xref: /freebsd/contrib/mandoc/read.c (revision 924226fba12cc9a228c73b956e1b7fa24c60b055) 
1 /* $Id: read.c,v 1.220 2021/06/27 17:57:54 schwarze Exp $ */
2 /*
3  * Copyright (c) 2010-2020 Ingo Schwarze <schwarze@openbsd.org>
4  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
5  * Copyright (c) 2010, 2012 Joerg Sonnenberger <joerg@netbsd.org>
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  *
19  * Top-level functions of the mandoc(3) parser:
20  * Parser and input encoding selection, decompression,
21  * handling of input bytes, characters, lines, and files,
22  * handling of roff(7) loops and file inclusion,
23  * and steering of the various parsers.
24  */
25 #include "config.h"
26 
27 #include <sys/types.h>
28 #include <sys/mman.h>
29 #include <sys/stat.h>
30 
31 #include <assert.h>
32 #include <ctype.h>
33 #include <errno.h>
34 #include <fcntl.h>
35 #include <stdarg.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <unistd.h>
40 #include <zlib.h>
41 
42 #include "mandoc_aux.h"
43 #include "mandoc.h"
44 #include "roff.h"
45 #include "mdoc.h"
46 #include "man.h"
47 #include "mandoc_parse.h"
48 #include "libmandoc.h"
49 #include "roff_int.h"
50 #include "tag.h"
51 
52 #define	REPARSE_LIMIT	1000
53 
54 struct	mparse {
55 	struct roff	 *roff; /* roff parser (!NULL) */
56 	struct roff_man	 *man; /* man parser */
57 	struct buf	 *primary; /* buffer currently being parsed */
58 	struct buf	 *secondary; /* copy of top level input */
59 	struct buf	 *loop; /* open .while request line */
60 	const char	 *os_s; /* default operating system */
61 	int		  options; /* parser options */
62 	int		  gzip; /* current input file is gzipped */
63 	int		  filenc; /* encoding of the current file */
64 	int		  reparse_count; /* finite interp. stack */
65 	int		  line; /* line number in the file */
66 };
67 
68 static	void	  choose_parser(struct mparse *);
69 static	void	  free_buf_list(struct buf *);
70 static	void	  resize_buf(struct buf *, size_t);
71 static	int	  mparse_buf_r(struct mparse *, struct buf, size_t, int);
72 static	int	  read_whole_file(struct mparse *, int, struct buf *, int *);
73 static	void	  mparse_end(struct mparse *);
74 
75 
76 static void
77 resize_buf(struct buf *buf, size_t initial)
78 {
79 
80 	buf->sz = buf->sz > initial/2 ? 2 * buf->sz : initial;
81 	buf->buf = mandoc_realloc(buf->buf, buf->sz);
82 }
83 
84 static void
85 free_buf_list(struct buf *buf)
86 {
87 	struct buf *tmp;
88 
89 	while (buf != NULL) {
90 		tmp = buf;
91 		buf = tmp->next;
92 		free(tmp->buf);
93 		free(tmp);
94 	}
95 }
96 
97 static void
98 choose_parser(struct mparse *curp)
99 {
100 	char		*cp, *ep;
101 	int		 format;
102 
103 	/*
104 	 * If neither command line arguments -mdoc or -man select
105 	 * a parser nor the roff parser found a .Dd or .TH macro
106 	 * yet, look ahead in the main input buffer.
107 	 */
108 
109 	if ((format = roff_getformat(curp->roff)) == 0) {
110 		cp = curp->primary->buf;
111 		ep = cp + curp->primary->sz;
112 		while (cp < ep) {
113 			if (*cp == '.' || *cp == '\'') {
114 				cp++;
115 				if (cp[0] == 'D' && cp[1] == 'd') {
116 					format = MPARSE_MDOC;
117 					break;
118 				}
119 				if (cp[0] == 'T' && cp[1] == 'H') {
120 					format = MPARSE_MAN;
121 					break;
122 				}
123 			}
124 			cp = memchr(cp, '\n', ep - cp);
125 			if (cp == NULL)
126 				break;
127 			cp++;
128 		}
129 	}
130 
131 	if (format == MPARSE_MDOC) {
132 		curp->man->meta.macroset = MACROSET_MDOC;
133 		if (curp->man->mdocmac == NULL)
134 			curp->man->mdocmac = roffhash_alloc(MDOC_Dd, MDOC_MAX);
135 	} else {
136 		curp->man->meta.macroset = MACROSET_MAN;
137 		if (curp->man->manmac == NULL)
138 			curp->man->manmac = roffhash_alloc(MAN_TH, MAN_MAX);
139 	}
140 	curp->man->meta.first->tok = TOKEN_NONE;
141 }
142 
143 /*
144  * Main parse routine for a buffer.
