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("$FreeBSD$"); 36 37 #ifndef lint 38 static 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 62 static SPACE HS, PS, SS, YS; 63 #define pd PS.deleted 64 #define ps PS.space 65 #define psl PS.len 66 #define psanl PS.append_newline 67 #define hs HS.space 68 #define hsl HS.len 69 70 static inline int applies(struct s_command *); 71 static void do_tr(struct s_tr *); 72 static void flush_appends(void); 73 static void lputs(char *, size_t); 74 static int regexec_e(regex_t *, const char *, int, int, size_t, 75 size_t); 76 static void regsub(SPACE *, char *, char *); 77 static int substitute(struct s_command *); 78 79 struct s_appends *appends; /* Array of pointers to strings to append. */ 80 static int appendx; /* Index into appends array. */ 81 int appendnum; /* Size of appends array. */ 82 83 static int lastaddr; /* Set by applies if last address of a range. */ 84 static int sdone; /* If any substitutes since last line input. */ 85 /* Iov structure for 'w' commands. */ 86 static regex_t *defpreg; 87 size_t maxnsub; 88 regmatch_t *match; 89 90 #define OUT() do { \ 91 fwrite(ps, 1, psl, outfile); \ 92 if (psanl) fputc('\n', outfile); \ 93 } while (0) 94 95 void 96 process(void) 97 { 98 struct s_command *cp; 99 SPACE tspace; 100 size_t oldpsl = 0; 101 char *p; 102 int oldpsanl; 103 104 p = NULL; 105 106 for (linenum = 0; mf_fgets(&PS, REPLACE);) { 107 pd = 0; 108 top: 109 cp = prog; 110 redirect: 111 while (cp != NULL) { 112 if (!applies(cp)) { 113 cp = cp->next; 114 continue; 115 } 116 switch (cp->code) { 117 case '{': 118 cp = cp->u.c; 119 goto redirect; 120 case 'a': 121 if (appendx >= appendnum) 122 if ((appends = realloc(appends, 123 sizeof(struct s_appends) * 124 (appendnum *= 2))) == NULL) 125 err(1, "realloc"); 126 appends[appendx].type = AP_STRING; 127 appends[appendx].s = cp->t; 128 appends[appendx].len = strlen(cp->t); 129 appendx++; 130 break; 131 case 'b': 132 cp = cp->u.c; 133 goto redirect; 134 case 'c': 135 pd = 1; 136 psl = 0; 137 if (cp->a2 == NULL || lastaddr || lastline()) 138 (void)fprintf(outfile, "%s", cp->t); 139 break; 140 case 'd': 141 pd = 1; 142 goto new; 143 case 'D': 144 if (pd) 145 goto new; 146 if (psl == 0 || 147 (p = memchr(ps, '\n', psl)) == NULL) { 148 pd = 1; 149 goto new; 150 } else { 151 psl -= (p + 1) - ps; 152 memmove(ps, p + 1, psl); 153 goto top; 154 } 155 case 'g': 156 cspace(&PS, hs, hsl, REPLACE); 157 break; 158 case 'G': 159 cspace(&PS, "\n", 1, APPEND); 160 cspace(&PS, hs, hsl, APPEND); 161 break; 162 case 'h': 163 cspace(&HS, ps, psl, REPLACE); 164 break; 165 case 'H': 166 cspace(&HS, "\n", 1, APPEND); 167 cspace(&HS, ps, psl, APPEND); 168 break; 169 case 'i': 170 (void)fprintf(outfile, "%s", cp->t); 171 break; 172 case 'l': 173 lputs(ps, psl); 174 break; 175 case 'n': 176 if (!nflag && !pd) 177 OUT(); 178 flush_appends(); 179 if (!mf_fgets(&PS, REPLACE)) 180 exit(0); 181 pd = 0; 182 break; 183 case 'N': 184 flush_appends(); 185 cspace(&PS, "\n", 1, APPEND); 186 if (!mf_fgets(&PS, APPEND)) 187 exit(0); 188 break; 189 case 'p': 190 if (pd) 191 break; 192 OUT(); 193 break; 194 case 'P': 195 if (pd) 196 break; 197 if ((p = memchr(ps, '\n', psl)) != NULL) { 198 oldpsl = psl; 199 oldpsanl = psanl; 200 psl = p - ps; 201 psanl = 1; 202 } 203 OUT(); 204 if (p != NULL) { 205 psl = oldpsl; 206 psanl = oldpsanl; 207 } 208 break; 209 case 'q': 210 if (!nflag && !pd) 211 OUT(); 212 