text: /*	$Id: mdoc_validate.c,v 1.182 2012/03/23 05:50:25 kristaps Exp $ */
  /*
   * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   * Copyright (c) 2010, 2011 Ingo Schwarze <schwarze@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #ifndef	OSNAME
  #include <sys/utsname.h>
  #endif
  
  #include <sys/types.h>
  
  #include <assert.h>
  #include <ctype.h>
  #include <limits.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <time.h>
  
  #include "mdoc.h"
  #include "mandoc.h"
  #include "libmdoc.h"
  #include "libmandoc.h"
  
  /* FIXME: .Bl -diag can't have non-text children in HEAD. */
  
  #define	PRE_ARGS  struct mdoc *mdoc, struct mdoc_node *n
  #define	POST_ARGS struct mdoc *mdoc
  
  #define	NUMSIZ	  32
  #define	DATESIZE  32
  
  enum	check_ineq {
  	CHECK_LT,
  	CHECK_GT,
  	CHECK_EQ
  };
  
  enum	check_lvl {
  	CHECK_WARN,
  	CHECK_ERROR,
  };
  
  typedef	int	(*v_pre)(PRE_ARGS);
  typedef	int	(*v_post)(POST_ARGS);
  
  struct	valids {
  	v_pre	*pre;
  	v_post	*post;
  };
  
  static	int	 check_count(struct mdoc *, enum mdoc_type, 
  			enum check_lvl, enum check_ineq, int);
  static	int	 check_parent(PRE_ARGS, enum mdoct, enum mdoc_type);
  static	void	 check_text(struct mdoc *, int, int, char *);
  static	void	 check_argv(struct mdoc *, 
  			struct mdoc_node *, struct mdoc_argv *);
  static	void	 check_args(struct mdoc *, struct mdoc_node *);
  static	int	 concat(char *, const struct mdoc_node *, size_t);
  static	enum mdoc_sec	a2sec(const char *);
  static	size_t		macro2len(enum mdoct);
  
  static	int	 ebool(POST_ARGS);
  static	int	 berr_ge1(POST_ARGS);
  static	int	 bwarn_ge1(POST_ARGS);
  static	int	 ewarn_eq0(POST_ARGS);
  static	int	 ewarn_eq1(POST_ARGS);
  static	int	 ewarn_ge1(POST_ARGS);
  static	int	 ewarn_le1(POST_ARGS);
  static	int	 hwarn_eq0(POST_ARGS);
  static	int	 hwarn_eq1(POST_ARGS);
  static	int	 hwarn_ge1(POST_ARGS);
  static	int	 hwarn_le1(POST_ARGS);
  
  static	int	 post_an(POST_ARGS);
  static	int	 post_at(POST_ARGS);
  static	int	 post_bf(POST_ARGS);
  static	int	 post_bl(POST_ARGS);
  static	int	 post_bl_block(POST_ARGS);
  static	int	 post_bl_block_width(POST_ARGS);
  static	int	 post_bl_block_tag(POST_ARGS);
  static	int	 post_bl_head(POST_ARGS);
  static	int	 post_bx(POST_ARGS);
  static	int	 post_dd(POST_ARGS);
  static	int	 post_dt(POST_ARGS);
  static	int	 post_defaults(POST_ARGS);
  static	int	 post_literal(POST_ARGS);
  static	int	 post_eoln(POST_ARGS);
  static	int	 post_it(POST_ARGS);
  static	int	 post_lb(POST_ARGS);
  static	int	 post_nm(POST_ARGS);
  static	int	 post_ns(POST_ARGS);
  static	int	 post_os(POST_ARGS);
  static	int	 post_ignpar(POST_ARGS);
  static	int	 post_prol(POST_ARGS);
  static	int	 post_root(POST_ARGS);
  static	int	 post_rs(POST_ARGS);
  static	int	 post_sh(POST_ARGS);
  static	int	 post_sh_body(POST_ARGS);
  static	int	 post_sh_head(POST_ARGS);
  static	int	 post_st(POST_ARGS);
  static	int	 post_std(POST_ARGS);
  static	int	 post_vt(POST_ARGS);
  static	int	 pre_an(PRE_ARGS);
  static	int	 pre_bd(PRE_ARGS);
  static	int	 pre_bl(PRE_ARGS);
  static	int	 pre_dd(PRE_ARGS);
  static	int	 pre_display(PRE_ARGS);
  static	int	 pre_dt(PRE_ARGS);
  static	int	 pre_it(PRE_ARGS);
  static	int	 pre_literal(PRE_ARGS);
  static	int	 pre_os(PRE_ARGS);
  static	int	 pre_par(PRE_ARGS);
  static	int	 pre_sh(PRE_ARGS);
  static	int	 pre_ss(PRE_ARGS);
  static	int	 pre_std(PRE_ARGS);
  
  static	v_post	 posts_an[] = { post_an, NULL };
  static	v_post	 posts_at[] = { post_at, post_defaults, NULL };
  static	v_post	 posts_bd[] = { post_literal, hwarn_eq0, bwarn_ge1, NULL };
  static	v_post	 posts_bf[] = { hwarn_le1, post_bf, NULL };
  static	v_post	 posts_bk[] = { hwarn_eq0, bwarn_ge1, NULL };
  static	v_post	 posts_bl[] = { bwarn_ge1, post_bl, NULL };
  static	v_post	 posts_bx[] = { post_bx, NULL };
  static	v_post	 posts_bool[] = { ebool, NULL };
  static	v_post	 posts_eoln[] = { post_eoln, NULL };
  static	v_post	 posts_defaults[] = { post_defaults, NULL };
  static	v_post	 posts_dd[] = { post_dd, post_prol, NULL };
  static	v_post	 posts_dl[] = { post_literal, bwarn_ge1, NULL };
  static	v_post	 posts_dt[] = { post_dt, post_prol, NULL };
  static	v_post	 posts_fo[] = { hwarn_eq1, bwarn_ge1, NULL };
  static	v_post	 posts_it[] = { post_it, NULL };
  static	v_post	 posts_lb[] = { post_lb, NULL };
  static	v_post	 posts_nd[] = { berr_ge1, NULL };
  static	v_post	 posts_nm[] = { post_nm, NULL };
  static	v_post	 posts_notext[] = { ewarn_eq0, NULL };
  static	v_post	 posts_ns[] = { post_ns, NULL };
  static	v_post	 posts_os[] = { post_os, post_prol, NULL };
  static	v_post	 posts_rs[] = { post_rs, NULL };
  static	v_post	 posts_sh[] = { post_ignpar, hwarn_ge1, post_sh, NULL };
  static	v_post	 posts_sp[] = { ewarn_le1, NULL };
  static	v_post	 posts_ss[] = { post_ignpar, hwarn_ge1, NULL };
  static	v_post	 posts_st[] = { post_st, NULL };
  static	v_post	 posts_std[] = { post_std, NULL };
  static	v_post	 posts_text[] = { ewarn_ge1, NULL };
  static	v_post	 posts_text1[] = { ewarn_eq1, NULL };
  static	v_post	 posts_vt[] = { post_vt, NULL };
  static	v_post	 posts_wline[] = { bwarn_ge1, NULL };
  static	v_pre	 pres_an[] = { pre_an, NULL };
  static	v_pre	 pres_bd[] = { pre_display, pre_bd, pre_literal, pre_par, NULL };
  static	v_pre	 pres_bl[] = { pre_bl, pre_par, NULL };
  static	v_pre	 pres_d1[] = { pre_display, NULL };
  static	v_pre	 pres_dl[] = { pre_literal, pre_display, NULL };
  static	v_pre	 pres_dd[] = { pre_dd, NULL };
  static	v_pre	 pres_dt[] = { pre_dt, NULL };
  static	v_pre	 pres_er[] = { NULL, NULL };
  static	v_pre	 pres_fd[] = { NULL, NULL };
  static	v_pre	 pres_it[] = { pre_it, pre_par, NULL };
  static	v_pre	 pres_os[] = { pre_os, NULL };
  static	v_pre	 pres_pp[] = { pre_par, NULL };
  static	v_pre	 pres_sh[] = { pre_sh, NULL };
  static	v_pre	 pres_ss[] = { pre_ss, NULL };
  static	v_pre	 pres_std[] = { pre_std, NULL };
  
