mdoc_argv.c

   1 /*      $Id: mdoc_argv.c,v 1.21 2009/07/20 14:12:27 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
  37 #define ARGS_DELIM      (1 << 1)
  38 #define ARGS_TABSEP     (1 << 2)
  39
  40 #define ARGV_NONE       (1 << 0)
  41 #define ARGV_SINGLE     (1 << 1)
  42 #define ARGV_MULTI      (1 << 2)
  43 #define ARGV_OPT_SINGLE (1 << 3)
  44
  45 #define MULTI_STEP       5
  46
  47 static  int              argv_a2arg(int, const char *);
  48 static  int              args(struct mdoc *, int, int *,
  49                                 char *, int, char **);
  50 static  int              argv(struct mdoc *, int,
  51                                 struct mdoc_argv *, int *, char *);
  52 static  int              argv_single(struct mdoc *, int,
  53                                 struct mdoc_argv *, int *, char *);
  54 static  int              argv_opt_single(struct mdoc *, int,
  55                                 struct mdoc_argv *, int *, char *);
  56 static  int              argv_multi(struct mdoc *, int,
  57                                 struct mdoc_argv *, int *, char *);
  58
  59 /* Per-argument flags. */
  60
  61 static  int mdoc_argvflags[MDOC_ARG_MAX] = {
  62         ARGV_NONE,      /* MDOC_Split */
  63         ARGV_NONE,      /* MDOC_Nosplit */
  64         ARGV_NONE,      /* MDOC_Ragged */
  65         ARGV_NONE,      /* MDOC_Unfilled */
  66         ARGV_NONE,      /* MDOC_Literal */
  67         ARGV_NONE,      /* MDOC_File */
  68         ARGV_SINGLE,    /* MDOC_Offset */
  69         ARGV_NONE,      /* MDOC_Bullet */
  70         ARGV_NONE,      /* MDOC_Dash */
  71         ARGV_NONE,      /* MDOC_Hyphen */
  72         ARGV_NONE,      /* MDOC_Item */
  73         ARGV_NONE,      /* MDOC_Enum */
  74         ARGV_NONE,      /* MDOC_Tag */
  75         ARGV_NONE,      /* MDOC_Diag */
  76         ARGV_NONE,      /* MDOC_Hang */
  77         ARGV_NONE,      /* MDOC_Ohang */
  78         ARGV_NONE,      /* MDOC_Inset */
  79         ARGV_MULTI,     /* MDOC_Column */
  80         ARGV_SINGLE,    /* MDOC_Width */
  81         ARGV_NONE,      /* MDOC_Compact */
  82         ARGV_OPT_SINGLE, /* MDOC_Std */
  83         ARGV_NONE,      /* MDOC_Filled */
  84         ARGV_NONE,      /* MDOC_Words */
  85         ARGV_NONE,      /* MDOC_Emphasis */
  86         ARGV_NONE,      /* MDOC_Symbolic */
  87         ARGV_NONE       /* MDOC_Symbolic */
  88 };
  89
  90 static  int mdoc_argflags[MDOC_MAX] = {
  91         0, /* Ap */
  92         0, /* Dd */
  93         0, /* Dt */
  94         0, /* Os */
  95         0, /* Sh */
  96         0, /* Ss */
  97         ARGS_DELIM, /* Pp */
  98         ARGS_DELIM, /* D1 */
  99         ARGS_DELIM, /* Dl */
 100         0, /* Bd */
 101         0, /* Ed */
 102         0, /* Bl */
 103         0, /* El */
 104         0, /* It */
 105         ARGS_DELIM, /* Ad */
 106         ARGS_DELIM, /* An */
 107         ARGS_DELIM, /* Ar */
 108         0, /* Cd */
 109         ARGS_DELIM, /* Cm */
 110         ARGS_DELIM, /* Dv */
 111         ARGS_DELIM, /* Er */
 112         ARGS_DELIM, /* Ev */
