mdoc_argv.c

   1 /*      $Id: mdoc_argv.c,v 1.8 2009/06/17 14:10:09 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 /* FIXME .Bf Li raises "macro-like parameter". */
  36 /* FIXME .Bl -column should deprecate old-groff syntax. */
  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         EMALLOC,
  60         EARGVAL
  61 };
  62
  63 static  int              argv_a2arg(int, const char *);
  64 static  int              args(struct mdoc *, int, int *,
  65                                 char *, int, char **);
  66 static  int              argv(struct mdoc *, int,
  67                                 struct mdoc_argv *, int *, char *);
  68 static  int              argv_single(struct mdoc *, int,
  69                                 struct mdoc_argv *, int *, char *);
  70 static  int              argv_opt_single(struct mdoc *, int,
  71                                 struct mdoc_argv *, int *, char *);
  72 static  int              argv_multi(struct mdoc *, int,
  73                                 struct mdoc_argv *, int *, char *);
  74 static  int              pwarn(struct mdoc *, int, int, enum mwarn);
  75 static  int              perr(struct mdoc *, int, int, enum merr);
  76
  77 #define verr(m, t) perr((m), (m)->last->line, (m)->last->pos, (t))
  78
  79 /* Per-argument flags. */
  80
  81 static  int mdoc_argvflags[MDOC_ARG_MAX] = {
  82         ARGV_NONE,      /* MDOC_Split */
  83         ARGV_NONE,      /* MDOC_Nosplit */
  84         ARGV_NONE,      /* MDOC_Ragged */
  85         ARGV_NONE,      /* MDOC_Unfilled */
  86         ARGV_NONE,      /* MDOC_Literal */
  87         ARGV_NONE,      /* MDOC_File */
  88         ARGV_SINGLE,    /* MDOC_Offset */
  89         ARGV_NONE,      /* MDOC_Bullet */
  90         ARGV_NONE,      /* MDOC_Dash */
  91         ARGV_NONE,      /* MDOC_Hyphen */
  92         ARGV_NONE,      /* MDOC_Item */
  93         ARGV_NONE,      /* MDOC_Enum */
  94         ARGV_NONE,      /* MDOC_Tag */
  95         ARGV_NONE,      /* MDOC_Diag */
  96         ARGV_NONE,      /* MDOC_Hang */
  97         ARGV_NONE,      /* MDOC_Ohang */
  98         ARGV_NONE,      /* MDOC_Inset */
  99         ARGV_MULTI,     /* MDOC_Column */
 100         ARGV_SINGLE,    /* MDOC_Width */
 101         ARGV_NONE,      /* MDOC_Compact */
 102         ARGV_OPT_SINGLE, /* MDOC_Std */
 103         ARGV_NONE,      /* MDOC_Filled */
 104         ARGV_NONE,      /* MDOC_Words */
 105         ARGV_NONE,      /* MDOC_Emphasis */
 106         ARGV_NONE,      /* MDOC_Symbolic */
 107         ARGV_NONE       /* MDOC_Symbolic */
 108 };
 109
 110 static  int mdoc_argflags[MDOC_MAX] = {
 111         0, /* Ap */
 112         0, /* Dd */
 113         0, /* Dt */
 114         0, /* Os */
 115         ARGS_QUOTED, /* Sh */
 116         ARGS_QUOTED, /* Ss */
 117         ARGS_DELIM, /* Pp */
 118         ARGS_DELIM, /* D1 */
 119         ARGS_DELIM | ARGS_QUOTED, /* Dl */
 120         0, /* Bd */
 121         0, /* Ed */
 122         ARGS_QUOTED, /* Bl */
 123         0, /* El */
 124         0, /* It */
 125         ARGS_DELIM, /* Ad */
 126         ARGS_DELIM, /* An */
 127         ARGS_DELIM | ARGS_QUOTED, /* Ar */
 128         ARGS_QUOTED, /* Cd */
 129         ARGS_DELIM, /* Cm */
 130         ARGS_DELIM, /* Dv */
 131         ARGS_DELIM, /* Er */
 132         ARGS_DELIM, /* Ev */
