xref: /openbsd-src/usr.bin/mandoc/mdoc_validate.c (revision a28daedfc357b214be5c701aa8ba8adb29a7f1c2)
1 /* $Id: mdoc_validate.c,v 1.1 2009/04/06 20:30:40 kristaps Exp $ */
2 /*
3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the
7  * above copyright notice and this permission notice appear in all
8  * copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
11  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
12  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
13  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
14  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
15  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
16  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17  * PERFORMANCE OF THIS SOFTWARE.
18  */
19 #include <sys/types.h>
20 
21 #include <assert.h>
22 #include <ctype.h>
23 #include <stdarg.h>
24 #include <stdlib.h>
25 #include <string.h>
26 
27 #include "libmdoc.h"
28 
29 /* FIXME: .Bl -diag can't have non-text children in HEAD. */
30 /* TODO: ignoring Pp (it's superfluous in some invocations). */
31 
32 #define	PRE_ARGS	struct mdoc *mdoc, const struct mdoc_node *n
33 #define	POST_ARGS	struct mdoc *mdoc
34 
35 enum	merr {
36 	ETOOLONG,
37 	EESCAPE,
38 	EPRINT,
39 	ENODATA,
40 	ENOPROLOGUE,
41 	ELINE,
42 	EATT,
43 	ENAME,
44 	ELISTTYPE,
45 	EDISPTYPE,
46 	EMULTIDISP,
47 	EMULTILIST,
48 	EARGREP,
49 	EBOOL,
50 	ENESTDISP
51 };
52 
53 enum	mwarn {
54 	WPRINT,
55 	WESCAPE,
56 	WWRONGMSEC,
57 	WSECOOO,
58 	WSECREP,
59 	WBADSTAND,
60 	WNAMESECINC,
61 	WNOMULTILINE,
62 	WMULTILINE,
63 	WLINE,
64 	WNOLINE,
65 	WPROLOOO,
66 	WPROLREP,
67 	WARGVAL,
68 	WBADSEC,
69 	WBADMSEC
70 };
71 
72 typedef	int	(*v_pre)(PRE_ARGS);
73 typedef	int	(*v_post)(POST_ARGS);
74 
75 struct	valids {
76 	v_pre	*pre;
77 	v_post	*post;
78 };
79 
80 static	int	pwarn(struct mdoc *, int, int, enum mwarn);
81 static	int	perr(struct mdoc *, int, int, enum merr);
82 static	int	printwarn(struct mdoc *, int, int);
83 static	int	check_parent(PRE_ARGS, int, enum mdoc_type);
84 static	int	check_msec(PRE_ARGS, ...);
85 static	int	check_sec(PRE_ARGS, ...);
86 static	int	check_stdarg(PRE_ARGS);
87 static	int	check_text(struct mdoc *, int, int, const char *);
88 static	int	check_argv(struct mdoc *,
89 			const struct mdoc_node *,
90 			const struct mdoc_argv *);
91 static	int	check_args(struct mdoc *,
92 			const struct mdoc_node *);
93 static	int	err_child_lt(struct mdoc *, const char *, int);
94 static	int	warn_child_lt(struct mdoc *, const char *, int);
95 static	int	err_child_gt(struct mdoc *, const char *, int);
96 static	int	warn_child_gt(struct mdoc *, const char *, int);
97 static	int	err_child_eq(struct mdoc *, const char *, int);
98 static	int	warn_child_eq(struct mdoc *, const char *, int);
99 static	int	count_child(struct mdoc *);
100 static	int	warn_count(struct mdoc *, const char *,
101 			int, const char *, int);
102 static	int	err_count(struct mdoc *, const char *,
103 			int, const char *, int);
104 static	int	pre_an(PRE_ARGS);
105 static	int	pre_bd(PRE_ARGS);
106 static	int	pre_bl(PRE_ARGS);
107 static	int	pre_cd(PRE_ARGS);
108 static	int	pre_dd(PRE_ARGS);
109 static	int	pre_display(PRE_ARGS);
110 static	int	pre_dt(PRE_ARGS);
111 static	int	pre_er(PRE_ARGS);
112 static	int	pre_ex(PRE_ARGS);
113 static	int	pre_fd(PRE_ARGS);
114 static	int	pre_it(PRE_ARGS);
115 static	int	pre_lb(PRE_ARGS);
116 static	int	pre_os(PRE_ARGS);
117 static	int	pre_prologue(PRE_ARGS);
118 static	int	pre_rv(PRE_ARGS);
119 static	int	pre_sh(PRE_ARGS);
120 static	int	pre_ss(PRE_ARGS);
121 static	int	herr_ge1(POST_ARGS);
122 static	int	hwarn_le1(POST_ARGS);
123 static	int	herr_eq0(POST_ARGS);
124 static	int	eerr_eq0(POST_ARGS);
125 static	int	eerr_le2(POST_ARGS);
126 static	int	eerr_eq1(POST_ARGS);
127 static	int	eerr_ge1(POST_ARGS);
128 static	int	ewarn_eq0(POST_ARGS);
129 static	int	ewarn_eq1(POST_ARGS);
130 static	int	bwarn_ge1(POST_ARGS);
131 static	int	hwarn_eq1(POST_ARGS);
132 static	int	ewarn_ge1(POST_ARGS);
133 static	int	ebool(POST_ARGS);
134 static	int	post_an(POST_ARGS);
135 static	int	post_args(POST_ARGS);
136 static	int	post_at(POST_ARGS);
137 static	int	post_bf(POST_ARGS);
138 static	int	post_bl(POST_ARGS);
139 static	int	post_it(POST_ARGS);
140 static	int	post_nm(POST_ARGS);
141 static	int	post_root(POST_ARGS);
142 static	int	post_sh(POST_ARGS);
143 static	int	post_sh_body(POST_ARGS);
144 static	int	post_sh_head(POST_ARGS);
145 static	int	post_st(POST_ARGS);
146 
147 #define	vwarn(m, t) nwarn((m), (m)->last, (t))
148 #define	verr(m, t) nerr((m), (m)->last, (t))
149 #define	nwarn(m, n, t) pwarn((m), (n)->line, (n)->pos, (t))
150 #define	nerr(m, n, t) perr((m), (n)->line, (n)->pos, (t))
151 
152 static	v_pre	pres_an[] = { pre_an, NULL };
