usr.bin/mandoc/mdoc.c

   1 /*      $Id: mdoc.c,v 1.113 2009/10/30 05:58:38 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 <stdarg.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include "libmdoc.h"
  27 #include "libmandoc.h"
  28
  29 const   char *const __mdoc_merrnames[MERRMAX] = {
  30         "trailing whitespace", /* ETAILWS */
  31         "unexpected quoted parameter", /* EQUOTPARM */
  32         "unterminated quoted parameter", /* EQUOTTERM */
  33         "argument parameter suggested", /* EARGVAL */
  34         "macro disallowed in prologue", /* EBODYPROL */
  35         "macro disallowed in body", /* EPROLBODY */
  36         "text disallowed in prologue", /* ETEXTPROL */
  37         "blank line disallowed", /* ENOBLANK */
  38         "text parameter too long", /* ETOOLONG */
  39         "invalid escape sequence", /* EESCAPE */
  40         "invalid character", /* EPRINT */
  41         "document has no body", /* ENODAT */
  42         "document has no prologue", /* ENOPROLOGUE */
  43         "expected line arguments", /* ELINE */
  44         "invalid AT&T argument", /* EATT */
  45         "default name not yet set", /* ENAME */
  46         "missing list type", /* ELISTTYPE */
  47         "missing display type", /* EDISPTYPE */
  48         "too many display types", /* EMULTIDISP */
  49         "too many list types", /* EMULTILIST */
  50         "NAME section must be first", /* ESECNAME */
  51         "badly-formed NAME section", /* ENAMESECINC */
  52         "argument repeated", /* EARGREP */
  53         "expected boolean parameter", /* EBOOL */
  54         "inconsistent column syntax", /* ECOLMIS */
  55         "nested display invalid", /* ENESTDISP */
  56         "width argument missing", /* EMISSWIDTH */
  57         "invalid section for this manual section", /* EWRONGMSEC */
  58         "section out of conventional order", /* ESECOOO */
  59         "section repeated", /* ESECREP */
  60         "invalid standard argument", /* EBADSTAND */
  61         "multi-line arguments discouraged", /* ENOMULTILINE */
  62         "multi-line arguments suggested", /* EMULTILINE */
  63         "line arguments discouraged", /* ENOLINE */
  64         "prologue macro out of conventional order", /* EPROLOOO */
  65         "prologue macro repeated", /* EPROLREP */
  66         "invalid manual section", /* EBADMSEC */
  67         "invalid section", /* EBADSEC */
  68         "invalid font mode", /* EFONT */
  69         "invalid date syntax", /* EBADDATE */
  70         "invalid number format", /* ENUMFMT */
  71         "superfluous width argument", /* ENOWIDTH */
  72         "system: utsname error", /* EUTSNAME */
  73         "obsolete macro", /* EOBS */
  74         "end-of-line scope violation", /* EIMPBRK */
  75         "empty macro ignored", /* EIGNE */
  76         "unclosed explicit scope", /* EOPEN */
  77         "unterminated quoted phrase", /* EQUOTPHR */
  78         "closure macro without prior context", /* ENOCTX */
  79         "no description found for library", /* ELIB */
  80         "bad child for parent context", /* EBADCHILD */
  81         "list arguments preceding type", /* ENOTYPE */
  82 };
  83
  84 const   char *const __mdoc_macronames[MDOC_MAX] = {
  85         "Ap",           "Dd",           "Dt",           "Os",
  86         "Sh",           "Ss",           "Pp",           "D1",
  87         "Dl",           "Bd",           "Ed",           "Bl",
  88         "El",           "It",           "Ad",           "An",
  89         "Ar",           "Cd",           "Cm",           "Dv",
  90         "Er",           "Ev",           "Ex",           "Fa",
  91         "Fd",           "Fl",           "Fn",           "Ft",
  92         "Ic",           "In",           "Li",           "Nd",
  93         "Nm",           "Op",           "Ot",           "Pa",
  94         "Rv",           "St",           "Va",           "Vt",
  95         /* LINTED */
  96         "Xr",           "\%A",          "\%B",          "\%D",
  97         /* LINTED */