 133         0, /* Ex */
 134         ARGS_DELIM | ARGS_QUOTED, /* Fa */
 135         0, /* Fd */
 136         ARGS_DELIM, /* Fl */
 137         ARGS_DELIM | ARGS_QUOTED, /* Fn */
 138         ARGS_DELIM | ARGS_QUOTED, /* Ft */
 139         ARGS_DELIM, /* Ic */
 140         0, /* In */
 141         ARGS_DELIM | ARGS_QUOTED, /* Li */
 142         ARGS_QUOTED, /* Nd */
 143         ARGS_DELIM, /* Nm */
 144         ARGS_DELIM, /* Op */
 145         0, /* Ot */
 146         ARGS_DELIM, /* Pa */
 147         0, /* Rv */
 148         ARGS_DELIM | ARGS_ARGVLIKE, /* St */
 149         ARGS_DELIM, /* Va */
 150         ARGS_DELIM, /* Vt */
 151         ARGS_DELIM, /* Xr */
 152         ARGS_QUOTED, /* %A */
 153         ARGS_QUOTED, /* %B */
 154         ARGS_QUOTED, /* %D */
 155         ARGS_QUOTED, /* %I */
 156         ARGS_QUOTED, /* %J */
 157         ARGS_QUOTED, /* %N */
 158         ARGS_QUOTED, /* %O */
 159         ARGS_QUOTED, /* %P */
 160         ARGS_QUOTED, /* %R */
 161         ARGS_QUOTED, /* %T */
 162         ARGS_QUOTED, /* %V */
 163         ARGS_DELIM, /* Ac */
 164         0, /* Ao */
 165         ARGS_DELIM, /* Aq */
 166         ARGS_DELIM, /* At */
 167         ARGS_DELIM, /* Bc */
 168         0, /* Bf */
 169         0, /* Bo */
 170         ARGS_DELIM, /* Bq */
 171         ARGS_DELIM, /* Bsx */
 172         ARGS_DELIM, /* Bx */
 173         0, /* Db */
 174         ARGS_DELIM, /* Dc */
 175         0, /* Do */
 176         ARGS_DELIM, /* Dq */
 177         ARGS_DELIM, /* Ec */
 178         0, /* Ef */
 179         ARGS_DELIM, /* Em */
 180         0, /* Eo */
 181         ARGS_DELIM, /* Fx */
 182         ARGS_DELIM, /* Ms */
 183         ARGS_DELIM, /* No */
 184         ARGS_DELIM, /* Ns */
 185         ARGS_DELIM, /* Nx */
 186         ARGS_DELIM, /* Ox */
 187         ARGS_DELIM, /* Pc */
 188         ARGS_DELIM, /* Pf */
 189         0, /* Po */
 190         ARGS_DELIM, /* Pq */
 191         ARGS_DELIM, /* Qc */
 192         ARGS_DELIM, /* Ql */
 193         0, /* Qo */
 194         ARGS_DELIM, /* Qq */
 195         0, /* Re */
 196         0, /* Rs */
 197         ARGS_DELIM, /* Sc */
 198         0, /* So */
 199         ARGS_DELIM, /* Sq */
 200         0, /* Sm */
 201         ARGS_DELIM, /* Sx */
 202         ARGS_DELIM | ARGS_QUOTED, /* Sy */
 203         ARGS_DELIM, /* Tn */
 204         ARGS_DELIM, /* Ux */
 205         ARGS_DELIM, /* Xc */
 206         0, /* Xo */
 207         ARGS_QUOTED, /* Fo */
 208         0, /* Fc */
 209         0, /* Oo */
 210         ARGS_DELIM, /* Oc */
 211         0, /* Bk */
 212         0, /* Ek */
 213         0, /* Bt */
 214         0, /* Hf */
 215         0, /* Fr */
 216         0, /* Ud */
 217         0, /* Lb */
 218         ARGS_DELIM, /* Lp */
 219         ARGS_DELIM | ARGS_QUOTED, /* Lk */
 220         ARGS_DELIM | ARGS_QUOTED, /* Mt */
 221         ARGS_DELIM, /* Brq */
 222         0, /* Bro */
 223         ARGS_DELIM, /* Brc */
 224         ARGS_QUOTED, /* %C */
 225         0, /* Es */
 226         0, /* En */
 227         0, /* Dx */
 228         ARGS_QUOTED, /* %Q */
 229 };
 230
 231
 232 /*
 233  * Parse an argument from line text.  This comes in the form of -key
 234  * [value0...], which may either have a single mandatory value, at least
 235  * one mandatory value, an optional single value, or no value.
