/* Id: mdoc_validate.c,v 1.389 2021/07/18 11:41:23 schwarze Exp */

/* Id: mdoc_validate.c,v 1.389 2021/07/18 11:41:23 schwarze Exp */
/*
* Copyright (c) 2010-2020 Ingo Schwarze <[email protected]>
* Copyright (c) 2008-2012 Kristaps Dzonsons <[email protected]>
* Copyright (c) 2010 Joerg Sonnenberger <[email protected]>
*
* 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 AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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.
*
* Validation module for mdoc(7) syntax trees used by mandoc(1).
*/
#include "config.h"

#include <sys/types.h>
#ifndef OSNAME
#include <sys/utsname.h>
#endif

#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "mandoc_xr.h"
#include "roff.h"
#include "mdoc.h"
#include "libmandoc.h"
#include "roff_int.h"
#include "libmdoc.h"
#include "tag.h"

/* FIXME: .Bl -diag can't have non-text children in HEAD. */

#define POST_ARGS struct roff_man *mdoc

enum check_ineq {
CHECK_LT,
CHECK_GT,
CHECK_EQ
};

typedef void (*v_post)(POST_ARGS);

static int build_list(struct roff_man *, int);
static void check_argv(struct roff_man *,
struct roff_node *, struct mdoc_argv *);
static void check_args(struct roff_man *, struct roff_node *);
static void check_text(struct roff_man *, int, int, char *);
static void check_text_em(struct roff_man *, int, int, char *);
static void check_toptext(struct roff_man *, int, int, const char *);
static int child_an(const struct roff_node *);
static size_t macro2len(enum roff_tok);
static void rewrite_macro2len(struct roff_man *, char **);
static int similar(const char *, const char *);

static void post_abort(POST_ARGS) __attribute__((__noreturn__));
static void post_an(POST_ARGS);
static void post_an_norm(POST_ARGS);
static void post_at(POST_ARGS);
static void post_bd(POST_ARGS);
static void post_bf(POST_ARGS);
static void post_bk(POST_ARGS);
static void post_bl(POST_ARGS);
static void post_bl_block(POST_ARGS);
static void post_bl_head(POST_ARGS);
static void post_bl_norm(POST_ARGS);
static void post_bx(POST_ARGS);
static void post_defaults(POST_ARGS);
static void post_display(POST_ARGS);
static void post_dd(POST_ARGS);
static void post_delim(POST_ARGS);
static void post_delim_nb(POST_ARGS);
static void post_dt(POST_ARGS);
static void post_em(POST_ARGS);
static void post_en(POST_ARGS);
static void post_er(POST_ARGS);
static void post_es(POST_ARGS);
static void post_eoln(POST_ARGS);
static void post_ex(POST_ARGS);
static void post_fa(POST_ARGS);
static void post_fl(POST_ARGS);
static void post_fn(POST_ARGS);
static void post_fname(POST_ARGS);
static void post_fo(POST_ARGS);
static void post_hyph(POST_ARGS);
static void post_it(POST_ARGS);
static void post_lb(POST_ARGS);
static void post_nd(POST_ARGS);
static void post_nm(POST_ARGS);
static void post_ns(POST_ARGS);
static void post_obsolete(POST_ARGS);
static void post_os(POST_ARGS);
static void post_par(POST_ARGS);
static void post_prevpar(POST_ARGS);
static void post_root(POST_ARGS);
static void post_rs(POST_ARGS);
static void post_rv(POST_ARGS);
static void post_section(POST_ARGS);
static void post_sh(POST_ARGS);
static void post_sh_head(POST_ARGS);
static void post_sh_name(POST_ARGS);
static void post_sh_see_also(POST_ARGS);
static void post_sh_authors(POST_ARGS);
static void post_sm(POST_ARGS);
static void post_st(POST_ARGS);
static void post_std(POST_ARGS);
static void post_sx(POST_ARGS);
static void post_tag(POST_ARGS);
static void post_tg(POST_ARGS);
static void post_useless(POST_ARGS);
static void post_xr(POST_ARGS);
static void post_xx(POST_ARGS);

static const v_post mdoc_valids[MDOC_MAX - MDOC_Dd] = {
post_dd, /* Dd */
post_dt, /* Dt */
post_os, /* Os */
post_sh, /* Sh */
post_section, /* Ss */
post_par, /* Pp */
post_display, /* D1 */
post_display, /* Dl */
post_display, /* Bd */
NULL, /* Ed */
post_bl, /* Bl */
NULL, /* El */
post_it, /* It */
post_delim_nb, /* Ad */
post_an, /* An */
NULL, /* Ap */
post_defaults, /* Ar */
NULL, /* Cd */
post_tag, /* Cm */
post_tag, /* Dv */
post_er, /* Er */
post_tag, /* Ev */
post_ex, /* Ex */
post_fa, /* Fa */
NULL, /* Fd */
post_fl, /* Fl */
post_fn, /* Fn */
post_delim_nb, /* Ft */
post_tag, /* Ic */
post_delim_nb, /* In */
post_tag, /* Li */
post_nd, /* Nd */
post_nm, /* Nm */
post_delim_nb, /* Op */
post_abort, /* Ot */
post_defaults, /* Pa */
post_rv, /* Rv */
post_st, /* St */
post_tag, /* Va */
post_delim_nb, /* Vt */
post_xr, /* Xr */
NULL, /* %A */
post_hyph, /* %B */ /* FIXME: can be used outside Rs/Re. */
NULL, /* %D */
NULL, /* %I */
NULL, /* %J */
post_hyph, /* %N */
post_hyph, /* %O */
NULL, /* %P */
post_hyph, /* %R */
post_hyph, /* %T */ /* FIXME: can be used outside Rs/Re. */
NULL, /* %V */
NULL, /* Ac */
NULL, /* Ao */
post_delim_nb, /* Aq */
post_at, /* At */
NULL, /* Bc */
post_bf, /* Bf */
NULL, /* Bo */
NULL, /* Bq */
post_xx, /* Bsx */
post_bx, /* Bx */
post_obsolete, /* Db */
NULL, /* Dc */
NULL, /* Do */
NULL, /* Dq */
NULL, /* Ec */
NULL, /* Ef */
post_em, /* Em */
NULL, /* Eo */
post_xx, /* Fx */
post_tag, /* Ms */
post_tag, /* No */
post_ns, /* Ns */
post_xx, /* Nx */
post_xx, /* Ox */
NULL, /* Pc */
NULL, /* Pf */
NULL, /* Po */
post_delim_nb, /* Pq */
NULL, /* Qc */
post_delim_nb, /* Ql */
NULL, /* Qo */
post_delim_nb, /* Qq */
NULL, /* Re */
post_rs, /* Rs */
NULL, /* Sc */
NULL, /* So */
post_delim_nb, /* Sq */
post_sm, /* Sm */
post_sx, /* Sx */
post_em, /* Sy */
post_useless, /* Tn */
post_xx, /* Ux */
NULL, /* Xc */
NULL, /* Xo */
post_fo, /* Fo */
NULL, /* Fc */
NULL, /* Oo */
NULL, /* Oc */
post_bk, /* Bk */
NULL, /* Ek */
post_eoln, /* Bt */
post_obsolete, /* Hf */
post_obsolete, /* Fr */
post_eoln, /* Ud */
post_lb, /* Lb */
post_abort, /* Lp */
post_delim_nb, /* Lk */
post_defaults, /* Mt */
post_delim_nb, /* Brq */
NULL, /* Bro */
NULL, /* Brc */
NULL, /* %C */
post_es, /* Es */
post_en, /* En */
post_xx, /* Dx */
NULL, /* %Q */
NULL, /* %U */
NULL, /* Ta */
post_tg, /* Tg */
};

#define RSORD_MAX 14 /* Number of `Rs' blocks. */

static const enum roff_tok rsord[RSORD_MAX] = {
MDOC__A,
MDOC__T,
MDOC__B,
MDOC__I,
MDOC__J,
MDOC__R,
MDOC__N,
MDOC__V,
MDOC__U,
MDOC__P,
MDOC__Q,
MDOC__C,
MDOC__D,
MDOC__O
};

static const char * const secnames[SEC__MAX] = {
NULL,
"NAME",
"LIBRARY",
"SYNOPSIS",
"DESCRIPTION",
"CONTEXT",
"IMPLEMENTATION NOTES",
"RETURN VALUES",
"ENVIRONMENT",
"FILES",
"EXIT STATUS",
"EXAMPLES",
"DIAGNOSTICS",
"COMPATIBILITY",
"ERRORS",
"SEE ALSO",
"STANDARDS",
"HISTORY",
"AUTHORS",
"CAVEATS",
"BUGS",
"SECURITY CONSIDERATIONS",
NULL
};

static int fn_prio = TAG_STRONG;

/* Validate the subtree rooted at mdoc->last. */
void
mdoc_validate(struct roff_man *mdoc)
{
struct roff_node *n, *np;
const v_post *p;

/*
* Translate obsolete macros to modern macros first
* such that later code does not need to look
* for the obsolete versions.
*/

n = mdoc->last;
switch (n->tok) {
case MDOC_Lp:
n->tok = MDOC_Pp;
break;
case MDOC_Ot:
post_obsolete(mdoc);
n->tok = MDOC_Ft;
break;
default:
break;
}

/*
* Iterate over all children, recursing into each one
* in turn, depth-first.
*/

mdoc->last = mdoc->last->child;
while (mdoc->last != NULL) {
mdoc_validate(mdoc);
if (mdoc->last == n)
mdoc->last = mdoc->last->child;
else
mdoc->last = mdoc->last->next;
}

/* Finally validate the macro itself. */

mdoc->last = n;
mdoc->next = ROFF_NEXT_SIBLING;
switch (n->type) {
case ROFFT_TEXT:
np = n->parent;
if (n->sec != SEC_SYNOPSIS ||
(np->tok != MDOC_Cd && np->tok != MDOC_Fd))
check_text(mdoc, n->line, n->pos, n->string);
if ((n->flags & NODE_NOFILL) == 0 &&
(np->tok != MDOC_It || np->type != ROFFT_HEAD ||
np->parent->parent->norm->Bl.type != LIST_diag))
check_text_em(mdoc, n->line, n->pos, n->string);
if (np->tok == MDOC_It || (np->type == ROFFT_BODY &&
(np->tok == MDOC_Sh || np->tok == MDOC_Ss)))
check_toptext(mdoc, n->line, n->pos, n->string);
break;
case ROFFT_COMMENT:
case ROFFT_EQN:
case ROFFT_TBL:
break;
case ROFFT_ROOT:
post_root(mdoc);
break;
default:
check_args(mdoc, mdoc->last);