 113         0, /* Ex */
 114         ARGS_DELIM, /* Fa */
 115         0, /* Fd */
 116         ARGS_DELIM, /* Fl */
 117         ARGS_DELIM, /* Fn */
 118         ARGS_DELIM, /* Ft */
 119         ARGS_DELIM, /* Ic */
 120         0, /* In */
 121         ARGS_DELIM, /* Li */
 122         0, /* Nd */
 123         ARGS_DELIM, /* Nm */
 124         ARGS_DELIM, /* Op */
 125         0, /* Ot */
 126         ARGS_DELIM, /* Pa */
 127         0, /* Rv */
 128         ARGS_DELIM, /* St */
 129         ARGS_DELIM, /* Va */
 130         ARGS_DELIM, /* Vt */
 131         ARGS_DELIM, /* Xr */
 132         0, /* %A */
 133         0, /* %B */
 134         0, /* %D */
 135         0, /* %I */
 136         0, /* %J */
 137         0, /* %N */
 138         0, /* %O */
 139         0, /* %P */
 140         0, /* %R */
 141         0, /* %T */
 142         0, /* %V */
 143         ARGS_DELIM, /* Ac */
 144         0, /* Ao */
 145         ARGS_DELIM, /* Aq */
 146         ARGS_DELIM, /* At */
 147         ARGS_DELIM, /* Bc */
 148         0, /* Bf */
 149         0, /* Bo */
 150         ARGS_DELIM, /* Bq */
 151         ARGS_DELIM, /* Bsx */
 152         ARGS_DELIM, /* Bx */
 153         0, /* Db */
 154         ARGS_DELIM, /* Dc */
 155         0, /* Do */
 156         ARGS_DELIM, /* Dq */
 157         ARGS_DELIM, /* Ec */
 158         0, /* Ef */
 159         ARGS_DELIM, /* Em */
 160         0, /* Eo */
 161         ARGS_DELIM, /* Fx */
 162         ARGS_DELIM, /* Ms */
 163         ARGS_DELIM, /* No */
 164         ARGS_DELIM, /* Ns */
 165         ARGS_DELIM, /* Nx */
 166         ARGS_DELIM, /* Ox */
 167         ARGS_DELIM, /* Pc */
 168         ARGS_DELIM, /* Pf */
 169         0, /* Po */
 170         ARGS_DELIM, /* Pq */
 171         ARGS_DELIM, /* Qc */
 172         ARGS_DELIM, /* Ql */
 173         0, /* Qo */
 174         ARGS_DELIM, /* Qq */
 175         0, /* Re */
 176         0, /* Rs */
 177         ARGS_DELIM, /* Sc */
 178         0, /* So */
 179         ARGS_DELIM, /* Sq */
 180         0, /* Sm */
 181         ARGS_DELIM, /* Sx */
 182         ARGS_DELIM, /* Sy */
 183         ARGS_DELIM, /* Tn */
 184         ARGS_DELIM, /* Ux */
 185         ARGS_DELIM, /* Xc */
 186         0, /* Xo */
 187         0, /* Fo */
 188         0, /* Fc */
 189         0, /* Oo */
 190         ARGS_DELIM, /* Oc */
 191         0, /* Bk */
 192         0, /* Ek */
 193         0, /* Bt */
 194         0, /* Hf */
 195         0, /* Fr */
 196         0, /* Ud */
 197         0, /* Lb */
 198         ARGS_DELIM, /* Lp */
 199         ARGS_DELIM, /* Lk */
 200         ARGS_DELIM, /* Mt */
 201         ARGS_DELIM, /* Brq */
 202         0, /* Bro */
 203         ARGS_DELIM, /* Brc */
 204         0, /* %C */
 205         0, /* Es */
 206         0, /* En */
 207         0, /* Dx */
 208         0, /* %Q */
 209         0, /* br */
 210         0, /* sp */
 211 };
 212
 213
 214 /*
 215  * Parse an argument from line text.  This comes in the form of -key
 216  * [value0...], which may either have a single mandatory value, at least
 217  * one mandatory value, an optional single value, or no value.
