mdoc_argv.c

   1 /*      $Id: mdoc_argv.c,v 1.33 2010/01/01 17:14:29 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 "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(int, const char *);
  48 static  int              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 int
 221 mdoc_argv(struct mdoc *m, int line, int 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, j;
 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         /* LINTED */
 304         for (i = 0; i < (int)p->argc; i++) {
 305                 if (0 == p->argv[i].sz)
 306                         continue;
 307                 if (NULL == p->argv[i].value)
 308                         continue;
 309
 310                 /* LINTED */
 311                 for (j = 0; j < (int)p->argv[i].sz; j++)
 312                         if (p->argv[i].value[j])
 313                                 free(p->argv[i].value[j]);
 314
 315                 free(p->argv[i].value);
 316         }
 317
 318         free(p->argv);
 319         free(p);
 320 }
 321
 322
 323 int
 324 mdoc_zargs(struct mdoc *m, int line, int *pos,
 325                 char *buf, int flags, char **v)
 326 {
 327
 328         return(args(m, line, pos, buf, flags, v));
 329 }
 330
 331
 332 int
 333 mdoc_args(struct mdoc *m, int line,
 334                 int *pos, char *buf, int tok, char **v)
 335 {
 336         int               fl, c, i;
 337         struct mdoc_node *n;
 338
 339         fl = (0 == tok) ? 0 : mdoc_argflags[tok];
 340
 341         if (MDOC_It != tok)
 342                 return(args(m, line, pos, buf, fl, v));
 343
 344         /*
 345          * The `It' macro is a special case, as it acquires parameters from its
 346          * parent `Bl' context, specifically, we're concerned with -column.
 347          */
 348
 349         for (n = m->last; n; n = n->parent)
 350                 if (MDOC_BLOCK == n->type && MDOC_Bl == n->tok)
 351                         break;
 352
 353         assert(n);
 354         c = (int)(n->args ? n->args->argc : 0);
 355         assert(c > 0);
 356
 357         /* LINTED */
 358         for (i = 0; i < c; i++) {
 359                 if (MDOC_Column != n->args->argv[i].arg)
 360                         continue;
 361                 fl |= ARGS_TABSEP;
 362                 fl &= ~ARGS_DELIM;
 363                 break;
 364         }
 365
 366         return(args(m, line, pos, buf, fl, v));
 367 }
 368
 369
 370 static int
 371 args(struct mdoc *m, int line, int *pos,
 372                 char *buf, int fl, char **v)
 373 {
 374         int               i;
 375         char             *p, *pp;
 376
 377         /*
 378          * Parse out the terms (like `val' in `.Xx -arg val' or simply
 379          * `.Xx val'), which can have all sorts of properties:
 380          *
 381          *   ARGS_DELIM: use special handling if encountering trailing
 382          *   delimiters in the form of [[::delim::][ ]+]+.
 383          *
 384          *   ARGS_NOWARN: don't post warnings.  This is only used when
 385          *   re-parsing delimiters, as the warnings have already been
 386          *   posted.
 387          *
 388          *   ARGS_TABSEP: use special handling for tab/`Ta' separated
 389          *   phrases like in `Bl -column'.
 390          */
 391
 392         assert(*pos);
 393         assert(' ' != buf[*pos]);
 394
 395         if (0 == buf[*pos])
 396                 return(ARGS_EOLN);
 397
 398         /*
 399          * If the first character is a delimiter and we're to look for
 400          * delimited strings, then pass down the buffer seeing if it
 401          * follows the pattern of [[::delim::][ ]+]+.
