mdoc_validate.c

   1 /*      $Id: mdoc_validate.c,v 1.93 2010/06/12 10:09:19 kristaps 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[] = { 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 },                  /* 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_wline },                  /* 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, width, offs, cmpt, dupl;
 536         enum mdoc_list   lt;
 537
 538         if (MDOC_BLOCK != n->type) {
 539                 assert(n->parent);
 540                 assert(MDOC_BLOCK == n->parent->type);
 541                 assert(MDOC_Bl == n->parent->tok);
 542                 assert(LIST__NONE != n->parent->data.list);
 543                 n->data.list = n->parent->data.list;
 544                 return(1);
 545         }
 546
 547         /*
 548          * First figure out which kind of list to use: bind ourselves to
 549          * the first mentioned list type and warn about any remaining
 550          * ones.  If we find no list type, we default to LIST_item.
 551          */
 552
 553         assert(LIST__NONE == n->data.list);
 554         offs = width = cmpt = -1;
 555
 556         /* LINTED */
 557         for (i = 0; n->args && i < (int)n->args->argc; i++) {
 558                 lt = LIST__NONE;
 559                 dupl = 0;
 560                 switch (n->args->argv[i].arg) {
 561                 /* Set list types. */
 562                 case (MDOC_Bullet):
 563                         lt = LIST_bullet;
 564                         break;
 565                 case (MDOC_Dash):
 566                         lt = LIST_dash;
 567                         break;
 568                 case (MDOC_Enum):
 569                         lt = LIST_enum;
 570                         break;
 571                 case (MDOC_Hyphen):
 572                         lt = LIST_hyphen;
 573                         break;
 574                 case (MDOC_Item):
 575                         lt = LIST_item;
 576                         break;
 577                 case (MDOC_Tag):
 578                         lt = LIST_tag;
 579                         break;
 580                 case (MDOC_Diag):
 581                         lt = LIST_diag;
 582                         break;
 583                 case (MDOC_Hang):
 584                         lt = LIST_hang;
 585                         break;
 586                 case (MDOC_Ohang):
 587                         lt = LIST_ohang;
 588                         break;
 589                 case (MDOC_Inset):
 590                         lt = LIST_inset;
 591                         break;
 592                 case (MDOC_Column):
 593                         lt = LIST_column;
 594                         break;
 595                 /* Set list arguments. */
 596                 case (MDOC_Compact):
 597                         if (cmpt >= 0)
 598                                 dupl++;
 599                         cmpt = i;
 600                         break;
 601                 case (MDOC_Width):
 602                         if (width >= 0)
 603                                 dupl++;
 604                         width = i;
 605                         break;
 606                 case (MDOC_Offset):
 607                         if (offs >= 0)
 608                                 dupl++;
 609                         offs = i;
 610                         break;
 611                 }
 612
 613                 /* Check: duplicate auxiliary arguments. */
 614
 615                 if (dupl)
 616                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_ARGVREP))
 617                                 return(0);
 618
 619                 /* Check: multiple list types. */
 620
 621                 if (LIST__NONE != lt && n->data.list != LIST__NONE)
 622                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_LISTREP))
 623                                 return(0);
 624
 625                 /* Assign list type. */
 626
 627                 if (LIST__NONE != lt && n->data.list == LIST__NONE)
 628                         n->data.list = lt;
 629
 630                 /* The list type should come first. */
 631
 632                 if (n->data.list == LIST__NONE)
 633                         if (width >= 0 || offs >= 0 || cmpt >= 0)
 634                                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_LISTFIRST))
 635                                         return(0);
 636
 637                 continue;
 638         }
 639
 640         /* Allow lists to default to LIST_item. */
 641
 642         if (LIST__NONE == n->data.list) {
 643                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_LISTTYPE))
 644                         return(0);
 645                 n->data.list = LIST_item;
 646         }
 647
 648         /*
 649          * Validate the width field.  Some list types don't need width
 650          * types and should be warned about them.  Others should have it
 651          * and must also be warned.
