read.c revision 1.5 
1/*	$Vendor-Id: read.c,v 1.27 2012/02/05 16:46:15 joerg 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
47struct	buf {
48	char	 	 *buf; /* binary input buffer */
49	size_t		  sz; /* size of binary buffer */
50};
51
52struct	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
69static	void	  resize_buf(struct buf *, size_t);
70static	void	  mparse_buf_r(struct mparse *, struct buf, int);
71static	void	  mparse_readfd_r(struct mparse *, int, const char *, int);
72static	void	  pset(const char *, int, struct mparse *);
73static	void	  pdesc(struct mparse *, const char *, int);
74static	int	  read_whole_file(const char *, int, struct buf *, int *);
75static	void	  mparse_end(struct mparse *);
76
77static	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
87static	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	"argument count wrong, violates syntax",
196	"child violates parent syntax",
197	"argument count wrong, violates syntax",
198	"NOT IMPLEMENTED: .so with absolute path or \"..\"",
199	"no document body",
200	"no document prologue",
201	"static buffer exhausted",
202};
203
204static	const char * const	mandoclevels[MANDOCLEVEL_MAX] = {
205	"SUCCESS",
206	"RESERVED",
207	"WARNING",
208	"ERROR",
209	"FATAL",
210	"BADARG",
211	"SYSERR"
212};
213
214static void
215resize_buf(struct buf *buf, size_t initial)
216{
217
218	buf->sz = buf->sz > initial/2 ? 2 * buf->sz : initial;
219	buf->buf = mandoc_realloc(buf->buf, buf->sz);
220}
221
222static void
223pset(const char *buf, int pos, struct mparse *curp)
224{
225	int		 i;
226
227	/*
228	 * Try to intuit which kind of manual parser should be used.  If
229	 * passed in by command-line (-man, -mdoc), then use that
230	 * explicitly.  If passed as -mandoc, then try to guess from the
231	 * line: either skip dot-lines, use -mdoc when finding `.Dt', or
232	 * default to -man, which is more lenient.
233	 *
234	 * Separate out pmdoc/pman from mdoc/man: the first persists
235	 * through all parsers, while the latter is used per-parse.
236	 */
237
238	if ('.' == buf[0] || '\'' == buf[0]) {
239		for (i = 1; buf[i]; i++)
240			if (' ' != buf[i] && '\t' != buf[i])
241				break;
242		if ('\0' == buf[i])
243			return;
244	}
245
246	switch (curp->inttype) {
247	case (MPARSE_MDOC):
248		if (NULL == curp->pmdoc)
249			curp->pmdoc = mdoc_alloc(curp->roff, curp);
250		assert(curp->pmdoc);
251		curp->mdoc = curp->pmdoc;
252		return;
253	case (MPARSE_MAN):
254		if (NULL == curp->pman)
255			curp->pman = man_alloc(curp->roff, curp);
256		assert(curp->pman);
257		curp->man = curp->pman;
258		return;
259	default:
260		break;
261	}
262
263	if (pos >= 3 && 0 == memcmp(buf, ".Dd", 3))  {
264		if (NULL == curp->pmdoc)
265			curp->pmdoc = mdoc_alloc(curp->roff, curp);
266		assert(curp->pmdoc);
267		curp->mdoc = curp->pmdoc;
268		return;
269	}
270
271	if (NULL == curp->pman)
272		curp->pman = man_alloc(curp->roff, curp);
273	assert(curp->pman);
274	curp->man = curp->pman;
275}
276
277/*
278 * Main parse routine for an opened file.  This is called for each
279 * opened file and simply loops around the full input file, possibly
280 * nesting (i.e., with `so').
