mdoc_argv.c

   1 /*      $Id: mdoc_argv.c,v 1.48 2010/05/15 08:54:04 schwarze 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 "libmdoc.h"
  30 #include "libmandoc.h"
  31
  32 /*
  33  * Routines to parse arguments of macros.  Arguments follow the syntax
  34  * of `-arg [val [valN...]]'.  Arguments come in all types:  quoted
  35  * arguments, multiple arguments per value, no-value arguments, etc.
  36  *
  37  * There's no limit to the number or arguments that may be allocated.
  38  */
  39
  40 #define ARGV_NONE       (1 << 0)
  41 #define ARGV_SINGLE     (1 << 1)
  42 #define ARGV_MULTI      (1 << 2)
  43 #define ARGV_OPT_SINGLE (1 << 3)
  44
  45 #define MULTI_STEP       5
  46
  47 static  int              argv_a2arg(enum mdoct, const char *);
  48 static  enum margserr    args(struct mdoc *, int, int *,
  49                                 char *, int, char **);
  50 static  int              argv(struct mdoc *, int,
  51                                 struct mdoc_argv *, int *, char *);
  52 static  int              argv_single(struct mdoc *, int,
  53                                 struct mdoc_argv *, int *, char *);
  54 static  int              argv_opt_single(struct mdoc *, int,
  55                                 struct mdoc_argv *, int *, char *);
  56 static  int              argv_multi(struct mdoc *, int,
  57                                 struct mdoc_argv *, int *, char *);
  58
  59 /* Per-argument flags. */
  60
  61 static  int mdoc_argvflags[MDOC_ARG_MAX] = {
  62         ARGV_NONE,      /* MDOC_Split */
  63         ARGV_NONE,      /* MDOC_Nosplit */
  64         ARGV_NONE,      /* MDOC_Ragged */
  65         ARGV_NONE,      /* MDOC_Unfilled */
  66         ARGV_NONE,      /* MDOC_Literal */
  67         ARGV_SINGLE,    /* MDOC_File */
  68         ARGV_OPT_SINGLE, /* MDOC_Offset */
  69         ARGV_NONE,      /* MDOC_Bullet */
  70         ARGV_NONE,      /* MDOC_Dash */
  71         ARGV_NONE,      /* MDOC_Hyphen */
  72         ARGV_NONE,      /* MDOC_Item */
  73         ARGV_NONE,      /* MDOC_Enum */
  74         ARGV_NONE,      /* MDOC_Tag */
  75         ARGV_NONE,      /* MDOC_Diag */
  76         ARGV_NONE,      /* MDOC_Hang */
  77         ARGV_NONE,      /* MDOC_Ohang */
  78         ARGV_NONE,      /* MDOC_Inset */
  79         ARGV_MULTI,     /* MDOC_Column */
  80         ARGV_SINGLE,    /* MDOC_Width */
  81         ARGV_NONE,      /* MDOC_Compact */
  82         ARGV_NONE,      /* MDOC_Std */
  83         ARGV_NONE,      /* MDOC_Filled */
  84         ARGV_NONE,      /* MDOC_Words */
  85         ARGV_NONE,      /* MDOC_Emphasis */
  86         ARGV_NONE,      /* MDOC_Symbolic */
  87         ARGV_NONE       /* MDOC_Symbolic */
  88 };
  89
  90 static  int mdoc_argflags[MDOC_MAX] = {
  91         0, /* Ap */
  92         0, /* Dd */
  93         0, /* Dt */
  94         0, /* Os */
  95         0, /* Sh */
  96         0, /* Ss */
  97         ARGS_DELIM, /* Pp */
  98         ARGS_DELIM, /* D1 */
  99         ARGS_DELIM, /* Dl */
 100         0, /* Bd */
 101         0, /* Ed */
 102         0, /* Bl */
 103         0, /* El */
 104         0, /* It */
 105         ARGS_DELIM, /* Ad */
 106         ARGS_DELIM, /* An */
 107         ARGS_DELIM, /* Ar */
 108         0, /* Cd */
