mdoc_argv.c

   1 /*      $Id: mdoc_argv.c,v 1.72 2011/03/22 14:33:05 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010 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 <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "mdoc.h"
  30 #include "mandoc.h"
  31 #include "libmdoc.h"
  32 #include "libmandoc.h"
  33
  34 #define MULTI_STEP       5 /* pre-allocate argument values */
  35
  36 static  enum mdocargt    argv_a2arg(enum mdoct, const char *);
  37 static  enum margserr    args(struct mdoc *, int, int *,
  38                                 char *, int, char **);
  39 static  int              args_checkpunct(struct mdoc *,
  40                                 const char *, int, int, int);
  41 static  int              argv(struct mdoc *, int,
  42                                 struct mdoc_argv *, int *, char *);
  43 static  int              argv_single(struct mdoc *, int,
  44                                 struct mdoc_argv *, int *, char *);
  45 static  int              argv_opt_single(struct mdoc *, int,
  46                                 struct mdoc_argv *, int *, char *);
  47 static  int              argv_multi(struct mdoc *, int,
  48                                 struct mdoc_argv *, int *, char *);
  49 static  void             argn_free(struct mdoc_arg *, int);
  50
  51 enum    argvflag {
  52         ARGV_NONE, /* no args to flag (e.g., -split) */
  53         ARGV_SINGLE, /* one arg to flag (e.g., -file xxx)  */
  54         ARGV_MULTI, /* multiple args (e.g., -column xxx yyy) */
  55         ARGV_OPT_SINGLE /* optional arg (e.g., -offset [xxx]) */
  56 };
  57
  58 static  const enum argvflag argvflags[MDOC_ARG_MAX] = {
  59         ARGV_NONE,      /* MDOC_Split */
  60         ARGV_NONE,      /* MDOC_Nosplit */
  61         ARGV_NONE,      /* MDOC_Ragged */
  62         ARGV_NONE,      /* MDOC_Unfilled */
  63         ARGV_NONE,      /* MDOC_Literal */
  64         ARGV_SINGLE,    /* MDOC_File */
  65         ARGV_OPT_SINGLE, /* MDOC_Offset */
  66         ARGV_NONE,      /* MDOC_Bullet */
  67         ARGV_NONE,      /* MDOC_Dash */
  68         ARGV_NONE,      /* MDOC_Hyphen */
  69         ARGV_NONE,      /* MDOC_Item */
  70         ARGV_NONE,      /* MDOC_Enum */
  71         ARGV_NONE,      /* MDOC_Tag */
  72         ARGV_NONE,      /* MDOC_Diag */
  73         ARGV_NONE,      /* MDOC_Hang */
  74         ARGV_NONE,      /* MDOC_Ohang */
  75         ARGV_NONE,      /* MDOC_Inset */
  76         ARGV_MULTI,     /* MDOC_Column */
  77         ARGV_SINGLE,    /* MDOC_Width */
  78         ARGV_NONE,      /* MDOC_Compact */
  79         ARGV_NONE,      /* MDOC_Std */
  80         ARGV_NONE,      /* MDOC_Filled */
  81         ARGV_NONE,      /* MDOC_Words */
  82         ARGV_NONE,      /* MDOC_Emphasis */
  83         ARGV_NONE,      /* MDOC_Symbolic */
  84         ARGV_NONE       /* MDOC_Symbolic */
  85 };
  86
  87 static  const int argflags[MDOC_MAX] = {
  88         0, /* Ap */
  89         0, /* Dd */
  90         0, /* Dt */
  91         0, /* Os */
  92         0, /* Sh */
  93         0, /* Ss */
  94         0, /* Pp */
  95         ARGS_DELIM, /* D1 */
  96         ARGS_DELIM, /* Dl */
  97         0, /* Bd */
  98         0, /* Ed */
  99         0, /* Bl */
 100         0, /* El */
 101         0, /* It */
 102         ARGS_DELIM, /* Ad */
 103         ARGS_DELIM, /* An */
