man_macro.c

   1 /*      $Id: man_macro.c,v 1.144 2019/01/05 18:59:46 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2012-2015, 2017-2019 Ingo Schwarze <schwarze@openbsd.org>
   5  * Copyright (c) 2013 Franco Fichtner <franco@lastsummer.de>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include "config.h"
  20
  21 #include <sys/types.h>
  22
  23 #include <assert.h>
  24 #include <ctype.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "mandoc.h"
  30 #include "roff.h"
  31 #include "man.h"
  32 #include "libmandoc.h"
  33 #include "roff_int.h"
  34 #include "libman.h"
  35
  36 static  void             blk_close(MACRO_PROT_ARGS);
  37 static  void             blk_exp(MACRO_PROT_ARGS);
  38 static  void             blk_imp(MACRO_PROT_ARGS);
  39 static  void             in_line_eoln(MACRO_PROT_ARGS);
  40 static  int              man_args(struct roff_man *, int,
  41                                 int *, char *, char **);
  42 static  void             rew_scope(struct roff_man *, enum roff_tok);
  43
  44 static const struct man_macro man_macros[MAN_MAX - MAN_TH] = {
  45         { in_line_eoln, MAN_XSCOPE }, /* TH */
  46         { blk_imp, MAN_XSCOPE | MAN_BSCOPED }, /* SH */
  47         { blk_imp, MAN_XSCOPE | MAN_BSCOPED }, /* SS */
  48         { blk_imp, MAN_XSCOPE | MAN_BSCOPED }, /* TP */
  49         { blk_imp, MAN_XSCOPE | MAN_BSCOPED }, /* TQ */
  50         { blk_imp, MAN_XSCOPE }, /* LP */
  51         { blk_imp, MAN_XSCOPE }, /* PP */
  52         { blk_imp, MAN_XSCOPE }, /* P */
  53         { blk_imp, MAN_XSCOPE }, /* IP */
  54         { blk_imp, MAN_XSCOPE }, /* HP */
  55         { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* SM */
  56         { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* SB */
  57         { in_line_eoln, 0 }, /* BI */
  58         { in_line_eoln, 0 }, /* IB */
  59         { in_line_eoln, 0 }, /* BR */
  60         { in_line_eoln, 0 }, /* RB */
  61         { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* R */
  62         { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* B */
  63         { in_line_eoln, MAN_NSCOPED | MAN_ESCOPED | MAN_JOIN }, /* I */
  64         { in_line_eoln, 0 }, /* IR */
  65         { in_line_eoln, 0 }, /* RI */
  66         { blk_close, MAN_XSCOPE }, /* RE */
  67         { blk_exp, MAN_XSCOPE }, /* RS */
  68         { in_line_eoln, 0 }, /* DT */
  69         { in_line_eoln, 0 }, /* UC */
  70         { in_line_eoln, MAN_NSCOPED }, /* PD */
  71         { in_line_eoln, 0 }, /* AT */
  72         { in_line_eoln, MAN_NSCOPED }, /* in */
  73         { blk_imp, MAN_XSCOPE }, /* SY */
  74         { blk_close, MAN_XSCOPE }, /* YS */
  75         { in_line_eoln, 0 }, /* OP */
  76         { in_line_eoln, MAN_XSCOPE }, /* EX */
  77         { in_line_eoln, MAN_XSCOPE }, /* EE */
  78         { blk_exp, MAN_XSCOPE }, /* UR */
  79         { blk_close, MAN_XSCOPE }, /* UE */
  80         { blk_exp, MAN_XSCOPE }, /* MT */
  81         { blk_close, MAN_XSCOPE }, /* ME */
  82 };
  83
  84
  85 const struct man_macro *
  86 man_macro(enum roff_tok tok)
  87 {
  88         assert(tok >= MAN_TH && tok <= MAN_MAX);
  89         return man_macros + (tok - MAN_TH);
  90 }
  91
  92 void
  93 man_unscope(struct roff_man *man, const struct roff_node *to)
  94 {
  95         struct roff_node *n;
  96
  97         to = to->parent;
  98         n = man->last;
  99         while (n != to) {
 100
 101                 /* Reached the end of the document? */
 102
 103                 if (to == NULL && ! (n->flags & NODE_VALID)) {
 104                         if (man->flags & (MAN_BLINE | MAN_ELINE) &&
 105                             man_macro(n->tok)->flags &
 106                              (MAN_BSCOPED | MAN_NSCOPED)) {
 107                                 mandoc_msg(MANDOCERR_BLK_LINE,
 108                                     n->line, n->pos,
 109                                     "EOF breaks %s", roff_name[n->tok]);
 110                                 if (man->flags & MAN_ELINE)
 111                                         man->flags &= ~MAN_ELINE;
 112                                 else {
 113                                         assert(n->type == ROFFT_HEAD);
 114                                         n = n->parent;
 115                                         man->flags &= ~MAN_BLINE;
 116                                 }
 117                                 man->last = n;
 118                                 n = n->parent;
 119                                 roff_node_delete(man, man->last);
 120                                 continue;
 121                         }
 122                         if (n->type == ROFFT_BLOCK &&
 123                             man_macro(n->tok)->fp == blk_exp)
 124                                 mandoc_msg(MANDOCERR_BLK_NOEND,
 125                                     n->line, n->pos, "%s",
 126                                     roff_name[n->tok]);
 127                 }
 128
 129                 /*
 130                  * We might delete the man->last node
 131                  * in the post-validation phase.