 218  */
 219 int
 220 mdoc_argv(struct mdoc *m, int line, int tok,
 221                 struct mdoc_arg **v, int *pos, char *buf)
 222 {
 223         char             *p, sv;
 224         struct mdoc_argv tmp;
 225         struct mdoc_arg  *arg;
 226
 227         if (0 == buf[*pos])
 228                 return(ARGV_EOLN);
 229
 230         assert(' ' != buf[*pos]);
 231
 232         /* Parse through to the first unescaped space. */
 233
 234         p = &buf[++(*pos)];
 235
 236         assert(*pos > 0);
 237
 238         /* LINTED */
 239         while (buf[*pos]) {
 240                 if (' ' == buf[*pos])
 241                         if ('\\' != buf[*pos - 1])
 242                                 break;
 243                 (*pos)++;
 244         }
 245
 246         /* XXX - save zeroed byte, if not an argument. */
 247
 248         sv = 0;
 249         if (buf[*pos]) {
 250                 sv = buf[*pos];
 251                 buf[(*pos)++] = 0;
 252         }
 253
 254         (void)memset(&tmp, 0, sizeof(struct mdoc_argv));
 255         tmp.line = line;
 256         tmp.pos = *pos;
 257
 258         /* See if our token accepts the argument. */
 259
 260         if (MDOC_ARG_MAX == (tmp.arg = argv_a2arg(tok, p))) {
 261                 /* XXX - restore saved zeroed byte. */
 262                 if (sv)
 263                         buf[*pos - 1] = sv;
 264                 return(ARGV_WORD);
 265         }
 266
 267         while (buf[*pos] && ' ' == buf[*pos])
 268                 (*pos)++;
 269
 270         if ( ! argv(m, line, &tmp, pos, buf))
 271                 return(ARGV_ERROR);
 272
 273         if (NULL == (arg = *v)) {
 274                 *v = calloc(1, sizeof(struct mdoc_arg));
 275                 if (NULL == *v) {
 276                         (void)mdoc_nerr(m, m->last, EMALLOC);
 277                         return(ARGV_ERROR);
 278                 }
 279                 arg = *v;
 280         }
 281
 282         arg->argc++;
 283         arg->argv = realloc(arg->argv, arg->argc *
 284                         sizeof(struct mdoc_argv));
 285
 286         if (NULL == arg->argv) {
 287                 (void)mdoc_nerr(m, m->last, EMALLOC);
 288                 return(ARGV_ERROR);
 289         }
 290
 291         (void)memcpy(&arg->argv[(int)arg->argc - 1],
 292                         &tmp, sizeof(struct mdoc_argv));
 293
 294         return(ARGV_ARG);
 295 }
 296
 297
 298 void
 299 mdoc_argv_free(struct mdoc_arg *p)
 300 {
 301         int              i, j;
 302
 303         if (NULL == p)
 304                 return;
 305
 306         if (p->refcnt) {
 307                 --(p->refcnt);
 308                 if (p->refcnt)
 309                         return;
 310         }
 311         assert(p->argc);
 312
 313         /* LINTED */
 314         for (i = 0; i < (int)p->argc; i++) {
 315                 if (0 == p->argv[i].sz)
 316                         continue;
 317                 /* LINTED */
 318                 for (j = 0; j < (int)p->argv[i].sz; j++)
 319                         free(p->argv[i].value[j]);
 320
 321                 free(p->argv[i].value);
 322         }
 323
 324         free(p->argv);
 325         free(p);
 326 }
 327
 328
 329 int
 330 mdoc_zargs(struct mdoc *m, int line, int *pos, char *buf, char **v)
 331 {
 332
 333         return(args(m, line, pos, buf, 0, v));
 334 }
 335
 336
 337 int
 338 mdoc_args(struct mdoc *m, int line,
 339                 int *pos, char *buf, int tok, char **v)
 340 {
 341         int               fl, c, i;
 342         struct mdoc_node *n;
 343
 344         fl = (0 == tok) ? 0 : mdoc_argflags[tok];
 345
 346         if (MDOC_It != tok)
 347                 return(args(m, line, pos, buf, fl, v));
 348
 349         /*
 350          * The `It' macro is a special case, as it acquires parameters from its
 351          * parent `Bl' context, specifically, we're concerned with -column.
 352          */
 353
 354         for (n = m->last; n; n = n->parent)
 355                 if (MDOC_BLOCK == n->type && MDOC_Bl == n->tok)
 356                         break;
 357
 358         assert(n);
 359         c = (int)(n->args ? n->args->argc : 0);
 360         assert(c > 0);
 361
 362         /* LINTED */
 363         for (i = 0; i < c; i++) {
 364                 if (MDOC_Column != n->args->argv[i].arg)
 365                         continue;
 366                 fl |= ARGS_TABSEP;
 367                 fl &= ~ARGS_DELIM;
 368                 break;
 369         }
 370
 371         return(args(m, line, pos, buf, fl, v));
 372 }
 373
 374
 375 static int
 376 args(struct mdoc *m, int line, int *pos,
 377                 char *buf, int fl, char **v)
 378 {
 379         int               i;
 380         char             *p, *pp;
 381
 382         assert(*pos);
 383         assert(' ' != buf[*pos]);
 384
 385         if (0 == buf[*pos])
 386                 return(ARGS_EOLN);
 387
 388         /*
 389          * If the first character is a delimiter and we're to look for
 390          * delimited strings, then pass down the buffer seeing if it
 391          * follows the pattern of [[::delim::][ ]+]+.