 109         ARGS_DELIM, /* Cm */
 110         ARGS_DELIM, /* Dv */
 111         ARGS_DELIM, /* Er */
 112         ARGS_DELIM, /* Ev */
 113         0, /* Ex */
 114         ARGS_DELIM, /* Fa */
 115         0, /* Fd */
 116         ARGS_DELIM, /* Fl */
 117         ARGS_DELIM, /* Fn */
 118         ARGS_DELIM, /* Ft */
 119         ARGS_DELIM, /* Ic */
 120         0, /* In */
 121         ARGS_DELIM, /* Li */
 122         0, /* Nd */
 123         ARGS_DELIM, /* Nm */
 124         ARGS_DELIM, /* Op */
 125         0, /* Ot */
 126         ARGS_DELIM, /* Pa */
 127         0, /* Rv */
 128         ARGS_DELIM, /* St */
 129         ARGS_DELIM, /* Va */
 130         ARGS_DELIM, /* Vt */
 131         ARGS_DELIM, /* Xr */
 132         0, /* %A */
 133         0, /* %B */
 134         0, /* %D */
 135         0, /* %I */
 136         0, /* %J */
 137         0, /* %N */
 138         0, /* %O */
 139         0, /* %P */
 140         0, /* %R */
 141         0, /* %T */
 142         0, /* %V */
 143         ARGS_DELIM, /* Ac */
 144         0, /* Ao */
 145         ARGS_DELIM, /* Aq */
 146         ARGS_DELIM, /* At */
 147         ARGS_DELIM, /* Bc */
 148         0, /* Bf */
 149         0, /* Bo */
 150         ARGS_DELIM, /* Bq */
 151         ARGS_DELIM, /* Bsx */
 152         ARGS_DELIM, /* Bx */
 153         0, /* Db */
 154         ARGS_DELIM, /* Dc */
 155         0, /* Do */
 156         ARGS_DELIM, /* Dq */
 157         ARGS_DELIM, /* Ec */
 158         0, /* Ef */
 159         ARGS_DELIM, /* Em */
 160         0, /* Eo */
 161         ARGS_DELIM, /* Fx */
 162         ARGS_DELIM, /* Ms */
 163         ARGS_DELIM, /* No */
 164         ARGS_DELIM, /* Ns */
 165         ARGS_DELIM, /* Nx */
 166         ARGS_DELIM, /* Ox */
 167         ARGS_DELIM, /* Pc */
 168         ARGS_DELIM, /* Pf */
 169         0, /* Po */
 170         ARGS_DELIM, /* Pq */
 171         ARGS_DELIM, /* Qc */
 172         ARGS_DELIM, /* Ql */
 173         0, /* Qo */
 174         ARGS_DELIM, /* Qq */
 175         0, /* Re */
 176         0, /* Rs */
 177         ARGS_DELIM, /* Sc */
 178         0, /* So */
 179         ARGS_DELIM, /* Sq */
 180         0, /* Sm */
 181         ARGS_DELIM, /* Sx */
 182         ARGS_DELIM, /* Sy */
 183         ARGS_DELIM, /* Tn */
 184         ARGS_DELIM, /* Ux */
 185         ARGS_DELIM, /* Xc */
 186         0, /* Xo */
 187         0, /* Fo */
 188         0, /* Fc */
 189         0, /* Oo */
 190         ARGS_DELIM, /* Oc */
 191         0, /* Bk */
 192         0, /* Ek */
 193         0, /* Bt */
 194         0, /* Hf */
 195         0, /* Fr */
 196         0, /* Ud */
 197         0, /* Lb */
 198         ARGS_DELIM, /* Lp */
 199         ARGS_DELIM, /* Lk */
 200         ARGS_DELIM, /* Mt */
 201         ARGS_DELIM, /* Brq */
 202         0, /* Bro */
 203         ARGS_DELIM, /* Brc */
 204         0, /* %C */
 205         0, /* Es */
 206         0, /* En */
 207         0, /* Dx */
 208         0, /* %Q */
 209         0, /* br */
 210         0, /* sp */
 211         0, /* %U */
 212 };
 213
 214
 215 /*
 216  * Parse an argument from line text.  This comes in the form of -key
 217  * [value0...], which may either have a single mandatory value, at least
 218  * one mandatory value, an optional single value, or no value.