 132                  * Save a pointer to the parent such that
 133                  * we know where to continue the iteration.
 134                  */
 135
 136                 man->last = n;
 137                 n = n->parent;
 138                 man->last->flags |= NODE_VALID;
 139         }
 140
 141         /*
 142          * If we ended up at the parent of the node we were
 143          * supposed to rewind to, that means the target node
 144          * got deleted, so add the next node we parse as a child
 145          * of the parent instead of as a sibling of the target.
 146          */
 147
 148         man->next = (man->last == to) ?
 149             ROFF_NEXT_CHILD : ROFF_NEXT_SIBLING;
 150 }
 151
 152 /*
 153  * Rewinding entails ascending the parse tree until a coherent point,
 154  * for example, the `SH' macro will close out any intervening `SS'
 155  * scopes.  When a scope is closed, it must be validated and actioned.
 156  */
 157 static void
 158 rew_scope(struct roff_man *man, enum roff_tok tok)
 159 {
 160         struct roff_node *n;
 161
 162         /* Preserve empty paragraphs before RS. */
 163
 164         n = man->last;
 165         if (tok == MAN_RS && n->child == NULL &&
 166             (n->tok == MAN_P || n->tok == MAN_PP || n->tok == MAN_LP))
 167                 return;
 168
 169         for (;;) {
 170                 if (n->type == ROFFT_ROOT)
 171                         return;
 172                 if (n->flags & NODE_VALID) {
 173                         n = n->parent;
 174                         continue;
 175                 }
 176                 if (n->type != ROFFT_BLOCK) {
 177                         if (n->parent->type == ROFFT_ROOT) {
 178                                 man_unscope(man, n);
 179                                 return;
 180                         } else {
 181                                 n = n->parent;
 182                                 continue;
 183                         }
 184                 }
 185                 if (tok != MAN_SH && (n->tok == MAN_SH ||
 186                     (tok != MAN_SS && (n->tok == MAN_SS ||
 187                      man_macro(n->tok)->fp == blk_exp))))
 188                         return;
 189                 man_unscope(man, n);
 190                 n = man->last;
 191         }
 192 }
 193
 194
 195 /*
 196  * Close out a generic explicit macro.