  98         "\%I",          "\%J",          "\%N",          "\%O",
  99         /* LINTED */
 100         "\%P",          "\%R",          "\%T",          "\%V",
 101         "Ac",           "Ao",           "Aq",           "At",
 102         "Bc",           "Bf",           "Bo",           "Bq",
 103         "Bsx",          "Bx",           "Db",           "Dc",
 104         "Do",           "Dq",           "Ec",           "Ef",
 105         "Em",           "Eo",           "Fx",           "Ms",
 106         "No",           "Ns",           "Nx",           "Ox",
 107         "Pc",           "Pf",           "Po",           "Pq",
 108         "Qc",           "Ql",           "Qo",           "Qq",
 109         "Re",           "Rs",           "Sc",           "So",
 110         "Sq",           "Sm",           "Sx",           "Sy",
 111         "Tn",           "Ux",           "Xc",           "Xo",
 112         "Fo",           "Fc",           "Oo",           "Oc",
 113         "Bk",           "Ek",           "Bt",           "Hf",
 114         "Fr",           "Ud",           "Lb",           "Lp",
 115         "Lk",           "Mt",           "Brq",          "Bro",
 116         /* LINTED */
 117         "Brc",          "\%C",          "Es",           "En",
 118         /* LINTED */
 119         "Dx",           "\%Q",          "br",           "sp",
 120         /* LINTED */
 121         "\%U"
 122         };
 123
 124 const   char *const __mdoc_argnames[MDOC_ARG_MAX] = {
 125         "split",                "nosplit",              "ragged",
 126         "unfilled",             "literal",              "file",
 127         "offset",               "bullet",               "dash",
 128         "hyphen",               "item",                 "enum",
 129         "tag",                  "diag",                 "hang",
 130         "ohang",                "inset",                "column",
 131         "width",                "compact",              "std",
 132         "filled",               "words",                "emphasis",
 133         "symbolic",             "nested",               "centered"
 134         };
 135
 136 const   char * const *mdoc_macronames = __mdoc_macronames;
 137 const   char * const *mdoc_argnames = __mdoc_argnames;
 138
 139 static  void              mdoc_free1(struct mdoc *);
 140 static  void              mdoc_alloc1(struct mdoc *);
 141 static  struct mdoc_node *node_alloc(struct mdoc *, int, int,
 142                                 int, enum mdoc_type);
 143 static  int               node_append(struct mdoc *,
 144                                 struct mdoc_node *);
 145 static  int               parsetext(struct mdoc *, int, char *);
 146 static  int               parsemacro(struct mdoc *, int, char *);
 147 static  int               macrowarn(struct mdoc *, int, const char *);
 148 static  int               pstring(struct mdoc *, int, int,
 149                                 const char *, size_t);
 150
 151 #ifdef __linux__
 152 extern  size_t            strlcpy(char *, const char *, size_t);
 153 #endif
 154
 155
 156 const struct mdoc_node *
 157 mdoc_node(const struct mdoc *m)
 158 {
 159
 160         return(MDOC_HALT & m->flags ? NULL : m->first);
 161 }
 162
 163
 164 const struct mdoc_meta *
 165 mdoc_meta(const struct mdoc *m)
 166 {
 167
 168         return(MDOC_HALT & m->flags ? NULL : &m->meta);
 169 }
 170
 171
 172 /*
 173  * Frees volatile resources (parse tree, meta-data, fields).
 174  */
 175 static void
 176 mdoc_free1(struct mdoc *mdoc)
 177 {
 178
 179         if (mdoc->first)
 180                 mdoc_node_freelist(mdoc->first);
 181         if (mdoc->meta.title)
 182                 free(mdoc->meta.title);
 183         if (mdoc->meta.os)
 184                 free(mdoc->meta.os);
 185         if (mdoc->meta.name)
 186                 free(mdoc->meta.name);
 187         if (mdoc->meta.arch)
 188                 free(mdoc->meta.arch);
 189         if (mdoc->meta.vol)
 190                 free(mdoc->meta.vol);
 191 }
 192
 193
 194 /*
 195  * Allocate all volatile resources (parse tree, meta-data, fields).
