man.c

   1 /*      $Id: man.c,v 1.50 2010/03/22 05:59:32 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 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #include <sys/types.h>
  22
  23 #include <assert.h>
  24 #include <ctype.h>
  25 #include <stdarg.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29
  30 #include "libman.h"
  31 #include "libmandoc.h"
  32
  33 const   char *const __man_merrnames[WERRMAX] = {
  34         "invalid character", /* WNPRINT */
  35         "invalid manual section", /* WMSEC */
  36         "invalid date format", /* WDATE */
  37         "scope of prior line violated", /* WLNSCOPE */
  38         "trailing whitespace", /* WTSPACE */
  39         "unterminated quoted parameter", /* WTQUOTE */
  40         "document has no body", /* WNODATA */
  41         "document has no title/section", /* WNOTITLE */
  42         "invalid escape sequence", /* WESCAPE */
  43         "invalid number format", /* WNUMFMT */
  44         "expected block head arguments", /* WHEADARGS */
  45         "expected block body arguments", /* WBODYARGS */
  46         "expected empty block head", /* WNHEADARGS */
  47         "ill-formed macro", /* WMACROFORM */
  48         "scope open on exit", /* WEXITSCOPE */
  49         "no scope context", /* WNOSCOPE */
  50         "literal context already open", /* WOLITERAL */
  51         "no literal context open" /* WNLITERAL */
  52 };
  53
  54 const   char *const __man_macronames[MAN_MAX] = {
  55         "br",           "TH",           "SH",           "SS",
  56         "TP",           "LP",           "PP",           "P",
  57         "IP",           "HP",           "SM",           "SB",
  58         "BI",           "IB",           "BR",           "RB",
  59         "R",            "B",            "I",            "IR",
  60         "RI",           "na",           "i",            "sp",
  61         "nf",           "fi",           "r",            "RE",
  62         "RS",           "DT",           "UC",           "PD"
  63         };
  64
  65 const   char * const *man_macronames = __man_macronames;
  66
  67 static  struct man_node *man_node_alloc(int, int,
  68                                 enum man_type, int);
  69 static  int              man_node_append(struct man *,
  70                                 struct man_node *);
  71 static  int              man_ptext(struct man *, int, char *);
  72 static  int              man_pmacro(struct man *, int, char *);
  73 static  void             man_free1(struct man *);
  74 static  void             man_alloc1(struct man *);
  75 static  int              pstring(struct man *, int, int,
  76                                 const char *, size_t);
  77 static  int              macrowarn(struct man *, int, const char *);
  78
  79
  80 const struct man_node *
  81 man_node(const struct man *m)
  82 {
  83
  84         return(MAN_HALT & m->flags ? NULL : m->first);
  85 }
  86
  87
  88 const struct man_meta *
  89 man_meta(const struct man *m)
  90 {
  91
  92         return(MAN_HALT & m->flags ? NULL : &m->meta);
  93 }
  94
  95
  96 void
  97 man_reset(struct man *man)
  98 {
  99
 100         man_free1(man);
 101         man_alloc1(man);
 102 }
 103
 104
 105 void
 106 man_free(struct man *man)
 107 {
 108
 109         man_free1(man);
 110         free(man);
 111 }
 112
 113
 114 struct man *
 115 man_alloc(void *data, int pflags, const struct man_cb *cb)
 116 {
 117         struct man      *p;
 118
 119         p = mandoc_calloc(1, sizeof(struct man));
 120
 121         if (cb)
 122                 memcpy(&p->cb, cb, sizeof(struct man_cb));
 123
 124         man_hash_init();
 125         p->data = data;
 126         p->pflags = pflags;
 127
 128         man_alloc1(p);
 129         return(p);
 130 }
 131
 132
 133 int
 134 man_endparse(struct man *m)
 135 {
 136
 137         if (MAN_HALT & m->flags)
 138                 return(0);
 139         else if (man_macroend(m))
 140                 return(1);
 141         m->flags |= MAN_HALT;
 142         return(0);
 143 }
 144
 145
 146 int
 147 man_parseln(struct man *m, int ln, char *buf)
 148 {
 149
 150         return('.' == *buf ?
