mdoc_validate.c

   1 /*      $Id: mdoc_validate.c,v 1.101 2010/06/27 17:53:27 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #include <sys/types.h>
  22
  23 #include <assert.h>
  24 #include <ctype.h>
  25 #include <limits.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "mandoc.h"
  31 #include "libmdoc.h"
  32 #include "libmandoc.h"
  33
  34 /* FIXME: .Bl -diag can't have non-text children in HEAD. */
  35 /* TODO: ignoring Pp (it's superfluous in some invocations). */
  36
  37 #define PRE_ARGS  struct mdoc *mdoc, struct mdoc_node *n
  38 #define POST_ARGS struct mdoc *mdoc
  39
  40 typedef int     (*v_pre)(PRE_ARGS);
  41 typedef int     (*v_post)(POST_ARGS);
  42
  43 struct  valids {
  44         v_pre   *pre;
  45         v_post  *post;
  46 };
  47
  48 static  int      check_parent(PRE_ARGS, enum mdoct, enum mdoc_type);
  49 static  int      check_stdarg(PRE_ARGS);
  50 static  int      check_text(struct mdoc *, int, int, char *);
  51 static  int      check_argv(struct mdoc *,
  52                         struct mdoc_node *, struct mdoc_argv *);
  53 static  int      check_args(struct mdoc *, struct mdoc_node *);
  54 static  int      err_child_lt(struct mdoc *, const char *, int);
  55 static  int      warn_child_lt(struct mdoc *, const char *, int);
  56 static  int      err_child_gt(struct mdoc *, const char *, int);
  57 static  int      warn_child_gt(struct mdoc *, const char *, int);
  58 static  int      err_child_eq(struct mdoc *, const char *, int);
  59 static  int      warn_child_eq(struct mdoc *, const char *, int);
  60 static  int      warn_count(struct mdoc *, const char *,
  61                         int, const char *, int);
  62 static  int      err_count(struct mdoc *, const char *,
  63                         int, const char *, int);
  64
  65 static  int      berr_ge1(POST_ARGS);
  66 static  int      bwarn_ge1(POST_ARGS);
  67 static  int      ebool(POST_ARGS);
  68 static  int      eerr_eq0(POST_ARGS);
  69 static  int      eerr_eq1(POST_ARGS);
  70 static  int      eerr_ge1(POST_ARGS);
  71 static  int      eerr_le1(POST_ARGS);
  72 static  int      ewarn_ge1(POST_ARGS);
  73 static  int      herr_eq0(POST_ARGS);
  74 static  int      herr_ge1(POST_ARGS);
  75 static  int      hwarn_eq1(POST_ARGS);
  76 static  int      hwarn_eq0(POST_ARGS);
  77 static  int      hwarn_le1(POST_ARGS);
  78
  79 static  int      post_an(POST_ARGS);
  80 static  int      post_at(POST_ARGS);
  81 static  int      post_bf(POST_ARGS);
  82 static  int      post_bl(POST_ARGS);
  83 static  int      post_bl_head(POST_ARGS);
  84 static  int      post_dt(POST_ARGS);
  85 static  int      post_it(POST_ARGS);
  86 static  int      post_lb(POST_ARGS);
  87 static  int      post_nm(POST_ARGS);
  88 static  int      post_root(POST_ARGS);
  89 static  int      post_rs(POST_ARGS);
  90 static  int      post_sh(POST_ARGS);
  91 static  int      post_sh_body(POST_ARGS);
  92 static  int      post_sh_head(POST_ARGS);
  93 static  int      post_st(POST_ARGS);
  94 static  int      post_eoln(POST_ARGS);
  95 static  int      post_vt(POST_ARGS);
  96 static  int      pre_an(PRE_ARGS);
  97 static  int      pre_bd(PRE_ARGS);
  98 static  int      pre_bl(PRE_ARGS);
  99 static  int      pre_dd(PRE_ARGS);
 100 static  int      pre_display(PRE_ARGS);
 101 static  int      pre_dt(PRE_ARGS);
 102 static  int      pre_it(PRE_ARGS);
 103 static  int      pre_os(PRE_ARGS);
 104 static  int      pre_rv(PRE_ARGS);
 105 static  int      pre_sh(PRE_ARGS);
 106 static  int      pre_ss(PRE_ARGS);
 107
 108 static  v_post   posts_an[] = { post_an, NULL };
 109 static  v_post   posts_at[] = { post_at, NULL };
 110 static  v_post   posts_bd_bk[] = { hwarn_eq0, bwarn_ge1, NULL };
 111 static  v_post   posts_bf[] = { hwarn_le1, post_bf, NULL };
 112 static  v_post   posts_bl[] = { bwarn_ge1, post_bl, NULL };
 113 static  v_post   posts_bool[] = { eerr_eq1, ebool, NULL };
 114 static  v_post   posts_eoln[] = { post_eoln, NULL };
 115 static  v_post   posts_dt[] = { post_dt, NULL };
 116 static  v_post   posts_fo[] = { hwarn_eq1, bwarn_ge1, NULL };
 117 static  v_post   posts_it[] = { post_it, NULL };
 118 static  v_post   posts_lb[] = { eerr_eq1, post_lb, NULL };
 119 static  v_post   posts_nd[] = { berr_ge1, NULL };
 120 static  v_post   posts_nm[] = { post_nm, NULL };
 121 static  v_post   posts_notext[] = { eerr_eq0, NULL };
 122 static  v_post   posts_rs[] = { berr_ge1, herr_eq0, post_rs, NULL };
 123 static  v_post   posts_sh[] = { herr_ge1, bwarn_ge1, post_sh, NULL };
 124 static  v_post   posts_sp[] = { eerr_le1, NULL };
 125 static  v_post   posts_ss[] = { herr_ge1, NULL };
 126 static  v_post   posts_st[] = { eerr_eq1, post_st, NULL };
 127 static  v_post   posts_text[] = { eerr_ge1, NULL };
 128 static  v_post   posts_text1[] = { eerr_eq1, NULL };
 129 static  v_post   posts_vt[] = { post_vt, NULL };
 130 static  v_post   posts_wline[] = { bwarn_ge1, herr_eq0, NULL };
 131 static  v_post   posts_wtext[] = { ewarn_ge1, NULL };
 132 static  v_pre    pres_an[] = { pre_an, NULL };
 133 static  v_pre    pres_bd[] = { pre_display, pre_bd, NULL };
 134 static  v_pre    pres_bl[] = { pre_bl, NULL };
 135 static  v_pre    pres_d1[] = { pre_display, NULL };
 136 static  v_pre    pres_dd[] = { pre_dd, NULL };
 137 static  v_pre    pres_dt[] = { pre_dt, NULL };
 138 static  v_pre    pres_er[] = { NULL, NULL };
 139 static  v_pre    pres_ex[] = { NULL, NULL };
 140 static  v_pre    pres_fd[] = { NULL, NULL };
 141 static  v_pre    pres_it[] = { pre_it, NULL };
 142 static  v_pre    pres_os[] = { pre_os, NULL };
 143 static  v_pre    pres_rv[] = { pre_rv, NULL };
 144 static  v_pre    pres_sh[] = { pre_sh, NULL };
 145 static  v_pre    pres_ss[] = { pre_ss, NULL };
 146
 147 const   struct valids mdoc_valids[MDOC_MAX] = {
 148         { NULL, NULL },                         /* Ap */
 149         { pres_dd, posts_text },                /* Dd */
