xref: /titanic_51/usr/src/cmd/mandoc/mdoc_macro.c (revision 1886f67eb9de99edbcda88765f2c603a30c87fc2)
1 /*	$Id: mdoc_macro.c,v 1.125 2013/12/24 20:45:27 schwarze Exp $ */
2 /*
3  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
4  * Copyright (c) 2010, 2012, 2013 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 #include <assert.h>
23 #include <ctype.h>
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include <time.h>
28 
29 #include "mdoc.h"
30 #include "mandoc.h"
31 #include "libmdoc.h"
32 #include "libmandoc.h"
33 
34 enum	rew {	/* see rew_dohalt() */
35 	REWIND_NONE,
36 	REWIND_THIS,
37 	REWIND_MORE,
38 	REWIND_FORCE,
39 	REWIND_LATER,
40 	REWIND_ERROR
41 };
42 
43 static	int	  	blk_full(MACRO_PROT_ARGS);
44 static	int	  	blk_exp_close(MACRO_PROT_ARGS);
45 static	int	  	blk_part_exp(MACRO_PROT_ARGS);
46 static	int	  	blk_part_imp(MACRO_PROT_ARGS);
47 static	int	  	ctx_synopsis(MACRO_PROT_ARGS);
48 static	int	  	in_line_eoln(MACRO_PROT_ARGS);
49 static	int	  	in_line_argn(MACRO_PROT_ARGS);
50 static	int	  	in_line(MACRO_PROT_ARGS);
51 static	int	  	obsolete(MACRO_PROT_ARGS);
52 static	int	  	phrase_ta(MACRO_PROT_ARGS);
53 
54 static	int		dword(struct mdoc *, int, int, const char *,
55 				 enum mdelim, int);
56 static	int	  	append_delims(struct mdoc *,
57 				int, int *, char *);
58 static	enum mdoct	lookup(enum mdoct, const char *);
59 static	enum mdoct	lookup_raw(const char *);
60 static	int		make_pending(struct mdoc_node *, enum mdoct,
61 				struct mdoc *, int, int);
62 static	int	  	phrase(struct mdoc *, int, int, char *);
63 static	enum mdoct 	rew_alt(enum mdoct);
64 static	enum rew  	rew_dohalt(enum mdoct, enum mdoc_type,
65 				const struct mdoc_node *);
66 static	int	  	rew_elem(struct mdoc *, enum mdoct);
67 static	int	  	rew_last(struct mdoc *,
68 				const struct mdoc_node *);
69 static	int	  	rew_sub(enum mdoc_type, struct mdoc *,
70 				enum mdoct, int, int);
71 
72 const	struct mdoc_macro __mdoc_macros[MDOC_MAX] = {
73 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Ap */
74 	{ in_line_eoln, MDOC_PROLOGUE }, /* Dd */
75 	{ in_line_eoln, MDOC_PROLOGUE }, /* Dt */
76 	{ in_line_eoln, MDOC_PROLOGUE }, /* Os */
77 	{ blk_full, MDOC_PARSED | MDOC_JOIN }, /* Sh */
78 	{ blk_full, MDOC_PARSED | MDOC_JOIN }, /* Ss */
79 	{ in_line_eoln, 0 }, /* Pp */
80 	{ blk_part_imp, MDOC_PARSED | MDOC_JOIN }, /* D1 */
81 	{ blk_part_imp, MDOC_PARSED | MDOC_JOIN }, /* Dl */
82 	{ blk_full, MDOC_EXPLICIT }, /* Bd */
83 	{ blk_exp_close, MDOC_EXPLICIT | MDOC_JOIN }, /* Ed */
84 	{ blk_full, MDOC_EXPLICIT }, /* Bl */
85 	{ blk_exp_close, MDOC_EXPLICIT | MDOC_JOIN }, /* El */
86 	{ blk_full, MDOC_PARSED | MDOC_JOIN }, /* It */
87 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Ad */
88 	{ in_line, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* An */
89 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Ar */
90 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Cd */
91 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Cm */
92 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Dv */
93 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Er */
94 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Ev */
95 	{ in_line_eoln, 0 }, /* Ex */
96 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Fa */
97 	{ in_line_eoln, 0 }, /* Fd */
98 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Fl */
99 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Fn */
100 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Ft */
101 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Ic */
102 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* In */
103 	{ in_line, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Li */
104 	{ blk_full, MDOC_JOIN }, /* Nd */
105 	{ ctx_synopsis, MDOC_CALLABLE | MDOC_PARSED }, /* Nm */
106 	{ blk_part_imp, MDOC_CALLABLE | MDOC_PARSED }, /* Op */
107 	{ obsolete, 0 }, /* Ot */
108 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Pa */
109 	{ in_line_eoln, 0 }, /* Rv */
110 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* St */
111 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Va */
112 	{ ctx_synopsis, MDOC_CALLABLE | MDOC_PARSED }, /* Vt */
113 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* Xr */
114 	{ in_line_eoln, MDOC_JOIN }, /* %A */
115 	{ in_line_eoln, MDOC_JOIN }, /* %B */
116 	{ in_line_eoln, MDOC_JOIN }, /* %D */
117 	{ in_line_eoln, MDOC_JOIN }, /* %I */
118 	{ in_line_eoln, MDOC_JOIN }, /* %J */
119 	{ in_line_eoln, 0 }, /* %N */
120 	{ in_line_eoln, MDOC_JOIN }, /* %O */
121 	{ in_line_eoln, 0 }, /* %P */
122 	{ in_line_eoln, MDOC_JOIN }, /* %R */
123 	{ in_line_eoln, MDOC_JOIN }, /* %T */
124 	{ in_line_eoln, 0 }, /* %V */
125 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED |
126 			 MDOC_EXPLICIT | MDOC_JOIN }, /* Ac */
127 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED |
128 			MDOC_EXPLICIT | MDOC_JOIN }, /* Ao */
129 	{ blk_part_imp, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Aq */
130 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* At */
131 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED |
132 			 MDOC_EXPLICIT | MDOC_JOIN }, /* Bc */
133 	{ blk_full, MDOC_EXPLICIT }, /* Bf */
134 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED |
135 			MDOC_EXPLICIT | MDOC_JOIN }, /* Bo */
136 	{ blk_part_imp, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Bq */
137 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* Bsx */
138 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* Bx */
139 	{ in_line_eoln, 0 }, /* Db */
140 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED |
141 			 MDOC_EXPLICIT | MDOC_JOIN }, /* Dc */
142 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED |
143 			MDOC_EXPLICIT | MDOC_JOIN }, /* Do */
144 	{ blk_part_imp, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Dq */
145 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED | MDOC_EXPLICIT }, /* Ec */
146 	{ blk_exp_close, MDOC_EXPLICIT | MDOC_JOIN }, /* Ef */
147 	{ in_line, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Em */
148 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED | MDOC_EXPLICIT }, /* Eo */
149 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* Fx */
150 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Ms */
151 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED |
152 			MDOC_IGNDELIM | MDOC_JOIN }, /* No */
153 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED |
154 			MDOC_IGNDELIM | MDOC_JOIN }, /* Ns */
155 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* Nx */
156 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* Ox */
157 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED |
158 			 MDOC_EXPLICIT | MDOC_JOIN }, /* Pc */
159 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED | MDOC_IGNDELIM }, /* Pf */
160 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED |
161 			MDOC_EXPLICIT | MDOC_JOIN }, /* Po */
162 	{ blk_part_imp, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Pq */
163 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED |
164 			 MDOC_EXPLICIT | MDOC_JOIN }, /* Qc */
165 	{ blk_part_imp, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Ql */
166 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED |
167 			MDOC_EXPLICIT | MDOC_JOIN }, /* Qo */
168 	{ blk_part_imp, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Qq */
169 	{ blk_exp_close, MDOC_EXPLICIT | MDOC_JOIN }, /* Re */
170 	{ blk_full, MDOC_EXPLICIT }, /* Rs */
171 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED |
172 			 MDOC_EXPLICIT | MDOC_JOIN }, /* Sc */
173 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED |
174 			MDOC_EXPLICIT | MDOC_JOIN }, /* So */
175 	{ blk_part_imp, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Sq */
176 	{ in_line_eoln, 0 }, /* Sm */
177 	{ in_line, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Sx */
178 	{ in_line, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Sy */
179 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Tn */
180 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Ux */
181 	{ blk_exp_close, MDOC_EXPLICIT | MDOC_CALLABLE | MDOC_PARSED }, /* Xc */
182 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED | MDOC_EXPLICIT }, /* Xo */
183 	{ blk_full, MDOC_EXPLICIT | MDOC_CALLABLE }, /* Fo */
184 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED |
185 			 MDOC_EXPLICIT | MDOC_JOIN }, /* Fc */
186 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED |
187 			MDOC_EXPLICIT | MDOC_JOIN }, /* Oo */
188 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED |
189 			 MDOC_EXPLICIT | MDOC_JOIN }, /* Oc */
190 	{ blk_full, MDOC_EXPLICIT }, /* Bk */
191 	{ blk_exp_close, MDOC_EXPLICIT | MDOC_JOIN }, /* Ek */
192 	{ in_line_eoln, 0 }, /* Bt */
193 	{ in_line_eoln, 0 }, /* Hf */
194 	{ obsolete, 0 }, /* Fr */
195 	{ in_line_eoln, 0 }, /* Ud */
196 	{ in_line, 0 }, /* Lb */
197 	{ in_line_eoln, 0 }, /* Lp */
198 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Lk */
199 	{ in_line, MDOC_CALLABLE | MDOC_PARSED }, /* Mt */
200 	{ blk_part_imp, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Brq */
201 	{ blk_part_exp, MDOC_CALLABLE | MDOC_PARSED |
202 			MDOC_EXPLICIT | MDOC_JOIN }, /* Bro */
203 	{ blk_exp_close, MDOC_CALLABLE | MDOC_PARSED |
204 			 MDOC_EXPLICIT | MDOC_JOIN }, /* Brc */
205 	{ in_line_eoln, MDOC_JOIN }, /* %C */
206 	{ obsolete, 0 }, /* Es */
207 	{ obsolete, 0 }, /* En */
208 	{ in_line_argn, MDOC_CALLABLE | MDOC_PARSED }, /* Dx */
209 	{ in_line_eoln, MDOC_JOIN }, /* %Q */
210 	{ in_line_eoln, 0 }, /* br */
211 	{ in_line_eoln, 0 }, /* sp */
212 	{ in_line_eoln, 0 }, /* %U */
213 	{ phrase_ta, MDOC_CALLABLE | MDOC_PARSED | MDOC_JOIN }, /* Ta */
214 };
215 
216 const	struct mdoc_macro * const mdoc_macros = __mdoc_macros;
217 
218 
219 /*
220  * This is called at the end of parsing.  It must traverse up the tree,
221  * closing out open [implicit] scopes.  Obviously, open explicit scopes
222  * are errors.
