mdoc_argv.c

   1 /*      $Id: mdoc_argv.c,v 1.52 2010/05/31 13:39:13 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
   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 <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "mandoc.h"
  30 #include "libmdoc.h"
  31 #include "libmandoc.h"
  32
  33 /*
  34  * Routines to parse arguments of macros.  Arguments follow the syntax
  35  * of `-arg [val [valN...]]'.  Arguments come in all types:  quoted
  36  * arguments, multiple arguments per value, no-value arguments, etc.
  37  *
  38  * There's no limit to the number or arguments that may be allocated.
  39  */
  40
  41 #define ARGV_NONE       (1 << 0)
  42 #define ARGV_SINGLE     (1 << 1)
  43 #define ARGV_MULTI      (1 << 2)
  44 #define ARGV_OPT_SINGLE (1 << 3)
  45
  46 #define MULTI_STEP       5
  47
  48 static  int              argv_a2arg(enum mdoct, const char *);
  49 static  enum margserr    args(struct mdoc *, int, int *,
  50                                 char *, int, char **);
  51 static  int              argv(struct mdoc *, int,
  52                                 struct mdoc_argv *, int *, char *);
  53 static  int              argv_single(struct mdoc *, int,
  54                                 struct mdoc_argv *, int *, char *);
  55 static  int              argv_opt_single(struct mdoc *, int,
  56                                 struct mdoc_argv *, int *, char *);
  57 static  int              argv_multi(struct mdoc *, int,
  58                                 struct mdoc_argv *, int *, char *);
  59
  60 /* Per-argument flags. */
  61
  62 static  int mdoc_argvflags[MDOC_ARG_MAX] = {
  63         ARGV_NONE,      /* MDOC_Split */
  64         ARGV_NONE,      /* MDOC_Nosplit */
  65         ARGV_NONE,      /* MDOC_Ragged */
  66         ARGV_NONE,      /* MDOC_Unfilled */
  67         ARGV_NONE,      /* MDOC_Literal */
  68         ARGV_SINGLE,    /* MDOC_File */
  69         ARGV_OPT_SINGLE, /* MDOC_Offset */
  70         ARGV_NONE,      /* MDOC_Bullet */
  71         ARGV_NONE,      /* MDOC_Dash */
  72         ARGV_NONE,      /* MDOC_Hyphen */
  73         ARGV_NONE,      /* MDOC_Item */
  74         ARGV_NONE,      /* MDOC_Enum */
  75         ARGV_NONE,      /* MDOC_Tag */
  76         ARGV_NONE,      /* MDOC_Diag */
  77         ARGV_NONE,      /* MDOC_Hang */
  78         ARGV_NONE,      /* MDOC_Ohang */
  79         ARGV_NONE,      /* MDOC_Inset */
  80         ARGV_MULTI,     /* MDOC_Column */
  81         ARGV_SINGLE,    /* MDOC_Width */
  82         ARGV_NONE,      /* MDOC_Compact */
  83         ARGV_NONE,      /* MDOC_Std */
  84         ARGV_NONE,      /* MDOC_Filled */
  85         ARGV_NONE,      /* MDOC_Words */
  86         ARGV_NONE,      /* MDOC_Emphasis */
  87         ARGV_NONE,      /* MDOC_Symbolic */
  88         ARGV_NONE       /* MDOC_Symbolic */
  89 };
  90
  91 static  int mdoc_argflags[MDOC_MAX] = {
  92         0, /* Ap */
  93         0, /* Dd */
  94         0, /* Dt */
  95         0, /* Os */
  96         0, /* Sh */
  97         0, /* Ss */
  98         ARGS_DELIM, /* Pp */
  99         ARGS_DELIM, /* D1 */
 100         ARGS_DELIM, /* Dl */
 101         0, /* Bd */
 102         0, /* Ed */
 103         0, /* Bl */
 104         0, /* El */
 105         0, /* It */
 106         ARGS_DELIM, /* Ad */
 107         ARGS_DELIM, /* An */