 150         { pres_dt, posts_dt },                  /* Dt */
 151         { pres_os, NULL },                      /* Os */
 152         { pres_sh, posts_sh },                  /* Sh */
 153         { pres_ss, posts_ss },                  /* Ss */
 154         { NULL, posts_notext },                 /* Pp */
 155         { pres_d1, posts_wline },               /* D1 */
 156         { pres_d1, posts_wline },               /* Dl */
 157         { pres_bd, posts_bd_bk },                       /* Bd */
 158         { NULL, NULL },                         /* Ed */
 159         { pres_bl, posts_bl },                  /* Bl */
 160         { NULL, NULL },                         /* El */
 161         { pres_it, posts_it },                  /* It */
 162         { NULL, posts_text },                   /* Ad */
 163         { pres_an, posts_an },                  /* An */
 164         { NULL, NULL },                         /* Ar */
 165         { NULL, posts_text },                   /* Cd */
 166         { NULL, NULL },                         /* Cm */
 167         { NULL, NULL },                         /* Dv */
 168         { pres_er, posts_text },                /* Er */
 169         { NULL, NULL },                         /* Ev */
 170         { pres_ex, NULL },                      /* Ex */
 171         { NULL, NULL },                         /* Fa */
 172         { pres_fd, posts_wtext },               /* Fd */
 173         { NULL, NULL },                         /* Fl */
 174         { NULL, posts_text },                   /* Fn */
 175         { NULL, posts_wtext },                  /* Ft */
 176         { NULL, posts_text },                   /* Ic */
 177         { NULL, posts_text1 },                  /* In */
 178         { NULL, NULL },                         /* Li */
 179         { NULL, posts_nd },                     /* Nd */
 180         { NULL, posts_nm },                     /* Nm */
 181         { NULL, posts_wline },                  /* Op */
 182         { NULL, NULL },                         /* Ot */
 183         { NULL, NULL },                         /* Pa */
 184         { pres_rv, NULL },                      /* Rv */
 185         { NULL, posts_st },                     /* St */
 186         { NULL, NULL },                         /* Va */
 187         { NULL, posts_vt },                     /* Vt */
 188         { NULL, posts_wtext },                  /* Xr */
 189         { NULL, posts_text },                   /* %A */
 190         { NULL, posts_text },                   /* %B */ /* FIXME: can be used outside Rs/Re. */
 191         { NULL, posts_text },                   /* %D */ /* FIXME: check date with mandoc_a2time(). */
 192         { NULL, posts_text },                   /* %I */
 193         { NULL, posts_text },                   /* %J */
 194         { NULL, posts_text },                   /* %N */
 195         { NULL, posts_text },                   /* %O */
 196         { NULL, posts_text },                   /* %P */
 197         { NULL, posts_text },                   /* %R */
 198         { NULL, posts_text },                   /* %T */ /* FIXME: can be used outside Rs/Re. */
 199         { NULL, posts_text },                   /* %V */
 200         { NULL, NULL },                         /* Ac */
 201         { NULL, NULL },                         /* Ao */
 202         { NULL, posts_wline },                  /* Aq */
 203         { NULL, posts_at },                     /* At */
 204         { NULL, NULL },                         /* Bc */
 205         { NULL, posts_bf },                     /* Bf */
 206         { NULL, NULL },                         /* Bo */
 207         { NULL, posts_wline },                  /* Bq */
 208         { NULL, NULL },                         /* Bsx */
 209         { NULL, NULL },                         /* Bx */
 210         { NULL, posts_bool },                   /* Db */
 211         { NULL, NULL },                         /* Dc */
 212         { NULL, NULL },                         /* Do */
 213         { NULL, posts_wline },                  /* Dq */
 214         { NULL, NULL },                         /* Ec */
 215         { NULL, NULL },                         /* Ef */
 216         { NULL, NULL },                         /* Em */
 217         { NULL, NULL },                         /* Eo */
 218         { NULL, NULL },                         /* Fx */
 219         { NULL, posts_text },                   /* Ms */
 220         { NULL, posts_notext },                 /* No */
 221         { NULL, posts_notext },                 /* Ns */
 222         { NULL, NULL },                         /* Nx */
 223         { NULL, NULL },                         /* Ox */
 224         { NULL, NULL },                         /* Pc */
 225         { NULL, posts_text1 },                  /* Pf */
 226         { NULL, NULL },                         /* Po */
 227         { NULL, posts_wline },                  /* Pq */
 228         { NULL, NULL },                         /* Qc */
 229         { NULL, posts_wline },                  /* Ql */
 230         { NULL, NULL },                         /* Qo */
 231         { NULL, posts_wline },                  /* Qq */
 232         { NULL, NULL },                         /* Re */
 233         { NULL, posts_rs },                     /* Rs */
 234         { NULL, NULL },                         /* Sc */
 235         { NULL, NULL },                         /* So */
 236         { NULL, posts_wline },                  /* Sq */
 237         { NULL, posts_bool },                   /* Sm */
 238         { NULL, posts_text },                   /* Sx */
 239         { NULL, posts_text },                   /* Sy */
 240         { NULL, posts_text },                   /* Tn */
 241         { NULL, NULL },                         /* Ux */
 242         { NULL, NULL },                         /* Xc */
 243         { NULL, NULL },                         /* Xo */