  static	const struct valids mdoc_valids[MDOC_MAX] = {
  	{ NULL, NULL },				/* Ap */
  	{ pres_dd, posts_dd },			/* Dd */
  	{ pres_dt, posts_dt },			/* Dt */
  	{ pres_os, posts_os },			/* Os */
  	{ pres_sh, posts_sh },			/* Sh */ 
  	{ pres_ss, posts_ss },			/* Ss */ 
  	{ pres_pp, posts_notext },		/* Pp */ 
  	{ pres_d1, posts_wline },		/* D1 */
  	{ pres_dl, posts_dl },			/* Dl */
  	{ pres_bd, posts_bd },			/* Bd */
  	{ NULL, NULL },				/* Ed */
  	{ pres_bl, posts_bl },			/* Bl */ 
  	{ NULL, NULL },				/* El */
  	{ pres_it, posts_it },			/* It */
  	{ NULL, NULL },				/* Ad */ 
  	{ pres_an, posts_an },			/* An */ 
  	{ NULL, posts_defaults },		/* Ar */
  	{ NULL, NULL },				/* Cd */ 
  	{ NULL, NULL },				/* Cm */
  	{ NULL, NULL },				/* Dv */ 
  	{ pres_er, NULL },			/* Er */ 
  	{ NULL, NULL },				/* Ev */ 
  	{ pres_std, posts_std },		/* Ex */ 
  	{ NULL, NULL },				/* Fa */ 
  	{ pres_fd, posts_text },		/* Fd */
  	{ NULL, NULL },				/* Fl */
  	{ NULL, NULL },				/* Fn */ 
  	{ NULL, NULL },				/* Ft */ 
  	{ NULL, NULL },				/* Ic */ 
  	{ NULL, posts_text1 },			/* In */ 
  	{ NULL, posts_defaults },		/* Li */
  	{ NULL, posts_nd },			/* Nd */
  	{ NULL, posts_nm },			/* Nm */
  	{ NULL, NULL },				/* Op */
  	{ NULL, NULL },				/* Ot */
  	{ NULL, posts_defaults },		/* Pa */
  	{ pres_std, posts_std },		/* Rv */
  	{ NULL, posts_st },			/* St */ 
  	{ NULL, NULL },				/* Va */
  	{ NULL, posts_vt },			/* Vt */ 
  	{ NULL, posts_text },			/* Xr */ 
  	{ NULL, posts_text },			/* %A */
  	{ NULL, posts_text },			/* %B */ /* FIXME: can be used outside Rs/Re. */
  	{ NULL, posts_text },			/* %D */
  	{ NULL, posts_text },			/* %I */
  	{ NULL, posts_text },			/* %J */
  	{ NULL, posts_text },			/* %N */
  	{ NULL, posts_text },			/* %O */
  	{ NULL, posts_text },			/* %P */
  	{ NULL, posts_text },			/* %R */
  	{ NULL, posts_text },			/* %T */ /* FIXME: can be used outside Rs/Re. */
  	{ NULL, posts_text },			/* %V */
  	{ NULL, NULL },				/* Ac */
  	{ NULL, NULL },				/* Ao */
  	{ NULL, NULL },				/* Aq */
  	{ NULL, posts_at },			/* At */ 
  	{ NULL, NULL },				/* Bc */
  	{ NULL, posts_bf },			/* Bf */
  	{ NULL, NULL },				/* Bo */
  	{ NULL, NULL },				/* Bq */
  	{ NULL, NULL },				/* Bsx */
  	{ NULL, posts_bx },			/* Bx */
  	{ NULL, posts_bool },			/* Db */
  	{ NULL, NULL },				/* Dc */
  	{ NULL, NULL },				/* Do */
  	{ NULL, NULL },				/* Dq */
  	{ NULL, NULL },				/* Ec */
  	{ NULL, NULL },				/* Ef */ 
  	{ NULL, NULL },				/* Em */ 
  	{ NULL, NULL },				/* Eo */
  	{ NULL, NULL },				/* Fx */
  	{ NULL, NULL },				/* Ms */ 
  	{ NULL, posts_notext },			/* No */
  	{ NULL, posts_ns },			/* Ns */
  	{ NULL, NULL },				/* Nx */
  	{ NULL, NULL },				/* Ox */
  	{ NULL, NULL },				/* Pc */
  	{ NULL, posts_text1 },			/* Pf */
  	{ NULL, NULL },				/* Po */
  	{ NULL, NULL },				/* Pq */
  	{ NULL, NULL },				/* Qc */
  	{ NULL, NULL },				/* Ql */
  	{ NULL, NULL },				/* Qo */
  	{ NULL, NULL },				/* Qq */
  	{ NULL, NULL },				/* Re */
  	{ NULL, posts_rs },			/* Rs */
  	{ NULL, NULL },				/* Sc */
  	{ NULL, NULL },				/* So */
  	{ NULL, NULL },				/* Sq */
  	{ NULL, posts_bool },			/* Sm */ 
  	{ NULL, NULL },				/* Sx */
  	{ NULL, NULL },				/* Sy */
  	{ NULL, NULL },				/* Tn */
  	{ NULL, NULL },				/* Ux */
  	{ NULL, NULL },				/* Xc */
  	{ NULL, NULL },				/* Xo */
  	{ NULL, posts_fo },			/* Fo */ 
  	{ NULL, NULL },				/* Fc */ 
  	{ NULL, NULL },				/* Oo */
  	{ NULL, NULL },				/* Oc */
  	{ NULL, posts_bk },			/* Bk */
  	{ NULL, NULL },				/* Ek */
  	{ NULL, posts_eoln },			/* Bt */
  	{ NULL, NULL },				/* Hf */
  	{ NULL, NULL },				/* Fr */
  	{ NULL, posts_eoln },			/* Ud */
  	{ NULL, posts_lb },			/* Lb */
  	{ NULL, posts_notext },			/* Lp */ 
  	{ NULL, NULL },				/* Lk */ 
  	{ NULL, posts_defaults },		/* Mt */ 
  	{ NULL, NULL },				/* Brq */ 
  	{ NULL, NULL },				/* Bro */ 
  	{ NULL, NULL },				/* Brc */ 
  	{ NULL, posts_text },			/* %C */
  	{ NULL, NULL },				/* Es */
  	{ NULL, NULL },				/* En */
  	{ NULL, NULL },				/* Dx */
  	{ NULL, posts_text },			/* %Q */
  	{ NULL, posts_notext },			/* br */
  	{ pres_pp, posts_sp },			/* sp */
  	{ NULL, posts_text1 },			/* %U */
  	{ NULL, NULL },				/* Ta */
  };
  
  #define	RSORD_MAX 14 /* Number of `Rs' blocks. */
  
  static	const enum mdoct rsord[RSORD_MAX] = {
  	MDOC__A,
  	MDOC__T,
  	MDOC__B,
  	MDOC__I,
  	MDOC__J,
  	MDOC__R,
  	MDOC__N,
  	MDOC__V,
  	MDOC__P,
  	MDOC__Q,
  	MDOC__D,
  	MDOC__O,
  	MDOC__C,
  	MDOC__U
  };
  
  static	const char * const secnames[SEC__MAX] = {
  	NULL,
  	"NAME",
  	"LIBRARY",
  	"SYNOPSIS",
  	"DESCRIPTION",
  	"IMPLEMENTATION NOTES",
  	"RETURN VALUES",
  	"ENVIRONMENT",
  	"FILES",
  	"EXIT STATUS",
  	"EXAMPLES",
  	"DIAGNOSTICS",
  	"COMPATIBILITY",
  	"ERRORS",
  	"SEE ALSO",
  	"STANDARDS",
  	"HISTORY",
  	"AUTHORS",
  	"CAVEATS",
  	"BUGS",
  	"SECURITY CONSIDERATIONS",
  	NULL
  };
  
  int
  mdoc_valid_pre(struct mdoc *mdoc, struct mdoc_node *n)
  {
  	v_pre		*p;
  	int		 line, pos;
  	char		*tp;
  
  	switch (n->type) {
  	case (MDOC_TEXT):
  		tp = n->string;
  		line = n->line;
  		pos = n->pos;
  		check_text(mdoc, line, pos, tp);
  		/* FALLTHROUGH */
  	case (MDOC_TBL):
  		/* FALLTHROUGH */
  	case (MDOC_EQN):
  		/* FALLTHROUGH */
  	case (MDOC_ROOT):
  		return(1);
  	default:
  		break;
  	}
  
  	check_args(mdoc, n);
  
  	if (NULL == mdoc_valids[n->tok].pre)
  		return(1);
  	for (p = mdoc_valids[n->tok].pre; *p; p++)
  		if ( ! (*p)(mdoc, n)) 
  			return(0);
  	return(1);
  }
  
  
  int
  mdoc_valid_post(struct mdoc *mdoc)
  {
  	v_post		*p;
  
  	if (MDOC_VALID & mdoc->last->flags)
  		return(1);
  	mdoc->last->flags |= MDOC_VALID;
  
  	switch (mdoc->last->type) {
  	case (MDOC_TEXT):
  		/* FALLTHROUGH */
  	case (MDOC_EQN):
  		/* FALLTHROUGH */
  	case (MDOC_TBL):
  		return(1);
  	case (MDOC_ROOT):
  		return(post_root(mdoc));
  	default:
  		break;
  	}
  
  	if (NULL == mdoc_valids[mdoc->last->tok].post)
  		return(1);
  	for (p = mdoc_valids[mdoc->last->tok].post; *p; p++)
  		if ( ! (*p)(mdoc)) 
  			return(0);
  
  	return(1);
  }
  
  static int
  check_count(struct mdoc *m, enum mdoc_type type, 
  		enum check_lvl lvl, enum check_ineq ineq, int val)
  {
  	const char	*p;
  	enum mandocerr	 t;
  
  	if (m->last->type != type)
  		return(1);
  	
  	switch (ineq) {
  	case (CHECK_LT):
  		p = "less than ";
  		if (m->last->nchild < val)
  			return(1);
  		break;
  	case (CHECK_GT):
  		p = "more than ";
  		if (m->last->nchild > val)
  			return(1);
  		break;
  	case (CHECK_EQ):
  		p = "";
  		if (val == m->last->nchild)
  			return(1);
  		break;
  	default:
  		abort();
  		/* NOTREACHED */
  	}
  
  	t = lvl == CHECK_WARN ? MANDOCERR_ARGCWARN : MANDOCERR_ARGCOUNT;
  	mandoc_vmsg(t, m->parse, m->last->line, m->last->pos,
  			"want %s%d children (have %d)",
  			p, val, m->last->nchild);
  	return(1);
  }
  
