1 /*- 2 * Copyright (c) 1992 Diomidis Spinellis. 3 * Copyright (c) 1992, 1993, 1994 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Diomidis Spinellis of Imperial College, University of London. 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 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #ifndef lint 42 static const char sccsid[] = "@(#)process.c 8.6 (Berkeley) 4/20/94"; 43 #endif 44 45 #include <sys/types.h> 46 #include <sys/stat.h> 47 #include <sys/ioctl.h> 48 #include <sys/uio.h> 49 50 #include <ctype.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <limits.h> 55 #include <regex.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #include "defs.h" 62 #include "extern.h" 63 64 static SPACE HS, PS, SS; 65 #define pd PS.deleted 66 #define ps PS.space 67 #define psl PS.len 68 #define hs HS.space 69 #define hsl HS.len 70 71 static __inline int applies(struct s_command *); 72 static void flush_appends(void); 73 static void lputs(char *); 74 static __inline int regexec_e(regex_t *, const char *, int, int, size_t); 75 static void regsub(SPACE *, char *, char *); 76 static int substitute(struct s_command *); 77 78 struct s_appends *appends; /* Array of pointers to strings to append. */ 79 static int appendx; /* Index into appends array. */ 80 int appendnum; /* Size of appends array. */ 81 82 static int lastaddr; /* Set by applies if last address of a range. */ 83 static int sdone; /* If any substitutes since last line input. */ 84 /* Iov structure for 'w' commands. */ 85 static regex_t *defpreg; 86 size_t maxnsub; 87 regmatch_t *match; 88 89 #define OUT(s) { fwrite(s, sizeof(u_char), psl, outfile); fputc('\n', outfile); } 90 91 void 92 process(void) 93 { 94 struct s_command *cp; 95 SPACE tspace; 96 size_t len, oldpsl = 0; 97 char *p; 98 99 p = NULL; 100 101 for (linenum = 0; mf_fgets(&PS, REPLACE);) { 102 pd = 0; 103 top: 104 cp = prog; 105 redirect: 106 while (cp != NULL) { 107 if (!applies(cp)) { 108 cp = cp->next; 109 continue; 110 } 111 switch (cp->code) { 112 case '{': 113 cp = cp->u.c; 114 goto redirect; 115 case 'a': 116 if (appendx >= appendnum) 117 if ((appends = realloc(appends, 118 sizeof(struct s_appends) * 119 (appendnum *= 2))) == NULL) 120 err(1, "realloc"); 121 appends[appendx].type = AP_STRING; 122 appends[appendx].s = cp->t; 123 appends[appendx].len = strlen(cp->t); 124 appendx++; 125 break; 126 case 'b': 127 cp = cp->u.c; 128 goto redirect; 129 case 'c': 130 pd = 1; 131 psl = 0; 132 if (cp->a2 == NULL || lastaddr) 133 (void)fprintf(outfile, "%s", cp->t); 134 break; 135 case 'd': 136 pd = 1; 137 goto new; 138 case 'D': 139 if (pd) 140 goto new; 141 if (psl == 0 || 142 (p = memchr(ps, '\n', psl)) == NULL) { 143 pd = 1; 144 goto new; 145 } else { 146 psl -= (p + 1) - ps; 147 memmove(ps, p + 1, psl); 148 goto top; 149 } 150 case 'g': 151 cspace(&PS, hs, hsl, REPLACE); 152 break; 153 case 'G': 154 cspace(&PS, "\n", 1, 0); 155 cspace(&PS, hs, hsl, 0); 156 break; 157 case 'h': 158 cspace(&HS, ps, psl, REPLACE); 159 break; 160 case 'H': 161 cspace(&HS, "\n", 1, 0); 162 cspace(&HS, ps, psl, 0); 163 break; 164 case 'i': 165 (void)fprintf(outfile, "%s", cp->t); 166 break; 167 case 'l': 168 lputs(ps); 169 break; 170 case 'n': 171 if (!nflag && !pd) 172 OUT(ps) 173 flush_appends(); 174 if (!mf_fgets(&PS, REPLACE)) 175 exit(0); 176 pd = 0; 177 break; 178 case 'N': 179 flush_appends(); 180 cspace(&PS, "\n", 1, 0); 181 if (!mf_fgets(&PS, 0)) 182 exit(0); 183 break; 184 case 'p': 185 if (pd) 186 break; 187 OUT(ps) 188 break; 189 case 'P': 190 if (pd) 191 break; 192 if (psl != 0 && 193 (p = memchr(ps, '\n', psl)) != NULL) { 194 