argv.c

   1 /* $Id: argv.c,v 1.39 2009/03/08 11:41:22 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008 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
   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 <assert.h>
  20 #include <ctype.h>
  21 #include <err.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25
  26 #include "private.h"
  27
  28 /*
  29  * Routines to parse arguments of macros.  Arguments follow the syntax
  30  * of `-arg [val [valN...]]'.  Arguments come in all types:  quoted
  31  * arguments, multiple arguments per value, no-value arguments, etc.
  32  *
  33  * There's no limit to the number or arguments that may be allocated.
  34  */
  35
  36 #define ARGS_QUOTED     (1 << 0)
  37 #define ARGS_DELIM      (1 << 1)
  38 #define ARGS_TABSEP     (1 << 2)
  39 #define ARGS_ARGVLIKE   (1 << 3)
  40
  41 #define ARGV_NONE       (1 << 0)
  42 #define ARGV_SINGLE     (1 << 1)
  43 #define ARGV_MULTI      (1 << 2)
  44 #define ARGV_OPT_SINGLE (1 << 3)
  45
  46 enum    mwarn {
  47         WQUOTPARM,
  48         WARGVPARM,
  49         WCOLEMPTY,
  50         WTAILWS
  51 };
  52
  53 enum    merr {
  54         EQUOTTERM,
  55         EARGVAL
  56 };
  57
  58 static  int              argv_a2arg(int, const char *);
  59 static  int              args(struct mdoc *, int, int *,
  60                                 char *, int, char **);
  61 static  int              argv(struct mdoc *, int, int,
  62                                 struct mdoc_argv *, int *, char *);
  63 static  int              argv_single(struct mdoc *, int,
  64                                 struct mdoc_argv *, int *, char *);
  65 static  int              argv_opt_single(struct mdoc *, int,
  66                                 struct mdoc_argv *, int *, char *);
  67 static  int              argv_multi(struct mdoc *, int,
  68                                 struct mdoc_argv *, int *, char *);
  69 static  int              pwarn(struct mdoc *, int, int, enum mwarn);
  70 static  int              perr(struct mdoc *, int, int, enum merr);
  71
  72 /* Per-argument flags. */
  73
  74 static  int mdoc_argvflags[MDOC_ARG_MAX] = {
  75         ARGV_NONE,      /* MDOC_Split */
  76         ARGV_NONE,      /* MDOC_Nosplit */
  77         ARGV_NONE,      /* MDOC_Ragged */
  78         ARGV_NONE,      /* MDOC_Unfilled */
  79         ARGV_NONE,      /* MDOC_Literal */
  80         ARGV_NONE,      /* MDOC_File */
  81         ARGV_SINGLE,    /* MDOC_Offset */
  82         ARGV_NONE,      /* MDOC_Bullet */
  83         ARGV_NONE,      /* MDOC_Dash */
  84         ARGV_NONE,      /* MDOC_Hyphen */
  85         ARGV_NONE,      /* MDOC_Item */
  86         ARGV_NONE,      /* MDOC_Enum */
  87         ARGV_NONE,      /* MDOC_Tag */
  88         ARGV_NONE,      /* MDOC_Diag */
  89         ARGV_NONE,      /* MDOC_Hang */
  90         ARGV_NONE,      /* MDOC_Ohang */
  91         ARGV_NONE,      /* MDOC_Inset */
  92         ARGV_MULTI,     /* MDOC_Column */
  93         ARGV_SINGLE,    /* MDOC_Width */
  94         ARGV_NONE,      /* MDOC_Compact */
  95         ARGV_SINGLE,    /* MDOC_Std */
  96         ARGV_NONE,      /* MDOC_Filled */
  97         ARGV_NONE,      /* MDOC_Words */
  98         ARGV_NONE,      /* MDOC_Emphasis */
  99         ARGV_NONE       /* MDOC_Symbolic */
 100 };
 101
 102 static  int mdoc_argflags[MDOC_MAX] = {
 103         0, /* \" */
 104         0, /* Dd */
 105         0, /* Dt */
 106         0, /* Os */