145  * It assumes encoding and line numbering are already set up.
146  * It can recurse directly (for invocations of user-defined
147  * macros, inline equations, and input line traps)
148  * and indirectly (for .so file inclusion).
149  */
150 static int
151 mparse_buf_r(struct mparse *curp, struct buf blk, size_t i, int start)
152 {
153 	struct buf	 ln;
154 	struct buf	*firstln, *lastln, *thisln, *loop;
155 	char		*cp;
156 	size_t		 pos; /* byte number in the ln buffer */
157 	size_t		 spos; /* at the start of the current line parse */
158 	int		 line_result, result;
159 	int		 of;
160 	int		 lnn; /* line number in the real file */
161 	int		 fd;
162 	int		 inloop; /* Saw .while on this level. */
163 	unsigned char	 c;
164 
165 	ln.sz = 256;
166 	ln.buf = mandoc_malloc(ln.sz);
167 	ln.next = NULL;
168 	firstln = lastln = loop = NULL;
169 	lnn = curp->line;
170 	pos = 0;
171 	inloop = 0;
172 	result = ROFF_CONT;
173 
174 	while (i < blk.sz && (blk.buf[i] != '\0' || pos != 0)) {
175 		if (start) {
176 			curp->line = lnn;
177 			curp->reparse_count = 0;
178 
179 			if (lnn < 3 &&
180 			    curp->filenc & MPARSE_UTF8 &&
181 			    curp->filenc & MPARSE_LATIN1)
182 				curp->filenc = preconv_cue(&blk, i);
183 		}
184 		spos = pos;
185 
186 		while (i < blk.sz && (start || blk.buf[i] != '\0')) {
187 
188 			/*
189 			 * When finding an unescaped newline character,
190 			 * leave the character loop to process the line.
191 			 * Skip a preceding carriage return, if any.
192 			 */
193 
194 			if ('\r' == blk.buf[i] && i + 1 < blk.sz &&
195 			    '\n' == blk.buf[i + 1])
196 				++i;
197 			if ('\n' == blk.buf[i]) {
198 				++i;
199 				++lnn;
200 				break;
201 			}
202 
203 			/*
204 			 * Make sure we have space for the worst
205 			 * case of 12 bytes: "\\[u10ffff]\n\0"
206 			 */
207 
208 			if (pos + 12 > ln.sz)
209 				resize_buf(&ln, 256);
210 
211 			/*
212 			 * Encode 8-bit input.
213 			 */
214 
215 			c = blk.buf[i];
216 			if (c & 0x80) {
217 				if ( ! (curp->filenc && preconv_encode(
218 				    &blk, &i, &ln, &pos, &curp->filenc))) {
219 					mandoc_msg(MANDOCERR_CHAR_BAD,
220 					    curp->line, pos, "0x%x", c);
221 					ln.buf[pos++] = '?';
222 					i++;
223 				}
224 				continue;
225 			}
226 
227 			/*
228 			 * Exclude control characters.
229 			 */
230 
231 			if (c == 0x7f || (c < 0x20 && c != 0x09)) {
232 				mandoc_msg(c == 0x00 || c == 0x04 ||
233 				    c > 0x0a ? MANDOCERR_CHAR_BAD :
234 				    MANDOCERR_CHAR_UNSUPP,
235 				    curp->line, pos, "0x%x", c);
236 				i++;
237 				if (c != '\r')
238 					ln.buf[pos++] = '?';
239 				continue;
240 			}
241 
242 			ln.buf[pos++] = blk.buf[i++];
243 		}
244 		ln.buf[pos] = '\0';
245 
246 		/*
247 		 * Maintain a lookaside buffer of all lines.
248 		 * parsed from this input source.
