1 /* $Vendor-Id: read.c,v 1.25 2011/10/08 15:42:29 kristaps Exp $ */ 2 /* 3 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv> 4 * Copyright (c) 2010, 2011 Ingo Schwarze <schwarze@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 #ifdef HAVE_CONFIG_H 19 #include "config.h" 20 #endif 21 22 #ifdef HAVE_MMAP 23 # include <sys/stat.h> 24 # include <sys/mman.h> 25 #endif 26 27 #include <assert.h> 28 #include <ctype.h> 29 #include <fcntl.h> 30 #include <stdarg.h> 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <unistd.h> 35 36 #include "mandoc.h" 37 #include "libmandoc.h" 38 #include "mdoc.h" 39 #include "man.h" 40 41 #ifndef MAP_FILE 42 #define MAP_FILE 0 43 #endif 44 45 #define REPARSE_LIMIT 1000 46 47 struct buf { 48 char *buf; /* binary input buffer */ 49 size_t sz; /* size of binary buffer */ 50 }; 51 52 struct mparse { 53 enum mandoclevel file_status; /* status of current parse */ 54 enum mandoclevel wlevel; /* ignore messages below this */ 55 int line; /* line number in the file */ 56 enum mparset inttype; /* which parser to use */ 57 struct man *pman; /* persistent man parser */ 58 struct mdoc *pmdoc; /* persistent mdoc parser */ 59 struct man *man; /* man parser */ 60 struct mdoc *mdoc; /* mdoc parser */ 61 struct roff *roff; /* roff parser (!NULL) */ 62 int reparse_count; /* finite interp. stack */ 63 mandocmsg mmsg; /* warning/error message handler */ 64 void *arg; /* argument to mmsg */ 65 const char *file; 66 struct buf *secondary; 67 }; 68 69 static void resize_buf(struct buf *, size_t); 70 static void mparse_buf_r(struct mparse *, struct buf, int); 71 static void mparse_readfd_r(struct mparse *, int, const char *, int); 72 static void pset(const char *, int, struct mparse *); 73 static void pdesc(struct mparse *, const char *, int); 74 static int read_whole_file(const char *, int, struct buf *, int *); 75 static void mparse_end(struct mparse *); 76 77 static const enum mandocerr mandoclimits[MANDOCLEVEL_MAX] = { 78 MANDOCERR_OK, 79 MANDOCERR_WARNING, 80 MANDOCERR_WARNING, 81 MANDOCERR_ERROR, 82 MANDOCERR_FATAL, 83 MANDOCERR_MAX, 84 MANDOCERR_MAX 85 }; 86 87 static const char * const mandocerrs[MANDOCERR_MAX] = { 88 "ok", 89 90 "generic warning", 91 92 /* related to the prologue */ 93 "no title in document", 94 "document title should be all caps", 95 "unknown manual section", 96 "date missing, using today's date", 97 "cannot parse date, using it verbatim", 98 "prologue macros out of order", 99 "duplicate prologue macro", 100 "macro not allowed in prologue", 101 "macro not allowed in body", 102 103 /* related to document structure */ 104 ".so is fragile, better use ln(1)", 105 "NAME section must come first", 106 "bad NAME section contents", 107 "manual name not yet set", 108 "sections out of conventional order", 109 "duplicate section name", 110 "section not in conventional manual section", 111 112 /* related to macros and nesting */ 113 "skipping obsolete macro", 114 "skipping paragraph macro", 115 "skipping no-space macro", 116 "blocks badly nested", 117 "child violates parent syntax", 118 "nested displays are not portable", 119 "already in literal mode", 120 "line scope broken", 121 122 /* related to missing macro arguments */ 123 "skipping empty macro", 124 "argument count wrong", 125 "missing display type", 126 "list type must come first", 127 "tag lists require a width argument", 128 "missing font type", 129 "skipping end of block that is not open", 130 131 /* related to bad macro arguments */ 132 "skipping argument", 133 "duplicate argument", 134 "duplicate display type", 135 "duplicate list type", 136 "unknown AT&T UNIX version", 137 "bad Boolean value", 138 "unknown font", 139 "unknown standard specifier", 140 "bad width argument", 141 142 /* related to plain text */ 143 "blank line in non-literal context", 144 "tab in non-literal context", 145 "end of line whitespace", 146 "bad comment style", 147 "bad escape sequence", 148 "unterminated quoted string", 149 150 /* related to equations */ 151 "unexpected literal in equation", 152 153 "generic error", 154 155 /* related to equations */ 156 "unexpected equation scope closure", 157 "equation scope open on exit", 158 "overlapping equation scopes", 159 "unexpected end of equation", 160 "equation syntax error", 161 162 /* related to tables */ 163 "bad table syntax", 164 "bad table option", 165 "bad table layout", 166 "no table layout cells specified", 167 "no table data cells specified", 168 "ignore data in cell", 169 "data block still open", 170 "ignoring extra data cells", 171 172 "input stack limit exceeded, infinite loop?", 173 "skipping bad character", 174 "escaped character not allowed in a name", 175 "skipping text before the first section header", 176 "skipping unknown macro", 177 "NOT IMPLEMENTED, please use groff: skipping request", 178 "argument count wrong", 179 "skipping end of block that is not open", 180 "missing end of block", 181 "scope open on exit", 182 "uname(3) system call failed", 183 "macro requires line argument(s)", 184 "macro requires body argument(s)", 185 "macro requires argument(s)", 186 "missing list type", 187 "line argument(s) will be lost", 188 "body argument(s) will be lost", 189 190 "generic fatal error", 191 192 "not a manual", 193 "column syntax is inconsistent", 194 "NOT IMPLEMENTED: .Bd -file", 195 "line scope broken, syntax violated", 196 "argument count wrong, violates syntax", 197 "child violates parent syntax", 198 "argument count wrong, violates syntax", 199 "NOT IMPLEMENTED: .so with absolute path or \"..\"", 200 "no document body", 201 "no document prologue", 202 "static buffer exhausted", 203 }; 204 205 static const char * const mandoclevels[MANDOCLEVEL_MAX] = { 206 "SUCCESS", 207 "RESERVED", 208 "WARNING", 209 "ERROR", 210 "FATAL", 211 "BADARG", 212 "SYSERR" 213 }; 214 215 static void 216 resize_buf(struct buf *buf, size_t initial) 217 { 218 219 buf->sz = buf->sz > initial/2 ? 2 * buf->sz : initial; 220 buf->buf = mandoc_realloc(buf->buf, buf->sz); 221 } 222 223 static void 224 pset(const char *buf, int pos, struct mparse *curp) 225 { 226 int i; 227 228 /* 229 * Try to intuit which kind of manual parser should be used. If 230 * passed in by command-line (-man, -mdoc), then use that 231 * explicitly. If passed as -mandoc, then try to guess from the 232 * line: either skip dot-lines, use -mdoc when finding `.Dt', or 233 * default to -man, which is more lenient. 234 * 235 * Separate out pmdoc/pman from mdoc/man: the first persists 236 * through all parsers, while the latter is used per-parse. 