223  */
224 int
225 mdoc_macroend(struct mdoc *mdoc)
226 {
227 	struct mdoc_node *n;
228 
229 	/* Scan for open explicit scopes. */
230 
231 	n = MDOC_VALID & mdoc->last->flags ?
232 			mdoc->last->parent : mdoc->last;
233 
234 	for ( ; n; n = n->parent)
235 		if (MDOC_BLOCK == n->type &&
236 		    MDOC_EXPLICIT & mdoc_macros[n->tok].flags)
237 			mdoc_nmsg(mdoc, n, MANDOCERR_SCOPEEXIT);
238 
239 	/* Rewind to the first. */
240 
241 	return(rew_last(mdoc, mdoc->first));
242 }
243 
244 
245 /*
246  * Look up a macro from within a subsequent context.
247  */
248 static enum mdoct
249 lookup(enum mdoct from, const char *p)
250 {
251 
252 	if ( ! (MDOC_PARSED & mdoc_macros[from].flags))
253 		return(MDOC_MAX);
254 	return(lookup_raw(p));
255 }
256 
257 
258 /*
259  * Lookup a macro following the initial line macro.
260  */
261 static enum mdoct
262 lookup_raw(const char *p)
263 {
264 	enum mdoct	 res;
265 
266 	if (MDOC_MAX == (res = mdoc_hash_find(p)))
267 		return(MDOC_MAX);
268 	if (MDOC_CALLABLE & mdoc_macros[res].flags)
269 		return(res);
270 	return(MDOC_MAX);
271 }
272 
273 
274 static int
275 rew_last(struct mdoc *mdoc, const struct mdoc_node *to)
276 {
277 	struct mdoc_node *n, *np;
278 
279 	assert(to);
280 	mdoc->next = MDOC_NEXT_SIBLING;
281 
282 	/* LINTED */
283 	while (mdoc->last != to) {
284 		/*
285 		 * Save the parent here, because we may delete the
286 		 * mdoc->last node in the post-validation phase and reset
287 		 * it to mdoc->last->parent, causing a step in the closing
288 		 * out to be lost.
289 		 */
290 		np = mdoc->last->parent;
291 		if ( ! mdoc_valid_post(mdoc))
292 			return(0);
293 		n = mdoc->last;
294 		mdoc->last = np;
295 		assert(mdoc->last);
296 		mdoc->last->last = n;
297 	}
298 
299 	return(mdoc_valid_post(mdoc));
300 }
301 
302 
303 /*
304  * For a block closing macro, return the corresponding opening one.
305  * Otherwise, return the macro itself.
306  */
307 static enum mdoct
308 rew_alt(enum mdoct tok)
309 {
310 	switch (tok) {
311 	case (MDOC_Ac):
312 		return(MDOC_Ao);
313 	case (MDOC_Bc):
314 		return(MDOC_Bo);
315 	case (MDOC_Brc):
316 		return(MDOC_Bro);
317 	case (MDOC_Dc):
318 		return(MDOC_Do);
319 	case (MDOC_Ec):
320 		return(MDOC_Eo);
321 	case (MDOC_Ed):
322 		return(MDOC_Bd);
323 	case (MDOC_Ef):
324 		return(MDOC_Bf);
325 	case (MDOC_Ek):
326 		return(MDOC_Bk);
327 	case (MDOC_El):
328 		return(MDOC_Bl);
329 	case (MDOC_Fc):
330 		return(MDOC_Fo);
331 	case (MDOC_Oc):
332 		return(MDOC_Oo);
333 	case (MDOC_Pc):
334 		return(MDOC_Po);
335 	case (MDOC_Qc):
336 		return(MDOC_Qo);
337 	case (MDOC_Re):
338 		return(MDOC_Rs);
339 	case (MDOC_Sc):
340 		return(MDOC_So);
341 	case (MDOC_Xc):
342 		return(MDOC_Xo);
343 	default:
344 		return(tok);
345 	}
346 	/* NOTREACHED */
347 }
348 
349 
350 /*
351  * Rewinding to tok, how do we have to handle *p?
352  * REWIND_NONE: *p would delimit tok, but no tok scope is open
353  *   inside *p, so there is no need to rewind anything at all.
354  * REWIND_THIS: *p matches tok, so rewind *p and nothing else.
355  * REWIND_MORE: *p is implicit, rewind it and keep searching for tok.
356  * REWIND_FORCE: *p is explicit, but tok is full, force rewinding *p.
357  * REWIND_LATER: *p is explicit and still open, postpone rewinding.
358  * REWIND_ERROR: No tok block is open at all.
359  */
360 static enum rew
361 rew_dohalt(enum mdoct tok, enum mdoc_type type,
362 		const struct mdoc_node *p)
363 {
364 
365 	/*
366 	 * No matching token, no delimiting block, no broken block.
367 	 * This can happen when full implicit macros are called for
368 	 * the first time but try to rewind their previous
369 	 * instance anyway.
370 	 */
371 	if (MDOC_ROOT == p->type)
372 		return(MDOC_BLOCK == type &&
373 		    MDOC_EXPLICIT & mdoc_macros[tok].flags ?
374 		    REWIND_ERROR : REWIND_NONE);
375 
376 	/*
377 	 * When starting to rewind, skip plain text
378 	 * and nodes that have already been rewound.
379 	 */
380 	if (MDOC_TEXT == p->type || MDOC_VALID & p->flags)
381 		return(REWIND_MORE);
382 
383 	/*
384 	 * The easiest case:  Found a matching token.
385 	 * This applies to both blocks and elements.
386 	 */
387 	tok = rew_alt(tok);
388 	if (tok == p->tok)
389 		return(p->end ? REWIND_NONE :
390 		    type == p->type ? REWIND_THIS : REWIND_MORE);
391 
392 	/*
393 	 * While elements do require rewinding for themselves,
394 	 * they never affect rewinding of other nodes.
395 	 */
396 	if (MDOC_ELEM == p->type)
397 		return(REWIND_MORE);
398 
399 	/*
400 	 * Blocks delimited by our target token get REWIND_MORE.
401 	 * Blocks delimiting our target token get REWIND_NONE.
402 	 */
403 	switch (tok) {
404 	case (MDOC_Bl):
405 		if (MDOC_It == p->tok)
406 			return(REWIND_MORE);
407 		break;
408 	case (MDOC_It):
409 		if (MDOC_BODY == p->type && MDOC_Bl == p->tok)
410 			return(REWIND_NONE);
411 		break;
412 	/*
413 	 * XXX Badly nested block handling still fails badly
414 	 * when one block is breaking two blocks of the same type.