 219  */
 220 enum margverr
 221 mdoc_argv(struct mdoc *m, int line, enum mdoct tok,
 222                 struct mdoc_arg **v, int *pos, char *buf)
 223 {
 224         char             *p, sv;
 225         struct mdoc_argv tmp;
 226         struct mdoc_arg  *arg;
 227
 228         if (0 == buf[*pos])
 229                 return(ARGV_EOLN);
 230
 231         assert(' ' != buf[*pos]);
 232
 233         /* Parse through to the first unescaped space. */
 234
 235         p = &buf[++(*pos)];
 236
 237         assert(*pos > 0);
 238
 239         /* LINTED */
 240         while (buf[*pos]) {
 241                 if (' ' == buf[*pos])
 242                         if ('\\' != buf[*pos - 1])
 243                                 break;
 244                 (*pos)++;
 245         }
 246
 247         /* XXX - save zeroed byte, if not an argument. */
 248
 249         sv = 0;
 250         if (buf[*pos]) {
 251                 sv = buf[*pos];
 252                 buf[(*pos)++] = 0;
 253         }
 254
 255         (void)memset(&tmp, 0, sizeof(struct mdoc_argv));
 256         tmp.line = line;
 257         tmp.pos = *pos;
 258
 259         /* See if our token accepts the argument. */
 260
 261         if (MDOC_ARG_MAX == (tmp.arg = argv_a2arg(tok, p))) {
 262                 /* XXX - restore saved zeroed byte. */
 263                 if (sv)
 264                         buf[*pos - 1] = sv;
 265                 return(ARGV_WORD);
 266         }
 267
 268         while (buf[*pos] && ' ' == buf[*pos])
 269                 (*pos)++;
 270
 271         if ( ! argv(m, line, &tmp, pos, buf))
 272                 return(ARGV_ERROR);
 273
 274         if (NULL == (arg = *v))
 275                 arg = *v = mandoc_calloc(1, sizeof(struct mdoc_arg));
 276
 277         arg->argc++;
 278         arg->argv = mandoc_realloc
 279                 (arg->argv, arg->argc * sizeof(struct mdoc_argv));
 280
 281         (void)memcpy(&arg->argv[(int)arg->argc - 1],
 282                         &tmp, sizeof(struct mdoc_argv));
 283
 284         return(ARGV_ARG);
 285 }
 286
 287
 288 void
 289 mdoc_argv_free(struct mdoc_arg *p)
 290 {
 291         int              i;
 292
 293         if (NULL == p)
 294                 return;
 295
 296         if (p->refcnt) {
 297                 --(p->refcnt);
 298                 if (p->refcnt)
 299                         return;
 300         }
 301         assert(p->argc);
 302
 303         for (i = (int)p->argc - 1; i >= 0; i--)
 304                 mdoc_argn_free(p, i);
 305
 306         free(p->argv);
 307         free(p);
 308 }
 309
 310
 311 void
 312 mdoc_argn_free(struct mdoc_arg *p, int iarg)
 313 {
 314         struct mdoc_argv *arg = &p->argv[iarg];
 315         int               j;
 316
 317         if (arg->sz && arg->value) {
 318                 for (j = (int)arg->sz - 1; j >= 0; j--)
 319                         free(arg->value[j]);
 320                 free(arg->value);
 321         }
 322
 323         for (--p->argc; iarg < (int)p->argc; iarg++)
 324                 p->argv[iarg] = p->argv[iarg+1];
 325 }
 326
 327
 328 enum margserr
 329 mdoc_zargs(struct mdoc *m, int line, int *pos,
 330                 char *buf, int flags, char **v)
 331 {
 332
 333         return(args(m, line, pos, buf, flags, v));
 334 }
 335
 336
 337 enum margserr
 338 mdoc_args(struct mdoc *m, int line, int *pos,
 339                 char *buf, enum mdoct tok, char **v)
 340 {
 341         int               fl, c, i;
 342         struct mdoc_node *n;
 343
 344         fl = mdoc_argflags[tok];
 345
 346         if (MDOC_It != tok)
 347                 return(args(m, line, pos, buf, fl, v));
 348
 349         /*
 350          * The `It' macro is a special case, as it acquires parameters from its
 351          * parent `Bl' context, specifically, we're concerned with -column.