153 static	v_pre	pres_bd[] = { pre_display, pre_bd, NULL };
154 static	v_pre	pres_bl[] = { pre_bl, NULL };
155 static	v_pre	pres_cd[] = { pre_cd, NULL };
156 static	v_pre	pres_dd[] = { pre_prologue, pre_dd, NULL };
157 static	v_pre	pres_d1[] = { pre_display, NULL };
158 static	v_pre	pres_dt[] = { pre_prologue, pre_dt, NULL };
159 static	v_pre	pres_er[] = { pre_er, NULL };
160 static	v_pre	pres_ex[] = { pre_ex, NULL };
161 static	v_pre	pres_fd[] = { pre_fd, NULL };
162 static	v_pre	pres_it[] = { pre_it, NULL };
163 static	v_pre	pres_lb[] = { pre_lb, NULL };
164 static	v_pre	pres_os[] = { pre_prologue, pre_os, NULL };
165 static	v_pre	pres_rv[] = { pre_rv, NULL };
166 static	v_pre	pres_sh[] = { pre_sh, NULL };
167 static	v_pre	pres_ss[] = { pre_ss, NULL };
168 static	v_post	posts_bool[] = { eerr_eq1, ebool, NULL };
169 static	v_post	posts_bd[] = { herr_eq0, bwarn_ge1, NULL };
170 static	v_post	posts_text[] = { eerr_ge1, NULL };
171 static	v_post	posts_wtext[] = { ewarn_ge1, NULL };
172 static	v_post	posts_notext[] = { eerr_eq0, NULL };
173 static	v_post	posts_wline[] = { bwarn_ge1, herr_eq0, NULL };
174 static	v_post	posts_sh[] = { herr_ge1, bwarn_ge1, post_sh, NULL };
175 static	v_post	posts_bl[] = { herr_eq0, bwarn_ge1, post_bl, NULL };
176 static	v_post	posts_it[] = { post_it, NULL };
177 static	v_post	posts_in[] = { ewarn_eq1, NULL };
178 static	v_post	posts_ss[] = { herr_ge1, NULL };
179 static	v_post	posts_pf[] = { eerr_eq1, NULL };
180 static	v_post	posts_lb[] = { eerr_eq1, NULL };
181 static	v_post	posts_st[] = { eerr_eq1, post_st, NULL };
182 static	v_post	posts_pp[] = { ewarn_eq0, NULL };
183 static	v_post	posts_ex[] = { eerr_eq0, post_args, NULL };
184 static	v_post	posts_rv[] = { eerr_eq0, post_args, NULL };
185 static	v_post	posts_an[] = { post_an, NULL };
186 static	v_post	posts_at[] = { post_at, NULL };
187 static	v_post	posts_xr[] = { eerr_ge1, eerr_le2, NULL };
188 static	v_post	posts_nm[] = { post_nm, NULL };
189 static	v_post	posts_bf[] = { hwarn_le1, post_bf, NULL };
190 static	v_post	posts_fo[] = { hwarn_eq1, bwarn_ge1, NULL };
191 
192 const	struct valids mdoc_valids[MDOC_MAX] = {
193 	{ NULL, NULL }, 			/* \" */
194 	{ pres_dd, posts_text },		/* Dd */
195 	{ pres_dt, NULL },			/* Dt */
196 	{ pres_os, NULL },			/* Os */
197 	{ pres_sh, posts_sh },			/* Sh */
198 	{ pres_ss, posts_ss },			/* Ss */
199 	{ NULL, posts_pp },			/* Pp */
200 	{ pres_d1, posts_wline },		/* D1 */
201 	{ pres_d1, posts_wline },		/* Dl */
202 	{ pres_bd, posts_bd },			/* Bd */
203 	{ NULL, NULL },				/* Ed */
204 	{ pres_bl, posts_bl },			/* Bl */
205 	{ NULL, NULL },				/* El */
206 	{ pres_it, posts_it },			/* It */
207 	{ NULL, posts_text },			/* Ad */
208 	{ pres_an, posts_an },			/* An */
209 	{ NULL, NULL },				/* Ar */
210 	{ pres_cd, posts_text },		/* Cd */
211 	{ NULL, NULL },				/* Cm */
212 	{ NULL, NULL },				/* Dv */
213 	{ pres_er, posts_text },		/* Er */
214 	{ NULL, NULL },				/* Ev */
215 	{ pres_ex, posts_ex },			/* Ex */
216 	{ NULL, NULL },				/* Fa */
217 	{ pres_fd, posts_wtext },		/* Fd */
218 	{ NULL, NULL },				/* Fl */
219 	{ NULL, posts_text },			/* Fn */
220 	{ NULL, posts_wtext },			/* Ft */
221 	{ NULL, posts_text },			/* Ic */
222 	{ NULL, posts_in },			/* In */
223 	{ NULL, NULL },				/* Li */
224 	{ NULL, posts_wtext },			/* Nd */
225 	{ NULL, posts_nm },			/* Nm */
226 	{ NULL, posts_wline },			/* Op */
227 	{ NULL, NULL },				/* Ot */
228 	{ NULL, NULL },				/* Pa */
229 	{ pres_rv, posts_rv },			/* Rv */
230 	{ NULL, posts_st },			/* St */
231 	{ NULL, NULL },				/* Va */
232 	{ NULL, posts_text },			/* Vt */
233 	{ NULL, posts_xr },			/* Xr */
234 	{ NULL, posts_text },			/* %A */
235 	{ NULL, posts_text },			/* %B */
236 	{ NULL, posts_text },			/* %D */
237 	{ NULL, posts_text },			/* %I */
238 	{ NULL, posts_text },			/* %J */
239 	{ NULL, posts_text },			/* %N */
240 	{ NULL, posts_text },			/* %O */
241 	{ NULL, posts_text },			/* %P */
242 	{ NULL, posts_text },			/* %R */
243 	{ NULL, posts_text },			/* %T */
244 	{ NULL, posts_text },			/* %V */
245 	{ NULL, NULL },				/* Ac */
246 	{ NULL, NULL },				/* Ao */
247 	{ NULL, posts_wline },			/* Aq */
248 	{ NULL, posts_at },			/* At */
249 	{ NULL, NULL },				/* Bc */
250 	{ NULL, posts_bf },			/* Bf */
251 	{ NULL, NULL },				/* Bo */
252 	{ NULL, posts_wline },			/* Bq */
253 	{ NULL, NULL },				/* Bsx */
254 	{ NULL, NULL },				/* Bx */
255 	{ NULL, posts_bool },			/* Db */
256 	{ NULL, NULL },				/* Dc */
257 	{ NULL, NULL },				/* Do */
258 	{ NULL, posts_wline },			/* Dq */
259 	{ NULL, NULL },				/* Ec */
260 	{ NULL, NULL },				/* Ef */
261 	{ NULL, NULL },				/* Em */
262 	{ NULL, NULL },				/* Eo */
263 	{ NULL, NULL },				/* Fx */