 244         { NULL, posts_fo },                     /* Fo */
 245         { NULL, NULL },                         /* Fc */
 246         { NULL, NULL },                         /* Oo */
 247         { NULL, NULL },                         /* Oc */
 248         { NULL, posts_bd_bk },                  /* Bk */
 249         { NULL, NULL },                         /* Ek */
 250         { NULL, posts_eoln },                   /* Bt */
 251         { NULL, NULL },                         /* Hf */
 252         { NULL, NULL },                         /* Fr */
 253         { NULL, posts_eoln },                   /* Ud */
 254         { NULL, posts_lb },                     /* Lb */
 255         { NULL, posts_notext },                 /* Lp */
 256         { NULL, posts_text },                   /* Lk */
 257         { NULL, posts_text },                   /* Mt */
 258         { NULL, posts_wline },                  /* Brq */
 259         { NULL, NULL },                         /* Bro */
 260         { NULL, NULL },                         /* Brc */
 261         { NULL, posts_text },                   /* %C */
 262         { NULL, NULL },                         /* Es */
 263         { NULL, NULL },                         /* En */
 264         { NULL, NULL },                         /* Dx */
 265         { NULL, posts_text },                   /* %Q */
 266         { NULL, posts_notext },                 /* br */
 267         { NULL, posts_sp },                     /* sp */
 268         { NULL, posts_text1 },                  /* %U */
 269         { NULL, NULL },                         /* Ta */
 270 };
 271
 272
 273 int
 274 mdoc_valid_pre(struct mdoc *mdoc, struct mdoc_node *n)
 275 {
 276         v_pre           *p;
 277         int              line, pos;
 278         char            *tp;
 279
 280         if (MDOC_TEXT == n->type) {
 281                 tp = n->string;
 282                 line = n->line;
 283                 pos = n->pos;
 284                 return(check_text(mdoc, line, pos, tp));
 285         }
 286
 287         if ( ! check_args(mdoc, n))
 288                 return(0);
 289         if (NULL == mdoc_valids[n->tok].pre)
 290                 return(1);
 291         for (p = mdoc_valids[n->tok].pre; *p; p++)
 292                 if ( ! (*p)(mdoc, n))
 293                         return(0);
 294         return(1);
 295 }
 296
 297
 298 int
 299 mdoc_valid_post(struct mdoc *mdoc)
 300 {
 301         v_post          *p;
 302
 303         if (MDOC_VALID & mdoc->last->flags)
 304                 return(1);
 305         mdoc->last->flags |= MDOC_VALID;
 306
 307         if (MDOC_TEXT == mdoc->last->type)
 308                 return(1);
 309         if (MDOC_ROOT == mdoc->last->type)
 310                 return(post_root(mdoc));
 311
 312         if (NULL == mdoc_valids[mdoc->last->tok].post)
 313                 return(1);
 314         for (p = mdoc_valids[mdoc->last->tok].post; *p; p++)
 315                 if ( ! (*p)(mdoc))
 316                         return(0);
 317
 318         return(1);
 319 }
 320
 321
 322 static inline int
 323 warn_count(struct mdoc *m, const char *k,
 324                 int want, const char *v, int has)
 325 {
 326
 327         return(mdoc_vmsg(m, MANDOCERR_ARGCOUNT,
 328                                 m->last->line, m->last->pos,
 329                                 "%s %s %d (have %d)", v, k, want, has));
 330 }
 331
 332
 333 static inline int
 334 err_count(struct mdoc *m, const char *k,
 335                 int want, const char *v, int has)
 336 {
 337
 338         mdoc_vmsg(m, MANDOCERR_SYNTARGCOUNT,
 339                         m->last->line, m->last->pos,
 340                         "%s %s %d (have %d)",
 341                         v, k, want, has);
 342         return(0);
 343 }
 344
 345
 346 /*
 347  * Build these up with macros because they're basically the same check
 348  * for different inequalities.  Yes, this could be done with functions,
 349  * but this is reasonable for now.
 350  */
 351
 352 #define CHECK_CHILD_DEFN(lvl, name, ineq)                       \
 353 static int                                                      \
 354 lvl##_child_##name(struct mdoc *mdoc, const char *p, int sz)    \
 355 {                                                               \
 356         if (mdoc->last->nchild ineq sz)                         \
 357                 return(1);                                      \
 358         return(lvl##_count(mdoc, #ineq, sz, p, mdoc->last->nchild)); \
 359 }
 360
 361 #define CHECK_BODY_DEFN(name, lvl, func, num)                   \
 362 static int                                                      \
 363 b##lvl##_##name(POST_ARGS)                                      \
 364 {                                                               \
 365         if (MDOC_BODY != mdoc->last->type)                      \
 366                 return(1);                                      \
 367         return(func(mdoc, "multi-line arguments", (num)));      \
 368 }
 369
 370 #define CHECK_ELEM_DEFN(name, lvl, func, num)                   \
 371 static int                                                      \
 372 e##lvl##_##name(POST_ARGS)                                      \
 373 {                                                               \
 374         assert(MDOC_ELEM == mdoc->last->type);                  \
 375         return(func(mdoc, "line arguments", (num)));            \
 376 }
 377
 378 #define CHECK_HEAD_DEFN(name, lvl, func, num)                   \
 379 static int                                                      \
 380 h##lvl##_##name(POST_ARGS)                                      \
 381 {                                                               \
 382         if (MDOC_HEAD != mdoc->last->type)                      \
 383                 return(1);                                      \