/*
* Closing delimiters are not special at the
* beginning of a block, opening delimiters
* are not special at the end.
*/

if (n->child != NULL)
n->child->flags &= ~NODE_DELIMC;
if (n->last != NULL)
n->last->flags &= ~NODE_DELIMO;

/* Call the macro's postprocessor. */

if (n->tok < ROFF_MAX) {
roff_validate(mdoc);
break;
}

assert(n->tok >= MDOC_Dd && n->tok < MDOC_MAX);
p = mdoc_valids + (n->tok - MDOC_Dd);
if (*p)
(*p)(mdoc);
if (mdoc->last == n)
mdoc_state(mdoc, n);
break;
}
}

static void
check_args(struct roff_man *mdoc, struct roff_node *n)
{
int i;

if (NULL == n->args)
return;

assert(n->args->argc);
for (i = 0; i < (int)n->args->argc; i++)
check_argv(mdoc, n, &n->args->argv[i]);
}

static void
check_argv(struct roff_man *mdoc, struct roff_node *n, struct mdoc_argv *v)
{
int i;

for (i = 0; i < (int)v->sz; i++)
check_text(mdoc, v->line, v->pos, v->value[i]);
}

static void
check_text(struct roff_man *mdoc, int ln, int pos, char *p)
{
char *cp;

if (mdoc->last->flags & NODE_NOFILL)
return;

for (cp = p; NULL != (p = strchr(p, '\t')); p++)
mandoc_msg(MANDOCERR_FI_TAB, ln, pos + (int)(p - cp), NULL);
}

static void
check_text_em(struct roff_man *mdoc, int ln, int pos, char *p)
{
const struct roff_node *np, *nn;
char *cp;

np = mdoc->last->prev;
nn = mdoc->last->next;

/* Look for em-dashes wrongly encoded as "--". */

for (cp = p; *cp != '\0'; cp++) {
if (cp[0] != '-' || cp[1] != '-')
continue;
cp++;

/* Skip input sequences of more than two '-'. */

if (cp[1] == '-') {
while (cp[1] == '-')
cp++;
continue;
}

/* Skip "--" directly attached to something else. */

if ((cp - p > 1 && cp[-2] != ' ') ||
(cp[1] != '\0' && cp[1] != ' '))
continue;

/* Require a letter right before or right afterwards. */

if ((cp - p > 2 ?
isalpha((unsigned char)cp[-3]) :
np != NULL &&
np->type == ROFFT_TEXT &&
*np->string != '\0' &&
isalpha((unsigned char)np->string[
strlen(np->string) - 1])) ||
(cp[1] != '\0' && cp[2] != '\0' ?
isalpha((unsigned char)cp[2]) :
nn != NULL &&
nn->type == ROFFT_TEXT &&
isalpha((unsigned char)*nn->string))) {
mandoc_msg(MANDOCERR_DASHDASH,
ln, pos + (int)(cp - p) - 1, NULL);
break;
}
}
}

static void
check_toptext(struct roff_man *mdoc, int ln, int pos, const char *p)
{
const char *cp, *cpr;

if (*p == '\0')
return;

if ((cp = strstr(p, "OpenBSD")) != NULL)
mandoc_msg(MANDOCERR_BX, ln, pos + (int)(cp - p), "Ox");
if ((cp = strstr(p, "NetBSD")) != NULL)
mandoc_msg(MANDOCERR_BX, ln, pos + (int)(cp - p), "Nx");
if ((cp = strstr(p, "FreeBSD")) != NULL)
mandoc_msg(MANDOCERR_BX, ln, pos + (int)(cp - p), "Fx");
if ((cp = strstr(p, "DragonFly")) != NULL)
mandoc_msg(MANDOCERR_BX, ln, pos + (int)(cp - p), "Dx");

cp = p;
while ((cp = strstr(cp + 1, "()")) != NULL) {
for (cpr = cp - 1; cpr >= p; cpr--)
if (*cpr != '_' && !isalnum((unsigned char)*cpr))
break;
if ((cpr < p || *cpr == ' ') && cpr + 1 < cp) {
cpr++;
mandoc_msg(MANDOCERR_FUNC, ln, pos + (int)(cpr - p),
"%.*s()", (int)(cp - cpr), cpr);
}
}
}

static void
post_abort(POST_ARGS)
{
abort();
}

static void
post_delim(POST_ARGS)
{
const struct roff_node *nch;
const char *lc;
enum mdelim delim;
enum roff_tok tok;

tok = mdoc->last->tok;
nch = mdoc->last->last;
if (nch == NULL || nch->type != ROFFT_TEXT)
return;
lc = strchr(nch->string, '\0') - 1;
if (lc < nch->string)
return;
delim = mdoc_isdelim(lc);
if (delim == DELIM_NONE || delim == DELIM_OPEN)
return;
if (*lc == ')' && (tok == MDOC_Nd || tok == MDOC_Sh ||
tok == MDOC_Ss || tok == MDOC_Fo))
return;

mandoc_msg(MANDOCERR_DELIM, nch->line,
nch->pos + (int)(lc - nch->string), "%s%s %s", roff_name[tok],
nch == mdoc->last->child ? "" : " ...", nch->string);
}

static void
post_delim_nb(POST_ARGS)
{
const struct roff_node *nch;
const char *lc, *cp;
int nw;
enum mdelim delim;
enum roff_tok tok;

/*
* Find candidates: at least two bytes,
* the last one a closing or middle delimiter.
*/

tok = mdoc->last->tok;
nch = mdoc->last->last;
if (nch == NULL || nch->type != ROFFT_TEXT)
return;
lc = strchr(nch->string, '\0') - 1;
if (lc <= nch->string)
return;
delim = mdoc_isdelim(lc);
if (delim == DELIM_NONE || delim == DELIM_OPEN)
return;

/*
* Reduce false positives by allowing various cases.
*/

/* Escaped delimiters. */
if (lc > nch->string + 1 && lc[-2] == '\\' &&
(lc[-1] == '&' || lc[-1] == 'e'))
return;

/* Specific byte sequences. */
switch (*lc) {
case ')':
for (cp = lc; cp >= nch->string; cp--)
if (*cp == '(')
return;
break;
case '.':
if (lc > nch->string + 1 && lc[-2] == '.' && lc[-1] == '.')
return;
if (lc[-1] == '.')
return;
break;
case ';':
if (tok == MDOC_Vt)
return;
break;
case '?':
if (lc[-1] == '?')
return;
break;
case ']':
for (cp = lc; cp >= nch->string; cp--)
if (*cp == '[')
return;
break;
case '|':
if (lc == nch->string + 1 && lc[-1] == '|')
return;
default:
break;
}

/* Exactly two non-alphanumeric bytes. */
if (lc == nch->string + 1 && !isalnum((unsigned char)lc[-1]))
return;

/* At least three alphabetic words with a sentence ending. */
if (strchr("!.:?", *lc) != NULL && (tok == MDOC_Em ||
tok == MDOC_Li || tok == MDOC_Pq || tok == MDOC_Sy)) {
nw = 0;
for (cp = lc - 1; cp >= nch->string; cp--) {
if (*cp == ' ') {
nw++;
if (cp > nch->string && cp[-1] == ',')
cp--;
} else if (isalpha((unsigned int)*cp)) {
if (nw > 1)
return;
} else
break;
}
}

mandoc_msg(MANDOCERR_DELIM_NB, nch->line,
nch->pos + (int)(lc - nch->string), "%s%s %s", roff_name[tok],
nch == mdoc->last->child ? "" : " ...", nch->string);
}

static void
post_bl_norm(POST_ARGS)
{
struct roff_node *n;
struct mdoc_argv *argv, *wa;
int i;
enum mdocargt mdoclt;
enum mdoc_list lt;

n = mdoc->last->parent;
n->norm->Bl.type = LIST__NONE;

/*
* 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.
*/

wa = (n->args == NULL) ? NULL : n->args->argv;
mdoclt = MDOC_ARG_MAX;
for (i = 0; n->args && i < (int)n->args->argc; i++) {
argv = n->args->argv + i;
lt = LIST__NONE;
switch (argv->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:
if (n->norm->Bl.comp)
mandoc_msg(MANDOCERR_ARG_REP,
argv->line, argv->pos, "Bl -compact");
n->norm->Bl.comp = 1;
break;
case MDOC_Width:
wa = argv;
if (0 == argv->sz) {
mandoc_msg(MANDOCERR_ARG_EMPTY,
argv->line, argv->pos, "Bl -width");
n->norm->Bl.width = "0n";
break;
}
if (NULL != n->norm->Bl.width)
mandoc_msg(MANDOCERR_ARG_REP,
argv->line, argv->pos,
"Bl -width %s", argv->value[0]);
rewrite_macro2len(mdoc, argv->value);
n->norm->Bl.width = argv->value[0];
break;
case MDOC_Offset:
if (0 == argv->sz) {
mandoc_msg(MANDOCERR_ARG_EMPTY,
argv->line, argv->pos, "Bl -offset");
break;
}
if (NULL != n->norm->Bl.offs)
mandoc_msg(MANDOCERR_ARG_REP,
argv->line, argv->pos,
"Bl -offset %s", argv->value[0]);
rewrite_macro2len(mdoc, argv->value);
n->norm->Bl.offs = argv->value[0];
break;
default:
continue;
}
if (LIST__NONE == lt)
continue;
mdoclt = argv->arg;

/* Check: multiple list types. */

if (LIST__NONE != n->norm->Bl.type) {
mandoc_msg(MANDOCERR_BL_REP, n->line, n->pos,
"Bl -%s", mdoc_argnames[argv->arg]);
continue;
}

/* The list type should come first. */

if (n->norm->Bl.width ||
n->norm->Bl.offs ||
n->norm->Bl.comp)
mandoc_msg(MANDOCERR_BL_LATETYPE,
n->line, n->pos, "Bl -%s",
mdoc_argnames[n->args->argv[0].arg]);

n->norm->Bl.type = lt;
if (LIST_column == lt) {
n->norm->Bl.ncols = argv->sz;
n->norm->Bl.cols = (void *)argv->value;
}
}

