argv.c

   1 /* $Id: argv.c,v 1.55 2009/03/21 21:09:00 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@openbsd.org>
   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
   7  * above copyright notice and this permission notice appear in all
   8  * copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
  11  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  12  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
  13  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  14  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  15  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  16  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include <sys/types.h>
  20
  21 #include <assert.h>
  22 #include <ctype.h>
  23 #include <err.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27
  28 #include "private.h"
  29
  30 /*
  31  * Routines to parse arguments of macros.  Arguments follow the syntax
  32  * of `-arg [val [valN...]]'.  Arguments come in all types:  quoted
  33  * arguments, multiple arguments per value, no-value arguments, etc.
  34  *
  35  * There's no limit to the number or arguments that may be allocated.
  36  */
  37
  38 #define ARGS_QUOTED     (1 << 0)
  39 #define ARGS_DELIM      (1 << 1)
  40 #define ARGS_TABSEP     (1 << 2)
  41 #define ARGS_ARGVLIKE   (1 << 3)
  42
  43 #define ARGV_NONE       (1 << 0)
  44 #define ARGV_SINGLE     (1 << 1)
  45 #define ARGV_MULTI      (1 << 2)
  46 #define ARGV_OPT_SINGLE (1 << 3)
  47
  48 #define MULTI_STEP       5
  49
  50 enum    mwarn {
  51         WQUOTPARM,
  52         WARGVPARM,
  53         WCOLEMPTY,
  54         WTAILWS
  55 };
  56
  57 enum    merr {
  58         EQUOTTERM,
  59         EARGVAL
  60 };
  61
  62 static  int              argv_a2arg(int, const char *);
  63 static  int              args(struct mdoc *, int, int *,
  64                                 char *, int, char **);
  65 static  int              argv(struct mdoc *, int,
  66                                 struct mdoc_argv *, int *, char *);
  67 static  int              argv_single(struct mdoc *, int,
  68                                 struct mdoc_argv *, int *, char *);
  69 static  int              argv_opt_single(struct mdoc *, int,
  70                                 struct mdoc_argv *, int *, char *);
  71 static  int              argv_multi(struct mdoc *, int,
  72                                 struct mdoc_argv *, int *, char *);
  73 static  int              pwarn(struct mdoc *, int, int, enum mwarn);
  74 static  int              perr(struct mdoc *, int, int, enum merr);
  75
  76 /* Per-argument flags. */
  77
  78 static  int mdoc_argvflags[MDOC_ARG_MAX] = {
  79         ARGV_NONE,      /* MDOC_Split */
  80         ARGV_NONE,      /* MDOC_Nosplit */
  81         ARGV_NONE,      /* MDOC_Ragged */
  82         ARGV_NONE,      /* MDOC_Unfilled */
  83         ARGV_NONE,      /* MDOC_Literal */
  84         ARGV_NONE,      /* MDOC_File */
  85         ARGV_SINGLE,    /* MDOC_Offset */
  86         ARGV_NONE,      /* MDOC_Bullet */
  87         ARGV_NONE,      /* MDOC_Dash */
  88         ARGV_NONE,      /* MDOC_Hyphen */
  89         ARGV_NONE,      /* MDOC_Item */
  90         ARGV_NONE,      /* MDOC_Enum */
  91         ARGV_NONE,      /* MDOC_Tag */
  92         ARGV_NONE,      /* MDOC_Diag */
  93         ARGV_NONE,      /* MDOC_Hang */
  94         ARGV_NONE,      /* MDOC_Ohang */
  95         ARGV_NONE,      /* MDOC_Inset */
  96         ARGV_MULTI,     /* MDOC_Column */
  97         ARGV_SINGLE,    /* MDOC_Width */
  98         ARGV_NONE,      /* MDOC_Compact */
  99         ARGV_OPT_SINGLE, /* MDOC_Std */
 100         ARGV_NONE,      /* MDOC_Filled */
 101         ARGV_NONE,      /* MDOC_Words */
 102         ARGV_NONE,      /* MDOC_Emphasis */
 103         ARGV_NONE,      /* MDOC_Symbolic */
 104         ARGV_NONE       /* MDOC_Symbolic */
 105 };
 106
 107 static  int mdoc_argflags[MDOC_MAX] = {