 151                         man_pmacro(m, ln, buf) :
 152                         man_ptext(m, ln, buf));
 153 }
 154
 155
 156 static void
 157 man_free1(struct man *man)
 158 {
 159
 160         if (man->first)
 161                 man_node_freelist(man->first);
 162         if (man->meta.title)
 163                 free(man->meta.title);
 164         if (man->meta.source)
 165                 free(man->meta.source);
 166         if (man->meta.vol)
 167                 free(man->meta.vol);
 168 }
 169
 170
 171 static void
 172 man_alloc1(struct man *m)
 173 {
 174
 175         memset(&m->meta, 0, sizeof(struct man_meta));
 176         m->flags = 0;
 177         m->last = mandoc_calloc(1, sizeof(struct man_node));
 178         m->first = m->last;
 179         m->last->type = MAN_ROOT;
 180         m->next = MAN_NEXT_CHILD;
 181 }
 182
 183
 184 static int
 185 man_node_append(struct man *man, struct man_node *p)
 186 {
 187
 188         assert(man->last);
 189         assert(man->first);
 190         assert(MAN_ROOT != p->type);
 191
 192         switch (man->next) {
 193         case (MAN_NEXT_SIBLING):
 194                 man->last->next = p;
 195                 p->prev = man->last;
 196                 p->parent = man->last->parent;
 197                 break;
 198         case (MAN_NEXT_CHILD):
 199                 man->last->child = p;
 200                 p->parent = man->last;
 201                 break;
 202         default:
 203                 abort();
 204                 /* NOTREACHED */
 205         }
 206
 207         p->parent->nchild++;
 208
 209         if ( ! man_valid_pre(man, p))
 210                 return(0);
 211
 212         switch (p->type) {
 213         case (MAN_HEAD):
 214                 assert(MAN_BLOCK == p->parent->type);
 215                 p->parent->head = p;
 216                 break;
 217         case (MAN_BODY):
 218                 assert(MAN_BLOCK == p->parent->type);
 219                 p->parent->body = p;
 220                 break;
 221         default:
 222                 break;
 223         }
 224
 225         man->last = p;
 226
 227         switch (p->type) {
 228         case (MAN_TEXT):
 229                 if ( ! man_valid_post(man))
 230                         return(0);
 231                 if ( ! man_action_post(man))
 232                         return(0);
 233                 break;
 234         default:
 235                 break;
 236         }
 237
 238         return(1);
 239 }
 240
 241
 242 static struct man_node *
 243 man_node_alloc(int line, int pos, enum man_type type, int tok)
 244 {
 245         struct man_node *p;
 246
 247         p = mandoc_calloc(1, sizeof(struct man_node));
 248         p->line = line;
 249         p->pos = pos;
 250         p->type = type;
 251         p->tok = tok;
 252         return(p);
 253 }
 254
 255
 256 int
 257 man_elem_alloc(struct man *m, int line, int pos, int tok)
 258 {
 259         struct man_node *p;
 260
 261         p = man_node_alloc(line, pos, MAN_ELEM, tok);
 262         if ( ! man_node_append(m, p))
 263                 return(0);
 264         m->next = MAN_NEXT_CHILD;
 265         return(1);
 266 }
 267
 268
 269 int
 270 man_head_alloc(struct man *m, int line, int pos, int tok)
 271 {
 272         struct man_node *p;
 273
 274         p = man_node_alloc(line, pos, MAN_HEAD, tok);
 275         if ( ! man_node_append(m, p))
 276                 return(0);
 277         m->next = MAN_NEXT_CHILD;
 278         return(1);
 279 }
 280
 281
 282 int
 283 man_body_alloc(struct man *m, int line, int pos, int tok)
 284 {
 285         struct man_node *p;
 286
 287         p = man_node_alloc(line, pos, MAN_BODY, tok);
 288         if ( ! man_node_append(m, p))
 289                 return(0);
 290         m->next = MAN_NEXT_CHILD;
 291         return(1);
 292 }
 293
 294
 295 int
 296 man_block_alloc(struct man *m, int line, int pos, int tok)
 297 {
 298         struct man_node *p;
 299
 300         p = man_node_alloc(line, pos, MAN_BLOCK, tok);
 301         if ( ! man_node_append(m, p))