flush_appends(); 213 exit(0); 214 case 'r': 215 if (appendx >= appendnum) 216 if ((appends = realloc(appends, 217 sizeof(struct s_appends) * 218 (appendnum *= 2))) == NULL) 219 err(1, "realloc"); 220 appends[appendx].type = AP_FILE; 221 appends[appendx].s = cp->t; 222 appends[appendx].len = strlen(cp->t); 223 appendx++; 224 break; 225 case 's': 226 sdone |= substitute(cp); 227 break; 228 case 't': 229 if (sdone) { 230 sdone = 0; 231 cp = cp->u.c; 232 goto redirect; 233 } 234 break; 235 case 'w': 236 if (pd) 237 break; 238 if (cp->u.fd == -1 && (cp->u.fd = open(cp->t, 239 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, 240 DEFFILEMODE)) == -1) 241 err(1, "%s", cp->t); 242 if (write(cp->u.fd, ps, psl) != (ssize_t)psl || 243 write(cp->u.fd, "\n", 1) != 1) 244 err(1, "%s", cp->t); 245 break; 246 case 'x': 247 /* 248 * If the hold space is null, make it empty 249 * but not null. Otherwise the pattern space 250 * will become null after the swap, which is 251 * an abnormal condition. 252 */ 253 if (hs == NULL) 254 cspace(&HS, "", 0, REPLACE); 255 tspace = PS; 256 PS = HS; 257 psanl = tspace.append_newline; 258 HS = tspace; 259 break; 260 case 'y': 261 if (pd || psl == 0) 262 break; 263 do_tr(cp->u.y); 264 break; 265 case ':': 266 case '}': 267 break; 268 case '=': 269 (void)fprintf(outfile, "%lu\n", linenum); 270 } 271 cp = cp->next; 272 } /* for all cp */ 273 274 new: if (!nflag && !pd) 275 OUT(); 276 flush_appends(); 277 } /* for all lines */ 278 } 279 280 /* 281 * TRUE if the address passed matches the current program state 282 * (lastline, linenumber, ps). 283 */ 284 #define MATCH(a) \ 285 ((a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, 0, psl) : \ 286 (a)->type == AT_LINE ? linenum == (a)->u.l : lastline()) 287 288 /* 289 * Return TRUE if the command applies to the current line. Sets the start 290 * line for process ranges. Interprets the non-select (``!'') flag. 291 */ 292 static inline int 293 applies(struct s_command *cp) 294 { 295 int r; 296 297 lastaddr = 0; 298 if (cp->a1 == NULL && cp->a2 == NULL) 299 r = 1; 300 else if (cp->a2) 301 if (cp->startline > 0) { 302 switch (cp->a2->type) { 303 case AT_RELLINE: 304 if (linenum - cp->startline <= cp->a2->u.l) 305 r = 1; 306 else { 307 cp->startline = 0; 308 r = 0; 309 } 310 break; 311 default: 312 if (MATCH(cp->a2)) { 313 cp->startline = 0; 314 lastaddr = 1; 315 r = 1; 316 } else if (cp->a2->type == AT_LINE && 317 linenum > cp->a2->u.l) { 318 /* 319 * We missed the 2nd address due to a 320 * branch, so just close the range and 321 * return false. 322 */ 323 cp->startline = 0; 324 r = 0; 325 } else 326 r = 1; 327 } 328 } else if (cp->a1 && MATCH(cp->a1)) { 329 /* 330 * If the second address is a number less than or 331 * equal to the line number first selected, only 332 * one line shall be selected. 333 * -- POSIX 1003.2 334 * Likewise if the relative second line address is zero. 335 */ 336 if ((cp->a2->type == AT_LINE && 337 linenum >= cp->a2->u.l) || 338 (cp->a2->type == AT_RELLINE && cp->a2->u.l == 0)) 339 lastaddr = 1; 340 else { 341 cp->startline = linenum; 342 } 343 r = 1; 344 } else 345 r = 0; 346 else 347 r = MATCH(cp->a1); 348 return (cp->nonsel ? ! r : r); 349 } 350 351 /* 352 * Reset the sed processor to its initial state. 353 */ 354 void 355 resetstate(void) 356 { 357 struct s_command *cp; 358 359 /* 360 * Reset all in-range markers. 