 108         0, /* \" */
 109         0, /* Dd */
 110         0, /* Dt */
 111         0, /* Os */
 112         0, /* Sh */
 113         0, /* Ss */
 114         ARGS_DELIM, /* Pp */
 115         ARGS_DELIM, /* D1 */
 116         ARGS_DELIM, /* Dl */
 117         0, /* Bd */
 118         0, /* Ed */
 119         0, /* Bl */
 120         0, /* El */
 121         0, /* It */
 122         ARGS_DELIM, /* Ad */
 123         ARGS_DELIM, /* An */
 124         ARGS_DELIM, /* Ar */
 125         ARGS_QUOTED, /* Cd */
 126         ARGS_DELIM, /* Cm */
 127         ARGS_DELIM, /* Dv */
 128         ARGS_DELIM, /* Er */
 129         ARGS_DELIM, /* Ev */
 130         0, /* Ex */
 131         ARGS_DELIM | ARGS_QUOTED, /* Fa */
 132         0, /* Fd */
 133         ARGS_DELIM, /* Fl */
 134         ARGS_DELIM | ARGS_QUOTED, /* Fn */
 135         ARGS_DELIM | ARGS_QUOTED, /* Ft */
 136         ARGS_DELIM, /* Ic */
 137         0, /* In */
 138         ARGS_DELIM, /* Li */
 139         0, /* Nd */
 140         ARGS_DELIM, /* Nm */
 141         ARGS_DELIM, /* Op */
 142         0, /* Ot */
 143         ARGS_DELIM, /* Pa */
 144         0, /* Rv */
 145         ARGS_DELIM | ARGS_ARGVLIKE, /* St */
 146         ARGS_DELIM, /* Va */
 147         ARGS_DELIM, /* Vt */
 148         ARGS_DELIM, /* Xr */
 149         ARGS_QUOTED, /* %A */
 150         ARGS_QUOTED, /* %B */
 151         ARGS_QUOTED, /* %D */
 152         ARGS_QUOTED, /* %I */
 153         ARGS_QUOTED, /* %J */
 154         ARGS_QUOTED, /* %N */
 155         ARGS_QUOTED, /* %O */
 156         ARGS_QUOTED, /* %P */
 157         ARGS_QUOTED, /* %R */
 158         ARGS_QUOTED, /* %T */
 159         ARGS_QUOTED, /* %V */
 160         ARGS_DELIM, /* Ac */
 161         0, /* Ao */
 162         ARGS_DELIM, /* Aq */
 163         ARGS_DELIM, /* At */
 164         ARGS_DELIM, /* Bc */
 165         0, /* Bf */
 166         0, /* Bo */
 167         ARGS_DELIM, /* Bq */
 168         ARGS_DELIM, /* Bsx */
 169         ARGS_DELIM, /* Bx */
 170         0, /* Db */
 171         ARGS_DELIM, /* Dc */
 172         0, /* Do */
 173         ARGS_DELIM, /* Dq */
 174         ARGS_DELIM, /* Ec */
 175         0, /* Ef */
 176         ARGS_DELIM, /* Em */
 177         0, /* Eo */
 178         ARGS_DELIM, /* Fx */
 179         ARGS_DELIM, /* Ms */
 180         ARGS_DELIM, /* No */
 181         ARGS_DELIM, /* Ns */
 182         ARGS_DELIM, /* Nx */
 183         ARGS_DELIM, /* Ox */
 184         ARGS_DELIM, /* Pc */
 185         ARGS_DELIM, /* Pf */
 186         0, /* Po */
 187         ARGS_DELIM, /* Pq */
 188         ARGS_DELIM, /* Qc */
 189         ARGS_DELIM, /* Ql */
 190         0, /* Qo */
 191         ARGS_DELIM, /* Qq */
 192         0, /* Re */
 193         0, /* Rs */
 194         ARGS_DELIM, /* Sc */
 195         0, /* So */
 196         ARGS_DELIM, /* Sq */
 197         0, /* Sm */
 198         ARGS_DELIM, /* Sx */
 199         ARGS_DELIM, /* Sy */
 200         ARGS_DELIM, /* Tn */
 201         ARGS_DELIM, /* Ux */
 202         ARGS_DELIM, /* Xc */
 203         0, /* Xo */
 204         0, /* Fo */
 205         0, /* Fc */
 206         0, /* Oo */
 207         ARGS_DELIM, /* Oc */
 208         0, /* Bk */
 209         0, /* Ek */
 210         0, /* Bt */
 211         0, /* Hf */
 212         0, /* Fr */
 213         0, /* Ud */
 214         0, /* Lb */
 215         0, /* Ap */
 216         ARGS_DELIM, /* Lp */
 217         ARGS_DELIM | ARGS_QUOTED, /* Lk */
 218         ARGS_DELIM | ARGS_QUOTED, /* Mt */
 219         ARGS_DELIM, /* Brq */
 220         0, /* Bro */
 221         ARGS_DELIM, /* Brc */
 222         ARGS_QUOTED, /* %C */
 223         0, /* Es */
 224         0, /* En */
 225         0, /* Dx */
 226         ARGS_QUOTED, /* %Q */
 227 };
 228
 229
 230 /*
 231  * Parse an argument from line text.  This comes in the form of -key
 232  * [value0...], which may either have a single mandatory value, at least
 233  * one mandatory value, an optional single value, or no value.