 652          */
 653
 654         switch (n->data.list) {
 655         case (LIST_tag):
 656                 if (width >= 0)
 657                         break;
 658                 if (mdoc_nmsg(mdoc, n, MANDOCERR_NOWIDTHARG))
 659                         break;
 660                 return(0);
 661         case (LIST_column):
 662                 /* FALLTHROUGH */
 663         case (LIST_diag):
 664                 /* FALLTHROUGH */
 665         case (LIST_ohang):
 666                 /* FALLTHROUGH */
 667         case (LIST_inset):
 668                 /* FALLTHROUGH */
 669         case (LIST_item):
 670                 if (width < 0)
 671                         break;
 672                 if (mdoc_nmsg(mdoc, n, MANDOCERR_WIDTHARG))
 673                         break;
 674                 return(0);
 675         default:
 676                 break;
 677         }
 678
 679         return(1);
 680 }
 681
 682
 683 static int
 684 pre_bd(PRE_ARGS)
 685 {
 686         int              i;
 687         enum mdoc_disp   dt;
 688
 689         if (MDOC_BLOCK != n->type) {
 690                 assert(n->parent);
 691                 assert(MDOC_BLOCK == n->parent->type);
 692                 assert(MDOC_Bd == n->parent->tok);
 693                 assert(DISP__NONE != n->parent->data.disp);
 694                 n->data.disp = n->parent->data.disp;
 695                 return(1);
 696         }
 697
 698         assert(DISP__NONE == n->data.disp);
 699
 700         /* LINTED */
 701         for (i = 0; n->args && i < (int)n->args->argc; i++) {
 702                 dt = DISP__NONE;
 703                 switch (n->args->argv[i].arg) {
 704                 case (MDOC_Centred):
 705                         dt = DISP_centred;
 706                         break;
 707                 case (MDOC_Ragged):
 708                         dt = DISP_ragged;
 709                         break;
 710                 case (MDOC_Unfilled):
 711                         dt = DISP_unfilled;
 712                         break;
 713                 case (MDOC_Filled):
 714                         dt = DISP_filled;
 715                         break;
 716                 case (MDOC_Literal):
 717                         dt = DISP_literal;
 718                         break;
 719                 case (MDOC_File):
 720                         mdoc_nmsg(mdoc, n, MANDOCERR_BADDISP);
 721                         return(0);
 722                 case (MDOC_Offset):
 723                         /* FALLTHROUGH */
 724                 case (MDOC_Compact):
 725                         /* FALLTHROUGH */
 726                 default:
 727                         break;
 728                 }
 729
 730                 if (DISP__NONE != dt && n->data.disp != DISP__NONE)
 731                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_DISPREP))
 732                                 return(0);
 733
 734                 if (DISP__NONE != dt && n->data.disp == DISP__NONE)
 735                         n->data.disp = dt;
 736         }
 737
 738         if (DISP__NONE == n->data.disp) {
 739                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_DISPTYPE))
 740                         return(0);
 741                 n->data.disp = DISP_ragged;
 742         }
 743
 744         return(1);
 745 }
 746
 747
 748 static int
 749 pre_ss(PRE_ARGS)
 750 {
 751
 752         if (MDOC_BLOCK != n->type)
 753                 return(1);
 754         return(check_parent(mdoc, n, MDOC_Sh, MDOC_BODY));
 755 }
 756
 757
 758 static int
 759 pre_sh(PRE_ARGS)
 760 {
 761
 762         if (MDOC_BLOCK != n->type)
 763                 return(1);
 764         return(check_parent(mdoc, n, MDOC_MAX, MDOC_ROOT));
 765 }
 766
 767
 768 static int
 769 pre_it(PRE_ARGS)
 770 {
 771
 772         if (MDOC_BLOCK != n->type)
 773                 return(1);
 774         /*
 775          * FIXME: this can probably be lifted if we make the It into
 776          * something else on-the-fly?
