mdoc_argv.c

   1 /*      $Id: mdoc_argv.c,v 1.25 2009/08/20 13:22:48 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 #include <sys/types.h>
  18
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "libmdoc.h"
  26
  27 /*
  28  * Routines to parse arguments of macros.  Arguments follow the syntax
  29  * of `-arg [val [valN...]]'.  Arguments come in all types:  quoted
  30  * arguments, multiple arguments per value, no-value arguments, etc.
  31  *
  32  * There's no limit to the number or arguments that may be allocated.
  33  */
  34
  35 #define ARGV_NONE       (1 << 0)
  36 #define ARGV_SINGLE     (1 << 1)
  37 #define ARGV_MULTI      (1 << 2)
  38 #define ARGV_OPT_SINGLE (1 << 3)
  39
  40 #define MULTI_STEP       5
  41
  42 static  int              argv_a2arg(int, const char *);
  43 static  int              args(struct mdoc *, int, int *,
  44                                 char *, int, char **);
  45 static  int              argv(struct mdoc *, int,
  46                                 struct mdoc_argv *, int *, char *);
  47 static  int              argv_single(struct mdoc *, int,
  48                                 struct mdoc_argv *, int *, char *);
  49 static  int              argv_opt_single(struct mdoc *, int,
  50                                 struct mdoc_argv *, int *, char *);
  51 static  int              argv_multi(struct mdoc *, int,
  52                                 struct mdoc_argv *, int *, char *);
  53
  54 /* Per-argument flags. */
  55
  56 static  int mdoc_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_NONE,      /* MDOC_File */
  63         ARGV_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  int mdoc_argflags[MDOC_MAX] = {
  86         0, /* Ap */
  87         0, /* Dd */
  88         0, /* Dt */
  89         0, /* Os */
  90         0, /* Sh */
  91         0, /* Ss */
  92         ARGS_DELIM, /* 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         ARGS_DELIM, /* 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 };
 207
 208
 209 /*
 210  * Parse an argument from line text.  This comes in the form of -key
 211  * [value0...], which may either have a single mandatory value, at least
 212  * one mandatory value, an optional single value, or no value.
 213  */
 214 int
 215 mdoc_argv(struct mdoc *m, int line, int tok,
 216                 struct mdoc_arg **v, int *pos, char *buf)
 217 {
 218         char             *p, sv;
 219         struct mdoc_argv tmp;
 220         struct mdoc_arg  *arg;
 221
 222         if (0 == buf[*pos])
 223                 return(ARGV_EOLN);
 224
 225         assert(' ' != buf[*pos]);
 226
 227         /* Parse through to the first unescaped space. */
 228
 229         p = &buf[++(*pos)];
 230
 231         assert(*pos > 0);
 232
 233         /* LINTED */
 234         while (buf[*pos]) {
 235                 if (' ' == buf[*pos])
 236                         if ('\\' != buf[*pos - 1])
 237                                 break;
 238                 (*pos)++;
 239         }
 240
 241         /* XXX - save zeroed byte, if not an argument. */
 242
 243         sv = 0;
 244         if (buf[*pos]) {
 245                 sv = buf[*pos];
 246                 buf[(*pos)++] = 0;
 247         }
 248
 249         (void)memset(&tmp, 0, sizeof(struct mdoc_argv));
 250         tmp.line = line;
 251         tmp.pos = *pos;
 252
 253         /* See if our token accepts the argument. */
 254
 255         if (MDOC_ARG_MAX == (tmp.arg = argv_a2arg(tok, p))) {
 256                 /* XXX - restore saved zeroed byte. */
 257                 if (sv)
 258                         buf[*pos - 1] = sv;
 259                 return(ARGV_WORD);
 260         }
 261
 262         while (buf[*pos] && ' ' == buf[*pos])
 263                 (*pos)++;
 264
 265         if ( ! argv(m, line, &tmp, pos, buf))
 266                 return(ARGV_ERROR);
 267
 268         if (NULL == (arg = *v)) {
 269                 *v = calloc(1, sizeof(struct mdoc_arg));