 234  */
 235 int
 236 mdoc_argv(struct mdoc *mdoc, int line, int tok,
 237                 struct mdoc_arg **v, int *pos, char *buf)
 238 {
 239         int               i;
 240         char             *p, sv;
 241         struct mdoc_argv tmp;
 242         struct mdoc_arg  *arg;
 243
 244         if (0 == buf[*pos])
 245                 return(ARGV_EOLN);
 246
 247         assert(' ' != buf[*pos]);
 248
 249         if ('-' != buf[*pos] || ARGS_ARGVLIKE & mdoc_argflags[tok])
 250                 return(ARGV_WORD);
 251
 252         /* Parse through to the first unescaped space. */
 253
 254         i = *pos;
 255         p = &buf[++(*pos)];
 256
 257         assert(*pos > 0);
 258
 259         /* LINTED */
 260         while (buf[*pos]) {
 261                 if (' ' == buf[*pos])
 262                         if ('\\' != buf[*pos - 1])
 263                                 break;
 264                 (*pos)++;
 265         }
 266
 267         /* XXX - save zeroed byte, if not an argument. */
 268
 269         sv = 0;
 270         if (buf[*pos]) {
 271                 sv = buf[*pos];
 272                 buf[(*pos)++] = 0;
 273         }
 274
 275         (void)memset(&tmp, 0, sizeof(struct mdoc_argv));
 276         tmp.line = line;
 277         tmp.pos = *pos;
 278
 279         /* See if our token accepts the argument. */
 280
 281         if (MDOC_ARG_MAX == (tmp.arg = argv_a2arg(tok, p))) {
 282                 /* XXX - restore saved zeroed byte. */
 283                 if (sv)
 284                         buf[*pos - 1] = sv;
 285                 if ( ! pwarn(mdoc, line, i, WARGVPARM))
 286                         return(ARGV_ERROR);
 287                 return(ARGV_WORD);
 288         }
 289
 290         while (buf[*pos] && ' ' == buf[*pos])
 291                 (*pos)++;
 292
 293         if ( ! argv(mdoc, line, &tmp, pos, buf))
 294                 return(ARGV_ERROR);
 295
 296         if (NULL == (arg = *v)) {
 297                 *v = xcalloc(1, sizeof(struct mdoc_arg));
 298                 arg = *v;
 299         }
 300
 301         arg->argc++;
 302         arg->argv = xrealloc(arg->argv, arg->argc *
 303                         sizeof(struct mdoc_argv));
 304
 305         (void)memcpy(&arg->argv[(int)arg->argc - 1],
 306                         &tmp, sizeof(struct mdoc_argv));
 307
 308         return(ARGV_ARG);
 309 }
 310
 311
 312 void
 313 mdoc_argv_free(struct mdoc_arg *p)
 314 {
 315         int              i, j;
 316
 317         if (NULL == p)
 318                 return;
 319
 320         if (p->refcnt) {
 321                 --(p->refcnt);
 322                 if (p->refcnt)
 323                         return;
 324         }
 325
 326         assert(p->argc);
 327
 328         /* LINTED */
 329         for (i = 0; i < (int)p->argc; i++) {
 330                 if (0 == p->argv[i].sz)
 331                         continue;
 332                 /* LINTED */
 333                 for (j = 0; j < (int)p->argv[i].sz; j++)
 334                         free(p->argv[i].value[j]);
 335
 336                 free(p->argv[i].value);
 337         }
 338
 339         free(p->argv);
 340         free(p);
 341 }
 342
 343
 344
 345 static int
 346 perr(struct mdoc *mdoc, int line, int pos, enum merr code)
 347 {
 348         char            *p;
 349
 350         p = NULL;
 351
 352         switch (code) {
 353         case (EQUOTTERM):
 354                 p = "unterminated quoted parameter";
 355                 break;
 356         case (EARGVAL):
 357                 p = "argument requires a value";
 358                 break;
 359         }
 360
 361         assert(p);
 362         return(mdoc_perr(mdoc, line, pos, p));
 363 }
 364
 365
 366 static int