 196  */
 197 static void
 198 mdoc_alloc1(struct mdoc *mdoc)
 199 {
 200
 201         memset(&mdoc->meta, 0, sizeof(struct mdoc_meta));
 202         mdoc->flags = 0;
 203         mdoc->lastnamed = mdoc->lastsec = SEC_NONE;
 204         mdoc->last = mandoc_calloc(1, sizeof(struct mdoc_node));
 205         mdoc->first = mdoc->last;
 206         mdoc->last->type = MDOC_ROOT;
 207         mdoc->next = MDOC_NEXT_CHILD;
 208 }
 209
 210
 211 /*
 212  * Free up volatile resources (see mdoc_free1()) then re-initialises the
 213  * data with mdoc_alloc1().  After invocation, parse data has been reset
 214  * and the parser is ready for re-invocation on a new tree; however,
 215  * cross-parse non-volatile data is kept intact.
 216  */
 217 void
 218 mdoc_reset(struct mdoc *mdoc)
 219 {
 220
 221         mdoc_free1(mdoc);
 222         mdoc_alloc1(mdoc);
 223 }
 224
 225
 226 /*
 227  * Completely free up all volatile and non-volatile parse resources.
 228  * After invocation, the pointer is no longer usable.
 229  */
 230 void
 231 mdoc_free(struct mdoc *mdoc)
 232 {
 233
 234         mdoc_free1(mdoc);
 235         free(mdoc);
 236 }
 237
 238
 239 /*
 240  * Allocate volatile and non-volatile parse resources.
 241  */
 242 struct mdoc *
 243 mdoc_alloc(void *data, int pflags, const struct mdoc_cb *cb)
 244 {
 245         struct mdoc     *p;
 246
 247         p = mandoc_calloc(1, sizeof(struct mdoc));
 248
 249         if (cb)
 250                 memcpy(&p->cb, cb, sizeof(struct mdoc_cb));
 251
 252         p->data = data;
 253         p->pflags = pflags;
 254
 255         mdoc_hash_init();
 256         mdoc_alloc1(p);
 257         return(p);
 258 }
 259
 260
 261 /*
 262  * Climb back up the parse tree, validating open scopes.  Mostly calls
 263  * through to macro_end() in macro.c.
 264  */
 265 int
 266 mdoc_endparse(struct mdoc *m)
 267 {
 268
 269         if (MDOC_HALT & m->flags)
 270                 return(0);
 271         else if (mdoc_macroend(m))
 272                 return(1);
 273         m->flags |= MDOC_HALT;
 274         return(0);
 275 }
 276
 277
 278 /*
 279  * Main parse routine.  Parses a single line -- really just hands off to
 280  * the macro (parsemacro()) or text parser (parsetext()).
 281  */
 282 int
 283 mdoc_parseln(struct mdoc *m, int ln, char *buf)
 284 {
 285
 286         if (MDOC_HALT & m->flags)
 287                 return(0);
 288
 289         return('.' == *buf ? parsemacro(m, ln, buf) :
 290                         parsetext(m, ln, buf));
 291 }
 292
 293
 294 int
 295 mdoc_verr(struct mdoc *mdoc, int ln, int pos,
 296                 const char *fmt, ...)
 297 {
 298         char             buf[256];
 299         va_list          ap;
 300
 301         if (NULL == mdoc->cb.mdoc_err)
 302                 return(0);
 303
 304         va_start(ap, fmt);
 305         (void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 306         va_end(ap);
 307
 308         return((*mdoc->cb.mdoc_err)(mdoc->data, ln, pos, buf));
 309 }
 310
 311
 312 int
 313 mdoc_vwarn(struct mdoc *mdoc, int ln, int pos, const char *fmt, ...)
