mdoc_argv.c

   1 /*      $Id: mdoc_argv.c,v 1.69 2011/03/17 11:09:36 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 "mandoc.h"
  30 #include "libmdoc.h"
  31 #include "libmandoc.h"
  32
  33 #define MULTI_STEP       5 /* pre-allocate argument values */
  34
  35 static  enum mdocargt    argv_a2arg(enum mdoct, const char *);
  36 static  enum margserr    args(struct mdoc *, int, int *,
  37                                 char *, int, char **);
  38 static  int              args_checkpunct(struct mdoc *,
  39                                 const char *, int, int, int);
  40 static  int              argv(struct mdoc *, int,
  41                                 struct mdoc_argv *, int *, char *);
  42 static  int              argv_single(struct mdoc *, int,
  43                                 struct mdoc_argv *, int *, char *);
  44 static  int              argv_opt_single(struct mdoc *, int,
  45                                 struct mdoc_argv *, int *, char *);
  46 static  int              argv_multi(struct mdoc *, int,
  47                                 struct mdoc_argv *, int *, char *);
  48
  49 enum    argvflag {
  50         ARGV_NONE, /* no args to flag (e.g., -split) */
  51         ARGV_SINGLE, /* one arg to flag (e.g., -file xxx)  */
  52         ARGV_MULTI, /* multiple args (e.g., -column xxx yyy) */
  53         ARGV_OPT_SINGLE /* optional arg (e.g., -offset [xxx]) */
  54 };
  55
  56 static  const enum argvflag argvflags[MDOC_ARG_MAX] = {
  57         ARGV_NONE,      /* MDOC_Split */
  58         ARGV_NONE,      /* MDOC_Nosplit */
  59         ARGV_NONE,      /* MDOC_Ragged */
  60         ARGV_NONE,      /* MDOC_Unfilled */
  61         ARGV_NONE,      /* MDOC_Literal */
  62         ARGV_SINGLE,    /* MDOC_File */
  63         ARGV_OPT_SINGLE, /* MDOC_Offset */
  64         ARGV_NONE,      /* MDOC_Bullet */
  65         ARGV_NONE,      /* MDOC_Dash */
  66         ARGV_NONE,      /* MDOC_Hyphen */
  67         ARGV_NONE,      /* MDOC_Item */
  68         ARGV_NONE,      /* MDOC_Enum */
  69         ARGV_NONE,      /* MDOC_Tag */
  70         ARGV_NONE,      /* MDOC_Diag */
  71         ARGV_NONE,      /* MDOC_Hang */
  72         ARGV_NONE,      /* MDOC_Ohang */
  73         ARGV_NONE,      /* MDOC_Inset */
  74         ARGV_MULTI,     /* MDOC_Column */
  75         ARGV_SINGLE,    /* MDOC_Width */
  76         ARGV_NONE,      /* MDOC_Compact */
  77         ARGV_NONE,      /* MDOC_Std */
  78         ARGV_NONE,      /* MDOC_Filled */
  79         ARGV_NONE,      /* MDOC_Words */
  80         ARGV_NONE,      /* MDOC_Emphasis */
  81         ARGV_NONE,      /* MDOC_Symbolic */
  82         ARGV_NONE       /* MDOC_Symbolic */
  83 };
  84
  85 static  const int argflags[MDOC_MAX] = {
  86         0, /* Ap */
  87         0, /* Dd */
  88         0, /* Dt */
  89         0, /* Os */
  90         0, /* Sh */
  91         0, /* Ss */
  92         0, /* Pp */
  93         ARGS_DELIM, /* D1 */
  94         ARGS_DELIM, /* Dl */
  95         0, /* Bd */
  96         0, /* Ed */
  97         0, /* Bl */
  98         0, /* El */
  99         0, /* It */
 100         ARGS_DELIM, /* Ad */
 101         ARGS_DELIM, /* An */
 102         ARGS_DELIM, /* Ar */
 103         0, /* Cd */
 104         ARGS_DELIM, /* Cm */