 107         0, /* Sh */
 108         0, /* Ss */
 109         ARGS_DELIM, /* Pp */
 110         ARGS_DELIM, /* D1 */
 111         ARGS_DELIM, /* Dl */
 112         0, /* Bd */
 113         0, /* Ed */
 114         0, /* Bl */
 115         0, /* El */
 116         0, /* It */
 117         ARGS_DELIM, /* Ad */
 118         ARGS_DELIM, /* An */
 119         ARGS_DELIM, /* Ar */
 120         ARGS_QUOTED, /* Cd */
 121         ARGS_DELIM, /* Cm */
 122         ARGS_DELIM, /* Dv */
 123         ARGS_DELIM, /* Er */
 124         ARGS_DELIM, /* Ev */
 125         0, /* Ex */
 126         ARGS_DELIM | ARGS_QUOTED, /* Fa */
 127         0, /* Fd */
 128         ARGS_DELIM, /* Fl */
 129         ARGS_DELIM | ARGS_QUOTED, /* Fn */
 130         ARGS_DELIM | ARGS_QUOTED, /* Ft */
 131         ARGS_DELIM, /* Ic */
 132         0, /* In */
 133         ARGS_DELIM, /* Li */
 134         0, /* Nd */
 135         ARGS_DELIM, /* Nm */
 136         ARGS_DELIM, /* Op */
 137         0, /* Ot */
 138         ARGS_DELIM, /* Pa */
 139         0, /* Rv */
 140         ARGS_DELIM | ARGS_ARGVLIKE, /* St */
 141         ARGS_DELIM, /* Va */
 142         ARGS_DELIM, /* Vt */
 143         ARGS_DELIM, /* Xr */
 144         ARGS_QUOTED, /* %A */
 145         ARGS_QUOTED, /* %B */
 146         ARGS_QUOTED, /* %D */
 147         ARGS_QUOTED, /* %I */
 148         ARGS_QUOTED, /* %J */
 149         ARGS_QUOTED, /* %N */
 150         ARGS_QUOTED, /* %O */
 151         ARGS_QUOTED, /* %P */
 152         ARGS_QUOTED, /* %R */
 153         ARGS_QUOTED, /* %T */
 154         ARGS_QUOTED, /* %V */
 155         ARGS_DELIM, /* Ac */
 156         0, /* Ao */
 157         ARGS_DELIM, /* Aq */
 158         ARGS_DELIM, /* At */
 159         ARGS_DELIM, /* Bc */
 160         0, /* Bf */
 161         0, /* Bo */
 162         ARGS_DELIM, /* Bq */
 163         ARGS_DELIM, /* Bsx */
 164         ARGS_DELIM, /* Bx */
 165         0, /* Db */
 166         ARGS_DELIM, /* Dc */
 167         0, /* Do */
 168         ARGS_DELIM, /* Dq */
 169         ARGS_DELIM, /* Ec */
 170         0, /* Ef */
 171         ARGS_DELIM, /* Em */
 172         0, /* Eo */
 173         ARGS_DELIM, /* Fx */
 174         ARGS_DELIM, /* Ms */
 175         ARGS_DELIM, /* No */
 176         ARGS_DELIM, /* Ns */
 177         ARGS_DELIM, /* Nx */
 178         ARGS_DELIM, /* Ox */
 179         ARGS_DELIM, /* Pc */
 180         ARGS_DELIM, /* Pf */
 181         0, /* Po */
 182         ARGS_DELIM, /* Pq */
 183         ARGS_DELIM, /* Qc */
 184         ARGS_DELIM, /* Ql */
 185         0, /* Qo */
 186         ARGS_DELIM, /* Qq */
 187         0, /* Re */
 188         0, /* Rs */
 189         ARGS_DELIM, /* Sc */
 190         0, /* So */
 191         ARGS_DELIM, /* Sq */
 192         0, /* Sm */
 193         ARGS_DELIM, /* Sx */
 194         ARGS_DELIM, /* Sy */
 195         ARGS_DELIM, /* Tn */
 196         ARGS_DELIM, /* Ux */
 197         ARGS_DELIM, /* Xc */
 198         0, /* Xo */
 199         0, /* Fo */
 200         0, /* Fc */
 201         0, /* Oo */
 202         ARGS_DELIM, /* Oc */
 203         0, /* Bk */
 204         0, /* Ek */
 205         0, /* Bt */
 206         0, /* Hf */
 207         0, /* Fr */
 208         0, /* Ud */
 209         0, /* Lb */
 210 };
 211
 212
 213 /*
 214  * Parse an argument from line text.  This comes in the form of -key
 215  * [value0...], which may either have a single mandatory value, at least
 216  * one mandatory value, an optional single value, or no value.