  static int
  berr_ge1(POST_ARGS)
  {
  
  	return(check_count(mdoc, MDOC_BODY, CHECK_ERROR, CHECK_GT, 0));
  }
  
  static int
  bwarn_ge1(POST_ARGS)
  {
  	return(check_count(mdoc, MDOC_BODY, CHECK_WARN, CHECK_GT, 0));
  }
  
  static int
  ewarn_eq0(POST_ARGS)
  {
  	return(check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_EQ, 0));
  }
  
  static int
  ewarn_eq1(POST_ARGS)
  {
  	return(check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_EQ, 1));
  }
  
  static int
  ewarn_ge1(POST_ARGS)
  {
  	return(check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_GT, 0));
  }
  
  static int
  ewarn_le1(POST_ARGS)
  {
  	return(check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_LT, 2));
  }
  
  static int
  hwarn_eq0(POST_ARGS)
  {
  	return(check_count(mdoc, MDOC_HEAD, CHECK_WARN, CHECK_EQ, 0));
  }
  
  static int
  hwarn_eq1(POST_ARGS)
  {
  	return(check_count(mdoc, MDOC_HEAD, CHECK_WARN, CHECK_EQ, 1));
  }
  
  static int
  hwarn_ge1(POST_ARGS)
  {
  	return(check_count(mdoc, MDOC_HEAD, CHECK_WARN, CHECK_GT, 0));
  }
  
  static int
  hwarn_le1(POST_ARGS)
  {
  	return(check_count(mdoc, MDOC_HEAD, CHECK_WARN, CHECK_LT, 2));
  }
  
  static void
  check_args(struct mdoc *m, struct mdoc_node *n)
  {
  	int		 i;
  
  	if (NULL == n->args)
  		return;
  
  	assert(n->args->argc);
  	for (i = 0; i < (int)n->args->argc; i++)
  		check_argv(m, n, &n->args->argv[i]);
  }
  
  static void
  check_argv(struct mdoc *m, struct mdoc_node *n, struct mdoc_argv *v)
  {
  	int		 i;
  
  	for (i = 0; i < (int)v->sz; i++)
  		check_text(m, v->line, v->pos, v->value[i]);
  
  	/* FIXME: move to post_std(). */
  
  	if (MDOC_Std == v->arg)
  		if ( ! (v->sz || m->meta.name))
  			mdoc_nmsg(m, n, MANDOCERR_NONAME);
  }
  
  static void
  check_text(struct mdoc *m, int ln, int pos, char *p)
  {
  	char		*cp;
  
  	if (MDOC_LITERAL & m->flags)
  		return;
  
  	for (cp = p; NULL != (p = strchr(p, '\t')); p++)
  		mdoc_pmsg(m, ln, pos + (int)(p - cp), MANDOCERR_BADTAB);
  }
  
  static int
  check_parent(PRE_ARGS, enum mdoct tok, enum mdoc_type t)
  {
  
  	assert(n->parent);
  	if ((MDOC_ROOT == t || tok == n->parent->tok) &&
  			(t == n->parent->type))
  		return(1);
  
  	mandoc_vmsg(MANDOCERR_SYNTCHILD, mdoc->parse, n->line, 
  			n->pos, "want parent %s", MDOC_ROOT == t ? 
  			"<root>" : mdoc_macronames[tok]);
  	return(0);
  }
  
  
  static int
  pre_display(PRE_ARGS)
  {
  	struct mdoc_node *node;
  
  	if (MDOC_BLOCK != n->type)
  		return(1);
  
  	for (node = mdoc->last->parent; node; node = node->parent) 
  		if (MDOC_BLOCK == node->type)
  			if (MDOC_Bd == node->tok)
  				break;
  
  	if (node)
  		mdoc_nmsg(mdoc, n, MANDOCERR_NESTEDDISP);
  
  	return(1);
  }
  
  
  static int
  pre_bl(PRE_ARGS)
  {
  	int		  i, comp, dup;
  	const char	 *offs, *width;
  	enum mdoc_list	  lt;
  	struct mdoc_node *np;
  
  	if (MDOC_BLOCK != n->type) {
  		if (ENDBODY_NOT != n->end) {
  			assert(n->pending);
  			np = n->pending->parent;
  		} else
  			np = n->parent;
  
  		assert(np);
  		assert(MDOC_BLOCK == np->type);
  		assert(MDOC_Bl == np->tok);
  		return(1);
  	}
  
  	/* 
  	 * First figure out which kind of list to use: bind ourselves to
  	 * the first mentioned list type and warn about any remaining
  	 * ones.  If we find no list type, we default to LIST_item.
  	 */
  
  	/* LINTED */
  	for (i = 0; n->args && i < (int)n->args->argc; i++) {
  		lt = LIST__NONE;
  		dup = comp = 0;
  		width = offs = NULL;
  		switch (n->args->argv[i].arg) {
  		/* Set list types. */
  		case (MDOC_Bullet):
  			lt = LIST_bullet;
  			break;
  		case (MDOC_Dash):
  			lt = LIST_dash;
  			break;
  		case (MDOC_Enum):
  			lt = LIST_enum;
  			break;
  		case (MDOC_Hyphen):
  			lt = LIST_hyphen;
  			break;
  		case (MDOC_Item):
  			lt = LIST_item;
  			break;
  		case (MDOC_Tag):
  			lt = LIST_tag;
  			break;
  		case (MDOC_Diag):
  			lt = LIST_diag;
  			break;
  		case (MDOC_Hang):
  			lt = LIST_hang;
  			break;
  		case (MDOC_Ohang):
  			lt = LIST_ohang;
  			break;
  		case (MDOC_Inset):
  			lt = LIST_inset;
  			break;
  		case (MDOC_Column):
  			lt = LIST_column;
  			break;
  		/* Set list arguments. */
  		case (MDOC_Compact):
  			dup = n->norm->Bl.comp;
  			comp = 1;
  			break;
  		case (MDOC_Width):
  			/* NB: this can be empty! */
  			if (n->args->argv[i].sz) {
  				width = n->args->argv[i].value[0];
  				dup = (NULL != n->norm->Bl.width);
  				break;
  			}
  			mdoc_nmsg(mdoc, n, MANDOCERR_IGNARGV);
  			break;
  		case (MDOC_Offset):
  			/* NB: this can be empty! */
  			if (n->args->argv[i].sz) {
  				offs = n->args->argv[i].value[0];
  				dup = (NULL != n->norm->Bl.offs);
  				break;
  			}
  			mdoc_nmsg(mdoc, n, MANDOCERR_IGNARGV);
  			break;
  		default:
  			continue;
  		}
  
  		/* Check: duplicate auxiliary arguments. */
  
  		if (dup)
  			mdoc_nmsg(mdoc, n, MANDOCERR_ARGVREP);
  
  		if (comp && ! dup)
  			n->norm->Bl.comp = comp;
  		if (offs && ! dup)
  			n->norm->Bl.offs = offs;
  		if (width && ! dup)
  			n->norm->Bl.width = width;
  
  		/* Check: multiple list types. */
  
  		if (LIST__NONE != lt && n->norm->Bl.type != LIST__NONE)
  			mdoc_nmsg(mdoc, n, MANDOCERR_LISTREP);
  
  		/* Assign list type. */
  
  		if (LIST__NONE != lt && n->norm->Bl.type == LIST__NONE) {
  			n->norm->Bl.type = lt;
  			/* Set column information, too. */
  			if (LIST_column == lt) {
  				n->norm->Bl.ncols = 
  					n->args->argv[i].sz;
  				n->norm->Bl.cols = (void *)
  					n->args->argv[i].value;
  			}
  		}
  
  		/* The list type should come first. */
  
  		if (n->norm->Bl.type == LIST__NONE)
  			if (n->norm->Bl.width || 
  					n->norm->Bl.offs || 
  					n->norm->Bl.comp)
  				mdoc_nmsg(mdoc, n, MANDOCERR_LISTFIRST);
  
  		continue;
  	}
  
  	/* Allow lists to default to LIST_item. */
  
  	if (LIST__NONE == n->norm->Bl.type) {
  		mdoc_nmsg(mdoc, n, MANDOCERR_LISTTYPE);
  		n->norm->Bl.type = LIST_item;
  	}
  
  	/* 
  	 * Validate the width field.  Some list types don't need width
  	 * types and should be warned about them.  Others should have it
  	 * and must also be warned.
  	 */
  
  	switch (n->norm->Bl.type) {
  	case (LIST_tag):
  		if (n->norm->Bl.width)
  			break;
  		mdoc_nmsg(mdoc, n, MANDOCERR_NOWIDTHARG);
  		break;
  	case (LIST_column):
  		/* FALLTHROUGH */
  	case (LIST_diag):
  		/* FALLTHROUGH */
  	case (LIST_ohang):
  		/* FALLTHROUGH */
  	case (LIST_inset):
  		/* FALLTHROUGH */
  	case (LIST_item):
  		if (n->norm->Bl.width)
  			mdoc_nmsg(mdoc, n, MANDOCERR_IGNARGV);
  		break;
  	default:
  		break;
  	}
  
  	return(1);
  }
  
  
  static int
  pre_bd(PRE_ARGS)
  {
  	int		  i, dup, comp;
  	enum mdoc_disp 	  dt;
  	const char	 *offs;
  	struct mdoc_node *np;
  
  	if (MDOC_BLOCK != n->type) {
  		if (ENDBODY_NOT != n->end) {
  			assert(n->pending);
  			np = n->pending->parent;
  		} else
  			np = n->parent;
  
  		assert(np);
  		assert(MDOC_BLOCK == np->type);
  		assert(MDOC_Bd == np->tok);
  		return(1);
  	}
  