264 	{ NULL, posts_text },			/* Ms */
265 	{ NULL, posts_notext },			/* No */
266 	{ NULL, posts_notext },			/* Ns */
267 	{ NULL, NULL },				/* Nx */
268 	{ NULL, NULL },				/* Ox */
269 	{ NULL, NULL },				/* Pc */
270 	{ NULL, posts_pf },			/* Pf */
271 	{ NULL, NULL },				/* Po */
272 	{ NULL, posts_wline },			/* Pq */
273 	{ NULL, NULL },				/* Qc */
274 	{ NULL, posts_wline },			/* Ql */
275 	{ NULL, NULL },				/* Qo */
276 	{ NULL, posts_wline },			/* Qq */
277 	{ NULL, NULL },				/* Re */
278 	{ NULL, posts_wline },			/* Rs */
279 	{ NULL, NULL },				/* Sc */
280 	{ NULL, NULL },				/* So */
281 	{ NULL, posts_wline },			/* Sq */
282 	{ NULL, posts_bool },			/* Sm */
283 	{ NULL, posts_text },			/* Sx */
284 	{ NULL, posts_text },			/* Sy */
285 	{ NULL, posts_text },			/* Tn */
286 	{ NULL, NULL },				/* Ux */
287 	{ NULL, NULL },				/* Xc */
288 	{ NULL, NULL },				/* Xo */
289 	{ NULL, posts_fo },			/* Fo */
290 	{ NULL, NULL },				/* Fc */
291 	{ NULL, NULL },				/* Oo */
292 	{ NULL, NULL },				/* Oc */
293 	{ NULL, posts_wline },			/* Bk */
294 	{ NULL, NULL },				/* Ek */
295 	{ NULL, posts_notext },			/* Bt */
296 	{ NULL, NULL },				/* Hf */
297 	{ NULL, NULL },				/* Fr */
298 	{ NULL, posts_notext },			/* Ud */
299 	{ pres_lb, posts_lb },			/* Lb */
300 	{ NULL, NULL },				/* Ap */
301 	{ NULL, posts_pp },			/* Lp */
302 	{ NULL, posts_text },			/* Lk */
303 	{ NULL, posts_text },			/* Mt */
304 	{ NULL, posts_wline },			/* Brq */
305 	{ NULL, NULL },				/* Bro */
306 	{ NULL, NULL },				/* Brc */
307 	{ NULL, posts_text },			/* %C */
308 	{ NULL, NULL },				/* Es */
309 	{ NULL, NULL },				/* En */
310 	{ NULL, NULL },				/* Dx */
311 	{ NULL, posts_text },			/* %Q */
312 };
313 
314 
315 int
316 mdoc_valid_pre(struct mdoc *mdoc,
317 		const struct mdoc_node *n)
318 {
319 	v_pre		*p;
320 	int		 line, pos;
321 	const char	*tp;
322 
323 	if (MDOC_TEXT == n->type) {
324 		tp = n->string;
325 		line = n->line;
326 		pos = n->pos;
327 		return(check_text(mdoc, line, pos, tp));
328 	}
329 
330 	if ( ! check_args(mdoc, n))
331 		return(0);
332 	if (NULL == mdoc_valids[n->tok].pre)
333 		return(1);
334 	for (p = mdoc_valids[n->tok].pre; *p; p++)
335 		if ( ! (*p)(mdoc, n))
336 			return(0);
337 	return(1);
338 }
339 
340 
341 int
342 mdoc_valid_post(struct mdoc *mdoc)
343 {
344 	v_post		*p;
345 
346 	/*
347 	 * This check occurs after the macro's children have been filled
348 	 * in: postfix validation.  Since this happens when we're
349 	 * rewinding the scope tree, it's possible to have multiple
350 	 * invocations (as by design, for now), we set bit MDOC_VALID to
351 	 * indicate that we've validated.
352 	 */
353 
354 	if (MDOC_VALID & mdoc->last->flags)
355 		return(1);
356 	mdoc->last->flags |= MDOC_VALID;
357 
358 	if (MDOC_TEXT == mdoc->last->type)
359 		return(1);
360 	if (MDOC_ROOT == mdoc->last->type)
361 		return(post_root(mdoc));
362 
363 	if (NULL == mdoc_valids[mdoc->last->tok].post)
364 		return(1);
365 	for (p = mdoc_valids[mdoc->last->tok].post; *p; p++)
366 		if ( ! (*p)(mdoc))
367 			return(0);
368 
369 	return(1);
370 }
371 
372 
373 static int
374 perr(struct mdoc *m, int line, int pos, enum merr type)
375 {
376 	char		 *p;
377 
378 	p = NULL;
379 	switch (type) {
380 	case (ETOOLONG):
381 		p = "text argument too long";
382 		break;
383 	case (EESCAPE):
384 		p = "invalid escape sequence";
385 		break;
386 	case (EPRINT):
387 		p = "invalid character";
388 		break;
389 	case (ENESTDISP):
390 		p = "displays may not be nested";
391 		break;
392 	case (EBOOL):
393 		p = "expected boolean value";
394 		break;
395 	case (EARGREP):
396 		p = "argument repeated";
397 		break;
398 	case (EMULTIDISP):
399 		p = "multiple display types specified";
400 		break;
401 	case (EMULTILIST):
402 		p = "multiple list types specified";
403 		break;
404 	case (ELISTTYPE):
405 		p = "missing list type";
406 		break;
407 	case (EDISPTYPE):
408 		p = "missing display type";
409 		break;
410 	case (ELINE):
411 		p = "expected line arguments";
412 		break;
413 	case (ENOPROLOGUE):
414 		p = "document has no prologue";
415 		break;
416 	case (ENODATA):
417 		p = "document has no data";
418 		break;
419 	case (EATT):
420 		p = "expected valid AT&T symbol";
421 		break;
422 	case (ENAME):
423 		p = "default name not yet set";
424 		break;
425 	}
426 	assert(p);
427 	return(mdoc_perr(m, line, pos, p));
428 }
429 
430 
431 static int
432 pwarn(struct mdoc *m, int line, int pos, enum mwarn type)
433 {
434 	char		 *p;
435 	enum mdoc_warn	  c;
436 
437 	c = WARN_SYNTAX;
438 	p = NULL;
439 	switch (type) {
440 	case (WPRINT):
441 		p = "invalid character";
442 		break;
443 	case (WBADMSEC):
444 		p = "inappropriate manual section";