 352          */
 353
 354         for (n = m->last; n; n = n->parent)
 355                 if (MDOC_BLOCK == n->type && MDOC_Bl == n->tok)
 356                         break;
 357
 358         assert(n);
 359         c = (int)(n->args ? n->args->argc : 0);
 360         assert(c > 0);
 361
 362         /* LINTED */
 363         for (i = 0; i < c; i++) {
 364                 if (MDOC_Column != n->args->argv[i].arg)
 365                         continue;
 366                 fl |= ARGS_TABSEP;
 367                 fl &= ~ARGS_DELIM;
 368                 break;
 369         }
 370
 371         return(args(m, line, pos, buf, fl, v));
 372 }
 373
 374
 375 static enum margserr
 376 args(struct mdoc *m, int line, int *pos,
 377                 char *buf, int fl, char **v)
 378 {
 379         int               i;
 380         char             *p, *pp;
 381         enum margserr     rc;
 382
 383         /*
 384          * Parse out the terms (like `val' in `.Xx -arg val' or simply
 385          * `.Xx val'), which can have all sorts of properties:
 386          *
 387          *   ARGS_DELIM: use special handling if encountering trailing
 388          *   delimiters in the form of [[::delim::][ ]+]+.
 389          *
 390          *   ARGS_NOWARN: don't post warnings.  This is only used when
 391          *   re-parsing delimiters, as the warnings have already been
 392          *   posted.
 393          *
 394          *   ARGS_TABSEP: use special handling for tab/`Ta' separated
 395          *   phrases like in `Bl -column'.
 396          */
 397
 398         assert(*pos);
 399         assert(' ' != buf[*pos]);
 400
 401         if ('\0' == buf[*pos]) {
 402                 if (MDOC_PPHRASE & m->flags)
 403                         return(ARGS_EOLN);
 404                 /*
 405                  * If we're not in a partial phrase and the flag for
 406                  * being a phrase literal is still set, the punctuation
 407                  * is unterminated.
 408                  */
 409                 if (MDOC_PHRASELIT & m->flags)
 410                         if ( ! mdoc_pwarn(m, line, *pos, EQUOTTERM))
 411                                 return(ARGS_ERROR);
 412
 413                 m->flags &= ~MDOC_PHRASELIT;
 414                 return(ARGS_EOLN);
 415         }
 416
 417         /*
 418          * If the first character is a closing delimiter and we're to
 419          * look for delimited strings, then pass down the buffer seeing
 420          * if it follows the pattern of [[::delim::][ ]+]+.  Note that
 421          * we ONLY care about closing delimiters.
 422          */
 423
 424         if ((fl & ARGS_DELIM) && DELIM_CLOSE == mdoc_iscdelim(buf[*pos])) {
 425                 for (i = *pos; buf[i]; ) {
 426                         enum mdelim d = mdoc_iscdelim(buf[i]);
 427                         if (DELIM_NONE == d || DELIM_OPEN == d)
 428                                 break;
 429                         i++;
 430                         if ('\0' == buf[i] || ' ' != buf[i])
 431                                 break;
 432                         i++;
 433                         while (buf[i] && ' ' == buf[i])
 434                                 i++;
 435                 }
 436
 437                 if ('\0' == buf[i]) {
 438                         *v = &buf[*pos];
 439                         if (' ' != buf[i - 1])
 440                                 return(ARGS_PUNCT);
 441                         if (ARGS_NOWARN & fl)
 442                                 return(ARGS_PUNCT);
 443                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 444                                 return(ARGS_ERROR);
 445                         return(ARGS_PUNCT);
 446                 }
 447         }
 448
 449         *v = &buf[*pos];
 450
 451         /*
 452          * First handle TABSEP items, restricted to `Bl -column'.  This
 453          * ignores conventional token parsing and instead uses tabs or
 454          * `Ta' macros to separate phrases.  Phrases are parsed again
 455          * for arguments at a later phase.