  	/* LINTED */
  	for (i = 0; n->args && i < (int)n->args->argc; i++) {
  		dt = DISP__NONE;
  		dup = comp = 0;
  		offs = NULL;
  
  		switch (n->args->argv[i].arg) {
  		case (MDOC_Centred):
  			dt = DISP_centred;
  			break;
  		case (MDOC_Ragged):
  			dt = DISP_ragged;
  			break;
  		case (MDOC_Unfilled):
  			dt = DISP_unfilled;
  			break;
  		case (MDOC_Filled):
  			dt = DISP_filled;
  			break;
  		case (MDOC_Literal):
  			dt = DISP_literal;
  			break;
  		case (MDOC_File):
  			mdoc_nmsg(mdoc, n, MANDOCERR_BADDISP);
  			return(0);
  		case (MDOC_Offset):
  			/* NB: this can be empty! */
  			if (n->args->argv[i].sz) {
  				offs = n->args->argv[i].value[0];
  				dup = (NULL != n->norm->Bd.offs);
  				break;
  			}
  			mdoc_nmsg(mdoc, n, MANDOCERR_IGNARGV);
  			break;
  		case (MDOC_Compact):
  			comp = 1;
  			dup = n->norm->Bd.comp;
  			break;
  		default:
  			abort();
  			/* NOTREACHED */
  		}
  
  		/* Check whether we have duplicates. */
  
  		if (dup)
  			mdoc_nmsg(mdoc, n, MANDOCERR_ARGVREP);
  
  		/* Make our auxiliary assignments. */
  
  		if (offs && ! dup)
  			n->norm->Bd.offs = offs;
  		if (comp && ! dup)
  			n->norm->Bd.comp = comp;
  
  		/* Check whether a type has already been assigned. */
  
  		if (DISP__NONE != dt && n->norm->Bd.type != DISP__NONE)
  			mdoc_nmsg(mdoc, n, MANDOCERR_DISPREP);
  
  		/* Make our type assignment. */
  
  		if (DISP__NONE != dt && n->norm->Bd.type == DISP__NONE)
  			n->norm->Bd.type = dt;
  	}
  
  	if (DISP__NONE == n->norm->Bd.type) {
  		mdoc_nmsg(mdoc, n, MANDOCERR_DISPTYPE);
  		n->norm->Bd.type = DISP_ragged;
  	}
  
  	return(1);
  }
  
  
  static int
  pre_ss(PRE_ARGS)
  {
  
  	if (MDOC_BLOCK != n->type)
  		return(1);
  	return(check_parent(mdoc, n, MDOC_Sh, MDOC_BODY));
  }
  
  
  static int
  pre_sh(PRE_ARGS)
  {
  
  	if (MDOC_BLOCK != n->type)
  		return(1);
  
  	roff_regunset(mdoc->roff, REG_nS);
  	return(check_parent(mdoc, n, MDOC_MAX, MDOC_ROOT));
  }
  
  
  static int
  pre_it(PRE_ARGS)
  {
  
  	if (MDOC_BLOCK != n->type)
  		return(1);
  
  	return(check_parent(mdoc, n, MDOC_Bl, MDOC_BODY));
  }
  
  
  static int
  pre_an(PRE_ARGS)
  {
  	int		 i;
  
  	if (NULL == n->args)
  		return(1);
  	
  	for (i = 1; i < (int)n->args->argc; i++)
  		mdoc_pmsg(mdoc, n->args->argv[i].line, 
  			n->args->argv[i].pos, MANDOCERR_IGNARGV);
  
  	if (MDOC_Split == n->args->argv[0].arg)
  		n->norm->An.auth = AUTH_split;
  	else if (MDOC_Nosplit == n->args->argv[0].arg)
  		n->norm->An.auth = AUTH_nosplit;
  	else
  		abort();
  
  	return(1);
  }
  
  static int
  pre_std(PRE_ARGS)
  {
  
  	if (n->args && 1 == n->args->argc)
  		if (MDOC_Std == n->args->argv[0].arg)
  			return(1);
  
  	mdoc_nmsg(mdoc, n, MANDOCERR_NOARGV);
  	return(1);
  }
  
  static int
  pre_dt(PRE_ARGS)
  {
  
  	if (NULL == mdoc->meta.date || mdoc->meta.os)
  		mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO);
  
  	if (mdoc->meta.title)
  		mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP);
  
  	return(1);
  }
  
  static int
  pre_os(PRE_ARGS)
  {
  
  	if (NULL == mdoc->meta.title || NULL == mdoc->meta.date)
  		mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO);
  
  	if (mdoc->meta.os)
  		mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP);
  
  	return(1);
  }
  
  static int
  pre_dd(PRE_ARGS)
  {
  
  	if (mdoc->meta.title || mdoc->meta.os)
  		mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO);
  
  	if (mdoc->meta.date)
  		mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP);
  
  	return(1);
  }
  
  
  static int
  post_bf(POST_ARGS)
  {
  	struct mdoc_node *np;
  	enum mdocargt	  arg;
  
  	/*
  	 * Unlike other data pointers, these are "housed" by the HEAD
  	 * element, which contains the goods.
  	 */
  
  	if (MDOC_HEAD != mdoc->last->type) {
  		if (ENDBODY_NOT != mdoc->last->end) {
  			assert(mdoc->last->pending);
  			np = mdoc->last->pending->parent->head;
  		} else if (MDOC_BLOCK != mdoc->last->type) {
  			np = mdoc->last->parent->head;
  		} else 
  			np = mdoc->last->head;
  
  		assert(np);
  		assert(MDOC_HEAD == np->type);
  		assert(MDOC_Bf == np->tok);
  		return(1);
  	}
  
  	np = mdoc->last;
  	assert(MDOC_BLOCK == np->parent->type);
  	assert(MDOC_Bf == np->parent->tok);
  
  	/* 
  	 * Cannot have both argument and parameter.
  	 * If neither is specified, let it through with a warning. 
  	 */
  
  	if (np->parent->args && np->child) {
  		mdoc_nmsg(mdoc, np, MANDOCERR_SYNTARGVCOUNT);
  		return(0);
  	} else if (NULL == np->parent->args && NULL == np->child) {
  		mdoc_nmsg(mdoc, np, MANDOCERR_FONTTYPE);
  		return(1);
  	}
  
  	/* Extract argument into data. */
  	
  	if (np->parent->args) {
  		arg = np->parent->args->argv[0].arg;
  		if (MDOC_Emphasis == arg)
  			np->norm->Bf.font = FONT_Em;
  		else if (MDOC_Literal == arg)
  			np->norm->Bf.font = FONT_Li;
  		else if (MDOC_Symbolic == arg)
  			np->norm->Bf.font = FONT_Sy;
  		else
  			abort();
  		return(1);
  	}
  
  	/* Extract parameter into data. */
  
  	if (0 == strcmp(np->child->string, "Em"))
  		np->norm->Bf.font = FONT_Em;
  	else if (0 == strcmp(np->child->string, "Li"))
  		np->norm->Bf.font = FONT_Li;
  	else if (0 == strcmp(np->child->string, "Sy"))
  		np->norm->Bf.font = FONT_Sy;
  	else 
  		mdoc_nmsg(mdoc, np, MANDOCERR_FONTTYPE);
  
  	return(1);
  }
  
  static int
  post_lb(POST_ARGS)
  {
  	const char	*p;
  	char		*buf;
  	size_t		 sz;
  
  	check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_EQ, 1);
  
  	assert(mdoc->last->child);
  	assert(MDOC_TEXT == mdoc->last->child->type);
  
  	p = mdoc_a2lib(mdoc->last->child->string);
  
  	/* If lookup ok, replace with table value. */
  
  	if (p) {
  		free(mdoc->last->child->string);
  		mdoc->last->child->string = mandoc_strdup(p);
  		return(1);
  	}
  
  	/* If not, use "library ``xxxx''. */
  
  	sz = strlen(mdoc->last->child->string) +
  		2 + strlen("\\(lqlibrary\\(rq");
  	buf = mandoc_malloc(sz);
  	snprintf(buf, sz, "library \\(lq%s\\(rq", 
  			mdoc->last->child->string);
  	free(mdoc->last->child->string);
  	mdoc->last->child->string = buf;
  	return(1);
  }
  
  static int
  post_eoln(POST_ARGS)
  {
  
  	if (mdoc->last->child)
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGSLOST);
  	return(1);
  }
  
  
  static int
  post_vt(POST_ARGS)
  {
  	const struct mdoc_node *n;
  
  	/*
  	 * The Vt macro comes in both ELEM and BLOCK form, both of which
  	 * have different syntaxes (yet more context-sensitive
  	 * behaviour).  ELEM types must have a child, which is already
  	 * guaranteed by the in_line parsing routine; BLOCK types,
  	 * specifically the BODY, should only have TEXT children.
  	 */
  
  	if (MDOC_BODY != mdoc->last->type)
  		return(1);
  	
  	for (n = mdoc->last->child; n; n = n->next)
  		if (MDOC_TEXT != n->type) 
  			mdoc_nmsg(mdoc, n, MANDOCERR_CHILD);
  
  	return(1);
  }
  
  
  static int
  post_nm(POST_ARGS)
  {
  	char		 buf[BUFSIZ];
  	int		 c;
  