/* Allow lists to default to LIST_item. */

if (LIST__NONE == n->norm->Bl.type) {
mandoc_msg(MANDOCERR_BL_NOTYPE, n->line, n->pos, "Bl");
n->norm->Bl.type = LIST_item;
mdoclt = MDOC_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. Yet others have a default and need
* no warning.
*/

switch (n->norm->Bl.type) {
case LIST_tag:
if (n->norm->Bl.width == NULL)
mandoc_msg(MANDOCERR_BL_NOWIDTH,
n->line, n->pos, "Bl -tag");
break;
case LIST_column:
case LIST_diag:
case LIST_ohang:
case LIST_inset:
case LIST_item:
if (n->norm->Bl.width != NULL)
mandoc_msg(MANDOCERR_BL_SKIPW, wa->line, wa->pos,
"Bl -%s", mdoc_argnames[mdoclt]);
n->norm->Bl.width = NULL;
break;
case LIST_bullet:
case LIST_dash:
case LIST_hyphen:
if (n->norm->Bl.width == NULL)
n->norm->Bl.width = "2n";
break;
case LIST_enum:
if (n->norm->Bl.width == NULL)
n->norm->Bl.width = "3n";
break;
default:
break;
}
}

static void
post_bd(POST_ARGS)
{
struct roff_node *n;
struct mdoc_argv *argv;
int i;
enum mdoc_disp dt;

n = mdoc->last;
for (i = 0; n->args && i < (int)n->args->argc; i++) {
argv = n->args->argv + i;
dt = DISP__NONE;

switch (argv->arg) {
case MDOC_Centred:
dt = DISP_centered;
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:
mandoc_msg(MANDOCERR_BD_FILE, n->line, n->pos, NULL);
break;
case MDOC_Offset:
if (0 == argv->sz) {
mandoc_msg(MANDOCERR_ARG_EMPTY,
argv->line, argv->pos, "Bd -offset");
break;
}
if (NULL != n->norm->Bd.offs)
mandoc_msg(MANDOCERR_ARG_REP,
argv->line, argv->pos,
"Bd -offset %s", argv->value[0]);
rewrite_macro2len(mdoc, argv->value);
n->norm->Bd.offs = argv->value[0];
break;
case MDOC_Compact:
if (n->norm->Bd.comp)
mandoc_msg(MANDOCERR_ARG_REP,
argv->line, argv->pos, "Bd -compact");
n->norm->Bd.comp = 1;
break;
default:
abort();
}
if (DISP__NONE == dt)
continue;

if (DISP__NONE == n->norm->Bd.type)
n->norm->Bd.type = dt;
else
mandoc_msg(MANDOCERR_BD_REP, n->line, n->pos,
"Bd -%s", mdoc_argnames[argv->arg]);
}

if (DISP__NONE == n->norm->Bd.type) {
mandoc_msg(MANDOCERR_BD_NOTYPE, n->line, n->pos, "Bd");
n->norm->Bd.type = DISP_ragged;
}
}

/*
* Stand-alone line macros.
*/

static void
post_an_norm(POST_ARGS)
{
struct roff_node *n;
struct mdoc_argv *argv;
size_t i;

n = mdoc->last;
if (n->args == NULL)
return;

for (i = 1; i < n->args->argc; i++) {
argv = n->args->argv + i;
mandoc_msg(MANDOCERR_AN_REP, argv->line, argv->pos,
"An -%s", mdoc_argnames[argv->arg]);
}

argv = n->args->argv;
if (argv->arg == MDOC_Split)
n->norm->An.auth = AUTH_split;
else if (argv->arg == MDOC_Nosplit)
n->norm->An.auth = AUTH_nosplit;
else
abort();
}

static void
post_eoln(POST_ARGS)
{
struct roff_node *n;

post_useless(mdoc);
n = mdoc->last;
if (n->child != NULL)
mandoc_msg(MANDOCERR_ARG_SKIP, n->line,
n->pos, "%s %s", roff_name[n->tok], n->child->string);

while (n->child != NULL)
roff_node_delete(mdoc, n->child);

roff_word_alloc(mdoc, n->line, n->pos, n->tok == MDOC_Bt ?
"is currently in beta test." : "currently under development.");
mdoc->last->flags |= NODE_EOS | NODE_NOSRC;
mdoc->last = n;
}

static int
build_list(struct roff_man *mdoc, int tok)
{
struct roff_node *n;
int ic;

n = mdoc->last->next;
for (ic = 1;; ic++) {
roff_elem_alloc(mdoc, n->line, n->pos, tok);
mdoc->last->flags |= NODE_NOSRC;
roff_node_relink(mdoc, n);
n = mdoc->last = mdoc->last->parent;
mdoc->next = ROFF_NEXT_SIBLING;
if (n->next == NULL)
return ic;
if (ic > 1 || n->next->next != NULL) {
roff_word_alloc(mdoc, n->line, n->pos, ",");
mdoc->last->flags |= NODE_DELIMC | NODE_NOSRC;
}
n = mdoc->last->next;
if (n->next == NULL) {
roff_word_alloc(mdoc, n->line, n->pos, "and");
mdoc->last->flags |= NODE_NOSRC;
}
}
}

static void
post_ex(POST_ARGS)
{
struct roff_node *n;
int ic;

post_std(mdoc);

n = mdoc->last;
mdoc->next = ROFF_NEXT_CHILD;
roff_word_alloc(mdoc, n->line, n->pos, "The");
mdoc->last->flags |= NODE_NOSRC;

if (mdoc->last->next != NULL)
ic = build_list(mdoc, MDOC_Nm);
else if (mdoc->meta.name != NULL) {
roff_elem_alloc(mdoc, n->line, n->pos, MDOC_Nm);
mdoc->last->flags |= NODE_NOSRC;
roff_word_alloc(mdoc, n->line, n->pos, mdoc->meta.name);
mdoc->last->flags |= NODE_NOSRC;
mdoc->last = mdoc->last->parent;
mdoc->next = ROFF_NEXT_SIBLING;
ic = 1;
} else {
mandoc_msg(MANDOCERR_EX_NONAME, n->line, n->pos, "Ex");
ic = 0;
}

roff_word_alloc(mdoc, n->line, n->pos,
ic > 1 ? "utilities exit\\~0" : "utility exits\\~0");
mdoc->last->flags |= NODE_NOSRC;
roff_word_alloc(mdoc, n->line, n->pos,
"on success, and\\~>0 if an error occurs.");
mdoc->last->flags |= NODE_EOS | NODE_NOSRC;
mdoc->last = n;
}

static void
post_lb(POST_ARGS)
{
struct roff_node *n;
const char *p;

post_delim_nb(mdoc);

n = mdoc->last;
assert(n->child->type == ROFFT_TEXT);
mdoc->next = ROFF_NEXT_CHILD;

if ((p = mdoc_a2lib(n->child->string)) != NULL) {
n->child->flags |= NODE_NOPRT;
roff_word_alloc(mdoc, n->line, n->pos, p);
mdoc->last->flags = NODE_NOSRC;
mdoc->last = n;
return;
}

mandoc_msg(MANDOCERR_LB_BAD, n->child->line,
n->child->pos, "Lb %s", n->child->string);

roff_word_alloc(mdoc, n->line, n->pos, "library");
mdoc->last->flags = NODE_NOSRC;
roff_word_alloc(mdoc, n->line, n->pos, "\\(lq");
mdoc->last->flags = NODE_DELIMO | NODE_NOSRC;
mdoc->last = mdoc->last->next;
roff_word_alloc(mdoc, n->line, n->pos, "\\(rq");
mdoc->last->flags = NODE_DELIMC | NODE_NOSRC;
mdoc->last = n;
}

static void
post_rv(POST_ARGS)
{
struct roff_node *n;
int ic;

post_std(mdoc);

n = mdoc->last;
mdoc->next = ROFF_NEXT_CHILD;
if (n->child != NULL) {
roff_word_alloc(mdoc, n->line, n->pos, "The");
mdoc->last->flags |= NODE_NOSRC;
ic = build_list(mdoc, MDOC_Fn);
roff_word_alloc(mdoc, n->line, n->pos,
ic > 1 ? "functions return" : "function returns");
mdoc->last->flags |= NODE_NOSRC;
roff_word_alloc(mdoc, n->line, n->pos,
"the value\\~0 if successful;");
} else
roff_word_alloc(mdoc, n->line, n->pos, "Upon successful "
"completion, the value\\~0 is returned;");
mdoc->last->flags |= NODE_NOSRC;

roff_word_alloc(mdoc, n->line, n->pos, "otherwise "
"the value\\~\\-1 is returned and the global variable");
mdoc->last->flags |= NODE_NOSRC;
roff_elem_alloc(mdoc, n->line, n->pos, MDOC_Va);
mdoc->last->flags |= NODE_NOSRC;
roff_word_alloc(mdoc, n->line, n->pos, "errno");
mdoc->last->flags |= NODE_NOSRC;
mdoc->last = mdoc->last->parent;
mdoc->next = ROFF_NEXT_SIBLING;
roff_word_alloc(mdoc, n->line, n->pos,
"is set to indicate the error.");
mdoc->last->flags |= NODE_EOS | NODE_NOSRC;
mdoc->last = n;
}

static void
post_std(POST_ARGS)
{
struct roff_node *n;

post_delim(mdoc);

n = mdoc->last;
if (n->args && n->args->argc == 1)
if (n->args->argv[0].arg == MDOC_Std)
return;

mandoc_msg(MANDOCERR_ARG_STD, n->line, n->pos,
"%s", roff_name[n->tok]);
}

static void
post_st(POST_ARGS)
{
struct roff_node *n, *nch;
const char *p;

n = mdoc->last;
nch = n->child;
assert(nch->type == ROFFT_TEXT);

if ((p = mdoc_a2st(nch->string)) == NULL) {
mandoc_msg(MANDOCERR_ST_BAD,
nch->line, nch->pos, "St %s", nch->string);
roff_node_delete(mdoc, n);
return;
}

nch->flags |= NODE_NOPRT;
mdoc->next = ROFF_NEXT_CHILD;
roff_word_alloc(mdoc, nch->line, nch->pos, p);
mdoc->last->flags |= NODE_NOSRC;
mdoc->last= n;
}

static void
post_tg(POST_ARGS)
{
struct roff_node *n; /* The .Tg node. */
struct roff_node *nch; /* The first child of the .Tg node. */
struct roff_node *nn; /* The next node after the .Tg node. */
struct roff_node *np; /* The parent of the next node. */
struct roff_node *nt; /* The TEXT node containing the tag. */
size_t len; /* The number of bytes in the tag. */