 314 {
 315         char             buf[256];
 316         va_list          ap;
 317
 318         if (NULL == mdoc->cb.mdoc_warn)
 319                 return(0);
 320
 321         va_start(ap, fmt);
 322         (void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 323         va_end(ap);
 324
 325         return((*mdoc->cb.mdoc_warn)(mdoc->data, ln, pos, buf));
 326 }
 327
 328
 329 int
 330 mdoc_err(struct mdoc *m, int line, int pos, int iserr, enum merr type)
 331 {
 332         const char      *p;
 333
 334         p = __mdoc_merrnames[(int)type];
 335         assert(p);
 336
 337         if (iserr)
 338                 return(mdoc_verr(m, line, pos, p));
 339
 340         return(mdoc_vwarn(m, line, pos, p));
 341 }
 342
 343
 344 int
 345 mdoc_macro(struct mdoc *m, int tok,
 346                 int ln, int pp, int *pos, char *buf)
 347 {
 348         /*
 349          * If we're in the prologue, deny "body" macros.  Similarly, if
 350          * we're in the body, deny prologue calls.
 351          */
 352         if (MDOC_PROLOGUE & mdoc_macros[tok].flags &&
 353                         MDOC_PBODY & m->flags)
 354                 return(mdoc_perr(m, ln, pp, EPROLBODY));
 355         if ( ! (MDOC_PROLOGUE & mdoc_macros[tok].flags) &&
 356                         ! (MDOC_PBODY & m->flags))
 357                 return(mdoc_perr(m, ln, pp, EBODYPROL));
 358
 359         return((*mdoc_macros[tok].fp)(m, tok, ln, pp, pos, buf));
 360 }
 361
 362
 363 static int
 364 node_append(struct mdoc *mdoc, struct mdoc_node *p)
 365 {
 366
 367         assert(mdoc->last);
 368         assert(mdoc->first);
 369         assert(MDOC_ROOT != p->type);
 370
 371         switch (mdoc->next) {
 372         case (MDOC_NEXT_SIBLING):
 373                 mdoc->last->next = p;
 374                 p->prev = mdoc->last;
 375                 p->parent = mdoc->last->parent;
 376                 break;
 377         case (MDOC_NEXT_CHILD):
 378                 mdoc->last->child = p;
 379                 p->parent = mdoc->last;
 380                 break;
 381         default:
 382                 abort();
 383                 /* NOTREACHED */
 384         }
 385
 386         p->parent->nchild++;
 387
 388         if ( ! mdoc_valid_pre(mdoc, p))
 389                 return(0);
 390         if ( ! mdoc_action_pre(mdoc, p))
 391                 return(0);
 392
 393         switch (p->type) {
 394         case (MDOC_HEAD):
 395                 assert(MDOC_BLOCK == p->parent->type);
 396                 p->parent->head = p;
 397                 break;
 398         case (MDOC_TAIL):
 399                 assert(MDOC_BLOCK == p->parent->type);
 400                 p->parent->tail = p;
 401                 break;
 402         case (MDOC_BODY):
 403                 assert(MDOC_BLOCK == p->parent->type);
 404                 p->parent->body = p;
 405                 break;
 406         default:
 407                 break;
 408         }
 409
 410         mdoc->last = p;
 411
 412         switch (p->type) {
 413         case (MDOC_TEXT):
 414                 if ( ! mdoc_valid_post(mdoc))
 415                         return(0);
 416                 if ( ! mdoc_action_post(mdoc))
 417                         return(0);
 418                 break;
 419         default:
 420                 break;
 421         }
 422
 423         return(1);
 424 }
 425
 426
 427 static struct mdoc_node *
 428 node_alloc(struct mdoc *m, int line,
 429                 int pos, int tok, enum mdoc_type type)
 430 {
 431         struct mdoc_node *p;
 432
 433         p = mandoc_calloc(1, sizeof(struct mdoc_node));
 434         p->sec = m->lastsec;
 435         p->line = line;
 436         p->pos = pos;
 437         p->tok = tok;
 438         if (MDOC_TEXT != (p->type = type))
 439                 assert(p->tok >= 0);
 440
 441         return(p);
 442 }