445 		c = WARN_COMPAT;
446 		break;
447 	case (WBADSEC):
448 		p = "inappropriate document section";
449 		c = WARN_COMPAT;
450 		break;
451 	case (WARGVAL):
452 		p = "argument value suggested";
453 		c = WARN_COMPAT;
454 		break;
455 	case (WPROLREP):
456 		p = "prologue macros repeated";
457 		c = WARN_COMPAT;
458 		break;
459 	case (WPROLOOO):
460 		p = "prologue macros out-of-order";
461 		c = WARN_COMPAT;
462 		break;
463 	case (WESCAPE):
464 		p = "invalid escape sequence";
465 		break;
466 	case (WNOLINE):
467 		p = "suggested no line arguments";
468 		break;
469 	case (WLINE):
470 		p = "suggested line arguments";
471 		break;
472 	case (WMULTILINE):
473 		p = "suggested multi-line arguments";
474 		break;
475 	case (WNOMULTILINE):
476 		p = "suggested no multi-line arguments";
477 		break;
478 	case (WWRONGMSEC):
479 		p = "document section in wrong manual section";
480 		c = WARN_COMPAT;
481 		break;
482 	case (WSECOOO):
483 		p = "document section out of conventional order";
484 		break;
485 	case (WSECREP):
486 		p = "document section repeated";
487 		break;
488 	case (WBADSTAND):
489 		p = "unknown standard";
490 		break;
491 	case (WNAMESECINC):
492 		p = "NAME section contents incomplete/badly-ordered";
493 		break;
494 	}
495 	assert(p);
496 	return(mdoc_pwarn(m, line, pos, c, p));
497 }
498 
499 
500 
501 static inline int
502 warn_count(struct mdoc *m, const char *k,
503 		int want, const char *v, int has)
504 {
505 
506 	return(mdoc_warn(m, WARN_SYNTAX,
507 		"suggests %s %s %d (has %d)", v, k, want, has));
508 }
509 
510 
511 static inline int
512 err_count(struct mdoc *m, const char *k,
513 		int want, const char *v, int has)
514 {
515 
516 	return(mdoc_err(m,
517 		"requires %s %s %d (has %d)", v, k, want, has));
518 }
519 
520 
521 static inline int
522 count_child(struct mdoc *mdoc)
523 {
524 	int		  i;
525 	struct mdoc_node *n;
526 
527 	for (i = 0, n = mdoc->last->child; n; n = n->next, i++)
528 		/* Do nothing */ ;
529 
530 	return(i);
531 }
532 
533 
534 /*
535  * Build these up with macros because they're basically the same check
536  * for different inequalities.  Yes, this could be done with functions,
537  * but this is reasonable for now.
538  */
539 
540 #define CHECK_CHILD_DEFN(lvl, name, ineq) 			\
541 static int 							\
542 lvl##_child_##name(struct mdoc *mdoc, const char *p, int sz) 	\
543 { 								\
544 	int i; 							\
545 	if ((i = count_child(mdoc)) ineq sz) 			\
546 		return(1); 					\
547 	return(lvl##_count(mdoc, #ineq, sz, p, i)); 		\
548 }
549 
550 #define CHECK_BODY_DEFN(name, lvl, func, num) 			\
551 static int 							\
552 b##lvl##_##name(POST_ARGS) 					\
553 { 								\
554 	if (MDOC_BODY != mdoc->last->type) 			\
555 		return(1); 					\
556 	return(func(mdoc, "multi-line arguments", (num))); 	\
557 }
558 
559 #define CHECK_ELEM_DEFN(name, lvl, func, num) 			\
560 static int							\
561 e##lvl##_##name(POST_ARGS) 					\
562 { 								\
563 	assert(MDOC_ELEM == mdoc->last->type); 			\
564 	return(func(mdoc, "line arguments", (num))); 		\
565 }
566 
567 #define CHECK_HEAD_DEFN(name, lvl, func, num)			\
568 static int 							\
569 h##lvl##_##name(POST_ARGS) 					\
570 { 								\
571 	if (MDOC_HEAD != mdoc->last->type) 			\
572 		return(1); 					\
573 	return(func(mdoc, "line arguments", (num)));	 	\
574 }
575 
576 
577 CHECK_CHILD_DEFN(warn, gt, >)			/* warn_child_gt() */
578 CHECK_CHILD_DEFN(err, gt, >)			/* err_child_gt() */
579 CHECK_CHILD_DEFN(warn, eq, ==)			/* warn_child_eq() */
580 CHECK_CHILD_DEFN(err, eq, ==)			/* err_child_eq() */
581 CHECK_CHILD_DEFN(err, lt, <)			/* err_child_lt() */
582 CHECK_CHILD_DEFN(warn, lt, <)			/* warn_child_lt() */
583 CHECK_BODY_DEFN(ge1, warn, warn_child_gt, 0)	/* bwarn_ge1() */
584 CHECK_ELEM_DEFN(eq1, warn, warn_child_eq, 1)	/* ewarn_eq1() */
585 CHECK_ELEM_DEFN(eq0, warn, warn_child_eq, 0)	/* ewarn_eq0() */
586 CHECK_ELEM_DEFN(ge1, warn, warn_child_gt, 0)	/* ewarn_gt1() */
587 CHECK_ELEM_DEFN(eq1, err, err_child_eq, 1)	/* eerr_eq1() */
588 CHECK_ELEM_DEFN(le2, err, err_child_lt, 3)	/* eerr_le2() */
589 CHECK_ELEM_DEFN(eq0, err, err_child_eq, 0)	/* eerr_eq0() */
590 CHECK_ELEM_DEFN(ge1, err, err_child_gt, 0)	/* eerr_ge1() */
591 CHECK_HEAD_DEFN(eq0, err, err_child_eq, 0)	/* herr_eq0() */
592 CHECK_HEAD_DEFN(le1, warn, warn_child_lt, 2)	/* hwarn_le1() */
593 CHECK_HEAD_DEFN(ge1, err, err_child_gt, 0)	/* herr_ge1() */
594 CHECK_HEAD_DEFN(eq1, warn, warn_child_eq, 1)	/* hwarn_eq1() */
595 
596 
597 static int
598 check_stdarg(PRE_ARGS)
599 {
600 
601 	if (n->args && 1 == n->args->argc)
602 		if (MDOC_Std == n->args->argv[0].arg)
603 			return(1);
604 	return(nwarn(mdoc, n, WARGVAL));
605 }
606 
607 
608 static int
609 check_sec(PRE_ARGS, ...)