oldpsl = psl; 195 psl = p - ps; 196 } 197 OUT(ps) 198 if (p != NULL) 199 psl = oldpsl; 200 break; 201 case 'q': 202 if (!nflag && !pd) 203 OUT(ps) 204 flush_appends(); 205 exit(0); 206 case 'r': 207 if (appendx >= appendnum) 208 if ((appends = realloc(appends, 209 sizeof(struct s_appends) * 210 (appendnum *= 2))) == NULL) 211 err(1, "realloc"); 212 appends[appendx].type = AP_FILE; 213 appends[appendx].s = cp->t; 214 appends[appendx].len = strlen(cp->t); 215 appendx++; 216 break; 217 case 's': 218 sdone |= substitute(cp); 219 break; 220 case 't': 221 if (sdone) { 222 sdone = 0; 223 cp = cp->u.c; 224 goto redirect; 225 } 226 break; 227 case 'w': 228 if (pd) 229 break; 230 if (cp->u.fd == -1 && (cp->u.fd = open(cp->t, 231 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, 232 DEFFILEMODE)) == -1) 233 err(1, "%s", cp->t); 234 if (write(cp->u.fd, ps, psl) != psl || 235 write(cp->u.fd, "\n", 1) != 1) 236 err(1, "%s", cp->t); 237 break; 238 case 'x': 239 if (hs == NULL) 240 cspace(&HS, "", 0, REPLACE); 241 tspace = PS; 242 PS = HS; 243 HS = tspace; 244 break; 245 case 'y': 246 if (pd || psl == 0) 247 break; 248 for (p = ps, len = psl; len--; ++p) 249 *p = cp->u.y[(unsigned char)*p]; 250 break; 251 case ':': 252 case '}': 253 break; 254 case '=': 255 (void)fprintf(outfile, "%lu\n", linenum); 256 } 257 cp = cp->next; 258 } /* for all cp */ 259 260 new: if (!nflag && !pd) 261 OUT(ps) 262 flush_appends(); 263 } /* for all lines */ 264 } 265 266 /* 267 * TRUE if the address passed matches the current program state 268 * (lastline, linenumber, ps). 269 */ 270 #define MATCH(a) \ 271 (a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, psl) : \ 272 (a)->type == AT_LINE ? linenum == (a)->u.l : lastline() 273 274 /* 275 * Return TRUE if the command applies to the current line. Sets the inrange 276 * flag to process ranges. Interprets the non-select (``!'') flag. 277 */ 278 static __inline int 279 applies(struct s_command *cp) 280 { 281 int r; 282 283 lastaddr = 0; 284 if (cp->a1 == NULL && cp->a2 == NULL) 285 r = 1; 286 else if (cp->a2) 287 if (cp->inrange) { 288 if (MATCH(cp->a2)) { 289 cp->inrange = 0; 290 lastaddr = 1; 291 } 292 r = 1; 293 } else if (MATCH(cp->a1)) { 294 /* 295 * If the second address is a number less than or 296 * equal to the line number first selected, only 297 * one line shall be selected. 298 * -- POSIX 1003.2 299 */ 300 if (cp->a2->type == AT_LINE && 301 linenum >= cp->a2->u.l) 302 lastaddr = 1; 303 else 304 cp->inrange = 1; 305 r = 1; 306 } else 307 r = 0; 308 else 309 r = MATCH(cp->a1); 310 return (cp->nonsel ? ! r : r); 311 } 312 313 /* 314 * substitute -- 315 * Do substitutions in the pattern space. Currently, we build a 316 * copy of the new pattern space in the substitute space structure 317 * and then swap them. 318 */ 319 static int 320 substitute(struct s_command *cp) 321 { 322 SPACE tspace; 323 regex_t *re; 324 regoff_t re_off, slen; 325 int lastempty, n; 326 char *s; 327 328 s = ps; 329 re = cp->u.s->re; 330 if (re == NULL) { 331 if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) { 332 linenum = cp->u.s->linenum; 333 errx(1, "%lu: %s: \\%d not defined in the RE", 334 linenum, fname, cp->u.s->maxbref); 335 } 336 } 337 if (!regexec_e(re, s, 0, 0, psl)) 338 return (0); 339 340 SS.len = 0; /* Clean substitute space. */ 341 slen = psl; 342 n = cp->u.s->n; 343 lastempty = 1; 344 345 switch (n) { 346 case 0: /* Global */ 347 do { 348 if (lastempty || match[0].rm_so != match[0].rm_eo) { 349 /* Locate start of replaced string. */ 350 re_off = match[0].rm_so; 351 /* Copy leading retained string. */ 352 cspace(&SS, s, re_off, APPEND); 