 104         ARGS_DELIM, /* Ar */
 105         0, /* Cd */
 106         ARGS_DELIM, /* Cm */
 107         ARGS_DELIM, /* Dv */
 108         ARGS_DELIM, /* Er */
 109         ARGS_DELIM, /* Ev */
 110         0, /* Ex */
 111         ARGS_DELIM, /* Fa */
 112         0, /* Fd */
 113         ARGS_DELIM, /* Fl */
 114         ARGS_DELIM, /* Fn */
 115         ARGS_DELIM, /* Ft */
 116         ARGS_DELIM, /* Ic */
 117         0, /* In */
 118         ARGS_DELIM, /* Li */
 119         0, /* Nd */
 120         ARGS_DELIM, /* Nm */
 121         ARGS_DELIM, /* Op */
 122         0, /* Ot */
 123         ARGS_DELIM, /* Pa */
 124         0, /* Rv */
 125         ARGS_DELIM, /* St */
 126         ARGS_DELIM, /* Va */
 127         ARGS_DELIM, /* Vt */
 128         ARGS_DELIM, /* Xr */
 129         0, /* %A */
 130         0, /* %B */
 131         0, /* %D */
 132         0, /* %I */
 133         0, /* %J */
 134         0, /* %N */
 135         0, /* %O */
 136         0, /* %P */
 137         0, /* %R */
 138         0, /* %T */
 139         0, /* %V */
 140         ARGS_DELIM, /* Ac */
 141         0, /* Ao */
 142         ARGS_DELIM, /* Aq */
 143         ARGS_DELIM, /* At */
 144         ARGS_DELIM, /* Bc */
 145         0, /* Bf */
 146         0, /* Bo */
 147         ARGS_DELIM, /* Bq */
 148         ARGS_DELIM, /* Bsx */
 149         ARGS_DELIM, /* Bx */
 150         0, /* Db */
 151         ARGS_DELIM, /* Dc */
 152         0, /* Do */
 153         ARGS_DELIM, /* Dq */
 154         ARGS_DELIM, /* Ec */
 155         0, /* Ef */
 156         ARGS_DELIM, /* Em */
 157         0, /* Eo */
 158         ARGS_DELIM, /* Fx */
 159         ARGS_DELIM, /* Ms */
 160         ARGS_DELIM, /* No */
 161         ARGS_DELIM, /* Ns */
 162         ARGS_DELIM, /* Nx */
 163         ARGS_DELIM, /* Ox */
 164         ARGS_DELIM, /* Pc */
 165         ARGS_DELIM, /* Pf */
 166         0, /* Po */
 167         ARGS_DELIM, /* Pq */
 168         ARGS_DELIM, /* Qc */
 169         ARGS_DELIM, /* Ql */
 170         0, /* Qo */
 171         ARGS_DELIM, /* Qq */
 172         0, /* Re */
 173         0, /* Rs */
 174         ARGS_DELIM, /* Sc */
 175         0, /* So */
 176         ARGS_DELIM, /* Sq */
 177         0, /* Sm */
 178         ARGS_DELIM, /* Sx */
 179         ARGS_DELIM, /* Sy */
 180         ARGS_DELIM, /* Tn */
 181         ARGS_DELIM, /* Ux */
 182         ARGS_DELIM, /* Xc */
 183         0, /* Xo */
 184         0, /* Fo */
 185         0, /* Fc */
 186         0, /* Oo */
 187         ARGS_DELIM, /* Oc */
 188         0, /* Bk */
 189         0, /* Ek */
 190         0, /* Bt */
 191         0, /* Hf */
 192         0, /* Fr */
 193         0, /* Ud */
 194         0, /* Lb */
 195         0, /* Lp */
 196         ARGS_DELIM, /* Lk */
 197         ARGS_DELIM, /* Mt */
 198         ARGS_DELIM, /* Brq */
 199         0, /* Bro */
 200         ARGS_DELIM, /* Brc */
 201         0, /* %C */
 202         0, /* Es */
 203         0, /* En */
 204         0, /* Dx */
 205         0, /* %Q */
 206         0, /* br */
 207         0, /* sp */
 208         0, /* %U */
 209         0, /* Ta */
 210 };
 211
 212 /*
 213  * Parse an argument from line text.  This comes in the form of -key
 214  * [value0...], which may either have a single mandatory value, at least
 215  * one mandatory value, an optional single value, or no value.