 456          */
 457
 458         if (ARGS_TABSEP & fl) {
 459                 /* Scan ahead to tab (can't be escaped). */
 460                 p = strchr(*v, '\t');
 461                 pp = NULL;
 462
 463                 /* Scan ahead to unescaped `Ta'. */
 464                 if ( ! (MDOC_PHRASELIT & m->flags))
 465                         for (pp = *v; ; pp++) {
 466                                 if (NULL == (pp = strstr(pp, "Ta")))
 467                                         break;
 468                                 if (pp > *v && ' ' != *(pp - 1))
 469                                         continue;
 470                                 if (' ' == *(pp + 2) || 0 == *(pp + 2))
 471                                         break;
 472                         }
 473
 474                 /* By default, assume a phrase. */
 475                 rc = ARGS_PHRASE;
 476
 477                 /*
 478                  * Adjust new-buffer position to be beyond delimiter
 479                  * mark (e.g., Ta -> end + 2).
 480                  */
 481                 if (p && pp) {
 482                         *pos += pp < p ? 2 : 1;
 483                         rc = pp < p ? ARGS_PHRASE : ARGS_PPHRASE;
 484                         p = pp < p ? pp : p;
 485                 } else if (p && ! pp) {
 486                         rc = ARGS_PPHRASE;
 487                         *pos += 1;
 488                 } else if (pp && ! p) {
 489                         p = pp;
 490                         *pos += 2;
 491                 } else {
 492                         rc = ARGS_PEND;
 493                         p = strchr(*v, 0);
 494                 }
 495
 496                 /* Whitespace check for eoln case... */
 497                 if (0 == *p && ' ' == *(p - 1) && ! (ARGS_NOWARN & fl))
 498                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 499                                 return(ARGS_ERROR);
 500
 501                 *pos += (int)(p - *v);
 502
 503                 /* Strip delimiter's preceding whitespace. */
 504                 pp = p - 1;
 505                 while (pp > *v && ' ' == *pp) {
 506                         if (pp > *v && '\\' == *(pp - 1))
 507                                 break;
 508                         pp--;
 509                 }
 510                 *(pp + 1) = 0;
 511
 512                 /* Strip delimiter's proceeding whitespace. */
 513                 for (pp = &buf[*pos]; ' ' == *pp; pp++, (*pos)++)
 514                         /* Skip ahead. */ ;
 515
 516                 return(rc);
 517         }
 518
 519         /*
 520          * Process a quoted literal.  A quote begins with a double-quote
 521          * and ends with a double-quote NOT preceded by a double-quote.
 522          * Whitespace is NOT involved in literal termination.
 523          */
 524
 525         if (MDOC_PHRASELIT & m->flags || '\"' == buf[*pos]) {
 526                 if ( ! (MDOC_PHRASELIT & m->flags))
 527                         *v = &buf[++(*pos)];
 528
 529                 if (MDOC_PPHRASE & m->flags)
 530                         m->flags |= MDOC_PHRASELIT;
 531
 532                 for ( ; buf[*pos]; (*pos)++) {
 533                         if ('\"' != buf[*pos])
 534                                 continue;
 535                         if ('\"' != buf[*pos + 1])
 536                                 break;
 537                         (*pos)++;
 538                 }
 539
 540                 if ('\0' == buf[*pos]) {
 541                         if (ARGS_NOWARN & fl || MDOC_PPHRASE & m->flags)
 542                                 return(ARGS_QWORD);
 543                         if ( ! mdoc_pwarn(m, line, *pos, EQUOTTERM))
 544                                 return(ARGS_ERROR);
 545                         return(ARGS_QWORD);
 546                 }
 547
 548                 m->flags &= ~MDOC_PHRASELIT;
 549                 buf[(*pos)++] = '\0';
 550
 551                 if ('\0' == buf[*pos])
 552                         return(ARGS_QWORD);
 553
 554                 while (' ' == buf[*pos])
 555                         (*pos)++;
 556
 557                 if (0 == buf[*pos] && ! (ARGS_NOWARN & fl))
 558                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 559                                 return(ARGS_ERROR);
 560
 561                 return(ARGS_QWORD);
 562         }
 563
 564         /*
 565          * A non-quoted term progresses until either the end of line or
 566          * a non-escaped whitespace.