610 {
611 	enum mdoc_sec	 sec;
612 	va_list		 ap;
613 
614 	va_start(ap, n);
615 
616 	for (;;) {
617 		/* LINTED */
618 		sec = (enum mdoc_sec)va_arg(ap, int);
619 		if (SEC_CUSTOM == sec)
620 			break;
621 		if (sec != mdoc->lastsec)
622 			continue;
623 		va_end(ap);
624 		return(1);
625 	}
626 
627 	va_end(ap);
628 	return(nwarn(mdoc, n, WBADSEC));
629 }
630 
631 
632 static int
633 check_msec(PRE_ARGS, ...)
634 {
635 	va_list		 ap;
636 	int		 msec;
637 
638 	va_start(ap, n);
639 	for (;;) {
640 		/* LINTED */
641 		if (0 == (msec = va_arg(ap, int)))
642 			break;
643 		if (msec != mdoc->meta.msec)
644 			continue;
645 		va_end(ap);
646 		return(1);
647 	}
648 
649 	va_end(ap);
650 	return(nwarn(mdoc, n, WBADMSEC));
651 }
652 
653 
654 static int
655 check_args(struct mdoc *m, const struct mdoc_node *n)
656 {
657 	int		 i;
658 
659 	if (NULL == n->args)
660 		return(1);
661 
662 	assert(n->args->argc);
663 	for (i = 0; i < (int)n->args->argc; i++)
664 		if ( ! check_argv(m, n, &n->args->argv[i]))
665 			return(0);
666 
667 	return(1);
668 }
669 
670 
671 static int
672 check_argv(struct mdoc *m, const struct mdoc_node *n,
673 		const struct mdoc_argv *v)
674 {
675 	int		 i;
676 
677 	for (i = 0; i < (int)v->sz; i++)
678 		if ( ! check_text(m, v->line, v->pos, v->value[i]))
679 			return(0);
680 
681 	if (MDOC_Std == v->arg) {
682 		/* `Nm' name must be set. */
683 		if (v->sz || m->meta.name)
684 			return(1);
685 		return(nerr(m, n, ENAME));
686 	}
687 
688 	return(1);
689 }
690 
691 
692 static int
693 printwarn(struct mdoc *m, int ln, int pos)
694 {
695 	if (MDOC_IGN_CHARS & m->pflags)
696 		return(pwarn(m, ln, pos, WPRINT));
697 	return(perr(m, ln, pos, EPRINT));
698 }
699 
700 
701 static int
702 check_text(struct mdoc *mdoc, int line, int pos, const char *p)
703 {
704 	size_t		 c;
705 
706 	/* FIXME: indicate deprecated escapes \*(xx and \*x. */
707 
708 	for ( ; *p; p++) {
709 		if ('\t' == *p) {
710 			if ( ! (MDOC_LITERAL & mdoc->flags))
711 				if ( ! printwarn(mdoc, line, pos))
712 					return(0);
713 		} else if ( ! isprint((u_char)*p))
714 			if ( ! printwarn(mdoc, line, pos))
715 				return(0);
716 
717 		if ('\\' != *p)
718 			continue;
719 
720 		c = mdoc_isescape(p);
721 		if (c) {
722 			p += (int)c - 1;
723 			continue;
724 		}
725 		if ( ! (MDOC_IGN_ESCAPE & mdoc->pflags))
726 			return(perr(mdoc, line, pos, EESCAPE));
727 		if ( ! pwarn(mdoc, line, pos, WESCAPE))
728 			return(0);
729 	}
730 
731 	return(1);
732 }
733 
734 
735 
736 
737 static int
738 check_parent(PRE_ARGS, int tok, enum mdoc_type t)
739 {
740 
741 	assert(n->parent);
742 	if ((MDOC_ROOT == t || tok == n->parent->tok) &&
743 			(t == n->parent->type))
744 		return(1);
745 
746 	return(mdoc_nerr(mdoc, n, "require parent %s",
747 		MDOC_ROOT == t ? "<root>" : mdoc_macronames[tok]));
748 }
749 
750 
751 
752 static int
753 pre_display(PRE_ARGS)
754 {
755 	struct mdoc_node *node;
756 
757 	/* Display elements (`Bd', `D1'...) cannot be nested. */
758 
759 	if (MDOC_BLOCK != n->type)
760 		return(1);
761 
762 	/* LINTED */
763 	for (node = mdoc->last->parent; node; node = node->parent)
764 		if (MDOC_BLOCK == node->type)
765 			if (MDOC_Bd == node->tok)
766 				break;
767 	if (NULL == node)
768 		return(1);
769 
770 	return(nerr(mdoc, n, ENESTDISP));
771 }
772 
773 
774 static int
775 pre_bl(PRE_ARGS)
776 {
777 	int		 i, type, width, offset;
778 
779 	if (MDOC_BLOCK != n->type)
780 		return(1);
781 	if (NULL == n->args)
782 		return(nerr(mdoc, n, ELISTTYPE));
783 
784 	/* Make sure that only one type of list is specified.  */
785 
786 	type = offset = width = -1;
787 
788 	/* LINTED */
789 	for (i = 0; i < (int)n->args->argc; i++)
790 		switch (n->args->argv[i].arg) {
791 		case (MDOC_Bullet):
792 			/* FALLTHROUGH */
793 		case (MDOC_Dash):
794 			/* FALLTHROUGH */
795 		case (MDOC_Enum):
796 			/* FALLTHROUGH */
797 		case (MDOC_Hyphen):
798 			/* FALLTHROUGH */
799 		case (MDOC_Item):
800 			/* FALLTHROUGH */
801 		case (MDOC_Tag):
802 			/* FALLTHROUGH */
803 		case (MDOC_Diag):
804 			/* FALLTHROUGH */
805 		case (MDOC_Hang):
806 			/* FALLTHROUGH */
807 		case (MDOC_Ohang):
808 			/* FALLTHROUGH */
809 		case (MDOC_Inset):
810 			/* FALLTHROUGH */
811 		case (MDOC_Column):
812 			if (-1 == type) {
813 				type = n->args->argv[i].arg;
814 				break;
815 			}
816 			return(nerr(mdoc, n, EMULTILIST));