  	/* If no child specified, make sure we have the meta name. */
  
  	if (NULL == mdoc->last->child && NULL == mdoc->meta.name) {
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NONAME);
  		return(1);
  	} else if (mdoc->meta.name)
  		return(1);
  
  	/* If no meta name, set it from the child. */
  
  	buf[0] = '\0';
  	if (-1 == (c = concat(buf, mdoc->last->child, BUFSIZ))) {
  		mdoc_nmsg(mdoc, mdoc->last->child, MANDOCERR_MEM);
  		return(0);
  	}
  
  	assert(c);
  	mdoc->meta.name = mandoc_strdup(buf);
  	return(1);
  }
  
  static int
  post_literal(POST_ARGS)
  {
  	
  	/*
  	 * The `Dl' (note "el" not "one") and `Bd' macros unset the
  	 * MDOC_LITERAL flag as they leave.  Note that `Bd' only sets
  	 * this in literal mode, but it doesn't hurt to just switch it
  	 * off in general since displays can't be nested.
  	 */
  
  	if (MDOC_BODY == mdoc->last->type)
  		mdoc->flags &= ~MDOC_LITERAL;
  
  	return(1);
  }
  
  static int
  post_defaults(POST_ARGS)
  {
  	struct mdoc_node *nn;
  
  	/*
  	 * The `Ar' defaults to "file ..." if no value is provided as an
  	 * argument; the `Mt' and `Pa' macros use "~"; the `Li' just
  	 * gets an empty string.
  	 */
  
  	if (mdoc->last->child)
  		return(1);
  	
  	nn = mdoc->last;
  	mdoc->next = MDOC_NEXT_CHILD;
  
  	switch (nn->tok) {
  	case (MDOC_Ar):
  		if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, "file"))
  			return(0);
  		if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, "..."))
  			return(0);
  		break;
  	case (MDOC_At):
  		if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, "AT&T"))
  			return(0);
  		if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, "UNIX"))
  			return(0);
  		break;
  	case (MDOC_Li):
  		if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, ""))
  			return(0);
  		break;
  	case (MDOC_Pa):
  		/* FALLTHROUGH */
  	case (MDOC_Mt):
  		if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, "~"))
  			return(0);
  		break;
  	default:
  		abort();
  		/* NOTREACHED */
  	} 
  
  	mdoc->last = nn;
  	return(1);
  }
  
  static int
  post_at(POST_ARGS)
  {
  	const char	 *p, *q;
  	char		 *buf;
  	size_t		  sz;
  
  	/*
  	 * If we have a child, look it up in the standard keys.  If a
  	 * key exist, use that instead of the child; if it doesn't,
  	 * prefix "AT&T UNIX " to the existing data.
  	 */
  	
  	if (NULL == mdoc->last->child)
  		return(1);
  
  	assert(MDOC_TEXT == mdoc->last->child->type);
  	p = mdoc_a2att(mdoc->last->child->string);
  
  	if (p) {
  		free(mdoc->last->child->string);
  		mdoc->last->child->string = mandoc_strdup(p);
  	} else {
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADATT);
  		p = "AT&T UNIX ";
  		q = mdoc->last->child->string;
  		sz = strlen(p) + strlen(q) + 1;
  		buf = mandoc_malloc(sz);
  		strlcpy(buf, p, sz);
  		strlcat(buf, q, sz);
  		free(mdoc->last->child->string);
  		mdoc->last->child->string = buf;
  	}
  
  	return(1);
  }
  
  static int
  post_an(POST_ARGS)
  {
  	struct mdoc_node *np;
  
  	np = mdoc->last;
  	if (AUTH__NONE == np->norm->An.auth) {
  		if (0 == np->child)
  			check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_GT, 0);
  	} else if (np->child)
  		check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_EQ, 0);
  
  	return(1);
  }
  
  
  static int
  post_it(POST_ARGS)
  {
  	int		  i, cols;
  	enum mdoc_list	  lt;
  	struct mdoc_node *n, *c;
  	enum mandocerr	  er;
  
  	if (MDOC_BLOCK != mdoc->last->type)
  		return(1);
  
  	n = mdoc->last->parent->parent;
  	lt = n->norm->Bl.type;
  
  	if (LIST__NONE == lt) {
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_LISTTYPE);
  		return(1);
  	}
  
  	switch (lt) {
  	case (LIST_tag):
  		if (mdoc->last->head->child)
  			break;
  		/* FIXME: give this a dummy value. */
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS);
  		break;
  	case (LIST_hang):
  		/* FALLTHROUGH */
  	case (LIST_ohang):
  		/* FALLTHROUGH */
  	case (LIST_inset):
  		/* FALLTHROUGH */
  	case (LIST_diag):
  		if (NULL == mdoc->last->head->child)
  			mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS);
  		break;
  	case (LIST_bullet):
  		/* FALLTHROUGH */
  	case (LIST_dash):
  		/* FALLTHROUGH */
  	case (LIST_enum):
  		/* FALLTHROUGH */
  	case (LIST_hyphen):
  		if (NULL == mdoc->last->body->child)
  			mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY);
  		/* FALLTHROUGH */
  	case (LIST_item):
  		if (mdoc->last->head->child)
  			mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGSLOST);
  		break;
  	case (LIST_column):
  		cols = (int)n->norm->Bl.ncols;
  
  		assert(NULL == mdoc->last->head->child);
  
  		if (NULL == mdoc->last->body->child)
  			mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY);
  
  		for (i = 0, c = mdoc->last->child; c; c = c->next)
  			if (MDOC_BODY == c->type)
  				i++;
  
  		if (i < cols)
  			er = MANDOCERR_ARGCOUNT;
  		else if (i == cols || i == cols + 1)
  			break;
  		else
  			er = MANDOCERR_SYNTARGCOUNT;
  
  		mandoc_vmsg(er, mdoc->parse, mdoc->last->line, 
  				mdoc->last->pos, 
  				"columns == %d (have %d)", cols, i);
  		return(MANDOCERR_ARGCOUNT == er);
  	default:
  		break;
  	}
  
  	return(1);
  }
  
  static int
  post_bl_block(POST_ARGS) 
  {
  	struct mdoc_node *n;
  
  	/*
  	 * These are fairly complicated, so we've broken them into two
  	 * functions.  post_bl_block_tag() is called when a -tag is
  	 * specified, but no -width (it must be guessed).  The second
  	 * when a -width is specified (macro indicators must be
  	 * rewritten into real lengths).
  	 */
  
  	n = mdoc->last;
  
  	if (LIST_tag == n->norm->Bl.type && 
  			NULL == n->norm->Bl.width) {
  		if ( ! post_bl_block_tag(mdoc))
  			return(0);
  	} else if (NULL != n->norm->Bl.width) {
  		if ( ! post_bl_block_width(mdoc))
  			return(0);
  	} else 
  		return(1);
  
  	assert(n->norm->Bl.width);
  	return(1);
  }
  
  static int
  post_bl_block_width(POST_ARGS)
  {
  	size_t		  width;
  	int		  i;
  	enum mdoct	  tok;
  	struct mdoc_node *n;
  	char		  buf[NUMSIZ];
  
  	n = mdoc->last;
  
  	/*
  	 * Calculate the real width of a list from the -width string,
  	 * which may contain a macro (with a known default width), a
  	 * literal string, or a scaling width.
  	 *
  	 * If the value to -width is a macro, then we re-write it to be
  	 * the macro's width as set in share/tmac/mdoc/doc-common.
  	 */
  
  	if (0 == strcmp(n->norm->Bl.width, "Ds"))
  		width = 6;
  	else if (MDOC_MAX == (tok = mdoc_hash_find(n->norm->Bl.width)))
  		return(1);
  	else if (0 == (width = macro2len(tok)))  {
  		mdoc_nmsg(mdoc, n, MANDOCERR_BADWIDTH);
  		return(1);
  	}
  
  	/* The value already exists: free and reallocate it. */
  
  	assert(n->args);
  
  	for (i = 0; i < (int)n->args->argc; i++) 
  		if (MDOC_Width == n->args->argv[i].arg)
  			break;
  
  	assert(i < (int)n->args->argc);
  
  	snprintf(buf, NUMSIZ, "%un", (unsigned int)width);
  	free(n->args->argv[i].value[0]);
  	n->args->argv[i].value[0] = mandoc_strdup(buf);
  
  	/* Set our width! */
  	n->norm->Bl.width = n->args->argv[i].value[0];
  	return(1);
  }
  
  static int
  post_bl_block_tag(POST_ARGS)
  {
  	struct mdoc_node *n, *nn;
  	size_t		  sz, ssz;
  	int		  i;
  	char		  buf[NUMSIZ];
  
  	/*
  	 * Calculate the -width for a `Bl -tag' list if it hasn't been
  	 * provided.  Uses the first head macro.  NOTE AGAIN: this is
  	 * ONLY if the -width argument has NOT been provided.  See
  	 * post_bl_block_width() for converting the -width string.
  	 */
  
  	sz = 10;
  	n = mdoc->last;
  
  	for (nn = n->body->child; nn; nn = nn->next) {
  		if (MDOC_It != nn->tok)
  			continue;
  
  		assert(MDOC_BLOCK == nn->type);
  		nn = nn->head->child;
  
  		if (nn == NULL)
  			break;
  
  		if (MDOC_TEXT == nn->type) {
  			sz = strlen(nn->string) + 1;
  			break;
  		}
  
  		if (0 != (ssz = macro2len(nn->tok)))
  			sz = ssz;
  
  		break;
  	} 
  
  	/* Defaults to ten ens. */
  
  	snprintf(buf, NUMSIZ, "%un", (unsigned int)sz);
  