 402          */
 403
 404         if ((fl & ARGS_DELIM) && mdoc_iscdelim(buf[*pos])) {
 405                 for (i = *pos; buf[i]; ) {
 406                         if ( ! mdoc_iscdelim(buf[i]))
 407                                 break;
 408                         i++;
 409                         if (0 == buf[i] || ' ' != buf[i])
 410                                 break;
 411                         i++;
 412                         while (buf[i] && ' ' == buf[i])
 413                                 i++;
 414                 }
 415
 416                 if (0 == buf[i]) {
 417                         *v = &buf[*pos];
 418                         if (' ' != buf[i - 1])
 419                                 return(ARGS_PUNCT);
 420                         if (ARGS_NOWARN & fl)
 421                                 return(ARGS_PUNCT);
 422                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 423                                 return(ARGS_ERROR);
 424                         return(ARGS_PUNCT);
 425                 }
 426         }
 427
 428         *v = &buf[*pos];
 429
 430         /*
 431          * First handle TABSEP items, restricted to `Bl -column'.  This
 432          * ignores conventional token parsing and instead uses tabs or
 433          * `Ta' macros to separate phrases.  Phrases are parsed again
 434          * for arguments at a later phase.
 435          */
 436
 437         if (ARGS_TABSEP & fl) {
 438                 /* Scan ahead to tab (can't be escaped). */
 439                 p = strchr(*v, '\t');
 440
 441                 /* Scan ahead to unescaped `Ta'. */
 442                 for (pp = *v; ; pp++) {
 443                         if (NULL == (pp = strstr(pp, "Ta")))
 444                                 break;
 445                         if (pp > *v && ' ' != *(pp - 1))
 446                                 continue;
 447                         if (' ' == *(pp + 2) || 0 == *(pp + 2))
 448                                 break;
 449                 }
 450
 451                 /*
 452                  * Adjust new-buffer position to be beyond delimiter
 453                  * mark (e.g., Ta -> end + 2).
 454                  */
 455                 if (p && pp) {
 456                         *pos += pp < p ? 2 : 1;
 457                         p = pp < p ? pp : p;
 458                 } else if (p && ! pp) {
 459                         *pos += 1;
 460                 } else if (pp && ! p) {
 461                         p = pp;
 462                         *pos += 2;
 463                 } else
 464                         p = strchr(*v, 0);
 465
 466                 /* Whitespace check for eoln case... */
 467                 if (0 == *p && ' ' == *(p - 1) && ! (ARGS_NOWARN & fl))
 468                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 469                                 return(ARGS_ERROR);
 470
 471                 *pos += (int)(p - *v);
 472
 473                 /* Strip delimiter's preceding whitespace. */
 474                 pp = p - 1;
 475                 while (pp > *v && ' ' == *pp) {
 476                         if (pp > *v && '\\' == *(pp - 1))
 477                                 break;
 478                         pp--;
 479                 }
 480                 *(pp + 1) = 0;
 481
 482                 /* Strip delimiter's proceeding whitespace. */
 483                 for (pp = &buf[*pos]; ' ' == *pp; pp++, (*pos)++)
 484                         /* Skip ahead. */ ;
 485
 486                 return(ARGS_PHRASE);
 487         }
 488
 489         /*
 490          * Process a quoted literal.  A quote begins with a double-quote
 491          * and ends with a double-quote NOT preceded by a double-quote.
 492          * Whitespace is NOT involved in literal termination.
 493          */
 494
 495         if ('\"' == buf[*pos]) {
 496                 *v = &buf[++(*pos)];
 497
 498                 for ( ; buf[*pos]; (*pos)++) {
 499                         if ('\"' != buf[*pos])
 500                                 continue;
 501                         if ('\"' != buf[*pos + 1])
 502                                 break;
 503                         (*pos)++;
 504                 }
 505
 506                 if (0 == buf[*pos]) {
 507                         if (ARGS_NOWARN & fl)
 508                                 return(ARGS_QWORD);
 509                         if ( ! mdoc_pwarn(m, line, *pos, EQUOTTERM))
 510                                 return(ARGS_ERROR);
 511                         return(ARGS_QWORD);
 512                 }
 513
 514                 buf[(*pos)++] = 0;
 515
 516                 if (0 == buf[*pos])
 517                         return(ARGS_QWORD);
 518
 519                 while (' ' == buf[*pos])
 520                         (*pos)++;
 521
 522                 if (0 == buf[*pos] && ! (ARGS_NOWARN & fl))
 523                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 524                                 return(ARGS_ERROR);
 525
 526                 return(ARGS_QWORD);
 527         }
 528
 529         /*
 530          * A non-quoted term progresses until either the end of line or
 531          * a non-escaped whitespace.