 392          */
 393
 394         if ((fl & ARGS_DELIM) && mdoc_iscdelim(buf[*pos])) {
 395                 for (i = *pos; buf[i]; ) {
 396                         if ( ! mdoc_iscdelim(buf[i]))
 397                                 break;
 398                         i++;
 399                         if (0 == buf[i] || ' ' != buf[i])
 400                                 break;
 401                         i++;
 402                         while (buf[i] && ' ' == buf[i])
 403                                 i++;
 404                 }
 405
 406                 /* FIXME: warn about trailing whitespace. */
 407
 408                 if (0 == buf[i]) {
 409                         *v = &buf[*pos];
 410                         return(ARGS_PUNCT);
 411                 }
 412         }
 413
 414         *v = &buf[*pos];
 415
 416         /*
 417          * First handle TABSEP items, restricted to `Bl -column'.  This
 418          * ignores conventional token parsing and instead uses tabs or
 419          * `Ta' macros to separate phrases.  Phrases are parsed again
 420          * for arguments at a later phase.
 421          */
 422
 423         if (ARGS_TABSEP & fl) {
 424                 /* Scan ahead to tab (can't be escaped). */
 425                 p = strchr(*v, '\t');
 426
 427                 /* Scan ahead to unescaped `Ta'. */
 428                 for (pp = *v; ; pp++) {
 429                         if (NULL == (pp = strstr(pp, "Ta")))
 430                                 break;
 431                         if (pp > *v && ' ' != *(pp - 1))
 432                                 continue;
 433                         if (' ' == *(pp + 2) || 0 == *(pp + 2))
 434                                 break;
 435                 }
 436
 437                 /*
 438                  * Adjust new-buffer position to be beyond delimiter
 439                  * mark (e.g., Ta -> end + 2).
 440                  */
 441                 if (p && pp) {
 442                         *pos += pp < p ? 2 : 1;
 443                         p = pp < p ? pp : p;
 444                 } else if (p && ! pp) {
 445                         *pos += 1;
 446                 } else if (pp && ! p) {
 447                         p = pp;
 448                         *pos += 2;
 449                 } else
 450                         p = strchr(*v, 0);
 451
 452                 /* Whitespace check for eoln case... */
 453                 if (0 == *p && ' ' == *(p - 1))
 454                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 455                                 return(ARGS_ERROR);
 456
 457                 *pos += (int)(p - *v);
 458
 459                 /* Strip delimiter's preceding whitespace. */
 460                 pp = p - 1;
 461                 while (pp > *v && ' ' == *pp) {
 462                         if (pp > *v && '\\' == *(pp - 1))
 463                                 break;
 464                         pp--;
 465                 }
 466                 *(pp + 1) = 0;
 467
 468                 /* Strip delimiter's proceeding whitespace. */
 469                 for (pp = &buf[*pos]; ' ' == *pp; pp++, (*pos)++)
 470                         /* Skip ahead. */ ;
 471
 472                 return(ARGS_PHRASE);
 473         }
 474
 475         /*
 476          * Process a quoted literal.  A quote begins with a double-quote
 477          * and ends with a double-quote NOT preceded by a double-quote.
 478          * Whitespace is NOT involved in literal termination.
 479          */
 480
 481         if ('\"' == buf[*pos]) {
 482                 *v = &buf[++(*pos)];
 483
 484                 for ( ; buf[*pos]; (*pos)++) {
 485                         if ('\"' != buf[*pos])
 486                                 continue;
 487                         if ('\"' != buf[*pos + 1])
 488                                 break;
 489                         (*pos)++;
 490                 }
 491
 492                 if (0 == buf[*pos]) {
 493                         if ( ! mdoc_pwarn(m, line, *pos, EQUOTTERM))
 494                                 return(ARGS_ERROR);
 495                         return(ARGS_QWORD);
 496                 }
 497
 498                 buf[(*pos)++] = 0;
 499
 500                 if (0 == buf[*pos])
 501                         return(ARGS_QWORD);
 502
 503                 while (' ' == buf[*pos])
 504                         (*pos)++;
 505
 506                 if (0 == buf[*pos])
 507                         if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 508                                 return(ARGS_ERROR);
 509
 510                 return(ARGS_QWORD);
 511         }
 512
 513         /*
 514          * A non-quoted term progresses until either the end of line or
 515          * a non-escaped whitespace.