 108         ARGS_DELIM, /* Ar */
 109         0, /* Cd */
 110         ARGS_DELIM, /* Cm */
 111         ARGS_DELIM, /* Dv */
 112         ARGS_DELIM, /* Er */
 113         ARGS_DELIM, /* Ev */
 114         0, /* Ex */
 115         ARGS_DELIM, /* Fa */
 116         0, /* Fd */
 117         ARGS_DELIM, /* Fl */
 118         ARGS_DELIM, /* Fn */
 119         ARGS_DELIM, /* Ft */
 120         ARGS_DELIM, /* Ic */
 121         0, /* In */
 122         ARGS_DELIM, /* Li */
 123         0, /* Nd */
 124         ARGS_DELIM, /* Nm */
 125         ARGS_DELIM, /* Op */
 126         0, /* Ot */
 127         ARGS_DELIM, /* Pa */
 128         0, /* Rv */
 129         ARGS_DELIM, /* St */
 130         ARGS_DELIM, /* Va */
 131         ARGS_DELIM, /* Vt */
 132         ARGS_DELIM, /* Xr */
 133         0, /* %A */
 134         0, /* %B */
 135         0, /* %D */
 136         0, /* %I */
 137         0, /* %J */
 138         0, /* %N */
 139         0, /* %O */
 140         0, /* %P */
 141         0, /* %R */
 142         0, /* %T */
 143         0, /* %V */
 144         ARGS_DELIM, /* Ac */
 145         0, /* Ao */
 146         ARGS_DELIM, /* Aq */
 147         ARGS_DELIM, /* At */
 148         ARGS_DELIM, /* Bc */
 149         0, /* Bf */
 150         0, /* Bo */
 151         ARGS_DELIM, /* Bq */
 152         ARGS_DELIM, /* Bsx */
 153         ARGS_DELIM, /* Bx */
 154         0, /* Db */
 155         ARGS_DELIM, /* Dc */
 156         0, /* Do */
 157         ARGS_DELIM, /* Dq */
 158         ARGS_DELIM, /* Ec */
 159         0, /* Ef */
 160         ARGS_DELIM, /* Em */
 161         0, /* Eo */
 162         ARGS_DELIM, /* Fx */
 163         ARGS_DELIM, /* Ms */
 164         ARGS_DELIM, /* No */
 165         ARGS_DELIM, /* Ns */
 166         ARGS_DELIM, /* Nx */
 167         ARGS_DELIM, /* Ox */
 168         ARGS_DELIM, /* Pc */
 169         ARGS_DELIM, /* Pf */
 170         0, /* Po */
 171         ARGS_DELIM, /* Pq */
 172         ARGS_DELIM, /* Qc */
 173         ARGS_DELIM, /* Ql */
 174         0, /* Qo */
 175         ARGS_DELIM, /* Qq */
 176         0, /* Re */
 177         0, /* Rs */
 178         ARGS_DELIM, /* Sc */
 179         0, /* So */
 180         ARGS_DELIM, /* Sq */
 181         0, /* Sm */
 182         ARGS_DELIM, /* Sx */
 183         ARGS_DELIM, /* Sy */
 184         ARGS_DELIM, /* Tn */
 185         ARGS_DELIM, /* Ux */
 186         ARGS_DELIM, /* Xc */
 187         0, /* Xo */
 188         0, /* Fo */
 189         0, /* Fc */
 190         0, /* Oo */
 191         ARGS_DELIM, /* Oc */
 192         0, /* Bk */
 193         0, /* Ek */
 194         0, /* Bt */
 195         0, /* Hf */
 196         0, /* Fr */
 197         0, /* Ud */
 198         0, /* Lb */
 199         ARGS_DELIM, /* Lp */
 200         ARGS_DELIM, /* Lk */
 201         ARGS_DELIM, /* Mt */
 202         ARGS_DELIM, /* Brq */
 203         0, /* Bro */
 204         ARGS_DELIM, /* Brc */
 205         0, /* %C */
 206         0, /* Es */
 207         0, /* En */
 208         0, /* Dx */
 209         0, /* %Q */
 210         0, /* br */
 211         0, /* sp */
 212         0, /* %U */
 213         0, /* Ta */
 214 };
 215
 216
 217 /*
 218  * Parse an argument from line text.  This comes in the form of -key
 219  * [value0...], which may either have a single mandatory value, at least
 220  * one mandatory value, an optional single value, or no value.