 777          */
 778         return(check_parent(mdoc, n, MDOC_Bl, MDOC_BODY));
 779 }
 780
 781
 782 static int
 783 pre_an(PRE_ARGS)
 784 {
 785
 786         if (NULL == n->args || 1 == n->args->argc)
 787                 return(1);
 788         mdoc_vmsg(mdoc, MANDOCERR_SYNTARGCOUNT,
 789                                 n->line, n->pos,
 790                                 "line arguments == 1 (have %d)",
 791                                 n->args->argc);
 792         return(0);
 793 }
 794
 795
 796 static int
 797 pre_rv(PRE_ARGS)
 798 {
 799
 800         return(check_stdarg(mdoc, n));
 801 }
 802
 803
 804 static int
 805 post_dt(POST_ARGS)
 806 {
 807         const struct mdoc_node *nn;
 808         const char      *p;
 809
 810         if (NULL != (nn = mdoc->last->child))
 811                 for (p = nn->string; *p; p++) {
 812                         if (toupper((u_char)*p) == *p)
 813                                 continue;
 814                         if ( ! mdoc_nmsg(mdoc, nn, MANDOCERR_UPPERCASE))
 815                                 return(0);
 816                         break;
 817                 }
 818
 819         return(1);
 820 }
 821
 822
 823 static int
 824 pre_dt(PRE_ARGS)
 825 {
 826
 827         if (0 == mdoc->meta.date || mdoc->meta.os)
 828                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO))
 829                         return(0);
 830         if (mdoc->meta.title)
 831                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP))
 832                         return(0);
 833         return(1);
 834 }
 835
 836
 837 static int
 838 pre_os(PRE_ARGS)
 839 {
 840
 841         if (NULL == mdoc->meta.title || 0 == mdoc->meta.date)
 842                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO))
 843                         return(0);
 844         if (mdoc->meta.os)
 845                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP))
 846                         return(0);
 847         return(1);
 848 }
 849
 850
 851 static int
 852 pre_dd(PRE_ARGS)
 853 {
 854
 855         if (mdoc->meta.title || mdoc->meta.os)
 856                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO))
 857                         return(0);
 858         if (mdoc->meta.date)
 859                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP))
 860                         return(0);
 861         return(1);
 862 }
 863
 864
 865 static int
 866 post_bf(POST_ARGS)
 867 {
 868         char             *p;
 869         struct mdoc_node *head;
 870
 871         if (MDOC_BLOCK != mdoc->last->type)
 872                 return(1);
 873
 874         head = mdoc->last->head;
 875
 876         if (mdoc->last->args && head->child) {
 877                 /* FIXME: this should provide a default. */
 878                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SYNTARGVCOUNT);
 879                 return(0);
 880         } else if (mdoc->last->args)
 881                 return(1);
 882
 883         if (NULL == head->child || MDOC_TEXT != head->child->type) {
 884                 /* FIXME: this should provide a default. */
 885                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SYNTARGVCOUNT);
 886                 return(0);
 887         }
 888
 889         p = head->child->string;
 890
 891         if (0 == strcmp(p, "Em"))
 892                 return(1);
 893         else if (0 == strcmp(p, "Li"))
 894                 return(1);
 895         else if (0 == strcmp(p, "Sy"))
 896                 return(1);
 897
 898         mdoc_nmsg(mdoc, head, MANDOCERR_FONTTYPE);
 899         return(0);
 900 }
 901
 902
 903 static int
 904 post_lb(POST_ARGS)
 905 {
 906
 907         if (mdoc_a2lib(mdoc->last->child->string))
 908                 return(1);
 909         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADLIB));
 910 }
 911
 912
 913 static int
 914 post_eoln(POST_ARGS)
 915 {
 916
 917         if (NULL == mdoc->last->child)
 918                 return(1);
 919         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGSLOST));
 920 }
 921
 922
 923 static int
 924 post_vt(POST_ARGS)
 925 {
 926         const struct mdoc_node *n;
 927
 928         /*
 929          * The Vt macro comes in both ELEM and BLOCK form, both of which
 930          * have different syntaxes (yet more context-sensitive
 931          * behaviour).  ELEM types must have a child; BLOCK types,
 932          * specifically the BODY, should only have TEXT children.