 270                 if (NULL == *v) {
 271                         (void)mdoc_nerr(m, m->last, EMALLOC);
 272                         return(ARGV_ERROR);
 273                 }
 274                 arg = *v;
 275         }
 276
 277         arg->argc++;
 278         arg->argv = realloc(arg->argv, arg->argc *
 279                         sizeof(struct mdoc_argv));
 280
 281         if (NULL == arg->argv) {
 282                 (void)mdoc_nerr(m, m->last, EMALLOC);
 283                 return(ARGV_ERROR);
 284         }
 285
 286         (void)memcpy(&arg->argv[(int)arg->argc - 1],
 287                         &tmp, sizeof(struct mdoc_argv));
 288
 289         return(ARGV_ARG);
 290 }
 291
 292
 293 void
 294 mdoc_argv_free(struct mdoc_arg *p)
 295 {
 296         int              i, j;
 297
 298         if (NULL == p)
 299                 return;
 300
 301         if (p->refcnt) {
 302                 --(p->refcnt);
 303                 if (p->refcnt)
 304                         return;
 305         }
 306         assert(p->argc);
 307
 308         /* LINTED */
 309         for (i = 0; i < (int)p->argc; i++) {
 310                 if (0 == p->argv[i].sz)
 311                         continue;
 312                 /* LINTED */
 313                 for (j = 0; j < (int)p->argv[i].sz; j++)
 314                         free(p->argv[i].value[j]);
 315
 316                 free(p->argv[i].value);
 317         }
 318
 319         free(p->argv);
 320         free(p);
 321 }
 322
 323
 324 int
 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
 333 int
 334 mdoc_args(struct mdoc *m, int line,
 335                 int *pos, char *buf, int tok, char **v)
 336 {
 337         int               fl, c, i;
 338         struct mdoc_node *n;
 339
 340         fl = (0 == tok) ? 0 : mdoc_argflags[tok];
 341
 342         if (MDOC_It != tok)
 343                 return(args(m, line, pos, buf, fl, v));
 344
 345         /*
 346          * The `It' macro is a special case, as it acquires parameters from its
 347          * parent `Bl' context, specifically, we're concerned with -column.
 348          */
 349
 350         for (n = m->last; n; n = n->parent)
 351                 if (MDOC_BLOCK == n->type && MDOC_Bl == n->tok)
 352                         break;
 353
 354         assert(n);
 355         c = (int)(n->args ? n->args->argc : 0);
 356         assert(c > 0);
 357
 358         /* LINTED */
 359         for (i = 0; i < c; i++) {
 360                 if (MDOC_Column != n->args->argv[i].arg)
 361                         continue;
 362                 fl |= ARGS_TABSEP;
 363                 fl &= ~ARGS_DELIM;
 364                 break;
 365         }
 366
 367         return(args(m, line, pos, buf, fl, v));
 368 }
 369
 370
 371 static int
 372 args(struct mdoc *m, int line, int *pos,
 373                 char *buf, int fl, char **v)
 374 {
 375         int               i;
 376         char             *p, *pp;
 377
 378         /*
 379          * Parse out the terms (like `val' in `.Xx -arg val' or simply
 380          * `.Xx val'), which can have all sorts of properties:
 381          *
 382          *   ARGS_DELIM: use special handling if encountering trailing
 383          *   delimiters in the form of [[::delim::][ ]+]+.
 384          *
 385          *   ARGS_NOWARN: don't post warnings.  This is only used when
 386          *   re-parsing delimiters, as the warnings have already been
 387          *   posted.
 388          *
 389          *   ARGS_TABSEP: use special handling for tab/`Ta' separated
 390          *   phrases like in `Bl -column'.
 391          */
 392
 393         assert(*pos);
 394         assert(' ' != buf[*pos]);
 395
 396         if (0 == buf[*pos])
 397                 return(ARGS_EOLN);
 398
 399         /*
 400          * If the first character is a delimiter and we're to look for
 401          * delimited strings, then pass down the buffer seeing if it
 402          * follows the pattern of [[::delim::][ ]+]+.