 384         return(func(mdoc, "line arguments", (num)));            \
 385 }
 386
 387
 388 CHECK_CHILD_DEFN(warn, gt, >)                   /* warn_child_gt() */
 389 CHECK_CHILD_DEFN(err, gt, >)                    /* err_child_gt() */
 390 CHECK_CHILD_DEFN(warn, eq, ==)                  /* warn_child_eq() */
 391 CHECK_CHILD_DEFN(err, eq, ==)                   /* err_child_eq() */
 392 CHECK_CHILD_DEFN(err, lt, <)                    /* err_child_lt() */
 393 CHECK_CHILD_DEFN(warn, lt, <)                   /* warn_child_lt() */
 394 CHECK_BODY_DEFN(ge1, warn, warn_child_gt, 0)    /* bwarn_ge1() */
 395 CHECK_BODY_DEFN(ge1, err, err_child_gt, 0)      /* berr_ge1() */
 396 CHECK_ELEM_DEFN(ge1, warn, warn_child_gt, 0)    /* ewarn_ge1() */
 397 CHECK_ELEM_DEFN(eq1, err, err_child_eq, 1)      /* eerr_eq1() */
 398 CHECK_ELEM_DEFN(le1, err, err_child_lt, 2)      /* eerr_le1() */
 399 CHECK_ELEM_DEFN(eq0, err, err_child_eq, 0)      /* eerr_eq0() */
 400 CHECK_ELEM_DEFN(ge1, err, err_child_gt, 0)      /* eerr_ge1() */
 401 CHECK_HEAD_DEFN(eq0, err, err_child_eq, 0)      /* herr_eq0() */
 402 CHECK_HEAD_DEFN(le1, warn, warn_child_lt, 2)    /* hwarn_le1() */
 403 CHECK_HEAD_DEFN(ge1, err, err_child_gt, 0)      /* herr_ge1() */
 404 CHECK_HEAD_DEFN(eq1, warn, warn_child_eq, 1)    /* hwarn_eq1() */
 405 CHECK_HEAD_DEFN(eq0, warn, warn_child_eq, 0)    /* hwarn_eq0() */
 406
 407
 408 static int
 409 check_stdarg(PRE_ARGS)
 410 {
 411
 412         if (n->args && 1 == n->args->argc)
 413                 if (MDOC_Std == n->args->argv[0].arg)
 414                         return(1);
 415         return(mdoc_nmsg(mdoc, n, MANDOCERR_NOARGV));
 416 }
 417
 418
 419 static int
 420 check_args(struct mdoc *m, struct mdoc_node *n)
 421 {
 422         int              i;
 423
 424         if (NULL == n->args)
 425                 return(1);
 426
 427         assert(n->args->argc);
 428         for (i = 0; i < (int)n->args->argc; i++)
 429                 if ( ! check_argv(m, n, &n->args->argv[i]))
 430                         return(0);
 431
 432         return(1);
 433 }
 434
 435
 436 static int
 437 check_argv(struct mdoc *m, struct mdoc_node *n, struct mdoc_argv *v)
 438 {
 439         int              i;
 440
 441         for (i = 0; i < (int)v->sz; i++)
 442                 if ( ! check_text(m, v->line, v->pos, v->value[i]))
 443                         return(0);
 444
 445         if (MDOC_Std == v->arg) {
 446                 if (v->sz || m->meta.name)
 447                         return(1);
 448                 if ( ! mdoc_nmsg(m, n, MANDOCERR_NONAME))
 449                         return(0);
 450         }
 451
 452         return(1);
 453 }
 454
 455
 456 static int
 457 check_text(struct mdoc *mdoc, int line, int pos, char *p)
 458 {
 459         int              c;
 460
 461         for ( ; *p; p++, pos++) {
 462                 if ('\t' == *p) {
 463                         if ( ! (MDOC_LITERAL & mdoc->flags))
 464                                 if ( ! mdoc_pmsg(mdoc, line, pos, MANDOCERR_BADCHAR))
 465                                         return(0);
 466                 } else if ( ! isprint((u_char)*p) && ASCII_HYPH != *p)
 467                         if ( ! mdoc_pmsg(mdoc, line, pos, MANDOCERR_BADCHAR))
 468                                 return(0);
 469
 470                 if ('\\' != *p)
 471                         continue;
 472
 473                 c = mandoc_special(p);
 474                 if (c) {
 475                         p += c - 1;
 476                         pos += c - 1;
 477                         continue;
 478                 }
 479
 480                 c = mdoc_pmsg(mdoc, line, pos, MANDOCERR_BADESCAPE);
 481                 if ( ! (MDOC_IGN_ESCAPE & mdoc->pflags) && ! c)
 482                         return(c);
 483         }
 484
 485         return(1);
 486 }
 487
 488
 489
 490
 491 static int
 492 check_parent(PRE_ARGS, enum mdoct tok, enum mdoc_type t)
 493 {
 494
 495         assert(n->parent);
 496         if ((MDOC_ROOT == t || tok == n->parent->tok) &&
 497                         (t == n->parent->type))
 498                 return(1);
 499
 500         mdoc_vmsg(mdoc, MANDOCERR_SYNTCHILD,
 501                                 n->line, n->pos, "want parent %s",
 502                                 MDOC_ROOT == t ? "<root>" :
 503                                         mdoc_macronames[tok]);
 504         return(0);
 505 }
 506
 507
 508
 509 static int
 510 pre_display(PRE_ARGS)
 511 {
 512         struct mdoc_node *node;
 513
 514         /* Display elements (`Bd', `D1'...) cannot be nested. */
 515
 516         if (MDOC_BLOCK != n->type)
 517                 return(1);
 518
 519         /* LINTED */
 520         for (node = mdoc->last->parent; node; node = node->parent)
 521                 if (MDOC_BLOCK == node->type)
 522                         if (MDOC_Bd == node->tok)
 523                                 break;
 524         if (NULL == node)
 525                 return(1);
 526
 527         mdoc_nmsg(mdoc, n, MANDOCERR_NESTEDDISP);
 528         return(0);
 529 }
 530
 531
 532 static int
 533 pre_bl(PRE_ARGS)
 534 {
 535         int              i, comp, dup;
 536         const char      *offs, *width;
 537         enum mdoc_list   lt;
 538
 539         if (MDOC_BLOCK != n->type) {
 540                 assert(n->parent);
 541                 assert(MDOC_BLOCK == n->parent->type);
 542                 assert(MDOC_Bl == n->parent->tok);
 543                 assert(LIST__NONE != n->parent->data.Bl.type);
 544                 memcpy(&n->data.Bl, &n->parent->data.Bl,
 545                                 sizeof(struct mdoc_bl));
 546                 return(1);
 547         }
 548
 549         /*
 550          * First figure out which kind of list to use: bind ourselves to
 551          * the first mentioned list type and warn about any remaining
 552          * ones.  If we find no list type, we default to LIST_item.