/* Find the next node. */
n = mdoc->last;
for (nn = n; nn != NULL; nn = nn->parent) {
if (nn->next != NULL) {
nn = nn->next;
break;
}
}

/* Find the tag. */
nt = nch = n->child;
if (nch == NULL && nn != NULL && nn->child != NULL &&
nn->child->type == ROFFT_TEXT)
nt = nn->child;

/* Validate the tag. */
if (nt == NULL || *nt->string == '\0')
mandoc_msg(MANDOCERR_MACRO_EMPTY, n->line, n->pos, "Tg");
if (nt == NULL) {
roff_node_delete(mdoc, n);
return;
}
len = strcspn(nt->string, " \t\\");
if (nt->string[len] != '\0')
mandoc_msg(MANDOCERR_TG_SPC, nt->line,
nt->pos + len, "Tg %s", nt->string);

/* Keep only the first argument. */
if (nch != NULL && nch->next != NULL) {
mandoc_msg(MANDOCERR_ARG_EXCESS, nch->next->line,
nch->next->pos, "Tg ... %s", nch->next->string);
while (nch->next != NULL)
roff_node_delete(mdoc, nch->next);
}

/* Drop the macro if the first argument is invalid. */
if (len == 0 || nt->string[len] != '\0') {
roff_node_delete(mdoc, n);
return;
}

/* By default, tag the .Tg node itself. */
if (nn == NULL || nn->flags & NODE_ID)
nn = n;

/* Explicit tagging of specific macros. */
switch (nn->tok) {
case MDOC_Sh:
case MDOC_Ss:
case MDOC_Fo:
nn = nn->head->child == NULL ? n : nn->head;
break;
case MDOC_It:
np = nn->parent;
while (np->tok != MDOC_Bl)
np = np->parent;
switch (np->norm->Bl.type) {
case LIST_column:
break;
case LIST_diag:
case LIST_hang:
case LIST_inset:
case LIST_ohang:
case LIST_tag:
nn = nn->head;
break;
case LIST_bullet:
case LIST_dash:
case LIST_enum:
case LIST_hyphen:
case LIST_item:
nn = nn->body->child == NULL ? n : nn->body;
break;
default:
abort();
}
break;
case MDOC_Bd:
case MDOC_Bl:
case MDOC_D1:
case MDOC_Dl:
nn = nn->body->child == NULL ? n : nn->body;
break;
case MDOC_Pp:
break;
case MDOC_Cm:
case MDOC_Dv:
case MDOC_Em:
case MDOC_Er:
case MDOC_Ev:
case MDOC_Fl:
case MDOC_Fn:
case MDOC_Ic:
case MDOC_Li:
case MDOC_Ms:
case MDOC_No:
case MDOC_Sy:
if (nn->child == NULL)
nn = n;
break;
default:
nn = n;
break;
}
tag_put(nt->string, TAG_MANUAL, nn);
if (nn != n)
n->flags |= NODE_NOPRT;
}

static void
post_obsolete(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;
if (n->type == ROFFT_ELEM || n->type == ROFFT_BLOCK)
mandoc_msg(MANDOCERR_MACRO_OBS, n->line, n->pos,
"%s", roff_name[n->tok]);
}

static void
post_useless(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;
mandoc_msg(MANDOCERR_MACRO_USELESS, n->line, n->pos,
"%s", roff_name[n->tok]);
}

/*
* Block macros.
*/

static void
post_bf(POST_ARGS)
{
struct roff_node *np, *nch;

/*
* Unlike other data pointers, these are "housed" by the HEAD
* element, which contains the goods.
*/

np = mdoc->last;
if (np->type != ROFFT_HEAD)
return;

assert(np->parent->type == ROFFT_BLOCK);
assert(np->parent->tok == MDOC_Bf);

/* Check the number of arguments. */

nch = np->child;
if (np->parent->args == NULL) {
if (nch == NULL) {
mandoc_msg(MANDOCERR_BF_NOFONT,
np->line, np->pos, "Bf");
return;
}
nch = nch->next;
}
if (nch != NULL)
mandoc_msg(MANDOCERR_ARG_EXCESS,
nch->line, nch->pos, "Bf ... %s", nch->string);

/* Extract argument into data. */

if (np->parent->args != NULL) {
switch (np->parent->args->argv[0].arg) {
case MDOC_Emphasis:
np->norm->Bf.font = FONT_Em;
break;
case MDOC_Literal:
np->norm->Bf.font = FONT_Li;
break;
case MDOC_Symbolic:
np->norm->Bf.font = FONT_Sy;
break;
default:
abort();
}
return;
}

/* Extract parameter into data. */

if ( ! strcmp(np->child->string, "Em"))
np->norm->Bf.font = FONT_Em;
else if ( ! strcmp(np->child->string, "Li"))
np->norm->Bf.font = FONT_Li;
else if ( ! strcmp(np->child->string, "Sy"))
np->norm->Bf.font = FONT_Sy;
else
mandoc_msg(MANDOCERR_BF_BADFONT, np->child->line,
np->child->pos, "Bf %s", np->child->string);
}

static void
post_fname(POST_ARGS)
{
struct roff_node *n, *nch;
const char *cp;
size_t pos;

n = mdoc->last;
nch = n->child;
cp = nch->string;
if (*cp == '(') {
if (cp[strlen(cp + 1)] == ')')
return;
pos = 0;
} else {
pos = strcspn(cp, "()");
if (cp[pos] == '\0') {
if (n->sec == SEC_DESCRIPTION ||
n->sec == SEC_CUSTOM)
tag_put(NULL, fn_prio++, n);
return;
}
}
mandoc_msg(MANDOCERR_FN_PAREN, nch->line, nch->pos + pos, "%s", cp);
}

static void
post_fn(POST_ARGS)
{
post_fname(mdoc);
post_fa(mdoc);
}

static void
post_fo(POST_ARGS)
{
const struct roff_node *n;

n = mdoc->last;

if (n->type != ROFFT_HEAD)
return;

if (n->child == NULL) {
mandoc_msg(MANDOCERR_FO_NOHEAD, n->line, n->pos, "Fo");
return;
}
if (n->child != n->last) {
mandoc_msg(MANDOCERR_ARG_EXCESS,
n->child->next->line, n->child->next->pos,
"Fo ... %s", n->child->next->string);
while (n->child != n->last) {
struct roff_node *p = n->last;
roff_node_delete(mdoc, p);
}

} else
post_delim(mdoc);

post_fname(mdoc);
}

static void
post_fa(POST_ARGS)
{
const struct roff_node *n;
const char *cp;

for (n = mdoc->last->child; n != NULL; n = n->next) {
for (cp = n->string; *cp != '\0'; cp++) {
/* Ignore callbacks and alterations. */
if (*cp == '(' || *cp == '{')
break;
if (*cp != ',')
continue;
mandoc_msg(MANDOCERR_FA_COMMA, n->line,
n->pos + (int)(cp - n->string), "%s", n->string);
break;
}
}
post_delim_nb(mdoc);
}

static void
post_nm(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;

if (n->sec == SEC_NAME && n->child != NULL &&
n->child->type == ROFFT_TEXT && mdoc->meta.msec != NULL)
mandoc_xr_add(mdoc->meta.msec, n->child->string, -1, -1);

if (n->last != NULL && n->last->tok == MDOC_Pp)
roff_node_relink(mdoc, n->last);

if (mdoc->meta.name == NULL)
deroff(&mdoc->meta.name, n);

if (mdoc->meta.name == NULL ||
(mdoc->lastsec == SEC_NAME && n->child == NULL))
mandoc_msg(MANDOCERR_NM_NONAME, n->line, n->pos, "Nm");

switch (n->type) {
case ROFFT_ELEM:
post_delim_nb(mdoc);
break;
case ROFFT_HEAD:
post_delim(mdoc);
break;
default:
return;
}

if ((n->child != NULL && n->child->type == ROFFT_TEXT) ||
mdoc->meta.name == NULL)
return;

mdoc->next = ROFF_NEXT_CHILD;
roff_word_alloc(mdoc, n->line, n->pos, mdoc->meta.name);
mdoc->last->flags |= NODE_NOSRC;
mdoc->last = n;
}

static void
post_nd(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;

if (n->type != ROFFT_BODY)
return;

if (n->sec != SEC_NAME)
mandoc_msg(MANDOCERR_ND_LATE, n->line, n->pos, "Nd");

if (n->child == NULL)
mandoc_msg(MANDOCERR_ND_EMPTY, n->line, n->pos, "Nd");
else
post_delim(mdoc);

post_hyph(mdoc);
}

static void
post_display(POST_ARGS)
{
struct roff_node *n, *np;

n = mdoc->last;
switch (n->type) {
case ROFFT_BODY:
if (n->end != ENDBODY_NOT) {
if (n->tok == MDOC_Bd &&
n->body->parent->args == NULL)
roff_node_delete(mdoc, n);
} else if (n->child == NULL)
mandoc_msg(MANDOCERR_BLK_EMPTY, n->line, n->pos,
"%s", roff_name[n->tok]);
else if (n->tok == MDOC_D1)
post_hyph(mdoc);
break;
case ROFFT_BLOCK:
if (n->tok == MDOC_Bd) {
if (n->args == NULL) {
mandoc_msg(MANDOCERR_BD_NOARG,
n->line, n->pos, "Bd");
mdoc->next = ROFF_NEXT_SIBLING;
while (n->body->child != NULL)
roff_node_relink(mdoc,
n->body->child);
roff_node_delete(mdoc, n);
break;
}
post_bd(mdoc);
post_prevpar(mdoc);
}
for (np = n->parent; np != NULL; np = np->parent) {
if (np->type == ROFFT_BLOCK && np->tok == MDOC_Bd) {
mandoc_msg(MANDOCERR_BD_NEST, n->line,
n->pos, "%s in Bd", roff_name[n->tok]);
break;
}
}
break;
default:
break;
}
}

static void
post_defaults(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;
if (n->child != NULL) {
post_delim_nb(mdoc);
return;
}
mdoc->next = ROFF_NEXT_CHILD;
switch (n->tok) {
case MDOC_Ar:
roff_word_alloc(mdoc, n->line, n->pos, "file");
mdoc->last->flags |= NODE_NOSRC;
roff_word_alloc(mdoc, n->line, n->pos, "...");
break;
case MDOC_Pa:
case MDOC_Mt:
roff_word_alloc(mdoc, n->line, n->pos, "~");
break;
default:
abort();
}
mdoc->last->flags |= NODE_NOSRC;
mdoc->last = n;
}

static void
post_at(POST_ARGS)
{
struct roff_node *n, *nch;
const char *att;

n = mdoc->last;
nch = n->child;