  	/*
  	 * We have to dynamically add this to the macro's argument list.
  	 * We're guaranteed that a MDOC_Width doesn't already exist.
  	 */
  
  	assert(n->args);
  	i = (int)(n->args->argc)++;
  
  	n->args->argv = mandoc_realloc(n->args->argv, 
  			n->args->argc * sizeof(struct mdoc_argv));
  
  	n->args->argv[i].arg = MDOC_Width;
  	n->args->argv[i].line = n->line;
  	n->args->argv[i].pos = n->pos;
  	n->args->argv[i].sz = 1;
  	n->args->argv[i].value = mandoc_malloc(sizeof(char *));
  	n->args->argv[i].value[0] = mandoc_strdup(buf);
  
  	/* Set our width! */
  	n->norm->Bl.width = n->args->argv[i].value[0];
  	return(1);
  }
  
  
  static int
  post_bl_head(POST_ARGS) 
  {
  	struct mdoc_node *np, *nn, *nnp;
  	int		  i, j;
  
  	if (LIST_column != mdoc->last->norm->Bl.type)
  		/* FIXME: this should be ERROR class... */
  		return(hwarn_eq0(mdoc));
  
  	/*
  	 * Convert old-style lists, where the column width specifiers
  	 * trail as macro parameters, to the new-style ("normal-form")
  	 * lists where they're argument values following -column.
  	 */
  
  	/* First, disallow both types and allow normal-form. */
  
  	/* 
  	 * TODO: technically, we can accept both and just merge the two
  	 * lists, but I'll leave that for another day.
  	 */
  
  	if (mdoc->last->norm->Bl.ncols && mdoc->last->nchild) {
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_COLUMNS);
  		return(0);
  	} else if (NULL == mdoc->last->child)
  		return(1);
  
  	np = mdoc->last->parent;
  	assert(np->args);
  
  	for (j = 0; j < (int)np->args->argc; j++) 
  		if (MDOC_Column == np->args->argv[j].arg)
  			break;
  
  	assert(j < (int)np->args->argc);
  	assert(0 == np->args->argv[j].sz);
  
  	/*
  	 * Accommodate for new-style groff column syntax.  Shuffle the
  	 * child nodes, all of which must be TEXT, as arguments for the
  	 * column field.  Then, delete the head children.
  	 */
  
  	np->args->argv[j].sz = (size_t)mdoc->last->nchild;
  	np->args->argv[j].value = mandoc_malloc
  		((size_t)mdoc->last->nchild * sizeof(char *));
  
  	mdoc->last->norm->Bl.ncols = np->args->argv[j].sz;
  	mdoc->last->norm->Bl.cols = (void *)np->args->argv[j].value;
  
  	for (i = 0, nn = mdoc->last->child; nn; i++) {
  		np->args->argv[j].value[i] = nn->string;
  		nn->string = NULL;
  		nnp = nn;
  		nn = nn->next;
  		mdoc_node_delete(NULL, nnp);
  	}
  
  	mdoc->last->nchild = 0;
  	mdoc->last->child = NULL;
  
  	return(1);
  }
  
  static int
  post_bl(POST_ARGS)
  {
  	struct mdoc_node	*n;
  
  	if (MDOC_HEAD == mdoc->last->type) 
  		return(post_bl_head(mdoc));
  	if (MDOC_BLOCK == mdoc->last->type)
  		return(post_bl_block(mdoc));
  	if (MDOC_BODY != mdoc->last->type)
  		return(1);
  
  	for (n = mdoc->last->child; n; n = n->next) {
  		switch (n->tok) {
  		case (MDOC_Lp):
  			/* FALLTHROUGH */
  		case (MDOC_Pp):
  			mdoc_nmsg(mdoc, n, MANDOCERR_CHILD);
  			/* FALLTHROUGH */
  		case (MDOC_It):
  			/* FALLTHROUGH */
  		case (MDOC_Sm):
  			continue;
  		default:
  			break;
  		}
  
  		mdoc_nmsg(mdoc, n, MANDOCERR_SYNTCHILD);
  		return(0);
  	}
  
  	return(1);
  }
  
  static int
  ebool(struct mdoc *mdoc)
  {
  
  	if (NULL == mdoc->last->child) {
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_MACROEMPTY);
  		mdoc_node_delete(mdoc, mdoc->last);
  		return(1);
  	}
  	check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_EQ, 1);
  
  	assert(MDOC_TEXT == mdoc->last->child->type);
  
  	if (0 == strcmp(mdoc->last->child->string, "on"))
  		return(1);
  	if (0 == strcmp(mdoc->last->child->string, "off"))
  		return(1);
  
  	mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADBOOL);
  	return(1);
  }
  
  static int
  post_root(POST_ARGS)
  {
  	int		  erc;
  	struct mdoc_node *n;
  
  	erc = 0;
  
  	/* Check that we have a finished prologue. */
  
  	if ( ! (MDOC_PBODY & mdoc->flags)) {
  		erc++;
  		mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCPROLOG);
  	}
  
  	n = mdoc->first;
  	assert(n);
  	
  	/* Check that we begin with a proper `Sh'. */
  
  	if (NULL == n->child) {
  		erc++;
  		mdoc_nmsg(mdoc, n, MANDOCERR_NODOCBODY);
  	} else if (MDOC_BLOCK != n->child->type || 
  			MDOC_Sh != n->child->tok) {
  		erc++;
  		/* Can this be lifted?  See rxdebug.1 for example. */
  		mdoc_nmsg(mdoc, n, MANDOCERR_NODOCBODY);
  	}
  
  	return(erc ? 0 : 1);
  }
  
  static int
  post_st(POST_ARGS)
  {
  	struct mdoc_node	 *ch;
  	const char		 *p;
  
  	if (NULL == (ch = mdoc->last->child)) {
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_MACROEMPTY);
  		mdoc_node_delete(mdoc, mdoc->last);
  		return(1);
  	}
  
  	assert(MDOC_TEXT == ch->type);
  
  	if (NULL == (p = mdoc_a2st(ch->string))) {
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADSTANDARD);
  		mdoc_node_delete(mdoc, mdoc->last);
  	} else {
  		free(ch->string);
  		ch->string = mandoc_strdup(p);
  	}
  
  	return(1);
  }
  
  static int
  post_rs(POST_ARGS)
  {
  	struct mdoc_node *nn, *next, *prev;
  	int		  i, j;
  
  	switch (mdoc->last->type) {
  	case (MDOC_HEAD):
  		check_count(mdoc, MDOC_HEAD, CHECK_WARN, CHECK_EQ, 0);
  		return(1);
  	case (MDOC_BODY):
  		if (mdoc->last->child)
  			break;
  		check_count(mdoc, MDOC_BODY, CHECK_WARN, CHECK_GT, 0);
  		return(1);
  	default:
  		return(1);
  	}
  
  	/*
  	 * Make sure only certain types of nodes are allowed within the
  	 * the `Rs' body.  Delete offending nodes and raise a warning.
  	 * Do this before re-ordering for the sake of clarity.
  	 */
  
  	next = NULL;
  	for (nn = mdoc->last->child; nn; nn = next) {
  		for (i = 0; i < RSORD_MAX; i++)
  			if (nn->tok == rsord[i])
  				break;
  
  		if (i < RSORD_MAX) {
  			if (MDOC__J == rsord[i] || MDOC__B == rsord[i])
  				mdoc->last->norm->Rs.quote_T++;
  			next = nn->next;
  			continue;
  		}
  
  		next = nn->next;
  		mdoc_nmsg(mdoc, nn, MANDOCERR_CHILD);
  		mdoc_node_delete(mdoc, nn);
  	}
  
  	/*
  	 * Nothing to sort if only invalid nodes were found
  	 * inside the `Rs' body.
  	 */
  
  	if (NULL == mdoc->last->child)
  		return(1);
  
  	/*
  	 * The full `Rs' block needs special handling to order the
  	 * sub-elements according to `rsord'.  Pick through each element
  	 * and correctly order it.  This is a insertion sort.
  	 */
  
  	next = NULL;
  	for (nn = mdoc->last->child->next; nn; nn = next) {
  		/* Determine order of `nn'. */
  		for (i = 0; i < RSORD_MAX; i++)
  			if (rsord[i] == nn->tok)
  				break;
  
  		/* 
  		 * Remove `nn' from the chain.  This somewhat
  		 * repeats mdoc_node_unlink(), but since we're
  		 * just re-ordering, there's no need for the
  		 * full unlink process.
  		 */
  		
  		if (NULL != (next = nn->next))
  			next->prev = nn->prev;
  
  		if (NULL != (prev = nn->prev))
  			prev->next = nn->next;
  
  		nn->prev = nn->next = NULL;
  