415 	 * This is an incomplete and extremely ugly workaround,
416 	 * required to let the OpenBSD tree build.
417 	 */
418 	case (MDOC_Oo):
419 		if (MDOC_Op == p->tok)
420 			return(REWIND_MORE);
421 		break;
422 	case (MDOC_Nm):
423 		return(REWIND_NONE);
424 	case (MDOC_Nd):
425 		/* FALLTHROUGH */
426 	case (MDOC_Ss):
427 		if (MDOC_BODY == p->type && MDOC_Sh == p->tok)
428 			return(REWIND_NONE);
429 		/* FALLTHROUGH */
430 	case (MDOC_Sh):
431 		if (MDOC_Nd == p->tok || MDOC_Ss == p->tok ||
432 		    MDOC_Sh == p->tok)
433 			return(REWIND_MORE);
434 		break;
435 	default:
436 		break;
437 	}
438 
439 	/*
440 	 * Default block rewinding rules.
441 	 * In particular, always skip block end markers,
442 	 * and let all blocks rewind Nm children.
443 	 */
444 	if (ENDBODY_NOT != p->end || MDOC_Nm == p->tok ||
445 	    (MDOC_BLOCK == p->type &&
446 	    ! (MDOC_EXPLICIT & mdoc_macros[tok].flags)))
447 		return(REWIND_MORE);
448 
449 	/*
450 	 * By default, closing out full blocks
451 	 * forces closing of broken explicit blocks,
452 	 * while closing out partial blocks
453 	 * allows delayed rewinding by default.
454 	 */
455 	return (&blk_full == mdoc_macros[tok].fp ?
456 	    REWIND_FORCE : REWIND_LATER);
457 }
458 
459 
460 static int
461 rew_elem(struct mdoc *mdoc, enum mdoct tok)
462 {
463 	struct mdoc_node *n;
464 
465 	n = mdoc->last;
466 	if (MDOC_ELEM != n->type)
467 		n = n->parent;
468 	assert(MDOC_ELEM == n->type);
469 	assert(tok == n->tok);
470 
471 	return(rew_last(mdoc, n));
472 }
473 
474 
475 /*
476  * We are trying to close a block identified by tok,
477  * but the child block *broken is still open.
478  * Thus, postpone closing the tok block
479  * until the rew_sub call closing *broken.
480  */
481 static int
482 make_pending(struct mdoc_node *broken, enum mdoct tok,
483 		struct mdoc *mdoc, int line, int ppos)
484 {
485 	struct mdoc_node *breaker;
486 
487 	/*
488 	 * Iterate backwards, searching for the block matching tok,
489 	 * that is, the block breaking the *broken block.
490 	 */
491 	for (breaker = broken->parent; breaker; breaker = breaker->parent) {
492 
493 		/*
494 		 * If the *broken block had already been broken before
495 		 * and we encounter its breaker, make the tok block
496 		 * pending on the inner breaker.
497 		 * Graphically, "[A breaker=[B broken=[C->B B] tok=A] C]"
498 		 * becomes "[A broken=[B [C->B B] tok=A] C]"
499 		 * and finally "[A [B->A [C->B B] A] C]".
500 		 */
501 		if (breaker == broken->pending) {
502 			broken = breaker;
503 			continue;
504 		}
505 
506 		if (REWIND_THIS != rew_dohalt(tok, MDOC_BLOCK, breaker))
507 			continue;
508 		if (MDOC_BODY == broken->type)
509 			broken = broken->parent;
510 
511 		/*
512 		 * Found the breaker.
513 		 * If another, outer breaker is already pending on
514 		 * the *broken block, we must not clobber the link
515 		 * to the outer breaker, but make it pending on the
516 		 * new, now inner breaker.
517 		 * Graphically, "[A breaker=[B broken=[C->A A] tok=B] C]"
518 		 * becomes "[A breaker=[B->A broken=[C A] tok=B] C]"
519 		 * and finally "[A [B->A [C->B A] B] C]".
520 		 */
521 		if (broken->pending) {
522 			struct mdoc_node *taker;
523 
524 			/*
525 			 * If the breaker had also been broken before,
526 			 * it cannot take on the outer breaker itself,
527 			 * but must hand it on to its own breakers.
528 			 * Graphically, this is the following situation:
529 			 * "[A [B breaker=[C->B B] broken=[D->A A] tok=C] D]"
530 			 * "[A taker=[B->A breaker=[C->B B] [D->C A] C] D]"
531 			 */
532 			taker = breaker;
533 			while (taker->pending)
534 				taker = taker->pending;
535 			taker->pending = broken->pending;
536 		}
537 		broken->pending = breaker;
538 		mandoc_vmsg(MANDOCERR_SCOPENEST, mdoc->parse, line, ppos,
539 				"%s breaks %s", mdoc_macronames[tok],
540 				mdoc_macronames[broken->tok]);
541 		return(1);
542 	}
543 
544 	/*
545 	 * Found no matching block for tok.
546 	 * Are you trying to close a block that is not open?
547 	 */
548 	return(0);
549 }
550 
551 
552 static int
553 rew_sub(enum mdoc_type t, struct mdoc *mdoc,
554 		enum mdoct tok, int line, int ppos)
555 {
556 	struct mdoc_node *n;
557 
558 	n = mdoc->last;
559 	while (n) {
560 		switch (rew_dohalt(tok, t, n)) {
561 		case (REWIND_NONE):
562 			return(1);
563 		case (REWIND_THIS):
564 			n->lastline = line -
565 			    (MDOC_NEWLINE & mdoc->flags &&
566 			     ! (MDOC_EXPLICIT & mdoc_macros[tok].flags));
567 			break;
568 		case (REWIND_FORCE):
569 			mandoc_vmsg(MANDOCERR_SCOPEBROKEN, mdoc->parse,
570 					line, ppos, "%s breaks %s",
571 					mdoc_macronames[tok],
572 					mdoc_macronames[n->tok]);
573 			/* FALLTHROUGH */
574 		case (REWIND_MORE):
575 			n->lastline = line -
576 			    (MDOC_NEWLINE & mdoc->flags ? 1 : 0);
577 			n = n->parent;
578 			continue;
579 		case (REWIND_LATER):
580 			if (make_pending(n, tok, mdoc, line, ppos) ||
581 			    MDOC_BLOCK != t)
582 				return(1);
583 			/* FALLTHROUGH */
584 		case (REWIND_ERROR):
585 			mdoc_pmsg(mdoc, line, ppos, MANDOCERR_NOSCOPE);
586 			return(1);
587 		}
588 		break;
589 	}
590 
591 	assert(n);
592 	if ( ! rew_last(mdoc, n))
593 		return(0);
594 
595 	/*
596 	 * The current block extends an enclosing block.
597 	 * Now that the current block ends, close the enclosing block, too.
598 	 */
599 	while (NULL != (n = n->pending)) {
600 		if ( ! rew_last(mdoc, n))
601 			return(0);
602 		if (MDOC_HEAD == n->type &&
603 		    ! mdoc_body_alloc(mdoc, n->line, n->pos, n->tok))
604 			return(0);
605 	}
606 
607 	return(1);
608 }
609 
610 /*
611  * Allocate a word and check whether it's punctuation or not.
612  * Punctuation consists of those tokens found in mdoc_isdelim().
613  */
614 static int
615 dword(struct mdoc *mdoc, int line, int col, const char *p,
616 		enum mdelim d, int may_append)
617 {
618 
619 	if (DELIM_MAX == d)
620 		d = mdoc_isdelim(p);
621 
622 	if (may_append &&
623 	    ! ((MDOC_SYNOPSIS | MDOC_KEEP | MDOC_SMOFF) & mdoc->flags) &&
624 	    DELIM_NONE == d && MDOC_TEXT == mdoc->last->type &&
625 	    DELIM_NONE == mdoc_isdelim(mdoc->last->string)) {
626 		mdoc_word_append(mdoc, p);
627 		return(1);
628 	}
629 
630 	if ( ! mdoc_word_alloc(mdoc, line, col, p))
631 		return(0);
632 
633 	if (DELIM_OPEN == d)
634 		mdoc->last->flags |= MDOC_DELIMO;
635 
636 	/*
637 	 * Closing delimiters only suppress the preceding space
638 	 * when they follow something, not when they start a new
639 	 * block or element, and not when they follow `No'.
640 	 *
641 	 * XXX	Explicitly special-casing MDOC_No here feels
642 	 *	like a layering violation.  Find a better way
643 	 *	and solve this in the code related to `No'!