 403          */
 404
 405         if ((fl & ARGS_DELIM) && mdoc_iscdelim(buf[*pos])) {
 406                 for (i = *pos; buf[i]; ) {
 407                         if ( ! mdoc_iscdelim(buf[i]))
 408                                 break;
 409                         i++;
 410                         if (0 == buf[i] || ' ' != buf[i])
 411                                 break;
 412                         i++;
 413                         while (buf[i] && ' ' == buf[i])
 414                                 i++;
 415                 }
 416
 417                 if (0 == buf[i]) {
 418                         *v = &buf[*pos];
 419                         if (' ' != buf[i - 1])
 420                                 return(ARGS_PUNCT);
 421                         if (ARGS_NOWARN & fl)
 422                                 return(ARGS_PUNCT);
 423                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 424                                 return(ARGS_ERROR);
 425                         return(ARGS_PUNCT);
 426                 }
 427         }
 428
 429         *v = &buf[*pos];
 430
 431         /*
 432          * First handle TABSEP items, restricted to `Bl -column'.  This
 433          * ignores conventional token parsing and instead uses tabs or
 434          * `Ta' macros to separate phrases.  Phrases are parsed again
 435          * for arguments at a later phase.
 436          */
 437
 438         if (ARGS_TABSEP & fl) {
 439                 /* Scan ahead to tab (can't be escaped). */
 440                 p = strchr(*v, '\t');
 441
 442                 /* Scan ahead to unescaped `Ta'. */
 443                 for (pp = *v; ; pp++) {
 444                         if (NULL == (pp = strstr(pp, "Ta")))
 445                                 break;
 446                         if (pp > *v && ' ' != *(pp - 1))
 447                                 continue;
 448                         if (' ' == *(pp + 2) || 0 == *(pp + 2))
 449                                 break;
 450                 }
 451
 452                 /*
 453                  * Adjust new-buffer position to be beyond delimiter
 454                  * mark (e.g., Ta -> end + 2).
 455                  */
 456                 if (p && pp) {
 457                         *pos += pp < p ? 2 : 1;
 458                         p = pp < p ? pp : p;
 459                 } else if (p && ! pp) {
 460                         *pos += 1;
 461                 } else if (pp && ! p) {
 462                         p = pp;
 463                         *pos += 2;
 464                 } else
 465                         p = strchr(*v, 0);
 466
 467                 /* Whitespace check for eoln case... */
 468                 if (0 == *p && ' ' == *(p - 1) && ! (ARGS_NOWARN & fl))
 469                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 470                                 return(ARGS_ERROR);
 471
 472                 *pos += (int)(p - *v);
 473
 474                 /* Strip delimiter's preceding whitespace. */
 475                 pp = p - 1;
 476                 while (pp > *v && ' ' == *pp) {
 477                         if (pp > *v && '\\' == *(pp - 1))
 478                                 break;
 479                         pp--;
 480                 }
 481                 *(pp + 1) = 0;
 482
 483                 /* Strip delimiter's proceeding whitespace. */
 484                 for (pp = &buf[*pos]; ' ' == *pp; pp++, (*pos)++)
 485                         /* Skip ahead. */ ;
 486
 487                 return(ARGS_PHRASE);
 488         }
 489
 490         /*
 491          * Process a quoted literal.  A quote begins with a double-quote
 492          * and ends with a double-quote NOT preceded by a double-quote.
 493          * Whitespace is NOT involved in literal termination.
 494          */
 495
 496         if ('\"' == buf[*pos]) {
 497                 *v = &buf[++(*pos)];
 498
 499                 for ( ; buf[*pos]; (*pos)++) {
 500                         if ('\"' != buf[*pos])
 501                                 continue;
 502                         if ('\"' != buf[*pos + 1])
 503                                 break;
 504                         (*pos)++;
 505                 }
 506
 507                 if (0 == buf[*pos]) {
 508                         if (ARGS_NOWARN & fl)
 509                                 return(ARGS_QWORD);
 510                         if ( ! mdoc_pwarn(m, line, *pos, EQUOTTERM))
 511                                 return(ARGS_ERROR);
 512                         return(ARGS_QWORD);
 513                 }
 514
 515                 buf[(*pos)++] = 0;
 516
 517                 if (0 == buf[*pos])
 518                         return(ARGS_QWORD);
 519
 520                 while (' ' == buf[*pos])
 521                         (*pos)++;
 522
 523                 if (0 == buf[*pos] && ! (ARGS_NOWARN & fl))
 524                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 525                                 return(ARGS_ERROR);
 526
 527                 return(ARGS_QWORD);
 528         }
 529
 530         /*
 531          * A non-quoted term progresses until either the end of line or
 532          * a non-escaped whitespace.