 302                 return(0);
 303         m->next = MAN_NEXT_CHILD;
 304         return(1);
 305 }
 306
 307
 308 static int
 309 pstring(struct man *m, int line, int pos,
 310                 const char *p, size_t len)
 311 {
 312         struct man_node *n;
 313         size_t           sv;
 314
 315         n = man_node_alloc(line, pos, MAN_TEXT, -1);
 316         n->string = mandoc_malloc(len + 1);
 317         sv = strlcpy(n->string, p, len + 1);
 318
 319         /* Prohibit truncation. */
 320         assert(sv < len + 1);
 321
 322         if ( ! man_node_append(m, n))
 323                 return(0);
 324         m->next = MAN_NEXT_SIBLING;
 325         return(1);
 326 }
 327
 328
 329 int
 330 man_word_alloc(struct man *m, int line, int pos, const char *word)
 331 {
 332
 333         return(pstring(m, line, pos, word, strlen(word)));
 334 }
 335
 336
 337 void
 338 man_node_free(struct man_node *p)
 339 {
 340
 341         if (p->string)
 342                 free(p->string);
 343         if (p->parent)
 344                 p->parent->nchild--;
 345         free(p);
 346 }
 347
 348
 349 void
 350 man_node_freelist(struct man_node *p)
 351 {
 352         struct man_node *n;
 353
 354         if (p->child)
 355                 man_node_freelist(p->child);
 356         assert(0 == p->nchild);
 357         n = p->next;
 358         man_node_free(p);
 359         if (n)
 360                 man_node_freelist(n);
 361 }
 362
 363
 364 static int
 365 man_ptext(struct man *m, int line, char *buf)
 366 {
 367         int              i, j;
 368         char             sv;
 369
 370         /* Literal free-form text whitespace is preserved. */
 371
 372         if (MAN_LITERAL & m->flags) {
 373                 if ( ! man_word_alloc(m, line, 0, buf))
 374                         return(0);
 375                 goto descope;
 376         }
 377
 378         /* First de-chunk and allocate words. */
 379
 380         for (i = 0; ' ' == buf[i]; i++)
 381                 /* Skip leading whitespace. */ ;
 382
 383         if ('\0' == buf[i]) {
 384                 /* Trailing whitespace? */
 385                 if (i && ' ' == buf[i - 1])
 386                         if ( ! man_pwarn(m, line, i - 1, WTSPACE))
 387                                 return(0);
 388                 if ( ! pstring(m, line, 0, &buf[i], 0))
 389                         return(0);
 390                 goto descope;
 391         }
 392
 393         for (j = i; buf[i]; i++) {
 394                 if (' ' != buf[i])
 395                         continue;
 396
 397                 /* Escaped whitespace. */
 398                 if (i && ' ' == buf[i] && '\\' == buf[i - 1])
 399                         continue;
 400
 401                 sv = buf[i];
 402                 buf[i++] = '\0';
 403
 404                 if ( ! pstring(m, line, j, &buf[j], (size_t)(i - j)))
 405                         return(0);
 406
 407                 /* Trailing whitespace?  Check at overwritten byte. */
 408
 409                 if (' ' == sv && '\0' == buf[i])
 410                         if ( ! man_pwarn(m, line, i - 1, WTSPACE))
 411                                 return(0);
 412
 413                 for ( ; ' ' == buf[i]; i++)
 414                         /* Skip trailing whitespace. */ ;
 415
 416                 j = i;
 417
 418                 /* Trailing whitespace? */
 419
 420                 if (' ' == buf[i - 1] && '\0' == buf[i])
 421                         if ( ! man_pwarn(m, line, i - 1, WTSPACE))
 422                                 return(0);
 423
 424                 if ('\0' == buf[i])
 425                         break;
 426         }
 427
 428         if (j != i && ! pstring(m, line, j, &buf[j], (size_t)(i - j)))
 429                 return(0);
 430
 431 descope:
 432
 433         /*
 434          * Co-ordinate what happens with having a next-line scope open:
 435          * first close out the element scope (if applicable), then close
 436          * out the block scope (also if applicable).