817 		case (MDOC_Width):
818 			if (-1 == width) {
819 				width = n->args->argv[i].arg;
820 				break;
821 			}
822 			return(nerr(mdoc, n, EARGREP));
823 		case (MDOC_Offset):
824 			if (-1 == offset) {
825 				offset = n->args->argv[i].arg;
826 				break;
827 			}
828 			return(nerr(mdoc, n, EARGREP));
829 		default:
830 			break;
831 		}
832 
833 	if (-1 == type)
834 		return(nerr(mdoc, n, ELISTTYPE));
835 
836 	switch (type) {
837 	case (MDOC_Column):
838 		/* FALLTHROUGH */
839 	case (MDOC_Diag):
840 		/* FALLTHROUGH */
841 	case (MDOC_Inset):
842 		/* FALLTHROUGH */
843 	case (MDOC_Item):
844 		if (-1 == width)
845 			break;
846 		return(mdoc_nwarn(mdoc, n, WARN_SYNTAX,
847 				"superfluous %s argument",
848 				mdoc_argnames[MDOC_Width]));
849 	case (MDOC_Tag):
850 		if (-1 != width)
851 			break;
852 		return(mdoc_nwarn(mdoc, n, WARN_SYNTAX,
853 				"suggest %s argument",
854 				mdoc_argnames[MDOC_Width]));
855 	default:
856 		break;
857 	}
858 
859 	return(1);
860 }
861 
862 
863 static int
864 pre_bd(PRE_ARGS)
865 {
866 	int		 i, type, err;
867 
868 	if (MDOC_BLOCK != n->type)
869 		return(1);
870 	if (NULL == n->args)
871 		return(nerr(mdoc, n, EDISPTYPE));
872 
873 	/* Make sure that only one type of display is specified.  */
874 
875 	/* LINTED */
876 	for (i = 0, err = type = 0; ! err &&
877 			i < (int)n->args->argc; i++)
878 		switch (n->args->argv[i].arg) {
879 		case (MDOC_Ragged):
880 			/* FALLTHROUGH */
881 		case (MDOC_Unfilled):
882 			/* FALLTHROUGH */
883 		case (MDOC_Filled):
884 			/* FALLTHROUGH */
885 		case (MDOC_Literal):
886 			/* FALLTHROUGH */
887 		case (MDOC_File):
888 			if (0 == type++)
889 				break;
890 			return(nerr(mdoc, n, EMULTIDISP));
891 		default:
892 			break;
893 		}
894 
895 	if (type)
896 		return(1);
897 	return(nerr(mdoc, n, EDISPTYPE));
898 }
899 
900 
901 static int
902 pre_ss(PRE_ARGS)
903 {
904 
905 	if (MDOC_BLOCK != n->type)
906 		return(1);
907 	return(check_parent(mdoc, n, MDOC_Sh, MDOC_BODY));
908 }
909 
910 
911 static int
912 pre_sh(PRE_ARGS)
913 {
914 
915 	if (MDOC_BLOCK != n->type)
916 		return(1);
917 	return(check_parent(mdoc, n, -1, MDOC_ROOT));
918 }
919 
920 
921 static int
922 pre_it(PRE_ARGS)
923 {
924 
925 	if (MDOC_BLOCK != n->type)
926 		return(1);
927 	return(check_parent(mdoc, n, MDOC_Bl, MDOC_BODY));
928 }
929 
930 
931 static int
932 pre_an(PRE_ARGS)
933 {
934 
935 	if (NULL == n->args || 1 == n->args->argc)
936 		return(1);
937 	return(mdoc_nerr(mdoc, n, "only one argument allowed"));
938 }
939 
940 
941 static int
942 pre_lb(PRE_ARGS)
943 {
944 
945 	return(check_sec(mdoc, n, SEC_LIBRARY, SEC_CUSTOM));
946 }
947 
948 
949 static int
950 pre_rv(PRE_ARGS)
951 {
952 
953 	if ( ! check_msec(mdoc, n, 2, 3, 0))
954 		return(0);
955 	return(check_stdarg(mdoc, n));
956 }
957 
958 
959 static int
960 pre_ex(PRE_ARGS)
961 {
962 
963 	if ( ! check_msec(mdoc, n, 1, 6, 8, 0))
964 		return(0);
965 	return(check_stdarg(mdoc, n));
966 }
967 
968 
969 static int
970 pre_er(PRE_ARGS)
971 {
972 
973 	return(check_msec(mdoc, n, 2, 0));
974 }
975 
976 
977 static int
978 pre_cd(PRE_ARGS)
979 {
980 
981 	return(check_msec(mdoc, n, 4, 0));
982 }
983 
984 
985 static int
986 pre_prologue(PRE_ARGS)
987 {
988 
989 	return(check_sec(mdoc, n, SEC_PROLOGUE, SEC_CUSTOM));
990 }
991 
992 
993 static int
994 pre_dt(PRE_ARGS)
995 {
996 
997 	if (0 == mdoc->meta.date || mdoc->meta.os)
998 		if ( ! nwarn(mdoc, n, WPROLOOO))
999 			return(0);
1000 	if (mdoc->meta.title)
1001 		if ( ! nwarn(mdoc, n, WPROLREP))
1002 			return(0);
1003 	return(1);
1004 }
1005 
1006 
1007 static int
1008 pre_os(PRE_ARGS)
1009 {
1010 
1011 	if (NULL == mdoc->meta.title || 0 == mdoc->meta.date)
1012 		if ( ! nwarn(mdoc, n, WPROLOOO))
1013 			return(0);
1014 	if (mdoc->meta.os)
1015 		if ( ! nwarn(mdoc, n, WPROLREP))
1016 			return(0);
1017 	return(1);
1018 }
1019 
1020 
1021 static int
1022 pre_dd(PRE_ARGS)
1023 {
1024 
1025 	if (mdoc->meta.title || mdoc->meta.os)
1026 		if ( ! nwarn(mdoc, n, WPROLOOO))
1027 			return(0);
1028 	if (mdoc->meta.date)
1029 		if ( ! nwarn(mdoc, n, WPROLREP))
1030 			return(0);
1031 	return(1);
1032 }
1033 
1034 
1035 static int
1036 post_bf(POST_ARGS)
1037 {
1038 	char		 *p;
1039 	struct mdoc_node *head;
1040 
1041 	if (MDOC_BLOCK != mdoc->last->type)
1042 		return(1);
1043 
1044 	head = mdoc->last->head;
1045 
1046 	if (NULL == mdoc->last->args) {