644 	 */
645 
646 	else if (DELIM_CLOSE == d && mdoc->last->prev &&
647 			mdoc->last->prev->tok != MDOC_No &&
648 			mdoc->last->parent->tok != MDOC_Fd)
649 		mdoc->last->flags |= MDOC_DELIMC;
650 
651 	return(1);
652 }
653 
654 static int
655 append_delims(struct mdoc *mdoc, int line, int *pos, char *buf)
656 {
657 	int		 la;
658 	enum margserr	 ac;
659 	char		*p;
660 
661 	if ('\0' == buf[*pos])
662 		return(1);
663 
664 	for (;;) {
665 		la = *pos;
666 		ac = mdoc_zargs(mdoc, line, pos, buf, &p);
667 
668 		if (ARGS_ERROR == ac)
669 			return(0);
670 		else if (ARGS_EOLN == ac)
671 			break;
672 
673 		dword(mdoc, line, la, p, DELIM_MAX, 1);
674 
675 		/*
676 		 * If we encounter end-of-sentence symbols, then trigger
677 		 * the double-space.
678 		 *
679 		 * XXX: it's easy to allow this to propagate outward to
680 		 * the last symbol, such that `. )' will cause the
681 		 * correct double-spacing.  However, (1) groff isn't
682 		 * smart enough to do this and (2) it would require
683 		 * knowing which symbols break this behaviour, for
684 		 * example, `.  ;' shouldn't propagate the double-space.
685 		 */
686 		if (mandoc_eos(p, strlen(p), 0))
687 			mdoc->last->flags |= MDOC_EOS;
688 	}
689 
690 	return(1);
691 }
692 
693 
694 /*
695  * Close out block partial/full explicit.
696  */
697 static int
698 blk_exp_close(MACRO_PROT_ARGS)
699 {
700 	struct mdoc_node *body;		/* Our own body. */
701 	struct mdoc_node *later;	/* A sub-block starting later. */
702 	struct mdoc_node *n;		/* For searching backwards. */
703 
704 	int	 	 j, lastarg, maxargs, flushed, nl;
705 	enum margserr	 ac;
706 	enum mdoct	 atok, ntok;
707 	char		*p;
708 
709 	nl = MDOC_NEWLINE & mdoc->flags;
710 
711 	switch (tok) {
712 	case (MDOC_Ec):
713 		maxargs = 1;
714 		break;
715 	case (MDOC_Ek):
716 		mdoc->flags &= ~MDOC_KEEP;
717 	default:
718 		maxargs = 0;
719 		break;
720 	}
721 
722 	/*
723 	 * Search backwards for beginnings of blocks,
724 	 * both of our own and of pending sub-blocks.
725 	 */
726 	atok = rew_alt(tok);
727 	body = later = NULL;
728 	for (n = mdoc->last; n; n = n->parent) {
729 		if (MDOC_VALID & n->flags)
730 			continue;
731 
732 		/* Remember the start of our own body. */
733 		if (MDOC_BODY == n->type && atok == n->tok) {
734 			if (ENDBODY_NOT == n->end)
735 				body = n;
736 			continue;
737 		}
738 
739 		if (MDOC_BLOCK != n->type || MDOC_Nm == n->tok)
740 			continue;
741 		if (atok == n->tok) {
742 			assert(body);
743 
744 			/*
745 			 * Found the start of our own block.
746 			 * When there is no pending sub block,
747 			 * just proceed to closing out.
748 			 */
749 			if (NULL == later)
750 				break;
751 
752 			/*
753 			 * When there is a pending sub block,
754 			 * postpone closing out the current block
755 			 * until the rew_sub() closing out the sub-block.
756 			 */
757 			make_pending(later, tok, mdoc, line, ppos);
758 
759 			/*
760 			 * Mark the place where the formatting - but not
761 			 * the scope - of the current block ends.
762 			 */
763 			if ( ! mdoc_endbody_alloc(mdoc, line, ppos,
764 			    atok, body, ENDBODY_SPACE))
765 				return(0);
766 			break;
767 		}
768 
769 		/*
770 		 * When finding an open sub block, remember the last
771 		 * open explicit block, or, in case there are only
772 		 * implicit ones, the first open implicit block.
773 		 */
774 		if (later &&
775 		    MDOC_EXPLICIT & mdoc_macros[later->tok].flags)
776 			continue;
777 		if (MDOC_It != n->tok)
778 			later = n;
779 	}
780 
781 	if ( ! (MDOC_CALLABLE & mdoc_macros[tok].flags)) {
782 		/* FIXME: do this in validate */
783 		if (buf[*pos])
784 			mdoc_pmsg(mdoc, line, ppos, MANDOCERR_ARGSLOST);
785 
786 		if ( ! rew_sub(MDOC_BODY, mdoc, tok, line, ppos))
787 			return(0);
788 		return(rew_sub(MDOC_BLOCK, mdoc, tok, line, ppos));
789 	}
790 
791 	if ( ! rew_sub(MDOC_BODY, mdoc, tok, line, ppos))
792 		return(0);
793 
794 	if (NULL == later && maxargs > 0)
795 		if ( ! mdoc_tail_alloc(mdoc, line, ppos, rew_alt(tok)))
796 			return(0);
797 
798 	for (flushed = j = 0; ; j++) {
799 		lastarg = *pos;
800 
801 		if (j == maxargs && ! flushed) {
802 			if ( ! rew_sub(MDOC_BLOCK, mdoc, tok, line, ppos))
803 				return(0);
804 			flushed = 1;
805 		}
806 
807 		ac = mdoc_args(mdoc, line, pos, buf, tok, &p);
808 
809 		if (ARGS_ERROR == ac)
810 			return(0);
811 		if (ARGS_PUNCT == ac)
812 			break;
813 		if (ARGS_EOLN == ac)
814 			break;
815 
816 		ntok = ARGS_QWORD == ac ? MDOC_MAX : lookup(tok, p);
817 
818 		if (MDOC_MAX == ntok) {
819 			if ( ! dword(mdoc, line, lastarg, p, DELIM_MAX,
820 			    MDOC_JOIN & mdoc_macros[tok].flags))
821 				return(0);
822 			continue;
823 		}
824 
825 		if ( ! flushed) {
826 			if ( ! rew_sub(MDOC_BLOCK, mdoc, tok, line, ppos))
827 				return(0);
828 			flushed = 1;
829 		}
830 
831 		mdoc->flags &= ~MDOC_NEWLINE;
832 
833 		if ( ! mdoc_macro(mdoc, ntok, line, lastarg, pos, buf))
834 			return(0);
835 		break;
836 	}
837 
838 	if ( ! flushed && ! rew_sub(MDOC_BLOCK, mdoc, tok, line, ppos))
839 		return(0);
840 
841 	if ( ! nl)
842 		return(1);
843 	return(append_delims(mdoc, line, pos, buf));
844 }
845 
846 
847 static int
848 in_line(MACRO_PROT_ARGS)
849 {
850 	int		 la, scope, cnt, nc, nl;
851 	enum margverr	 av;
852 	enum mdoct	 ntok;
853 	enum margserr	 ac;
854 	enum mdelim	 d;
855 	struct mdoc_arg	*arg;
856 	char		*p;
857 
858 	nl = MDOC_NEWLINE & mdoc->flags;
859 
860 	/*
861 	 * Whether we allow ignored elements (those without content,
862 	 * usually because of reserved words) to squeak by.
863 	 */
864 
865 	switch (tok) {
866 	case (MDOC_An):
867 		/* FALLTHROUGH */
868 	case (MDOC_Ar):
869 		/* FALLTHROUGH */
870 	case (MDOC_Fl):
871 		/* FALLTHROUGH */
872 	case (MDOC_Mt):
873 		/* FALLTHROUGH */
874 	case (MDOC_Nm):
875 		/* FALLTHROUGH */
876 	case (MDOC_Pa):
877 		nc = 1;
878 		break;
879 	default:
880 		nc = 0;
881 		break;
882 	}
883 
884 	for (arg = NULL;; ) {
885 		la = *pos;
886 		av = mdoc_argv(mdoc, line, tok, &arg, pos, buf);
887 
888 		if (ARGV_WORD == av) {
889 			*pos = la;
890 			break;
891 		}
892 		if (ARGV_EOLN == av)
893 			break;
894 		if (ARGV_ARG == av)
895 			continue;
896 
897 		mdoc_argv_free(arg);
898 		return(0);
899 	}
900 
901 	for (cnt = scope = 0;; ) {
902 		la = *pos;
903 		ac = mdoc_args(mdoc, line, pos, buf, tok, &p);
904 
905 		if (ARGS_ERROR == ac)
906 			return(0);
907 		if (ARGS_EOLN == ac)
908 			break;
909 		if (ARGS_PUNCT == ac)
910 			break;
911 
912 		ntok = ARGS_QWORD == ac ? MDOC_MAX : lookup(tok, p);
913 
914 		/*
915 		 * In this case, we've located a submacro and must
916 		 * execute it.  Close out scope, if open.  If no
917 		 * elements have been generated, either create one (nc)
918 		 * or raise a warning.