  		/* 
  		 * Scan back until we reach a node that's
  		 * ordered before `nn'.
  		 */
  
  		for ( ; prev ; prev = prev->prev) {
  			/* Determine order of `prev'. */
  			for (j = 0; j < RSORD_MAX; j++)
  				if (rsord[j] == prev->tok)
  					break;
  
  			if (j <= i)
  				break;
  		}
  
  		/*
  		 * Set `nn' back into its correct place in front
  		 * of the `prev' node.
  		 */
  
  		nn->prev = prev;
  
  		if (prev) {
  			if (prev->next)
  				prev->next->prev = nn;
  			nn->next = prev->next;
  			prev->next = nn;
  		} else {
  			mdoc->last->child->prev = nn;
  			nn->next = mdoc->last->child;
  			mdoc->last->child = nn;
  		}
  	}
  
  	return(1);
  }
  
  static int
  post_ns(POST_ARGS)
  {
  
  	if (MDOC_LINE & mdoc->last->flags)
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_IGNNS);
  	return(1);
  }
  
  static int
  post_sh(POST_ARGS)
  {
  
  	if (MDOC_HEAD == mdoc->last->type)
  		return(post_sh_head(mdoc));
  	if (MDOC_BODY == mdoc->last->type)
  		return(post_sh_body(mdoc));
  
  	return(1);
  }
  
  static int
  post_sh_body(POST_ARGS)
  {
  	struct mdoc_node *n;
  
  	if (SEC_NAME != mdoc->lastsec)
  		return(1);
  
  	/*
  	 * Warn if the NAME section doesn't contain the `Nm' and `Nd'
  	 * macros (can have multiple `Nm' and one `Nd').  Note that the
  	 * children of the BODY declaration can also be "text".
  	 */
  
  	if (NULL == (n = mdoc->last->child)) {
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC);
  		return(1);
  	}
  
  	for ( ; n && n->next; n = n->next) {
  		if (MDOC_ELEM == n->type && MDOC_Nm == n->tok)
  			continue;
  		if (MDOC_TEXT == n->type)
  			continue;
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC);
  	}
  
  	assert(n);
  	if (MDOC_BLOCK == n->type && MDOC_Nd == n->tok)
  		return(1);
  
  	mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC);
  	return(1);
  }
  
  static int
  post_sh_head(POST_ARGS)
  {
  	char		 buf[BUFSIZ];
  	struct mdoc_node *n;
  	enum mdoc_sec	 sec;
  	int		 c;
  
  	/*
  	 * Process a new section.  Sections are either "named" or
  	 * "custom".  Custom sections are user-defined, while named ones
  	 * follow a conventional order and may only appear in certain
  	 * manual sections.
  	 */
  
  	sec = SEC_CUSTOM;
  	buf[0] = '\0';
  	if (-1 == (c = concat(buf, mdoc->last->child, BUFSIZ))) {
  		mdoc_nmsg(mdoc, mdoc->last->child, MANDOCERR_MEM);
  		return(0);
  	} else if (1 == c)
  		sec = a2sec(buf);
  
  	/* The NAME should be first. */
  
  	if (SEC_NAME != sec && SEC_NONE == mdoc->lastnamed)
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NAMESECFIRST);
  
  	/* The SYNOPSIS gets special attention in other areas. */
  
  	if (SEC_SYNOPSIS == sec)
  		mdoc->flags |= MDOC_SYNOPSIS;
  	else
  		mdoc->flags &= ~MDOC_SYNOPSIS;
  
  	/* Mark our last section. */
  
  	mdoc->lastsec = sec;
  
  	/*
  	 * Set the section attribute for the current HEAD, for its
  	 * parent BLOCK, and for the HEAD children; the latter can
  	 * only be TEXT nodes, so no recursion is needed.
  	 * For other blocks and elements, including .Sh BODY, this is
  	 * done when allocating the node data structures, but for .Sh
  	 * BLOCK and HEAD, the section is still unknown at that time.
  	 */
  
  	mdoc->last->parent->sec = sec;
  	mdoc->last->sec = sec;
  	for (n = mdoc->last->child; n; n = n->next)
  		n->sec = sec;
  
  	/* We don't care about custom sections after this. */
  
  	if (SEC_CUSTOM == sec)
  		return(1);
  
  	/*
  	 * Check whether our non-custom section is being repeated or is
  	 * out of order.
  	 */
  
  	if (sec == mdoc->lastnamed)
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECREP);
  
  	if (sec < mdoc->lastnamed)
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECOOO);
  
  	/* Mark the last named section. */
  
  	mdoc->lastnamed = sec;
  
  	/* Check particular section/manual conventions. */
  
  	assert(mdoc->meta.msec);
  
  	switch (sec) {
  	case (SEC_RETURN_VALUES):
  		/* FALLTHROUGH */
  	case (SEC_ERRORS):
  		/* FALLTHROUGH */
  	case (SEC_LIBRARY):
  		if (*mdoc->meta.msec == '2')
  			break;
  		if (*mdoc->meta.msec == '3')
  			break;
  		if (*mdoc->meta.msec == '9')
  			break;
  		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECMSEC);
  		break;
  	default:
  		break;
  	}
  
  	return(1);
  }
  
  static int
  post_ignpar(POST_ARGS)
  {
  	struct mdoc_node *np;
  
  	if (MDOC_BODY != mdoc->last->type)
  		return(1);
  
  	if (NULL != (np = mdoc->last->child))
  		if (MDOC_Pp == np->tok || MDOC_Lp == np->tok) {
  			mdoc_nmsg(mdoc, np, MANDOCERR_IGNPAR);
  			mdoc_node_delete(mdoc, np);
  		}
  
  	if (NULL != (np = mdoc->last->last))
  		if (MDOC_Pp == np->tok || MDOC_Lp == np->tok) {
  			mdoc_nmsg(mdoc, np, MANDOCERR_IGNPAR);
  			mdoc_node_delete(mdoc, np);
  		}
  
  	return(1);
  }
  
  static int
  pre_par(PRE_ARGS)
  {
  
  	if (NULL == mdoc->last)
  		return(1);
  	if (MDOC_ELEM != n->type && MDOC_BLOCK != n->type)
  		return(1);
  
  	/* 
  	 * Don't allow prior `Lp' or `Pp' prior to a paragraph-type
  	 * block:  `Lp', `Pp', or non-compact `Bd' or `Bl'.
  	 */
  
  	if (MDOC_Pp != mdoc->last->tok && MDOC_Lp != mdoc->last->tok)
  		return(1);
  	if (MDOC_Bl == n->tok && n->norm->Bl.comp)
  		return(1);
  	if (MDOC_Bd == n->tok && n->norm->Bd.comp)
  		return(1);
  	if (MDOC_It == n->tok && n->parent->norm->Bl.comp)
  		return(1);
  
  	mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_IGNPAR);
  	mdoc_node_delete(mdoc, mdoc->last);
  	return(1);
  }
  
  static int
  pre_literal(PRE_ARGS)
  {
  
  	if (MDOC_BODY != n->type)
  		return(1);
  
  	/*
  	 * The `Dl' (note "el" not "one") and `Bd -literal' and `Bd
  	 * -unfilled' macros set MDOC_LITERAL on entrance to the body.
  	 */
  
  	switch (n->tok) {
  	case (MDOC_Dl):
  		mdoc->flags |= MDOC_LITERAL;
  		break;
  	case (MDOC_Bd):
  		if (DISP_literal == n->norm->Bd.type)
  			mdoc->flags |= MDOC_LITERAL;
  		if (DISP_unfilled == n->norm->Bd.type)
  			mdoc->flags |= MDOC_LITERAL;
  		break;
  	default:
  		abort();
  		/* NOTREACHED */
  	}
  	
  	return(1);
  }
  
  static int
  post_dd(POST_ARGS)
  {
  	char		  buf[DATESIZE];
  	struct mdoc_node *n;
  	int		  c;
  
  	if (mdoc->meta.date)
  		free(mdoc->meta.date);
  
  	n = mdoc->last;
  	if (NULL == n->child || '\0' == n->child->string[0]) {
  		mdoc->meta.date = mandoc_normdate
  			(mdoc->parse, NULL, n->line, n->pos);
  		return(1);
  	}
  
  	buf[0] = '\0';
  	if (-1 == (c = concat(buf, n->child, DATESIZE))) {
  		mdoc_nmsg(mdoc, n->child, MANDOCERR_MEM);
  		return(0);
  	}
  
  	assert(c);
  	mdoc->meta.date = mandoc_normdate
  		(mdoc->parse, buf, n->line, n->pos);
  
  	return(1);
  }
  
  static int
  post_dt(POST_ARGS)
  {
  	struct mdoc_node *nn, *n;
  	const char	 *cp;
  	char		 *p;
  
  	n = mdoc->last;
  
  	if (mdoc->meta.title)
  		free(mdoc->meta.title);
  	if (mdoc->meta.vol)
  		free(mdoc->meta.vol);
  	if (mdoc->meta.arch)
  		free(mdoc->meta.arch);
  
  	mdoc->meta.title = mdoc->meta.vol = mdoc->meta.arch = NULL;
  
  	/* First make all characters uppercase. */
  
  	if (NULL != (nn = n->child))
  		for (p = nn->string; *p; p++) {
  			if (toupper((unsigned char)*p) == *p)
  				continue;
  
  			/* 
  			 * FIXME: don't be lazy: have this make all
  			 * characters be uppercase and just warn once.
  			 */
  			mdoc_nmsg(mdoc, nn, MANDOCERR_UPPERCASE);
  			break;
  		}
  
  	/* Handles: `.Dt' 
  	 *   --> title = unknown, volume = local, msec = 0, arch = NULL
  	 */
  
  	if (NULL == (nn = n->child)) {
  		/* XXX: make these macro values. */
  		/* FIXME: warn about missing values. */
  		mdoc->meta.title = mandoc_strdup("UNKNOWN");
  		mdoc->meta.vol = mandoc_strdup("LOCAL");
  		mdoc->meta.msec = mandoc_strdup("1");
  		return(1);
  	}
  