 216  */
 217 enum margverr
 218 mdoc_argv(struct mdoc *m, int line, enum mdoct tok,
 219                 struct mdoc_arg **v, int *pos, char *buf)
 220 {
 221         char             *p, sv;
 222         struct mdoc_argv tmp;
 223         struct mdoc_arg  *arg;
 224
 225         if ('\0' == buf[*pos])
 226                 return(ARGV_EOLN);
 227
 228         assert(' ' != buf[*pos]);
 229
 230         /* Parse through to the first unescaped space. */
 231
 232         p = &buf[++(*pos)];
 233
 234         assert(*pos > 0);
 235
 236         /* LINTED */
 237         while (buf[*pos]) {
 238                 if (' ' == buf[*pos])
 239                         if ('\\' != buf[*pos - 1])
 240                                 break;
 241                 (*pos)++;
 242         }
 243
 244         /* XXX - save zeroed byte, if not an argument. */
 245
 246         sv = '\0';
 247         if (buf[*pos]) {
 248                 sv = buf[*pos];
 249                 buf[(*pos)++] = '\0';
 250         }
 251
 252         memset(&tmp, 0, sizeof(struct mdoc_argv));
 253         tmp.line = line;
 254         tmp.pos = *pos;
 255
 256         /* See if our token accepts the argument. */
 257
 258         if (MDOC_ARG_MAX == (tmp.arg = argv_a2arg(tok, p))) {
 259                 /* XXX - restore saved zeroed byte. */
 260                 if (sv)
 261                         buf[*pos - 1] = sv;
 262                 return(ARGV_WORD);
 263         }
 264
 265         while (buf[*pos] && ' ' == buf[*pos])
 266                 (*pos)++;
 267
 268         if ( ! argv(m, line, &tmp, pos, buf))
 269                 return(ARGV_ERROR);
 270
 271         if (NULL == (arg = *v))
 272                 arg = *v = mandoc_calloc(1, sizeof(struct mdoc_arg));
 273
 274         arg->argc++;
 275         arg->argv = mandoc_realloc
 276                 (arg->argv, arg->argc * sizeof(struct mdoc_argv));
 277
 278         memcpy(&arg->argv[(int)arg->argc - 1],
 279                         &tmp, sizeof(struct mdoc_argv));
 280
 281         return(ARGV_ARG);
 282 }
 283
 284 void
 285 mdoc_argv_free(struct mdoc_arg *p)
 286 {
 287         int              i;
 288
 289         if (NULL == p)
 290                 return;
 291
 292         if (p->refcnt) {
 293                 --(p->refcnt);
 294                 if (p->refcnt)
 295                         return;
 296         }
 297         assert(p->argc);
 298
 299         for (i = (int)p->argc - 1; i >= 0; i--)
 300                 argn_free(p, i);
 301
 302         free(p->argv);
 303         free(p);
 304 }
 305
 306 static void
 307 argn_free(struct mdoc_arg *p, int iarg)
 308 {
 309         struct mdoc_argv *arg;
 310         int               j;
 311
 312         arg = &p->argv[iarg];
 313
 314         if (arg->sz && arg->value) {
 315                 for (j = (int)arg->sz - 1; j >= 0; j--)
 316                         free(arg->value[j]);
 317                 free(arg->value);
 318         }
 319
 320         for (--p->argc; iarg < (int)p->argc; iarg++)
 321                 p->argv[iarg] = p->argv[iarg+1];
 322 }
 323
 324 enum margserr
 325 mdoc_zargs(struct mdoc *m, int line, int *pos,
 326                 char *buf, int flags, char **v)
 327 {
 328
 329         return(args(m, line, pos, buf, flags, v));
 330 }
 331
 332 enum margserr
 333 mdoc_args(struct mdoc *m, int line, int *pos,
 334                 char *buf, enum mdoct tok, char **v)
 335 {
 336         int               fl;
 337         struct mdoc_node *n;
 338
 339         fl = argflags[tok];
 340
 341         if (MDOC_It != tok)
 342                 return(args(m, line, pos, buf, fl, v));
 343
 344         /*
 345          * We know that we're in an `It', so it's reasonable to expect
 346          * us to be sitting in a `Bl'.  Someday this may not be the case
 347          * (if we allow random `It's sitting out there), so provide a
 348          * safe fall-back into the default behaviour.