919 		 */
920 
921 		if (MDOC_MAX != ntok) {
922 			if (scope && ! rew_elem(mdoc, tok))
923 				return(0);
924 			if (nc && 0 == cnt) {
925 				if ( ! mdoc_elem_alloc(mdoc, line,
926 						ppos, tok, arg))
927 					return(0);
928 				if ( ! rew_last(mdoc, mdoc->last))
929 					return(0);
930 			} else if ( ! nc && 0 == cnt) {
931 				mdoc_argv_free(arg);
932 				mdoc_pmsg(mdoc, line, ppos,
933 					MANDOCERR_MACROEMPTY);
934 			}
935 
936 			if ( ! mdoc_macro(mdoc, ntok, line, la, pos, buf))
937 				return(0);
938 			if ( ! nl)
939 				return(1);
940 			return(append_delims(mdoc, line, pos, buf));
941 		}
942 
943 		/*
944 		 * Non-quote-enclosed punctuation.  Set up our scope, if
945 		 * a word; rewind the scope, if a delimiter; then append
946 		 * the word.
947 		 */
948 
949 		d = ARGS_QWORD == ac ? DELIM_NONE : mdoc_isdelim(p);
950 
951 		if (DELIM_NONE != d) {
952 			/*
953 			 * If we encounter closing punctuation, no word
954 			 * has been omitted, no scope is open, and we're
955 			 * allowed to have an empty element, then start
956 			 * a new scope.  `Ar', `Fl', and `Li', only do
957 			 * this once per invocation.  There may be more
958 			 * of these (all of them?).
959 			 */
960 			if (0 == cnt && (nc || MDOC_Li == tok) &&
961 					DELIM_CLOSE == d && ! scope) {
962 				if ( ! mdoc_elem_alloc(mdoc, line,
963 						ppos, tok, arg))
964 					return(0);
965 				if (MDOC_Ar == tok || MDOC_Li == tok ||
966 						MDOC_Fl == tok)
967 					cnt++;
968 				scope = 1;
969 			}
970 			/*
971 			 * Close out our scope, if one is open, before
972 			 * any punctuation.
973 			 */
974 			if (scope && ! rew_elem(mdoc, tok))
975 				return(0);
976 			scope = 0;
977 		} else if ( ! scope) {
978 			if ( ! mdoc_elem_alloc(mdoc, line, ppos, tok, arg))
979 				return(0);
980 			scope = 1;
981 		}
982 
983 		if (DELIM_NONE == d)
984 			cnt++;
985 
986 		if ( ! dword(mdoc, line, la, p, d,
987 		    MDOC_JOIN & mdoc_macros[tok].flags))
988 			return(0);
989 
990 		/*
991 		 * `Fl' macros have their scope re-opened with each new
992 		 * word so that the `-' can be added to each one without
993 		 * having to parse out spaces.
994 		 */
995 		if (scope && MDOC_Fl == tok) {
996 			if ( ! rew_elem(mdoc, tok))
997 				return(0);
998 			scope = 0;
999 		}
1000 	}
1001 
1002 	if (scope && ! rew_elem(mdoc, tok))
1003 		return(0);
1004 
1005 	/*
1006 	 * If no elements have been collected and we're allowed to have
1007 	 * empties (nc), open a scope and close it out.  Otherwise,
1008 	 * raise a warning.
1009 	 */
1010 
1011 	if (nc && 0 == cnt) {
1012 		if ( ! mdoc_elem_alloc(mdoc, line, ppos, tok, arg))
1013 			return(0);
1014 		if ( ! rew_last(mdoc, mdoc->last))
1015 			return(0);
1016 	} else if ( ! nc && 0 == cnt) {
1017 		mdoc_argv_free(arg);
1018 		mdoc_pmsg(mdoc, line, ppos, MANDOCERR_MACROEMPTY);
1019 	}
1020 
1021 	if ( ! nl)
1022 		return(1);
1023 	return(append_delims(mdoc, line, pos, buf));
1024 }
1025 
1026 
1027 static int
1028 blk_full(MACRO_PROT_ARGS)
1029 {
1030 	int		  la, nl, nparsed;
1031 	struct mdoc_arg	 *arg;
1032 	struct mdoc_node *head; /* save of head macro */
1033 	struct mdoc_node *body; /* save of body macro */
1034 	struct mdoc_node *n;
1035 	enum mdoc_type	  mtt;
1036 	enum mdoct	  ntok;
1037 	enum margserr	  ac, lac;
1038 	enum margverr	  av;
1039 	char		 *p;
1040 
1041 	nl = MDOC_NEWLINE & mdoc->flags;
1042 
1043 	/* Close out prior implicit scope. */
1044 
1045 	if ( ! (MDOC_EXPLICIT & mdoc_macros[tok].flags)) {
1046 		if ( ! rew_sub(MDOC_BODY, mdoc, tok, line, ppos))
1047 			return(0);
1048 		if ( ! rew_sub(MDOC_BLOCK, mdoc, tok, line, ppos))
1049 			return(0);
1050 	}
1051 
1052 	/*
1053 	 * This routine accommodates implicitly- and explicitly-scoped
1054 	 * macro openings.  Implicit ones first close out prior scope
1055 	 * (seen above).  Delay opening the head until necessary to
1056 	 * allow leading punctuation to print.  Special consideration
1057 	 * for `It -column', which has phrase-part syntax instead of
1058 	 * regular child nodes.
1059 	 */
1060 
1061 	for (arg = NULL;; ) {
1062 		la = *pos;
1063 		av = mdoc_argv(mdoc, line, tok, &arg, pos, buf);
1064 
1065 		if (ARGV_WORD == av) {
1066 			*pos = la;
1067 			break;
1068 		}
1069 
1070 		if (ARGV_EOLN == av)
1071 			break;
1072 		if (ARGV_ARG == av)
1073 			continue;
1074 
1075 		mdoc_argv_free(arg);
1076 		return(0);
1077 	}
1078 
1079 	if ( ! mdoc_block_alloc(mdoc, line, ppos, tok, arg))
1080 		return(0);
1081 
1082 	head = body = NULL;
1083 
1084 	/*
1085 	 * Exception: Heads of `It' macros in `-diag' lists are not
1086 	 * parsed, even though `It' macros in general are parsed.
1087 	 */
1088 	nparsed = MDOC_It == tok &&
1089 		MDOC_Bl == mdoc->last->parent->tok &&
1090 		LIST_diag == mdoc->last->parent->norm->Bl.type;
1091 
1092 	/*
1093 	 * The `Nd' macro has all arguments in its body: it's a hybrid
1094 	 * of block partial-explicit and full-implicit.  Stupid.
1095 	 */
1096 
1097 	if (MDOC_Nd == tok) {
1098 		if ( ! mdoc_head_alloc(mdoc, line, ppos, tok))
1099 			return(0);
1100 		head = mdoc->last;
1101 		if ( ! rew_sub(MDOC_HEAD, mdoc, tok, line, ppos))
1102 			return(0);
1103 		if ( ! mdoc_body_alloc(mdoc, line, ppos, tok))
1104 			return(0);
1105 		body = mdoc->last;
1106 	}
1107 
1108 	if (MDOC_Bk == tok)
1109 		mdoc->flags |= MDOC_KEEP;
1110 
1111 	ac = ARGS_ERROR;
1112 
1113 	for ( ; ; ) {
1114 		la = *pos;
1115 		/* Initialise last-phrase-type with ARGS_PEND. */
1116 		lac = ARGS_ERROR == ac ? ARGS_PEND : ac;
1117 		ac = mdoc_args(mdoc, line, pos, buf, tok, &p);
1118 
1119 		if (ARGS_PUNCT == ac)
1120 			break;
1121 
1122 		if (ARGS_ERROR == ac)
1123 			return(0);
1124 
1125 		if (ARGS_EOLN == ac) {
1126 			if (ARGS_PPHRASE != lac && ARGS_PHRASE != lac)
1127 				break;
1128 			/*
1129 			 * This is necessary: if the last token on a
1130 			 * line is a `Ta' or tab, then we'll get
1131 			 * ARGS_EOLN, so we must be smart enough to
1132 			 * reopen our scope if the last parse was a
1133 			 * phrase or partial phrase.
1134 			 */
1135 			if ( ! rew_sub(MDOC_BODY, mdoc, tok, line, ppos))
1136 				return(0);
1137 			if ( ! mdoc_body_alloc(mdoc, line, ppos, tok))
1138 				return(0);
1139 			body = mdoc->last;
1140 			break;
1141 		}
1142 
1143 		/*
1144 		 * Emit leading punctuation (i.e., punctuation before
1145 		 * the MDOC_HEAD) for non-phrase types.