 221  */
 222 enum margverr
 223 mdoc_argv(struct mdoc *m, int line, enum mdoct tok,
 224                 struct mdoc_arg **v, int *pos, char *buf)
 225 {
 226         char             *p, sv;
 227         struct mdoc_argv tmp;
 228         struct mdoc_arg  *arg;
 229
 230         if ('\0' == buf[*pos])
 231                 return(ARGV_EOLN);
 232
 233         assert(' ' != buf[*pos]);
 234
 235         /* Parse through to the first unescaped space. */
 236
 237         p = &buf[++(*pos)];
 238
 239         assert(*pos > 0);
 240
 241         /* LINTED */
 242         while (buf[*pos]) {
 243                 if (' ' == buf[*pos])
 244                         if ('\\' != buf[*pos - 1])
 245                                 break;
 246                 (*pos)++;
 247         }
 248
 249         /* XXX - save zeroed byte, if not an argument. */
 250
 251         sv = '\0';
 252         if (buf[*pos]) {
 253                 sv = buf[*pos];
 254                 buf[(*pos)++] = '\0';
 255         }
 256
 257         (void)memset(&tmp, 0, sizeof(struct mdoc_argv));
 258         tmp.line = line;
 259         tmp.pos = *pos;
 260
 261         /* See if our token accepts the argument. */
 262
 263         if (MDOC_ARG_MAX == (tmp.arg = argv_a2arg(tok, p))) {
 264                 /* XXX - restore saved zeroed byte. */
 265                 if (sv)
 266                         buf[*pos - 1] = sv;
 267                 return(ARGV_WORD);
 268         }
 269
 270         while (buf[*pos] && ' ' == buf[*pos])
 271                 (*pos)++;
 272
 273         if ( ! argv(m, line, &tmp, pos, buf))
 274                 return(ARGV_ERROR);
 275
 276         if (NULL == (arg = *v))
 277                 arg = *v = mandoc_calloc(1, sizeof(struct mdoc_arg));
 278
 279         arg->argc++;
 280         arg->argv = mandoc_realloc
 281                 (arg->argv, arg->argc * sizeof(struct mdoc_argv));
 282
 283         (void)memcpy(&arg->argv[(int)arg->argc - 1],
 284                         &tmp, sizeof(struct mdoc_argv));
 285
 286         return(ARGV_ARG);
 287 }
 288
 289
 290 void
 291 mdoc_argv_free(struct mdoc_arg *p)
 292 {
 293         int              i;
 294
 295         if (NULL == p)
 296                 return;
 297
 298         if (p->refcnt) {
 299                 --(p->refcnt);
 300                 if (p->refcnt)
 301                         return;
 302         }
 303         assert(p->argc);
 304
 305         for (i = (int)p->argc - 1; i >= 0; i--)
 306                 mdoc_argn_free(p, i);
 307
 308         free(p->argv);
 309         free(p);
 310 }
 311
 312
 313 void
 314 mdoc_argn_free(struct mdoc_arg *p, int iarg)
 315 {
 316         struct mdoc_argv *arg = &p->argv[iarg];
 317         int               j;
 318
 319         if (arg->sz && arg->value) {
 320                 for (j = (int)arg->sz - 1; j >= 0; j--)
 321                         free(arg->value[j]);
 322                 free(arg->value);
 323         }
 324
 325         for (--p->argc; iarg < (int)p->argc; iarg++)
 326                 p->argv[iarg] = p->argv[iarg+1];
 327 }
 328
 329
 330 enum margserr
 331 mdoc_zargs(struct mdoc *m, int line, int *pos,
 332                 char *buf, int flags, char **v)
 333 {
 334
 335         return(args(m, line, pos, buf, flags, v));
 336 }
 337
 338
 339 enum margserr
 340 mdoc_args(struct mdoc *m, int line, int *pos,
 341                 char *buf, enum mdoct tok, char **v)
 342 {
 343         int               fl;
 344         struct mdoc_node *n;
 345
 346         fl = mdoc_argflags[tok];
 347
 348         if (MDOC_It != tok)
 349                 return(args(m, line, pos, buf, fl, v));
 350
 351         /*
 352          * We know that we're in an `It', so it's reasonable to expect
 353          * us to be sitting in a `Bl'.  Someday this may not be the case
 354          * (if we allow random `It's sitting out there), so provide a
 355          * safe fall-back into the default behaviour.