/*
* 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.
*/

att = NULL;
if (nch != NULL && ((att = mdoc_a2att(nch->string)) == NULL))
mandoc_msg(MANDOCERR_AT_BAD,
nch->line, nch->pos, "At %s", nch->string);

mdoc->next = ROFF_NEXT_CHILD;
if (att != NULL) {
roff_word_alloc(mdoc, nch->line, nch->pos, att);
nch->flags |= NODE_NOPRT;
} else
roff_word_alloc(mdoc, n->line, n->pos, "AT&T UNIX");
mdoc->last->flags |= NODE_NOSRC;
mdoc->last = n;
}

static void
post_an(POST_ARGS)
{
struct roff_node *np, *nch;

post_an_norm(mdoc);

np = mdoc->last;
nch = np->child;
if (np->norm->An.auth == AUTH__NONE) {
if (nch == NULL)
mandoc_msg(MANDOCERR_MACRO_EMPTY,
np->line, np->pos, "An");
else
post_delim_nb(mdoc);
} else if (nch != NULL)
mandoc_msg(MANDOCERR_ARG_EXCESS,
nch->line, nch->pos, "An ... %s", nch->string);
}

static void
post_em(POST_ARGS)
{
post_tag(mdoc);
tag_put(NULL, TAG_FALLBACK, mdoc->last);
}

static void
post_en(POST_ARGS)
{
post_obsolete(mdoc);
if (mdoc->last->type == ROFFT_BLOCK)
mdoc->last->norm->Es = mdoc->last_es;
}

static void
post_er(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;
if (n->sec == SEC_ERRORS &&
(n->parent->tok == MDOC_It ||
(n->parent->tok == MDOC_Bq &&
n->parent->parent->parent->tok == MDOC_It)))
tag_put(NULL, TAG_STRONG, n);
post_delim_nb(mdoc);
}

static void
post_tag(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;
if ((n->prev == NULL ||
(n->prev->type == ROFFT_TEXT &&
strcmp(n->prev->string, "|") == 0)) &&
(n->parent->tok == MDOC_It ||
(n->parent->tok == MDOC_Xo &&
n->parent->parent->prev == NULL &&
n->parent->parent->parent->tok == MDOC_It)))
tag_put(NULL, TAG_STRONG, n);
post_delim_nb(mdoc);
}

static void
post_es(POST_ARGS)
{
post_obsolete(mdoc);
mdoc->last_es = mdoc->last;
}

static void
post_fl(POST_ARGS)
{
struct roff_node *n;
char *cp;

/*
* Transform ".Fl Fl long" to ".Fl \-long",
* resulting for example in better HTML output.
*/

n = mdoc->last;
if (n->prev != NULL && n->prev->tok == MDOC_Fl &&
n->prev->child == NULL && n->child != NULL &&
(n->flags & NODE_LINE) == 0) {
mandoc_asprintf(&cp, "\\-%s", n->child->string);
free(n->child->string);
n->child->string = cp;
roff_node_delete(mdoc, n->prev);
}
post_tag(mdoc);
}

static void
post_xx(POST_ARGS)
{
struct roff_node *n;
const char *os;
char *v;

post_delim_nb(mdoc);

n = mdoc->last;
switch (n->tok) {
case MDOC_Bsx:
os = "BSD/OS";
break;
case MDOC_Dx:
os = "DragonFly";
break;
case MDOC_Fx:
os = "FreeBSD";
break;
case MDOC_Nx:
os = "NetBSD";
if (n->child == NULL)
break;
v = n->child->string;
if ((v[0] != '0' && v[0] != '1') || v[1] != '.' ||
v[2] < '0' || v[2] > '9' ||
v[3] < 'a' || v[3] > 'z' || v[4] != '\0')
break;
n->child->flags |= NODE_NOPRT;
mdoc->next = ROFF_NEXT_CHILD;
roff_word_alloc(mdoc, n->child->line, n->child->pos, v);
v = mdoc->last->string;
v[3] = toupper((unsigned char)v[3]);
mdoc->last->flags |= NODE_NOSRC;
mdoc->last = n;
break;
case MDOC_Ox:
os = "OpenBSD";
break;
case MDOC_Ux:
os = "UNIX";
break;
default:
abort();
}
mdoc->next = ROFF_NEXT_CHILD;
roff_word_alloc(mdoc, n->line, n->pos, os);
mdoc->last->flags |= NODE_NOSRC;
mdoc->last = n;
}

static void
post_it(POST_ARGS)
{
struct roff_node *nbl, *nit, *nch;
int i, cols;
enum mdoc_list lt;

post_prevpar(mdoc);

nit = mdoc->last;
if (nit->type != ROFFT_BLOCK)
return;

nbl = nit->parent->parent;
lt = nbl->norm->Bl.type;

switch (lt) {
case LIST_tag:
case LIST_hang:
case LIST_ohang:
case LIST_inset:
case LIST_diag:
if (nit->head->child == NULL)
mandoc_msg(MANDOCERR_IT_NOHEAD,
nit->line, nit->pos, "Bl -%s It",
mdoc_argnames[nbl->args->argv[0].arg]);
break;
case LIST_bullet:
case LIST_dash:
case LIST_enum:
case LIST_hyphen:
if (nit->body == NULL || nit->body->child == NULL)
mandoc_msg(MANDOCERR_IT_NOBODY,
nit->line, nit->pos, "Bl -%s It",
mdoc_argnames[nbl->args->argv[0].arg]);
/* FALLTHROUGH */
case LIST_item:
if ((nch = nit->head->child) != NULL)
mandoc_msg(MANDOCERR_ARG_SKIP,
nit->line, nit->pos, "It %s",
nch->type == ROFFT_TEXT ? nch->string :
roff_name[nch->tok]);
break;
case LIST_column:
cols = (int)nbl->norm->Bl.ncols;

assert(nit->head->child == NULL);

if (nit->head->next->child == NULL &&
nit->head->next->next == NULL) {
mandoc_msg(MANDOCERR_MACRO_EMPTY,
nit->line, nit->pos, "It");
roff_node_delete(mdoc, nit);
break;
}

i = 0;
for (nch = nit->child; nch != NULL; nch = nch->next) {
if (nch->type != ROFFT_BODY)
continue;
if (i++ && nch->flags & NODE_LINE)
mandoc_msg(MANDOCERR_TA_LINE,
nch->line, nch->pos, "Ta");
}
if (i < cols || i > cols + 1)
mandoc_msg(MANDOCERR_BL_COL, nit->line, nit->pos,
"%d columns, %d cells", cols, i);
else if (nit->head->next->child != NULL &&
nit->head->next->child->flags & NODE_LINE)
mandoc_msg(MANDOCERR_IT_NOARG,
nit->line, nit->pos, "Bl -column It");
break;
default:
abort();
}
}

static void
post_bl_block(POST_ARGS)
{
struct roff_node *n, *ni, *nc;

post_prevpar(mdoc);

n = mdoc->last;
for (ni = n->body->child; ni != NULL; ni = ni->next) {
if (ni->body == NULL)
continue;
nc = ni->body->last;
while (nc != NULL) {
switch (nc->tok) {
case MDOC_Pp:
case ROFF_br:
break;
default:
nc = NULL;
continue;
}
if (ni->next == NULL) {
mandoc_msg(MANDOCERR_PAR_MOVE, nc->line,
nc->pos, "%s", roff_name[nc->tok]);
roff_node_relink(mdoc, nc);
} else if (n->norm->Bl.comp == 0 &&
n->norm->Bl.type != LIST_column) {
mandoc_msg(MANDOCERR_PAR_SKIP,
nc->line, nc->pos,
"%s before It", roff_name[nc->tok]);
roff_node_delete(mdoc, nc);
} else
break;
nc = ni->body->last;
}
}
}

/*
* If the argument of -offset or -width is a macro,
* replace it with the associated default width.
*/
static void
rewrite_macro2len(struct roff_man *mdoc, char **arg)
{
size_t width;
enum roff_tok tok;

if (*arg == NULL)
return;
else if ( ! strcmp(*arg, "Ds"))
width = 6;
else if ((tok = roffhash_find(mdoc->mdocmac, *arg, 0)) == TOKEN_NONE)
return;
else
width = macro2len(tok);

free(*arg);
mandoc_asprintf(arg, "%zun", width);
}

static void
post_bl_head(POST_ARGS)
{
struct roff_node *nbl, *nh, *nch, *nnext;
struct mdoc_argv *argv;
int i, j;

post_bl_norm(mdoc);

nh = mdoc->last;
if (nh->norm->Bl.type != LIST_column) {
if ((nch = nh->child) == NULL)
return;
mandoc_msg(MANDOCERR_ARG_EXCESS,
nch->line, nch->pos, "Bl ... %s", nch->string);
while (nch != NULL) {
roff_node_delete(mdoc, nch);
nch = nh->child;
}
return;
}

/*
* Append 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.
*/

if (nh->child == NULL)
return;

nbl = nh->parent;
for (j = 0; j < (int)nbl->args->argc; j++)
if (nbl->args->argv[j].arg == MDOC_Column)
break;

assert(j < (int)nbl->args->argc);

/*
* 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.
*/

argv = nbl->args->argv + j;
i = argv->sz;
for (nch = nh->child; nch != NULL; nch = nch->next)
argv->sz++;
argv->value = mandoc_reallocarray(argv->value,
argv->sz, sizeof(char *));

nh->norm->Bl.ncols = argv->sz;
nh->norm->Bl.cols = (void *)argv->value;

for (nch = nh->child; nch != NULL; nch = nnext) {
argv->value[i++] = nch->string;
nch->string = NULL;
nnext = nch->next;
roff_node_delete(NULL, nch);
}
nh->child = NULL;
}

static void
post_bl(POST_ARGS)
{
struct roff_node *nbody; /* of the Bl */
struct roff_node *nchild, *nnext; /* of the Bl body */
const char *prev_Er;
int order;

nbody = mdoc->last;
switch (nbody->type) {
case ROFFT_BLOCK:
post_bl_block(mdoc);
return;
case ROFFT_HEAD:
post_bl_head(mdoc);
return;
case ROFFT_BODY:
break;
default:
return;
}
if (nbody->end != ENDBODY_NOT)
return;