281 */
282static void
283mparse_buf_r(struct mparse *curp, struct buf blk, int start)
284{
285	const struct tbl_span	*span;
286	struct buf	 ln;
287	enum rofferr	 rr;
288	int		 i, of, rc;
289	int		 pos; /* byte number in the ln buffer */
290	int		 lnn; /* line number in the real file */
291	unsigned char	 c;
292
293	memset(&ln, 0, sizeof(struct buf));
294
295	lnn = curp->line;
296	pos = 0;
297
298	for (i = 0; i < (int)blk.sz; ) {
299		if (0 == pos && '\0' == blk.buf[i])
300			break;
301
302		if (start) {
303			curp->line = lnn;
304			curp->reparse_count = 0;
305		}
306
307		while (i < (int)blk.sz && (start || '\0' != blk.buf[i])) {
308
309			/*
310			 * When finding an unescaped newline character,
311			 * leave the character loop to process the line.
312			 * Skip a preceding carriage return, if any.
313			 */
314
315			if ('\r' == blk.buf[i] && i + 1 < (int)blk.sz &&
316			    '\n' == blk.buf[i + 1])
317				++i;
318			if ('\n' == blk.buf[i]) {
319				++i;
320				++lnn;
321				break;
322			}
323
324			/*
325			 * Warn about bogus characters.  If you're using
326			 * non-ASCII encoding, you're screwing your
327			 * readers.  Since I'd rather this not happen,
328			 * I'll be helpful and replace these characters
329			 * with "?", so we don't display gibberish.
330			 * Note to manual writers: use special characters.
331			 */
332
333			c = (unsigned char) blk.buf[i];
334
335			if ( ! (isascii(c) &&
336					(isgraph(c) || isblank(c)))) {
337				mandoc_msg(MANDOCERR_BADCHAR, curp,
338						curp->line, pos, NULL);
339				i++;
340				if (pos >= (int)ln.sz)
341					resize_buf(&ln, 256);
342				ln.buf[pos++] = '?';
343				continue;
344			}
345
346			/* Trailing backslash = a plain char. */
347
348			if ('\\' != blk.buf[i] || i + 1 == (int)blk.sz) {
349				if (pos >= (int)ln.sz)
350					resize_buf(&ln, 256);
351				ln.buf[pos++] = blk.buf[i++];
352				continue;
353			}
354
355			/*
356			 * Found escape and at least one other character.
357			 * When it's a newline character, skip it.
358			 * When there is a carriage return in between,
359			 * skip that one as well.
360			 */
361
362			if ('\r' == blk.buf[i + 1] && i + 2 < (int)blk.sz &&
363			    '\n' == blk.buf[i + 2])
364				++i;
365			if ('\n' == blk.buf[i + 1]) {
366				i += 2;
367				++lnn;
368				continue;
369			}
370
371			if ('"' == blk.buf[i + 1] || '#' == blk.buf[i + 1]) {
372				i += 2;
373				/* Comment, skip to end of line */
374				for (; i < (int)blk.sz; ++i) {
375					if ('\n' == blk.buf[i]) {
376						++i;
377						++lnn;
378						break;
379					}
380				}
381
382				/* Backout trailing whitespaces */
383				for (; pos > 0; --pos) {
384					if (ln.buf[pos - 1] != ' ')
385						break;
386					if (pos > 2 && ln.buf[pos - 2] == '\\')
387						break;
388				}
389				break;
390			}
391
392			/* Some other escape sequence, copy & cont. */
393
394			if (pos + 1 >= (int)ln.sz)
395				resize_buf(&ln, 256);
396
397			ln.buf[pos++] = blk.buf[i++];
398			ln.buf[pos++] = blk.buf[i++];
399		}
400
401 		if (pos >= (int)ln.sz)
402			resize_buf(&ln, 256);
403
404		ln.buf[pos] = '\0';
405
406		/*
407		 * A significant amount of complexity is contained by
408		 * the roff preprocessor.  It's line-oriented but can be
409		 * expressed on one line, so we need at times to
410		 * readjust our starting point and re-run it.  The roff
411		 * preprocessor can also readjust the buffers with new
412		 * data, so we pass them in wholesale.
413		 */
414
415		of = 0;
416
417		/*
418		 * Maintain a lookaside buffer of all parsed lines.  We
419		 * only do this if mparse_keep() has been invoked (the
420		 * buffer may be accessed with mparse_getkeep()).