 437          */
 438
 439         if (MAN_ELINE & m->flags) {
 440                 m->flags &= ~MAN_ELINE;
 441                 if ( ! man_unscope(m, m->last->parent))
 442                         return(0);
 443         }
 444
 445         if ( ! (MAN_BLINE & m->flags))
 446                 return(1);
 447         m->flags &= ~MAN_BLINE;
 448
 449         if ( ! man_unscope(m, m->last->parent))
 450                 return(0);
 451         return(man_body_alloc(m, line, 0, m->last->tok));
 452 }
 453
 454
 455 static int
 456 macrowarn(struct man *m, int ln, const char *buf)
 457 {
 458         if ( ! (MAN_IGN_MACRO & m->pflags))
 459                 return(man_verr(m, ln, 0,
 460                                 "unknown macro: %s%s",
 461                                 buf, strlen(buf) > 3 ? "..." : ""));
 462         return(man_vwarn(m, ln, 0, "unknown macro: %s%s",
 463                                 buf, strlen(buf) > 3 ? "..." : ""));
 464 }
 465
 466
 467 int
 468 man_pmacro(struct man *m, int ln, char *buf)
 469 {
 470         int              i, j, c, ppos, fl;
 471         char             mac[5];
 472         struct man_node *n;
 473
 474         /* Comments and empties are quickly ignored. */
 475
 476         fl = m->flags;
 477
 478         if ('\0' == buf[1])
 479                 return(1);
 480
 481         i = 1;
 482
 483         if (' ' == buf[i]) {
 484                 i++;
 485                 while (buf[i] && ' ' == buf[i])
 486                         i++;
 487                 if ('\0' == buf[i])
 488                         goto out;
 489         }
 490
 491         ppos = i;
 492
 493         /* Copy the first word into a nil-terminated buffer. */
 494
 495         for (j = 0; j < 4; j++, i++) {
 496                 if ('\0' == (mac[j] = buf[i]))
 497                         break;
 498                 else if (' ' == buf[i])
 499                         break;
 500
 501                 /* Check for invalid characters. */
 502
 503                 if (isgraph((u_char)buf[i]))
 504                         continue;
 505                 return(man_perr(m, ln, i, WNPRINT));
 506         }
 507
 508         mac[j] = '\0';
 509
 510         if (j == 4 || j < 1) {
 511                 if ( ! (MAN_IGN_MACRO & m->pflags)) {
 512                         (void)man_perr(m, ln, ppos, WMACROFORM);
 513                         goto err;
 514                 }
 515                 if ( ! man_pwarn(m, ln, ppos, WMACROFORM))
 516                         goto err;
 517                 return(1);
 518         }
 519
 520         if (MAN_MAX == (c = man_hash_find(mac))) {
 521                 if ( ! macrowarn(m, ln, mac))
 522                         goto err;
 523                 return(1);
 524         }
 525
 526         /* The macro is sane.  Jump to the next word. */
 527
 528         while (buf[i] && ' ' == buf[i])
 529                 i++;
 530
 531         /* Trailing whitespace? */
 532
 533         if ('\0' == buf[i] && ' ' == buf[i - 1])
 534                 if ( ! man_pwarn(m, ln, i - 1, WTSPACE))
 535                         goto err;
 536
 537         /*
 538          * Remove prior ELINE macro, as a macro is clobbering it by
 539          * being invoked without prior text.  Note that NSCOPED macros
 540          * do not close out ELINE macros, as they print no text.