 516          */
 517
 518         for ( ; buf[*pos]; (*pos)++)
 519                 if (' ' == buf[*pos] && '\\' != buf[*pos - 1])
 520                         break;
 521
 522         if (0 == buf[*pos])
 523                 return(ARGS_WORD);
 524
 525         buf[(*pos)++] = 0;
 526
 527         while (' ' == buf[*pos])
 528                 (*pos)++;
 529
 530         if (0 == buf[*pos])
 531                 if ( ! mdoc_pwarn(m, line, *pos, ETAILWS))
 532                         return(ARGS_ERROR);
 533
 534         return(ARGS_WORD);
 535 }
 536
 537
 538 static int
 539 argv_a2arg(int tok, const char *argv)
 540 {
 541
 542         /*
 543          * Parse an argument identifier from its text.  XXX - this
 544          * should really be table-driven to clarify the code.
 545          *
 546          * If you add an argument to the list, make sure that you
 547          * register it here with its one or more macros!
 548          */
 549
 550         switch (tok) {
 551         case (MDOC_An):
 552                 if (0 == strcmp(argv, "split"))
 553                         return(MDOC_Split);
 554                 else if (0 == strcmp(argv, "nosplit"))
 555                         return(MDOC_Nosplit);
 556                 break;
 557
 558         case (MDOC_Bd):
 559                 if (0 == strcmp(argv, "ragged"))
 560                         return(MDOC_Ragged);
 561                 else if (0 == strcmp(argv, "unfilled"))
 562                         return(MDOC_Unfilled);
 563                 else if (0 == strcmp(argv, "filled"))
 564                         return(MDOC_Filled);
 565                 else if (0 == strcmp(argv, "literal"))
 566                         return(MDOC_Literal);
 567                 else if (0 == strcmp(argv, "file"))
 568                         return(MDOC_File);
 569                 else if (0 == strcmp(argv, "offset"))
 570                         return(MDOC_Offset);
 571                 else if (0 == strcmp(argv, "compact"))
 572                         return(MDOC_Compact);
 573                 break;
 574
 575         case (MDOC_Bf):
 576                 if (0 == strcmp(argv, "emphasis"))
 577                         return(MDOC_Emphasis);
 578                 else if (0 == strcmp(argv, "literal"))
 579                         return(MDOC_Literal);
 580                 else if (0 == strcmp(argv, "symbolic"))
 581                         return(MDOC_Symbolic);
 582                 break;
 583
 584         case (MDOC_Bk):
 585                 if (0 == strcmp(argv, "words"))
 586                         return(MDOC_Words);
 587                 break;
 588
 589         case (MDOC_Bl):
 590                 if (0 == strcmp(argv, "bullet"))
 591                         return(MDOC_Bullet);
 592                 else if (0 == strcmp(argv, "dash"))
 593                         return(MDOC_Dash);
 594                 else if (0 == strcmp(argv, "hyphen"))
 595                         return(MDOC_Hyphen);
 596                 else if (0 == strcmp(argv, "item"))
 597                         return(MDOC_Item);
 598                 else if (0 == strcmp(argv, "enum"))
 599                         return(MDOC_Enum);
 600                 else if (0 == strcmp(argv, "tag"))
 601                         return(MDOC_Tag);
 602                 else if (0 == strcmp(argv, "diag"))
 603                         return(MDOC_Diag);
 604                 else if (0 == strcmp(argv, "hang"))
 605                         return(MDOC_Hang);
 606                 else if (0 == strcmp(argv, "ohang"))
 607                         return(MDOC_Ohang);
 608                 else if (0 == strcmp(argv, "inset"))
 609                         return(MDOC_Inset);
 610                 else if (0 == strcmp(argv, "column"))
 611                         return(MDOC_Column);
 612                 else if (0 == strcmp(argv, "width"))
 613                         return(MDOC_Width);
 614                 else if (0 == strcmp(argv, "offset"))
 615                         return(MDOC_Offset);
 616                 else if (0 == strcmp(argv, "compact"))
 617                         return(MDOC_Compact);