 236  */
 237 int
 238 mdoc_argv(struct mdoc *mdoc, int line, int tok,
 239                 struct mdoc_arg **v, int *pos, char *buf)
 240 {
 241         int               i;
 242         char             *p, sv;
 243         struct mdoc_argv tmp;
 244         struct mdoc_arg  *arg;
 245
 246         if (0 == buf[*pos])
 247                 return(ARGV_EOLN);
 248
 249         assert(' ' != buf[*pos]);
 250
 251         if ('-' != buf[*pos] || ARGS_ARGVLIKE & mdoc_argflags[tok])
 252                 return(ARGV_WORD);
 253
 254         /* Parse through to the first unescaped space. */
 255
 256         i = *pos;
 257         p = &buf[++(*pos)];
 258
 259         assert(*pos > 0);
 260
 261         /* LINTED */
 262         while (buf[*pos]) {
 263                 if (' ' == buf[*pos])
 264                         if ('\\' != buf[*pos - 1])
 265                                 break;
 266                 (*pos)++;
 267         }
 268
 269         /* XXX - save zeroed byte, if not an argument. */
 270
 271         sv = 0;
 272         if (buf[*pos]) {
 273                 sv = buf[*pos];
 274                 buf[(*pos)++] = 0;
 275         }
 276
 277         (void)memset(&tmp, 0, sizeof(struct mdoc_argv));
 278         tmp.line = line;
 279         tmp.pos = *pos;
 280
 281         /* See if our token accepts the argument. */
 282
 283         if (MDOC_ARG_MAX == (tmp.arg = argv_a2arg(tok, p))) {
 284                 /* XXX - restore saved zeroed byte. */
 285                 if (sv)
 286                         buf[*pos - 1] = sv;
 287                 if ( ! pwarn(mdoc, line, i, WARGVPARM))
 288                         return(ARGV_ERROR);
 289                 return(ARGV_WORD);
 290         }
 291
 292         while (buf[*pos] && ' ' == buf[*pos])
 293                 (*pos)++;
 294
 295         if ( ! argv(mdoc, line, &tmp, pos, buf))
 296                 return(ARGV_ERROR);
 297
 298         if (NULL == (arg = *v)) {
 299                 *v = calloc(1, sizeof(struct mdoc_arg));
 300                 if (NULL == *v) {
 301                         (void)verr(mdoc, EMALLOC);
 302                         return(ARGV_ERROR);
 303                 }
 304                 arg = *v;
 305         }
 306
 307         arg->argc++;
 308         arg->argv = realloc(arg->argv, arg->argc *
 309                         sizeof(struct mdoc_argv));
 310
 311         if (NULL == arg->argv) {
 312                 (void)verr(mdoc, EMALLOC);
 313                 return(ARGV_ERROR);
 314         }
 315
 316         (void)memcpy(&arg->argv[(int)arg->argc - 1],
 317                         &tmp, sizeof(struct mdoc_argv));
 318
 319         return(ARGV_ARG);
 320 }
 321
 322
 323 void
 324 mdoc_argv_free(struct mdoc_arg *p)
 325 {
 326         int              i, j;
 327
 328         if (NULL == p)
 329                 return;
 330
 331         if (p->refcnt) {
 332                 --(p->refcnt);
 333                 if (p->refcnt)
 334                         return;
 335         }
 336         assert(p->argc);
 337
 338         /* LINTED */
 339         for (i = 0; i < (int)p->argc; i++) {
 340                 if (0 == p->argv[i].sz)
 341                         continue;
 342                 /* LINTED */
 343                 for (j = 0; j < (int)p->argv[i].sz; j++)
 344                         free(p->argv[i].value[j]);
 345
 346                 free(p->argv[i].value);
 347         }
 348
 349         free(p->argv);
 350         free(p);
 351 }
 352
 353
 354
 355 static int
 356 perr(struct mdoc *mdoc, int line, int pos, enum merr code)
 357 {
 358         char            *p;
 359
 360         p = NULL;
 361         switch (code) {
 362         case (EMALLOC):
 363                 p = "memory exhausted";
 364                 break;
 365         case (EQUOTTERM):
 366                 p = "unterminated quoted parameter";
 367                 break;
 368         case (EARGVAL):