/*
* Up to the first item, move nodes before the list,
* but leave transparent nodes where they are
* if they precede an item.
* The next non-transparent node is kept in nchild.
* It only needs to be updated after a non-transparent
* node was moved out, and at the very beginning
* when no node at all was moved yet.
*/

nchild = mdoc->last;
for (;;) {
if (nchild == mdoc->last)
nchild = roff_node_child(nbody);
if (nchild == NULL) {
mdoc->last = nbody;
mandoc_msg(MANDOCERR_BLK_EMPTY,
nbody->line, nbody->pos, "Bl");
return;
}
if (nchild->tok == MDOC_It) {
mdoc->last = nbody;
break;
}
mandoc_msg(MANDOCERR_BL_MOVE, nbody->child->line,
nbody->child->pos, "%s", roff_name[nbody->child->tok]);
if (nbody->parent->prev == NULL) {
mdoc->last = nbody->parent->parent;
mdoc->next = ROFF_NEXT_CHILD;
} else {
mdoc->last = nbody->parent->prev;
mdoc->next = ROFF_NEXT_SIBLING;
}
roff_node_relink(mdoc, nbody->child);
}

/*
* We have reached the first item,
* so moving nodes out is no longer possible.
* But in .Bl -column, the first rows may be implicit,
* that is, they may not start with .It macros.
* Such rows may be followed by nodes generated on the
* roff level, for example .TS.
* Wrap such roff nodes into an implicit row.
*/

while (nchild != NULL) {
if (nchild->tok == MDOC_It) {
nchild = roff_node_next(nchild);
continue;
}
nnext = nchild->next;
mdoc->last = nchild->prev;
mdoc->next = ROFF_NEXT_SIBLING;
roff_block_alloc(mdoc, nchild->line, nchild->pos, MDOC_It);
roff_head_alloc(mdoc, nchild->line, nchild->pos, MDOC_It);
mdoc->next = ROFF_NEXT_SIBLING;
roff_body_alloc(mdoc, nchild->line, nchild->pos, MDOC_It);
while (nchild->tok != MDOC_It) {
roff_node_relink(mdoc, nchild);
if (nnext == NULL)
break;
nchild = nnext;
nnext = nchild->next;
mdoc->next = ROFF_NEXT_SIBLING;
}
mdoc->last = nbody;
}

if (mdoc->meta.os_e != MANDOC_OS_NETBSD)
return;

prev_Er = NULL;
for (nchild = nbody->child; nchild != NULL; nchild = nchild->next) {
if (nchild->tok != MDOC_It)
continue;
if ((nnext = nchild->head->child) == NULL)
continue;
if (nnext->type == ROFFT_BLOCK)
nnext = nnext->body->child;
if (nnext == NULL || nnext->tok != MDOC_Er)
continue;
nnext = nnext->child;
if (prev_Er != NULL) {
order = strcmp(prev_Er, nnext->string);
if (order > 0)
mandoc_msg(MANDOCERR_ER_ORDER,
nnext->line, nnext->pos,
"Er %s %s (NetBSD)",
prev_Er, nnext->string);
else if (order == 0)
mandoc_msg(MANDOCERR_ER_REP,
nnext->line, nnext->pos,
"Er %s (NetBSD)", prev_Er);
}
prev_Er = nnext->string;
}
}

static void
post_bk(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;

if (n->type == ROFFT_BLOCK && n->body->child == NULL) {
mandoc_msg(MANDOCERR_BLK_EMPTY, n->line, n->pos, "Bk");
roff_node_delete(mdoc, n);
}
}

static void
post_sm(POST_ARGS)
{
struct roff_node *nch;

nch = mdoc->last->child;

if (nch == NULL) {
mdoc->flags ^= MDOC_SMOFF;
return;
}

assert(nch->type == ROFFT_TEXT);

if ( ! strcmp(nch->string, "on")) {
mdoc->flags &= ~MDOC_SMOFF;
return;
}
if ( ! strcmp(nch->string, "off")) {
mdoc->flags |= MDOC_SMOFF;
return;
}

mandoc_msg(MANDOCERR_SM_BAD, nch->line, nch->pos,
"%s %s", roff_name[mdoc->last->tok], nch->string);
roff_node_relink(mdoc, nch);
return;
}

static void
post_root(POST_ARGS)
{
struct roff_node *n;

/* Add missing prologue data. */

if (mdoc->meta.date == NULL)
mdoc->meta.date = mandoc_normdate(NULL, NULL);

if (mdoc->meta.title == NULL) {
mandoc_msg(MANDOCERR_DT_NOTITLE, 0, 0, "EOF");
mdoc->meta.title = mandoc_strdup("UNTITLED");
}

if (mdoc->meta.vol == NULL)
mdoc->meta.vol = mandoc_strdup("LOCAL");

if (mdoc->meta.os == NULL) {
mandoc_msg(MANDOCERR_OS_MISSING, 0, 0, NULL);
mdoc->meta.os = mandoc_strdup("");
} else if (mdoc->meta.os_e &&
(mdoc->meta.rcsids & (1 << mdoc->meta.os_e)) == 0)
mandoc_msg(MANDOCERR_RCS_MISSING, 0, 0,
mdoc->meta.os_e == MANDOC_OS_OPENBSD ?
"(OpenBSD)" : "(NetBSD)");

if (mdoc->meta.arch != NULL &&
arch_valid(mdoc->meta.arch, mdoc->meta.os_e) == 0) {
n = mdoc->meta.first->child;
while (n->tok != MDOC_Dt ||
n->child == NULL ||
n->child->next == NULL ||
n->child->next->next == NULL)
n = n->next;
n = n->child->next->next;
mandoc_msg(MANDOCERR_ARCH_BAD, n->line, n->pos,
"Dt ... %s %s", mdoc->meta.arch,
mdoc->meta.os_e == MANDOC_OS_OPENBSD ?
"(OpenBSD)" : "(NetBSD)");
}

/* Check that we begin with a proper `Sh'. */

n = mdoc->meta.first->child;
while (n != NULL &&
(n->type == ROFFT_COMMENT ||
(n->tok >= MDOC_Dd &&
mdoc_macro(n->tok)->flags & MDOC_PROLOGUE)))
n = n->next;

if (n == NULL)
mandoc_msg(MANDOCERR_DOC_EMPTY, 0, 0, NULL);
else if (n->tok != MDOC_Sh)
mandoc_msg(MANDOCERR_SEC_BEFORE, n->line, n->pos,
"%s", roff_name[n->tok]);
}

static void
post_rs(POST_ARGS)
{
struct roff_node *np, *nch, *next, *prev;
int i, j;

np = mdoc->last;

if (np->type != ROFFT_BODY)
return;

if (np->child == NULL) {
mandoc_msg(MANDOCERR_RS_EMPTY, np->line, np->pos, "Rs");
return;
}

/*
* 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 an insertion sort.
*/

next = NULL;
for (nch = np->child->next; nch != NULL; nch = next) {
/* Determine order number of this child. */
for (i = 0; i < RSORD_MAX; i++)
if (rsord[i] == nch->tok)
break;

if (i == RSORD_MAX) {
mandoc_msg(MANDOCERR_RS_BAD, nch->line, nch->pos,
"%s", roff_name[nch->tok]);
i = -1;
} else if (nch->tok == MDOC__J || nch->tok == MDOC__B)
np->norm->Rs.quote_T++;

/*
* Remove this child from the chain. This somewhat
* repeats roff_node_unlink(), but since we're
* just re-ordering, there's no need for the
* full unlink process.
*/

if ((next = nch->next) != NULL)
next->prev = nch->prev;

if ((prev = nch->prev) != NULL)
prev->next = nch->next;

nch->prev = nch->next = NULL;

/*
* Scan back until we reach a node that's
* to be ordered before this child.
*/

for ( ; prev ; prev = prev->prev) {
/* Determine order of `prev'. */
for (j = 0; j < RSORD_MAX; j++)
if (rsord[j] == prev->tok)
break;
if (j == RSORD_MAX)
j = -1;

if (j <= i)
break;
}

/*
* Set this child back into its correct place
* in front of the `prev' node.
*/

nch->prev = prev;

if (prev == NULL) {
np->child->prev = nch;
nch->next = np->child;
np->child = nch;
} else {
if (prev->next)
prev->next->prev = nch;
nch->next = prev->next;
prev->next = nch;
}
}
}