361 */ 362 for (cp = prog; cp; cp = cp->code == '{' ? cp->u.c : cp->next) 363 if (cp->a2) 364 cp->startline = 0; 365 366 /* 367 * Clear out the hold space. 368 */ 369 cspace(&HS, "", 0, REPLACE); 370 } 371 372 /* 373 * substitute -- 374 * Do substitutions in the pattern space. Currently, we build a 375 * copy of the new pattern space in the substitute space structure 376 * and then swap them. 377 */ 378 static int 379 substitute(struct s_command *cp) 380 { 381 SPACE tspace; 382 regex_t *re; 383 regoff_t slen; 384 int lastempty, n; 385 size_t le = 0; 386 char *s; 387 388 s = ps; 389 re = cp->u.s->re; 390 if (re == NULL) { 391 if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) { 392 linenum = cp->u.s->linenum; 393 errx(1, "%lu: %s: \\%u not defined in the RE", 394 linenum, fname, cp->u.s->maxbref); 395 } 396 } 397 if (!regexec_e(re, ps, 0, 0, 0, psl)) 398 return (0); 399 400 SS.len = 0; /* Clean substitute space. */ 401 slen = psl; 402 n = cp->u.s->n; 403 lastempty = 1; 404 405 do { 406 /* Copy the leading retained string. */ 407 if (n <= 1 && (match[0].rm_so > le)) 408 cspace(&SS, s, match[0].rm_so - le, APPEND); 409 410 /* Skip zero-length matches right after other matches. */ 411 if (lastempty || (match[0].rm_so - le) || 412 match[0].rm_so != match[0].rm_eo) { 413 if (n <= 1) { 414 /* Want this match: append replacement. */ 415 regsub(&SS, ps, cp->u.s->new); 416 if (n == 1) 417 n = -1; 418 } else { 419 /* Want a later match: append original. */ 420 if (match[0].rm_eo - le) 421 cspace(&SS, s, match[0].rm_eo - le, 422 APPEND); 423 n--; 424 } 425 } 426 427 /* Move past this match. */ 428 s = ps + match[0].rm_eo; 429 slen = psl - match[0].rm_eo; 430 le = match[0].rm_eo; 431 432 /* 433 * After a zero-length match, advance one byte, 434 * and at the end of the line, terminate. 435 */ 436 if (match[0].rm_so == match[0].rm_eo) { 437 if (*s == '\0' || *s == '\n') 438 slen = -1; 439 else 440 slen--; 441 if (*s != '\0') { 442 cspace(&SS, s++, 1, APPEND); 443 le++; 444 } 445 lastempty = 1; 446 } else 447 lastempty = 0; 448 449 } while (n >= 0 && slen >= 0 && 450 regexec_e(re, ps, REG_NOTBOL, 0, le, psl)); 451 452 /* Did not find the requested number of matches. */ 453 if (n > 1) 454 return (0); 455 456 /* Copy the trailing retained string. */ 457 if (slen > 0) 458 cspace(&SS, s, slen, APPEND); 459 460 /* 461 * Swap the substitute space and the pattern space, and make sure 462 * that any leftover pointers into stdio memory get lost. 463 */ 464 tspace = PS; 465 PS = SS; 466 psanl = tspace.append_newline; 467 SS = tspace; 468 SS.space = SS.back; 469 470 /* Handle the 'p' flag. */ 471 if (cp->u.s->p) 472 OUT(); 473 474 /* Handle the 'w' flag. */ 475 if (cp->u.s->wfile && !pd) { 476 if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile, 477 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1) 478 err(1, "%s", cp->u.s->wfile); 479 if (write(cp->u.s->wfd, ps, psl) != (ssize_t)psl || 480 write(cp->u.s->wfd, "\n", 1) != 1) 481 err(1, "%s", cp->u.s->wfile); 482 } 483 return (1); 484 } 485 486 /* 487 * do_tr -- 488 * Perform translation ('y' command) in the pattern space. 489 */ 490 static void 491 do_tr(struct s_tr *y) 492 { 493 SPACE tmp; 494 char c, *p; 495 size_t clen, left; 496 int i; 497 498 if (MB_CUR_MAX == 1) { 499 /* 500 * Single-byte encoding: perform in-place translation 501 * of the pattern space. 502 */ 503 for (p = ps; p < &ps[psl]; p++) 504 *p = y->bytetab[(u_char)*p]; 505 } else { 506 /* 507 * Multi-byte encoding: perform translation into the 508 * translation space, then swap the translation and 509 * pattern spaces. 