usr/src/cmd/mandoc/mandoc.c

   1 /*      $Id: mandoc.c,v 1.98 2015/11/12 22:44:27 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2011-2015 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 static  int      a2time(time_t *, const char *, const char *);
  36 static  char    *time2a(time_t);
  37
  38
  39 enum mandoc_esc
  40 mandoc_escape(const char **end, const char **start, int *sz)
  41 {
  42         const char      *local_start;
  43         int              local_sz;
  44         char             term;
  45         enum mandoc_esc  gly;
  46
  47         /*
  48          * When the caller doesn't provide return storage,
  49          * use local storage.
  50          */
  51
  52         if (NULL == start)
  53                 start = &local_start;
  54         if (NULL == sz)
  55                 sz = &local_sz;
  56
  57         /*
  58          * Beyond the backslash, at least one input character
  59          * is part of the escape sequence.  With one exception
  60          * (see below), that character won't be returned.
  61          */
  62
  63         gly = ESCAPE_ERROR;
  64         *start = ++*end;
  65         *sz = 0;
  66         term = '\0';
  67
  68         switch ((*start)[-1]) {
  69         /*
  70          * First the glyphs.  There are several different forms of
  71          * these, but each eventually returns a substring of the glyph
  72          * name.
  73          */
  74         case '(':
  75                 gly = ESCAPE_SPECIAL;
  76                 *sz = 2;
  77                 break;
  78         case '[':
  79                 gly = ESCAPE_SPECIAL;
  80                 term = ']';
  81                 break;
  82         case 'C':
  83                 if ('\'' != **start)
  84                         return ESCAPE_ERROR;
  85                 *start = ++*end;
  86                 gly = ESCAPE_SPECIAL;
  87                 term = '\'';
  88                 break;
  89
  90         /*
  91          * Escapes taking no arguments at all.
  92          */
  93         case 'd':
  94         case 'u':
  95         case ',':
  96         case '/':
  97                 return ESCAPE_IGNORE;
  98
  99         /*
 100          * The \z escape is supposed to output the following
 101          * character without advancing the cursor position.
 102          * Since we are mostly dealing with terminal mode,
 103          * let us just skip the next character.
 104          */
 105         case 'z':
 106                 return ESCAPE_SKIPCHAR;
 107
 108         /*
 109          * Handle all triggers matching \X(xy, \Xx, and \X[xxxx], where
 110          * 'X' is the trigger.  These have opaque sub-strings.
 111          */
 112         case 'F':
 113         case 'g':
 114         case 'k':
 115         case 'M':
 116         case 'm':
 117         case 'n':
 118         case 'V':
 119         case 'Y':
 120                 gly = ESCAPE_IGNORE;
 121                 /* FALLTHROUGH */
 122         case 'f':
 123                 if (ESCAPE_ERROR == gly)
 124                         gly = ESCAPE_FONT;
 125                 switch (**start) {
 126                 case '(':
 127                         *start = ++*end;
 128                         *sz = 2;
 129                         break;
 130                 case '[':
 131                         *start = ++*end;
 132                         term = ']';
 133                         break;
 134                 default:
 135                         *sz = 1;
 136                         break;
 137                 }
 138                 break;
 139
 140         /*
 141          * These escapes are of the form \X'Y', where 'X' is the trigger
 142          * and 'Y' is any string.  These have opaque sub-strings.
 143          * The \B and \w escapes are handled in roff.c, roff_res().
 144          */
 145         case 'A':
 146         case 'b':
 147         case 'D':
 148         case 'R':
 149         case 'X':
 150         case 'Z':
 151                 gly = ESCAPE_IGNORE;
 152                 /* FALLTHROUGH */
 153         case 'o':
 154                 if (**start == '\0')
 155                         return ESCAPE_ERROR;
 156                 if (gly == ESCAPE_ERROR)
 157                         gly = ESCAPE_OVERSTRIKE;
 158                 term = **start;
 159                 *start = ++*end;
 160                 break;
 161
 162         /*
 163          * These escapes are of the form \X'N', where 'X' is the trigger
 164          * and 'N' resolves to a numerical expression.
 165          */
 166         case 'h':
 167         case 'H':
 168         case 'L':
 169         case 'l':
 170         case 'S':
 171         case 'v':
 172         case 'x':
 173                 if (strchr(" %&()*+-./0123456789:<=>", **start)) {
 174                         if ('\0' != **start)
 175                                 ++*end;
 176                         return ESCAPE_ERROR;
 177                 }
 178                 gly = ESCAPE_IGNORE;
 179                 term = **start;
 180                 *start = ++*end;
 181                 break;
 182
 183         /*
 184          * Special handling for the numbered character escape.
 185          * XXX Do any other escapes need similar handling?
 186          */
 187         case 'N':
 188                 if ('\0' == **start)
 189                         return ESCAPE_ERROR;
 190                 (*end)++;
 191                 if (isdigit((unsigned char)**start)) {
 192                         *sz = 1;
 193                         return ESCAPE_IGNORE;
 194                 }
 195                 (*start)++;
 196                 while (isdigit((unsigned char)**end))
 197                         (*end)++;
 198                 *sz = *end - *start;
 199                 if ('\0' != **end)
 200                         (*end)++;
 201                 return ESCAPE_NUMBERED;
 202
 203         /*
 204          * Sizes get a special category of their own.
