mandoc.c

   1 /*      $Id: mandoc.c,v 1.88 2014/10/28 13:24:44 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2011, 2012, 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include "config.h"
  19
  20 #include <sys/types.h>
  21
  22 #include <assert.h>
  23 #include <ctype.h>
  24 #include <errno.h>
  25 #include <limits.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <time.h>
  30
  31 #include "mandoc.h"
  32 #include "mandoc_aux.h"
  33 #include "libmandoc.h"
  34
  35 #define DATESIZE 32
  36
  37 static  int      a2time(time_t *, const char *, const char *);
  38 static  char    *time2a(time_t);
  39
  40
  41 enum mandoc_esc
  42 mandoc_escape(const char **end, const char **start, int *sz)
  43 {
  44         const char      *local_start;
  45         int              local_sz;
  46         char             term;
  47         enum mandoc_esc  gly;
  48
  49         /*
  50          * When the caller doesn't provide return storage,
  51          * use local storage.
  52          */
  53
  54         if (NULL == start)
  55                 start = &local_start;
  56         if (NULL == sz)
  57                 sz = &local_sz;
  58
  59         /*
  60          * Beyond the backslash, at least one input character
  61          * is part of the escape sequence.  With one exception
  62          * (see below), that character won't be returned.
  63          */
  64
  65         gly = ESCAPE_ERROR;
  66         *start = ++*end;
  67         *sz = 0;
  68         term = '\0';
  69
  70         switch ((*start)[-1]) {
  71         /*
  72          * First the glyphs.  There are several different forms of
  73          * these, but each eventually returns a substring of the glyph
  74          * name.
  75          */
  76         case '(':
  77                 gly = ESCAPE_SPECIAL;
  78                 *sz = 2;
  79                 break;
  80         case '[':
  81                 gly = ESCAPE_SPECIAL;
  82                 term = ']';
  83                 break;
  84         case 'C':
  85                 if ('\'' != **start)
  86                         return(ESCAPE_ERROR);
  87                 *start = ++*end;
  88                 gly = ESCAPE_SPECIAL;
  89                 term = '\'';
  90                 break;
  91
  92         /*
  93          * Escapes taking no arguments at all.
  94          */
  95         case 'd':
  96                 /* FALLTHROUGH */
  97         case 'u':
  98                 return(ESCAPE_IGNORE);
  99
 100         /*
 101          * The \z escape is supposed to output the following
 102          * character without advancing the cursor position.
 103          * Since we are mostly dealing with terminal mode,
 104          * let us just skip the next character.
 105          */
 106         case 'z':
 107                 return(ESCAPE_SKIPCHAR);
 108
 109         /*
 110          * Handle all triggers matching \X(xy, \Xx, and \X[xxxx], where
 111          * 'X' is the trigger.  These have opaque sub-strings.
 112          */
 113         case 'F':
 114                 /* FALLTHROUGH */
 115         case 'g':
 116                 /* FALLTHROUGH */
 117         case 'k':
 118                 /* FALLTHROUGH */
 119         case 'M':
 120                 /* FALLTHROUGH */
 121         case 'm':
 122                 /* FALLTHROUGH */
 123         case 'n':
 124                 /* FALLTHROUGH */
 125         case 'V':
 126                 /* FALLTHROUGH */
 127         case 'Y':
 128                 gly = ESCAPE_IGNORE;
 129                 /* FALLTHROUGH */
 130         case 'f':
 131                 if (ESCAPE_ERROR == gly)
 132                         gly = ESCAPE_FONT;
 133                 switch (**start) {
 134                 case '(':
 135                         *start = ++*end;
 136                         *sz = 2;
 137                         break;
 138                 case '[':
 139                         *start = ++*end;
 140                         term = ']';
 141                         break;
 142                 default:
 143                         *sz = 1;
 144                         break;
 145                 }
 146                 break;
 147
 148         /*
 149          * These escapes are of the form \X'Y', where 'X' is the trigger
 150          * and 'Y' is any string.  These have opaque sub-strings.
 151          * The \B and \w escapes are handled in roff.c, roff_res().
 152          */
 153         case 'A':
 154                 /* FALLTHROUGH */
 155         case 'b':
 156                 /* FALLTHROUGH */
 157         case 'D':
 158                 /* FALLTHROUGH */
 159         case 'o':
 160                 /* FALLTHROUGH */
 161         case 'R':
 162                 /* FALLTHROUGH */
 163         case 'X':
 164                 /* FALLTHROUGH */
 165         case 'Z':
 166                 if ('\0' == **start)
 167                         return(ESCAPE_ERROR);
 168                 gly = ESCAPE_IGNORE;
 169                 term = **start;
 170                 *start = ++*end;
 171                 break;
 172
 173         /*
 174          * These escapes are of the form \X'N', where 'X' is the trigger
 175          * and 'N' resolves to a numerical expression.