 618                 else if (0 == strcmp(argv, "nested"))
 619                         return(MDOC_Nested);
 620                 break;
 621
 622         case (MDOC_Rv):
 623                 /* FALLTHROUGH */
 624         case (MDOC_Ex):
 625                 if (0 == strcmp(argv, "std"))
 626                         return(MDOC_Std);
 627                 break;
 628         default:
 629                 break;
 630         }
 631
 632         return(MDOC_ARG_MAX);
 633 }
 634
 635
 636 static int
 637 argv_multi(struct mdoc *m, int line,
 638                 struct mdoc_argv *v, int *pos, char *buf)
 639 {
 640         int              c;
 641         char            *p;
 642
 643         for (v->sz = 0; ; v->sz++) {
 644                 if ('-' == buf[*pos])
 645                         break;
 646                 c = args(m, line, pos, buf, 0, &p);
 647                 if (ARGS_ERROR == c)
 648                         return(0);
 649                 else if (ARGS_EOLN == c)
 650                         break;
 651
 652                 if (0 == v->sz % MULTI_STEP) {
 653                         v->value = realloc(v->value,
 654                                 (v->sz + MULTI_STEP) * sizeof(char *));
 655                         if (NULL == v->value) {
 656                                 (void)mdoc_nerr(m, m->last, EMALLOC);
 657                                 return(ARGV_ERROR);
 658                         }
 659                 }
 660                 if (NULL == (v->value[(int)v->sz] = strdup(p)))
 661                         return(mdoc_nerr(m, m->last, EMALLOC));
 662         }
 663
 664         return(1);
 665 }
 666
 667
 668 static int
 669 argv_opt_single(struct mdoc *m, int line,
 670                 struct mdoc_argv *v, int *pos, char *buf)
 671 {
 672         int              c;
 673         char            *p;
 674
 675         if ('-' == buf[*pos])
 676                 return(1);
 677
 678         c = args(m, line, pos, buf, 0, &p);
 679         if (ARGS_ERROR == c)
 680                 return(0);
 681         if (ARGS_EOLN == c)
 682                 return(1);
 683
 684         v->sz = 1;
 685         if (NULL == (v->value = calloc(1, sizeof(char *))))
 686                 return(mdoc_nerr(m, m->last, EMALLOC));
 687         if (NULL == (v->value[0] = strdup(p)))
 688                 return(mdoc_nerr(m, m->last, EMALLOC));
 689
 690         return(1);
 691 }
 692
 693
 694 /*
 695  * Parse a single, mandatory value from the stream.
 696  */
 697 static int
 698 argv_single(struct mdoc *m, int line,
 699                 struct mdoc_argv *v, int *pos, char *buf)
 700 {
 701         int              c, ppos;
 702         char            *p;
 703
 704         ppos = *pos;
 705
 706         c = args(m, line, pos, buf, 0, &p);
 707         if (ARGS_ERROR == c)
 708                 return(0);
 709         if (ARGS_EOLN == c)
 710                 return(mdoc_perr(m, line, ppos, EARGVAL));
 711
 712         v->sz = 1;
 713         if (NULL == (v->value = calloc(1, sizeof(char *))))
 714                 return(mdoc_nerr(m, m->last, EMALLOC));
 715         if (NULL == (v->value[0] = strdup(p)))
 716                 return(mdoc_nerr(m, m->last, EMALLOC));
 717
 718         return(1);
 719 }
 720
 721
 722 /*
 723  * Determine rules for parsing arguments.  Arguments can either accept
 724  * no parameters, an optional single parameter, one parameter, or
 725  * multiple parameters.
 726  */
 727 static int
 728 argv(struct mdoc *mdoc, int line,
 729                 struct mdoc_argv *v, int *pos, char *buf)
 730 {
 731
 732         v->sz = 0;
 733         v->value = NULL;
 734
 735         switch (mdoc_argvflags[v->arg]) {
 736         case (ARGV_SINGLE):
 737                 return(argv_single(mdoc, line, v, pos, buf));
 738         case (ARGV_MULTI):
 739                 return(argv_multi(mdoc, line, v, pos, buf));
 740         case (ARGV_OPT_SINGLE):
 741                 return(argv_opt_single(mdoc, line, v, pos, buf));
 742         default:
 743                 /* ARGV_NONE */
 744                 break;
 745         }
 746
 747         return(1);
 748 }