421		 */
422
423		if (curp->secondary) {
424			curp->secondary->buf =
425				mandoc_realloc
426				(curp->secondary->buf,
427				 curp->secondary->sz + pos + 2);
428			memcpy(curp->secondary->buf +
429					curp->secondary->sz,
430					ln.buf, pos);
431			curp->secondary->sz += pos;
432			curp->secondary->buf
433				[curp->secondary->sz] = '\n';
434			curp->secondary->sz++;
435			curp->secondary->buf
436				[curp->secondary->sz] = '\0';
437		}
438rerun:
439		rr = roff_parseln
440			(curp->roff, curp->line,
441			 &ln.buf, &ln.sz, of, &of);
442
443		switch (rr) {
444		case (ROFF_REPARSE):
445			if (REPARSE_LIMIT >= ++curp->reparse_count)
446				mparse_buf_r(curp, ln, 0);
447			else
448				mandoc_msg(MANDOCERR_ROFFLOOP, curp,
449					curp->line, pos, NULL);
450			pos = 0;
451			continue;
452		case (ROFF_APPEND):
453			pos = (int)strlen(ln.buf);
454			continue;
455		case (ROFF_RERUN):
456			goto rerun;
457		case (ROFF_IGN):
458			pos = 0;
459			continue;
460		case (ROFF_ERR):
461			assert(MANDOCLEVEL_FATAL <= curp->file_status);
462			break;
463		case (ROFF_SO):
464			/*
465			 * We remove `so' clauses from our lookaside
466			 * buffer because we're going to descend into
467			 * the file recursively.
468			 */
469			if (curp->secondary)
470				curp->secondary->sz -= pos + 1;
471			mparse_readfd_r(curp, -1, ln.buf + of, 1);
472			if (MANDOCLEVEL_FATAL <= curp->file_status)
473				break;
474			pos = 0;
475			continue;
476		default:
477			break;
478		}
479
480		/*
481		 * If we encounter errors in the recursive parse, make
482		 * sure we don't continue parsing.
483		 */
484
485		if (MANDOCLEVEL_FATAL <= curp->file_status)
486			break;
487
488		/*
489		 * If input parsers have not been allocated, do so now.
490		 * We keep these instanced between parsers, but set them
491		 * locally per parse routine since we can use different
492		 * parsers with each one.
493		 */
494
495		if ( ! (curp->man || curp->mdoc))
496			pset(ln.buf + of, pos - of, curp);
497
498		/*
499		 * Lastly, push down into the parsers themselves.  One
500		 * of these will have already been set in the pset()
501		 * routine.
502		 * If libroff returns ROFF_TBL, then add it to the
503		 * currently open parse.  Since we only get here if
504		 * there does exist data (see tbl_data.c), we're
505		 * guaranteed that something's been allocated.
506		 * Do the same for ROFF_EQN.
507		 */
508
509		rc = -1;
510
511		if (ROFF_TBL == rr)
512			while (NULL != (span = roff_span(curp->roff))) {
513				rc = curp->man ?
514					man_addspan(curp->man, span) :
515					mdoc_addspan(curp->mdoc, span);
516				if (0 == rc)
517					break;
518			}
519		else if (ROFF_EQN == rr)
520			rc = curp->mdoc ?
521				mdoc_addeqn(curp->mdoc,
522					roff_eqn(curp->roff)) :
523				man_addeqn(curp->man,
524					roff_eqn(curp->roff));
525		else if (curp->man || curp->mdoc)
526			rc = curp->man ?