 349          */
 350
 351         for (n = m->last; n; n = n->parent)
 352                 if (MDOC_Bl == n->tok)
 353                         break;
 354
 355         if (n && LIST_column == n->norm->Bl.type) {
 356                 fl |= ARGS_TABSEP;
 357                 fl &= ~ARGS_DELIM;
 358         }
 359
 360         return(args(m, line, pos, buf, fl, v));
 361 }
 362
 363 static enum margserr
 364 args(struct mdoc *m, int line, int *pos,
 365                 char *buf, int fl, char **v)
 366 {
 367         char            *p, *pp;
 368         enum margserr    rc;
 369
 370         /*
 371          * Parse out the terms (like `val' in `.Xx -arg val' or simply
 372          * `.Xx val'), which can have all sorts of properties:
 373          *
 374          *   ARGS_DELIM: use special handling if encountering trailing
 375          *   delimiters in the form of [[::delim::][ ]+]+.
 376          *
 377          *   ARGS_NOWARN: don't post warnings.  This is only used when
 378          *   re-parsing delimiters, as the warnings have already been
 379          *   posted.
 380          *
 381          *   ARGS_TABSEP: use special handling for tab/`Ta' separated
 382          *   phrases like in `Bl -column'.
 383          */
 384
 385         assert(' ' != buf[*pos]);
 386
 387         if ('\0' == buf[*pos]) {
 388                 if (MDOC_PPHRASE & m->flags)
 389                         return(ARGS_EOLN);
 390                 /*
 391                  * If we're not in a partial phrase and the flag for
 392                  * being a phrase literal is still set, the punctuation
 393                  * is unterminated.
 394                  */
 395                 if (MDOC_PHRASELIT & m->flags)
 396                         mdoc_pmsg(m, line, *pos, MANDOCERR_BADQUOTE);
 397
 398                 m->flags &= ~MDOC_PHRASELIT;
 399                 return(ARGS_EOLN);
 400         }
 401
 402         *v = &buf[*pos];
 403
 404         if (ARGS_DELIM & fl && args_checkpunct(m, buf, *pos, line, fl))
 405                 return(ARGS_PUNCT);
 406
 407         /*
 408          * First handle TABSEP items, restricted to `Bl -column'.  This
 409          * ignores conventional token parsing and instead uses tabs or
 410          * `Ta' macros to separate phrases.  Phrases are parsed again
 411          * for arguments at a later phase.
 412          */
 413
 414         if (ARGS_TABSEP & fl) {
 415                 /* Scan ahead to tab (can't be escaped). */
 416                 p = strchr(*v, '\t');
 417                 pp = NULL;
 418
 419                 /* Scan ahead to unescaped `Ta'. */
 420                 if ( ! (MDOC_PHRASELIT & m->flags))
 421                         for (pp = *v; ; pp++) {
 422                                 if (NULL == (pp = strstr(pp, "Ta")))
 423                                         break;
 424                                 if (pp > *v && ' ' != *(pp - 1))
 425                                         continue;
 426                                 if (' ' == *(pp + 2) || '\0' == *(pp + 2))
 427                                         break;
 428                         }
 429
 430                 /* By default, assume a phrase. */
 431                 rc = ARGS_PHRASE;
 432
 433                 /*
 434                  * Adjust new-buffer position to be beyond delimiter
 435                  * mark (e.g., Ta -> end + 2).
