1 /* $NetBSD: sub.c,v 1.6 2005/02/17 16:29:26 xtraeme 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 1.6 2005/02/17 16:29:26 xtraeme 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(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 * 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) 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 } 113 114 115 char *rbuf; /* substitute_matching_text buffer */ 116 int 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 */ 120 int 121 search_and_replace(pattern_t *pat, int gflag, int kth) 122 { 123 undo_t *up; 124 char *txt; 125 char *eot; 126 long lc; 127 long xa = current_addr; 128 int nsubs = 0; 129 line_t *lp; 130 int len; 131 132 current_addr = first_addr - 1; 133 for (lc = 0; lc <= second_addr - first_addr; lc++) { 134 lp = get_addressed_line_node(++current_addr); 135 if ((len = substitute_matching_text(pat, lp, gflag, kth)) < 0) 136 return ERR; 137 else if (len) { 138 up = NULL; 139 if (delete_lines(current_addr, current_addr) < 0) 140 return ERR; 141 txt = rbuf; 142 eot = rbuf + len; 143 SPL1(); 144 do { 145 if ((txt = put_sbuf_line(txt)) == NULL) { 146 SPL0(); 147 return ERR; 148 } else if (up) 149 up->t = get_addressed_line_node(current_addr); 150 else if ((up = push_undo_stack(UADD, 151 current_addr, current_addr)) == NULL) { 152 SPL0(); 153 return ERR; 154 } 155 } while (txt != eot); 156 SPL0(); 157 nsubs++; 158 xa = current_addr; 159 } 160 } 161 current_addr = xa; 162 if (nsubs == 0 && !(gflag & GLB)) { 163 sprintf(errmsg, "no match"); 164 return ERR; 165 } else if ((gflag & (GPR | GLS | GNP)) && 166 display_lines(current_addr, current_addr, gflag) < 0) 167 return ERR; 168 return 0; 169 } 170 171 172 /* substitute_matching_text: replace text matched by a pattern according to 173 a substitution template; return pointer to the modified text */ 174 int 175 substitute_matching_text(pattern_t *pat, line_t *lp, int gflag, int kth) 176 { 177 int off = 0; 178 int changed = 0; 179 int matchno = 0; 180 int i = 0; 181 regmatch_t rm[SE_MAX]; 182 char *txt; 183 char *eot; 184 185 if ((txt = get_sbuf_line(lp)) == NULL) 186 return ERR; 187 if (isbinary) 188 NUL_TO_NEWLINE(txt, lp->len); 189 eot = txt + lp->len; 190 if (!regexec(pat, txt, SE_MAX, rm, 0)) { 191 do { 192 if (!kth || kth == ++matchno) { 193 changed++; 194 i = rm[0].rm_so; 195 REALLOC(rbuf, rbufsz, off + i, ERR); 196 if (isbinary) 197 NEWLINE_TO_NUL(txt, rm[0].rm_eo); 198 memcpy(rbuf + off, txt, i); 199 off += i; 200 if ((off = apply_subst_template(txt, rm, off, 201 pat->re_nsub)) < 0) 202 return ERR; 203 } else { 204 i = rm[0].rm_eo; 205 REALLOC(rbuf, rbufsz, off + i, ERR); 206 if (isbinary) 207 NEWLINE_TO_NUL(txt, i); 208 memcpy(rbuf + off, txt, i); 209 off += i; 210 } 211 txt += rm[0].rm_eo; 212 } while (*txt && (!changed || ((gflag & GSG) && rm[0].rm_eo)) 213 && !regexec(pat, txt, SE_MAX, rm, REG_NOTBOL)); 214 i = eot - txt; 215 REALLOC(rbuf, rbufsz, off + i + 2, ERR); 216 if (i > 0 && !rm[0].rm_eo && (gflag & GSG)) { 217 sprintf(errmsg, "infinite substitution loop"); 218 return ERR; 219 } 220 if (isbinary) 221 NEWLINE_TO_NUL(txt, i); 222 memcpy(rbuf + off, txt, i); 223 memcpy(rbuf + off + i, "\n", 2); 224 } 225 return changed ? off + i + 1 : 0; 226 } 227 228 229 /* apply_subst_template: modify text according to a substitution template; 230 return offset to end of modified text */ 231 int 232 apply_subst_template(char *boln, regmatch_t *rm, int off, int re_nsub) 233 { 234 int j = 0; 235 int k = 0; 236 int n; 237 char *sub = rhbuf; 238 239 for (; sub - rhbuf < rhbufi; sub++) 240 if (*sub == '&') { 241 j = rm[0].rm_so; 242 k = rm[0].rm_eo; 243 REALLOC(rbuf, rbufsz, off + k - j, ERR); 244 while (j < k) 245 rbuf[off++] = boln[j++]; 246 } else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' && 247 (n = *sub - '0') <= re_nsub) { 248 j = rm[n].rm_so; 249 k = rm[n].rm_eo; 250 REALLOC(rbuf, rbufsz, off + k - j, ERR); 251 while (j < k) 252 rbuf[off++] = boln[j++]; 253 } else { 254 REALLOC(rbuf, rbufsz, off + 1, ERR); 255 rbuf[off++] = *sub; 256 } 257 REALLOC(rbuf, rbufsz, off + 1, ERR); 258 rbuf[off] = '\0'; 259 return off; 260 } 261