 369                 p = "argument requires a value";
 370                 break;
 371         }
 372         assert(p);
 373         return(mdoc_perr(mdoc, line, pos, p));
 374 }
 375
 376
 377 static int
 378 pwarn(struct mdoc *mdoc, int line, int pos, enum mwarn code)
 379 {
 380         char            *p;
 381         int              c;
 382
 383         p = NULL;
 384         c = WARN_SYNTAX;
 385         switch (code) {
 386         case (WQUOTPARM):
 387                 p = "unexpected quoted parameter";
 388                 break;
 389         case (WARGVPARM):
 390                 p = "argument-like parameter";
 391                 break;
 392         case (WCOLEMPTY):
 393                 p = "last list column is empty";
 394                 c = WARN_COMPAT;
 395                 break;
 396         case (WTAILWS):
 397                 p = "trailing whitespace";
 398                 c = WARN_COMPAT;
 399                 break;
 400         }
 401         assert(p);
 402         return(mdoc_pwarn(mdoc, line, pos, c, p));
 403 }
 404
 405
 406 int
 407 mdoc_args(struct mdoc *mdoc, int line,
 408                 int *pos, char *buf, int tok, char **v)
 409 {
 410         int               fl, c, i;
 411         struct mdoc_node *n;
 412
 413         fl = (0 == tok) ? 0 : mdoc_argflags[tok];
 414
 415         /*
 416          * Override per-macro argument flags with context-specific ones.
 417          * As of now, this is only valid for `It' depending on its list
 418          * context.
 419          */
 420
 421         switch (tok) {
 422         case (MDOC_It):
 423                 for (n = mdoc->last; n; n = n->parent)
 424                         if (MDOC_BLOCK == n->type && MDOC_Bl == n->tok)
 425                                 break;
 426
 427                 assert(n);
 428                 c = (int)(n->args ? n->args->argc : 0);
 429                 assert(c > 0);
 430
 431                 /*
 432                  * Using `Bl -column' adds ARGS_TABSEP to the arguments
 433                  * and invalidates ARGS_DELIM.  Using `Bl -diag' allows
 434                  * for quoted arguments.
 435                  */
 436
 437                 /* LINTED */
 438                 for (i = 0; i < c; i++) {
 439                         switch (n->args->argv[i].arg) {
 440                         case (MDOC_Column):
 441                                 fl |= ARGS_TABSEP;
 442                                 fl &= ~ARGS_DELIM;
 443                                 i = c;
 444                                 break;
 445                         case (MDOC_Diag):
 446                                 fl |= ARGS_QUOTED;
 447                                 i = c;
 448                                 break;
 449                         default:
 450                                 break;
 451                         }
 452                 }
 453                 break;
 454         default:
 455                 break;
 456         }
 457
 458         return(args(mdoc, line, pos, buf, fl, v));
 459 }
 460
 461
 462 static int
 463 args(struct mdoc *mdoc, int line,
 464                 int *pos, char *buf, int fl, char **v)
 465 {
 466         int               i;
 467         char             *p, *pp;
 468
 469         assert(*pos > 0);
 470
 471         if (0 == buf[*pos])
 472                 return(ARGS_EOLN);
 473
 474         if ('\"' == buf[*pos] && ! (fl & ARGS_QUOTED))
 475                 if ( ! pwarn(mdoc, line, *pos, WQUOTPARM))
 476                         return(ARGS_ERROR);
 477
 478         if ( ! (fl & ARGS_ARGVLIKE) && '-' == buf[*pos])
 479                 if ( ! pwarn(mdoc, line, *pos, WARGVPARM))
 480                         return(ARGS_ERROR);
 481
 482         /*
 483          * If the first character is a delimiter and we're to look for
 484          * delimited strings, then pass down the buffer seeing if it
 485          * follows the pattern of [[::delim::][ ]+]+.