 356          */
 357
 358         for (n = m->last; n; n = n->parent)
 359                 if (MDOC_Bl == n->tok)
 360                         break;
 361
 362         if (n && LIST_column == n->data.list) {
 363                 fl |= ARGS_TABSEP;
 364                 fl &= ~ARGS_DELIM;
 365         }
 366
 367         return(args(m, line, pos, buf, fl, v));
 368 }
 369
 370
 371 static enum margserr
 372 args(struct mdoc *m, int line, int *pos,
 373                 char *buf, int fl, char **v)
 374 {
 375         int              i;
 376         char            *p, *pp;
 377         enum margserr    rc;
 378         enum mdelim      d;
 379
 380         /*
 381          * Parse out the terms (like `val' in `.Xx -arg val' or simply
 382          * `.Xx val'), which can have all sorts of properties:
 383          *
 384          *   ARGS_DELIM: use special handling if encountering trailing
 385          *   delimiters in the form of [[::delim::][ ]+]+.
 386          *
 387          *   ARGS_NOWARN: don't post warnings.  This is only used when
 388          *   re-parsing delimiters, as the warnings have already been
 389          *   posted.
 390          *
 391          *   ARGS_TABSEP: use special handling for tab/`Ta' separated
 392          *   phrases like in `Bl -column'.
 393          */
 394
 395         assert(' ' != buf[*pos]);
 396
 397         if ('\0' == buf[*pos]) {
 398                 if (MDOC_PPHRASE & m->flags)
 399                         return(ARGS_EOLN);
 400                 /*
 401                  * If we're not in a partial phrase and the flag for
 402                  * being a phrase literal is still set, the punctuation
 403                  * is unterminated.
 404                  */
 405                 if (MDOC_PHRASELIT & m->flags)
 406                         if ( ! mdoc_pmsg(m, line, *pos, MANDOCERR_BADQUOTE))
 407                                 return(ARGS_ERROR);
 408
 409                 m->flags &= ~MDOC_PHRASELIT;
 410                 return(ARGS_EOLN);
 411         }
 412
 413         /*
 414          * If the first character is a closing delimiter and we're to
 415          * look for delimited strings, then pass down the buffer seeing
 416          * if it follows the pattern of [[::delim::][ ]+]+.  Note that
 417          * we ONLY care about closing delimiters.
 418          */
 419
 420         if ((fl & ARGS_DELIM) && DELIM_CLOSE == mdoc_iscdelim(buf[*pos])) {
 421                 for (i = *pos; buf[i]; ) {
 422                         d = mdoc_iscdelim(buf[i]);
 423                         if (DELIM_NONE == d || DELIM_OPEN == d)
 424                                 break;
 425                         i++;
 426                         if ('\0' == buf[i] || ' ' != buf[i])
 427                                 break;
 428                         i++;
 429                         while (buf[i] && ' ' == buf[i])
 430                                 i++;
 431                 }
 432
 433                 if ('\0' == buf[i]) {
 434                         *v = &buf[*pos];
 435                         if (i && ' ' != buf[i - 1])
 436                                 return(ARGS_PUNCT);
 437                         if (ARGS_NOWARN & fl)
 438                                 return(ARGS_PUNCT);
 439                         if ( ! mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE))
 440                                 return(ARGS_ERROR);
 441                         return(ARGS_PUNCT);
 442                 }
 443         }
 444
 445         *v = &buf[*pos];
 446
 447         /*
 448          * First handle TABSEP items, restricted to `Bl -column'.  This
 449          * ignores conventional token parsing and instead uses tabs or
 450          * `Ta' macros to separate phrases.  Phrases are parsed again
 451          * for arguments at a later phase.