 436                  */
 437                 if (p && pp) {
 438                         *pos += pp < p ? 2 : 1;
 439                         rc = pp < p ? ARGS_PHRASE : ARGS_PPHRASE;
 440                         p = pp < p ? pp : p;
 441                 } else if (p && ! pp) {
 442                         rc = ARGS_PPHRASE;
 443                         *pos += 1;
 444                 } else if (pp && ! p) {
 445                         p = pp;
 446                         *pos += 2;
 447                 } else {
 448                         rc = ARGS_PEND;
 449                         p = strchr(*v, 0);
 450                 }
 451
 452                 /* Whitespace check for eoln case... */
 453                 if ('\0' == *p && ' ' == *(p - 1) && ! (ARGS_NOWARN & fl))
 454                         mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE);
 455
 456                 *pos += (int)(p - *v);
 457
 458                 /* Strip delimiter's preceding whitespace. */
 459                 pp = p - 1;
 460                 while (pp > *v && ' ' == *pp) {
 461                         if (pp > *v && '\\' == *(pp - 1))
 462                                 break;
 463                         pp--;
 464                 }
 465                 *(pp + 1) = 0;
 466
 467                 /* Strip delimiter's proceeding whitespace. */
 468                 for (pp = &buf[*pos]; ' ' == *pp; pp++, (*pos)++)
 469                         /* Skip ahead. */ ;
 470
 471                 return(rc);
 472         }
 473
 474         /*
 475          * Process a quoted literal.  A quote begins with a double-quote
 476          * and ends with a double-quote NOT preceded by a double-quote.
 477          * Whitespace is NOT involved in literal termination.
 478          */
 479
 480         if (MDOC_PHRASELIT & m->flags || '\"' == buf[*pos]) {
 481                 if ( ! (MDOC_PHRASELIT & m->flags))
 482                         *v = &buf[++(*pos)];
 483
 484                 if (MDOC_PPHRASE & m->flags)
 485                         m->flags |= MDOC_PHRASELIT;
 486
 487                 for ( ; buf[*pos]; (*pos)++) {
 488                         if ('\"' != buf[*pos])
 489                                 continue;
 490                         if ('\"' != buf[*pos + 1])
 491                                 break;
 492                         (*pos)++;
 493                 }
 494
 495                 if ('\0' == buf[*pos]) {
 496                         if (ARGS_NOWARN & fl || MDOC_PPHRASE & m->flags)
 497                                 return(ARGS_QWORD);
 498                         mdoc_pmsg(m, line, *pos, MANDOCERR_BADQUOTE);
 499                         return(ARGS_QWORD);
 500                 }
 501
 502                 m->flags &= ~MDOC_PHRASELIT;
 503                 buf[(*pos)++] = '\0';
 504
 505                 if ('\0' == buf[*pos])
 506                         return(ARGS_QWORD);
 507
 508                 while (' ' == buf[*pos])
 509                         (*pos)++;
 510
 511                 if (0 == buf[*pos] && ! (ARGS_NOWARN & fl))
 512                         mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE);
 513
 514                 return(ARGS_QWORD);
 515         }
 516
 517         /*
 518          * A non-quoted term progresses until either the end of line or
 519          * a non-escaped whitespace.
 520          */
 521
 522         for ( ; buf[*pos]; (*pos)++)
 523                 if (*pos && ' ' == buf[*pos] && '\\' != buf[*pos - 1])
 524                         break;
 525
 526         if ('\0' == buf[*pos])
 527                 return(ARGS_WORD);
 528
 529         buf[(*pos)++] = '\0';
 530
 531         while (' ' == buf[*pos])
 532                 (*pos)++;
 533
 534         if ('\0' == buf[*pos] && ! (ARGS_NOWARN & fl))
 535                 mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE);
 536
 537         return(ARGS_WORD);
 538 }
 539
 540 /*
 541  * Check if the string consists only of space-separated closing
 542  * delimiters.  This is a bit of a dance: the first must be a close
 543  * delimiter, but it may be followed by middle delimiters.  Arbitrary
 544  * whitespace may separate these tokens.
