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 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: src/usr.bin/sed/process.c,v 1.39 2005/04/09 14:31:41 stefanf Exp $"); 36 37#ifndef lint 38static const char sccsid[] = "@(#)process.c 8.6 (Berkeley) 4/20/94"; 39#endif 40 41#include <sys/types.h> 42#include <sys/stat.h> 43#include <sys/ioctl.h> 44#include <sys/uio.h> 45 46#include <ctype.h> 47#include <err.h> 48#include <errno.h> 49#include <fcntl.h> 50#include <limits.h> 51#include <regex.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <string.h> 55#include <unistd.h> 56#include <wchar.h> 57#include <wctype.h> 58 59#include "defs.h" 60#include "extern.h" 61 62static SPACE HS, PS, SS, YS; 63#define pd PS.deleted 64#define ps PS.space 65#define psl PS.len 66#define hs HS.space 67#define hsl HS.len 68 69static __inline int applies(struct s_command *); 70static void do_tr(struct s_tr *); 71static void flush_appends(void); 72static void lputs(char *, size_t); 73static __inline int regexec_e(regex_t *, const char *, int, int, size_t); 74static void regsub(SPACE *, char *, char *); 75static int substitute(struct s_command *); 76 77struct s_appends *appends; /* Array of pointers to strings to append. */ 78static int appendx; /* Index into appends array. */ 79int appendnum; /* Size of appends array. */ 80 81static int lastaddr; /* Set by applies if last address of a range. */ 82static int sdone; /* If any substitutes since last line input. */ 83 /* Iov structure for 'w' commands. */ 84static regex_t *defpreg; 85size_t maxnsub; 86regmatch_t *match; 87 88#define OUT(s) { fwrite(s, sizeof(u_char), psl, outfile); fputc('\n', outfile); } 89 90void 91process(void) 92{ 93 struct s_command *cp; 94 SPACE tspace; 95 size_t oldpsl = 0; 96 char *p; 97 98 p = NULL; 99 100 for (linenum = 0; mf_fgets(&PS, REPLACE);) { 101 pd = 0; 102top: 103 cp = prog; 104redirect: 105 while (cp != NULL) { 106 if (!applies(cp)) { 107 cp = cp->next; 108 continue; 109 } 110 switch (cp->code) { 111 case '{': 112 cp = cp->u.c; 113 goto redirect; 114 case 'a': 115 if (appendx >= appendnum) 116 if ((appends = realloc(appends, 117 sizeof(struct s_appends) * 118 (appendnum *= 2))) == NULL) 119 err(1, "realloc"); 120 appends[appendx].type = AP_STRING; 121 appends[appendx].s = cp->t; 122 appends[appendx].len = strlen(cp->t); 123 appendx++; 124 break; 125 case 'b': 126 cp = cp->u.c; 127 goto redirect; 128 case 'c': 129 pd = 1; 130 psl = 0; 131 if (cp->a2 == NULL || lastaddr) 132 (void)fprintf(outfile, "%s", cp->t); 133 break; 134 case 'd': 135 pd = 1; 136 goto new; 137 case 'D': 138 if (pd) 139 goto new; 140 if (psl == 0 || 141 (p = memchr(ps, '\n', psl)) == NULL) { 142 pd = 1; 143 goto new; 144 } else { 145 psl -= (p + 1) - ps; 146 memmove(ps, p + 1, psl); 147 goto top; 148 } 149 case 'g': 150 cspace(&PS, hs, hsl, REPLACE); 151 break; 152 case 'G': 153 cspace(&PS, "\n", 1, 0); 154 cspace(&PS, hs, hsl, 0); 155 break; 156 case 'h': 157 cspace(&HS, ps, psl, REPLACE); 158 break; 159 case 'H': 160 cspace(&HS, "\n", 1, 0); 161 cspace(&HS, ps, psl, 0); 162 break; 163 case 'i': 