1146 		 */
1147 
1148 		if (NULL == head &&
1149 				ARGS_PEND != ac &&
1150 				ARGS_PHRASE != ac &&
1151 				ARGS_PPHRASE != ac &&
1152 				ARGS_QWORD != ac &&
1153 				DELIM_OPEN == mdoc_isdelim(p)) {
1154 			if ( ! dword(mdoc, line, la, p, DELIM_OPEN, 0))
1155 				return(0);
1156 			continue;
1157 		}
1158 
1159 		/* Open a head if one hasn't been opened. */
1160 
1161 		if (NULL == head) {
1162 			if ( ! mdoc_head_alloc(mdoc, line, ppos, tok))
1163 				return(0);
1164 			head = mdoc->last;
1165 		}
1166 
1167 		if (ARGS_PHRASE == ac ||
1168 				ARGS_PEND == ac ||
1169 				ARGS_PPHRASE == ac) {
1170 			/*
1171 			 * If we haven't opened a body yet, rewind the
1172 			 * head; if we have, rewind that instead.
1173 			 */
1174 
1175 			mtt = body ? MDOC_BODY : MDOC_HEAD;
1176 			if ( ! rew_sub(mtt, mdoc, tok, line, ppos))
1177 				return(0);
1178 
1179 			/* Then allocate our body context. */
1180 
1181 			if ( ! mdoc_body_alloc(mdoc, line, ppos, tok))
1182 				return(0);
1183 			body = mdoc->last;
1184 
1185 			/*
1186 			 * Process phrases: set whether we're in a
1187 			 * partial-phrase (this effects line handling)
1188 			 * then call down into the phrase parser.
1189 			 */
1190 
1191 			if (ARGS_PPHRASE == ac)
1192 				mdoc->flags |= MDOC_PPHRASE;
1193 			if (ARGS_PEND == ac && ARGS_PPHRASE == lac)
1194 				mdoc->flags |= MDOC_PPHRASE;
1195 
1196 			if ( ! phrase(mdoc, line, la, buf))
1197 				return(0);
1198 
1199 			mdoc->flags &= ~MDOC_PPHRASE;
1200 			continue;
1201 		}
1202 
1203 		ntok = nparsed || ARGS_QWORD == ac ?
1204 			MDOC_MAX : lookup(tok, p);
1205 
1206 		if (MDOC_MAX == ntok) {
1207 			if ( ! dword(mdoc, line, la, p, DELIM_MAX,
1208 			    MDOC_JOIN & mdoc_macros[tok].flags))
1209 				return(0);
1210 			continue;
1211 		}
1212 
1213 		if ( ! mdoc_macro(mdoc, ntok, line, la, pos, buf))
1214 			return(0);
1215 		break;
1216 	}
1217 
1218 	if (NULL == head) {
1219 		if ( ! mdoc_head_alloc(mdoc, line, ppos, tok))
1220 			return(0);
1221 		head = mdoc->last;
1222 	}
1223 
1224 	if (nl && ! append_delims(mdoc, line, pos, buf))
1225 		return(0);
1226 
1227 	/* If we've already opened our body, exit now. */
1228 
1229 	if (NULL != body)
1230 		goto out;
1231 
1232 	/*
1233 	 * If there is an open (i.e., unvalidated) sub-block requiring
1234 	 * explicit close-out, postpone switching the current block from
1235 	 * head to body until the rew_sub() call closing out that
1236 	 * sub-block.
1237 	 */
1238 	for (n = mdoc->last; n && n != head; n = n->parent) {
1239 		if (MDOC_BLOCK == n->type &&
1240 				MDOC_EXPLICIT & mdoc_macros[n->tok].flags &&
1241 				! (MDOC_VALID & n->flags)) {
1242 			n->pending = head;
1243 			return(1);
1244 		}
1245 	}
1246 
1247 	/* Close out scopes to remain in a consistent state. */
1248 
1249 	if ( ! rew_sub(MDOC_HEAD, mdoc, tok, line, ppos))
1250 		return(0);
1251 	if ( ! mdoc_body_alloc(mdoc, line, ppos, tok))
1252 		return(0);
1253 
1254 out:
1255 	if ( ! (MDOC_FREECOL & mdoc->flags))
1256 		return(1);
1257 
1258 	if ( ! rew_sub(MDOC_BODY, mdoc, tok, line, ppos))
1259 		return(0);
1260 	if ( ! rew_sub(MDOC_BLOCK, mdoc, tok, line, ppos))
1261 		return(0);
1262 
1263 	mdoc->flags &= ~MDOC_FREECOL;
1264 	return(1);
1265 }
1266 
1267 
1268 static int
1269 blk_part_imp(MACRO_PROT_ARGS)
1270 {
1271 	int		  la, nl;
1272 	enum mdoct	  ntok;
1273 	enum margserr	  ac;
1274 	char		 *p;
1275 	struct mdoc_node *blk; /* saved block context */
1276 	struct mdoc_node *body; /* saved body context */
1277 	struct mdoc_node *n;
1278 
1279 	nl = MDOC_NEWLINE & mdoc->flags;
1280 
1281 	/*
1282 	 * A macro that spans to the end of the line.  This is generally
1283 	 * (but not necessarily) called as the first macro.  The block
1284 	 * has a head as the immediate child, which is always empty,
1285 	 * followed by zero or more opening punctuation nodes, then the
1286 	 * body (which may be empty, depending on the macro), then zero
1287 	 * or more closing punctuation nodes.
1288 	 */
1289 
1290 	if ( ! mdoc_block_alloc(mdoc, line, ppos, tok, NULL))
1291 		return(0);
1292 
1293 	blk = mdoc->last;
1294 
1295 	if ( ! mdoc_head_alloc(mdoc, line, ppos, tok))
1296 		return(0);
1297 	if ( ! rew_sub(MDOC_HEAD, mdoc, tok, line, ppos))
1298 		return(0);
1299 
1300 	/*
1301 	 * Open the body scope "on-demand", that is, after we've
1302 	 * processed all our the leading delimiters (open parenthesis,
1303 	 * etc.).
1304 	 */
1305 
1306 	for (body = NULL; ; ) {
1307 		la = *pos;
1308 		ac = mdoc_args(mdoc, line, pos, buf, tok, &p);
1309 
1310 		if (ARGS_ERROR == ac)
1311 			return(0);
1312 		if (ARGS_EOLN == ac)
1313 			break;
1314 		if (ARGS_PUNCT == ac)
1315 			break;
1316 
1317 		if (NULL == body && ARGS_QWORD != ac &&
1318 				DELIM_OPEN == mdoc_isdelim(p)) {
1319 			if ( ! dword(mdoc, line, la, p, DELIM_OPEN, 0))
1320 				return(0);
1321 			continue;
1322 		}
1323 
1324 		if (NULL == body) {
1325 		       if ( ! mdoc_body_alloc(mdoc, line, ppos, tok))
1326 			       return(0);
1327 			body = mdoc->last;
1328 		}
1329 
1330 		ntok = ARGS_QWORD == ac ? MDOC_MAX : lookup(tok, p);
1331 
1332 		if (MDOC_MAX == ntok) {
1333 			if ( ! dword(mdoc, line, la, p, DELIM_MAX,
1334 			    MDOC_JOIN & mdoc_macros[tok].flags))
1335 				return(0);
1336 			continue;
1337 		}
1338 
1339 		if ( ! mdoc_macro(mdoc, ntok, line, la, pos, buf))
1340 			return(0);
1341 		break;
1342 	}
1343 
1344 	/* Clean-ups to leave in a consistent state. */
1345 
1346 	if (NULL == body) {
1347 		if ( ! mdoc_body_alloc(mdoc, line, ppos, tok))
1348 			return(0);
1349 		body = mdoc->last;
1350 	}
1351 
1352 	for (n = body->child; n && n->next; n = n->next)
1353 		/* Do nothing. */ ;
1354 
1355 	/*
1356 	 * End of sentence spacing: if the last node is a text node and
1357 	 * has a trailing period, then mark it as being end-of-sentence.
1358 	 */
1359 
1360 	if (n && MDOC_TEXT == n->type && n->string)
1361 		if (mandoc_eos(n->string, strlen(n->string), 1))
1362 			n->flags |= MDOC_EOS;
1363 
1364 	/* Up-propagate the end-of-space flag. */
1365 
1366 	if (n && (MDOC_EOS & n->flags)) {
1367 		body->flags |= MDOC_EOS;
1368 		body->parent->flags |= MDOC_EOS;
1369 	}
1370 
1371 	/*
1372 	 * If there is an open sub-block requiring explicit close-out,
1373 	 * postpone closing out the current block
1374 	 * until the rew_sub() call closing out the sub-block.