 933          */
 934
 935         if (MDOC_ELEM == mdoc->last->type)
 936                 return(eerr_ge1(mdoc));
 937         if (MDOC_BODY != mdoc->last->type)
 938                 return(1);
 939
 940         for (n = mdoc->last->child; n; n = n->next)
 941                 if (MDOC_TEXT != n->type)
 942                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_CHILD))
 943                                 return(0);
 944
 945         return(1);
 946 }
 947
 948
 949 static int
 950 post_nm(POST_ARGS)
 951 {
 952
 953         if (mdoc->last->child)
 954                 return(1);
 955         if (mdoc->meta.name)
 956                 return(1);
 957         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NONAME));
 958 }
 959
 960
 961 static int
 962 post_at(POST_ARGS)
 963 {
 964
 965         if (NULL == mdoc->last->child)
 966                 return(1);
 967         assert(MDOC_TEXT == mdoc->last->child->type);
 968         if (mdoc_a2att(mdoc->last->child->string))
 969                 return(1);
 970         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADATT));
 971 }
 972
 973
 974 static int
 975 post_an(POST_ARGS)
 976 {
 977
 978         if (mdoc->last->args) {
 979                 if (NULL == mdoc->last->child)
 980                         return(1);
 981                 return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGCOUNT));
 982         }
 983
 984         if (mdoc->last->child)
 985                 return(1);
 986         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS));
 987 }
 988
 989
 990 static int
 991 post_it(POST_ARGS)
 992 {
 993         int               i, cols, rc;
 994         enum mdoc_list    lt;
 995         struct mdoc_node *n, *c;
 996         enum mandocerr    er;
 997
 998         if (MDOC_BLOCK != mdoc->last->type)
 999                 return(1);
1000
1001         n = mdoc->last->parent->parent;
1002         lt = n->data.list;
1003
1004         if (LIST__NONE == lt) {
1005                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_LISTTYPE);
1006                 return(0);
1007         }
1008
1009         switch (lt) {
1010         case (LIST_tag):
1011                 if (mdoc->last->head->child)
1012                         break;
1013                 /* FIXME: give this a dummy value. */
1014                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS))
1015                         return(0);
1016                 break;
1017         case (LIST_hang):
1018                 /* FALLTHROUGH */
1019         case (LIST_ohang):
1020                 /* FALLTHROUGH */
1021         case (LIST_inset):
1022                 /* FALLTHROUGH */
1023         case (LIST_diag):
1024                 if (NULL == mdoc->last->head->child)
1025                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS))
1026                                 return(0);
1027                 if (NULL == mdoc->last->body->child)
1028                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY))
1029                                 return(0);
1030                 break;
1031         case (LIST_bullet):
1032                 /* FALLTHROUGH */
1033         case (LIST_dash):
1034                 /* FALLTHROUGH */
1035         case (LIST_enum):
1036                 /* FALLTHROUGH */
1037         case (LIST_hyphen):
1038                 /* FALLTHROUGH */
1039         case (LIST_item):
1040                 if (mdoc->last->head->child)
1041                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGSLOST))
1042                                 return(0);
1043                 if (NULL == mdoc->last->body->child)
1044                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY))
1045                                 return(0);
1046                 break;
1047         case (LIST_column):
1048                 cols = -1;
1049                 for (i = 0; i < (int)n->args->argc; i++)
1050                         if (MDOC_Column == n->args->argv[i].arg) {
1051                                 cols = (int)n->args->argv[i].sz;
1052                                 break;
1053                         }
1054
1055                 assert(-1 != cols);
1056                 assert(NULL == mdoc->last->head->child);
1057
1058                 if (NULL == mdoc->last->body->child)
1059                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY))
1060                                 return(0);
1061
1062                 for (i = 0, c = mdoc->last->child; c; c = c->next)
1063                         if (MDOC_BODY == c->type)
1064                                 i++;
1065
1066                 if (i < cols)
1067                         er = MANDOCERR_ARGCOUNT;
1068                 else if (i == cols || i == cols + 1)
1069                         break;
1070                 else
1071                         er = MANDOCERR_SYNTARGCOUNT;
1072
1073                 rc = mdoc_vmsg(mdoc, er,
1074                                 mdoc->last->line, mdoc->last->pos,
1075                                 "columns == %d (have %d)", cols, i);
1076                 return(rc);
1077         default:
1078                 break;
1079         }
1080
1081         return(1);
1082 }
1083
1084
1085 static int
1086 post_bl_head(POST_ARGS)
1087 {
1088         int               i;
1089         struct mdoc_node *n;
1090
1091         assert(mdoc->last->parent);
1092         n = mdoc->last->parent;
1093
1094         if (LIST_column == n->data.list) {
1095                 for (i = 0; i < (int)n->args->argc; i++)
1096                         if (MDOC_Column == n->args->argv[i].arg)
1097                                 break;
1098                 assert(i < (int)n->args->argc);
1099
1100                 if (n->args->argv[i].sz && mdoc->last->nchild) {
1101                         mdoc_nmsg(mdoc, n, MANDOCERR_COLUMNS);
1102                         return(0);
1103                 }
1104                 return(1);
1105         }
1106
1107         if (0 == (i = mdoc->last->nchild))
1108                 return(1);
1109         return(warn_count(mdoc, "==", 0, "line arguments", i));
1110 }
1111
1112
1113 static int
1114 post_bl(POST_ARGS)
1115 {
1116         struct mdoc_node        *n;
1117
1118         if (MDOC_HEAD == mdoc->last->type)
1119                 return(post_bl_head(mdoc));
1120         if (MDOC_BODY != mdoc->last->type)
1121                 return(1);
1122         if (NULL == mdoc->last->child)
1123                 return(1);
1124
1125         /*
1126          * We only allow certain children of `Bl'.  This is usually on
1127          * `It', but apparently `Sm' occurs here and there, so we let
1128          * that one through, too.