164 (void)fprintf(outfile, "%s", cp->t); 165 break; 166 case 'l': 167 lputs(ps, psl); 168 break; 169 case 'n': 170 if (!nflag && !pd) 171 OUT(ps) 172 flush_appends(); 173 if (!mf_fgets(&PS, REPLACE)) 174 exit(0); 175 pd = 0; 176 break; 177 case 'N': 178 flush_appends(); 179 cspace(&PS, "\n", 1, 0); 180 if (!mf_fgets(&PS, 0)) 181 exit(0); 182 break; 183 case 'p': 184 if (pd) 185 break; 186 OUT(ps) 187 break; 188 case 'P': 189 if (pd) 190 break; 191 if (psl != 0 && 192 (p = memchr(ps, '\n', psl)) != NULL) { 193 oldpsl = psl; 194 psl = p - ps; 195 } 196 OUT(ps) 197 if (p != NULL) 198 psl = oldpsl; 199 break; 200 case 'q': 201 if (!nflag && !pd) 202 OUT(ps) 203 flush_appends(); 204 lseek(STDIN_FILENO, ftell(stdin), SEEK_SET); 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 do_tr(cp->u.y); 249 break; 250 case ':': 251 case '}': 252 break; 253 case '=': 254 (void)fprintf(outfile, "%lu\n", linenum); 255 } 256 cp = cp->next; 257 } /* for all cp */ 258 259new: if (!nflag && !pd) 260 OUT(ps) 261 flush_appends(); 262 } /* for all lines */ 263} 264 265/* 266 * TRUE if the address passed matches the current program state 267 * (lastline, linenumber, ps). 268 */ 269#define MATCH(a) \ 270 (a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, psl) : \ 271 (a)->type == AT_LINE ? linenum == (a)->u.l : lastline() 272 273/* 274 * Return TRUE if the command applies to the current line. Sets the inrange 275 * flag to process ranges. Interprets the non-select (``!'') flag. 276 */ 277static __inline int 278applies(struct s_command *cp) 279{ 280 int r; 281 282 lastaddr = 0; 283 if (cp->a1 == NULL && cp->a2 == NULL) 284 r = 1; 285 else if (cp->a2) 286 if (cp->inrange) { 287 if (MATCH(cp->a2)) { 288 cp->inrange = 0; 289 lastaddr = 1; 290 } 291 r = 1; 292 } else if (MATCH(cp->a1)) { 293 /* 294 * If the second address is a number less than or 295 * equal to the line number first selected, only 296 * one line shall be selected. 297 * -- POSIX 1003.2 298 */ 299 if (cp->a2->type == AT_LINE && 300 linenum >= cp->a2->u.l) 301 lastaddr = 1; 302 else 303 cp->inrange = 1; 304 r = 1; 305 } else 306 r = 0; 307 else 308 r = MATCH(cp->a1); 309 return (cp->nonsel ? ! r : r); 310} 311 312/* 313 * substitute -- 314 * Do substitutions in the pattern space. Currently, we build a 315 * copy of the new pattern space in the substitute space structure 316 * and then swap them. 317 */ 318static int 319substitute(struct s_command *cp) 320{ 321 SPACE tspace; 322 regex_t *re; 323 regoff_t re_off, slen; 324 int lastempty, n; 325 char *s; 326 327 s = ps; 328 re = cp->u.s->re; 329 if (re == NULL) { 330 if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) { 331 linenum = cp->u.s->linenum; 332 errx(1, "%lu: %s: \\%d not defined in the RE", 333 linenum, fname, cp->u.s->maxbref); 334 } 335 } 336 if (!regexec_e(re, s, 0, 0, psl)) 337 return (0); 338 339 SS.len = 0; /* Clean substitute space. */ 340 slen = psl; 341 n = cp->u.s->n; 342 lastempty = 1; 343 344 switch (n) { 345 case 0: /* Global */ 346 do { 347 if (lastempty || match[0].rm_so != match[0].rm_eo) { 348 /* Locate start