 105         ARGS_DELIM, /* Dv */
 106         ARGS_DELIM, /* Er */
 107         ARGS_DELIM, /* Ev */
 108         0, /* Ex */
 109         ARGS_DELIM, /* Fa */
 110         0, /* Fd */
 111         ARGS_DELIM, /* Fl */
 112         ARGS_DELIM, /* Fn */
 113         ARGS_DELIM, /* Ft */
 114         ARGS_DELIM, /* Ic */
 115         0, /* In */
 116         ARGS_DELIM, /* Li */
 117         0, /* Nd */
 118         ARGS_DELIM, /* Nm */
 119         ARGS_DELIM, /* Op */
 120         0, /* Ot */
 121         ARGS_DELIM, /* Pa */
 122         0, /* Rv */
 123         ARGS_DELIM, /* St */
 124         ARGS_DELIM, /* Va */
 125         ARGS_DELIM, /* Vt */
 126         ARGS_DELIM, /* Xr */
 127         0, /* %A */
 128         0, /* %B */
 129         0, /* %D */
 130         0, /* %I */
 131         0, /* %J */
 132         0, /* %N */
 133         0, /* %O */
 134         0, /* %P */
 135         0, /* %R */
 136         0, /* %T */
 137         0, /* %V */
 138         ARGS_DELIM, /* Ac */
 139         0, /* Ao */
 140         ARGS_DELIM, /* Aq */
 141         ARGS_DELIM, /* At */
 142         ARGS_DELIM, /* Bc */
 143         0, /* Bf */
 144         0, /* Bo */
 145         ARGS_DELIM, /* Bq */
 146         ARGS_DELIM, /* Bsx */
 147         ARGS_DELIM, /* Bx */
 148         0, /* Db */
 149         ARGS_DELIM, /* Dc */
 150         0, /* Do */
 151         ARGS_DELIM, /* Dq */
 152         ARGS_DELIM, /* Ec */
 153         0, /* Ef */
 154         ARGS_DELIM, /* Em */
 155         0, /* Eo */
 156         ARGS_DELIM, /* Fx */
 157         ARGS_DELIM, /* Ms */
 158         ARGS_DELIM, /* No */
 159         ARGS_DELIM, /* Ns */
 160         ARGS_DELIM, /* Nx */
 161         ARGS_DELIM, /* Ox */
 162         ARGS_DELIM, /* Pc */
 163         ARGS_DELIM, /* Pf */
 164         0, /* Po */
 165         ARGS_DELIM, /* Pq */
 166         ARGS_DELIM, /* Qc */
 167         ARGS_DELIM, /* Ql */
 168         0, /* Qo */
 169         ARGS_DELIM, /* Qq */
 170         0, /* Re */
 171         0, /* Rs */
 172         ARGS_DELIM, /* Sc */
 173         0, /* So */
 174         ARGS_DELIM, /* Sq */
 175         0, /* Sm */
 176         ARGS_DELIM, /* Sx */
 177         ARGS_DELIM, /* Sy */
 178         ARGS_DELIM, /* Tn */
 179         ARGS_DELIM, /* Ux */
 180         ARGS_DELIM, /* Xc */
 181         0, /* Xo */
 182         0, /* Fo */
 183         0, /* Fc */
 184         0, /* Oo */
 185         ARGS_DELIM, /* Oc */
 186         0, /* Bk */
 187         0, /* Ek */
 188         0, /* Bt */
 189         0, /* Hf */
 190         0, /* Fr */
 191         0, /* Ud */
 192         0, /* Lb */
 193         0, /* Lp */
 194         ARGS_DELIM, /* Lk */
 195         ARGS_DELIM, /* Mt */
 196         ARGS_DELIM, /* Brq */
 197         0, /* Bro */
 198         ARGS_DELIM, /* Brc */
 199         0, /* %C */
 200         0, /* Es */
 201         0, /* En */
 202         0, /* Dx */
 203         0, /* %Q */
 204         0, /* br */
 205         0, /* sp */
 206         0, /* %U */
 207         0, /* Ta */
 208 };
 209
 210 /*
 211  * Parse an argument from line text.  This comes in the form of -key
 212  * [value0...], which may either have a single mandatory value, at least
 213  * one mandatory value, an optional single value, or no value.