1129          */
1130
1131         /* LINTED */
1132         for (n = mdoc->last->child; n; n = n->next) {
1133                 if (MDOC_BLOCK == n->type && MDOC_It == n->tok)
1134                         continue;
1135                 if (MDOC_Sm == n->tok)
1136                         continue;
1137                 mdoc_nmsg(mdoc, n, MANDOCERR_SYNTCHILD);
1138                 return(0);
1139         }
1140
1141         return(1);
1142 }
1143
1144
1145 static int
1146 ebool(struct mdoc *mdoc)
1147 {
1148         struct mdoc_node *n;
1149
1150         /* LINTED */
1151         for (n = mdoc->last->child; n; n = n->next) {
1152                 if (MDOC_TEXT != n->type)
1153                         break;
1154                 if (0 == strcmp(n->string, "on"))
1155                         continue;
1156                 if (0 == strcmp(n->string, "off"))
1157                         continue;
1158                 break;
1159         }
1160
1161         if (NULL == n)
1162                 return(1);
1163         return(mdoc_nmsg(mdoc, n, MANDOCERR_BADBOOL));
1164 }
1165
1166
1167 static int
1168 post_root(POST_ARGS)
1169 {
1170
1171         if (NULL == mdoc->first->child)
1172                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCBODY);
1173         else if ( ! (MDOC_PBODY & mdoc->flags))
1174                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCPROLOG);
1175         else if (MDOC_BLOCK != mdoc->first->child->type)
1176                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCBODY);
1177         else if (MDOC_Sh != mdoc->first->child->tok)
1178                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCBODY);
1179         else
1180                 return(1);
1181
1182         return(0);
1183 }
1184
1185
1186 static int
1187 post_st(POST_ARGS)
1188 {
1189
1190         if (mdoc_a2st(mdoc->last->child->string))
1191                 return(1);
1192         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADSTANDARD));
1193 }
1194
1195
1196 static int
1197 post_rs(POST_ARGS)
1198 {
1199         struct mdoc_node        *nn;
1200
1201         if (MDOC_BODY != mdoc->last->type)
1202                 return(1);
1203
1204         for (nn = mdoc->last->child; nn; nn = nn->next)
1205                 switch (nn->tok) {
1206                 case(MDOC__U):
1207                         /* FALLTHROUGH */
1208                 case(MDOC__Q):
1209                         /* FALLTHROUGH */
1210                 case(MDOC__C):
1211                         /* FALLTHROUGH */
1212                 case(MDOC__A):
1213                         /* FALLTHROUGH */
1214                 case(MDOC__B):
1215                         /* FALLTHROUGH */
1216                 case(MDOC__D):
1217                         /* FALLTHROUGH */
1218                 case(MDOC__I):
1219                         /* FALLTHROUGH */
1220                 case(MDOC__J):
1221                         /* FALLTHROUGH */
1222                 case(MDOC__N):
1223                         /* FALLTHROUGH */
1224                 case(MDOC__O):
1225                         /* FALLTHROUGH */
1226                 case(MDOC__P):
1227                         /* FALLTHROUGH */
1228                 case(MDOC__R):
1229                         /* FALLTHROUGH */
1230                 case(MDOC__T):
1231                         /* FALLTHROUGH */
1232                 case(MDOC__V):
1233                         break;
1234                 default:
1235                         mdoc_nmsg(mdoc, nn, MANDOCERR_SYNTCHILD);
1236                         return(0);
1237                 }
1238
1239         return(1);
1240 }
1241
1242
1243 static int
1244 post_sh(POST_ARGS)
1245 {
1246
1247         if (MDOC_HEAD == mdoc->last->type)
1248                 return(post_sh_head(mdoc));
1249         if (MDOC_BODY == mdoc->last->type)
1250                 return(post_sh_body(mdoc));
1251
1252         return(1);
1253 }
1254
1255
1256 static int
1257 post_sh_body(POST_ARGS)
1258 {
1259         struct mdoc_node *n;
1260
1261         if (SEC_NAME != mdoc->lastsec)
1262                 return(1);
1263
1264         /*
1265          * Warn if the NAME section doesn't contain the `Nm' and `Nd'
1266          * macros (can have multiple `Nm' and one `Nd').  Note that the
1267          * children of the BODY declaration can also be "text".