of replaced string. */ 349 re_off = match[0].rm_so; 350 /* Copy leading retained string. */ 351 cspace(&SS, s, re_off, APPEND); 352 /* Add in regular expression. */ 353 regsub(&SS, s, cp->u.s->new); 354 } 355 356 /* Move past this match. */ 357 if (match[0].rm_so != match[0].rm_eo) { 358 s += match[0].rm_eo; 359 slen -= match[0].rm_eo; 360 lastempty = 0; 361 } else { 362 if (match[0].rm_so < slen) 363 cspace(&SS, s + match[0].rm_so, 1, 364 APPEND); 365 s += match[0].rm_so + 1; 366 slen -= match[0].rm_so + 1; 367 lastempty = 1; 368 } 369 } while (slen >= 0 && regexec_e(re, s, REG_NOTBOL, 0, slen)); 370 /* Copy trailing retained string. */ 371 if (slen > 0) 372 cspace(&SS, s, slen, APPEND); 373 break; 374 default: /* Nth occurrence */ 375 while (--n) { 376 if (match[0].rm_eo == match[0].rm_so) 377 match[0].rm_eo = match[0].rm_so + 1; 378 s += match[0].rm_eo; 379 slen -= match[0].rm_eo; 380 if (slen < 0) 381 return (0); 382 if (!regexec_e(re, s, REG_NOTBOL, 0, slen)) 383 return (0); 384 } 385 /* FALLTHROUGH */ 386 case 1: /* 1st occurrence */ 387 /* Locate start of replaced string. */ 388 re_off = match[0].rm_so + (s - ps); 389 /* Copy leading retained string. */ 390 cspace(&SS, ps, re_off, APPEND); 391 /* Add in regular expression. */ 392 regsub(&SS, s, cp->u.s->new); 393 /* Copy trailing retained string. */ 394 s += match[0].rm_eo; 395 slen -= match[0].rm_eo; 396 cspace(&SS, s, slen, APPEND); 397 break; 398 } 399 400 /* 401 * Swap the substitute space and the pattern space, and make sure 402 * that any leftover pointers into stdio memory get lost. 403 */ 404 tspace = PS; 405 PS = SS; 406 SS = tspace; 407 SS.space = SS.back; 408 409 /* Handle the 'p' flag. */ 410 if (cp->u.s->p) 411 OUT(ps) 412 413 /* Handle the 'w' flag. */ 414 if (cp->u.s->wfile && !pd) { 415 if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile, 416 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1) 417 err(1, "%s", cp->u.s->wfile); 418 if (write(cp->u.s->wfd, ps, psl) != psl || 419 write(cp->u.s->wfd, "\n", 1) != 1) 420 err(1, "%s", cp->u.s->wfile); 421 } 422 return (1); 423} 424 425/* 426 * do_tr -- 427 * Perform translation ('y' command) in the pattern space. 428 */ 429static void 430do_tr(struct s_tr *y) 431{ 432 SPACE tmp; 433 char c, *p; 434 size_t clen, left; 435 int i; 436 437 if (MB_CUR_MAX == 1) { 438 /* 439 * Single-byte encoding: perform in-place translation 440 * of the pattern space. 441 */ 442 for (p = ps; p < &ps[psl]; p++) 443 *p = y->bytetab[(u_char)*p]; 444 } else { 445 /* 446 * Multi-byte encoding: perform translation into the 447 * translation space, then swap the translation and 448 * pattern spaces. 