 217  */
 218 int
 219 mdoc_argv(struct mdoc *mdoc, int line, int tok,
 220                 struct mdoc_arg **v, int *pos, char *buf)
 221 {
 222         int               i;
 223         char             *p;
 224         struct mdoc_argv tmp;
 225         struct mdoc_arg  *arg;
 226
 227         if (0 == buf[*pos])
 228                 return(ARGV_EOLN);
 229
 230         assert( ! isspace((u_char)buf[*pos]));
 231
 232         if ('-' != buf[*pos])
 233                 return(ARGV_WORD);
 234
 235         i = *pos;
 236         p = &buf[++(*pos)];
 237
 238         assert(*pos > 0);
 239
 240         /* LINTED */
 241         while (buf[*pos]) {
 242                 if (isspace((u_char)buf[*pos]))
 243                         if ('\\' != buf[*pos - 1])
 244                                 break;
 245                 (*pos)++;
 246         }
 247
 248         if (buf[*pos])
 249                 buf[(*pos)++] = 0;
 250
 251         (void)memset(&tmp, 0, sizeof(struct mdoc_argv));
 252         tmp.line = line;
 253         tmp.pos = *pos;
 254
 255         /*
 256          * We now parse out the per-macro arguments.  XXX - this can be
 257          * made much cleaner using per-argument tables.  See argv_a2arg
 258          * for details.
 259          */
 260
 261         if (MDOC_ARG_MAX == (tmp.arg = argv_a2arg(tok, p))) {
 262                 if ( ! pwarn(mdoc, line, i, WARGVPARM))
 263                         return(ARGV_ERROR);
 264                 return(ARGV_WORD);
 265         }
 266
 267         while (buf[*pos] && isspace((u_char)buf[*pos]))
 268                 (*pos)++;
 269
 270         /* FIXME: whitespace if no value. */
 271
 272         if ( ! argv(mdoc, tok, line, &tmp, pos, buf))
 273                 return(ARGV_ERROR);
 274
 275         if (NULL == (arg = *v)) {
 276                 v = xcalloc(1, sizeof(struct mdoc_arg));
 277                 arg = *v;
 278         }
 279
 280         arg->argc++;
 281         arg->argv = xrealloc(arg->argv, arg->argc *
 282                         sizeof(struct mdoc_arg));
 283
 284         (void)memcpy(&arg->argv[(int)arg->argc - 1],
 285                         &tmp, sizeof(struct mdoc_argv));
 286
 287         return(ARGV_ARG);
 288 }
 289
 290
 291 void
 292 mdoc_argv_free(struct mdoc_arg *p)
 293 {
 294         int              i, j;
 295
 296         if (p->refcnt && --(p->refcnt) > 0)
 297                 return;
 298
 299         /* LINTED */
 300         for (i = 0; i < (int)p->argc; i++) {
 301                 if (0 == p->argv[i].sz)
 302                         continue;
 303                 /* LINTED */
 304                 for (j = 0; j < (int)p->argv[i].sz; j++)
 305                         free(p->argv[i].value[j]);
 306                 free(p->argv[i].value);
 307         }
 308
 309         if (p->argc)
 310                 free(p->argv);
 311         free(p);
 312 }
 313
 314
 315
 316 static int
 317 perr(struct mdoc *mdoc, int line, int pos, enum merr code)
 318 {
 319         char            *p;
 320
 321         p = NULL;
 322
 323         switch (code) {
 324         case (EQUOTTERM):
 325                 p = "unterminated quoted parameter";
 326                 break;
 327         case (EARGVAL):
 328                 p = "argument requires a value";
 329                 break;
 330         }
 331
 332         assert(p);
 333         return(mdoc_perr(mdoc, line, pos, p));
 334 }
 335
 336
 337 static int
 338 pwarn(struct mdoc *mdoc, int line, int pos, enum mwarn code)
 339 {
 340         char            *p;
 341         int              c;
 342
 343         p = NULL;
 344         c = WARN_SYNTAX;
 345
 346         switch (code) {
 347         case (WQUOTPARM):
 348                 p = "unexpected quoted parameter";
 349                 break;
 350         case (WARGVPARM):
 351                 p = "argument-like parameter";
 352                 break;
 353         case (WCOLEMPTY):
 354                 p = "last list column is empty";
 355                 c = WARN_COMPAT;
 356                 break;
 357         case (WTAILWS):
 358                 p = "trailing whitespace";
 359                 c = WARN_COMPAT;
 360                 break;
 361         }
 362
 363         assert(p);
 364         return(mdoc_pwarn(mdoc, line, pos, c, p));
 365 }
 366
 367
 368 int
 369 mdoc_args(struct mdoc *mdoc, int line,
 370                 int *pos, char *buf, int tok, char **v)
 371 {
 372         int               fl, c, i;
 373         struct mdoc_node *n;
 374
 375         fl = (0 == tok) ? 0 : mdoc_argflags[tok];
 376
 377         /*
 378          * Override per-macro argument flags with context-specific ones.