 367 pwarn(struct mdoc *mdoc, int line, int pos, enum mwarn code)
 368 {
 369         char            *p;
 370         int              c;
 371
 372         p = NULL;
 373         c = WARN_SYNTAX;
 374
 375         switch (code) {
 376         case (WQUOTPARM):
 377                 p = "unexpected quoted parameter";
 378                 break;
 379         case (WARGVPARM):
 380                 p = "argument-like parameter";
 381                 break;
 382         case (WCOLEMPTY):
 383                 p = "last list column is empty";
 384                 c = WARN_COMPAT;
 385                 break;
 386         case (WTAILWS):
 387                 p = "trailing whitespace";
 388                 c = WARN_COMPAT;
 389                 break;
 390         }
 391
 392         assert(p);
 393         return(mdoc_pwarn(mdoc, line, pos, c, p));
 394 }
 395
 396
 397 int
 398 mdoc_args(struct mdoc *mdoc, int line,
 399                 int *pos, char *buf, int tok, char **v)
 400 {
 401         int               fl, c, i;
 402         struct mdoc_node *n;
 403
 404         fl = (0 == tok) ? 0 : mdoc_argflags[tok];
 405
 406         /*
 407          * Override per-macro argument flags with context-specific ones.
 408          * As of now, this is only valid for `It' depending on its list
 409          * context.
 410          */
 411
 412         switch (tok) {
 413         case (MDOC_It):
 414                 for (n = mdoc->last; n; n = n->parent)
 415                         if (MDOC_BLOCK == n->type && MDOC_Bl == n->tok)
 416                                 break;
 417
 418                 assert(n);
 419                 c = (int)(n->args ? n->args->argc : 0);
 420                 assert(c > 0);
 421
 422                 /*
 423                  * Using `Bl -column' adds ARGS_TABSEP to the arguments
 424                  * and invalidates ARGS_DELIM.  Using `Bl -diag' allows
 425                  * for quoted arguments.
 426                  */
 427
 428                 /* LINTED */
 429                 for (i = 0; i < c; i++) {
 430                         switch (n->args->argv[i].arg) {
 431                         case (MDOC_Column):
 432                                 fl |= ARGS_TABSEP;
 433                                 fl &= ~ARGS_DELIM;
 434                                 i = c;
 435                                 break;
 436                         case (MDOC_Diag):
 437                                 fl |= ARGS_QUOTED;
 438                                 i = c;
 439                                 break;
 440                         default:
 441                                 break;
 442                         }
 443                 }
 444                 break;
 445         default:
 446                 break;
 447         }
 448
 449         return(args(mdoc, line, pos, buf, fl, v));
 450 }
 451
 452
 453 static int
 454 args(struct mdoc *mdoc, int line,
 455                 int *pos, char *buf, int fl, char **v)
 456 {
 457         int               i;
 458         char             *p, *pp;
 459
 460         assert(*pos > 0);
 461
 462         if (0 == buf[*pos])
 463                 return(ARGS_EOLN);
 464
 465         if ('\"' == buf[*pos] && ! (fl & ARGS_QUOTED))
 466                 if ( ! pwarn(mdoc, line, *pos, WQUOTPARM))
 467                         return(ARGS_ERROR);
 468
 469         if ( ! (fl & ARGS_ARGVLIKE) && '-' == buf[*pos])
 470                 if ( ! pwarn(mdoc, line, *pos, WARGVPARM))
 471                         return(ARGS_ERROR);
 472
 473         /*
 474          * If the first character is a delimiter and we're to look for
 475          * delimited strings, then pass down the buffer seeing if it
 476          * follows the pattern of [[::delim::][ ]+]+.