1375 	 */
1376 	for (n = mdoc->last; n && n != body && n != blk->parent;
1377 			n = n->parent) {
1378 		if (MDOC_BLOCK == n->type &&
1379 		    MDOC_EXPLICIT & mdoc_macros[n->tok].flags &&
1380 		    ! (MDOC_VALID & n->flags)) {
1381 			make_pending(n, tok, mdoc, line, ppos);
1382 			if ( ! mdoc_endbody_alloc(mdoc, line, ppos,
1383 			    tok, body, ENDBODY_NOSPACE))
1384 				return(0);
1385 			return(1);
1386 		}
1387 	}
1388 
1389 	/*
1390 	 * If we can't rewind to our body, then our scope has already
1391 	 * been closed by another macro (like `Oc' closing `Op').  This
1392 	 * is ugly behaviour nodding its head to OpenBSD's overwhelming
1393 	 * crufty use of `Op' breakage.
1394 	 */
1395 	if (n != body)
1396 		mandoc_vmsg(MANDOCERR_SCOPENEST, mdoc->parse, line, ppos,
1397 				"%s broken", mdoc_macronames[tok]);
1398 
1399 	if (n && ! rew_sub(MDOC_BODY, mdoc, tok, line, ppos))
1400 		return(0);
1401 
1402 	/* Standard appending of delimiters. */
1403 
1404 	if (nl && ! append_delims(mdoc, line, pos, buf))
1405 		return(0);
1406 
1407 	/* Rewind scope, if applicable. */
1408 
1409 	if (n && ! rew_sub(MDOC_BLOCK, mdoc, tok, line, ppos))
1410 		return(0);
1411 
1412 	/* Move trailing .Ns out of scope. */
1413 
1414 	for (n = body->child; n && n->next; n = n->next)
1415 		/* Do nothing. */ ;
1416 	if (n && MDOC_Ns == n->tok)
1417 		mdoc_node_relink(mdoc, n);
1418 
1419 	return(1);
1420 }
1421 
1422 
1423 static int
1424 blk_part_exp(MACRO_PROT_ARGS)
1425 {
1426 	int		  la, nl;
1427 	enum margserr	  ac;
1428 	struct mdoc_node *head; /* keep track of head */
1429 	struct mdoc_node *body; /* keep track of body */
1430 	char		 *p;
1431 	enum mdoct	  ntok;
1432 
1433 	nl = MDOC_NEWLINE & mdoc->flags;
1434 
1435 	/*
1436 	 * The opening of an explicit macro having zero or more leading
1437 	 * punctuation nodes; a head with optional single element (the
1438 	 * case of `Eo'); and a body that may be empty.
1439 	 */
1440 
1441 	if ( ! mdoc_block_alloc(mdoc, line, ppos, tok, NULL))
1442 		return(0);
1443 
1444 	for (head = body = NULL; ; ) {
1445 		la = *pos;
1446 		ac = mdoc_args(mdoc, line, pos, buf, tok, &p);
1447 
1448 		if (ARGS_ERROR == ac)
1449 			return(0);
1450 		if (ARGS_PUNCT == ac)
1451 			break;
1452 		if (ARGS_EOLN == ac)
1453 			break;
1454 
1455 		/* Flush out leading punctuation. */
1456 
1457 		if (NULL == head && ARGS_QWORD != ac &&
1458 				DELIM_OPEN == mdoc_isdelim(p)) {
1459 			assert(NULL == body);
1460 			if ( ! dword(mdoc, line, la, p, DELIM_OPEN, 0))
1461 				return(0);
1462 			continue;
1463 		}
1464 
1465 		if (NULL == head) {
1466 			assert(NULL == body);
1467 			if ( ! mdoc_head_alloc(mdoc, line, ppos, tok))
1468 				return(0);
1469 			head = mdoc->last;
1470 		}
1471 
1472 		/*
1473 		 * `Eo' gobbles any data into the head, but most other
1474 		 * macros just immediately close out and begin the body.
1475 		 */
1476 
1477 		if (NULL == body) {
1478 			assert(head);
1479 			/* No check whether it's a macro! */
1480 			if (MDOC_Eo == tok)
1481 				if ( ! dword(mdoc, line, la, p, DELIM_MAX, 0))
1482 					return(0);
1483 
1484 			if ( ! rew_sub(MDOC_HEAD, mdoc, tok, line, ppos))
1485 				return(0);
1486 			if ( ! mdoc_body_alloc(mdoc, line, ppos, tok))
1487 				return(0);
1488 			body = mdoc->last;
1489 
1490 			if (MDOC_Eo == tok)
1491 				continue;
1492 		}
1493 
1494 		assert(NULL != head && NULL != body);
1495 
1496 		ntok = ARGS_QWORD == ac ? MDOC_MAX : lookup(tok, p);
1497 
1498 		if (MDOC_MAX == ntok) {
1499 			if ( ! dword(mdoc, line, la, p, DELIM_MAX,
1500 			    MDOC_JOIN & mdoc_macros[tok].flags))
1501 				return(0);
1502 			continue;
1503 		}
1504 
1505 		if ( ! mdoc_macro(mdoc, ntok, line, la, pos, buf))
1506 			return(0);
1507 		break;
1508 	}
1509 
1510 	/* Clean-up to leave in a consistent state. */
1511 
1512 	if (NULL == head)
1513 		if ( ! mdoc_head_alloc(mdoc, line, ppos, tok))
1514 			return(0);
1515 
1516 	if (NULL == body) {
1517 		if ( ! rew_sub(MDOC_HEAD, mdoc, tok, line, ppos))
1518 			return(0);
1519 		if ( ! mdoc_body_alloc(mdoc, line, ppos, tok))
1520 			return(0);
1521 	}
1522 
1523 	/* Standard appending of delimiters. */
1524 
1525 	if ( ! nl)
1526 		return(1);
1527 	return(append_delims(mdoc, line, pos, buf));
1528 }
1529 
1530 
1531 /* ARGSUSED */
1532 static int
1533 in_line_argn(MACRO_PROT_ARGS)
1534 {
1535 	int		 la, flushed, j, maxargs, nl;
1536 	enum margserr	 ac;
1537 	enum margverr	 av;
1538 	struct mdoc_arg	*arg;
1539 	char		*p;
1540 	enum mdoct	 ntok;
1541 
1542 	nl = MDOC_NEWLINE & mdoc->flags;
1543 
1544 	/*
1545 	 * A line macro that has a fixed number of arguments (maxargs).
1546 	 * Only open the scope once the first non-leading-punctuation is
1547 	 * found (unless MDOC_IGNDELIM is noted, like in `Pf'), then
1548 	 * keep it open until the maximum number of arguments are
1549 	 * exhausted.