 379          * As of now, this is only valid for `It' depending on its list
 380          * context.
 381          */
 382
 383         switch (tok) {
 384         case (MDOC_It):
 385                 for (n = mdoc->last; n; n = n->parent)
 386                         if (MDOC_BLOCK == n->type && MDOC_Bl == n->tok)
 387                                 break;
 388
 389                 assert(n);
 390                 c = (int)(n->args ? n->args->argc : 0);
 391                 assert(c > 0);
 392
 393                 /*
 394                  * Using `Bl -column' adds ARGS_TABSEP to the arguments
 395                  * and invalidates ARGS_DELIM.  Using `Bl -diag' allows
 396                  * for quoted arguments.
 397                  */
 398
 399                 /* LINTED */
 400                 for (i = 0; i < c; i++) {
 401                         switch (n->args->argv[i].arg) {
 402                         case (MDOC_Column):
 403                                 fl |= ARGS_TABSEP;
 404                                 fl &= ~ARGS_DELIM;
 405                                 i = c;
 406                                 break;
 407                         case (MDOC_Diag):
 408                                 fl |= ARGS_QUOTED;
 409                                 i = c;
 410                                 break;
 411                         default:
 412                                 break;
 413                         }
 414                 }
 415                 break;
 416         default:
 417                 break;
 418         }
 419
 420         /* Continue parsing the arguments themselves...  */
 421
 422         return(args(mdoc, line, pos, buf, fl, v));
 423 }
 424
 425
 426 static int
 427 args(struct mdoc *mdoc, int line,
 428                 int *pos, char *buf, int fl, char **v)
 429 {
 430         int               i;
 431         char             *p, *pp;
 432
 433         assert(*pos > 0);
 434
 435         if (0 == buf[*pos])
 436                 return(ARGS_EOLN);
 437
 438         if ('\"' == buf[*pos] && ! (fl & ARGS_QUOTED))
 439                 if ( ! pwarn(mdoc, line, *pos, WQUOTPARM))
 440                         return(ARGS_ERROR);
 441
 442         if ( ! (fl & ARGS_ARGVLIKE) && '-' == buf[*pos])
 443                 if ( ! pwarn(mdoc, line, *pos, WARGVPARM))
 444                         return(ARGS_ERROR);
 445
 446         /*
 447          * If the first character is a delimiter and we're to look for
 448          * delimited strings, then pass down the buffer seeing if it
 449          * follows the pattern of [[::delim::][ ]+]+.
 450          */
 451
 452         if ((fl & ARGS_DELIM) && mdoc_iscdelim(buf[*pos])) {
 453                 for (i = *pos; buf[i]; ) {
 454                         if ( ! mdoc_iscdelim(buf[i]))
 455                                 break;
 456                         i++;
 457                         /* There must be at least one space... */
 458                         if (0 == buf[i] || ! isspace((u_char)buf[i]))
 459                                 break;
 460                         i++;
 461                         while (buf[i] && isspace((u_char)buf[i]))
 462                                 i++;
 463                 }
 464                 if (0 == buf[i]) {
 465                         *v = &buf[*pos];
 466                         return(ARGS_PUNCT);
 467                 }
 468         }
 469
 470         /* First parse non-quoted strings. */
 471
 472         if ('\"' != buf[*pos] || ! (ARGS_QUOTED & fl)) {
 473                 *v = &buf[*pos];
 474
 475                 /*
 476                  * Thar be dragons here!  If we're tab-separated, search
 477                  * ahead for either a tab or the `Ta' macro.  If a tab
 478                  * is detected, it mustn't be escaped; if a `Ta' is
 479                  * detected, it must be space-buffered before and after.