 214  */
 215 enum margverr
 216 mdoc_argv(struct mdoc *m, int line, enum mdoct tok,
 217                 struct mdoc_arg **v, int *pos, char *buf)
 218 {
 219         char             *p, sv;
 220         struct mdoc_argv tmp;
 221         struct mdoc_arg  *arg;
 222
 223         if ('\0' == buf[*pos])
 224                 return(ARGV_EOLN);
 225
 226         assert(' ' != buf[*pos]);
 227
 228         /* Parse through to the first unescaped space. */
 229
 230         p = &buf[++(*pos)];
 231
 232         assert(*pos > 0);
 233
 234         /* LINTED */
 235         while (buf[*pos]) {
 236                 if (' ' == buf[*pos])
 237                         if ('\\' != buf[*pos - 1])
 238                                 break;
 239                 (*pos)++;
 240         }
 241
 242         /* XXX - save zeroed byte, if not an argument. */
 243
 244         sv = '\0';
 245         if (buf[*pos]) {
 246                 sv = buf[*pos];
 247                 buf[(*pos)++] = '\0';
 248         }
 249
 250         memset(&tmp, 0, sizeof(struct mdoc_argv));
 251         tmp.line = line;
 252         tmp.pos = *pos;
 253
 254         /* See if our token accepts the argument. */
 255
 256         if (MDOC_ARG_MAX == (tmp.arg = argv_a2arg(tok, p))) {
 257                 /* XXX - restore saved zeroed byte. */
 258                 if (sv)
 259                         buf[*pos - 1] = sv;
 260                 return(ARGV_WORD);
 261         }
 262
 263         while (buf[*pos] && ' ' == buf[*pos])
 264                 (*pos)++;
 265
 266         if ( ! argv(m, line, &tmp, pos, buf))
 267                 return(ARGV_ERROR);
 268
 269         if (NULL == (arg = *v))
 270                 arg = *v = mandoc_calloc(1, sizeof(struct mdoc_arg));
 271
 272         arg->argc++;
 273         arg->argv = mandoc_realloc
 274                 (arg->argv, arg->argc * sizeof(struct mdoc_argv));
 275
 276         memcpy(&arg->argv[(int)arg->argc - 1],
 277                         &tmp, sizeof(struct mdoc_argv));
 278
 279         return(ARGV_ARG);
 280 }
 281
 282 void
 283 mdoc_argv_free(struct mdoc_arg *p)
 284 {
 285         int              i;
 286
 287         if (NULL == p)
 288                 return;
 289
 290         if (p->refcnt) {
 291                 --(p->refcnt);
 292                 if (p->refcnt)
 293                         return;
 294         }
 295         assert(p->argc);
 296
 297         for (i = (int)p->argc - 1; i >= 0; i--)
 298                 mdoc_argn_free(p, i);
 299
 300         free(p->argv);
 301         free(p);
 302 }
 303
 304 void
 305 mdoc_argn_free(struct mdoc_arg *p, int iarg)
 306 {
 307         struct mdoc_argv *arg;
 308         int               j;
 309
 310         arg = &p->argv[iarg];
 311
 312         if (arg->sz && arg->value) {
 313                 for (j = (int)arg->sz - 1; j >= 0; j--)
 314                         free(arg->value[j]);
 315                 free(arg->value);
 316         }
 317
 318         for (--p->argc; iarg < (int)p->argc; iarg++)
 319                 p->argv[iarg] = p->argv[iarg+1];
 320 }
 321
 322 enum margserr
 323 mdoc_zargs(struct mdoc *m, int line, int *pos,
 324                 char *buf, int flags, char **v)
 325 {
 326
 327         return(args(m, line, pos, buf, flags, v));
 328 }
 329
 330 enum margserr
 331 mdoc_args(struct mdoc *m, int line, int *pos,
 332                 char *buf, enum mdoct tok, char **v)
 333 {
 334         int               fl;
 335         struct mdoc_node *n;
 336
 337         fl = argflags[tok];
 338
 339         if (MDOC_It != tok)
 340                 return(args(m, line, pos, buf, fl, v));
 341
 342         /*
 343          * We know that we're in an `It', so it's reasonable to expect
 344          * us to be sitting in a `Bl'.  Someday this may not be the case
 345          * (if we allow random `It's sitting out there), so provide a
 346          * safe fall-back into the default behaviour.