237 */ 238 239 if ('.' == buf[0] || '\'' == buf[0]) { 240 for (i = 1; buf[i]; i++) 241 if (' ' != buf[i] && '\t' != buf[i]) 242 break; 243 if ('\0' == buf[i]) 244 return; 245 } 246 247 switch (curp->inttype) { 248 case (MPARSE_MDOC): 249 if (NULL == curp->pmdoc) 250 curp->pmdoc = mdoc_alloc(curp->roff, curp); 251 assert(curp->pmdoc); 252 curp->mdoc = curp->pmdoc; 253 return; 254 case (MPARSE_MAN): 255 if (NULL == curp->pman) 256 curp->pman = man_alloc(curp->roff, curp); 257 assert(curp->pman); 258 curp->man = curp->pman; 259 return; 260 default: 261 break; 262 } 263 264 if (pos >= 3 && 0 == memcmp(buf, ".Dd", 3)) { 265 if (NULL == curp->pmdoc) 266 curp->pmdoc = mdoc_alloc(curp->roff, curp); 267 assert(curp->pmdoc); 268 curp->mdoc = curp->pmdoc; 269 return; 270 } 271 272 if (NULL == curp->pman) 273 curp->pman = man_alloc(curp->roff, curp); 274 assert(curp->pman); 275 curp->man = curp->pman; 276 } 277 278 /* 279 * Main parse routine for an opened file. This is called for each 280 * opened file and simply loops around the full input file, possibly 281 * nesting (i.e., with `so'). 282 */ 283 static void 284 mparse_buf_r(struct mparse *curp, struct buf blk, int start) 285 { 286 const struct tbl_span *span; 287 struct buf ln; 288 enum rofferr rr; 289 int i, of, rc; 290 int pos; /* byte number in the ln buffer */ 291 int lnn; /* line number in the real file */ 292 unsigned char c; 293 294 memset(&ln, 0, sizeof(struct buf)); 295 296 lnn = curp->line; 297 pos = 0; 298 299 for (i = 0; i < (int)blk.sz; ) { 300 if (0 == pos && '\0' == blk.buf[i]) 301 break; 302 303 if (start) { 304 curp->line = lnn; 305 curp->reparse_count = 0; 306 } 307 308 while (i < (int)blk.sz && (start || '\0' != blk.buf[i])) { 309 310 /* 311 * When finding an unescaped newline character, 312 * leave the character loop to process the line. 313 * Skip a preceding carriage return, if any. 314 */ 315 316 if ('\r' == blk.buf[i] && i + 1 < (int)blk.sz && 317 '\n' == blk.buf[i + 1]) 318 ++i; 319 if ('\n' == blk.buf[i]) { 320 ++i; 321 ++lnn; 322 break; 323 } 324 325 /* 326 * Warn about bogus characters. If you're using 327 * non-ASCII encoding, you're screwing your 328 * readers. Since I'd rather this not happen, 329 * I'll be helpful and drop these characters so 330 * we don't display gibberish. Note to manual 331 * writers: use special characters. 332 */ 333 334 c = (unsigned char) blk.buf[i]; 335 336 if ( ! (isascii(c) && 337 (isgraph(c) || isblank(c)))) { 338 mandoc_msg(MANDOCERR_BADCHAR, curp, 339 curp->line, pos, "ignoring byte"); 340 i++; 341 continue; 342 } 343 344 /* Trailing backslash = a plain char. */ 345 346 if ('\\' != blk.buf[i] || i + 1 == (int)blk.sz) { 347 if (pos >= (int)ln.sz) 348 resize_buf(&ln, 256); 349 ln.buf[pos++] = blk.buf[i++]; 350 continue; 351 } 352 353 /* 354 * Found escape and at least one other character. 355 * When it's a newline character, skip it. 356 * When there is a carriage return in between, 357 * skip that one as well. 358 */ 359 360 if ('\r' == blk.buf[i + 1] && i + 2 < (int)blk.sz && 361 '\n' == blk.buf[i + 2]) 362 ++i; 363 if ('\n' == blk.buf[i + 1]) { 364 i += 2; 365 ++lnn; 366 continue; 367 } 368 369 if ('"' == blk.buf[i + 1] || '#' == blk.buf[i + 1]) { 370 i += 2; 371 /* Comment, skip to end of line */ 372 for (; i < (int)blk.sz; ++i) { 373 if ('\n' == blk.buf[i]) { 374 ++i; 375 ++lnn; 376 break; 377 } 378 } 379 380 /* Backout trailing whitespaces */ 381 for (; pos > 0; --pos) { 382 if (ln.buf[pos - 1] != ' ') 383 break; 384 if (pos > 2 && ln.buf[pos - 2] == '\\') 385 break; 386 } 387 break; 388 } 389 390 /* Some other escape sequence, copy & cont. */ 391 392 if (pos + 1 >= (int)ln.sz) 393 resize_buf(&ln, 256); 394 395 ln.buf[pos++] = blk.buf[i++]; 396 ln.buf[pos++] = blk.buf[i++]; 397 } 398 399 if (pos >= (int)ln.sz) 400 resize_buf(&ln, 256); 401 402 ln.buf[pos] = '\0'; 403 404 /* 405 * A significant amount of complexity is contained by 406 * the roff preprocessor. It's line-oriented but can be 407 * expressed on one line, so we need at times to 408 * readjust our starting point and re-run it. The roff 409 * preprocessor can also readjust the buffers with new 410 * data, so we pass them in wholesale. 411 */ 412 413 of = 0; 414 415 /* 416 * Maintain a lookaside buffer of all parsed lines. We 417 * only do this if mparse_keep() has been invoked (the 418 * buffer may be accessed with mparse_getkeep()). 419 */ 420 421 if (curp->secondary) { 422 curp->secondary->buf = 423 mandoc_realloc 424 (curp->secondary->buf, 425 curp->secondary->sz + pos + 2); 426 memcpy(curp->secondary->buf + 427 curp->secondary->sz, 428 ln.buf, pos); 429 curp->secondary->sz += pos; 430 curp->secondary->buf 431 [curp->secondary->sz] = '\n'; 432 curp->secondary->sz++; 433 curp->secondary->buf 434 [curp->secondary->sz] = '\0'; 435 } 436 rerun: 437 rr = roff_parseln 438 (curp->roff, curp->line, 439 &ln.buf, &ln.sz, of, &of); 440 441 switch (rr) { 442 case (ROFF_REPARSE): 443 if (REPARSE_LIMIT >= ++curp->reparse_count) 444 mparse_buf_r(curp, ln, 0); 445 else 446 mandoc_msg(MANDOCERR_ROFFLOOP, curp, 447 curp->line, pos, NULL); 448 pos = 0; 449 continue; 450 case (ROFF_APPEND): 451 pos = (int)strlen(ln.buf); 452 continue; 453 case (ROFF_RERUN): 454 goto rerun; 455 case (ROFF_IGN): 456 pos = 0; 457 continue; 458 case (ROFF_ERR): 459 assert(MANDOCLEVEL_FATAL <= curp->file_status); 460 break; 461 case (ROFF_SO): 462 /* 463 * We remove `so' clauses from our lookaside 464 * buffer because we're going to descend into 465 * the file recursively. 466 */ 467 if (curp->secondary) 468 curp->secondary->sz -= pos + 1; 469 mparse_readfd_r(curp, -1, ln.buf + of, 1); 470 if (MANDOCLEVEL_FATAL <= curp->file_status) 471 break; 472 pos = 0; 473 continue; 474 default: 475 break; 476 } 477 478 /* 479 * If we encounter errors in the recursive parse, make 480 * sure we don't continue parsing. 481 */ 482 483 if (MANDOCLEVEL_FATAL <= curp->file_status) 484 break; 485 486 /* 487 * If input parsers have not been allocated, do so now. 488 * We keep these instanced between parsers, but set them 489 * locally per parse routine since we can use different 490 * parsers with each one. 491 */ 492 493 if ( ! (curp->man || curp->mdoc)) 494 pset(ln.buf + of, pos - of, curp); 495 496 /* 497 * Lastly, push down into the parsers themselves. One 498 * of these will have already been set in the pset() 499 * routine. 500 * If libroff returns ROFF_TBL, then add it to the 501 * currently open parse. Since we only get here if 502 * there does exist data (see tbl_data.c), we're 503 * guaranteed that something's been allocated. 504 * Do the same for ROFF_EQN. 505 */ 506 507 rc = -1; 508 509 if (ROFF_TBL == rr) 510 while (NULL != (span = roff_span(curp->roff))) { 511 rc = curp->man ? 