 176          */
 177         case 'h':
 178                 /* FALLTHROUGH */
 179         case 'H':
 180                 /* FALLTHROUGH */
 181         case 'L':
 182                 /* FALLTHROUGH */
 183         case 'l':
 184                 /* FALLTHROUGH */
 185         case 'S':
 186                 /* FALLTHROUGH */
 187         case 'v':
 188                 /* FALLTHROUGH */
 189         case 'x':
 190                 if (strchr(" %&()*+-./0123456789:<=>", **start)) {
 191                         if ('\0' != **start)
 192                                 ++*end;
 193                         return(ESCAPE_ERROR);
 194                 }
 195                 gly = ESCAPE_IGNORE;
 196                 term = **start;
 197                 *start = ++*end;
 198                 break;
 199
 200         /*
 201          * Special handling for the numbered character escape.
 202          * XXX Do any other escapes need similar handling?
 203          */
 204         case 'N':
 205                 if ('\0' == **start)
 206                         return(ESCAPE_ERROR);
 207                 (*end)++;
 208                 if (isdigit((unsigned char)**start)) {
 209                         *sz = 1;
 210                         return(ESCAPE_IGNORE);
 211                 }
 212                 (*start)++;
 213                 while (isdigit((unsigned char)**end))
 214                         (*end)++;
 215                 *sz = *end - *start;
 216                 if ('\0' != **end)
 217                         (*end)++;
 218                 return(ESCAPE_NUMBERED);
 219
 220         /*
 221          * Sizes get a special category of their own.
 222          */
 223         case 's':
 224                 gly = ESCAPE_IGNORE;
 225
 226                 /* See +/- counts as a sign. */
 227                 if ('+' == **end || '-' == **end || ASCII_HYPH == **end)
 228                         (*end)++;
 229
 230                 switch (**end) {
 231                 case '(':
 232                         *start = ++*end;
 233                         *sz = 2;
 234                         break;
 235                 case '[':
 236                         *start = ++*end;
 237                         term = ']';
 238                         break;
 239                 case '\'':
 240                         *start = ++*end;
 241                         term = '\'';
 242                         break;
 243                 default:
 244                         *sz = 1;
 245                         break;
 246                 }
 247
 248                 break;
 249
 250         /*
 251          * Anything else is assumed to be a glyph.
 252          * In this case, pass back the character after the backslash.
 253          */
 254         default:
 255                 gly = ESCAPE_SPECIAL;
 256                 *start = --*end;
 257                 *sz = 1;
 258                 break;
 259         }
 260
 261         assert(ESCAPE_ERROR != gly);
 262
 263         /*
 264          * Read up to the terminating character,
 265          * paying attention to nested escapes.
 266          */
 267
 268         if ('\0' != term) {
 269                 while (**end != term) {
 270                         switch (**end) {
 271                         case '\0':
 272                                 return(ESCAPE_ERROR);
 273                         case '\\':
 274                                 (*end)++;
 275                                 if (ESCAPE_ERROR ==
 276                                     mandoc_escape(end, NULL, NULL))
 277                                         return(ESCAPE_ERROR);
 278                                 break;
 279                         default:
 280                                 (*end)++;
 281                                 break;
 282                         }
 283                 }
 284                 *sz = (*end)++ - *start;
 285         } else {
 286                 assert(*sz > 0);
 287                 if ((size_t)*sz > strlen(*start))
 288                         return(ESCAPE_ERROR);
 289                 *end += *sz;
 290         }
 291
 292         /* Run post-processors. */
 293
 294         switch (gly) {
 295         case ESCAPE_FONT:
 296                 if (2 == *sz) {
 297                         if ('C' == **start) {
 298                                 /*
 299                                  * Treat constant-width font modes
 300                                  * just like regular font modes.