 533          */
 534
 535         for ( ; buf[*pos]; (*pos)++)
 536                 if (' ' == buf[*pos] && '\\' != buf[*pos - 1])
 537                         break;
 538
 539         if (0 == buf[*pos])
 540                 return(ARGS_WORD);
 541
 542         buf[(*pos)++] = 0;
 543
 544         while (' ' == buf[*pos])
 545                 (*pos)++;
 546
 547         if (0 == buf[*pos] && ! (ARGS_NOWARN & fl))
 548                 if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 549                         return(ARGS_ERROR);
 550
 551         return(ARGS_WORD);
 552 }
 553
 554
 555 static int
 556 argv_a2arg(int tok, const char *argv)
 557 {
 558
 559         /*
 560          * Parse an argument identifier from its text.  XXX - this
 561          * should really be table-driven to clarify the code.
 562          *
 563          * If you add an argument to the list, make sure that you
 564          * register it here with its one or more macros!
 565          */
 566
 567         switch (tok) {
 568         case (MDOC_An):
 569                 if (0 == strcmp(argv, "split"))
 570                         return(MDOC_Split);
 571                 else if (0 == strcmp(argv, "nosplit"))
 572                         return(MDOC_Nosplit);
 573                 break;
 574
 575         case (MDOC_Bd):
 576                 if (0 == strcmp(argv, "ragged"))
 577                         return(MDOC_Ragged);
 578                 else if (0 == strcmp(argv, "unfilled"))
 579                         return(MDOC_Unfilled);
 580                 else if (0 == strcmp(argv, "filled"))
 581                         return(MDOC_Filled);
 582                 else if (0 == strcmp(argv, "literal"))
 583                         return(MDOC_Literal);
 584                 else if (0 == strcmp(argv, "file"))
 585                         return(MDOC_File);
 586                 else if (0 == strcmp(argv, "offset"))
 587                         return(MDOC_Offset);
 588                 else if (0 == strcmp(argv, "compact"))
 589                         return(MDOC_Compact);
 590                 break;
 591
 592         case (MDOC_Bf):
 593                 if (0 == strcmp(argv, "emphasis"))
 594                         return(MDOC_Emphasis);
 595                 else if (0 == strcmp(argv, "literal"))
 596                         return(MDOC_Literal);
 597                 else if (0 == strcmp(argv, "symbolic"))
 598                         return(MDOC_Symbolic);
 599                 break;
 600
 601         case (MDOC_Bk):
 602                 if (0 == strcmp(argv, "words"))
 603                         return(MDOC_Words);
 604                 break;
 605
 606         case (MDOC_Bl):
 607                 if (0 == strcmp(argv, "bullet"))
 608                         return(MDOC_Bullet);
 609                 else if (0 == strcmp(argv, "dash"))
 610                         return(MDOC_Dash);
 611                 else if (0 == strcmp(argv, "hyphen"))
 612                         return(MDOC_Hyphen);
 613                 else if (0 == strcmp(argv, "item"))
 614                         return(MDOC_Item);
 615                 else if (0 == strcmp(argv, "enum"))
 616                         return(MDOC_Enum);
 617                 else if (0 == strcmp(argv, "tag"))
 618                         return(MDOC_Tag);
 619                 else if (0 == strcmp(argv, "diag"))
 620                         return(MDOC_Diag);
 621                 else if (0 == strcmp(argv, "hang"))
 622                         return(MDOC_Hang);
 623                 else if (0 == strcmp(argv, "ohang"))
 624                         return(MDOC_Ohang);
 625                 else if (0 == strcmp(argv, "inset"))
 626                         return(MDOC_Inset);
 627                 else if (0 == strcmp(argv, "column"))
 628                         return(MDOC_Column);
 629                 else if (0 == strcmp(argv, "width"))
 630                         return(MDOC_Width);
 631                 else if (0 == strcmp(argv, "offset"))
 632                         return(MDOC_Offset);