 452          */
 453
 454         if (ARGS_TABSEP & fl) {
 455                 /* Scan ahead to tab (can't be escaped). */
 456                 p = strchr(*v, '\t');
 457                 pp = NULL;
 458
 459                 /* Scan ahead to unescaped `Ta'. */
 460                 if ( ! (MDOC_PHRASELIT & m->flags))
 461                         for (pp = *v; ; pp++) {
 462                                 if (NULL == (pp = strstr(pp, "Ta")))
 463                                         break;
 464                                 if (pp > *v && ' ' != *(pp - 1))
 465                                         continue;
 466                                 if (' ' == *(pp + 2) || '\0' == *(pp + 2))
 467                                         break;
 468                         }
 469
 470                 /* By default, assume a phrase. */
 471                 rc = ARGS_PHRASE;
 472
 473                 /*
 474                  * Adjust new-buffer position to be beyond delimiter
 475                  * mark (e.g., Ta -> end + 2).
 476                  */
 477                 if (p && pp) {
 478                         *pos += pp < p ? 2 : 1;
 479                         rc = pp < p ? ARGS_PHRASE : ARGS_PPHRASE;
 480                         p = pp < p ? pp : p;
 481                 } else if (p && ! pp) {
 482                         rc = ARGS_PPHRASE;
 483                         *pos += 1;
 484                 } else if (pp && ! p) {
 485                         p = pp;
 486                         *pos += 2;
 487                 } else {
 488                         rc = ARGS_PEND;
 489                         p = strchr(*v, 0);
 490                 }
 491
 492                 /* Whitespace check for eoln case... */
 493                 if ('\0' == *p && ' ' == *(p - 1) && ! (ARGS_NOWARN & fl))
 494                         if ( ! mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE))
 495                                 return(ARGS_ERROR);
 496
 497                 *pos += (int)(p - *v);
 498
 499                 /* Strip delimiter's preceding whitespace. */
 500                 pp = p - 1;
 501                 while (pp > *v && ' ' == *pp) {
 502                         if (pp > *v && '\\' == *(pp - 1))
 503                                 break;
 504                         pp--;
 505                 }
 506                 *(pp + 1) = 0;
 507
 508                 /* Strip delimiter's proceeding whitespace. */
 509                 for (pp = &buf[*pos]; ' ' == *pp; pp++, (*pos)++)
 510                         /* Skip ahead. */ ;
 511
 512                 return(rc);
 513         }
 514
 515         /*
 516          * Process a quoted literal.  A quote begins with a double-quote
 517          * and ends with a double-quote NOT preceded by a double-quote.
 518          * Whitespace is NOT involved in literal termination.
 519          */
 520
 521         if (MDOC_PHRASELIT & m->flags || '\"' == buf[*pos]) {
 522                 if ( ! (MDOC_PHRASELIT & m->flags))
 523                         *v = &buf[++(*pos)];
 524
 525                 if (MDOC_PPHRASE & m->flags)
 526                         m->flags |= MDOC_PHRASELIT;
 527
 528                 for ( ; buf[*pos]; (*pos)++) {
 529                         if ('\"' != buf[*pos])
 530                                 continue;
 531                         if ('\"' != buf[*pos + 1])
 532                                 break;
 533                         (*pos)++;
 534                 }
 535
 536                 if ('\0' == buf[*pos]) {
 537                         if (ARGS_NOWARN & fl || MDOC_PPHRASE & m->flags)
 538                                 return(ARGS_QWORD);
 539                         if ( ! mdoc_pmsg(m, line, *pos, MANDOCERR_BADQUOTE))
 540                                 return(ARGS_ERROR);
 541                         return(ARGS_QWORD);
 542                 }
 543
 544                 m->flags &= ~MDOC_PHRASELIT;
 545                 buf[(*pos)++] = '\0';
 546
 547                 if ('\0' == buf[*pos])
 548                         return(ARGS_QWORD);
 549
 550                 while (' ' == buf[*pos])
 551                         (*pos)++;
 552
 553                 if (0 == buf[*pos] && ! (ARGS_NOWARN & fl))
 554                         if ( ! mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE))
 555                                 return(ARGS_ERROR);
 556
 557                 return(ARGS_QWORD);
 558         }
 559
 560         /*
 561          * A non-quoted term progresses until either the end of line or
 562          * a non-escaped whitespace.