249 		 */
250 
251 		thisln = mandoc_malloc(sizeof(*thisln));
252 		thisln->buf = mandoc_strdup(ln.buf);
253 		thisln->sz = strlen(ln.buf) + 1;
254 		thisln->next = NULL;
255 		if (firstln == NULL) {
256 			firstln = lastln = thisln;
257 			if (curp->secondary == NULL)
258 				curp->secondary = firstln;
259 		} else {
260 			lastln->next = thisln;
261 			lastln = thisln;
262 		}
263 
264 		/* XXX Ugly hack to mark the end of the input. */
265 
266 		if (i == blk.sz || blk.buf[i] == '\0') {
267 			if (pos + 2 > ln.sz)
268 				resize_buf(&ln, 256);
269 			ln.buf[pos++] = '\n';
270 			ln.buf[pos] = '\0';
271 		}
272 
273 		/*
274 		 * A significant amount of complexity is contained by
275 		 * the roff preprocessor.  It's line-oriented but can be
276 		 * expressed on one line, so we need at times to
277 		 * readjust our starting point and re-run it.  The roff
278 		 * preprocessor can also readjust the buffers with new
279 		 * data, so we pass them in wholesale.
280 		 */
281 
282 		of = 0;
283 rerun:
284 		line_result = roff_parseln(curp->roff, curp->line,
285 		    &ln, &of, start && spos == 0 ? pos : 0);
286 
287 		/* Process options. */
288 
289 		if (line_result & ROFF_APPEND)
290 			assert(line_result == (ROFF_IGN | ROFF_APPEND));
291 
292 		if (line_result & ROFF_USERCALL)
293 			assert((line_result & ROFF_MASK) == ROFF_REPARSE);
294 
295 		if (line_result & ROFF_USERRET) {
296 			assert(line_result == (ROFF_IGN | ROFF_USERRET));
297 			if (start == 0) {
298 				/* Return from the current macro. */
299 				result = ROFF_USERRET;
300 				goto out;
301 			}
302 		}
303 
304 		switch (line_result & ROFF_LOOPMASK) {
305 		case ROFF_IGN:
306 			break;
307 		case ROFF_WHILE:
308 			if (curp->loop != NULL) {
309 				if (loop == curp->loop)
310 					break;
311 				mandoc_msg(MANDOCERR_WHILE_NEST,
312 				    curp->line, pos, NULL);
313 			}
314 			curp->loop = thisln;
315 			loop = NULL;
316 			inloop = 1;
317 			break;
318 		case ROFF_LOOPCONT:
319 		case ROFF_LOOPEXIT:
320 			if (curp->loop == NULL) {
321 				mandoc_msg(MANDOCERR_WHILE_FAIL,
322 				    curp->line, pos, NULL);
323 				break;
324 			}
325 			if (inloop == 0) {
326 				mandoc_msg(MANDOCERR_WHILE_INTO,
327 				    curp->line, pos, NULL);
328 				curp->loop = loop = NULL;
329 				break;
330 			}
331 			if (line_result & ROFF_LOOPCONT)
332 				loop = curp->loop;
333 			else {
334 				curp->loop = loop = NULL;
335 				inloop = 0;
336 			}
337 			break;
338 		default:
339 			abort();
340 		}
341 
342 		/* Process the main instruction from the roff parser. */
343 
344 		switch (line_result & ROFF_MASK) {
345 		case ROFF_IGN:
346 			break;
347 		case ROFF_CONT:
348 			if (curp->man->meta.macroset == MACROSET_NONE)
349 				choose_parser(curp);
350 			if ((curp->man->meta.macroset == MACROSET_MDOC ?