 486          */
 487
 488         if ((fl & ARGS_DELIM) && mdoc_iscdelim(buf[*pos])) {
 489                 for (i = *pos; buf[i]; ) {
 490                         if ( ! mdoc_iscdelim(buf[i]))
 491                                 break;
 492                         i++;
 493                         /* There must be at least one space... */
 494                         if (0 == buf[i] || ' ' != buf[i])
 495                                 break;
 496                         i++;
 497                         while (buf[i] && ' ' == buf[i])
 498                                 i++;
 499                 }
 500                 if (0 == buf[i]) {
 501                         *v = &buf[*pos];
 502                         return(ARGS_PUNCT);
 503                 }
 504         }
 505
 506         /* First parse non-quoted strings. */
 507
 508         if ('\"' != buf[*pos] || ! (ARGS_QUOTED & fl)) {
 509                 *v = &buf[*pos];
 510
 511                 /*
 512                  * Thar be dragons here!  If we're tab-separated, search
 513                  * ahead for either a tab or the `Ta' macro.
 514                  * If a `Ta' is detected, it must be space-buffered before and
 515                  * after.  If either of these hold true, then prune out the
 516                  * extra spaces and call it an argument.
 517                  */
 518
 519                 if (ARGS_TABSEP & fl) {
 520                         /* Scan ahead to unescaped tab. */
 521
 522                         p = strchr(*v, '\t');
 523
 524                         /* Scan ahead to unescaped `Ta'. */
 525
 526                         for (pp = *v; ; pp++) {
 527                                 if (NULL == (pp = strstr(pp, "Ta")))
 528                                         break;
 529                                 if (pp > *v && ' ' != *(pp - 1))
 530                                         continue;
 531                                 if (' ' == *(pp + 2) || 0 == *(pp + 2))
 532                                         break;
 533                         }
 534
 535                         /* Choose delimiter tab/Ta. */
 536
 537                         if (p && pp)
 538                                 p = (p < pp ? p : pp);
 539                         else if ( ! p && pp)
 540                                 p = pp;
 541
 542                         /* Strip delimiter's preceding whitespace. */
 543
 544                         if (p && p > *v) {
 545                                 pp = p - 1;
 546                                 while (pp > *v && ' ' == *pp)
 547                                         pp--;
 548                                 if (pp == *v && ' ' == *pp)
 549                                         *pp = 0;
 550                                 else if (' ' == *pp)
 551                                         *(pp + 1) = 0;
 552                         }
 553
 554                         /* ...in- and proceding whitespace. */
 555
 556                         if (p && ('\t' != *p)) {
 557                                 *p++ = 0;
 558                                 *p++ = 0;
 559                         } else if (p)
 560                                 *p++ = 0;
 561
 562                         if (p) {
 563                                 while (' ' == *p)
 564                                         p++;
 565                                 if (0 != *p)
 566                                         *(p - 1) = 0;
 567                                 *pos += (int)(p - *v);
 568                         }
 569
 570                         if (p && 0 == *p)
 571                                 if ( ! pwarn(mdoc, line, *pos, WCOLEMPTY))
 572                                         return(0);
 573                         if (p && 0 == *p && p > *v && ' ' == *(p - 1))
 574                                 if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 575                                         return(0);
 576
 577                         if (p)
 578                                 return(ARGS_PHRASE);
 579
 580                         /* Configure the eoln case, too. */
 581
 582                         p = strchr(*v, 0);
 583                         assert(p);
 584
 585                         if (p > *v && ' ' == *(p - 1))
 586                                 if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 587                                         return(0);
 588                         *pos += (int)(p - *v);
 589
 590                         return(ARGS_PHRASE);
 591                 }
 592
 593                 /* Do non-tabsep look-ahead here. */
 594
 595                 if ( ! (ARGS_TABSEP & fl))
 596                         while (buf[*pos]) {
 597                                 if (' ' == buf[*pos])
 598                                         if ('\\' != buf[*pos - 1])
 599                                                 break;
 600                                 (*pos)++;
 601                         }
 602
 603                 if (0 == buf[*pos])
 604                         return(ARGS_WORD);
 605
 606                 buf[(*pos)++] = 0;
 607
 608                 if (0 == buf[*pos])
 609                         return(ARGS_WORD);
 610
 611                 if ( ! (ARGS_TABSEP & fl))
 612                         while (buf[*pos] && ' ' == buf[*pos])
 613                                 (*pos)++;
 614
 615                 if (buf[*pos])
 616                         return(ARGS_WORD);
 617
 618                 if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 619                         return(ARGS_ERROR);
 620
 621                 return(ARGS_WORD);
 622         }
 623
 624         /*
 625          * If we're a quoted string (and quoted strings are allowed),
 626          * then parse ahead to the next quote.  If none's found, it's an
 627          * error.  After, parse to the next word.