 347          */
 348
 349         for (n = m->last; n; n = n->parent)
 350                 if (MDOC_Bl == n->tok)
 351                         break;
 352
 353         if (n && LIST_column == n->norm->Bl.type) {
 354                 fl |= ARGS_TABSEP;
 355                 fl &= ~ARGS_DELIM;
 356         }
 357
 358         return(args(m, line, pos, buf, fl, v));
 359 }
 360
 361 static enum margserr
 362 args(struct mdoc *m, int line, int *pos,
 363                 char *buf, int fl, char **v)
 364 {
 365         char            *p, *pp;
 366         enum margserr    rc;
 367
 368         /*
 369          * Parse out the terms (like `val' in `.Xx -arg val' or simply
 370          * `.Xx val'), which can have all sorts of properties:
 371          *
 372          *   ARGS_DELIM: use special handling if encountering trailing
 373          *   delimiters in the form of [[::delim::][ ]+]+.
 374          *
 375          *   ARGS_NOWARN: don't post warnings.  This is only used when
 376          *   re-parsing delimiters, as the warnings have already been
 377          *   posted.
 378          *
 379          *   ARGS_TABSEP: use special handling for tab/`Ta' separated
 380          *   phrases like in `Bl -column'.
 381          */
 382
 383         assert(' ' != buf[*pos]);
 384
 385         if ('\0' == buf[*pos]) {
 386                 if (MDOC_PPHRASE & m->flags)
 387                         return(ARGS_EOLN);
 388                 /*
 389                  * If we're not in a partial phrase and the flag for
 390                  * being a phrase literal is still set, the punctuation
 391                  * is unterminated.
 392                  */
 393                 if (MDOC_PHRASELIT & m->flags)
 394                         mdoc_pmsg(m, line, *pos, MANDOCERR_BADQUOTE);
 395
 396                 m->flags &= ~MDOC_PHRASELIT;
 397                 return(ARGS_EOLN);
 398         }
 399
 400         *v = &buf[*pos];
 401
 402         if (ARGS_DELIM & fl && args_checkpunct(m, buf, *pos, line, fl))
 403                 return(ARGS_PUNCT);
 404
 405         /*
 406          * First handle TABSEP items, restricted to `Bl -column'.  This
 407          * ignores conventional token parsing and instead uses tabs or
 408          * `Ta' macros to separate phrases.  Phrases are parsed again
 409          * for arguments at a later phase.
 410          */
 411
 412         if (ARGS_TABSEP & fl) {
 413                 /* Scan ahead to tab (can't be escaped). */
 414                 p = strchr(*v, '\t');
 415                 pp = NULL;
 416
 417                 /* Scan ahead to unescaped `Ta'. */
 418                 if ( ! (MDOC_PHRASELIT & m->flags))
 419                         for (pp = *v; ; pp++) {
 420                                 if (NULL == (pp = strstr(pp, "Ta")))
 421                                         break;
 422                                 if (pp > *v && ' ' != *(pp - 1))
 423                                         continue;
 424                                 if (' ' == *(pp + 2) || '\0' == *(pp + 2))
 425                                         break;
 426                         }
 427
 428                 /* By default, assume a phrase. */
 429                 rc = ARGS_PHRASE;
 430
 431                 /*
 432                  * Adjust new-buffer position to be beyond delimiter
 433                  * mark (e.g., Ta -> end + 2).