 477          */
 478
 479         if ((fl & ARGS_DELIM) && mdoc_iscdelim(buf[*pos])) {
 480                 for (i = *pos; buf[i]; ) {
 481                         if ( ! mdoc_iscdelim(buf[i]))
 482                                 break;
 483                         i++;
 484                         /* There must be at least one space... */
 485                         if (0 == buf[i] || ' ' != buf[i])
 486                                 break;
 487                         i++;
 488                         while (buf[i] && ' ' == buf[i])
 489                                 i++;
 490                 }
 491                 if (0 == buf[i]) {
 492                         *v = &buf[*pos];
 493                         return(ARGS_PUNCT);
 494                 }
 495         }
 496
 497         /* First parse non-quoted strings. */
 498
 499         if ('\"' != buf[*pos] || ! (ARGS_QUOTED & fl)) {
 500                 *v = &buf[*pos];
 501
 502                 /*
 503                  * Thar be dragons here!  If we're tab-separated, search
 504                  * ahead for either a tab or the `Ta' macro.
 505                  * If a `Ta' is detected, it must be space-buffered before and
 506                  * after.  If either of these hold true, then prune out the
 507                  * extra spaces and call it an argument.
 508                  */
 509
 510                 if (ARGS_TABSEP & fl) {
 511                         /* Scan ahead to unescaped tab. */
 512
 513                         p = strchr(*v, '\t');
 514
 515                         /* Scan ahead to unescaped `Ta'. */
 516
 517                         for (pp = *v; ; pp++) {
 518                                 if (NULL == (pp = strstr(pp, "Ta")))
 519                                         break;
 520                                 if (pp > *v && ' ' != *(pp - 1))
 521                                         continue;
 522                                 if (' ' == *(pp + 2) || 0 == *(pp + 2))
 523                                         break;
 524                         }
 525
 526                         /* Choose delimiter tab/Ta. */
 527
 528                         if (p && pp)
 529                                 p = (p < pp ? p : pp);
 530                         else if ( ! p && pp)
 531                                 p = pp;
 532
 533                         /* Strip delimiter's preceding whitespace. */
 534
 535                         if (p && p > *v) {
 536                                 pp = p - 1;
 537                                 while (pp > *v && ' ' == *pp)
 538                                         pp--;
 539                                 if (pp == *v && ' ' == *pp)
 540                                         *pp = 0;
 541                                 else if (' ' == *pp)
 542                                         *(pp + 1) = 0;
 543                         }
 544
 545                         /* ...in- and proceding whitespace. */
 546
 547                         if (p && ('\t' != *p)) {
 548                                 *p++ = 0;
 549                                 *p++ = 0;
 550                         } else if (p)
 551                                 *p++ = 0;
 552
 553                         if (p) {
 554                                 while (' ' == *p)
 555                                         p++;
 556                                 if (0 != *p)
 557                                         *(p - 1) = 0;
 558                                 *pos += (int)(p - *v);
 559                         }
 560
 561                         if (p && 0 == *p)
 562                                 if ( ! pwarn(mdoc, line, *pos, WCOLEMPTY))
 563                                         return(0);
 564                         if (p && 0 == *p && p > *v && ' ' == *(p - 1))
 565                                 if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 566                                         return(0);
 567
 568                         if (p)
 569                                 return(ARGS_PHRASE);
 570
 571                         /* Configure the eoln case, too. */
 572
 573                         p = strchr(*v, 0);
 574                         assert(p);
 575
 576                         if (p > *v && ' ' == *(p - 1))
 577                                 if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 578                                         return(0);
 579                         *pos += (int)(p - *v);
 580
 581                         return(ARGS_PHRASE);
 582                 }
 583
 584                 /* Do non-tabsep look-ahead here. */
 585
 586                 if ( ! (ARGS_TABSEP & fl))
 587                         while (buf[*pos]) {
 588                                 if (' ' == buf[*pos])
 589                                         if ('\\' != buf[*pos - 1])
 590                                                 break;
 591                                 (*pos)++;
 592                         }
 593
 594                 if (0 == buf[*pos])
 595                         return(ARGS_WORD);
 596
 597                 buf[(*pos)++] = 0;
 598
 599                 if (0 == buf[*pos])
 600                         return(ARGS_WORD);
 601
 602                 if ( ! (ARGS_TABSEP & fl))
 603                         while (buf[*pos] && ' ' == buf[*pos])
 604                                 (*pos)++;
 605
 606                 if (buf[*pos])
 607                         return(ARGS_WORD);
 608
 609                 if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 610                         return(ARGS_ERROR);
 611
 612                 return(ARGS_WORD);
 613         }
 614
 615         /*
 616          * If we're a quoted string (and quoted strings are allowed),
 617          * then parse ahead to the next quote.  If none's found, it's an
 618          * error.  After, parse to the next word.