 628          */
 629
 630         *v = &buf[++(*pos)];
 631
 632         while (buf[*pos] && '\"' != buf[*pos])
 633                 (*pos)++;
 634
 635         if (0 == buf[*pos]) {
 636                 (void)perr(mdoc, line, *pos, EQUOTTERM);
 637                 return(ARGS_ERROR);
 638         }
 639
 640         buf[(*pos)++] = 0;
 641         if (0 == buf[*pos])
 642                 return(ARGS_QWORD);
 643
 644         while (buf[*pos] && ' ' == buf[*pos])
 645                 (*pos)++;
 646
 647         if (buf[*pos])
 648                 return(ARGS_QWORD);
 649
 650         if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 651                 return(ARGS_ERROR);
 652
 653         return(ARGS_QWORD);
 654 }
 655
 656
 657 static int
 658 argv_a2arg(int tok, const char *argv)
 659 {
 660
 661         /*
 662          * Parse an argument identifier from its text.  XXX - this
 663          * should really be table-driven to clarify the code.
 664          *
 665          * If you add an argument to the list, make sure that you
 666          * register it here with its one or more macros!
 667          */
 668
 669         switch (tok) {
 670         case (MDOC_An):
 671                 if (0 == strcmp(argv, "split"))
 672                         return(MDOC_Split);
 673                 else if (0 == strcmp(argv, "nosplit"))
 674                         return(MDOC_Nosplit);
 675                 break;
 676
 677         case (MDOC_Bd):
 678                 if (0 == strcmp(argv, "ragged"))
 679                         return(MDOC_Ragged);
 680                 else if (0 == strcmp(argv, "unfilled"))
 681                         return(MDOC_Unfilled);
 682                 else if (0 == strcmp(argv, "filled"))
 683                         return(MDOC_Filled);
 684                 else if (0 == strcmp(argv, "literal"))
 685                         return(MDOC_Literal);
 686                 else if (0 == strcmp(argv, "file"))
 687                         return(MDOC_File);
 688                 else if (0 == strcmp(argv, "offset"))
 689                         return(MDOC_Offset);
 690                 else if (0 == strcmp(argv, "compact"))
 691                         return(MDOC_Compact);
 692                 break;
 693
 694         case (MDOC_Bf):
 695                 if (0 == strcmp(argv, "emphasis"))
 696                         return(MDOC_Emphasis);
 697                 else if (0 == strcmp(argv, "literal"))
 698                         return(MDOC_Literal);
 699                 else if (0 == strcmp(argv, "symbolic"))
 700                         return(MDOC_Symbolic);
 701                 break;
 702
 703         case (MDOC_Bk):
 704                 if (0 == strcmp(argv, "words"))
 705                         return(MDOC_Words);
 706                 break;
 707
 708         case (MDOC_Bl):
 709                 if (0 == strcmp(argv, "bullet"))
 710                         return(MDOC_Bullet);
 711                 else if (0 == strcmp(argv, "dash"))
 712                         return(MDOC_Dash);
 713                 else if (0 == strcmp(argv, "hyphen"))
 714                         return(MDOC_Hyphen);
 715                 else if (0 == strcmp(argv, "item"))
 716                         return(MDOC_Item);
 717                 else if (0 == strcmp(argv, "enum"))
 718                         return(MDOC_Enum);
 719                 else if (0 == strcmp(argv, "tag"))
 720                         return(MDOC_Tag);
 721                 else if (0 == strcmp(argv, "diag"))
 722                         return(MDOC_Diag);
 723                 else if (0 == strcmp(argv, "hang"))
 724                         return(MDOC_Hang);
 725                 else if (0 == strcmp(argv, "ohang"))
 726                         return(MDOC_Ohang);
 727                 else if (0 == strcmp(argv, "inset"))
 728                         return(MDOC_Inset);
 729                 else if (0 == strcmp(argv, "column"))
 730                         return(MDOC_Column);
 731                 else if (0 == strcmp(argv, "width"))
 732                         return(MDOC_Width);
 733                 else if (0 == strcmp(argv, "offset"))
 734                         return(MDOC_Offset);