 532          */
 533
 534         for ( ; buf[*pos]; (*pos)++)
 535                 if (' ' == buf[*pos] && '\\' != buf[*pos - 1])
 536                         break;
 537
 538         if (0 == buf[*pos])
 539                 return(ARGS_WORD);
 540
 541         buf[(*pos)++] = 0;
 542
 543         while (' ' == buf[*pos])
 544                 (*pos)++;
 545
 546         if (0 == buf[*pos] && ! (ARGS_NOWARN & fl))
 547                 if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 548                         return(ARGS_ERROR);
 549
 550         return(ARGS_WORD);
 551 }
 552
 553
 554 static int
 555 argv_a2arg(int tok, const char *p)
 556 {
 557
 558         /*
 559          * Parse an argument identifier from its text.  XXX - this
 560          * should really be table-driven to clarify the code.
 561          *
 562          * If you add an argument to the list, make sure that you
 563          * register it here with its one or more macros!
 564          */
 565
 566         switch (tok) {
 567         case (MDOC_An):
 568                 if (0 == strcmp(p, "split"))
 569                         return(MDOC_Split);
 570                 else if (0 == strcmp(p, "nosplit"))
 571                         return(MDOC_Nosplit);
 572                 break;
 573
 574         case (MDOC_Bd):
 575                 if (0 == strcmp(p, "ragged"))
 576                         return(MDOC_Ragged);
 577                 else if (0 == strcmp(p, "unfilled"))
 578                         return(MDOC_Unfilled);
 579                 else if (0 == strcmp(p, "filled"))
 580                         return(MDOC_Filled);
 581                 else if (0 == strcmp(p, "literal"))
 582                         return(MDOC_Literal);
 583                 else if (0 == strcmp(p, "file"))
 584                         return(MDOC_File);
 585                 else if (0 == strcmp(p, "offset"))
 586                         return(MDOC_Offset);
 587                 else if (0 == strcmp(p, "compact"))
 588                         return(MDOC_Compact);
 589                 else if (0 == strcmp(p, "centered"))
 590                         return(MDOC_Centred);
 591                 break;
 592
 593         case (MDOC_Bf):
 594                 if (0 == strcmp(p, "emphasis"))
 595                         return(MDOC_Emphasis);
 596                 else if (0 == strcmp(p, "literal"))
 597                         return(MDOC_Literal);
 598                 else if (0 == strcmp(p, "symbolic"))
 599                         return(MDOC_Symbolic);
 600                 break;
 601
 602         case (MDOC_Bk):
 603                 if (0 == strcmp(p, "words"))
 604                         return(MDOC_Words);
 605                 break;
 606
 607         case (MDOC_Bl):
 608                 if (0 == strcmp(p, "bullet"))
 609                         return(MDOC_Bullet);
 610                 else if (0 == strcmp(p, "dash"))
 611                         return(MDOC_Dash);
 612                 else if (0 == strcmp(p, "hyphen"))
 613                         return(MDOC_Hyphen);
 614                 else if (0 == strcmp(p, "item"))
 615                         return(MDOC_Item);
 616                 else if (0 == strcmp(p, "enum"))
 617                         return(MDOC_Enum);
 618                 else if (0 == strcmp(p, "tag"))
 619                         return(MDOC_Tag);
 620                 else if (0 == strcmp(p, "diag"))
 621                         return(MDOC_Diag);
 622                 else if (0 == strcmp(p, "hang"))
 623                         return(MDOC_Hang);
 624                 else if (0 == strcmp(p, "ohang"))
 625                         return(MDOC_Ohang);
 626                 else if (0 == strcmp(p, "inset"))
 627                         return(MDOC_Inset);
 628                 else if (0 == strcmp(p, "column"))
 629                         return(MDOC_Column);