449 */ 450 /* Clean translation space. */ 451 YS.len = 0; 452 for (p = ps, left = psl; left > 0; p += clen, left -= clen) { 453 if ((c = y->bytetab[(u_char)*p]) != '\0') { 454 cspace(&YS, &c, 1, APPEND); 455 clen = 1; 456 continue; 457 } 458 for (i = 0; i < y->nmultis; i++) 459 if (left >= y->multis[i].fromlen && 460 memcmp(p, y->multis[i].from, 461 y->multis[i].fromlen) == 0) 462 break; 463 if (i < y->nmultis) { 464 cspace(&YS, y->multis[i].to, 465 y->multis[i].tolen, APPEND); 466 clen = y->multis[i].fromlen; 467 } else { 468 cspace(&YS, p, 1, APPEND); 469 clen = 1; 470 } 471 } 472 /* Swap the translation space and the pattern space. */ 473 tmp = PS; 474 PS = YS; 475 YS = tmp; 476 YS.space = YS.back; 477 } 478} 479 480/* 481 * Flush append requests. Always called before reading a line, 482 * therefore it also resets the substitution done (sdone) flag. 483 */ 484static void 485flush_appends(void) 486{ 487 FILE *f; 488 int count, i; 489 char buf[8 * 1024]; 490 491 for (i = 0; i < appendx; i++) 492 switch (appends[i].type) { 493 case AP_STRING: 494 fwrite(appends[i].s, sizeof(char), appends[i].len, 495 outfile); 496 break; 497 case AP_FILE: 498 /* 499 * Read files probably shouldn't be cached. Since 500 * it's not an error to read a non-existent file, 501 * it's possible that another program is interacting 502 * with the sed script through the filesystem. It 503 * would be truly bizarre, but possible. It's probably 504 * not that big a performance win, anyhow. 505 */ 506 if ((f = fopen(appends[i].s, "r")) == NULL) 507 break; 508 while ((count = fread(buf, sizeof(char), sizeof(buf), f))) 509 (void)fwrite(buf, sizeof(char), count, outfile); 510 (void)fclose(f); 511 break; 512 } 513 if (ferror(outfile)) 514 errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO)); 515 appendx = sdone = 0; 516} 517 518static void 519lputs(char *s, size_t len) 520{ 521 static const char escapes[] = "\\\a\b\f\r\t\v"; 522 int c, col, width; 523 char *p; 524 struct winsize win; 525 static int termwidth = -1; 526 size_t clen, i; 527 wchar_t wc; 528 mbstate_t mbs; 529 530 if (outfile != stdout) 531 termwidth = 60; 532 if (termwidth == -1) { 533 if ((p = getenv("COLUMNS")) && *p != '\0') 534 termwidth = atoi(p); 535 else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 && 536 win.ws_col > 0) 537 termwidth = win.ws_col; 538 else 539 termwidth = 60; 540 } 541 542 memset(&mbs, 0, sizeof(mbs)); 543 col = 0; 544 while (len != 0) { 545 clen = mbrtowc(&wc, s, len, &mbs); 546 if (clen == 0) 547 clen = 1; 548 if (clen == (size_t)-1 || clen == (size_t)-2) { 549 wc = (unsigned char)*s; 550 clen = 1; 551 memset(&mbs, 0, sizeof(mbs)); 552 } 553 if (wc == '\n') { 554 if (col + 1 >= termwidth) 555 fprintf(outfile, "\\\n"); 556 fputc('$', outfile); 557 fputc('\n', outfile); 558 col = 0; 559 } else if (iswprint(wc)) { 560 width = wcwidth(wc); 561 if (col + width >= termwidth) { 562 fprintf(outfile, "\\\n"); 563 col = 0; 564 } 565 fwrite(s, 1, clen, outfile); 566 col += width; 567 } else if (wc != L'\0' && (c = wctob(wc)) != EOF && 568 (p = strchr(escapes, c)) != NULL) { 569 if (col + 2 >= termwidth) { 570 fprintf(outfile, "\\\n"); 571 col = 0; 572 } 573 fprintf(outfile, "\\%c", "\\abfrtv"[p - escapes]); 574 col += 2; 575 } else { 576 if (col + 4 * clen >= termwidth) { 577 fprintf(outfile, "\\\n"); 578 col = 0; 579 } 580 for (i = 0; i < clen; i++) 581 fprintf(outfile, "\\%03o", 582 (int)(unsigned char)s[i]); 583 col += 4 * clen; 584 } 585 s += clen; 586 len -= clen; 587 } 588 if (col + 1 >= termwidth) 