 567          */
 568
 569         for ( ; buf[*pos]; (*pos)++)
 570                 if (' ' == buf[*pos] && '\\' != buf[*pos - 1])
 571                         break;
 572
 573         if ('\0' == buf[*pos])
 574                 return(ARGS_WORD);
 575
 576         buf[(*pos)++] = '\0';
 577
 578         while (' ' == buf[*pos])
 579                 (*pos)++;
 580
 581         if ('\0' == buf[*pos] && ! (ARGS_NOWARN & fl))
 582                 if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 583                         return(ARGS_ERROR);
 584
 585         return(ARGS_WORD);
 586 }
 587
 588
 589 static int
 590 argv_a2arg(enum mdoct tok, const char *p)
 591 {
 592
 593         /*
 594          * Parse an argument identifier from its text.  XXX - this
 595          * should really be table-driven to clarify the code.
 596          *
 597          * If you add an argument to the list, make sure that you
 598          * register it here with its one or more macros!
 599          */
 600
 601         switch (tok) {
 602         case (MDOC_An):
 603                 if (0 == strcmp(p, "split"))
 604                         return(MDOC_Split);
 605                 else if (0 == strcmp(p, "nosplit"))
 606                         return(MDOC_Nosplit);
 607                 break;
 608
 609         case (MDOC_Bd):
 610                 if (0 == strcmp(p, "ragged"))
 611                         return(MDOC_Ragged);
 612                 else if (0 == strcmp(p, "unfilled"))
 613                         return(MDOC_Unfilled);
 614                 else if (0 == strcmp(p, "filled"))
 615                         return(MDOC_Filled);
 616                 else if (0 == strcmp(p, "literal"))
 617                         return(MDOC_Literal);
 618                 else if (0 == strcmp(p, "file"))
 619                         return(MDOC_File);
 620                 else if (0 == strcmp(p, "offset"))
 621                         return(MDOC_Offset);
 622                 else if (0 == strcmp(p, "compact"))
 623                         return(MDOC_Compact);
 624                 else if (0 == strcmp(p, "centered"))
 625                         return(MDOC_Centred);
 626                 break;
 627
 628         case (MDOC_Bf):
 629                 if (0 == strcmp(p, "emphasis"))
 630                         return(MDOC_Emphasis);
 631                 else if (0 == strcmp(p, "literal"))
 632                         return(MDOC_Literal);
 633                 else if (0 == strcmp(p, "symbolic"))
 634                         return(MDOC_Symbolic);
 635                 break;
 636
 637         case (MDOC_Bk):
 638                 if (0 == strcmp(p, "words"))
 639                         return(MDOC_Words);
 640                 break;
 641
 642         case (MDOC_Bl):
 643                 if (0 == strcmp(p, "bullet"))
 644                         return(MDOC_Bullet);
 645                 else if (0 == strcmp(p, "dash"))
 646                         return(MDOC_Dash);
 647                 else if (0 == strcmp(p, "hyphen"))
 648                         return(MDOC_Hyphen);
 649                 else if (0 == strcmp(p, "item"))
 650                         return(MDOC_Item);
 651                 else if (0 == strcmp(p, "enum"))
 652                         return(MDOC_Enum);
 653                 else if (0 == strcmp(p, "tag"))
 654                         return(MDOC_Tag);
 655                 else if (0 == strcmp(p, "diag"))
 656                         return(MDOC_Diag);
 657                 else if (0 == strcmp(p, "hang"))
 658                         return(MDOC_Hang);
 659                 else if (0 == strcmp(p, "ohang"))
 660                         return(MDOC_Ohang);
 661                 else if (0 == strcmp(p, "inset"))
 662                         return(MDOC_Inset);
 663                 else if (0 == strcmp(p, "column"))
 664                         return(MDOC_Column);