 563          */
 564
 565         for ( ; buf[*pos]; (*pos)++)
 566                 if (*pos && ' ' == buf[*pos] && '\\' != buf[*pos - 1])
 567                         break;
 568
 569         if ('\0' == buf[*pos])
 570                 return(ARGS_WORD);
 571
 572         buf[(*pos)++] = '\0';
 573
 574         while (' ' == buf[*pos])
 575                 (*pos)++;
 576
 577         if ('\0' == buf[*pos] && ! (ARGS_NOWARN & fl))
 578                 if ( ! mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE))
 579                         return(ARGS_ERROR);
 580
 581         return(ARGS_WORD);
 582 }
 583
 584
 585 static int
 586 argv_a2arg(enum mdoct tok, const char *p)
 587 {
 588
 589         /*
 590          * Parse an argument identifier from its text.  XXX - this
 591          * should really be table-driven to clarify the code.
 592          *
 593          * If you add an argument to the list, make sure that you
 594          * register it here with its one or more macros!
 595          */
 596
 597         switch (tok) {
 598         case (MDOC_An):
 599                 if (0 == strcmp(p, "split"))
 600                         return(MDOC_Split);
 601                 else if (0 == strcmp(p, "nosplit"))
 602                         return(MDOC_Nosplit);
 603                 break;
 604
 605         case (MDOC_Bd):
 606                 if (0 == strcmp(p, "ragged"))
 607                         return(MDOC_Ragged);
 608                 else if (0 == strcmp(p, "unfilled"))
 609                         return(MDOC_Unfilled);
 610                 else if (0 == strcmp(p, "filled"))
 611                         return(MDOC_Filled);
 612                 else if (0 == strcmp(p, "literal"))
 613                         return(MDOC_Literal);
 614                 else if (0 == strcmp(p, "file"))
 615                         return(MDOC_File);
 616                 else if (0 == strcmp(p, "offset"))
 617                         return(MDOC_Offset);
 618                 else if (0 == strcmp(p, "compact"))
 619                         return(MDOC_Compact);
 620                 else if (0 == strcmp(p, "centered"))
 621                         return(MDOC_Centred);
 622                 break;
 623
 624         case (MDOC_Bf):
 625                 if (0 == strcmp(p, "emphasis"))
 626                         return(MDOC_Emphasis);
 627                 else if (0 == strcmp(p, "literal"))
 628                         return(MDOC_Literal);
 629                 else if (0 == strcmp(p, "symbolic"))
 630                         return(MDOC_Symbolic);
 631                 break;
 632
 633         case (MDOC_Bk):
 634                 if (0 == strcmp(p, "words"))
 635                         return(MDOC_Words);
 636                 break;
 637
 638         case (MDOC_Bl):
 639                 if (0 == strcmp(p, "bullet"))
 640                         return(MDOC_Bullet);
 641                 else if (0 == strcmp(p, "dash"))
 642                         return(MDOC_Dash);
 643                 else if (0 == strcmp(p, "hyphen"))
 644                         return(MDOC_Hyphen);
 645                 else if (0 == strcmp(p, "item"))
 646                         return(MDOC_Item);
 647                 else if (0 == strcmp(p, "enum"))
 648                         return(MDOC_Enum);
 649                 else if (0 == strcmp(p, "tag"))
 650                         return(MDOC_Tag);
 651                 else if (0 == strcmp(p, "diag"))
 652                         return(MDOC_Diag);
 653                 else if (0 == strcmp(p, "hang"))
 654                         return(MDOC_Hang);
 655                 else if (0 == strcmp(p, "ohang"))
 656                         return(MDOC_Ohang);
 657                 else if (0 == strcmp(p, "inset"))
 658                         return(MDOC_Inset);
 659                 else if (0 == strcmp(p, "column"))
 660                         return(MDOC_Column);