 619          */
 620
 621         *v = &buf[++(*pos)];
 622
 623         while (buf[*pos] && '\"' != buf[*pos])
 624                 (*pos)++;
 625
 626         if (0 == buf[*pos]) {
 627                 (void)perr(mdoc, line, *pos, EQUOTTERM);
 628                 return(ARGS_ERROR);
 629         }
 630
 631         buf[(*pos)++] = 0;
 632         if (0 == buf[*pos])
 633                 return(ARGS_QWORD);
 634
 635         while (buf[*pos] && ' ' == buf[*pos])
 636                 (*pos)++;
 637
 638         if (buf[*pos])
 639                 return(ARGS_QWORD);
 640
 641         if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 642                 return(ARGS_ERROR);
 643
 644         return(ARGS_QWORD);
 645 }
 646
 647
 648 static int
 649 argv_a2arg(int tok, const char *argv)
 650 {
 651
 652         /*
 653          * Parse an argument identifier from its text.  XXX - this
 654          * should really be table-driven to clarify the code.
 655          *
 656          * If you add an argument to the list, make sure that you
 657          * register it here with its one or more macros!
 658          */
 659
 660         switch (tok) {
 661         case (MDOC_An):
 662                 if (xstrcmp(argv, "split"))
 663                         return(MDOC_Split);
 664                 else if (xstrcmp(argv, "nosplit"))
 665                         return(MDOC_Nosplit);
 666                 break;
 667
 668         case (MDOC_Bd):
 669                 if (xstrcmp(argv, "ragged"))
 670                         return(MDOC_Ragged);
 671                 else if (xstrcmp(argv, "unfilled"))
 672                         return(MDOC_Unfilled);
 673                 else if (xstrcmp(argv, "filled"))
 674                         return(MDOC_Filled);
 675                 else if (xstrcmp(argv, "literal"))
 676                         return(MDOC_Literal);
 677                 else if (xstrcmp(argv, "file"))
 678                         return(MDOC_File);
 679                 else if (xstrcmp(argv, "offset"))
 680                         return(MDOC_Offset);
 681                 else if (xstrcmp(argv, "compact"))
 682                         return(MDOC_Compact);
 683                 break;
 684
 685         case (MDOC_Bf):
 686                 if (xstrcmp(argv, "emphasis"))
 687                         return(MDOC_Emphasis);
 688                 else if (xstrcmp(argv, "literal"))
 689                         return(MDOC_Literal);
 690                 else if (xstrcmp(argv, "symbolic"))
 691                         return(MDOC_Symbolic);
 692                 break;
 693
 694         case (MDOC_Bk):
 695                 if (xstrcmp(argv, "words"))
 696                         return(MDOC_Words);
 697                 break;
 698
 699         case (MDOC_Bl):
 700                 if (xstrcmp(argv, "bullet"))
 701                         return(MDOC_Bullet);
 702                 else if (xstrcmp(argv, "dash"))
 703                         return(MDOC_Dash);
 704                 else if (xstrcmp(argv, "hyphen"))
 705                         return(MDOC_Hyphen);
 706                 else if (xstrcmp(argv, "item"))
 707                         return(MDOC_Item);
 708                 else if (xstrcmp(argv, "enum"))
 709                         return(MDOC_Enum);
 710                 else if (xstrcmp(argv, "tag"))
 711                         return(MDOC_Tag);
 712                 else if (xstrcmp(argv, "diag"))
 713                         return(MDOC_Diag);
 714                 else if (xstrcmp(argv, "hang"))
 715                         return(MDOC_Hang);
 716                 else if (xstrcmp(argv, "ohang"))
 717                         return(MDOC_Ohang);
 718                 else if (xstrcmp(argv, "inset"))
 719                         return(MDOC_Inset);
 720                 else if (xstrcmp(argv, "column"))
 721                         return(MDOC_Column);
 722                 else if (xstrcmp(argv, "width"))