589 fprintf(outfile, "\\\n"); 590 (void)fputc('$', outfile); 591 (void)fputc('\n', outfile); 592 if (ferror(outfile)) 593 errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO)); 594} 595 596static __inline int 597regexec_e(regex_t *preg, const char *string, int eflags, int nomatch, 598 size_t slen) 599{ 600 int eval; 601 602 if (preg == NULL) { 603 if (defpreg == NULL) 604 errx(1, "first RE may not be empty"); 605 } else 606 defpreg = preg; 607 608 /* Set anchors */ 609 match[0].rm_so = 0; 610 match[0].rm_eo = slen; 611 612 eval = regexec(defpreg, string, 613 nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND); 614 switch(eval) { 615 case 0: 616 return (1); 617 case REG_NOMATCH: 618 return (0); 619 } 620 errx(1, "RE error: %s", strregerror(eval, defpreg)); 621 /* NOTREACHED */ 622} 623 624/* 625 * regsub - perform substitutions after a regexp match 626 * Based on a routine by Henry Spencer 627 */ 628static void 629regsub(SPACE *sp, char *string, char *src) 630{ 631 int len, no; 632 char c, *dst; 633 634#define NEEDSP(reqlen) \ 635 /* XXX What is the +1 for? */ \ 636 if (sp->len + (reqlen) + 1 >= sp->blen) { \ 637 sp->blen += (reqlen) + 1024; \ 638 if ((sp->space = sp->back = realloc(sp->back, sp->blen)) \ 639 == NULL) \ 640 err(1, "realloc"); \ 641 dst = sp->space + sp->len; \ 642 } 643 644 dst = sp->space + sp->len; 645 while ((c = *src++) != '\0') { 646 if (c == '&') 647 no = 0; 648 else if (c == '\\' && isdigit((unsigned char)*src)) 649 no = *src++ - '0'; 650 else 651 no = -1; 652 if (no < 0) { /* Ordinary character. */ 653 if (c == '\\' && (*src == '\\' || *src == '&')) 654 c = *src++; 655 NEEDSP(1); 656 *dst++ = c; 657 ++sp->len; 658 } else if (match[no].rm_so != -1 && match[no].rm_eo != -1) { 659 len = match[no].rm_eo - match[no].rm_so; 660 NEEDSP(len); 661 memmove(dst, string + match[no].rm_so, len); 662 dst += len; 663 sp->len += len; 664 } 665 } 666 NEEDSP(1); 667 *dst = '\0'; 668} 669 670/* 671 * aspace -- 672 * Append the source space to the destination space, allocating new 673 * space as necessary. 674 */ 675void 676cspace(SPACE *sp, const char *p, size_t len, enum e_spflag spflag) 677{ 678 size_t tlen; 679 680 /* Make sure SPACE has enough memory and ramp up quickly. */ 681 tlen = sp->len + len + 1; 682 if (tlen > sp->blen) { 683 sp->blen = tlen + 1024; 684 if ((sp->space = sp->back = realloc(sp->back, sp->blen)) == 685 NULL) 686 err(1, "realloc"); 687 } 688 689 if (spflag == REPLACE) 690 sp->len = 0; 691 692 memmove(sp->space + sp->len, p, len); 693 694 sp->space[sp->len += len] = '\0'; 695} 696 697/* 698 * Close all cached opened files and report any errors 699 */ 700void 701cfclose(struct s_command *cp, struct s_command *end) 702{ 703 704 for (; cp != end; cp = cp->next) 705 switch(cp->code) { 706 case 's': 707 if (cp->u.s->wfd != -1 && close(cp->u.s->wfd)) 708 err(1, "%s", cp->u.s->wfile); 709 cp->u.s->wfd = -1; 710 break; 711 case 'w': 712 if (cp->u.fd != -1 && close(cp->u.fd)) 713 err(1, "%s", cp->t); 714 cp->u.fd = -1; 715 break; 716 case '{': 717 cfclose(cp->u.c, cp->next); 718 break; 719 } 720} 721