 545  */
 546 static int
 547 args_checkpunct(struct mdoc *m, const char *buf, int i, int ln, int fl)
 548 {
 549         int              j;
 550         char             dbuf[DELIMSZ];
 551         enum mdelim      d;
 552
 553         /* First token must be a close-delimiter. */
 554
 555         for (j = 0; buf[i] && ' ' != buf[i] && j < DELIMSZ; j++, i++)
 556                 dbuf[j] = buf[i];
 557
 558         if (DELIMSZ == j)
 559                 return(0);
 560
 561         dbuf[j] = '\0';
 562         if (DELIM_CLOSE != mdoc_isdelim(dbuf))
 563                 return(0);
 564
 565         while (' ' == buf[i])
 566                 i++;
 567
 568         /* Remaining must NOT be open/none. */
 569
 570         while (buf[i]) {
 571                 j = 0;
 572                 while (buf[i] && ' ' != buf[i] && j < DELIMSZ)
 573                         dbuf[j++] = buf[i++];
 574
 575                 if (DELIMSZ == j)
 576                         return(0);
 577
 578                 dbuf[j] = '\0';
 579                 d = mdoc_isdelim(dbuf);
 580                 if (DELIM_NONE == d || DELIM_OPEN == d)
 581                         return(0);
 582
 583                 while (' ' == buf[i])
 584                         i++;
 585         }
 586
 587         if ( ! (ARGS_NOWARN & fl) && i && ' ' == buf[i - 1])
 588                 mdoc_pmsg(m, ln, i - 1, MANDOCERR_EOLNSPACE);
 589
 590         return('\0' == buf[i]);
 591 }
 592
 593 /*
 594  * Match up an argument string (e.g., `-foo bar' having "foo") with the
 595  * correrct identifier.  It must apply to the given macro.  If none was
 596  * found (including bad matches), return MDOC_ARG_MAX.
 597  */
 598 static enum mdocargt
 599 argv_a2arg(enum mdoct tok, const char *p)
 600 {
 601         enum mdocargt    args[MDOC_ARG_MAX];
 602         int              i, len;
 603
 604         len = 0;
 605
 606         switch (tok) {
 607         case (MDOC_An):
 608                 args[len++] = MDOC_Split;
 609                 args[len++] = MDOC_Nosplit;
 610                 break;
 611         case (MDOC_Bd):
 612                 args[len++] = MDOC_Ragged;
 613                 args[len++] = MDOC_Unfilled;
 614                 args[len++] = MDOC_Filled;
 615                 args[len++] = MDOC_Literal;
 616                 args[len++] = MDOC_File;
 617                 args[len++] = MDOC_Offset;
 618                 args[len++] = MDOC_Compact;
 619                 args[len++] = MDOC_Centred;
 620                 break;
 621         case (MDOC_Bf):
 622                 args[len++] = MDOC_Emphasis;
 623                 args[len++] = MDOC_Literal;
 624                 args[len++] = MDOC_Symbolic;
 625                 break;
 626         case (MDOC_Bk):
 627                 args[len++] = MDOC_Words;
 628                 break;
 629         case (MDOC_Bl):
 630                 args[len++] = MDOC_Bullet;
 631                 args[len++] = MDOC_Dash;
 632                 args[len++] = MDOC_Hyphen;
 633                 args[len++] = MDOC_Item;
 634                 args[len++] = MDOC_Enum;
 635                 args[len++] = MDOC_Tag;
 636                 args[len++] = MDOC_Diag;
 637                 args[len++] = MDOC_Hang;
 638                 args[len++] = MDOC_Ohang;
 639                 args[len++] = MDOC_Inset;
 640                 args[len++] = MDOC_Column;
 641                 args[len++] = MDOC_Width;
 642                 args[len++] = MDOC_Offset;
 643                 args[len++] = MDOC_Compact;
 644                 args[len++] = MDOC_Nested;
 645                 break;
 646         case (MDOC_Rv):