/*
* For some arguments of some macros,
* convert all breakable hyphens into ASCII_HYPH.
*/
static void
post_hyph(POST_ARGS)
{
struct roff_node *n, *nch;
char *cp;

n = mdoc->last;
for (nch = n->child; nch != NULL; nch = nch->next) {
if (nch->type != ROFFT_TEXT)
continue;
cp = nch->string;
if (*cp == '\0')
continue;
while (*(++cp) != '\0')
if (*cp == '-' &&
isalpha((unsigned char)cp[-1]) &&
isalpha((unsigned char)cp[1])) {
if (n->tag == NULL && n->flags & NODE_ID)
n->tag = mandoc_strdup(nch->string);
*cp = ASCII_HYPH;
}
}
}

static void
post_ns(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;
if (n->flags & NODE_LINE ||
(n->next != NULL && n->next->flags & NODE_DELIMC))
mandoc_msg(MANDOCERR_NS_SKIP, n->line, n->pos, NULL);
}

static void
post_sx(POST_ARGS)
{
post_delim(mdoc);
post_hyph(mdoc);
}

static void
post_sh(POST_ARGS)
{
post_section(mdoc);

switch (mdoc->last->type) {
case ROFFT_HEAD:
post_sh_head(mdoc);
break;
case ROFFT_BODY:
switch (mdoc->lastsec) {
case SEC_NAME:
post_sh_name(mdoc);
break;
case SEC_SEE_ALSO:
post_sh_see_also(mdoc);
break;
case SEC_AUTHORS:
post_sh_authors(mdoc);
break;
default:
break;
}
break;
default:
break;
}
}

static void
post_sh_name(POST_ARGS)
{
struct roff_node *n;
int hasnm, hasnd;

hasnm = hasnd = 0;

for (n = mdoc->last->child; n != NULL; n = n->next) {
switch (n->tok) {
case MDOC_Nm:
if (hasnm && n->child != NULL)
mandoc_msg(MANDOCERR_NAMESEC_PUNCT,
n->line, n->pos,
"Nm %s", n->child->string);
hasnm = 1;
continue;
case MDOC_Nd:
hasnd = 1;
if (n->next != NULL)
mandoc_msg(MANDOCERR_NAMESEC_ND,
n->line, n->pos, NULL);
break;
case TOKEN_NONE:
if (n->type == ROFFT_TEXT &&
n->string[0] == ',' && n->string[1] == '\0' &&
n->next != NULL && n->next->tok == MDOC_Nm) {
n = n->next;
continue;
}
/* FALLTHROUGH */
default:
mandoc_msg(MANDOCERR_NAMESEC_BAD,
n->line, n->pos, "%s", roff_name[n->tok]);
continue;
}
break;
}

if ( ! hasnm)
mandoc_msg(MANDOCERR_NAMESEC_NONM,
mdoc->last->line, mdoc->last->pos, NULL);
if ( ! hasnd)
mandoc_msg(MANDOCERR_NAMESEC_NOND,
mdoc->last->line, mdoc->last->pos, NULL);
}

static void
post_sh_see_also(POST_ARGS)
{
const struct roff_node *n;
const char *name, *sec;
const char *lastname, *lastsec, *lastpunct;
int cmp;

n = mdoc->last->child;
lastname = lastsec = lastpunct = NULL;
while (n != NULL) {
if (n->tok != MDOC_Xr ||
n->child == NULL ||
n->child->next == NULL)
break;

/* Process one .Xr node. */

name = n->child->string;
sec = n->child->next->string;
if (lastsec != NULL) {
if (lastpunct[0] != ',' || lastpunct[1] != '\0')
mandoc_msg(MANDOCERR_XR_PUNCT, n->line,
n->pos, "%s before %s(%s)",
lastpunct, name, sec);
cmp = strcmp(lastsec, sec);
if (cmp > 0)
mandoc_msg(MANDOCERR_XR_ORDER, n->line,
n->pos, "%s(%s) after %s(%s)",
name, sec, lastname, lastsec);
else if (cmp == 0 &&
strcasecmp(lastname, name) > 0)
mandoc_msg(MANDOCERR_XR_ORDER, n->line,
n->pos, "%s after %s", name, lastname);
}
lastname = name;
lastsec = sec;

/* Process the following node. */

n = n->next;
if (n == NULL)
break;
if (n->tok == MDOC_Xr) {
lastpunct = "none";
continue;
}
if (n->type != ROFFT_TEXT)
break;
for (name = n->string; *name != '\0'; name++)
if (isalpha((const unsigned char)*name))
return;
lastpunct = n->string;
if (n->next == NULL || n->next->tok == MDOC_Rs)
mandoc_msg(MANDOCERR_XR_PUNCT, n->line,
n->pos, "%s after %s(%s)",
lastpunct, lastname, lastsec);
n = n->next;
}
}

static int
child_an(const struct roff_node *n)
{

for (n = n->child; n != NULL; n = n->next)
if ((n->tok == MDOC_An && n->child != NULL) || child_an(n))
return 1;
return 0;
}

static void
post_sh_authors(POST_ARGS)
{

if ( ! child_an(mdoc->last))
mandoc_msg(MANDOCERR_AN_MISSING,
mdoc->last->line, mdoc->last->pos, NULL);
}

/*
* Return an upper bound for the string distance (allowing
* transpositions). Not a full Levenshtein implementation
* because Levenshtein is quadratic in the string length
* and this function is called for every standard name,
* so the check for each custom name would be cubic.
* The following crude heuristics is linear, resulting
* in quadratic behaviour for checking one custom name,
* which does not cause measurable slowdown.
*/
static int
similar(const char *s1, const char *s2)
{
const int maxdist = 3;
int dist = 0;

while (s1[0] != '\0' && s2[0] != '\0') {
if (s1[0] == s2[0]) {
s1++;
s2++;
continue;
}
if (++dist > maxdist)
return INT_MAX;
if (s1[1] == s2[1]) { /* replacement */
s1++;
s2++;
} else if (s1[0] == s2[1] && s1[1] == s2[0]) {
s1 += 2; /* transposition */
s2 += 2;
} else if (s1[0] == s2[1]) /* insertion */
s2++;
else if (s1[1] == s2[0]) /* deletion */
s1++;
else
return INT_MAX;
}
dist += strlen(s1) + strlen(s2);
return dist > maxdist ? INT_MAX : dist;
}

static void
post_sh_head(POST_ARGS)
{
struct roff_node *nch;
const char *goodsec;
const char *const *testsec;
int dist, mindist;
enum roff_sec sec;

/*
* 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 = mdoc->last->sec;

/* The NAME should be first. */

if (sec != SEC_NAME && mdoc->lastnamed == SEC_NONE)
mandoc_msg(MANDOCERR_NAMESEC_FIRST,
mdoc->last->line, mdoc->last->pos, "Sh %s",
sec != SEC_CUSTOM ? secnames[sec] :
(nch = mdoc->last->child) == NULL ? "" :
nch->type == ROFFT_TEXT ? nch->string :
roff_name[nch->tok]);

/* The SYNOPSIS gets special attention in other areas. */

if (sec == SEC_SYNOPSIS) {
roff_setreg(mdoc->roff, "nS", 1, '=');
mdoc->flags |= MDOC_SYNOPSIS;
} else {
roff_setreg(mdoc->roff, "nS", 0, '=');
mdoc->flags &= ~MDOC_SYNOPSIS;
}
if (sec == SEC_DESCRIPTION)
fn_prio = TAG_STRONG;

/* Mark our last section. */

mdoc->lastsec = sec;

/* We don't care about custom sections after this. */

if (sec == SEC_CUSTOM) {
if ((nch = mdoc->last->child) == NULL ||
nch->type != ROFFT_TEXT || nch->next != NULL)
return;
goodsec = NULL;
mindist = INT_MAX;
for (testsec = secnames + 1; *testsec != NULL; testsec++) {
dist = similar(nch->string, *testsec);
if (dist < mindist) {
goodsec = *testsec;
mindist = dist;
}
}
if (goodsec != NULL)
mandoc_msg(MANDOCERR_SEC_TYPO, nch->line, nch->pos,
"Sh %s instead of %s", nch->string, goodsec);
return;
}

/*
* Check whether our non-custom section is being repeated or is
* out of order.
*/

if (sec == mdoc->lastnamed)
mandoc_msg(MANDOCERR_SEC_REP, mdoc->last->line,
mdoc->last->pos, "Sh %s", secnames[sec]);

if (sec < mdoc->lastnamed)
mandoc_msg(MANDOCERR_SEC_ORDER, mdoc->last->line,
mdoc->last->pos, "Sh %s", secnames[sec]);

/* Mark the last named section. */

mdoc->lastnamed = sec;

/* Check particular section/manual conventions. */

if (mdoc->meta.msec == NULL)
return;

goodsec = NULL;
switch (sec) {
case SEC_ERRORS:
if (*mdoc->meta.msec == '4')
break;
goodsec = "2, 3, 4, 9";
/* FALLTHROUGH */
case SEC_RETURN_VALUES:
case SEC_LIBRARY:
if (*mdoc->meta.msec == '2')
break;
if (*mdoc->meta.msec == '3')
break;
if (NULL == goodsec)
goodsec = "2, 3, 9";
/* FALLTHROUGH */
case SEC_CONTEXT:
if (*mdoc->meta.msec == '9')
break;
if (NULL == goodsec)
goodsec = "9";
mandoc_msg(MANDOCERR_SEC_MSEC,
mdoc->last->line, mdoc->last->pos,
"Sh %s for %s only", secnames[sec], goodsec);
break;
default:
break;
}
}

static void
post_xr(POST_ARGS)
{
struct roff_node *n, *nch;

n = mdoc->last;
nch = n->child;
if (nch->next == NULL) {
mandoc_msg(MANDOCERR_XR_NOSEC,
n->line, n->pos, "Xr %s", nch->string);
} else {
assert(nch->next == n->last);
if(mandoc_xr_add(nch->next->string, nch->string,
nch->line, nch->pos))
mandoc_msg(MANDOCERR_XR_SELF,
nch->line, nch->pos, "Xr %s %s",
nch->string, nch->next->string);
}
post_delim_nb(mdoc);
}

static void
post_section(POST_ARGS)
{
struct roff_node *n, *nch;
char *cp, *tag;

n = mdoc->last;
switch (n->type) {
case ROFFT_BLOCK:
post_prevpar(mdoc);
return;
case ROFFT_HEAD:
tag = NULL;
deroff(&tag, n);
if (tag != NULL) {
for (cp = tag; *cp != '\0'; cp++)
if (*cp == ' ')
*cp = '_';
if ((nch = n->child) != NULL &&
nch->type == ROFFT_TEXT &&
strcmp(nch->string, tag) == 0)
tag_put(NULL, TAG_STRONG, n);
else
tag_put(tag, TAG_FALLBACK, n);
free(tag);
}
post_delim(mdoc);
post_hyph(mdoc);
return;
case ROFFT_BODY:
break;
default:
return;
}
if ((nch = n->child) != NULL &&
(nch->tok == MDOC_Pp || nch->tok == ROFF_br ||
nch->tok == ROFF_sp)) {
mandoc_msg(MANDOCERR_PAR_SKIP, nch->line, nch->pos,
"%s after %s", roff_name[nch->tok],
roff_name[n->tok]);
roff_node_delete(mdoc, nch);
}
if ((nch = n->last) != NULL &&
(nch->tok == MDOC_Pp || nch->tok == ROFF_br)) {
mandoc_msg(MANDOCERR_PAR_SKIP, nch->line, nch->pos,
"%s at the end of %s", roff_name[nch->tok],
roff_name[n->tok]);
roff_node_delete(mdoc, nch);
}
}

static void
post_prevpar(POST_ARGS)
{
struct roff_node *n, *np;

n = mdoc->last;
if (n->type != ROFFT_ELEM && n->type != ROFFT_BLOCK)
return;
if ((np = roff_node_prev(n)) == NULL)
return;