 197  */
 198 void
 199 blk_close(MACRO_PROT_ARGS)
 200 {
 201         enum roff_tok            ctok, ntok;
 202         const struct roff_node  *nn;
 203         char                    *p, *ep;
 204         int                      cline, cpos, la, nrew, target;
 205
 206         nrew = 1;
 207         switch (tok) {
 208         case MAN_RE:
 209                 ntok = MAN_RS;
 210                 la = *pos;
 211                 if ( ! man_args(man, line, pos, buf, &p))
 212                         break;
 213                 for (nn = man->last->parent; nn; nn = nn->parent)
 214                         if (nn->tok == ntok && nn->type == ROFFT_BLOCK)
 215                                 nrew++;
 216                 target = strtol(p, &ep, 10);
 217                 if (*ep != '\0')
 218                         mandoc_msg(MANDOCERR_ARG_EXCESS, line,
 219                             la + (buf[la] == '"') + (int)(ep - p),
 220                             "RE ... %s", ep);
 221                 free(p);
 222                 if (target == 0)
 223                         target = 1;
 224                 nrew -= target;
 225                 if (nrew < 1) {
 226                         mandoc_msg(MANDOCERR_RE_NOTOPEN,
 227                             line, ppos, "RE %d", target);
 228                         return;
 229                 }
 230                 break;
 231         case MAN_YS:
 232                 ntok = MAN_SY;
 233                 break;
 234         case MAN_UE:
 235                 ntok = MAN_UR;
 236                 break;
 237         case MAN_ME:
 238                 ntok = MAN_MT;
 239                 break;
 240         default:
 241                 abort();
 242         }
 243
 244         for (nn = man->last->parent; nn; nn = nn->parent)
 245                 if (nn->tok == ntok && nn->type == ROFFT_BLOCK && ! --nrew)
 246                         break;
 247
 248         if (nn == NULL) {
 249                 mandoc_msg(MANDOCERR_BLK_NOTOPEN,
 250                     line, ppos, "%s", roff_name[tok]);
 251                 rew_scope(man, MAN_PP);
 252                 if (tok == MAN_RE) {
 253                         roff_elem_alloc(man, line, ppos, ROFF_br);
 254                         man->last->flags |= NODE_LINE |
 255                             NODE_VALID | NODE_ENDED;
 256                         man->next = ROFF_NEXT_SIBLING;
 257                 }
 258                 return;
 259         }
 260
 261         cline = man->last->line;
 262         cpos = man->last->pos;
 263         ctok = man->last->tok;
 264         man_unscope(man, nn);
 265
 266         if (tok == MAN_RE && nn->head->aux > 0)
 267                 roff_setreg(man->roff, "an-margin", nn->head->aux, '-');
 268
 269         /* Trailing text. */
 270
 271         if (buf[*pos] != '\0') {
 272                 roff_word_alloc(man, line, ppos, buf + *pos);
 273                 man->last->flags |= NODE_DELIMC;
 274                 if (mandoc_eos(man->last->string, strlen(man->last->string)))
 275                         man->last->flags |= NODE_EOS;
 276         }
 277
 278         /* Move a trailing paragraph behind the block. */
 279
 280         if (ctok == MAN_LP || ctok == MAN_PP || ctok == MAN_P) {
 281                 *pos = strlen(buf);
 282                 blk_imp(man, ctok, cline, cpos, pos, buf);
 283         }
 284
 285         /* Synopsis blocks need an explicit end marker for spacing. */
 286
 287         if (tok == MAN_YS && man->last == nn) {
 288                 roff_elem_alloc(man, line, ppos, tok);
 289                 man_unscope(man, man->last);
 290         }
 291 }
 292
 293 void
 294 blk_exp(MACRO_PROT_ARGS)
 295 {
 296         struct roff_node *head;
 297         char            *p;
 298         int              la;
 299
 300         if (tok == MAN_RS) {
 301                 rew_scope(man, tok);
 302                 man->flags |= ROFF_NONOFILL;
 303         }
 304         roff_block_alloc(man, line, ppos, tok);
 305         head = roff_head_alloc(man, line, ppos, tok);
 306
 307         la = *pos;
 308         if (man_args(man, line, pos, buf, &p)) {
 309                 roff_word_alloc(man, line, la, p);
 310                 if (tok == MAN_RS) {
 311                         if (roff_getreg(man->roff, "an-margin") == 0)
 312                                 roff_setreg(man->roff, "an-margin",
 313                                     7 * 24, '=');
 314                         if ((head->aux = strtod(p, NULL) * 24.0) > 0)
 315                                 roff_setreg(man->roff, "an-margin",
 316                                     head->aux, '+');
 317                 }
 318                 free(p);
 319         }
 320
 321         if (buf[*pos] != '\0')
 322                 mandoc_msg(MANDOCERR_ARG_EXCESS, line, *pos,
 323                     "%s ... %s", roff_name[tok], buf + *pos);
 324
 325         man_unscope(man, head);
 326         roff_body_alloc(man, line, ppos, tok);
 327         man->flags &= ~ROFF_NONOFILL;
 328 }
 329
 330 /*
 331  * Parse an implicit-block macro.  These contain a ROFFT_HEAD and a
 332  * ROFFT_BODY contained within a ROFFT_BLOCK.  Rules for closing out other
 333  * scopes, such as `SH' closing out an `SS', are defined in the rew
 334  * routines.