 480                  * If either of these hold true, then prune out the
 481                  * extra spaces and call it an argument.
 482                  */
 483
 484                 if (ARGS_TABSEP & fl) {
 485                         /* Scan ahead to unescaped tab. */
 486
 487                         for (p = *v; ; p++) {
 488                                 if (NULL == (p = strchr(p, '\t')))
 489                                         break;
 490                                 if (p == *v)
 491                                         break;
 492                                 if ('\\' != *(p - 1))
 493                                         break;
 494                         }
 495
 496                         /* Scan ahead to unescaped `Ta'. */
 497
 498                         for (pp = *v; ; pp++) {
 499                                 if (NULL == (pp = strstr(pp, "Ta")))
 500                                         break;
 501                                 if (pp > *v && ' ' != *(pp - 1))
 502                                         continue;
 503                                 if (' ' == *(pp + 2) || 0 == *(pp + 2))
 504                                         break;
 505                         }
 506
 507                         /* Choose delimiter tab/Ta. */
 508
 509                         if (p && pp)
 510                                 p = (p < pp ? p : pp);
 511                         else if ( ! p && pp)
 512                                 p = pp;
 513
 514                         /* Strip delimiter's preceding whitespace. */
 515
 516                         if (p && p > *v) {
 517                                 pp = p - 1;
 518                                 while (pp > *v && ' ' == *pp)
 519                                         pp--;
 520                                 if (pp == *v && ' ' == *pp)
 521                                         *pp = 0;
 522                                 else if (' ' == *pp)
 523                                         *(pp + 1) = 0;
 524                         }
 525
 526                         /* ...in- and proceding whitespace. */
 527
 528                         if (p && ('\t' != *p)) {
 529                                 *p++ = 0;
 530                                 *p++ = 0;
 531                         } else if (p)
 532                                 *p++ = 0;
 533
 534                         if (p) {
 535                                 while (' ' == *p)
 536                                         p++;
 537                                 if (0 != *p)
 538                                         *(p - 1) = 0;
 539                                 *pos += (int)(p - *v);
 540                         }
 541
 542                         if (p && 0 == *p)
 543                                 if ( ! pwarn(mdoc, line, *pos, WCOLEMPTY))
 544                                         return(0);
 545                         if (p && 0 == *p && p > *v && ' ' == *(p - 1))
 546                                 if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 547                                         return(0);
 548
 549                         if (p)
 550                                 return(ARGS_WORD);
 551
 552                         /* Configure the eoln case, too. */
 553
 554                         p = strchr(*v, 0);
 555                         assert(p);
 556
 557                         if (p > *v && ' ' == *(p - 1))
 558                                 if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 559                                         return(0);
 560                         *pos += (int)(p - *v);
 561
 562                         return(ARGS_WORD);
 563                 }
 564
 565                 /* Do non-tabsep look-ahead here. */
 566
 567                 if ( ! (ARGS_TABSEP & fl))
 568                         while (buf[*pos]) {
 569                                 if (isspace((u_char)buf[*pos]))
 570                                         if ('\\' != buf[*pos - 1])
 571                                                 break;
 572                                 (*pos)++;
 573                         }
 574
 575                 if (0 == buf[*pos])
 576                         return(ARGS_WORD);
 577
 578                 buf[(*pos)++] = 0;
 579
 580                 if (0 == buf[*pos])
 581                         return(ARGS_WORD);
 582
 583                 if ( ! (ARGS_TABSEP & fl))
 584                         while (buf[*pos] && isspace((u_char)buf[*pos]))
 585                                 (*pos)++;
 586
 587                 if (buf[*pos])
 588                         return(ARGS_WORD);
 589
 590                 if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 591                         return(ARGS_ERROR);
 592
 593                 return(ARGS_WORD);
 594         }
 595
 596         /*
 597          * If we're a quoted string (and quoted strings are allowed),
 598          * then parse ahead to the next quote.  If none's found, it's an
 599          * error.  After, parse to the next word.