 301                                  */
 302                                 (*start)++;
 303                                 (*sz)--;
 304                         } else {
 305                                 if ('B' == (*start)[0] && 'I' == (*start)[1])
 306                                         gly = ESCAPE_FONTBI;
 307                                 break;
 308                         }
 309                 } else if (1 != *sz)
 310                         break;
 311
 312                 switch (**start) {
 313                 case '3':
 314                         /* FALLTHROUGH */
 315                 case 'B':
 316                         gly = ESCAPE_FONTBOLD;
 317                         break;
 318                 case '2':
 319                         /* FALLTHROUGH */
 320                 case 'I':
 321                         gly = ESCAPE_FONTITALIC;
 322                         break;
 323                 case 'P':
 324                         gly = ESCAPE_FONTPREV;
 325                         break;
 326                 case '1':
 327                         /* FALLTHROUGH */
 328                 case 'R':
 329                         gly = ESCAPE_FONTROMAN;
 330                         break;
 331                 }
 332                 break;
 333         case ESCAPE_SPECIAL:
 334                 if (1 == *sz && 'c' == **start)
 335                         gly = ESCAPE_NOSPACE;
 336                 /*
 337                  * Unicode escapes are defined in groff as \[u0000]
 338                  * to \[u10FFFF], where the contained value must be
 339                  * a valid Unicode codepoint.  Here, however, only
 340                  * check the length and range.
 341                  */
 342                 if (**start != 'u' || *sz < 5 || *sz > 7)
 343                         break;
 344                 if (*sz == 7 && ((*start)[1] != '1' || (*start)[2] != '0'))
 345                         break;
 346                 if (*sz == 6 && (*start)[1] == '0')
 347                         break;
 348                 if ((int)strspn(*start + 1, "0123456789ABCDEFabcdef")
 349                     + 1 == *sz)
 350                         gly = ESCAPE_UNICODE;
 351                 break;
 352         default:
 353                 break;
 354         }
 355
 356         return(gly);
 357 }
 358
 359 /*
 360  * Parse a quoted or unquoted roff-style request or macro argument.
 361  * Return a pointer to the parsed argument, which is either the original
 362  * pointer or advanced by one byte in case the argument is quoted.
 363  * NUL-terminate the argument in place.
 364  * Collapse pairs of quotes inside quoted arguments.
 365  * Advance the argument pointer to the next argument,
 366  * or to the NUL byte terminating the argument line.
 367  */
 368 char *
 369 mandoc_getarg(struct mparse *parse, char **cpp, int ln, int *pos)
 370 {
 371         char     *start, *cp;
 372         int       quoted, pairs, white;
 373
 374         /* Quoting can only start with a new word. */
 375         start = *cpp;
 376         quoted = 0;
 377         if ('"' == *start) {
 378                 quoted = 1;
 379                 start++;
 380         }
 381
 382         pairs = 0;
 383         white = 0;
 384         for (cp = start; '\0' != *cp; cp++) {
 385
 386                 /*
 387                  * Move the following text left
 388                  * after quoted quotes and after "\\" and "\t".
 389                  */
 390                 if (pairs)
 391                         cp[-pairs] = cp[0];
 392
 393                 if ('\\' == cp[0]) {
 394                         /*
 395                          * In copy mode, translate double to single
 396                          * backslashes and backslash-t to literal tabs.
 397                          */
 398                         switch (cp[1]) {
 399                         case 't':
 400                                 cp[0] = '\t';
 401                                 /* FALLTHROUGH */
 402                         case '\\':
 403                                 pairs++;
 404                                 cp++;
 405                                 break;
 406                         case ' ':
 407                                 /* Skip escaped blanks. */
 408                                 if (0 == quoted)
 409                                         cp++;
 410                                 break;
 411                         default:
 412                                 break;
 413                         }
 414                 } else if (0 == quoted) {
 415                         if (' ' == cp[0]) {
 416                                 /* Unescaped blanks end unquoted args. */
 417                                 white = 1;
 418                                 break;
 419                         }
 420                 } else if ('"' == cp[0]) {
 421                         if ('"' == cp[1]) {
 422                                 /* Quoted quotes collapse. */
 423                                 pairs++;
 424                                 cp++;
 425                         } else {
 426                                 /* Unquoted quotes end quoted args. */
 427                                 quoted = 2;
 428                                 break;