 665                 else if (0 == strcmp(p, "width"))
 666                         return(MDOC_Width);
 667                 else if (0 == strcmp(p, "offset"))
 668                         return(MDOC_Offset);
 669                 else if (0 == strcmp(p, "compact"))
 670                         return(MDOC_Compact);
 671                 else if (0 == strcmp(p, "nested"))
 672                         return(MDOC_Nested);
 673                 break;
 674
 675         case (MDOC_Rv):
 676                 /* FALLTHROUGH */
 677         case (MDOC_Ex):
 678                 if (0 == strcmp(p, "std"))
 679                         return(MDOC_Std);
 680                 break;
 681         default:
 682                 break;
 683         }
 684
 685         return(MDOC_ARG_MAX);
 686 }
 687
 688
 689 static int
 690 argv_multi(struct mdoc *m, int line,
 691                 struct mdoc_argv *v, int *pos, char *buf)
 692 {
 693         enum margserr    ac;
 694         char            *p;
 695
 696         for (v->sz = 0; ; v->sz++) {
 697                 if ('-' == buf[*pos])
 698                         break;
 699                 ac = args(m, line, pos, buf, 0, &p);
 700                 if (ARGS_ERROR == ac)
 701                         return(0);
 702                 else if (ARGS_EOLN == ac)
 703                         break;
 704
 705                 if (0 == v->sz % MULTI_STEP)
 706                         v->value = mandoc_realloc(v->value,
 707                                 (v->sz + MULTI_STEP) * sizeof(char *));
 708
 709                 v->value[(int)v->sz] = mandoc_strdup(p);
 710         }
 711
 712         return(1);
 713 }
 714
 715
 716 static int
 717 argv_opt_single(struct mdoc *m, int line,
 718                 struct mdoc_argv *v, int *pos, char *buf)
 719 {
 720         enum margserr    ac;
 721         char            *p;
 722
 723         if ('-' == buf[*pos])
 724                 return(1);
 725
 726         ac = args(m, line, pos, buf, 0, &p);
 727         if (ARGS_ERROR == ac)
 728                 return(0);
 729         if (ARGS_EOLN == ac)
 730                 return(1);
 731
 732         v->sz = 1;
 733         v->value = mandoc_malloc(sizeof(char *));
 734         v->value[0] = mandoc_strdup(p);
 735
 736         return(1);
 737 }
 738
 739
 740 /*
 741  * Parse a single, mandatory value from the stream.
 742  */
 743 static int
 744 argv_single(struct mdoc *m, int line,
 745                 struct mdoc_argv *v, int *pos, char *buf)
 746 {
 747         int              ppos;
 748         enum margserr    ac;
 749         char            *p;
 750
 751         ppos = *pos;
 752
 753         ac = args(m, line, pos, buf, 0, &p);
 754         if (ARGS_ERROR == ac)
 755                 return(0);
 756         if (ARGS_EOLN == ac)
 757                 return(mdoc_perr(m, line, ppos, EARGVAL));
 758
 759         v->sz = 1;
 760         v->value = mandoc_malloc(sizeof(char *));
 761         v->value[0] = mandoc_strdup(p);
 762
 763         return(1);
 764 }
 765
 766
 767 /*
 768  * Determine rules for parsing arguments.  Arguments can either accept
 769  * no parameters, an optional single parameter, one parameter, or
 770  * multiple parameters.
 771  */
 772 static int
 773 argv(struct mdoc *mdoc, int line,
 774                 struct mdoc_argv *v, int *pos, char *buf)
 775 {
 776
 777         v->sz = 0;
 778         v->value = NULL;
 779
 780         switch (mdoc_argvflags[v->arg]) {
 781         case (ARGV_SINGLE):
 782                 return(argv_single(mdoc, line, v, pos, buf));
 783         case (ARGV_MULTI):
 784                 return(argv_multi(mdoc, line, v, pos, buf));
 785         case (ARGV_OPT_SINGLE):
 786                 return(argv_opt_single(mdoc, line, v, pos, buf));
 787         default:
 788                 /* ARGV_NONE */
 789                 break;
 790         }
 791
 792         return(1);
 793 }