 335  */
 336 void
 337 blk_imp(MACRO_PROT_ARGS)
 338 {
 339         int              la;
 340         char            *p;
 341         struct roff_node *n;
 342
 343         rew_scope(man, tok);
 344         man->flags |= ROFF_NONOFILL;
 345         if (tok == MAN_SH || tok == MAN_SS)
 346                 man->flags &= ~ROFF_NOFILL;
 347         roff_block_alloc(man, line, ppos, tok);
 348         n = roff_head_alloc(man, line, ppos, tok);
 349
 350         /* Add line arguments. */
 351
 352         for (;;) {
 353                 la = *pos;
 354                 if ( ! man_args(man, line, pos, buf, &p))
 355                         break;
 356                 roff_word_alloc(man, line, la, p);
 357                 free(p);
 358         }
 359
 360         /*
 361          * For macros having optional next-line scope,
 362          * keep the head open if there were no arguments.
 363          * For `TP' and `TQ', always keep the head open.
 364          */
 365
 366         if (man_macro(tok)->flags & MAN_BSCOPED &&
 367             (tok == MAN_TP || tok == MAN_TQ || n == man->last)) {
 368                 man->flags |= MAN_BLINE;
 369                 return;
 370         }
 371
 372         /* Close out the head and open the body. */
 373
 374         man_unscope(man, n);
 375         roff_body_alloc(man, line, ppos, tok);
 376         man->flags &= ~ROFF_NONOFILL;
 377 }
 378
 379 void
 380 in_line_eoln(MACRO_PROT_ARGS)
 381 {
 382         int              la;
 383         char            *p;
 384         struct roff_node *n;
 385
 386         roff_elem_alloc(man, line, ppos, tok);
 387         n = man->last;
 388
 389         if (tok == MAN_EX)
 390                 man->flags |= ROFF_NOFILL;
 391         else if (tok == MAN_EE)
 392                 man->flags &= ~ROFF_NOFILL;
 393
 394         for (;;) {
 395                 if (buf[*pos] != '\0' && man->last != n && tok == MAN_PD) {
 396                         mandoc_msg(MANDOCERR_ARG_EXCESS, line, *pos,
 397                             "%s ... %s", roff_name[tok], buf + *pos);
 398                         break;
 399                 }
 400                 la = *pos;
 401                 if ( ! man_args(man, line, pos, buf, &p))
 402                         break;
 403                 if (man_macro(tok)->flags & MAN_JOIN &&
 404                     man->last->type == ROFFT_TEXT)
 405                         roff_word_append(man, p);
 406                 else
 407                         roff_word_alloc(man, line, la, p);
 408                 free(p);
 409         }
 410
 411         /*
 412          * Append NODE_EOS in case the last snipped argument
 413          * ends with a dot, e.g. `.IR syslog (3).'
 414          */
 415
 416         if (n != man->last &&
 417             mandoc_eos(man->last->string, strlen(man->last->string)))
 418                 man->last->flags |= NODE_EOS;
 419
 420         /*
 421          * If no arguments are specified and this is MAN_ESCOPED (i.e.,
 422          * next-line scoped), then set our mode to indicate that we're
 423          * waiting for terms to load into our context.
 424          */
 425
 426         if (n == man->last && man_macro(tok)->flags & MAN_ESCOPED) {
 427                 man->flags |= MAN_ELINE;
 428                 return;
 429         }
 430
 431         assert(man->last->type != ROFFT_ROOT);
 432         man->next = ROFF_NEXT_SIBLING;
 433
 434         /* Rewind our element scope. */
 435
 436         for ( ; man->last; man->last = man->last->parent) {
 437                 man->last->flags |= NODE_VALID;
 438                 if (man->last == n)
 439                         break;
 440         }
 441
 442         /* Rewind next-line scoped ancestors, if any. */
 443
 444         if (man_macro(tok)->flags & MAN_ESCOPED)
 445                 man_descope(man, line, ppos, NULL);
 446 }
 447
 448 void
 449 man_endparse(struct roff_man *man)
 450 {
 451         man_unscope(man, man->meta.first);
 452 }
 453
 454 static int
 455 man_args(struct roff_man *man, int line, int *pos, char *buf, char **v)
 456 {
 457         char     *start;
 458
 459         assert(*pos);
 460         *v = start = buf + *pos;
 461         assert(' ' != *start);
 462
 463         if ('\0' == *start)
 464                 return 0;
 465
 466         *v = roff_getarg(man->roff, v, line, pos);
 467         return 1;
 468 }