 429                         }
 430                 }
 431         }
 432
 433         /* Quoted argument without a closing quote. */
 434         if (1 == quoted)
 435                 mandoc_msg(MANDOCERR_ARG_QUOTE, parse, ln, *pos, NULL);
 436
 437         /* NUL-terminate this argument and move to the next one. */
 438         if (pairs)
 439                 cp[-pairs] = '\0';
 440         if ('\0' != *cp) {
 441                 *cp++ = '\0';
 442                 while (' ' == *cp)
 443                         cp++;
 444         }
 445         *pos += (int)(cp - start) + (quoted ? 1 : 0);
 446         *cpp = cp;
 447
 448         if ('\0' == *cp && (white || ' ' == cp[-1]))
 449                 mandoc_msg(MANDOCERR_SPACE_EOL, parse, ln, *pos, NULL);
 450
 451         return(start);
 452 }
 453
 454 static int
 455 a2time(time_t *t, const char *fmt, const char *p)
 456 {
 457         struct tm        tm;
 458         char            *pp;
 459
 460         memset(&tm, 0, sizeof(struct tm));
 461
 462         pp = NULL;
 463 #if HAVE_STRPTIME
 464         pp = strptime(p, fmt, &tm);
 465 #endif
 466         if (NULL != pp && '\0' == *pp) {
 467                 *t = mktime(&tm);
 468                 return(1);
 469         }
 470
 471         return(0);
 472 }
 473
 474 static char *
 475 time2a(time_t t)
 476 {
 477         struct tm       *tm;
 478         char            *buf, *p;
 479         size_t           ssz;
 480         int              isz;
 481
 482         tm = localtime(&t);
 483
 484         /*
 485          * Reserve space:
 486          * up to 9 characters for the month (September) + blank
 487          * up to 2 characters for the day + comma + blank
 488          * 4 characters for the year and a terminating '\0'
 489          */
 490         p = buf = mandoc_malloc(10 + 4 + 4 + 1);
 491
 492         if (0 == (ssz = strftime(p, 10 + 1, "%B ", tm)))
 493                 goto fail;
 494         p += (int)ssz;
 495
 496         if (-1 == (isz = snprintf(p, 4 + 1, "%d, ", tm->tm_mday)))
 497                 goto fail;
 498         p += isz;
 499
 500         if (0 == strftime(p, 4 + 1, "%Y", tm))
 501                 goto fail;
 502         return(buf);
 503
 504 fail:
 505         free(buf);
 506         return(NULL);
 507 }
 508
 509 char *
 510 mandoc_normdate(struct mparse *parse, char *in, int ln, int pos)
 511 {
 512         char            *out;
 513         time_t           t;
 514
 515         if (NULL == in || '\0' == *in ||
 516             0 == strcmp(in, "$" "Mdocdate$")) {
 517                 mandoc_msg(MANDOCERR_DATE_MISSING, parse, ln, pos, NULL);
 518                 time(&t);
 519         }
 520         else if (a2time(&t, "%Y-%m-%d", in))
 521                 t = 0;
 522         else if (!a2time(&t, "$" "Mdocdate: %b %d %Y $", in) &&
 523             !a2time(&t, "%b %d, %Y", in)) {
 524                 mandoc_msg(MANDOCERR_DATE_BAD, parse, ln, pos, in);
 525                 t = 0;
 526         }
 527         out = t ? time2a(t) : NULL;
 528         return(out ? out : mandoc_strdup(in));
 529 }
 530
 531 int
 532 mandoc_eos(const char *p, size_t sz)
 533 {
 534         const char      *q;
 535         int              enclosed, found;
 536
 537         if (0 == sz)
 538                 return(0);
 539
 540         /*
 541          * End-of-sentence recognition must include situations where
 542          * some symbols, such as `)', allow prior EOS punctuation to
 543          * propagate outward.
 544          */
 545
 546         enclosed = found = 0;
 547         for (q = p + (int)sz - 1; q >= p; q--) {
 548                 switch (*q) {
 549                 case '\"':
 550                         /* FALLTHROUGH */
 551                 case '\'':
 552                         /* FALLTHROUGH */
 553                 case ']':
 554                         /* FALLTHROUGH */
 555                 case ')':
 556                         if (0 == found)
 557                                 enclosed = 1;
 558                         break;
 559                 case '.':
 560                         /* FALLTHROUGH */
 561                 case '!':
 562                         /* FALLTHROUGH */
 563                 case '?':
 564                         found = 1;
 565                         break;
 566                 default:
 567                         return(found && (!enclosed || isalnum((unsigned char)*q)));
 568                 }
 569         }
 570
 571         return(found && !enclosed);
 572 }
 573
 574 /*
 575  * Convert a string to a long that may not be <0.
 576  * If the string is invalid, or is less than 0, return -1.
 577  */
 578 int
 579 mandoc_strntoi(const char *p, size_t sz, int base)
 580 {
 581         char             buf[32];
 582         char            *ep;
 583         long             v;
 584
 585         if (sz > 31)
 586                 return(-1);
 587
 588         memcpy(buf, p, sz);
 589         buf[(int)sz] = '\0';
 590
 591         errno = 0;
 592         v = strtol(buf, &ep, base);
 593
 594         if (buf[0] == '\0' || *ep != '\0')
 595                 return(-1);
 596
 597         if (v > INT_MAX)
 598                 v = INT_MAX;
 599         if (v < INT_MIN)
 600                 v = INT_MIN;
 601
 602         return((int)v);
 603 }