 553          */
 554
 555         assert(LIST__NONE == n->data.Bl.type);
 556
 557         /* LINTED */
 558         for (i = 0; n->args && i < (int)n->args->argc; i++) {
 559                 lt = LIST__NONE;
 560                 dup = comp = 0;
 561                 width = offs = NULL;
 562                 switch (n->args->argv[i].arg) {
 563                 /* Set list types. */
 564                 case (MDOC_Bullet):
 565                         lt = LIST_bullet;
 566                         break;
 567                 case (MDOC_Dash):
 568                         lt = LIST_dash;
 569                         break;
 570                 case (MDOC_Enum):
 571                         lt = LIST_enum;
 572                         break;
 573                 case (MDOC_Hyphen):
 574                         lt = LIST_hyphen;
 575                         break;
 576                 case (MDOC_Item):
 577                         lt = LIST_item;
 578                         break;
 579                 case (MDOC_Tag):
 580                         lt = LIST_tag;
 581                         break;
 582                 case (MDOC_Diag):
 583                         lt = LIST_diag;
 584                         break;
 585                 case (MDOC_Hang):
 586                         lt = LIST_hang;
 587                         break;
 588                 case (MDOC_Ohang):
 589                         lt = LIST_ohang;
 590                         break;
 591                 case (MDOC_Inset):
 592                         lt = LIST_inset;
 593                         break;
 594                 case (MDOC_Column):
 595                         lt = LIST_column;
 596                         break;
 597                 /* Set list arguments. */
 598                 case (MDOC_Compact):
 599                         dup = n->data.Bl.comp;
 600                         comp = 1;
 601                         break;
 602                 case (MDOC_Width):
 603                         dup = (NULL != n->data.Bl.width);
 604                         width = n->args->argv[i].value[0];
 605                         break;
 606                 case (MDOC_Offset):
 607                         /* NB: this can be empty! */
 608                         if (n->args->argv[i].sz) {
 609                                 offs = n->args->argv[i].value[0];
 610                                 dup = (NULL != n->data.Bl.offs);
 611                                 break;
 612                         }
 613                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_IGNARGV))
 614                                 return(0);
 615                         break;
 616                 }
 617
 618                 /* Check: duplicate auxiliary arguments. */
 619
 620                 if (dup && ! mdoc_nmsg(mdoc, n, MANDOCERR_ARGVREP))
 621                         return(0);
 622
 623                 if (comp && ! dup)
 624                         n->data.Bl.comp = comp;
 625                 if (offs && ! dup)
 626                         n->data.Bl.offs = offs;
 627                 if (width && ! dup)
 628                         n->data.Bl.width = width;
 629
 630                 /* Check: multiple list types. */
 631
 632                 if (LIST__NONE != lt && n->data.Bl.type != LIST__NONE)
 633                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_LISTREP))
 634                                 return(0);
 635
 636                 /* Assign list type. */
 637
 638                 if (LIST__NONE != lt && n->data.Bl.type == LIST__NONE)
 639                         n->data.Bl.type = lt;
 640
 641                 /* The list type should come first. */
 642
 643                 if (n->data.Bl.type == LIST__NONE)
 644                         if (n->data.Bl.width ||
 645                                         n->data.Bl.offs ||
 646                                         n->data.Bl.comp)
 647                                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_LISTFIRST))
 648                                         return(0);
 649
 650                 continue;
 651         }
 652
 653         /* Allow lists to default to LIST_item. */
 654
 655         if (LIST__NONE == n->data.Bl.type) {
 656                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_LISTTYPE))
 657                         return(0);
 658                 n->data.Bl.type = LIST_item;
 659         }
 660
 661         /*
 662          * Validate the width field.  Some list types don't need width
 663          * types and should be warned about them.  Others should have it
 664          * and must also be warned.
 665          */
 666
 667         switch (n->data.Bl.type) {
 668         case (LIST_tag):
 669                 if (n->data.Bl.width)
 670                         break;
 671                 if (mdoc_nmsg(mdoc, n, MANDOCERR_NOWIDTHARG))
 672                         break;
 673                 return(0);
 674         case (LIST_column):
 675                 /* FALLTHROUGH */
 676         case (LIST_diag):
 677                 /* FALLTHROUGH */
 678         case (LIST_ohang):
 679                 /* FALLTHROUGH */
 680         case (LIST_inset):
 681                 /* FALLTHROUGH */
 682         case (LIST_item):
 683                 if (NULL == n->data.Bl.width)
 684                         break;
 685                 if (mdoc_nmsg(mdoc, n, MANDOCERR_WIDTHARG))
 686                         break;
 687                 return(0);
 688         default:
 689                 break;
 690         }
 691
 692         return(1);
 693 }
 694
 695
 696 static int
 697 pre_bd(PRE_ARGS)
 698 {
 699         int              i, dup, comp;
 700         enum mdoc_disp   dt;
 701         const char      *offs;
 702
 703         if (MDOC_BLOCK != n->type) {
 704                 assert(n->parent);
 705                 assert(MDOC_BLOCK == n->parent->type);
 706                 assert(MDOC_Bd == n->parent->tok);
 707                 assert(DISP__NONE != n->parent->data.Bd.type);
 708                 memcpy(&n->data.Bd, &n->parent->data.Bd,
 709                                 sizeof(struct mdoc_bd));
 710                 return(1);
 711         }
 712
 713         assert(DISP__NONE == n->data.Bd.type);
 714
 715         /* LINTED */
 716         for (i = 0; n->args && i < (int)n->args->argc; i++) {
 717                 dt = DISP__NONE;
 718                 dup = comp = 0;
 719                 offs = NULL;
 720
 721                 switch (n->args->argv[i].arg) {
 722                 case (MDOC_Centred):
 723                         dt = DISP_centred;
 724                         break;
 725                 case (MDOC_Ragged):
 726                         dt = DISP_ragged;
 727                         break;
 728                 case (MDOC_Unfilled):
 729                         dt = DISP_unfilled;
 730                         break;
 731                 case (MDOC_Filled):
 732                         dt = DISP_filled;
 733                         break;
 734                 case (MDOC_Literal):
 735                         dt = DISP_literal;
 736                         break;
 737                 case (MDOC_File):
 738                         mdoc_nmsg(mdoc, n, MANDOCERR_BADDISP);
 739                         return(0);
 740                 case (MDOC_Offset):
 741                         /* NB: this can be empty! */
 742                         if (n->args->argv[i].sz) {
 743                                 offs = n->args->argv[i].value[0];
 744                                 dup = (NULL != n->data.Bd.offs);
 745                                 break;
 746                         }
 747                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_IGNARGV))
 748                                 return(0);
 749                         break;
 750                 case (MDOC_Compact):
 751                         comp = 1;
 752                         dup = n->data.Bd.comp;
 753                         break;
 754                 default:
 755                         abort();
 756                         /* NOTREACHED */
 757                 }
 758
 759                 /* Check whether we have duplicates. */
 760
 761                 if (dup && ! mdoc_nmsg(mdoc, n, MANDOCERR_ARGVREP))
 762                         return(0);
 763
 764                 /* Make our auxiliary assignments. */
 765
 766                 if (offs && ! dup)
 767                         n->data.Bd.offs = offs;
 768                 if (comp && ! dup)
 769                         n->data.Bd.comp = comp;
 770
 771                 /* Check whether a type has already been assigned. */
 772
 773                 if (DISP__NONE != dt && n->data.Bd.type != DISP__NONE)
 774                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_DISPREP))
 775                                 return(0);
 776
 777                 /* Make our type assignment. */
 778
 779                 if (DISP__NONE != dt && n->data.Bd.type == DISP__NONE)
 780                         n->data.Bd.type = dt;
 781         }
 782
 783         if (DISP__NONE == n->data.Bd.type) {
 784                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_DISPTYPE))
 785                         return(0);
 786                 n->data.Bd.type = DISP_ragged;
 787         }
 788
 789         return(1);
 790 }
 791
 792
 793 static int
 794 pre_ss(PRE_ARGS)
 795 {
 796
 797         if (MDOC_BLOCK != n->type)
 798                 return(1);
 799         return(check_parent(mdoc, n, MDOC_Sh, MDOC_BODY));
 800 }
 801
 802
 803 static int
 804 pre_sh(PRE_ARGS)
 805 {
 806
 807         if (MDOC_BLOCK != n->type)
 808                 return(1);
 809
 810         mdoc->regs->regs[(int)REG_nS].set = 0;
 811         return(check_parent(mdoc, n, MDOC_MAX, MDOC_ROOT));
 812 }
 813
 814
 815 static int
 816 pre_it(PRE_ARGS)
 817 {
 818
 819         if (MDOC_BLOCK != n->type)
 820                 return(1);
 821         /*
 822          * FIXME: this can probably be lifted if we make the It into
 823          * something else on-the-fly?