  	/* Handles: `.Dt TITLE' 
  	 *   --> title = TITLE, volume = local, msec = 0, arch = NULL
  	 */
  
  	mdoc->meta.title = mandoc_strdup
  		('\0' == nn->string[0] ? "UNKNOWN" : nn->string);
  
  	if (NULL == (nn = nn->next)) {
  		/* FIXME: warn about missing msec. */
  		/* XXX: make this a macro value. */
  		mdoc->meta.vol = mandoc_strdup("LOCAL");
  		mdoc->meta.msec = mandoc_strdup("1");
  		return(1);
  	}
  
  	/* Handles: `.Dt TITLE SEC'
  	 *   --> title = TITLE, volume = SEC is msec ? 
  	 *           format(msec) : SEC,
  	 *       msec = SEC is msec ? atoi(msec) : 0,
  	 *       arch = NULL
  	 */
  
  	cp = mandoc_a2msec(nn->string);
  	if (cp) {
  		mdoc->meta.vol = mandoc_strdup(cp);
  		mdoc->meta.msec = mandoc_strdup(nn->string);
  	} else {
  		mdoc_nmsg(mdoc, n, MANDOCERR_BADMSEC);
  		mdoc->meta.vol = mandoc_strdup(nn->string);
  		mdoc->meta.msec = mandoc_strdup(nn->string);
  	} 
  
  	if (NULL == (nn = nn->next))
  		return(1);
  
  	/* Handles: `.Dt TITLE SEC VOL'
  	 *   --> title = TITLE, volume = VOL is vol ?
  	 *       format(VOL) : 
  	 *           VOL is arch ? format(arch) : 
  	 *               VOL
  	 */
  
  	cp = mdoc_a2vol(nn->string);
  	if (cp) {
  		free(mdoc->meta.vol);
  		mdoc->meta.vol = mandoc_strdup(cp);
  	} else {
  		/* FIXME: warn about bad arch. */
  		cp = mdoc_a2arch(nn->string);
  		if (NULL == cp) {
  			free(mdoc->meta.vol);
  			mdoc->meta.vol = mandoc_strdup(nn->string);
  		} else 
  			mdoc->meta.arch = mandoc_strdup(cp);
  	}	
  
  	/* Ignore any subsequent parameters... */
  	/* FIXME: warn about subsequent parameters. */
  
  	return(1);
  }
  
  static int
  post_prol(POST_ARGS)
  {
  	/*
  	 * Remove prologue macros from the document after they're
  	 * processed.  The final document uses mdoc_meta for these
  	 * values and discards the originals.
  	 */
  
  	mdoc_node_delete(mdoc, mdoc->last);
  	if (mdoc->meta.title && mdoc->meta.date && mdoc->meta.os)
  		mdoc->flags |= MDOC_PBODY;
  
  	return(1);
  }
  
  static int
  post_bx(POST_ARGS)
  {
  	struct mdoc_node	*n;
  
  	/* 
  	 * Make `Bx's second argument always start with an uppercase
  	 * letter.  Groff checks if it's an "accepted" term, but we just
  	 * uppercase blindly.
  	 */
  
  	n = mdoc->last->child;
  	if (n && NULL != (n = n->next))
  		*n->string = (char)toupper
  			((unsigned char)*n->string);
  
  	return(1);
  }
  
  static int
  post_os(POST_ARGS)
  {
  	struct mdoc_node *n;
  	char		  buf[BUFSIZ];
  	int		  c;
  #ifndef OSNAME
  	struct utsname	  utsname;
  #endif
  
  	n = mdoc->last;
  
  	/*
  	 * Set the operating system by way of the `Os' macro.  Note that
  	 * if an argument isn't provided and -DOSNAME="\"foo\"" is
  	 * provided during compilation, this value will be used instead
  	 * of filling in "sysname release" from uname().
   	 */
  
  	if (mdoc->meta.os)
  		free(mdoc->meta.os);
  
  	buf[0] = '\0';
  	if (-1 == (c = concat(buf, n->child, BUFSIZ))) {
  		mdoc_nmsg(mdoc, n->child, MANDOCERR_MEM);
  		return(0);
  	}
  
  	assert(c);
  
  	/* XXX: yes, these can all be dynamically-adjusted buffers, but
  	 * it's really not worth the extra hackery.
  	 */
  
  	if ('\0' == buf[0]) {
  #ifdef OSNAME
  		if (strlcat(buf, OSNAME, BUFSIZ) >= BUFSIZ) {
  			mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
  			return(0);
  		}
  #else /*!OSNAME */
  		if (-1 == uname(&utsname)) {
  			mdoc_nmsg(mdoc, n, MANDOCERR_UNAME);
                          mdoc->meta.os = mandoc_strdup("UNKNOWN");
                          return(post_prol(mdoc));
                  }
  
  		if (strlcat(buf, utsname.sysname, BUFSIZ) >= BUFSIZ) {
  			mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
  			return(0);
  		}
  		if (strlcat(buf, " ", BUFSIZ) >= BUFSIZ) {
  			mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
  			return(0);
  		}
  		if (strlcat(buf, utsname.release, BUFSIZ) >= BUFSIZ) {
  			mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
  			return(0);
  		}
  #endif /*!OSNAME*/
  	}
  
  	mdoc->meta.os = mandoc_strdup(buf);
  	return(1);
  }
  
  static int
  post_std(POST_ARGS)
  {
  	struct mdoc_node *nn, *n;
  
  	n = mdoc->last;
  
  	/*
  	 * Macros accepting `-std' as an argument have the name of the
  	 * current document (`Nm') filled in as the argument if it's not
  	 * provided.
  	 */
  
  	if (n->child)
  		return(1);
  
  	if (NULL == mdoc->meta.name)
  		return(1);
  	
  	nn = n;
  	mdoc->next = MDOC_NEXT_CHILD;
  
  	if ( ! mdoc_word_alloc(mdoc, n->line, n->pos, mdoc->meta.name))
  		return(0);
  
  	mdoc->last = nn;
  	return(1);
  }
  
  /*
   * Concatenate a node, stopping at the first non-text.
   * Concatenation is separated by a single whitespace.  
   * Returns -1 on fatal (string overrun) error, 0 if child nodes were
   * encountered, 1 otherwise.
   */
  static int
  concat(char *p, const struct mdoc_node *n, size_t sz)
  {
  
  	for ( ; NULL != n; n = n->next) {
  		if (MDOC_TEXT != n->type) 
  			return(0);
  		if ('\0' != p[0] && strlcat(p, " ", sz) >= sz)
  			return(-1);
  		if (strlcat(p, n->string, sz) >= sz)
  			return(-1);
  		concat(p, n->child, sz);
  	}
  
  	return(1);
  }
  
  static enum mdoc_sec 
  a2sec(const char *p)
  {
  	int		 i;
  
  	for (i = 0; i < (int)SEC__MAX; i++) 
  		if (secnames[i] && 0 == strcmp(p, secnames[i]))
  			return((enum mdoc_sec)i);
  
  	return(SEC_CUSTOM);
  }
  
  static size_t
  macro2len(enum mdoct macro)
  {
  
  	switch (macro) {
  	case(MDOC_Ad):
  		return(12);
  	case(MDOC_Ao):
  		return(12);
  	case(MDOC_An):
  		return(12);
  	case(MDOC_Aq):
  		return(12);
  	case(MDOC_Ar):
  		return(12);
  	case(MDOC_Bo):
  		return(12);
  	case(MDOC_Bq):
  		return(12);
  	case(MDOC_Cd):
  		return(12);
  	case(MDOC_Cm):
  		return(10);
  	case(MDOC_Do):
  		return(10);
  	case(MDOC_Dq):
  		return(12);
  	case(MDOC_Dv):
  		return(12);
  	case(MDOC_Eo):
  		return(12);
  	case(MDOC_Em):
  		return(10);
  	case(MDOC_Er):
  		return(17);
  	case(MDOC_Ev):
  		return(15);
  	case(MDOC_Fa):
  		return(12);
  	case(MDOC_Fl):
  		return(10);
  	case(MDOC_Fo):
  		return(16);
  	case(MDOC_Fn):
  		return(16);
  	case(MDOC_Ic):
  		return(10);
  	case(MDOC_Li):
  		return(16);
  	case(MDOC_Ms):
  		return(6);
  	case(MDOC_Nm):
  		return(10);
  	case(MDOC_No):
  		return(12);
  	case(MDOC_Oo):
  		return(10);
  	case(MDOC_Op):
  		return(14);
  	case(MDOC_Pa):
  		return(32);
  	case(MDOC_Pf):
  		return(12);
  	case(MDOC_Po):
  		return(12);
  	case(MDOC_Pq):
  		return(12);
  	case(MDOC_Ql):
  		return(16);
  	case(MDOC_Qo):
  		return(12);
  	case(MDOC_So):
  		return(12);
  	case(MDOC_Sq):
  		return(12);
  	case(MDOC_Sy):
  		return(6);
  	case(MDOC_Sx):
  		return(16);
  	case(MDOC_Tn):
  		return(10);
  	case(MDOC_Va):
  		return(12);
  	case(MDOC_Vt):
  		return(12);
  	case(MDOC_Xr):
  		return(10);
  	default:
  		break;
  	};
  	return(0);
  }
  