 600          */
 601
 602         *v = &buf[++(*pos)];
 603
 604         while (buf[*pos] && '\"' != buf[*pos])
 605                 (*pos)++;
 606
 607         if (0 == buf[*pos]) {
 608                 (void)perr(mdoc, line, *pos, EQUOTTERM);
 609                 return(ARGS_ERROR);
 610         }
 611
 612         buf[(*pos)++] = 0;
 613         if (0 == buf[*pos])
 614                 return(ARGS_QWORD);
 615
 616         while (buf[*pos] && isspace((u_char)buf[*pos]))
 617                 (*pos)++;
 618
 619         if (buf[*pos])
 620                 return(ARGS_QWORD);
 621
 622         if ( ! pwarn(mdoc, line, *pos, WTAILWS))
 623                 return(ARGS_ERROR);
 624
 625         return(ARGS_QWORD);
 626 }
 627
 628
 629 static int
 630 argv_a2arg(int tok, const char *argv)
 631 {
 632
 633         /*
 634          * Parse an argument identifier from its text.  XXX - this
 635          * should really be table-driven to clarify the code.
 636          *
 637          * If you add an argument to the list, make sure that you
 638          * register it here with its one or more macros!
 639          */
 640
 641         switch (tok) {
 642         case (MDOC_An):
 643                 if (xstrcmp(argv, "split"))
 644                         return(MDOC_Split);
 645                 else if (xstrcmp(argv, "nosplit"))
 646                         return(MDOC_Nosplit);
 647                 break;
 648
 649         case (MDOC_Bd):
 650                 if (xstrcmp(argv, "ragged"))
 651                         return(MDOC_Ragged);
 652                 else if (xstrcmp(argv, "unfilled"))
 653                         return(MDOC_Unfilled);
 654                 else if (xstrcmp(argv, "filled"))
 655                         return(MDOC_Filled);
 656                 else if (xstrcmp(argv, "literal"))
 657                         return(MDOC_Literal);
 658                 else if (xstrcmp(argv, "file"))
 659                         return(MDOC_File);
 660                 else if (xstrcmp(argv, "offset"))
 661                         return(MDOC_Offset);
 662                 break;
 663
 664         case (MDOC_Bf):
 665                 if (xstrcmp(argv, "emphasis"))
 666                         return(MDOC_Emphasis);
 667                 else if (xstrcmp(argv, "literal"))
 668                         return(MDOC_Literal);
 669                 else if (xstrcmp(argv, "symbolic"))
 670                         return(MDOC_Symbolic);
 671                 break;
 672
 673         case (MDOC_Bk):
 674                 if (xstrcmp(argv, "words"))
 675                         return(MDOC_Words);
 676                 break;
 677
 678         case (MDOC_Bl):
 679                 if (xstrcmp(argv, "bullet"))
 680                         return(MDOC_Bullet);
 681                 else if (xstrcmp(argv, "dash"))
 682                         return(MDOC_Dash);
 683                 else if (xstrcmp(argv, "hyphen"))
 684                         return(MDOC_Hyphen);
 685                 else if (xstrcmp(argv, "item"))
 686                         return(MDOC_Item);
 687                 else if (xstrcmp(argv, "enum"))
 688                         return(MDOC_Enum);
 689                 else if (xstrcmp(argv, "tag"))
 690                         return(MDOC_Tag);
 691                 else if (xstrcmp(argv, "diag"))
 692                         return(MDOC_Diag);
 693                 else if (xstrcmp(argv, "hang"))
 694                         return(MDOC_Hang);
 695                 else if (xstrcmp(argv, "ohang"))
 696                         return(MDOC_Ohang);
 697                 else if (xstrcmp(argv, "inset"))
 698                         return(MDOC_Inset);
 699                 else if (xstrcmp(argv, "column"))
 700                         return(MDOC_Column);
 701                 else if (xstrcmp(argv, "width"))
 702                         return(MDOC_Width);
 703                 else if (xstrcmp(argv, "offset"))
 704                         return(MDOC_Offset);