527				man_parseln(curp->man,
528					curp->line, ln.buf, of) :
529				mdoc_parseln(curp->mdoc,
530					curp->line, ln.buf, of);
531
532		if (0 == rc) {
533			assert(MANDOCLEVEL_FATAL <= curp->file_status);
534			break;
535		}
536
537		/* Temporary buffers typically are not full. */
538
539		if (0 == start && '\0' == blk.buf[i])
540			break;
541
542		/* Start the next input line. */
543
544		pos = 0;
545	}
546
547	free(ln.buf);
548}
549
550static void
551pdesc(struct mparse *curp, const char *file, int fd)
552{
553	struct buf	 blk;
554	int		 with_mmap;
555
556	/*
557	 * Run for each opened file; may be called more than once for
558	 * each full parse sequence if the opened file is nested (i.e.,
559	 * from `so').  Simply sucks in the whole file and moves into
560	 * the parse phase for the file.
561	 */
562
563	if ( ! read_whole_file(file, fd, &blk, &with_mmap)) {
564		curp->file_status = MANDOCLEVEL_SYSERR;
565		return;
566	}
567
568	/* Line number is per-file. */
569
570	curp->line = 1;
571
572	mparse_buf_r(curp, blk, 1);
573
574#ifdef	HAVE_MMAP
575	if (with_mmap)
576		munmap(blk.buf, blk.sz);
577	else
578#endif
579		free(blk.buf);
580}
581
582static int
583read_whole_file(const char *file, int fd, struct buf *fb, int *with_mmap)
584{
585	size_t		 off;
586	ssize_t		 ssz;
587
588#ifdef	HAVE_MMAP
589	struct stat	 st;
590	if (-1 == fstat(fd, &st)) {
591		perror(file);
592		return(0);
593	}
594
595	/*
596	 * If we're a regular file, try just reading in the whole entry
597	 * via mmap().  This is faster than reading it into blocks, and
598	 * since each file is only a few bytes to begin with, I'm not
599	 * concerned that this is going to tank any machines.
600	 */
601
602	if (S_ISREG(st.st_mode)) {
603		if (st.st_size >= (1U << 31)) {
604			fprintf(stderr, "%s: input too large\n", file);
605			return(0);
606		}
607		*with_mmap = 1;
608		fb->sz = (size_t)st.st_size;
609		fb->buf = mmap(NULL, fb->sz, PROT_READ,
610				MAP_FILE|MAP_SHARED, fd, 0);
611		if (fb->buf != MAP_FAILED)
612			return(1);
613	}
614#endif
615
616	/*
617	 * If this isn't a regular file (like, say, stdin), then we must
618	 * go the old way and just read things in bit by bit.
619	 */
620
621	*with_mmap = 0;
622	off = 0;
623	fb->sz = 0;
624	fb->buf = NULL;
625	for (;;) {
626		if (off == fb->sz) {
627			if (fb->sz == (1U << 31)) {
628				fprintf(stderr, "%s: input too large\n", file);
629				break;
630			}
631			resize_buf(fb, 65536);
632		}
633		ssz = read(fd, fb->buf + (int)off, fb->sz - off);
634		if (ssz == 0) {
635			fb->sz = off;
636			return(1);
637		}
638		if (ssz == -1) {
639			perror(file);
640			break;
641		}
642		off += (size_t)ssz;
643	}
644
645	free(fb->buf);
646	fb->buf = NULL;
647	return(0);
648}
649
650static void
651mparse_end(struct mparse *curp)
652{
653
654	if (MANDOCLEVEL_FATAL <= curp->file_status)
655		return;
656
657	if (curp->mdoc && ! mdoc_endparse(curp->mdoc)) {
658		assert(MANDOCLEVEL_FATAL <= curp->file_status);
659		return;
660	}
661
662	if (curp->man && ! man_endparse(curp->man)) {
663		assert(MANDOCLEVEL_FATAL <= curp->file_status);
664		return;
665	}
666
667	if ( ! (curp->man || curp->mdoc)) {
668		mandoc_msg(MANDOCERR_NOTMANUAL, curp, 1, 0, NULL);
669		curp->file_status = MANDOCLEVEL_FATAL;