351 			     mdoc_parseln(curp->man, curp->line, ln.buf, of) :
352 			     man_parseln(curp->man, curp->line, ln.buf, of)
353 			    ) == 2)
354 				goto out;
355 			break;
356 		case ROFF_RERUN:
357 			goto rerun;
358 		case ROFF_REPARSE:
359 			if (++curp->reparse_count > REPARSE_LIMIT) {
360 				/* Abort and return to the top level. */
361 				result = ROFF_IGN;
362 				mandoc_msg(MANDOCERR_ROFFLOOP,
363 				    curp->line, pos, NULL);
364 				goto out;
365 			}
366 			result = mparse_buf_r(curp, ln, of, 0);
367 			if (line_result & ROFF_USERCALL) {
368 				roff_userret(curp->roff);
369 				/* Continue normally. */
370 				if (result & ROFF_USERRET)
371 					result = ROFF_CONT;
372 			}
373 			if (start == 0 && result != ROFF_CONT)
374 				goto out;
375 			break;
376 		case ROFF_SO:
377 			if ( ! (curp->options & MPARSE_SO) &&
378 			    (i >= blk.sz || blk.buf[i] == '\0')) {
379 				curp->man->meta.sodest =
380 				    mandoc_strdup(ln.buf + of);
381 				goto out;
382 			}
383 			if ((fd = mparse_open(curp, ln.buf + of)) != -1) {
384 				mparse_readfd(curp, fd, ln.buf + of);
385 				close(fd);
386 			} else {
387 				mandoc_msg(MANDOCERR_SO_FAIL,
388 				    curp->line, of, ".so %s: %s",
389 				    ln.buf + of, strerror(errno));
390 				ln.sz = mandoc_asprintf(&cp,
391 				    ".sp\nSee the file %s.\n.sp",
392 				    ln.buf + of);
393 				free(ln.buf);
394 				ln.buf = cp;
395 				of = 0;
396 				mparse_buf_r(curp, ln, of, 0);
397 			}
398 			break;
399 		default:
400 			abort();
401 		}
402 
403 		/* Start the next input line. */
404 
405 		if (loop != NULL &&
406 		    (line_result & ROFF_LOOPMASK) == ROFF_IGN)
407 			loop = loop->next;
408 
409 		if (loop != NULL) {
410 			if ((line_result & ROFF_APPEND) == 0)
411 				*ln.buf = '\0';
412 			if (ln.sz < loop->sz)
413 				resize_buf(&ln, loop->sz);
414 			(void)strlcat(ln.buf, loop->buf, ln.sz);
415 			of = 0;
416 			goto rerun;
417 		}
418 
419 		pos = (line_result & ROFF_APPEND) ? strlen(ln.buf) : 0;
420 	}
421 out:
422 	if (inloop) {
423 		if (result != ROFF_USERRET)
424 			mandoc_msg(MANDOCERR_WHILE_OUTOF,
425 			    curp->line, pos, NULL);
426 		curp->loop = NULL;
427 	}
428 	free(ln.buf);
429 	if (firstln != curp->secondary)
430 		free_buf_list(firstln);
431 	return result;
432 }
433 
434 static int
435 read_whole_file(struct mparse *curp, int fd, struct buf *fb, int *with_mmap)
436 {
437 	struct stat	 st;
438 	gzFile		 gz;
439 	size_t		 off;
440 	ssize_t		 ssz;
441 	int		 gzerrnum, retval;
442 
443 	if (fstat(fd, &st) == -1) {
444 		mandoc_msg(MANDOCERR_FSTAT, 0, 0, "%s", strerror(errno));
445 		return -1;
446 	}
447 
448 	/*
449 	 * If we're a regular file, try just reading in the whole entry
450 	 * via mmap().  This is faster than reading it into blocks, and
451 	 * since each file is only a few bytes to begin with, I'm not
452 	 * concerned that this is going to tank any machines.
453 	 */
454 
455 	if (curp->gzip == 0 && S_ISREG(st.st_mode)) {
456 		if (st.st_size > 0x7fffffff) {
457 			mandoc_msg(MANDOCERR_TOOLARGE, 0, 0, NULL);
458 			return -1;
459 		}
460 		*with_mmap = 1;
461 		fb->sz = (size_t)st.st_size;
462 		fb->buf = mmap(NULL, fb->sz, PROT_READ, MAP_SHARED, fd, 0);
463 		if (fb->buf != MAP_FAILED)
464 			return 0;
465 	}
466 
467 	if (curp->gzip) {
468 		/*
469 		 * Duplicating the file descriptor is required
470 		 * because we will have to call gzclose(3)
471 		 * to free memory used internally by zlib,
472 		 * but that will also close the file descriptor,
473 		 * which this function must not do.
474 		 */
475 		if ((fd = dup(fd)) == -1) {
476 			mandoc_msg(MANDOCERR_DUP, 0, 0,
477 			    "%s", strerror(errno));
478 			return -1;
479 		}
480 		if ((gz = gzdopen(fd, "rb")) == NULL) {
481 			mandoc_msg(MANDOCERR_GZDOPEN, 0, 0,
482 			    "%s", strerror(errno));
483 			close(fd);
484 			return -1;
485 		}
486 	} else
487 		gz = NULL;
488 
489 	/*
490 	 * If this isn't a regular file (like, say, stdin), then we must
491 	 * go the old way and just read things in bit by bit.