 443
 444
 445 int
 446 mdoc_tail_alloc(struct mdoc *m, int line, int pos, int tok)
 447 {
 448         struct mdoc_node *p;
 449
 450         p = node_alloc(m, line, pos, tok, MDOC_TAIL);
 451         if ( ! node_append(m, p))
 452                 return(0);
 453         m->next = MDOC_NEXT_CHILD;
 454         return(1);
 455 }
 456
 457
 458 int
 459 mdoc_head_alloc(struct mdoc *m, int line, int pos, int tok)
 460 {
 461         struct mdoc_node *p;
 462
 463         assert(m->first);
 464         assert(m->last);
 465
 466         p = node_alloc(m, line, pos, tok, MDOC_HEAD);
 467         if ( ! node_append(m, p))
 468                 return(0);
 469         m->next = MDOC_NEXT_CHILD;
 470         return(1);
 471 }
 472
 473
 474 int
 475 mdoc_body_alloc(struct mdoc *m, int line, int pos, int tok)
 476 {
 477         struct mdoc_node *p;
 478
 479         p = node_alloc(m, line, pos, tok, MDOC_BODY);
 480         if ( ! node_append(m, p))
 481                 return(0);
 482         m->next = MDOC_NEXT_CHILD;
 483         return(1);
 484 }
 485
 486
 487 int
 488 mdoc_block_alloc(struct mdoc *m, int line, int pos,
 489                 int tok, struct mdoc_arg *args)
 490 {
 491         struct mdoc_node *p;
 492
 493         p = node_alloc(m, line, pos, tok, MDOC_BLOCK);
 494         p->args = args;
 495         if (p->args)
 496                 (args->refcnt)++;
 497         if ( ! node_append(m, p))
 498                 return(0);
 499         m->next = MDOC_NEXT_CHILD;
 500         return(1);
 501 }
 502
 503
 504 int
 505 mdoc_elem_alloc(struct mdoc *m, int line, int pos,
 506                 int tok, struct mdoc_arg *args)
 507 {
 508         struct mdoc_node *p;
 509
 510         p = node_alloc(m, line, pos, tok, MDOC_ELEM);
 511         p->args = args;
 512         if (p->args)
 513                 (args->refcnt)++;
 514         if ( ! node_append(m, p))
 515                 return(0);
 516         m->next = MDOC_NEXT_CHILD;
 517         return(1);
 518 }
 519
 520
 521 static int
 522 pstring(struct mdoc *m, int line, int pos, const char *p, size_t len)
 523 {
 524         struct mdoc_node *n;
 525         size_t            sv;
 526
 527         n = node_alloc(m, line, pos, -1, MDOC_TEXT);
 528         n->string = mandoc_malloc(len + 1);
 529         sv = strlcpy(n->string, p, len + 1);
 530
 531         /* Prohibit truncation. */
 532         assert(sv < len + 1);
 533
 534         if ( ! node_append(m, n))
 535                 return(0);
 536         m->next = MDOC_NEXT_SIBLING;
 537         return(1);
 538 }
 539
 540
 541 int
 542 mdoc_word_alloc(struct mdoc *m, int line, int pos, const char *p)
 543 {
 544
 545         return(pstring(m, line, pos, p, strlen(p)));
 546 }
 547
 548
 549 void
 550 mdoc_node_free(struct mdoc_node *p)
 551 {
 552
 553         if (p->parent)
 554                 p->parent->nchild--;
 555         if (p->string)
 556                 free(p->string);
 557         if (p->args)
 558                 mdoc_argv_free(p->args);
 559         free(p);
 560 }
 561
 562
 563 void
 564 mdoc_node_freelist(struct mdoc_node *p)
 565 {
 566
 567         if (p->child)
 568                 mdoc_node_freelist(p->child);
 569         if (p->next)
 570                 mdoc_node_freelist(p->next);
 571
 572         assert(0 == p->nchild);
 573         mdoc_node_free(p);
 574 }
 575
 576
 577 /*
 578  * Parse free-form text, that is, a line that does not begin with the
 579  * control character.
 580  */
 581 static int
 582 parsetext(struct mdoc *m, int line, char *buf)
 583 {
 584         int              i, j;
 585
 586         if (SEC_NONE == m->lastnamed)
 587                 return(mdoc_perr(m, line, 0, ETEXTPROL));
 588
 589         /*
 590          * If in literal mode, then pass the buffer directly to the
 591          * back-end, as it should be preserved as a single term.