670		return;
671	}
672
673	roff_endparse(curp->roff);
674}
675
676static void
677mparse_readfd_r(struct mparse *curp, int fd, const char *file, int re)
678{
679	const char	*svfile;
680
681	if (-1 == fd)
682		if (-1 == (fd = open(file, O_RDONLY, 0))) {
683			perror(file);
684			curp->file_status = MANDOCLEVEL_SYSERR;
685			return;
686		}
687
688	svfile = curp->file;
689	curp->file = file;
690
691	pdesc(curp, file, fd);
692
693	if (0 == re && MANDOCLEVEL_FATAL > curp->file_status)
694		mparse_end(curp);
695
696	if (STDIN_FILENO != fd && -1 == close(fd))
697		perror(file);
698
699	curp->file = svfile;
700}
701
702enum mandoclevel
703mparse_readfd(struct mparse *curp, int fd, const char *file)
704{
705
706	mparse_readfd_r(curp, fd, file, 0);
707	return(curp->file_status);
708}
709
710struct mparse *
711mparse_alloc(enum mparset inttype, enum mandoclevel wlevel, mandocmsg mmsg, void *arg)
712{
713	struct mparse	*curp;
714
715	assert(wlevel <= MANDOCLEVEL_FATAL);
716
717	curp = mandoc_calloc(1, sizeof(struct mparse));
718
719	curp->wlevel = wlevel;
720	curp->mmsg = mmsg;
721	curp->arg = arg;
722	curp->inttype = inttype;
723
724	curp->roff = roff_alloc(curp);
725	return(curp);
726}
727
728void
729mparse_reset(struct mparse *curp)
730{
731
732	roff_reset(curp->roff);
733
734	if (curp->mdoc)
735		mdoc_reset(curp->mdoc);
736	if (curp->man)
737		man_reset(curp->man);
738	if (curp->secondary)
739		curp->secondary->sz = 0;
740
741	curp->file_status = MANDOCLEVEL_OK;
742	curp->mdoc = NULL;
743	curp->man = NULL;
744}
745
746void
747mparse_free(struct mparse *curp)
748{
749
750	if (curp->pmdoc)
751		mdoc_free(curp->pmdoc);
752	if (curp->pman)
753		man_free(curp->pman);
754	if (curp->roff)
755		roff_free(curp->roff);
756	if (curp->secondary)
757		free(curp->secondary->buf);
758
759	free(curp->secondary);
760	free(curp);
761}
762
763void
764mparse_result(struct mparse *curp, struct mdoc **mdoc, struct man **man)
765{
766
767	if (mdoc)
768		*mdoc = curp->mdoc;
769	if (man)
770		*man = curp->man;
771}
772
773void
774mandoc_vmsg(enum mandocerr t, struct mparse *m,
775		int ln, int pos, const char *fmt, ...)
776{
777	char		 buf[256];
778	va_list		 ap;
779
780	va_start(ap, fmt);
781	vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
782	va_end(ap);
783
784	mandoc_msg(t, m, ln, pos, buf);
785}
786
787void
788mandoc_msg(enum mandocerr er, struct mparse *m,
789		int ln, int col, const char *msg)
790{
791	enum mandoclevel level;
792
793	level = MANDOCLEVEL_FATAL;
794	while (er < mandoclimits[level])
795		level--;
796
797	if (level < m->wlevel)
798		return;
799
800	if (m->mmsg)
801		(*m->mmsg)(er, level, m->file, ln, col, msg);
802
803	if (m->file_status < level)
804		m->file_status = level;
805}
806
807const char *
808mparse_strerror(enum mandocerr er)
809{
810
811	return(mandocerrs[er]);
812}
813
814const char *
815mparse_strlevel(enum mandoclevel lvl)
816{
817	return(mandoclevels[lvl]);
818}
819
820void
821mparse_keep(struct mparse *p)
822{
823
824	assert(NULL == p->secondary);
825	p->secondary = mandoc_calloc(1, sizeof(struct buf));
826}
827
828const char *
829mparse_getkeep(const struct mparse *p)
830{
831
832	assert(p->secondary);
833	return(p->secondary->sz ? p->secondary->buf : NULL);
834}
835