512 man_addspan(curp->man, span) : 513 mdoc_addspan(curp->mdoc, span); 514 if (0 == rc) 515 break; 516 } 517 else if (ROFF_EQN == rr) 518 rc = curp->mdoc ? 519 mdoc_addeqn(curp->mdoc, 520 roff_eqn(curp->roff)) : 521 man_addeqn(curp->man, 522 roff_eqn(curp->roff)); 523 else if (curp->man || curp->mdoc) 524 rc = curp->man ? 525 man_parseln(curp->man, 526 curp->line, ln.buf, of) : 527 mdoc_parseln(curp->mdoc, 528 curp->line, ln.buf, of); 529 530 if (0 == rc) { 531 assert(MANDOCLEVEL_FATAL <= curp->file_status); 532 break; 533 } 534 535 /* Temporary buffers typically are not full. */ 536 537 if (0 == start && '\0' == blk.buf[i]) 538 break; 539 540 /* Start the next input line. */ 541 542 pos = 0; 543 } 544 545 free(ln.buf); 546 } 547 548 static void 549 pdesc(struct mparse *curp, const char *file, int fd) 550 { 551 struct buf blk; 552 int with_mmap; 553 554 /* 555 * Run for each opened file; may be called more than once for 556 * each full parse sequence if the opened file is nested (i.e., 557 * from `so'). Simply sucks in the whole file and moves into 558 * the parse phase for the file. 559 */ 560 561 if ( ! read_whole_file(file, fd, &blk, &with_mmap)) { 562 curp->file_status = MANDOCLEVEL_SYSERR; 563 return; 564 } 565 566 /* Line number is per-file. */ 567 568 curp->line = 1; 569 570 mparse_buf_r(curp, blk, 1); 571 572 #ifdef HAVE_MMAP 573 if (with_mmap) 574 munmap(blk.buf, blk.sz); 575 else 576 #endif 577 free(blk.buf); 578 } 579 580 static int 581 read_whole_file(const char *file, int fd, struct buf *fb, int *with_mmap) 582 { 583 size_t off; 584 ssize_t ssz; 585 586 #ifdef HAVE_MMAP 587 struct stat st; 588 if (-1 == fstat(fd, &st)) { 589 perror(file); 590 return(0); 591 } 592 593 /* 594 * If we're a regular file, try just reading in the whole entry 595 * via mmap(). This is faster than reading it into blocks, and 596 * since each file is only a few bytes to begin with, I'm not 597 * concerned that this is going to tank any machines. 598 */ 599 600 if (S_ISREG(st.st_mode)) { 601 if (st.st_size >= (1U << 31)) { 602 fprintf(stderr, "%s: input too large\n", file); 603 return(0); 604 } 605 *with_mmap = 1; 606 fb->sz = (size_t)st.st_size; 607 fb->buf = mmap(NULL, fb->sz, PROT_READ, 608 MAP_FILE|MAP_SHARED, fd, 0); 609 if (fb->buf != MAP_FAILED) 610 return(1); 611 } 612 #endif 613 614 /* 615 * If this isn't a regular file (like, say, stdin), then we must 616 * go the old way and just read things in bit by bit. 617 */ 618 619 *with_mmap = 0; 620 off = 0; 621 fb->sz = 0; 622 fb->buf = NULL; 623 for (;;) { 624 if (off == fb->sz) { 625 if (fb->sz == (1U << 31)) { 626 fprintf(stderr, "%s: input too large\n", file); 627 break; 628 } 629 resize_buf(fb, 65536); 630 } 631 ssz = read(fd, fb->buf + (int)off, fb->sz - off); 632 if (ssz == 0) { 633 fb->sz = off; 634 return(1); 635 } 636 if (ssz == -1) { 637 perror(file); 638 break; 639 } 640 off += (size_t)ssz; 641 } 642 643 free(fb->buf); 644 fb->buf = NULL; 645 return(0); 646 } 647 648 static void 649 mparse_end(struct mparse *curp) 650 { 651 652 if (MANDOCLEVEL_FATAL <= curp->file_status) 653 return; 654 655 if (curp->mdoc && ! mdoc_endparse(curp->mdoc)) { 656 assert(MANDOCLEVEL_FATAL <= curp->file_status); 657 return; 658 } 659 660 if (curp->man && ! man_endparse(curp->man)) { 661 assert(MANDOCLEVEL_FATAL <= curp->file_status); 662 return; 663 } 664 665 if ( ! (curp->man || curp->mdoc)) { 666 