 661                 else if (0 == strcmp(p, "width"))
 662                         return(MDOC_Width);
 663                 else if (0 == strcmp(p, "offset"))
 664                         return(MDOC_Offset);
 665                 else if (0 == strcmp(p, "compact"))
 666                         return(MDOC_Compact);
 667                 else if (0 == strcmp(p, "nested"))
 668                         return(MDOC_Nested);
 669                 break;
 670
 671         case (MDOC_Rv):
 672                 /* FALLTHROUGH */
 673         case (MDOC_Ex):
 674                 if (0 == strcmp(p, "std"))
 675                         return(MDOC_Std);
 676                 break;
 677         default:
 678                 break;
 679         }
 680
 681         return(MDOC_ARG_MAX);
 682 }
 683
 684
 685 static int
 686 argv_multi(struct mdoc *m, int line,
 687                 struct mdoc_argv *v, int *pos, char *buf)
 688 {
 689         enum margserr    ac;
 690         char            *p;
 691
 692         for (v->sz = 0; ; v->sz++) {
 693                 if ('-' == buf[*pos])
 694                         break;
 695                 ac = args(m, line, pos, buf, 0, &p);
 696                 if (ARGS_ERROR == ac)
 697                         return(0);
 698                 else if (ARGS_EOLN == ac)
 699                         break;
 700
 701                 if (0 == v->sz % MULTI_STEP)
 702                         v->value = mandoc_realloc(v->value,
 703                                 (v->sz + MULTI_STEP) * sizeof(char *));
 704
 705                 v->value[(int)v->sz] = mandoc_strdup(p);
 706         }
 707
 708         return(1);
 709 }
 710
 711
 712 static int
 713 argv_opt_single(struct mdoc *m, int line,
 714                 struct mdoc_argv *v, int *pos, char *buf)
 715 {
 716         enum margserr    ac;
 717         char            *p;
 718
 719         if ('-' == buf[*pos])
 720                 return(1);
 721
 722         ac = args(m, line, pos, buf, 0, &p);
 723         if (ARGS_ERROR == ac)
 724                 return(0);
 725         if (ARGS_EOLN == ac)
 726                 return(1);
 727
 728         v->sz = 1;
 729         v->value = mandoc_malloc(sizeof(char *));
 730         v->value[0] = mandoc_strdup(p);
 731
 732         return(1);
 733 }
 734
 735
 736 /*
 737  * Parse a single, mandatory value from the stream.
 738  */
 739 static int
 740 argv_single(struct mdoc *m, int line,
 741                 struct mdoc_argv *v, int *pos, char *buf)
 742 {
 743         int              ppos;
 744         enum margserr    ac;
 745         char            *p;
 746
 747         ppos = *pos;
 748
 749         ac = args(m, line, pos, buf, 0, &p);
 750         if (ARGS_EOLN == ac) {
 751                 mdoc_pmsg(m, line, ppos, MANDOCERR_SYNTARGVCOUNT);
 752                 return(0);
 753         } else if (ARGS_ERROR == ac)
 754                 return(0);
 755
 756         v->sz = 1;
 757         v->value = mandoc_malloc(sizeof(char *));
 758         v->value[0] = mandoc_strdup(p);
 759
 760         return(1);
 761 }
 762
 763
 764 /*
 765  * Determine rules for parsing arguments.  Arguments can either accept
 766  * no parameters, an optional single parameter, one parameter, or
 767  * multiple parameters.
 768  */
 769 static int
 770 argv(struct mdoc *mdoc, int line,
 771                 struct mdoc_argv *v, int *pos, char *buf)
 772 {
 773
 774         v->sz = 0;
 775         v->value = NULL;
 776
 777         switch (mdoc_argvflags[v->arg]) {
 778         case (ARGV_SINGLE):
 779                 return(argv_single(mdoc, line, v, pos, buf));
 780         case (ARGV_MULTI):
 781                 return(argv_multi(mdoc, line, v, pos, buf));
 782         case (ARGV_OPT_SINGLE):
 783                 return(argv_opt_single(mdoc, line, v, pos, buf));
 784         default:
 785                 /* ARGV_NONE */
 786                 break;
 787         }
 788
 789         return(1);
 790 }