 647                 /* FALLTHROUGH */
 648         case (MDOC_Ex):
 649                 args[len++] = MDOC_Std;
 650                 break;
 651         default:
 652                 break;
 653         }
 654
 655         for (i = 0; i < len; i++)
 656                 if (0 == strcmp(p, mdoc_argnames[args[i]]))
 657                         return(args[i]);
 658
 659         return(MDOC_ARG_MAX);
 660 }
 661
 662 static int
 663 argv_multi(struct mdoc *m, int line,
 664                 struct mdoc_argv *v, int *pos, char *buf)
 665 {
 666         enum margserr    ac;
 667         char            *p;
 668
 669         for (v->sz = 0; ; v->sz++) {
 670                 if ('-' == buf[*pos])
 671                         break;
 672                 ac = args(m, line, pos, buf, 0, &p);
 673                 if (ARGS_ERROR == ac)
 674                         return(0);
 675                 else if (ARGS_EOLN == ac)
 676                         break;
 677
 678                 if (0 == v->sz % MULTI_STEP)
 679                         v->value = mandoc_realloc(v->value,
 680                                 (v->sz + MULTI_STEP) * sizeof(char *));
 681
 682                 v->value[(int)v->sz] = mandoc_strdup(p);
 683         }
 684
 685         return(1);
 686 }
 687
 688 static int
 689 argv_opt_single(struct mdoc *m, int line,
 690                 struct mdoc_argv *v, int *pos, char *buf)
 691 {
 692         enum margserr    ac;
 693         char            *p;
 694
 695         if ('-' == buf[*pos])
 696                 return(1);
 697
 698         ac = args(m, line, pos, buf, 0, &p);
 699         if (ARGS_ERROR == ac)
 700                 return(0);
 701         if (ARGS_EOLN == ac)
 702                 return(1);
 703
 704         v->sz = 1;
 705         v->value = mandoc_malloc(sizeof(char *));
 706         v->value[0] = mandoc_strdup(p);
 707
 708         return(1);
 709 }
 710
 711 /*
 712  * Parse a single, mandatory value from the stream.
 713  */
 714 static int
 715 argv_single(struct mdoc *m, int line,
 716                 struct mdoc_argv *v, int *pos, char *buf)
 717 {
 718         int              ppos;
 719         enum margserr    ac;
 720         char            *p;
 721
 722         ppos = *pos;
 723
 724         ac = args(m, line, pos, buf, 0, &p);
 725         if (ARGS_EOLN == ac) {
 726                 mdoc_pmsg(m, line, ppos, MANDOCERR_SYNTARGVCOUNT);
 727                 return(0);
 728         } else if (ARGS_ERROR == ac)
 729                 return(0);
 730
 731         v->sz = 1;
 732         v->value = mandoc_malloc(sizeof(char *));
 733         v->value[0] = mandoc_strdup(p);
 734
 735         return(1);
 736 }
 737
 738 /*
 739  * Determine rules for parsing arguments.  Arguments can either accept
 740  * no parameters, an optional single parameter, one parameter, or
 741  * multiple parameters.
 742  */
 743 static int
 744 argv(struct mdoc *mdoc, int line,
 745                 struct mdoc_argv *v, int *pos, char *buf)
 746 {
 747
 748         v->sz = 0;
 749         v->value = NULL;
 750
 751         switch (argvflags[v->arg]) {
 752         case (ARGV_SINGLE):
 753                 return(argv_single(mdoc, line, v, pos, buf));
 754         case (ARGV_MULTI):
 755                 return(argv_multi(mdoc, line, v, pos, buf));
 756         case (ARGV_OPT_SINGLE):
 757                 return(argv_opt_single(mdoc, line, v, pos, buf));
 758         case (ARGV_NONE):
 759                 break;
 760         default:
 761                 abort();
 762                 /* NOTREACHED */
 763         }
 764
 765         return(1);
 766 }