 735                 else if (0 == strcmp(argv, "compact"))
 736                         return(MDOC_Compact);
 737                 else if (0 == strcmp(argv, "nested"))
 738                         return(MDOC_Nested);
 739                 break;
 740
 741         case (MDOC_Rv):
 742                 /* FALLTHROUGH */
 743         case (MDOC_Ex):
 744                 if (0 == strcmp(argv, "std"))
 745                         return(MDOC_Std);
 746                 break;
 747         default:
 748                 break;
 749         }
 750
 751         return(MDOC_ARG_MAX);
 752 }
 753
 754
 755 static int
 756 argv_multi(struct mdoc *mdoc, int line,
 757                 struct mdoc_argv *v, int *pos, char *buf)
 758 {
 759         int              c;
 760         char            *p;
 761
 762         for (v->sz = 0; ; v->sz++) {
 763                 if ('-' == buf[*pos])
 764                         break;
 765                 c = args(mdoc, line, pos, buf, ARGS_QUOTED, &p);
 766                 if (ARGS_ERROR == c)
 767                         return(0);
 768                 else if (ARGS_EOLN == c)
 769                         break;
 770
 771                 if (0 == v->sz % MULTI_STEP) {
 772                         v->value = realloc(v->value,
 773                                 (v->sz + MULTI_STEP) * sizeof(char *));
 774                         if (NULL == v->value) {
 775                                 (void)verr(mdoc, EMALLOC);
 776                                 return(ARGV_ERROR);
 777                         }
 778                 }
 779                 if (NULL == (v->value[(int)v->sz] = strdup(p)))
 780                         return(verr(mdoc, EMALLOC));
 781         }
 782
 783         return(1);
 784 }
 785
 786
 787 static int
 788 argv_opt_single(struct mdoc *mdoc, int line,
 789                 struct mdoc_argv *v, int *pos, char *buf)
 790 {
 791         int              c;
 792         char            *p;
 793
 794         if ('-' == buf[*pos])
 795                 return(1);
 796
 797         c = args(mdoc, line, pos, buf, ARGS_QUOTED, &p);
 798         if (ARGS_ERROR == c)
 799                 return(0);
 800         if (ARGS_EOLN == c)
 801                 return(1);
 802
 803         v->sz = 1;
 804         if (NULL == (v->value = calloc(1, sizeof(char *))))
 805                 return(verr(mdoc, EMALLOC));
 806         if (NULL == (v->value[0] = strdup(p)))
 807                 return(verr(mdoc, EMALLOC));
 808
 809         return(1);
 810 }
 811
 812
 813 /*
 814  * Parse a single, mandatory value from the stream.
 815  */
 816 static int
 817 argv_single(struct mdoc *mdoc, int line,
 818                 struct mdoc_argv *v, int *pos, char *buf)
 819 {
 820         int              c, ppos;
 821         char            *p;
 822
 823         ppos = *pos;
 824
 825         c = args(mdoc, line, pos, buf, ARGS_QUOTED, &p);
 826         if (ARGS_ERROR == c)
 827                 return(0);
 828         if (ARGS_EOLN == c)
 829                 return(perr(mdoc, line, ppos, EARGVAL));
 830
 831         v->sz = 1;
 832         if (NULL == (v->value = calloc(1, sizeof(char *))))
 833                 return(verr(mdoc, EMALLOC));
 834         if (NULL == (v->value[0] = strdup(p)))
 835                 return(verr(mdoc, EMALLOC));
 836
 837         return(1);
 838 }
 839
 840
 841 /*
 842  * Determine rules for parsing arguments.  Arguments can either accept
 843  * no parameters, an optional single parameter, one parameter, or
 844  * multiple parameters.
 845  */
 846 static int
 847 argv(struct mdoc *mdoc, int line,
 848                 struct mdoc_argv *v, int *pos, char *buf)
 849 {
 850
 851         v->sz = 0;
 852         v->value = NULL;
 853
 854         switch (mdoc_argvflags[v->arg]) {
 855         case (ARGV_SINGLE):
 856                 return(argv_single(mdoc, line, v, pos, buf));
 857         case (ARGV_MULTI):
 858                 return(argv_multi(mdoc, line, v, pos, buf));
 859         case (ARGV_OPT_SINGLE):
 860                 return(argv_opt_single(mdoc, line, v, pos, buf));
 861         default:
 862                 /* ARGV_NONE */
 863                 break;
 864         }
 865
 866         return(1);
 867 }