1268          */
1269
1270         if (NULL == (n = mdoc->last->child))
1271                 return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC));
1272
1273         for ( ; n && n->next; n = n->next) {
1274                 if (MDOC_ELEM == n->type && MDOC_Nm == n->tok)
1275                         continue;
1276                 if (MDOC_TEXT == n->type)
1277                         continue;
1278                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC))
1279                         return(0);
1280         }
1281
1282         assert(n);
1283         if (MDOC_BLOCK == n->type && MDOC_Nd == n->tok)
1284                 return(1);
1285         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC));
1286 }
1287
1288
1289 static int
1290 post_sh_head(POST_ARGS)
1291 {
1292         char                    buf[BUFSIZ];
1293         enum mdoc_sec           sec;
1294         const struct mdoc_node *n;
1295
1296         /*
1297          * Process a new section.  Sections are either "named" or
1298          * "custom"; custom sections are user-defined, while named ones
1299          * usually follow a conventional order and may only appear in
1300          * certain manual sections.
1301          */
1302
1303         buf[0] = '\0';
1304
1305         /*
1306          * FIXME: yes, these can use a dynamic buffer, but I don't do so
1307          * in the interests of simplicity.
1308          */
1309
1310         for (n = mdoc->last->child; n; n = n->next) {
1311                 /* XXX - copied from compact(). */
1312                 assert(MDOC_TEXT == n->type);
1313
1314                 if (strlcat(buf, n->string, BUFSIZ) >= BUFSIZ) {
1315                         mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
1316                         return(0);
1317                 }
1318                 if (NULL == n->next)
1319                         continue;
1320                 if (strlcat(buf, " ", BUFSIZ) >= BUFSIZ) {
1321                         mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
1322                         return(0);
1323                 }
1324         }
1325
1326         sec = mdoc_str2sec(buf);
1327
1328         /*
1329          * Check: NAME should always be first, CUSTOM has no roles,
1330          * non-CUSTOM has a conventional order to be followed.
1331          */
1332
1333         if (SEC_NAME != sec && SEC_NONE == mdoc->lastnamed)
1334                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NAMESECFIRST))
1335                         return(0);
1336
1337         if (SEC_CUSTOM == sec)
1338                 return(1);
1339
1340         if (sec == mdoc->lastnamed)
1341                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECREP))
1342                         return(0);
1343
1344         if (sec < mdoc->lastnamed)
1345                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECOOO))
1346                         return(0);
1347
1348         /*
1349          * Check particular section/manual conventions.  LIBRARY can
1350          * only occur in manual section 2, 3, and 9.
1351          */
1352
1353         switch (sec) {
1354         case (SEC_LIBRARY):
1355                 assert(mdoc->meta.msec);
1356                 if (*mdoc->meta.msec == '2')
1357                         break;
1358                 if (*mdoc->meta.msec == '3')
1359                         break;
1360                 if (*mdoc->meta.msec == '9')
1361                         break;
1362                 return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECMSEC));
1363         default:
1364                 break;
1365         }
1366
1367         return(1);
1368 }