 541          */
 542
 543         if (m->flags & MAN_ELINE &&
 544                         ! (MAN_NSCOPED & man_macros[c].flags)) {
 545                 n = m->last;
 546                 assert(NULL == n->child);
 547                 assert(0 == n->nchild);
 548                 if ( ! man_nwarn(m, n, WLNSCOPE))
 549                         return(0);
 550
 551                 /* FIXME: when called as in:
 552                  *
 553                  * .B
 554                  * .br
 555                  * .B
 556                  * .br
 557                  * hello
 558                  */
 559
 560                 if (n->prev) {
 561                         assert(n != n->parent->child);
 562                         assert(n == n->prev->next);
 563                         n->prev->next = NULL;
 564                         m->last = n->prev;
 565                         m->next = MAN_NEXT_SIBLING;
 566                 } else {
 567                         assert(n == n->parent->child);
 568                         n->parent->child = NULL;
 569                         m->last = n->parent;
 570                         m->next = MAN_NEXT_CHILD;
 571                 }
 572
 573                 man_node_free(n);
 574                 m->flags &= ~MAN_ELINE;
 575         }
 576
 577         /* Begin recursive parse sequence. */
 578
 579         assert(man_macros[c].fp);
 580
 581         if ( ! (*man_macros[c].fp)(m, c, ln, ppos, &i, buf))
 582                 goto err;
 583
 584 out:
 585         /*
 586          * We weren't in a block-line scope when entering the
 587          * above-parsed macro, so return.
 588          */
 589
 590         if ( ! (MAN_BLINE & fl)) {
 591                 m->flags &= ~MAN_ILINE;
 592                 return(1);
 593         }
 594
 595         /*
 596          * If we're in a block scope, then allow this macro to slip by
 597          * without closing scope around it.
 598          */
 599
 600         if (MAN_ILINE & m->flags) {
 601                 m->flags &= ~MAN_ILINE;
 602                 return(1);
 603         }
 604
 605         /*
 606          * If we've opened a new next-line element scope, then return
 607          * now, as the next line will close out the block scope.
 608          */
 609
 610         if (MAN_ELINE & m->flags)
 611                 return(1);
 612
 613         /* Close out the block scope opened in the prior line.  */
 614
 615         assert(MAN_BLINE & m->flags);
 616         m->flags &= ~MAN_BLINE;
 617
 618         if ( ! man_unscope(m, m->last->parent))
 619                 return(0);
 620         return(man_body_alloc(m, ln, 0, m->last->tok));
 621
 622 err:    /* Error out. */
 623
 624         m->flags |= MAN_HALT;
 625         return(0);
 626 }
 627
 628
 629 int
 630 man_verr(struct man *man, int ln, int pos, const char *fmt, ...)
 631 {
 632         char             buf[256];
 633         va_list          ap;
 634
 635         if (NULL == man->cb.man_err)
 636                 return(0);
 637
 638         va_start(ap, fmt);
 639         (void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 640         va_end(ap);
 641         return((*man->cb.man_err)(man->data, ln, pos, buf));
 642 }
 643
 644
 645 int
 646 man_vwarn(struct man *man, int ln, int pos, const char *fmt, ...)
 647 {
 648         char             buf[256];
 649         va_list          ap;
 650
 651         if (NULL == man->cb.man_warn)
 652                 return(0);
 653
 654         va_start(ap, fmt);
 655         (void)vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 656         va_end(ap);
 657         return((*man->cb.man_warn)(man->data, ln, pos, buf));
 658 }
 659
 660
 661 int
 662 man_err(struct man *m, int line, int pos, int iserr, enum merr type)
 663 {
 664         const char       *p;
 665
 666         p = __man_merrnames[(int)type];
 667         assert(p);
 668
 669         if (iserr)
 670                 return(man_verr(m, line, pos, p));
 671
 672         return(man_vwarn(m, line, pos, p));
 673 }