 705                 else if (xstrcmp(argv, "compact"))
 706                         return(MDOC_Compact);
 707                 break;
 708
 709         case (MDOC_Rv):
 710                 /* FALLTHROUGH */
 711         case (MDOC_Ex):
 712                 if (xstrcmp(argv, "std"))
 713                         return(MDOC_Std);
 714                 break;
 715         default:
 716                 break;
 717         }
 718
 719         return(MDOC_ARG_MAX);
 720 }
 721
 722
 723 static int
 724 argv_multi(struct mdoc *mdoc, int line,
 725                 struct mdoc_argv *v, int *pos, char *buf)
 726 {
 727         int              c, ppos;
 728         char            *p;
 729
 730         ppos = *pos;
 731
 732         for (v->sz = 0; ; v->sz++) {
 733                 if ('-' == buf[*pos])
 734                         break;
 735                 c = args(mdoc, line, pos, buf, ARGS_QUOTED, &p);
 736                 if (ARGS_ERROR == c)
 737                         return(0);
 738                 else if (ARGS_EOLN == c)
 739                         break;
 740
 741                 if (0 == v->sz % 5)
 742                         v->value = xrealloc(v->value,
 743                                 (v->sz + 5) * sizeof(char *));
 744
 745                 v->value[(int)v->sz] = p;
 746         }
 747
 748         if (v->sz)
 749                 return(1);
 750
 751         return(perr(mdoc, line, ppos, EARGVAL));
 752 }
 753
 754
 755 static int
 756 argv_opt_single(struct mdoc *mdoc, int line,
 757                 struct mdoc_argv *v, int *pos, char *buf)
 758 {
 759         int              c;
 760         char            *p;
 761
 762         if ('-' == buf[*pos])
 763                 return(1);
 764
 765         c = args(mdoc, line, pos, buf, ARGS_QUOTED, &p);
 766         if (ARGS_ERROR == c)
 767                 return(0);
 768         if (ARGS_EOLN == c)
 769                 return(1);
 770
 771         v->sz = 1;
 772         v->value = xcalloc(1, sizeof(char *));
 773         v->value[0] = p;
 774         return(1);
 775 }
 776
 777
 778 /*
 779  * Parse a single, mandatory value from the stream.
 780  */
 781 static int
 782 argv_single(struct mdoc *mdoc, int line,
 783                 struct mdoc_argv *v, int *pos, char *buf)
 784 {
 785         int              c, ppos;
 786         char            *p;
 787
 788         ppos = *pos;
 789
 790         c = args(mdoc, line, pos, buf, ARGS_QUOTED, &p);
 791         if (ARGS_ERROR == c)
 792                 return(0);
 793         if (ARGS_EOLN == c)
 794                 return(perr(mdoc, line, ppos, EARGVAL));
 795
 796         v->sz = 1;
 797         v->value = xcalloc(1, sizeof(char *));
 798         v->value[0] = p;
 799         return(1);
 800 }
 801
 802
 803 /*
 804  * Determine rules for parsing arguments.  Arguments can either accept
 805  * no parameters, an optional single parameter, one parameter, or
 806  * multiple parameters.
 807  */
 808 static int
 809 argv(struct mdoc *mdoc, int tok, int line,
 810                 struct mdoc_argv *v, int *pos, char *buf)
 811 {
 812         int              fl;
 813
 814         v->sz = 0;
 815         v->value = NULL;
 816         fl = mdoc_argvflags[v->arg];
 817
 818         /*
 819          * Override the default per-argument value.
 820          */
 821
 822         switch (tok) {
 823         case (MDOC_Ex):
 824                 fl = ARGV_OPT_SINGLE;
 825                 break;
 826         default:
 827                 break;
 828         }
 829
 830         switch (fl) {
 831         case (ARGV_SINGLE):
 832                 return(argv_single(mdoc, line, v, pos, buf));
 833         case (ARGV_MULTI):
 834                 return(argv_multi(mdoc, line, v, pos, buf));
 835         case (ARGV_OPT_SINGLE):
 836                 return(argv_opt_single(mdoc, line, v, pos, buf));
 837         default:
 838                 /* ARGV_NONE */
 839                 break;
 840         }
 841
 842         return(1);
 843 }