510 */ 511 /* Clean translation space. */ 512 YS.len = 0; 513 for (p = ps, left = psl; left > 0; p += clen, left -= clen) { 514 if ((c = y->bytetab[(u_char)*p]) != '\0') { 515 cspace(&YS, &c, 1, APPEND); 516 clen = 1; 517 continue; 518 } 519 for (i = 0; i < y->nmultis; i++) 520 if (left >= y->multis[i].fromlen && 521 memcmp(p, y->multis[i].from, 522 y->multis[i].fromlen) == 0) 523 break; 524 if (i < y->nmultis) { 525 cspace(&YS, y->multis[i].to, 526 y->multis[i].tolen, APPEND); 527 clen = y->multis[i].fromlen; 528 } else { 529 cspace(&YS, p, 1, APPEND); 530 clen = 1; 531 } 532 } 533 /* Swap the translation space and the pattern space. */ 534 tmp = PS; 535 PS = YS; 536 psanl = tmp.append_newline; 537 YS = tmp; 538 YS.space = YS.back; 539 } 540 } 541 542 /* 543 * Flush append requests. Always called before reading a line, 544 * therefore it also resets the substitution done (sdone) flag. 545 */ 546 static void 547 flush_appends(void) 548 { 549 FILE *f; 550 int count, i; 551 char buf[8 * 1024]; 552 553 for (i = 0; i < appendx; i++) 554 switch (appends[i].type) { 555 case AP_STRING: 556 fwrite(appends[i].s, sizeof(char), appends[i].len, 557 outfile); 558 break; 559 case AP_FILE: 560 /* 561 * Read files probably shouldn't be cached. Since 562 * it's not an error to read a non-existent file, 563 * it's possible that another program is interacting 564 * with the sed script through the filesystem. It 565 * would be truly bizarre, but possible. It's probably 566 * not that big a performance win, anyhow. 567 */ 568 if ((f = fopen(appends[i].s, "r")) == NULL) 569 break; 570 while ((count = fread(buf, sizeof(char), sizeof(buf), f))) 571 (void)fwrite(buf, sizeof(char), count, outfile); 572 (void)fclose(f); 573 break; 574 } 575 if (ferror(outfile)) 576 errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO)); 577 appendx = sdone = 0; 578 } 579 580 static void 581 lputs(char *s, size_t len) 582 { 583 static const char escapes[] = "\\\a\b\f\r\t\v"; 584 int c, col, width; 585 const char *p; 586 struct winsize win; 587 static int termwidth = -1; 588 size_t clen, i; 589 wchar_t wc; 590 mbstate_t mbs; 591 592 if (outfile != stdout) 593 termwidth = 60; 594 if (termwidth == -1) { 595 if ((p = getenv("COLUMNS")) && *p != '\0') 596 termwidth = atoi(p); 597 else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 && 598 win.ws_col > 0) 599 termwidth = win.ws_col; 600 else 601 termwidth = 60; 602 } 603 if (termwidth <= 0) 604 termwidth = 1; 605 606 memset(&mbs, 0, sizeof(mbs)); 607 col = 0; 608 while (len != 0) { 609 clen = mbrtowc(&wc, s, len, &mbs); 610 if (clen == 0) 611 clen = 1; 612 if (clen == (size_t)-1 || clen == (size_t)-2) { 613 wc = (unsigned char)*s; 614 clen = 1; 615 memset(&mbs, 0, sizeof(mbs)); 616 } 617 if (wc == '\n') { 618 if (col + 1 >= termwidth) 619 fprintf(outfile, "\\\n"); 620 fputc('$', outfile); 621 fputc('\n', outfile); 622 col = 0; 623 } else if (iswprint(wc)) { 624 width = wcwidth(wc); 625 if (col + width >= termwidth) { 626 fprintf(outfile, "\\\n"); 627 col = 0; 628 } 629 fwrite(s, 1, clen, outfile); 630 col += width; 631 } else if (wc != L'\0' && (c = wctob(wc)) != EOF && 632 (p = strchr(escapes, c)) != NULL) { 633 if (col + 2 >= termwidth) { 634 fprintf(outfile, "\\\n"); 635 col = 0; 636 } 637 fprintf(outfile, "\\%c", "\\abfrtv"[p - escapes]); 638 col += 2; 639 } else { 640 if (col + 4 * clen >= (unsigned)termwidth) { 641 fprintf(outfile, "\\\n"); 642 col = 0; 643 } 644 for (i = 0; i < clen; i++) 645 fprintf(outfile, "\\%03o", 646 (int)(unsigned char)s[i]); 647 col += 4 * clen; 648 } 649 s += clen; 650 len -= clen; 651 } 652 if (col + 1 >= termwidth) 653 fprintf(outfile, "\\\n"); 654 (void)fputc('$', outfile); 655 (void)fputc('\n', outfile); 656 if (ferror(outfile)) 657 errx(1, "%s: %s", outfname, strerror(errno ? errno : EIO)); 658 } 659 660 static int 661 regexec_e(regex_t *preg, const char *string, int eflags, int nomatch, 662 size_t start, size_t stop) 663 { 664 int eval; 665 666 if (preg == NULL) { 667 if (defpreg == NULL) 668 errx(1, "first RE may not be empty"); 669 } else 670 defpreg = preg; 671 672 /* Set anchors */ 673 match[0].rm_so = start; 674 match[0].rm_eo = stop; 675 676 eval = regexec(defpreg, string, 677 nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND); 678 switch(eval) { 679 case 0: 680 return (1); 681 case REG_NOMATCH: 682 return (0); 683 } 684 errx(1, "RE error: %s", strregerror(eval, defpreg)); 685 /* NOTREACHED */ 686 } 687 688 /* 689 * regsub - perform substitutions after a regexp match 690 * Based on a routine by Henry Spencer 691 */ 692 static void 693 regsub(SPACE *sp, char *string, char *src) 694 { 695 int len, no; 696 char c, *dst; 697 698 #define NEEDSP(reqlen) \ 699 /* XXX What is the +1 for? */ \ 700 if (sp->len + (reqlen) + 1 >= sp->blen) { \ 701 sp->blen += (reqlen) + 1024; \ 702 if ((sp->space = sp->back = realloc(sp->back, sp->blen)) \ 703 == NULL) \ 704 err(1, "realloc"); \ 705 dst = sp->space + sp->len; \ 706 } 707 708 dst = sp->space + sp->len; 709 while ((c = *src++) != '\0') { 710 if (c == '&') 711 no = 0; 712 else if (c == '\\' && isdigit((unsigned char)*src)) 713 no = *src++ - '0'; 714 else 715 no = -1; 716 if (no < 0) { /* Ordinary character. */ 717 if (c == '\\' && (*src == '\\' || *src == '&')) 718 c = *src++; 719 NEEDSP(1); 720 *dst++ = c; 721 ++sp->len; 722 } else if (match[no].rm_so != -1 && match[no].rm_eo != -1) { 723 len = match[no].rm_eo - match[no].rm_so; 724 NEEDSP(len); 725 memmove(dst, string + match[no].rm_so, len); 726 dst += len; 727 sp->len += len; 728 } 729 } 730 NEEDSP(1); 731 *dst = '\0'; 732 } 733 734 /* 735 * cspace -- 736 * Concatenate space: append the source space to the destination space, 737 * allocating new space as necessary. 738 */ 739 void 740 cspace(SPACE *sp, const char *p, size_t len, enum e_spflag spflag) 741 { 742 size_t tlen; 743 744 /* Make sure SPACE has enough memory and ramp up quickly. */ 745 tlen = sp->len + len + 1; 746 if (tlen > sp->blen) { 747 sp->blen = tlen + 1024; 748 if ((sp->space = sp->back = realloc(sp->back, sp->blen)) == 749 NULL) 750 err(1, "realloc"); 751 } 752 753 if (spflag == REPLACE) 754 sp->len = 0; 755 756 memmove(sp->space + sp->len, p, len); 757 758 sp->space[sp->len += len] = '\0'; 759 } 760 761 /* 762 * Close all cached opened files and report any errors 763 */ 764 void 765 cfclose(struct s_command *cp, struct s_command *end) 766 { 767 768 for (; cp != end; cp = cp->next) 769 switch(cp->code) { 770 case 's': 771 if (cp->u.s->wfd != -1 && close(cp->u.s->wfd)) 772 err(1, "%s", cp->u.s->wfile); 773 cp->u.s->wfd = -1; 774 break; 775 case 'w': 776 if (cp->u.fd != -1 && close(cp->u.fd)) 777 err(1, "%s", cp->t); 778 cp->u.fd = -1; 779 break; 780 case '{': 781 cfclose(cp->u.c, cp->next); 782 break; 783 } 784 } 785