mandoc_msg(MANDOCERR_NOTMANUAL, curp, 1, 0, NULL); 667 curp->file_status = MANDOCLEVEL_FATAL; 668 return; 669 } 670 671 roff_endparse(curp->roff); 672 } 673 674 static void 675 mparse_readfd_r(struct mparse *curp, int fd, const char *file, int re) 676 { 677 const char *svfile; 678 679 if (-1 == fd) 680 if (-1 == (fd = open(file, O_RDONLY, 0))) { 681 perror(file); 682 curp->file_status = MANDOCLEVEL_SYSERR; 683 return; 684 } 685 686 svfile = curp->file; 687 curp->file = file; 688 689 pdesc(curp, file, fd); 690 691 if (0 == re && MANDOCLEVEL_FATAL > curp->file_status) 692 mparse_end(curp); 693 694 if (STDIN_FILENO != fd && -1 == close(fd)) 695 perror(file); 696 697 curp->file = svfile; 698 } 699 700 enum mandoclevel 701 mparse_readfd(struct mparse *curp, int fd, const char *file) 702 { 703 704 mparse_readfd_r(curp, fd, file, 0); 705 return(curp->file_status); 706 } 707 708 struct mparse * 709 mparse_alloc(enum mparset inttype, enum mandoclevel wlevel, mandocmsg mmsg, void *arg) 710 { 711 struct mparse *curp; 712 713 assert(wlevel <= MANDOCLEVEL_FATAL); 714 715 curp = mandoc_calloc(1, sizeof(struct mparse)); 716 717 curp->wlevel = wlevel; 718 curp->mmsg = mmsg; 719 curp->arg = arg; 720 curp->inttype = inttype; 721 722 curp->roff = roff_alloc(curp); 723 return(curp); 724 } 725 726 void 727 mparse_reset(struct mparse *curp) 728 { 729 730 roff_reset(curp->roff); 731 732 if (curp->mdoc) 733 mdoc_reset(curp->mdoc); 734 if (curp->man) 735 man_reset(curp->man); 736 if (curp->secondary) 737 curp->secondary->sz = 0; 738 739 curp->file_status = MANDOCLEVEL_OK; 740 curp->mdoc = NULL; 741 curp->man = NULL; 742 } 743 744 void 745 mparse_free(struct mparse *curp) 746 { 747 748 if (curp->pmdoc) 749 mdoc_free(curp->pmdoc); 750 if (curp->pman) 751 man_free(curp->pman); 752 if (curp->roff) 753 roff_free(curp->roff); 754 if (curp->secondary) 755 free(curp->secondary->buf); 756 757 free(curp->secondary); 758 free(curp); 759 } 760 761 void 762 mparse_result(struct mparse *curp, struct mdoc **mdoc, struct man **man) 763 { 764 765 if (mdoc) 766 *mdoc = curp->mdoc; 767 if (man) 768 *man = curp->man; 769 } 770 771 void 772 mandoc_vmsg(enum mandocerr t, struct mparse *m, 773 int ln, int pos, const char *fmt, ...) 774 { 775 char buf[256]; 776 va_list ap; 777 778 va_start(ap, fmt); 779 vsnprintf(buf, sizeof(buf) - 1, fmt, ap); 780 va_end(ap); 781 782 mandoc_msg(t, m, ln, pos, buf); 783 } 784 785 void 786 mandoc_msg(enum mandocerr er, struct mparse *m, 787 int ln, int col, const char *msg) 788 { 789 enum mandoclevel level; 790 791 level = MANDOCLEVEL_FATAL; 792 while (er < mandoclimits[level]) 793 level--; 794 795 if (level < m->wlevel) 796 return; 797 798 if (m->mmsg) 799 (*m->mmsg)(er, level, m->file, ln, col, msg); 800 801 if (m->file_status < level) 802 m->file_status = level; 803 } 804 805 const char * 806 mparse_strerror(enum mandocerr er) 807 { 808 809 return(mandocerrs[er]); 810 } 811 812 const char * 813 mparse_strlevel(enum mandoclevel lvl) 814 { 815 return(mandoclevels[lvl]); 816 } 817 818 void 819 mparse_keep(struct mparse *p) 820 { 821 822 assert(NULL == p->secondary); 823 p->secondary = mandoc_calloc(1, sizeof(struct buf)); 824 } 825 826 const char * 827 mparse_getkeep(const struct mparse *p) 828 { 829 830 assert(p->secondary); 831 return(p->secondary->sz ? p->secondary->buf : NULL); 832 } 833