 434                  */
 435                 if (p && pp) {
 436                         *pos += pp < p ? 2 : 1;
 437                         rc = pp < p ? ARGS_PHRASE : ARGS_PPHRASE;
 438                         p = pp < p ? pp : p;
 439                 } else if (p && ! pp) {
 440                         rc = ARGS_PPHRASE;
 441                         *pos += 1;
 442                 } else if (pp && ! p) {
 443                         p = pp;
 444                         *pos += 2;
 445                 } else {
 446                         rc = ARGS_PEND;
 447                         p = strchr(*v, 0);
 448                 }
 449
 450                 /* Whitespace check for eoln case... */
 451                 if ('\0' == *p && ' ' == *(p - 1) && ! (ARGS_NOWARN & fl))
 452                         mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE);
 453
 454                 *pos += (int)(p - *v);
 455
 456                 /* Strip delimiter's preceding whitespace. */
 457                 pp = p - 1;
 458                 while (pp > *v && ' ' == *pp) {
 459                         if (pp > *v && '\\' == *(pp - 1))
 460                                 break;
 461                         pp--;
 462                 }
 463                 *(pp + 1) = 0;
 464
 465                 /* Strip delimiter's proceeding whitespace. */
 466                 for (pp = &buf[*pos]; ' ' == *pp; pp++, (*pos)++)
 467                         /* Skip ahead. */ ;
 468
 469                 return(rc);
 470         }
 471
 472         /*
 473          * Process a quoted literal.  A quote begins with a double-quote
 474          * and ends with a double-quote NOT preceded by a double-quote.
 475          * Whitespace is NOT involved in literal termination.
 476          */
 477
 478         if (MDOC_PHRASELIT & m->flags || '\"' == buf[*pos]) {
 479                 if ( ! (MDOC_PHRASELIT & m->flags))
 480                         *v = &buf[++(*pos)];
 481
 482                 if (MDOC_PPHRASE & m->flags)
 483                         m->flags |= MDOC_PHRASELIT;
 484
 485                 for ( ; buf[*pos]; (*pos)++) {
 486                         if ('\"' != buf[*pos])
 487                                 continue;
 488                         if ('\"' != buf[*pos + 1])
 489                                 break;
 490                         (*pos)++;
 491                 }
 492
 493                 if ('\0' == buf[*pos]) {
 494                         if (ARGS_NOWARN & fl || MDOC_PPHRASE & m->flags)
 495                                 return(ARGS_QWORD);
 496                         mdoc_pmsg(m, line, *pos, MANDOCERR_BADQUOTE);
 497                         return(ARGS_QWORD);
 498                 }
 499
 500                 m->flags &= ~MDOC_PHRASELIT;
 501                 buf[(*pos)++] = '\0';
 502
 503                 if ('\0' == buf[*pos])
 504                         return(ARGS_QWORD);
 505
 506                 while (' ' == buf[*pos])
 507                         (*pos)++;
 508
 509                 if (0 == buf[*pos] && ! (ARGS_NOWARN & fl))
 510                         mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE);
 511
 512                 return(ARGS_QWORD);
 513         }
 514
 515         /*
 516          * A non-quoted term progresses until either the end of line or
 517          * a non-escaped whitespace.
 518          */
 519
 520         for ( ; buf[*pos]; (*pos)++)
 521                 if (*pos && ' ' == buf[*pos] && '\\' != buf[*pos - 1])
 522                         break;
 523
 524         if ('\0' == buf[*pos])
 525                 return(ARGS_WORD);
 526
 527         buf[(*pos)++] = '\0';
 528
 529         while (' ' == buf[*pos])
 530                 (*pos)++;
 531
 532         if ('\0' == buf[*pos] && ! (ARGS_NOWARN & fl))
 533                 mdoc_pmsg(m, line, *pos, MANDOCERR_EOLNSPACE);
 534
 535         return(ARGS_WORD);
 536 }
 537
 538 /*
 539  * Check if the string consists only of space-separated closing
 540  * delimiters.  This is a bit of a dance: the first must be a close
 541  * delimiter, but it may be followed by middle delimiters.  Arbitrary
 542  * whitespace may separate these tokens.