 592          */
 593
 594         if (MDOC_LITERAL & m->flags)
 595                 return(mdoc_word_alloc(m, line, 0, buf));
 596
 597         /* Disallow blank/white-space lines in non-literal mode. */
 598
 599         for (i = 0; ' ' == buf[i]; i++)
 600                 /* Skip leading whitespace. */ ;
 601         if (0 == buf[i])
 602                 return(mdoc_perr(m, line, 0, ENOBLANK));
 603
 604         /*
 605          * Break apart a free-form line into tokens.  Spaces are
 606          * stripped out of the input.
 607          */
 608
 609         for (j = i; buf[i]; i++) {
 610                 if (' ' != buf[i])
 611                         continue;
 612
 613                 /* Escaped whitespace. */
 614                 if (i && ' ' == buf[i] && '\\' == buf[i - 1])
 615                         continue;
 616
 617                 buf[i++] = 0;
 618                 if ( ! pstring(m, line, j, &buf[j], (size_t)(i - j)))
 619                         return(0);
 620
 621                 for ( ; ' ' == buf[i]; i++)
 622                         /* Skip trailing whitespace. */ ;
 623
 624                 j = i;
 625                 if (0 == buf[i])
 626                         break;
 627         }
 628
 629         if (j != i && ! pstring(m, line, j, &buf[j], (size_t)(i - j)))
 630                 return(0);
 631
 632         m->next = MDOC_NEXT_SIBLING;
 633         return(1);
 634 }
 635
 636
 637
 638 static int
 639 macrowarn(struct mdoc *m, int ln, const char *buf)
 640 {
 641         if ( ! (MDOC_IGN_MACRO & m->pflags))
 642                 return(mdoc_verr(m, ln, 0,
 643                                 "unknown macro: %s%s",
 644                                 buf, strlen(buf) > 3 ? "..." : ""));
 645         return(mdoc_vwarn(m, ln, 0, "unknown macro: %s%s",
 646                                 buf, strlen(buf) > 3 ? "..." : ""));
 647 }
 648
 649
 650 /*
 651  * Parse a macro line, that is, a line beginning with the control
 652  * character.
 653  */
 654 int
 655 parsemacro(struct mdoc *m, int ln, char *buf)
 656 {
 657         int               i, j, c;
 658         char              mac[5];
 659
 660         /* Empty lines are ignored. */
 661
 662         if (0 == buf[1])
 663                 return(1);
 664
 665         i = 1;
 666
 667         /* Accept whitespace after the initial control char. */
 668
 669         if (' ' == buf[i]) {
 670                 i++;
 671                 while (buf[i] && ' ' == buf[i])
 672                         i++;
 673                 if (0 == buf[i])
 674                         return(1);
 675         }
 676
 677         /* Copy the first word into a nil-terminated buffer. */
 678
 679         for (j = 0; j < 4; j++, i++) {
 680                 if (0 == (mac[j] = buf[i]))
 681                         break;
 682                 else if (' ' == buf[i])
 683                         break;
 684
 685                 /* Check for invalid characters. */
 686
 687                 if (isgraph((u_char)buf[i]))
 688                         continue;
 689                 return(mdoc_perr(m, ln, i, EPRINT));
 690         }
 691
 692         mac[j] = 0;
 693
 694         if (j == 4 || j < 2) {
 695                 if ( ! macrowarn(m, ln, mac))
 696                         goto err;
 697                 return(1);
 698         }
 699
 700         if (MDOC_MAX == (c = mdoc_hash_find(mac))) {
 701                 if ( ! macrowarn(m, ln, mac))
 702                         goto err;
 703                 return(1);
 704         }
 705
 706         /* The macro is sane.  Jump to the next word. */
 707
 708         while (buf[i] && ' ' == buf[i])
 709                 i++;
 710
 711         /*
 712          * Begin recursive parse sequence.  Since we're at the start of
 713          * the line, we don't need to do callable/parseable checks.
 714          */
 715         if ( ! mdoc_macro(m, c, ln, 1, &i, buf))
 716                 goto err;
 717
 718         return(1);
 719
 720 err:    /* Error out. */
 721
 722         m->flags |= MDOC_HALT;
 723         return(0);
 724 }