492 	 */
493 
494 	*with_mmap = 0;
495 	off = 0;
496 	retval = -1;
497 	fb->sz = 0;
498 	fb->buf = NULL;
499 	for (;;) {
500 		if (off == fb->sz) {
501 			if (fb->sz == (1U << 31)) {
502 				mandoc_msg(MANDOCERR_TOOLARGE, 0, 0, NULL);
503 				break;
504 			}
505 			resize_buf(fb, 65536);
506 		}
507 		ssz = curp->gzip ?
508 		    gzread(gz, fb->buf + (int)off, fb->sz - off) :
509 		    read(fd, fb->buf + (int)off, fb->sz - off);
510 		if (ssz == 0) {
511 			fb->sz = off;
512 			retval = 0;
513 			break;
514 		}
515 		if (ssz == -1) {
516 			if (curp->gzip)
517 				(void)gzerror(gz, &gzerrnum);
518 			mandoc_msg(MANDOCERR_READ, 0, 0, "%s",
519 			    curp->gzip && gzerrnum != Z_ERRNO ?
520 			    zError(gzerrnum) : strerror(errno));
521 			break;
522 		}
523 		off += (size_t)ssz;
524 	}
525 
526 	if (curp->gzip && (gzerrnum = gzclose(gz)) != Z_OK)
527 		mandoc_msg(MANDOCERR_GZCLOSE, 0, 0, "%s",
528 		    gzerrnum == Z_ERRNO ? strerror(errno) :
529 		    zError(gzerrnum));
530 	if (retval == -1) {
531 		free(fb->buf);
532 		fb->buf = NULL;
533 	}
534 	return retval;
535 }
536 
537 static void
538 mparse_end(struct mparse *curp)
539 {
540 	if (curp->man->meta.macroset == MACROSET_NONE)
541 		curp->man->meta.macroset = MACROSET_MAN;
542 	if (curp->man->meta.macroset == MACROSET_MDOC)
543 		mdoc_endparse(curp->man);
544 	else
545 		man_endparse(curp->man);
546 	roff_endparse(curp->roff);
547 }
548 
549 /*
550  * Read the whole file into memory and call the parsers.
551  * Called recursively when an .so request is encountered.
552  */
553 void
554 mparse_readfd(struct mparse *curp, int fd, const char *filename)
555 {
556 	static int	 recursion_depth;
557 
558 	struct buf	 blk;
559 	struct buf	*save_primary;
560 	const char	*save_filename, *cp;
561 	size_t		 offset;
562 	int		 save_filenc, save_lineno;
563 	int		 with_mmap;
564 
565 	if (recursion_depth > 64) {
566 		mandoc_msg(MANDOCERR_ROFFLOOP, curp->line, 0, NULL);
567 		return;
568 	} else if (recursion_depth == 0 &&
569 	    (cp = strrchr(filename, '.')) != NULL &&
570             cp[1] >= '1' && cp[1] <= '9')
571                 curp->man->filesec = cp[1];
572         else
573                 curp->man->filesec = '\0';
574 
575 	if (read_whole_file(curp, fd, &blk, &with_mmap) == -1)
576 		return;
577 
578 	/*
579 	 * Save some properties of the parent file.
580 	 */
581 
582 	save_primary = curp->primary;
583 	save_filenc = curp->filenc;
584 	save_lineno = curp->line;
585 	save_filename = mandoc_msg_getinfilename();
586 
587 	curp->primary = &blk;
588 	curp->filenc = curp->options & (MPARSE_UTF8 | MPARSE_LATIN1);
589 	curp->line = 1;
590 	mandoc_msg_setinfilename(filename);
591 
592 	/* Skip an UTF-8 byte order mark. */
593 	if (curp->filenc & MPARSE_UTF8 && blk.sz > 2 &&
594 	    (unsigned char)blk.buf[0] == 0xef &&
595 	    (unsigned char)blk.buf[1] == 0xbb &&
596 	    (unsigned char)blk.buf[2] == 0xbf) {
597 		offset = 3;
598 		curp->filenc &= ~MPARSE_LATIN1;
599 	} else
600 		offset = 0;
601 
602 	recursion_depth++;
603 	mparse_buf_r(curp, blk, offset, 1);
604 	if (--recursion_depth == 0)
605 		mparse_end(curp);
606 
607 	/*
608 	 * Clean up and restore saved parent properties.