1047 		if (NULL == head->child ||
1048 				MDOC_TEXT != head->child->type)
1049 			return(mdoc_err(mdoc, "text argument expected"));
1050 
1051 		p = head->child->string;
1052 		if (0 == strcmp(p, "Em"))
1053 			return(1);
1054 		else if (0 == strcmp(p, "Li"))
1055 			return(1);
1056 		else if (0 == strcmp(p, "Sm"))
1057 			return(1);
1058 		return(mdoc_nerr(mdoc, head->child, "invalid font"));
1059 	}
1060 
1061 	if (head->child)
1062 		return(mdoc_err(mdoc, "one argument expected"));
1063 
1064 	return(1);
1065 }
1066 
1067 
1068 static int
1069 post_nm(POST_ARGS)
1070 {
1071 
1072 	if (mdoc->last->child)
1073 		return(1);
1074 	if (mdoc->meta.name)
1075 		return(1);
1076 	return(verr(mdoc, ENAME));
1077 }
1078 
1079 
1080 static int
1081 post_at(POST_ARGS)
1082 {
1083 
1084 	if (NULL == mdoc->last->child)
1085 		return(1);
1086 	if (MDOC_TEXT != mdoc->last->child->type)
1087 		return(verr(mdoc, EATT));
1088 	if (mdoc_a2att(mdoc->last->child->string))
1089 		return(1);
1090 	return(verr(mdoc, EATT));
1091 }
1092 
1093 
1094 static int
1095 post_an(POST_ARGS)
1096 {
1097 
1098 	if (mdoc->last->args) {
1099 		if (NULL == mdoc->last->child)
1100 			return(1);
1101 		return(verr(mdoc, ELINE));
1102 	}
1103 
1104 	if (mdoc->last->child)
1105 		return(1);
1106 	return(verr(mdoc, ELINE));
1107 }
1108 
1109 
1110 static int
1111 post_args(POST_ARGS)
1112 {
1113 
1114 	if (mdoc->last->args)
1115 		return(1);
1116 	return(verr(mdoc, ELINE));
1117 }
1118 
1119 
1120 static int
1121 post_it(POST_ARGS)
1122 {
1123 	int		  type, i, cols;
1124 	struct mdoc_node *n, *c;
1125 
1126 	if (MDOC_BLOCK != mdoc->last->type)
1127 		return(1);
1128 
1129 	n = mdoc->last->parent->parent;
1130 	if (NULL == n->args)
1131 		return(verr(mdoc, ELISTTYPE));
1132 
1133 	/* Some types require block-head, some not. */
1134 
1135 	/* LINTED */
1136 	for (cols = type = -1, i = 0; -1 == type &&
1137 			i < (int)n->args->argc; i++)
1138 		switch (n->args->argv[i].arg) {
1139 		case (MDOC_Tag):
1140 			/* FALLTHROUGH */
1141 		case (MDOC_Diag):
1142 			/* FALLTHROUGH */
1143 		case (MDOC_Hang):
1144 			/* FALLTHROUGH */
1145 		case (MDOC_Ohang):
1146 			/* FALLTHROUGH */
1147 		case (MDOC_Inset):
1148 			/* FALLTHROUGH */
1149 		case (MDOC_Bullet):
1150 			/* FALLTHROUGH */
1151 		case (MDOC_Dash):
1152 			/* FALLTHROUGH */
1153 		case (MDOC_Enum):
1154 			/* FALLTHROUGH */
1155 		case (MDOC_Hyphen):
1156 			/* FALLTHROUGH */
1157 		case (MDOC_Item):
1158 			type = n->args->argv[i].arg;
1159 			break;
1160 		case (MDOC_Column):
1161 			type = n->args->argv[i].arg;
1162 			cols = (int)n->args->argv[i].sz;
1163 			break;
1164 		default:
1165 			break;
1166 		}
1167 
1168 	if (-1 == type)
1169 		return(verr(mdoc, ELISTTYPE));
1170 
1171 	switch (type) {
1172 	case (MDOC_Tag):
1173 		if (NULL == mdoc->last->head->child)
1174 			if ( ! vwarn(mdoc, WLINE))
1175 				return(0);
1176 		break;
1177 	case (MDOC_Hang):
1178 		/* FALLTHROUGH */
1179 	case (MDOC_Ohang):
1180 		/* FALLTHROUGH */
1181 	case (MDOC_Inset):
1182 		/* FALLTHROUGH */
1183 	case (MDOC_Diag):
1184 		if (NULL == mdoc->last->head->child)
1185 			if ( ! vwarn(mdoc, WLINE))
1186 				return(0);
1187 		if (NULL == mdoc->last->body->child)
1188 			if ( ! vwarn(mdoc, WMULTILINE))
1189 				return(0);
1190 		break;
1191 	case (MDOC_Bullet):
1192 		/* FALLTHROUGH */
1193 	case (MDOC_Dash):
1194 		/* FALLTHROUGH */
1195 	case (MDOC_Enum):
1196 		/* FALLTHROUGH */
1197 	case (MDOC_Hyphen):
1198 		/* FALLTHROUGH */
1199 	case (MDOC_Item):
1200 		if (mdoc->last->head->child)
1201 			if ( ! vwarn(mdoc, WNOLINE))
1202 				return(0);
1203 		if (NULL == mdoc->last->body->child)
1204 			if ( ! vwarn(mdoc, WMULTILINE))
1205 				return(0);
1206 		break;
1207 	case (MDOC_Column):
1208 		if (NULL == mdoc->last->head->child)
1209 			if ( ! vwarn(mdoc, WLINE))
1210 				return(0);
1211 		if (mdoc->last->body->child)
1212 			if ( ! vwarn(mdoc, WNOMULTILINE))
1213 				return(0);
1214 		c = mdoc->last->child;
1215 		for (i = 0; c && MDOC_HEAD == c->type; c = c->next)
1216 			i++;
1217 		if (i == cols)
1218 			break;
1219 		return(mdoc_err(mdoc, "column mismatch (have "
1220 					"%d, want %d)", i, cols));
1221 	default:
1222 		break;
1223 	}
1224 
1225 	return(1);
1226 }
1227 
1228 
1229 static int
1230 post_bl(POST_ARGS)
1231 {
1232 	struct mdoc_node	*n;
1233 