 630                 else if (0 == strcmp(p, "width"))
 631                         return(MDOC_Width);
 632                 else if (0 == strcmp(p, "offset"))
 633                         return(MDOC_Offset);
 634                 else if (0 == strcmp(p, "compact"))
 635                         return(MDOC_Compact);
 636                 else if (0 == strcmp(p, "nested"))
 637                         return(MDOC_Nested);
 638                 break;
 639
 640         case (MDOC_Rv):
 641                 /* FALLTHROUGH */
 642         case (MDOC_Ex):
 643                 if (0 == strcmp(p, "std"))
 644                         return(MDOC_Std);
 645                 break;
 646         default:
 647                 break;
 648         }
 649
 650         return(MDOC_ARG_MAX);
 651 }
 652
 653
 654 static int
 655 argv_multi(struct mdoc *m, int line,
 656                 struct mdoc_argv *v, int *pos, char *buf)
 657 {
 658         int              c;
 659         char            *p;
 660
 661         for (v->sz = 0; ; v->sz++) {
 662                 if ('-' == buf[*pos])
 663                         break;
 664                 c = args(m, line, pos, buf, 0, &p);
 665                 if (ARGS_ERROR == c)
 666                         return(0);
 667                 else if (ARGS_EOLN == c)
 668                         break;
 669
 670                 if (0 == v->sz % MULTI_STEP)
 671                         v->value = mandoc_realloc(v->value,
 672                                 (v->sz + MULTI_STEP) * sizeof(char *));
 673
 674                 v->value[(int)v->sz] = mandoc_strdup(p);
 675         }
 676
 677         return(1);
 678 }
 679
 680
 681 static int
 682 argv_opt_single(struct mdoc *m, int line,
 683                 struct mdoc_argv *v, int *pos, char *buf)
 684 {
 685         int              c;
 686         char            *p;
 687
 688         if ('-' == buf[*pos])
 689                 return(1);
 690
 691         c = args(m, line, pos, buf, 0, &p);
 692         if (ARGS_ERROR == c)
 693                 return(0);
 694         if (ARGS_EOLN == c)
 695                 return(1);
 696
 697         v->sz = 1;
 698         v->value = mandoc_malloc(sizeof(char *));
 699         v->value[0] = mandoc_strdup(p);
 700
 701         return(1);
 702 }
 703
 704
 705 /*
 706  * Parse a single, mandatory value from the stream.
 707  */
 708 static int
 709 argv_single(struct mdoc *m, int line,
 710                 struct mdoc_argv *v, int *pos, char *buf)
 711 {
 712         int              c, ppos;
 713         char            *p;
 714
 715         ppos = *pos;
 716
 717         c = args(m, line, pos, buf, 0, &p);
 718         if (ARGS_ERROR == c)
 719                 return(0);
 720         if (ARGS_EOLN == c)
 721                 return(mdoc_perr(m, line, ppos, EARGVAL));
 722
 723         v->sz = 1;
 724         v->value = mandoc_malloc(sizeof(char *));
 725         v->value[0] = mandoc_strdup(p);
 726
 727         return(1);
 728 }
 729
 730
 731 /*
 732  * Determine rules for parsing arguments.  Arguments can either accept
 733  * no parameters, an optional single parameter, one parameter, or
 734  * multiple parameters.
 735  */
 736 static int
 737 argv(struct mdoc *mdoc, int line,
 738                 struct mdoc_argv *v, int *pos, char *buf)
 739 {
 740
 741         v->sz = 0;
 742         v->value = NULL;
 743
 744         switch (mdoc_argvflags[v->arg]) {
 745         case (ARGV_SINGLE):
 746                 return(argv_single(mdoc, line, v, pos, buf));
 747         case (ARGV_MULTI):
 748                 return(argv_multi(mdoc, line, v, pos, buf));
 749         case (ARGV_OPT_SINGLE):
 750                 return(argv_opt_single(mdoc, line, v, pos, buf));
 751         default:
 752                 /* ARGV_NONE */
 753                 break;
 754         }
 755
 756         return(1);
 757 }