1550 	 */
1551 
1552 	switch (tok) {
1553 	case (MDOC_Ap):
1554 		/* FALLTHROUGH */
1555 	case (MDOC_No):
1556 		/* FALLTHROUGH */
1557 	case (MDOC_Ns):
1558 		/* FALLTHROUGH */
1559 	case (MDOC_Ux):
1560 		maxargs = 0;
1561 		break;
1562 	case (MDOC_Bx):
1563 		/* FALLTHROUGH */
1564 	case (MDOC_Xr):
1565 		maxargs = 2;
1566 		break;
1567 	default:
1568 		maxargs = 1;
1569 		break;
1570 	}
1571 
1572 	for (arg = NULL; ; ) {
1573 		la = *pos;
1574 		av = mdoc_argv(mdoc, line, tok, &arg, pos, buf);
1575 
1576 		if (ARGV_WORD == av) {
1577 			*pos = la;
1578 			break;
1579 		}
1580 
1581 		if (ARGV_EOLN == av)
1582 			break;
1583 		if (ARGV_ARG == av)
1584 			continue;
1585 
1586 		mdoc_argv_free(arg);
1587 		return(0);
1588 	}
1589 
1590 	for (flushed = j = 0; ; ) {
1591 		la = *pos;
1592 		ac = mdoc_args(mdoc, line, pos, buf, tok, &p);
1593 
1594 		if (ARGS_ERROR == ac)
1595 			return(0);
1596 		if (ARGS_PUNCT == ac)
1597 			break;
1598 		if (ARGS_EOLN == ac)
1599 			break;
1600 
1601 		if ( ! (MDOC_IGNDELIM & mdoc_macros[tok].flags) &&
1602 				ARGS_QWORD != ac && 0 == j &&
1603 				DELIM_OPEN == mdoc_isdelim(p)) {
1604 			if ( ! dword(mdoc, line, la, p, DELIM_OPEN, 0))
1605 				return(0);
1606 			continue;
1607 		} else if (0 == j)
1608 		       if ( ! mdoc_elem_alloc(mdoc, line, la, tok, arg))
1609 			       return(0);
1610 
1611 		if (j == maxargs && ! flushed) {
1612 			if ( ! rew_elem(mdoc, tok))
1613 				return(0);
1614 			flushed = 1;
1615 		}
1616 
1617 		ntok = ARGS_QWORD == ac ? MDOC_MAX : lookup(tok, p);
1618 
1619 		if (MDOC_MAX != ntok) {
1620 			if ( ! flushed && ! rew_elem(mdoc, tok))
1621 				return(0);
1622 			flushed = 1;
1623 			if ( ! mdoc_macro(mdoc, ntok, line, la, pos, buf))
1624 				return(0);
1625 			j++;
1626 			break;
1627 		}
1628 
1629 		if ( ! (MDOC_IGNDELIM & mdoc_macros[tok].flags) &&
1630 				ARGS_QWORD != ac &&
1631 				! flushed &&
1632 				DELIM_NONE != mdoc_isdelim(p)) {
1633 			if ( ! rew_elem(mdoc, tok))
1634 				return(0);
1635 			flushed = 1;
1636 		}
1637 
1638 		if ( ! dword(mdoc, line, la, p, DELIM_MAX,
1639 		    MDOC_JOIN & mdoc_macros[tok].flags))
1640 			return(0);
1641 		j++;
1642 	}
1643 
1644 	if (0 == j && ! mdoc_elem_alloc(mdoc, line, la, tok, arg))
1645 	       return(0);
1646 
1647 	/* Close out in a consistent state. */
1648 
1649 	if ( ! flushed && ! rew_elem(mdoc, tok))
1650 		return(0);
1651 	if ( ! nl)
1652 		return(1);
1653 	return(append_delims(mdoc, line, pos, buf));
1654 }
1655 
1656 
1657 static int
1658 in_line_eoln(MACRO_PROT_ARGS)
1659 {
1660 	int		 la;
1661 	enum margserr	 ac;
1662 	enum margverr	 av;
1663 	struct mdoc_arg	*arg;
1664 	char		*p;
1665 	enum mdoct	 ntok;
1666 
1667 	assert( ! (MDOC_PARSED & mdoc_macros[tok].flags));
1668 
1669 	if (tok == MDOC_Pp)
1670 		rew_sub(MDOC_BLOCK, mdoc, MDOC_Nm, line, ppos);
1671 
1672 	/* Parse macro arguments. */
1673 
1674 	for (arg = NULL; ; ) {
1675 		la = *pos;
1676 		av = mdoc_argv(mdoc, line, tok, &arg, pos, buf);
1677 
1678 		if (ARGV_WORD == av) {
1679 			*pos = la;
1680 			break;
1681 		}
1682 		if (ARGV_EOLN == av)
1683 			break;
1684 		if (ARGV_ARG == av)
1685 			continue;
1686 
1687 		mdoc_argv_free(arg);
1688 		return(0);
1689 	}
1690 
1691 	/* Open element scope. */
1692 
1693 	if ( ! mdoc_elem_alloc(mdoc, line, ppos, tok, arg))
1694 		return(0);
1695 
1696 	/* Parse argument terms. */
1697 
1698 	for (;;) {
1699 		la = *pos;
1700 		ac = mdoc_args(mdoc, line, pos, buf, tok, &p);
1701 
1702 		if (ARGS_ERROR == ac)
1703 			return(0);
1704 		if (ARGS_EOLN == ac)
1705 			break;
1706 
1707 		ntok = ARGS_QWORD == ac ? MDOC_MAX : lookup(tok, p);
1708 
1709 		if (MDOC_MAX == ntok) {
1710 			if ( ! dword(mdoc, line, la, p, DELIM_MAX,
1711 			    MDOC_JOIN & mdoc_macros[tok].flags))
1712 				return(0);
1713 			continue;
1714 		}
1715 
1716 		if ( ! rew_elem(mdoc, tok))
1717 			return(0);
1718 		return(mdoc_macro(mdoc, ntok, line, la, pos, buf));
1719 	}
1720 
1721 	/* Close out (no delimiters). */
1722 
1723 	return(rew_elem(mdoc, tok));
1724 }
1725 
1726 
1727 /* ARGSUSED */
1728 static int
1729 ctx_synopsis(MACRO_PROT_ARGS)
1730 {
1731 	int		 nl;
1732 
1733 	nl = MDOC_NEWLINE & mdoc->flags;
1734 
1735 	/* If we're not in the SYNOPSIS, go straight to in-line. */
1736 	if ( ! (MDOC_SYNOPSIS & mdoc->flags))
1737 		return(in_line(mdoc, tok, line, ppos, pos, buf));
1738 
1739 	/* If we're a nested call, same place. */
1740 	if ( ! nl)
1741 		return(in_line(mdoc, tok, line, ppos, pos, buf));
1742 
1743 	/*
1744 	 * XXX: this will open a block scope; however, if later we end
1745 	 * up formatting the block scope, then child nodes will inherit
1746 	 * the formatting.  Be careful.
1747 	 */
1748 	if (MDOC_Nm == tok)
1749 		return(blk_full(mdoc, tok, line, ppos, pos, buf));
1750 	assert(MDOC_Vt == tok);
1751 	return(blk_part_imp(mdoc, tok, line, ppos, pos, buf));
1752 }
1753 
1754 
1755 /* ARGSUSED */
1756 static int
1757 obsolete(MACRO_PROT_ARGS)
1758 {
1759 
1760 	mdoc_pmsg(mdoc, line, ppos, MANDOCERR_MACROOBS);
1761 	return(1);
1762 }
1763 
1764 
1765 /*
1766  * Phrases occur within `Bl -column' entries, separated by `Ta' or tabs.
1767  * They're unusual because they're basically free-form text until a
1768  * macro is encountered.
1769  */
1770 static int
1771 phrase(struct mdoc *mdoc, int line, int ppos, char *buf)
1772 {
1773 	int		 la, pos;
1774 	enum margserr	 ac;
1775 	enum mdoct	 ntok;
1776 	char		*p;
1777 
1778 	for (pos = ppos; ; ) {
1779 		la = pos;
1780 
1781 		ac = mdoc_zargs(mdoc, line, &pos, buf, &p);
1782 
1783 		if (ARGS_ERROR == ac)
1784 			return(0);
1785 		if (ARGS_EOLN == ac)
1786 			break;
1787 
1788 		ntok = ARGS_QWORD == ac ? MDOC_MAX : lookup_raw(p);
1789 
1790 		if (MDOC_MAX == ntok) {
1791 			if ( ! dword(mdoc, line, la, p, DELIM_MAX, 1))
1792 				return(0);
1793 			continue;
1794 		}
1795 
1796 		if ( ! mdoc_macro(mdoc, ntok, line, la, &pos, buf))
1797 			return(0);
1798 		return(append_delims(mdoc, line, &pos, buf));
1799 	}
1800 
1801 	return(1);
1802 }
1803 
1804 
1805 /* ARGSUSED */
1806 static int
1807 phrase_ta(MACRO_PROT_ARGS)
1808 {
1809 	struct mdoc_node *n;
1810 	int		  la;
1811 	enum mdoct	  ntok;
1812 	enum margserr	  ac;
1813 	char		 *p;
1814 
1815 	/* Make sure we are in a column list or ignore this macro. */
1816 	n = mdoc->last;
1817 	while (NULL != n && MDOC_Bl != n->tok)
1818 		n = n->parent;
1819 	if (NULL == n || LIST_column != n->norm->Bl.type) {
1820 		mdoc_pmsg(mdoc, line, ppos, MANDOCERR_STRAYTA);
1821 		return(1);
1822 	}
1823 
1824 	/* Advance to the next column. */
1825 	if ( ! rew_sub(MDOC_BODY, mdoc, MDOC_It, line, ppos))
1826 		return(0);
1827 	if ( ! mdoc_body_alloc(mdoc, line, ppos, MDOC_It))
1828 		return(0);
1829 
1830 	for (;;) {
1831 		la = *pos;
1832 		ac = mdoc_zargs(mdoc, line, pos, buf, &p);
1833 
1834 		if (ARGS_ERROR == ac)
1835 			return(0);
1836 		if (ARGS_EOLN == ac)
1837 			break;
1838 
1839 		ntok = ARGS_QWORD == ac ? MDOC_MAX : lookup_raw(p);
1840 
1841 		if (MDOC_MAX == ntok) {
1842 			if ( ! dword(mdoc, line, la, p, DELIM_MAX,
1843 			    MDOC_JOIN & mdoc_macros[tok].flags))
1844 				return(0);
1845 			continue;
1846 		}
1847 
1848 		if ( ! mdoc_macro(mdoc, ntok, line, la, pos, buf))
1849 			return(0);
1850 		return(append_delims(mdoc, line, pos, buf));
1851 	}
1852 
1853 	return(1);
1854 }
1855