1234 	if (MDOC_BODY != mdoc->last->type)
1235 		return(1);
1236 	if (NULL == mdoc->last->child)
1237 		return(1);
1238 
1239 	/* LINTED */
1240 	for (n = mdoc->last->child; n; n = n->next) {
1241 		if (MDOC_BLOCK == n->type)
1242 			if (MDOC_It == n->tok)
1243 				continue;
1244 		return(mdoc_nerr(mdoc, n, "bad child of parent %s",
1245 				mdoc_macronames[mdoc->last->tok]));
1246 	}
1247 
1248 	return(1);
1249 }
1250 
1251 
1252 static int
1253 ebool(struct mdoc *mdoc)
1254 {
1255 	struct mdoc_node *n;
1256 
1257 	/* LINTED */
1258 	for (n = mdoc->last->child; n; n = n->next) {
1259 		if (MDOC_TEXT != n->type)
1260 			break;
1261 		if (0 == strcmp(n->string, "on"))
1262 			continue;
1263 		if (0 == strcmp(n->string, "off"))
1264 			continue;
1265 		break;
1266 	}
1267 
1268 	if (NULL == n)
1269 		return(1);
1270 	return(nerr(mdoc, n, EBOOL));
1271 }
1272 
1273 
1274 static int
1275 post_root(POST_ARGS)
1276 {
1277 
1278 	if (NULL == mdoc->first->child)
1279 		return(verr(mdoc, ENODATA));
1280 	if (SEC_PROLOGUE == mdoc->lastnamed)
1281 		return(verr(mdoc, ENOPROLOGUE));
1282 
1283 	if (MDOC_BLOCK != mdoc->first->child->type)
1284 		return(verr(mdoc, ENODATA));
1285 	if (MDOC_Sh != mdoc->first->child->tok)
1286 		return(verr(mdoc, ENODATA));
1287 
1288 	return(1);
1289 }
1290 
1291 
1292 static int
1293 post_st(POST_ARGS)
1294 {
1295 
1296 	if (mdoc_a2st(mdoc->last->child->string))
1297 		return(1);
1298 	return(vwarn(mdoc, WBADSTAND));
1299 }
1300 
1301 
1302 static int
1303 post_sh(POST_ARGS)
1304 {
1305 
1306 	if (MDOC_HEAD == mdoc->last->type)
1307 		return(post_sh_head(mdoc));
1308 	if (MDOC_BODY == mdoc->last->type)
1309 		return(post_sh_body(mdoc));
1310 
1311 	return(1);
1312 }
1313 
1314 
1315 static int
1316 post_sh_body(POST_ARGS)
1317 {
1318 	struct mdoc_node *n;
1319 
1320 	if (SEC_NAME != mdoc->lastnamed)
1321 		return(1);
1322 
1323 	/*
1324 	 * Warn if the NAME section doesn't contain the `Nm' and `Nd'
1325 	 * macros (can have multiple `Nm' and one `Nd').  Note that the
1326 	 * children of the BODY declaration can also be "text".
1327 	 */
1328 
1329 	if (NULL == (n = mdoc->last->child))
1330 		return(vwarn(mdoc, WNAMESECINC));
1331 
1332 	for ( ; n && n->next; n = n->next) {
1333 		if (MDOC_ELEM == n->type && MDOC_Nm == n->tok)
1334 			continue;
1335 		if (MDOC_TEXT == n->type)
1336 			continue;
1337 		if ( ! vwarn(mdoc, WNAMESECINC))
1338 			return(0);
1339 	}
1340 
1341 	if (MDOC_ELEM == n->type && MDOC_Nd == n->tok)
1342 		return(1);
1343 	return(vwarn(mdoc, WNAMESECINC));
1344 }
1345 
1346 
1347 static int
1348 post_sh_head(POST_ARGS)
1349 {
1350 	char		        buf[64];
1351 	enum mdoc_sec	        sec;
1352 	const struct mdoc_node *n;
1353 
1354 	/*
1355 	 * Process a new section.  Sections are either "named" or
1356 	 * "custom"; custom sections are user-defined, while named ones
1357 	 * usually follow a conventional order and may only appear in
1358 	 * certain manual sections.
1359 	 */
1360 
1361 	assert(MDOC_Sh == mdoc->last->tok);
1362 
1363 	/* This is just concat() inlined, which is irritating. */
1364 
1365 	buf[0] = 0;
1366 	for (n = mdoc->last->child; n; n = n->next) {
1367 		assert(MDOC_TEXT == n->type);
1368 		if (strlcat(buf, n->string, 64) >= 64)
1369 			return(nerr(mdoc, n, ETOOLONG));
1370 		if (NULL == n->next)
1371 			continue;
1372 		if (strlcat(buf, " ", 64) >= 64)
1373 			return(nerr(mdoc, n, ETOOLONG));
1374 	}
1375 
1376 	sec = mdoc_atosec(buf);
1377 
1378 	/* The NAME section should always be first. */
1379 
1380 	if (SEC_BODY == mdoc->lastnamed && SEC_NAME != sec)
1381 		return(vwarn(mdoc, WSECOOO));
1382 	if (SEC_CUSTOM == sec)
1383 		return(1);
1384 
1385 	/* Check for repeated or out-of-order sections. */
1386 
1387 	if (sec == mdoc->lastnamed)
1388 		return(vwarn(mdoc, WSECREP));
1389 	if (sec < mdoc->lastnamed)
1390 		return(vwarn(mdoc, WSECOOO));
1391 
1392 	/* Check particular section/manual section conventions. */
1393 
1394 	switch (sec) {
1395 	case (SEC_LIBRARY):
1396 		switch (mdoc->meta.msec) {
1397 		case (2):
1398 			/* FALLTHROUGH */
1399 		case (3):
1400 			break;
1401 		default:
1402 			return(vwarn(mdoc, WWRONGMSEC));
1403 		}
1404 		break;
1405 	default:
1406 		break;
1407 	}
1408 
1409 	return(1);
1410 }
1411 
1412 
1413 static int
1414 pre_fd(PRE_ARGS)
1415 {
1416 
1417 	return(check_sec(mdoc, n, SEC_SYNOPSIS, SEC_CUSTOM));
1418 }
1419