 824          */
 825         return(check_parent(mdoc, n, MDOC_Bl, MDOC_BODY));
 826 }
 827
 828
 829 static int
 830 pre_an(PRE_ARGS)
 831 {
 832
 833         if (NULL == n->args || 1 == n->args->argc)
 834                 return(1);
 835         mdoc_vmsg(mdoc, MANDOCERR_SYNTARGCOUNT,
 836                                 n->line, n->pos,
 837                                 "line arguments == 1 (have %d)",
 838                                 n->args->argc);
 839         return(0);
 840 }
 841
 842
 843 static int
 844 pre_rv(PRE_ARGS)
 845 {
 846
 847         return(check_stdarg(mdoc, n));
 848 }
 849
 850
 851 static int
 852 post_dt(POST_ARGS)
 853 {
 854         const struct mdoc_node *nn;
 855         const char      *p;
 856
 857         if (NULL != (nn = mdoc->last->child))
 858                 for (p = nn->string; *p; p++) {
 859                         if (toupper((u_char)*p) == *p)
 860                                 continue;
 861                         if ( ! mdoc_nmsg(mdoc, nn, MANDOCERR_UPPERCASE))
 862                                 return(0);
 863                         break;
 864                 }
 865
 866         return(1);
 867 }
 868
 869
 870 static int
 871 pre_dt(PRE_ARGS)
 872 {
 873
 874         if (0 == mdoc->meta.date || mdoc->meta.os)
 875                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO))
 876                         return(0);
 877         if (mdoc->meta.title)
 878                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP))
 879                         return(0);
 880         return(1);
 881 }
 882
 883
 884 static int
 885 pre_os(PRE_ARGS)
 886 {
 887
 888         if (NULL == mdoc->meta.title || 0 == mdoc->meta.date)
 889                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO))
 890                         return(0);
 891         if (mdoc->meta.os)
 892                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP))
 893                         return(0);
 894         return(1);
 895 }
 896
 897
 898 static int
 899 pre_dd(PRE_ARGS)
 900 {
 901
 902         if (mdoc->meta.title || mdoc->meta.os)
 903                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO))
 904                         return(0);
 905         if (mdoc->meta.date)
 906                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP))
 907                         return(0);
 908         return(1);
 909 }
 910
 911
 912 static int
 913 post_bf(POST_ARGS)
 914 {
 915         char             *p;
 916         struct mdoc_node *head;
 917
 918         if (MDOC_BLOCK != mdoc->last->type)
 919                 return(1);
 920
 921         head = mdoc->last->head;
 922
 923         if (mdoc->last->args && head->child) {
 924                 /* FIXME: this should provide a default. */
 925                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SYNTARGVCOUNT);
 926                 return(0);
 927         } else if (mdoc->last->args)
 928                 return(1);
 929
 930         if (NULL == head->child || MDOC_TEXT != head->child->type) {
 931                 /* FIXME: this should provide a default. */
 932                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SYNTARGVCOUNT);
 933                 return(0);
 934         }
 935
 936         p = head->child->string;
 937
 938         if (0 == strcmp(p, "Em"))
 939                 return(1);
 940         else if (0 == strcmp(p, "Li"))
 941                 return(1);
 942         else if (0 == strcmp(p, "Sy"))
 943                 return(1);
 944
 945         mdoc_nmsg(mdoc, head, MANDOCERR_FONTTYPE);
 946         return(0);
 947 }
 948
 949
 950 static int
 951 post_lb(POST_ARGS)
 952 {
 953
 954         if (mdoc_a2lib(mdoc->last->child->string))
 955                 return(1);
 956         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADLIB));
 957 }
 958
 959
 960 static int
 961 post_eoln(POST_ARGS)
 962 {
 963
 964         if (NULL == mdoc->last->child)
 965                 return(1);
 966         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGSLOST));
 967 }
 968
 969
 970 static int
 971 post_vt(POST_ARGS)
 972 {
 973         const struct mdoc_node *n;
 974
 975         /*
 976          * The Vt macro comes in both ELEM and BLOCK form, both of which
 977          * have different syntaxes (yet more context-sensitive
 978          * behaviour).  ELEM types must have a child; BLOCK types,
 979          * specifically the BODY, should only have TEXT children.