 633                 else if (0 == strcmp(argv, "compact"))
 634                         return(MDOC_Compact);
 635                 else if (0 == strcmp(argv, "nested"))
 636                         return(MDOC_Nested);
 637                 break;
 638
 639         case (MDOC_Rv):
 640                 /* FALLTHROUGH */
 641         case (MDOC_Ex):
 642                 if (0 == strcmp(argv, "std"))
 643                         return(MDOC_Std);
 644                 break;
 645         default:
 646                 break;
 647         }
 648
 649         return(MDOC_ARG_MAX);
 650 }
 651
 652
 653 static int
 654 argv_multi(struct mdoc *m, int line,
 655                 struct mdoc_argv *v, int *pos, char *buf)
 656 {
 657         int              c;
 658         char            *p;
 659
 660         for (v->sz = 0; ; v->sz++) {
 661                 if ('-' == buf[*pos])
 662                         break;
 663                 c = args(m, line, pos, buf, 0, &p);
 664                 if (ARGS_ERROR == c)
 665                         return(0);
 666                 else if (ARGS_EOLN == c)
 667                         break;
 668
 669                 if (0 == v->sz % MULTI_STEP) {
 670                         v->value = realloc(v->value,
 671                                 (v->sz + MULTI_STEP) * sizeof(char *));
 672                         if (NULL == v->value) {
 673                                 (void)mdoc_nerr(m, m->last, EMALLOC);
 674                                 return(ARGV_ERROR);
 675                         }
 676                 }
 677                 if (NULL == (v->value[(int)v->sz] = strdup(p)))
 678                         return(mdoc_nerr(m, m->last, EMALLOC));
 679         }
 680
 681         return(1);
 682 }
 683
 684
 685 static int
 686 argv_opt_single(struct mdoc *m, int line,
 687                 struct mdoc_argv *v, int *pos, char *buf)
 688 {
 689         int              c;
 690         char            *p;
 691
 692         if ('-' == buf[*pos])
 693                 return(1);
 694
 695         c = args(m, line, pos, buf, 0, &p);
 696         if (ARGS_ERROR == c)
 697                 return(0);
 698         if (ARGS_EOLN == c)
 699                 return(1);
 700
 701         v->sz = 1;
 702         if (NULL == (v->value = calloc(1, sizeof(char *))))
 703                 return(mdoc_nerr(m, m->last, EMALLOC));
 704         if (NULL == (v->value[0] = strdup(p)))
 705                 return(mdoc_nerr(m, m->last, EMALLOC));
 706
 707         return(1);
 708 }
 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              c, ppos;
 719         char            *p;
 720
 721         ppos = *pos;
 722
 723         c = args(m, line, pos, buf, 0, &p);
 724         if (ARGS_ERROR == c)
 725                 return(0);
 726         if (ARGS_EOLN == c)
 727                 return(mdoc_perr(m, line, ppos, EARGVAL));
 728
 729         v->sz = 1;
 730         if (NULL == (v->value = calloc(1, sizeof(char *))))
 731                 return(mdoc_nerr(m, m->last, EMALLOC));
 732         if (NULL == (v->value[0] = strdup(p)))
 733                 return(mdoc_nerr(m, m->last, EMALLOC));
 734
 735         return(1);
 736 }
 737
 738
 739 /*
 740  * Determine rules for parsing arguments.  Arguments can either accept
 741  * no parameters, an optional single parameter, one parameter, or
 742  * multiple parameters.
 743  */
 744 static int
 745 argv(struct mdoc *mdoc, int line,
 746                 struct mdoc_argv *v, int *pos, char *buf)
 747 {
 748
 749         v->sz = 0;
 750         v->value = NULL;
 751
 752         switch (mdoc_argvflags[v->arg]) {
 753         case (ARGV_SINGLE):
 754                 return(argv_single(mdoc, line, v, pos, buf));
 755         case (ARGV_MULTI):
 756                 return(argv_multi(mdoc, line, v, pos, buf));
 757         case (ARGV_OPT_SINGLE):
 758                 return(argv_opt_single(mdoc, line, v, pos, buf));
 759         default:
 760                 /* ARGV_NONE */
 761                 break;
 762         }
 763
 764         return(1);
 765 }