 543  */
 544 static int
 545 args_checkpunct(struct mdoc *m, const char *buf, int i, int ln, int fl)
 546 {
 547         int              j;
 548         char             dbuf[DELIMSZ];
 549         enum mdelim      d;
 550
 551         /* First token must be a close-delimiter. */
 552
 553         for (j = 0; buf[i] && ' ' != buf[i] && j < DELIMSZ; j++, i++)
 554                 dbuf[j] = buf[i];
 555
 556         if (DELIMSZ == j)
 557                 return(0);
 558
 559         dbuf[j] = '\0';
 560         if (DELIM_CLOSE != mandoc_isdelim(dbuf))
 561                 return(0);
 562
 563         while (' ' == buf[i])
 564                 i++;
 565
 566         /* Remaining must NOT be open/none. */
 567
 568         while (buf[i]) {
 569                 j = 0;
 570                 while (buf[i] && ' ' != buf[i] && j < DELIMSZ)
 571                         dbuf[j++] = buf[i++];
 572
 573                 if (DELIMSZ == j)
 574                         return(0);
 575
 576                 dbuf[j] = '\0';
 577                 d = mandoc_isdelim(dbuf);
 578                 if (DELIM_NONE == d || DELIM_OPEN == d)
 579                         return(0);
 580
 581                 while (' ' == buf[i])
 582                         i++;
 583         }
 584
 585         if ( ! (ARGS_NOWARN & fl) && i && ' ' == buf[i - 1])
 586                 mdoc_pmsg(m, ln, i - 1, MANDOCERR_EOLNSPACE);
 587
 588         return('\0' == buf[i]);
 589 }
 590
 591 /*
 592  * Match up an argument string (e.g., `-foo bar' having "foo") with the
 593  * correrct identifier.  It must apply to the given macro.  If none was
 594  * found (including bad matches), return MDOC_ARG_MAX.
 595  */
 596 static enum mdocargt
 597 argv_a2arg(enum mdoct tok, const char *p)
 598 {
 599         enum mdocargt    args[MDOC_ARG_MAX];
 600         int              i, len;
 601
 602         len = 0;
 603
 604         switch (tok) {
 605         case (MDOC_An):
 606                 args[len++] = MDOC_Split;
 607                 args[len++] = MDOC_Nosplit;
 608                 break;
 609         case (MDOC_Bd):
 610                 args[len++] = MDOC_Ragged;
 611                 args[len++] = MDOC_Unfilled;
 612                 args[len++] = MDOC_Filled;
 613                 args[len++] = MDOC_Literal;
 614                 args[len++] = MDOC_File;
 615                 args[len++] = MDOC_Offset;
 616                 args[len++] = MDOC_Compact;
 617                 args[len++] = MDOC_Centred;
 618                 break;
 619         case (MDOC_Bf):
 620                 args[len++] = MDOC_Emphasis;
 621                 args[len++] = MDOC_Literal;
 622                 args[len++] = MDOC_Symbolic;
 623                 break;
 624         case (MDOC_Bk):
 625                 args[len++] = MDOC_Words;
 626                 break;
 627         case (MDOC_Bl):
 628                 args[len++] = MDOC_Bullet;
 629                 args[len++] = MDOC_Dash;
 630                 args[len++] = MDOC_Hyphen;
 631                 args[len++] = MDOC_Item;
 632                 args[len++] = MDOC_Enum;
 633                 args[len++] = MDOC_Tag;
 634                 args[len++] = MDOC_Diag;
 635                 args[len++] = MDOC_Hang;
 636                 args[len++] = MDOC_Ohang;
 637                 args[len++] = MDOC_Inset;
 638                 args[len++] = MDOC_Column;
 639                 args[len++] = MDOC_Width;
 640                 args[len++] = MDOC_Offset;
 641                 args[len++] = MDOC_Compact;
 642                 args[len++] = MDOC_Nested;
 643                 break;
 644         case (MDOC_Rv):