 980          */
 981
 982         if (MDOC_ELEM == mdoc->last->type)
 983                 return(eerr_ge1(mdoc));
 984         if (MDOC_BODY != mdoc->last->type)
 985                 return(1);
 986
 987         for (n = mdoc->last->child; n; n = n->next)
 988                 if (MDOC_TEXT != n->type)
 989                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_CHILD))
 990                                 return(0);
 991
 992         return(1);
 993 }
 994
 995
 996 static int
 997 post_nm(POST_ARGS)
 998 {
 999
1000         if (mdoc->last->child)
1001                 return(1);
1002         if (mdoc->meta.name)
1003                 return(1);
1004         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NONAME));
1005 }
1006
1007
1008 static int
1009 post_at(POST_ARGS)
1010 {
1011
1012         if (NULL == mdoc->last->child)
1013                 return(1);
1014         assert(MDOC_TEXT == mdoc->last->child->type);
1015         if (mdoc_a2att(mdoc->last->child->string))
1016                 return(1);
1017         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADATT));
1018 }
1019
1020
1021 static int
1022 post_an(POST_ARGS)
1023 {
1024
1025         if (mdoc->last->args) {
1026                 if (NULL == mdoc->last->child)
1027                         return(1);
1028                 return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGCOUNT));
1029         }
1030
1031         if (mdoc->last->child)
1032                 return(1);
1033         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS));
1034 }
1035
1036
1037 static int
1038 post_it(POST_ARGS)
1039 {
1040         int               i, cols, rc;
1041         enum mdoc_list    lt;
1042         struct mdoc_node *n, *c;
1043         enum mandocerr    er;
1044
1045         if (MDOC_BLOCK != mdoc->last->type)
1046                 return(1);
1047
1048         n = mdoc->last->parent->parent;
1049         lt = n->data.Bl.type;
1050
1051         if (LIST__NONE == lt) {
1052                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_LISTTYPE);
1053                 return(0);
1054         }
1055
1056         switch (lt) {
1057         case (LIST_tag):
1058                 if (mdoc->last->head->child)
1059                         break;
1060                 /* FIXME: give this a dummy value. */
1061                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS))
1062                         return(0);
1063                 break;
1064         case (LIST_hang):
1065                 /* FALLTHROUGH */
1066         case (LIST_ohang):
1067                 /* FALLTHROUGH */
1068         case (LIST_inset):
1069                 /* FALLTHROUGH */
1070         case (LIST_diag):
1071                 if (NULL == mdoc->last->head->child)
1072                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS))
1073                                 return(0);
1074                 if (NULL == mdoc->last->body->child)
1075                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY))
1076                                 return(0);
1077                 break;
1078         case (LIST_bullet):
1079                 /* FALLTHROUGH */
1080         case (LIST_dash):
1081                 /* FALLTHROUGH */
1082         case (LIST_enum):
1083                 /* FALLTHROUGH */
1084         case (LIST_hyphen):
1085                 /* FALLTHROUGH */
1086         case (LIST_item):
1087                 if (mdoc->last->head->child)
1088                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGSLOST))
1089                                 return(0);
1090                 if (NULL == mdoc->last->body->child)
1091                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY))
1092                                 return(0);
1093                 break;
1094         case (LIST_column):
1095                 cols = -1;
1096                 for (i = 0; i < (int)n->args->argc; i++)
1097                         if (MDOC_Column == n->args->argv[i].arg) {
1098                                 cols = (int)n->args->argv[i].sz;
1099                                 break;
1100                         }
1101
1102                 assert(-1 != cols);
1103                 assert(NULL == mdoc->last->head->child);
1104
1105                 if (NULL == mdoc->last->body->child)
1106                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY))
1107                                 return(0);
1108
1109                 for (i = 0, c = mdoc->last->child; c; c = c->next)
1110                         if (MDOC_BODY == c->type)
1111                                 i++;
1112
1113                 if (i < cols)
1114                         er = MANDOCERR_ARGCOUNT;
1115                 else if (i == cols || i == cols + 1)
1116                         break;
1117                 else
1118                         er = MANDOCERR_SYNTARGCOUNT;
1119
1120                 rc = mdoc_vmsg(mdoc, er,
1121                                 mdoc->last->line, mdoc->last->pos,
1122                                 "columns == %d (have %d)", cols, i);
1123                 return(rc);
1124         default:
1125                 break;
1126         }
1127
1128         return(1);
1129 }
1130
1131
1132 static int
1133 post_bl_head(POST_ARGS)
1134 {
1135         int               i;
1136         struct mdoc_node *n;
1137
1138         assert(mdoc->last->parent);
1139         n = mdoc->last->parent;
1140
1141         if (LIST_column == n->data.Bl.type) {
1142                 for (i = 0; i < (int)n->args->argc; i++)
1143                         if (MDOC_Column == n->args->argv[i].arg)
1144                                 break;
1145                 assert(i < (int)n->args->argc);
1146
1147                 if (n->args->argv[i].sz && mdoc->last->nchild) {
1148                         mdoc_nmsg(mdoc, n, MANDOCERR_COLUMNS);
1149                         return(0);
1150                 }
1151                 return(1);
1152         }
1153
1154         if (0 == (i = mdoc->last->nchild))
1155                 return(1);
1156         return(warn_count(mdoc, "==", 0, "line arguments", i));
1157 }
1158
1159
1160 static int
1161 post_bl(POST_ARGS)
1162 {
1163         struct mdoc_node        *n;
1164
1165         if (MDOC_HEAD == mdoc->last->type)
1166                 return(post_bl_head(mdoc));
1167         if (MDOC_BODY != mdoc->last->type)
1168                 return(1);
1169         if (NULL == mdoc->last->child)
1170                 return(1);
1171
1172         /*
1173          * We only allow certain children of `Bl'.  This is usually on
1174          * `It', but apparently `Sm' occurs here and there, so we let
1175          * that one through, too.