/*
* Don't allow `Pp' prior to a paragraph-type
* block: `Pp' or non-compact `Bd' or `Bl'.
*/

if (np->tok != MDOC_Pp && np->tok != ROFF_br)
return;
if (n->tok == MDOC_Bl && n->norm->Bl.comp)
return;
if (n->tok == MDOC_Bd && n->norm->Bd.comp)
return;
if (n->tok == MDOC_It && n->parent->norm->Bl.comp)
return;

mandoc_msg(MANDOCERR_PAR_SKIP, np->line, np->pos,
"%s before %s", roff_name[np->tok], roff_name[n->tok]);
roff_node_delete(mdoc, np);
}

static void
post_par(POST_ARGS)
{
struct roff_node *np;

fn_prio = TAG_STRONG;
post_prevpar(mdoc);

np = mdoc->last;
if (np->child != NULL)
mandoc_msg(MANDOCERR_ARG_SKIP, np->line, np->pos,
"%s %s", roff_name[np->tok], np->child->string);
}

static void
post_dd(POST_ARGS)
{
struct roff_node *n;

n = mdoc->last;
n->flags |= NODE_NOPRT;

if (mdoc->meta.date != NULL) {
mandoc_msg(MANDOCERR_PROLOG_REP, n->line, n->pos, "Dd");
free(mdoc->meta.date);
} else if (mdoc->flags & MDOC_PBODY)
mandoc_msg(MANDOCERR_PROLOG_LATE, n->line, n->pos, "Dd");
else if (mdoc->meta.title != NULL)
mandoc_msg(MANDOCERR_PROLOG_ORDER,
n->line, n->pos, "Dd after Dt");
else if (mdoc->meta.os != NULL)
mandoc_msg(MANDOCERR_PROLOG_ORDER,
n->line, n->pos, "Dd after Os");

if (mdoc->quick && n != NULL)
mdoc->meta.date = mandoc_strdup("");
else
mdoc->meta.date = mandoc_normdate(n->child, n);
}

static void
post_dt(POST_ARGS)
{
struct roff_node *nn, *n;
const char *cp;
char *p;

n = mdoc->last;
n->flags |= NODE_NOPRT;

if (mdoc->flags & MDOC_PBODY) {
mandoc_msg(MANDOCERR_DT_LATE, n->line, n->pos, "Dt");
return;
}

if (mdoc->meta.title != NULL)
mandoc_msg(MANDOCERR_PROLOG_REP, n->line, n->pos, "Dt");
else if (mdoc->meta.os != NULL)
mandoc_msg(MANDOCERR_PROLOG_ORDER,
n->line, n->pos, "Dt after Os");

free(mdoc->meta.title);
free(mdoc->meta.msec);
free(mdoc->meta.vol);
free(mdoc->meta.arch);

mdoc->meta.title = NULL;
mdoc->meta.msec = NULL;
mdoc->meta.vol = NULL;
mdoc->meta.arch = NULL;

/* Mandatory first argument: title. */

nn = n->child;
if (nn == NULL || *nn->string == '\0') {
mandoc_msg(MANDOCERR_DT_NOTITLE, n->line, n->pos, "Dt");
mdoc->meta.title = mandoc_strdup("UNTITLED");
} else {
mdoc->meta.title = mandoc_strdup(nn->string);

/* Check that all characters are uppercase. */

for (p = nn->string; *p != '\0'; p++)
if (islower((unsigned char)*p)) {
mandoc_msg(MANDOCERR_TITLE_CASE, nn->line,
nn->pos + (int)(p - nn->string),
"Dt %s", nn->string);
break;
}
}

/* Mandatory second argument: section. */

if (nn != NULL)
nn = nn->next;

if (nn == NULL) {
mandoc_msg(MANDOCERR_MSEC_MISSING, n->line, n->pos,
"Dt %s", mdoc->meta.title);
mdoc->meta.vol = mandoc_strdup("LOCAL");
return; /* msec and arch remain NULL. */
}

mdoc->meta.msec = mandoc_strdup(nn->string);

/* Infer volume title from section number. */

cp = mandoc_a2msec(nn->string);
if (cp == NULL) {
mandoc_msg(MANDOCERR_MSEC_BAD,
nn->line, nn->pos, "Dt ... %s", nn->string);
mdoc->meta.vol = mandoc_strdup(nn->string);
} else {
mdoc->meta.vol = mandoc_strdup(cp);
if (mdoc->filesec != '\0' &&
mdoc->filesec != *nn->string &&
*nn->string >= '1' && *nn->string <= '9')
mandoc_msg(MANDOCERR_MSEC_FILE, nn->line, nn->pos,
"*.%c vs Dt ... %c", mdoc->filesec, *nn->string);
}

/* Optional third argument: architecture. */

if ((nn = nn->next) == NULL)
return;

for (p = nn->string; *p != '\0'; p++)
*p = tolower((unsigned char)*p);
mdoc->meta.arch = mandoc_strdup(nn->string);

/* Ignore fourth and later arguments. */

if ((nn = nn->next) != NULL)
mandoc_msg(MANDOCERR_ARG_EXCESS,
nn->line, nn->pos, "Dt ... %s", nn->string);
}

static void
post_bx(POST_ARGS)
{
struct roff_node *n, *nch;
const char *macro;

post_delim_nb(mdoc);

n = mdoc->last;
nch = n->child;

if (nch != NULL) {
macro = !strcmp(nch->string, "Open") ? "Ox" :
!strcmp(nch->string, "Net") ? "Nx" :
!strcmp(nch->string, "Free") ? "Fx" :
!strcmp(nch->string, "DragonFly") ? "Dx" : NULL;
if (macro != NULL)
mandoc_msg(MANDOCERR_BX,
n->line, n->pos, "%s", macro);
mdoc->last = nch;
nch = nch->next;
mdoc->next = ROFF_NEXT_SIBLING;
roff_elem_alloc(mdoc, n->line, n->pos, MDOC_Ns);
mdoc->last->flags |= NODE_NOSRC;
mdoc->next = ROFF_NEXT_SIBLING;
} else
mdoc->next = ROFF_NEXT_CHILD;
roff_word_alloc(mdoc, n->line, n->pos, "BSD");
mdoc->last->flags |= NODE_NOSRC;

if (nch == NULL) {
mdoc->last = n;
return;
}

roff_elem_alloc(mdoc, n->line, n->pos, MDOC_Ns);
mdoc->last->flags |= NODE_NOSRC;
mdoc->next = ROFF_NEXT_SIBLING;
roff_word_alloc(mdoc, n->line, n->pos, "-");
mdoc->last->flags |= NODE_NOSRC;
roff_elem_alloc(mdoc, n->line, n->pos, MDOC_Ns);
mdoc->last->flags |= NODE_NOSRC;
mdoc->last = 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.
*/

*nch->string = (char)toupper((unsigned char)*nch->string);
}

static void
post_os(POST_ARGS)
{
#ifndef OSNAME
struct utsname utsname;
static char *defbuf;
#endif
struct roff_node *n;

n = mdoc->last;
n->flags |= NODE_NOPRT;

if (mdoc->meta.os != NULL)
mandoc_msg(MANDOCERR_PROLOG_REP, n->line, n->pos, "Os");
else if (mdoc->flags & MDOC_PBODY)
mandoc_msg(MANDOCERR_PROLOG_LATE, n->line, n->pos, "Os");

post_delim(mdoc);

/*
* Set the operating system by way of the `Os' macro.
* The order of precedence is:
* 1. the argument of the `Os' macro, unless empty
* 2. the -Ios=foo command line argument, if provided
* 3. -DOSNAME="\"foo\"", if provided during compilation
* 4. "sysname release" from uname(3)
*/

free(mdoc->meta.os);
mdoc->meta.os = NULL;
deroff(&mdoc->meta.os, n);
if (mdoc->meta.os)
goto out;

if (mdoc->os_s != NULL) {
mdoc->meta.os = mandoc_strdup(mdoc->os_s);
goto out;
}

#ifdef OSNAME
mdoc->meta.os = mandoc_strdup(OSNAME);
#else /*!OSNAME */
if (defbuf == NULL) {
if (uname(&utsname) == -1) {
mandoc_msg(MANDOCERR_OS_UNAME, n->line, n->pos, "Os");
defbuf = mandoc_strdup("UNKNOWN");
} else
mandoc_asprintf(&defbuf, "%s %s",
utsname.sysname, utsname.release);
}
mdoc->meta.os = mandoc_strdup(defbuf);
#endif /*!OSNAME*/

out:
if (mdoc->meta.os_e == MANDOC_OS_OTHER) {
if (strstr(mdoc->meta.os, "OpenBSD") != NULL)
mdoc->meta.os_e = MANDOC_OS_OPENBSD;
else if (strstr(mdoc->meta.os, "NetBSD") != NULL)
mdoc->meta.os_e = MANDOC_OS_NETBSD;
}

/*
* This is the earliest point where we can check
* Mdocdate conventions because we don't know
* the operating system earlier.
*/

if (n->child != NULL)
mandoc_msg(MANDOCERR_OS_ARG, n->child->line, n->child->pos,
"Os %s (%s)", n->child->string,
mdoc->meta.os_e == MANDOC_OS_OPENBSD ?
"OpenBSD" : "NetBSD");

while (n->tok != MDOC_Dd)
if ((n = n->prev) == NULL)
return;
if ((n = n->child) == NULL)
return;
if (strncmp(n->string, "$" "Mdocdate", 9)) {
if (mdoc->meta.os_e == MANDOC_OS_OPENBSD)
mandoc_msg(MANDOCERR_MDOCDATE_MISSING, n->line,
n->pos, "Dd %s (OpenBSD)", n->string);
} else {
if (mdoc->meta.os_e == MANDOC_OS_NETBSD)
mandoc_msg(MANDOCERR_MDOCDATE, n->line,
n->pos, "Dd %s (NetBSD)", n->string);
}
}

enum roff_sec
mdoc_a2sec(const char *p)
{
int i;

for (i = 0; i < (int)SEC__MAX; i++)
if (secnames[i] && 0 == strcmp(p, secnames[i]))
return (enum roff_sec)i;

return SEC_CUSTOM;
}

static size_t
macro2len(enum roff_tok 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;
}