 723                         return(MDOC_Width);
 724                 else if (xstrcmp(argv, "offset"))
 725                         return(MDOC_Offset);
 726                 else if (xstrcmp(argv, "compact"))
 727                         return(MDOC_Compact);
 728                 else if (xstrcmp(argv, "nested"))
 729                         return(MDOC_Nested);
 730                 break;
 731
 732         case (MDOC_Rv):
 733                 /* FALLTHROUGH */
 734         case (MDOC_Ex):
 735                 if (xstrcmp(argv, "std"))
 736                         return(MDOC_Std);
 737                 break;
 738         default:
 739                 break;
 740         }
 741
 742         return(MDOC_ARG_MAX);
 743 }
 744
 745
 746 static int
 747 argv_multi(struct mdoc *mdoc, int line,
 748                 struct mdoc_argv *v, int *pos, char *buf)
 749 {
 750         int              c, ppos;
 751         char            *p;
 752
 753         ppos = *pos;
 754
 755         for (v->sz = 0; ; v->sz++) {
 756                 if ('-' == buf[*pos])
 757                         break;
 758                 c = args(mdoc, line, pos, buf, ARGS_QUOTED, &p);
 759                 if (ARGS_ERROR == c)
 760                         return(0);
 761                 else if (ARGS_EOLN == c)
 762                         break;
 763
 764                 if (0 == v->sz % MULTI_STEP)
 765                         v->value = xrealloc(v->value,
 766                                 (v->sz + MULTI_STEP) * sizeof(char *));
 767
 768                 v->value[(int)v->sz] = xstrdup(p);
 769         }
 770
 771         if (v->sz)
 772                 return(1);
 773
 774         return(perr(mdoc, line, ppos, EARGVAL));
 775 }
 776
 777
 778 static int
 779 argv_opt_single(struct mdoc *mdoc, int line,
 780                 struct mdoc_argv *v, int *pos, char *buf)
 781 {
 782         int              c;
 783         char            *p;
 784
 785         if ('-' == buf[*pos])
 786                 return(1);
 787
 788         c = args(mdoc, line, pos, buf, ARGS_QUOTED, &p);
 789         if (ARGS_ERROR == c)
 790                 return(0);
 791         if (ARGS_EOLN == c)
 792                 return(1);
 793
 794         v->sz = 1;
 795         v->value = xcalloc(1, sizeof(char *));
 796         v->value[0] = xstrdup(p);
 797         return(1);
 798 }
 799
 800
 801 /*
 802  * Parse a single, mandatory value from the stream.
 803  */
 804 static int
 805 argv_single(struct mdoc *mdoc, int line,
 806                 struct mdoc_argv *v, int *pos, char *buf)
 807 {
 808         int              c, ppos;
 809         char            *p;
 810
 811         ppos = *pos;
 812
 813         c = args(mdoc, line, pos, buf, ARGS_QUOTED, &p);
 814         if (ARGS_ERROR == c)
 815                 return(0);
 816         if (ARGS_EOLN == c)
 817                 return(perr(mdoc, line, ppos, EARGVAL));
 818
 819         v->sz = 1;
 820         v->value = xcalloc(1, sizeof(char *));
 821         v->value[0] = xstrdup(p);
 822         return(1);
 823 }
 824
 825
 826 /*
 827  * Determine rules for parsing arguments.  Arguments can either accept
 828  * no parameters, an optional single parameter, one parameter, or
 829  * multiple parameters.
 830  */
 831 static int
 832 argv(struct mdoc *mdoc, int line,
 833                 struct mdoc_argv *v, int *pos, char *buf)
 834 {
 835
 836         v->sz = 0;
 837         v->value = NULL;
 838
 839         switch (mdoc_argvflags[v->arg]) {
 840         case (ARGV_SINGLE):
 841                 return(argv_single(mdoc, line, v, pos, buf));
 842         case (ARGV_MULTI):
 843                 return(argv_multi(mdoc, line, v, pos, buf));
 844         case (ARGV_OPT_SINGLE):
 845                 return(argv_opt_single(mdoc, line, v, pos, buf));
 846         default:
 847                 /* ARGV_NONE */
 848                 break;
 849         }
 850
 851         return(1);
 852 }