1176          */
1177
1178         /* LINTED */
1179         for (n = mdoc->last->child; n; n = n->next) {
1180                 if (MDOC_BLOCK == n->type && MDOC_It == n->tok)
1181                         continue;
1182                 if (MDOC_Sm == n->tok)
1183                         continue;
1184                 mdoc_nmsg(mdoc, n, MANDOCERR_SYNTCHILD);
1185                 return(0);
1186         }
1187
1188         return(1);
1189 }
1190
1191
1192 static int
1193 ebool(struct mdoc *mdoc)
1194 {
1195         struct mdoc_node *n;
1196
1197         /* LINTED */
1198         for (n = mdoc->last->child; n; n = n->next) {
1199                 if (MDOC_TEXT != n->type)
1200                         break;
1201                 if (0 == strcmp(n->string, "on"))
1202                         continue;
1203                 if (0 == strcmp(n->string, "off"))
1204                         continue;
1205                 break;
1206         }
1207
1208         if (NULL == n)
1209                 return(1);
1210         return(mdoc_nmsg(mdoc, n, MANDOCERR_BADBOOL));
1211 }
1212
1213
1214 static int
1215 post_root(POST_ARGS)
1216 {
1217
1218         if (NULL == mdoc->first->child)
1219                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCBODY);
1220         else if ( ! (MDOC_PBODY & mdoc->flags))
1221                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCPROLOG);
1222         else if (MDOC_BLOCK != mdoc->first->child->type)
1223                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCBODY);
1224         else if (MDOC_Sh != mdoc->first->child->tok)
1225                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCBODY);
1226         else
1227                 return(1);
1228
1229         return(0);
1230 }
1231
1232
1233 static int
1234 post_st(POST_ARGS)
1235 {
1236
1237         if (mdoc_a2st(mdoc->last->child->string))
1238                 return(1);
1239         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADSTANDARD));
1240 }
1241
1242
1243 static int
1244 post_rs(POST_ARGS)
1245 {
1246         struct mdoc_node        *nn;
1247
1248         if (MDOC_BODY != mdoc->last->type)
1249                 return(1);
1250
1251         for (nn = mdoc->last->child; nn; nn = nn->next)
1252                 switch (nn->tok) {
1253                 case(MDOC__U):
1254                         /* FALLTHROUGH */
1255                 case(MDOC__Q):
1256                         /* FALLTHROUGH */
1257                 case(MDOC__C):
1258                         /* FALLTHROUGH */
1259                 case(MDOC__A):
1260                         /* FALLTHROUGH */
1261                 case(MDOC__B):
1262                         /* FALLTHROUGH */
1263                 case(MDOC__D):
1264                         /* FALLTHROUGH */
1265                 case(MDOC__I):
1266                         /* FALLTHROUGH */
1267                 case(MDOC__J):
1268                         /* FALLTHROUGH */
1269                 case(MDOC__N):
1270                         /* FALLTHROUGH */
1271                 case(MDOC__O):
1272                         /* FALLTHROUGH */
1273                 case(MDOC__P):
1274                         /* FALLTHROUGH */
1275                 case(MDOC__R):
1276                         /* FALLTHROUGH */
1277                 case(MDOC__T):
1278                         /* FALLTHROUGH */
1279                 case(MDOC__V):
1280                         break;
1281                 default:
1282                         mdoc_nmsg(mdoc, nn, MANDOCERR_SYNTCHILD);
1283                         return(0);
1284                 }
1285
1286         return(1);
1287 }
1288
1289
1290 static int
1291 post_sh(POST_ARGS)
1292 {
1293
1294         if (MDOC_HEAD == mdoc->last->type)
1295                 return(post_sh_head(mdoc));
1296         if (MDOC_BODY == mdoc->last->type)
1297                 return(post_sh_body(mdoc));
1298
1299         return(1);
1300 }
1301
1302
1303 static int
1304 post_sh_body(POST_ARGS)
1305 {
1306         struct mdoc_node *n;
1307
1308         if (SEC_NAME != mdoc->lastsec)
1309                 return(1);
1310
1311         /*
1312          * Warn if the NAME section doesn't contain the `Nm' and `Nd'
1313          * macros (can have multiple `Nm' and one `Nd').  Note that the
1314          * children of the BODY declaration can also be "text".
1315          */
1316
1317         if (NULL == (n = mdoc->last->child))
1318                 return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC));
1319
1320         for ( ; n && n->next; n = n->next) {
1321                 if (MDOC_ELEM == n->type && MDOC_Nm == n->tok)
1322                         continue;
1323                 if (MDOC_TEXT == n->type)
1324                         continue;
1325                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC))
1326                         return(0);
1327         }
1328
1329         assert(n);
1330         if (MDOC_BLOCK == n->type && MDOC_Nd == n->tok)
1331                 return(1);
1332         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC));
1333 }
1334
1335
1336 static int
1337 post_sh_head(POST_ARGS)
1338 {
1339         char                    buf[BUFSIZ];
1340         enum mdoc_sec           sec;
1341         const struct mdoc_node *n;
1342
1343         /*
1344          * Process a new section.  Sections are either "named" or
1345          * "custom"; custom sections are user-defined, while named ones
1346          * usually follow a conventional order and may only appear in
1347          * certain manual sections.
1348          */
1349
1350         buf[0] = '\0';
1351
1352         /*
1353          * FIXME: yes, these can use a dynamic buffer, but I don't do so
1354          * in the interests of simplicity.
1355          */
1356
1357         for (n = mdoc->last->child; n; n = n->next) {
1358                 /* XXX - copied from compact(). */
1359                 assert(MDOC_TEXT == n->type);
1360
1361                 if (strlcat(buf, n->string, BUFSIZ) >= BUFSIZ) {
1362                         mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
1363                         return(0);
1364                 }
1365                 if (NULL == n->next)
1366                         continue;
1367                 if (strlcat(buf, " ", BUFSIZ) >= BUFSIZ) {
1368                         mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
1369                         return(0);
1370                 }
1371         }
1372
1373         sec = mdoc_str2sec(buf);
1374
1375         /*
1376          * Check: NAME should always be first, CUSTOM has no roles,
1377          * non-CUSTOM has a conventional order to be followed.
1378          */
1379
1380         if (SEC_NAME != sec && SEC_NONE == mdoc->lastnamed)
1381                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NAMESECFIRST))
1382                         return(0);
1383
1384         if (SEC_CUSTOM == sec)
1385                 return(1);
1386
1387         if (sec == mdoc->lastnamed)
1388                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECREP))
1389                         return(0);
1390
1391         if (sec < mdoc->lastnamed)
1392                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECOOO))
1393                         return(0);
1394
1395         /*
1396          * Check particular section/manual conventions.  LIBRARY can
1397          * only occur in manual section 2, 3, and 9.
1398          */
1399
1400         switch (sec) {
1401         case (SEC_LIBRARY):
1402                 assert(mdoc->meta.msec);
1403                 if (*mdoc->meta.msec == '2')
1404                         break;
1405                 if (*mdoc->meta.msec == '3')
1406                         break;
1407                 if (*mdoc->meta.msec == '9')
1408                         break;
1409                 return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECMSEC));
1410         default:
1411                 break;
1412         }
1413
1414         return(1);
1415 }