609 	 */
610 
611 	if (with_mmap)
612 		munmap(blk.buf, blk.sz);
613 	else
614 		free(blk.buf);
615 
616 	curp->primary = save_primary;
617 	curp->filenc = save_filenc;
618 	curp->line = save_lineno;
619 	if (save_filename != NULL)
620 		mandoc_msg_setinfilename(save_filename);
621 }
622 
623 int
624 mparse_open(struct mparse *curp, const char *file)
625 {
626 	char		 *cp;
627 	int		  fd, save_errno;
628 
629 	cp = strrchr(file, '.');
630 	curp->gzip = (cp != NULL && ! strcmp(cp + 1, "gz"));
631 
632 	/* First try to use the filename as it is. */
633 
634 	if ((fd = open(file, O_RDONLY)) != -1)
635 		return fd;
636 
637 	/*
638 	 * If that doesn't work and the filename doesn't
639 	 * already  end in .gz, try appending .gz.
640 	 */
641 
642 	if ( ! curp->gzip) {
643 		save_errno = errno;
644 		mandoc_asprintf(&cp, "%s.gz", file);
645 		fd = open(cp, O_RDONLY);
646 		free(cp);
647 		errno = save_errno;
648 		if (fd != -1) {
649 			curp->gzip = 1;
650 			return fd;
651 		}
652 	}
653 
654 	/* Neither worked, give up. */
655 
656 	return -1;
657 }
658 
659 struct mparse *
660 mparse_alloc(int options, enum mandoc_os os_e, const char *os_s)
661 {
662 	struct mparse	*curp;
663 
664 	curp = mandoc_calloc(1, sizeof(struct mparse));
665 
666 	curp->options = options;
667 	curp->os_s = os_s;
668 
669 	curp->roff = roff_alloc(options);
670 	curp->man = roff_man_alloc(curp->roff, curp->os_s,
671 		curp->options & MPARSE_QUICK ? 1 : 0);
672 	if (curp->options & MPARSE_MDOC) {
673 		curp->man->meta.macroset = MACROSET_MDOC;
674 		if (curp->man->mdocmac == NULL)
675 			curp->man->mdocmac = roffhash_alloc(MDOC_Dd, MDOC_MAX);
676 	} else if (curp->options & MPARSE_MAN) {
677 		curp->man->meta.macroset = MACROSET_MAN;
678 		if (curp->man->manmac == NULL)
679 			curp->man->manmac = roffhash_alloc(MAN_TH, MAN_MAX);
680 	}
681 	curp->man->meta.first->tok = TOKEN_NONE;
682 	curp->man->meta.os_e = os_e;
683 	tag_alloc();
684 	return curp;
685 }
686 
687 void
688 mparse_reset(struct mparse *curp)
689 {
690 	tag_free();
691 	roff_reset(curp->roff);
692 	roff_man_reset(curp->man);
693 	free_buf_list(curp->secondary);
694 	curp->secondary = NULL;
695 	curp->gzip = 0;
696 	tag_alloc();
697 }
698 
699 void
700 mparse_free(struct mparse *curp)
701 {
702 	tag_free();
703 	roffhash_free(curp->man->mdocmac);
704 	roffhash_free(curp->man->manmac);
705 	roff_man_free(curp->man);
706 	roff_free(curp->roff);
707 	free_buf_list(curp->secondary);
708 	free(curp);
709 }
710 
711 struct roff_meta *
712 mparse_result(struct mparse *curp)
713 {
714 	roff_state_reset(curp->man);
715 	if (curp->options & MPARSE_VALIDATE) {
716 		if (curp->man->meta.macroset == MACROSET_MDOC)
717 			mdoc_validate(curp->man);
718 		else
719 			man_validate(curp->man);
720 		tag_postprocess(curp->man, curp->man->meta.first);
721 	}
722 	return &curp->man->meta;
723 }
724 
725 void
726 mparse_copy(const struct mparse *p)
727 {
728 	struct buf	*buf;
729 
730 	for (buf = p->secondary; buf != NULL; buf = buf->next)
731 		puts(buf->buf);
732 }
733