 645                 /* FALLTHROUGH */
 646         case (MDOC_Ex):
 647                 args[len++] = MDOC_Std;
 648                 break;
 649         default:
 650                 break;
 651         }
 652
 653         for (i = 0; i < len; i++)
 654                 if (0 == strcmp(p, mdoc_argnames[args[i]]))
 655                         return(args[i]);
 656
 657         return(MDOC_ARG_MAX);
 658 }
 659
 660 static int
 661 argv_multi(struct mdoc *m, int line,
 662                 struct mdoc_argv *v, int *pos, char *buf)
 663 {
 664         enum margserr    ac;
 665         char            *p;
 666
 667         for (v->sz = 0; ; v->sz++) {
 668                 if ('-' == buf[*pos])
 669                         break;
 670                 ac = args(m, line, pos, buf, 0, &p);
 671                 if (ARGS_ERROR == ac)
 672                         return(0);
 673                 else if (ARGS_EOLN == ac)
 674                         break;
 675
 676                 if (0 == v->sz % MULTI_STEP)
 677                         v->value = mandoc_realloc(v->value,
 678                                 (v->sz + MULTI_STEP) * sizeof(char *));
 679
 680                 v->value[(int)v->sz] = mandoc_strdup(p);
 681         }
 682
 683         return(1);
 684 }
 685
 686 static int
 687 argv_opt_single(struct mdoc *m, int line,
 688                 struct mdoc_argv *v, int *pos, char *buf)
 689 {
 690         enum margserr    ac;
 691         char            *p;
 692
 693         if ('-' == buf[*pos])
 694                 return(1);
 695
 696         ac = args(m, line, pos, buf, 0, &p);
 697         if (ARGS_ERROR == ac)
 698                 return(0);
 699         if (ARGS_EOLN == ac)
 700                 return(1);
 701
 702         v->sz = 1;
 703         v->value = mandoc_malloc(sizeof(char *));
 704         v->value[0] = mandoc_strdup(p);
 705
 706         return(1);
 707 }
 708
 709 /*
 710  * Parse a single, mandatory value from the stream.
 711  */
 712 static int
 713 argv_single(struct mdoc *m, int line,
 714                 struct mdoc_argv *v, int *pos, char *buf)
 715 {
 716         int              ppos;
 717         enum margserr    ac;
 718         char            *p;
 719
 720         ppos = *pos;
 721
 722         ac = args(m, line, pos, buf, 0, &p);
 723         if (ARGS_EOLN == ac) {
 724                 mdoc_pmsg(m, line, ppos, MANDOCERR_SYNTARGVCOUNT);
 725                 return(0);
 726         } else if (ARGS_ERROR == ac)
 727                 return(0);
 728
 729         v->sz = 1;
 730         v->value = mandoc_malloc(sizeof(char *));
 731         v->value[0] = mandoc_strdup(p);
 732
 733         return(1);
 734 }
 735
 736 /*
 737  * Determine rules for parsing arguments.  Arguments can either accept
 738  * no parameters, an optional single parameter, one parameter, or
 739  * multiple parameters.
 740  */
 741 static int
 742 argv(struct mdoc *mdoc, int line,
 743                 struct mdoc_argv *v, int *pos, char *buf)
 744 {
 745
 746         v->sz = 0;
 747         v->value = NULL;
 748
 749         switch (argvflags[v->arg]) {
 750         case (ARGV_SINGLE):
 751                 return(argv_single(mdoc, line, v, pos, buf));
 752         case (ARGV_MULTI):
 753                 return(argv_multi(mdoc, line, v, pos, buf));
 754         case (ARGV_OPT_SINGLE):
 755                 return(argv_opt_single(mdoc, line, v, pos, buf));
 756         case (ARGV_NONE):
 757                 break;
 758         default:
 759                 abort();
 760                 /* NOTREACHED */
 761         }
 762
 763         return(1);
 764 }