353 /* Add in regular expression. */ 354 regsub(&SS, s, cp->u.s->new); 355 } 356 357 /* Move past this match. */ 358 if (match[0].rm_so != match[0].rm_eo) { 359 s += match[0].rm_eo; 360 slen -= match[0].rm_eo; 361 lastempty = 0; 362 } else { 363 if (match[0].rm_so < slen) 364 cspace(&SS, s + match[0].rm_so, 1, 365 APPEND); 366 s += match[0].rm_so + 1; 367 slen -= match[0].rm_so + 1; 368 lastempty = 1; 369 } 370 } while (slen >= 0 && regexec_e(re, s, REG_NOTBOL, 0, slen)); 371 /* Copy trailing retained string. */ 372 if (slen > 0) 373 cspace(&SS, s, slen, APPEND); 374 break; 375 default: /* Nth occurrence */ 376 while (--n) { 377 if (match[0].rm_eo == match[0].rm_so) 378 match[0].rm_eo = match[0].rm_so + 1; 379 s += match[0].rm_eo; 380 slen -= match[0].rm_eo; 381 if (slen < 0) 382 return (0); 383 if (!regexec_e(re, s, REG_NOTBOL, 0, slen)) 384 return (0); 385 } 386 /* FALLTHROUGH */ 387 case 1: /* 1st occurrence */ 388 /* Locate start of replaced string. */ 389 re_off = match[0].rm_so + (s - ps); 390 /* Copy leading retained string. */ 391 cspace(&SS, ps, re_off, APPEND); 392 /* Add in regular expression. */ 393 regsub(&SS, s, cp->u.s->new); 394 /* Copy trailing retained string. */ 395 s += match[0].rm_eo; 396 slen -= match[0].rm_eo; 397 cspace(&SS, s, slen, APPEND); 398 break; 399 } 400 401 /* 402 * Swap the substitute space and the pattern space, and make sure 403 * that any leftover pointers into stdio memory get lost. 404 */ 405 tspace = PS; 406 PS = SS; 407 SS = tspace; 408 SS.space = SS.back; 409 410 /* Handle the 'p' flag. */ 411 if (cp->u.s->p) 412 OUT(ps) 413 414 /* Handle the 'w' flag. */ 415 if (cp->u.s->wfile && !pd) { 416 if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile, 417 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1) 418 err(1, "%s", cp->u.s->wfile); 419 if (write(cp->u.s->wfd, ps, psl) != psl || 420 write(cp->u.s->wfd, "\n", 1) != 1) 421 err(1, "%s", cp->u.s->wfile); 422 } 423 return (1); 424 } 425 426 /* 427 * Flush append requests. Always called before reading a line, 428 * therefore it also resets the substitution done (sdone) flag. 429 */ 430 static void 431 flush_appends(void) 432 { 433 FILE *f; 434 int count, i; 435 char buf[8 * 1024]; 436 437 for (i = 0; i < appendx; i++) 438 switch (appends[i].type) { 439 case AP_STRING: 440 fwrite(appends[i].s, sizeof(char), appends[i].len, 441 outfile); 442 break; 443 case AP_FILE: 444 /* 445 * Read files probably shouldn't be cached. Since 446 * it's not an error to read a non-existent file, 447 * it's possible that another program is interacting 448 * with the sed script through the filesystem. It 449 * would be truly bizarre, but possible. It's probably 450 * not that big a performance win, anyhow. 451 */ 452 if ((f = fopen(appends[i].s, "r")) == NULL) 453 break; 454 while ((count = fread(buf, sizeof(char), sizeof(buf), f))) 455 (void)fwrite(buf, sizeof(char), count, outfile); 456 (void)fclose(f); 457 break; 458 } 459 if (ferror(outfile)) 460 errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO)); 461 appendx = sdone = 0; 462 } 463 464 static void 465 lputs(char *s) 466 { 467 int count; 468 const char *escapes; 469 char *p; 470 struct winsize win; 471 static int termwidth = -1; 472 473 if (outfile != stdout) 474 termwidth = 60; 475 if (termwidth == -1) { 476 if ((p = getenv("COLUMNS")) && *p != '\0') 477 termwidth = atoi(p); 478 else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 && 479 win.ws_col > 0) 480 termwidth = win.ws_col; 481 else 482 termwidth = 60; 483 } 484 485 for (count = 0; *s; ++s) { 486 if (count + 5 >= termwidth) { 487 (void)fprintf(outfile, "\\\n"); 488 count = 0; 489 } 490 if (isprint((unsigned char)*s) && *s != '\\') { 491 (void)fputc(*s, outfile); 492 count++; 493 } else if (*s == '\n') { 494 (void)fputc('$', outfile); 495 (void)fputc('\n', outfile); 496 count = 0; 497 } else { 498 escapes = "\\\a\b\f\r\t\v"; 499 (void)fputc('\\', outfile); 500 if ((p = strchr(escapes, *s))) { 501 (void)fputc("\\abfrtv"[p - escapes], outfile); 502 count += 2; 503 } else { 504 (void)fprintf(outfile, "%03o", *(u_char *)s); 505 count += 4; 506 } 507 } 508 } 509 (void)fputc('$', outfile); 510 (void)fputc('\n', outfile); 511 if (ferror(outfile)) 512 errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO)); 513 } 514 515 static __inline int 516 regexec_e(regex_t *preg, const char *string, int eflags, int nomatch, 517 size_t slen) 518 { 519 int eval; 520 521 if (preg == NULL) { 522 if (defpreg == NULL) 523 errx(1, "first RE may not be empty"); 524 } else 525 defpreg = preg; 526 527 /* Set anchors */ 528 match[0].rm_so = 0; 529 match[0].rm_eo = slen; 530 531 eval = regexec(defpreg, string, 532 nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND); 533 switch(eval) { 534 case 0: 535 return (1); 536 case REG_NOMATCH: 537 return (0); 538 } 539 errx(1, "RE error: %s", strregerror(eval, defpreg)); 540 /* NOTREACHED */ 541 } 542 543 /* 544 * regsub - perform substitutions after a regexp match 545 * Based on a routine by Henry Spencer 546 */ 547 static void 548 regsub(SPACE *sp, char *string, char *src) 549 { 550 int len, no; 551 char c, *dst; 552 553 #define NEEDSP(reqlen) \ 554 /* XXX What is the +1 for? */ \ 555 if (sp->len + (reqlen) + 1 >= sp->blen) { \ 556 sp->blen += (reqlen) + 1024; \ 557 if ((sp->space = sp->back = realloc(sp->back, sp->blen)) \ 558 == NULL) \ 559 err(1, "realloc"); \ 560 dst = sp->space + sp->len; \ 561 } 562 563 dst = sp->space + sp->len; 564 while ((c = *src++) != '\0') { 565 if (c == '&') 566 no = 0; 567 else if (c == '\\' && isdigit((unsigned char)*src)) 568 no = *src++ - '0'; 569 else 570 no = -1; 571 if (no < 0) { /* Ordinary character. */ 572 if (c == '\\' && (*src == '\\' || *src == '&')) 573 c = *src++; 574 NEEDSP(1); 575 *dst++ = c; 576 ++sp->len; 577 } else if (match[no].rm_so != -1 && match[no].rm_eo != -1) { 578 len = match[no].rm_eo - match[no].rm_so; 579 NEEDSP(len); 580 memmove(dst, string + match[no].rm_so, len); 581 dst += len; 582 sp->len += len; 583 } 584 } 585 NEEDSP(1); 586 *dst = '\0'; 587 } 588 589 /* 590 * aspace -- 591 * Append the source space to the destination space, allocating new 592 * space as necessary. 593 */ 594 void 595 cspace(SPACE *sp, const char *p, size_t len, enum e_spflag spflag) 596 { 597 size_t tlen; 598 599 /* Make sure SPACE has enough memory and ramp up quickly. */ 600 tlen = sp->len + len + 1; 601 if (tlen > sp->blen) { 602 sp->blen = tlen + 1024; 603 if ((sp->space = sp->back = realloc(sp->back, sp->blen)) == 604 NULL) 605 err(1, "realloc"); 606 } 607 608 if (spflag == REPLACE) 609 sp->len = 0; 610 611 memmove(sp->space + sp->len, p, len); 612 613 sp->space[sp->len += len] = '\0'; 614 } 615 616 /* 617 * Close all cached opened files and report any errors 618 */ 619 void 620 cfclose(struct s_command *cp, struct s_command *end) 621 { 622 623 for (; cp != end; cp = cp->next) 624 switch(cp->code) { 625 case 's': 626 if (cp->u.s->wfd != -1 && close(cp->u.s->wfd)) 627 err(1, "%s", cp->u.s->wfile); 628 cp->u.s->wfd = -1; 629 break; 630 case 'w': 631 if (cp->u.fd != -1 && close(cp->u.fd)) 632 err(1, "%s", cp->t); 633 cp->u.fd = -1; 634 break; 635 case '{': 636 cfclose(cp->u.c, cp->next); 637 break; 638 } 639 } 640