 229 230/* apply_subst_template: modify text according to a substitution template; 231 return offset to end of modified text */ 232int 233apply_subst_template(boln, rm, off, re_nsub) 234 char *boln; 235 regmatch_t *rm; 236 int off; 237 int re_nsub; 238{ 239 int j = 0; 240 int k = 0; 241 int n; 242 char *sub = rhbuf; 243 244 for (; sub - rhbuf < rhbufi; sub++) 245 if (*sub == '&') { 246 j = rm[0].rm_so; 247 k = rm[0].rm_eo; 248 REALLOC(rbuf, rbufsz, off + k - j, ERR); 249 while (j < k) 250 rbuf[off++] = boln[j++]; 251 } else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' && 252 (n = *sub - '0') <= re_nsub) { 253 j = rm[n].rm_so; 254 k = rm[n].rm_eo; 255 REALLOC(rbuf, rbufsz, off + k - j, ERR); 256 while (j < k) 257 rbuf[off++] = boln[j++]; 258 } else { 259 REALLOC(rbuf, rbufsz, off + 1, ERR); 260 rbuf[off++] = *sub; 261 } 262 REALLOC(rbuf, rbufsz, off + 1, ERR); 263 rbuf[off] = '\0'; 264 return off; 265} 266