 205          */
 206         case 's':
 207                 gly = ESCAPE_IGNORE;
 208
 209                 /* See +/- counts as a sign. */
 210                 if ('+' == **end || '-' == **end || ASCII_HYPH == **end)
 211                         *start = ++*end;
 212
 213                 switch (**end) {
 214                 case '(':
 215                         *start = ++*end;
 216                         *sz = 2;
 217                         break;
 218                 case '[':
 219                         *start = ++*end;
 220                         term = ']';
 221                         break;
 222                 case '\'':
 223                         *start = ++*end;
 224                         term = '\'';
 225                         break;
 226                 case '3':
 227                 case '2':
 228                 case '1':
 229                         *sz = (*end)[-1] == 's' &&
 230                             isdigit((unsigned char)(*end)[1]) ? 2 : 1;
 231                         break;
 232                 default:
 233                         *sz = 1;
 234                         break;
 235                 }
 236
 237                 break;
 238
 239         /*
 240          * Anything else is assumed to be a glyph.
 241          * In this case, pass back the character after the backslash.
 242          */
 243         default:
 244                 gly = ESCAPE_SPECIAL;
 245                 *start = --*end;
 246                 *sz = 1;
 247                 break;
 248         }
 249
 250         assert(ESCAPE_ERROR != gly);
 251
 252         /*
 253          * Read up to the terminating character,
 254          * paying attention to nested escapes.
 255          */
 256
 257         if ('\0' != term) {
 258                 while (**end != term) {
 259                         switch (**end) {
 260                         case '\0':
 261                                 return ESCAPE_ERROR;
 262                         case '\\':
 263                                 (*end)++;
 264                                 if (ESCAPE_ERROR ==
 265                                     mandoc_escape(end, NULL, NULL))
 266                                         return ESCAPE_ERROR;
 267                                 break;
 268                         default:
 269                                 (*end)++;
 270                                 break;
 271                         }
 272                 }
 273                 *sz = (*end)++ - *start;
 274         } else {
 275                 assert(*sz > 0);
 276                 if ((size_t)*sz > strlen(*start))
 277                         return ESCAPE_ERROR;
 278                 *end += *sz;
 279         }
 280
 281         /* Run post-processors. */
 282
 283         switch (gly) {
 284         case ESCAPE_FONT:
 285                 if (2 == *sz) {
 286                         if ('C' == **start) {
 287                                 /*
 288                                  * Treat constant-width font modes
 289                                  * just like regular font modes.
 290                                  */
 291                                 (*start)++;
 292                                 (*sz)--;
 293                         } else {
 294                                 if ('B' == (*start)[0] && 'I' == (*start)[1])
 295                                         gly = ESCAPE_FONTBI;
 296                                 break;
 297                         }
 298                 } else if (1 != *sz)
 299                         break;
 300
 301                 switch (**start) {
 302                 case '3':
 303                 case 'B':
 304                         gly = ESCAPE_FONTBOLD;
 305                         break;
 306                 case '2':
 307                 case 'I':
 308                         gly = ESCAPE_FONTITALIC;
 309                         break;
 310                 case 'P':
 311                         gly = ESCAPE_FONTPREV;
 312                         break;
 313                 case '1':
 314                 case 'R':
 315                         gly = ESCAPE_FONTROMAN;
 316                         break;
 317                 }
 318                 break;
 319         case ESCAPE_SPECIAL:
 320                 if (1 == *sz && 'c' == **start)
 321                         gly = ESCAPE_NOSPACE;
 322                 /*
 323                  * Unicode escapes are defined in groff as \[u0000]
 324                  * to \[u10FFFF], where the contained value must be
 325                  * a valid Unicode codepoint.  Here, however, only
 326                  * check the length and range.
 327                  */
 328                 if (**start != 'u' || *sz < 5 || *sz > 7)
 329                         break;
 330                 if (*sz == 7 && ((*start)[1] != '1' || (*start)[2] != '0'))
 331                         break;
 332                 if (*sz == 6 && (*start)[1] == '0')
 333                         break;
 334                 if (*sz == 5 && (*start)[1] == 'D' &&
 335                     strchr("89ABCDEF", (*start)[2]) != NULL)
 336                         break;
 337                 if ((int)strspn(*start + 1, "0123456789ABCDEFabcdef")
 338                     + 1 == *sz)
 339                         gly = ESCAPE_UNICODE;
 340                 break;
 341         default:
 342                 break;
 343         }
 344
 345         return gly;
 346 }
 347
 348 /*
 349  * Parse a quoted or unquoted roff-style request or macro argument.
 350  * Return a pointer to the parsed argument, which is either the original
 351  * pointer or advanced by one byte in case the argument is quoted.
 352  * NUL-terminate the argument in place.
 353  * Collapse pairs of quotes inside quoted arguments.
 354  * Advance the argument pointer to the next argument,
 355  * or to the NUL byte terminating the argument line.
 356  */
 357 char *
 358 mandoc_getarg(struct mparse *parse, char **cpp, int ln, int *pos)
 359 {
 360         char     *start, *cp;
 361         int       quoted, pairs, white;
 362
 363         /* Quoting can only start with a new word. */
 364         start = *cpp;
 365         quoted = 0;
 366         if ('"' == *start) {
 367                 quoted = 1;
 368                 start++;
 369         }
 370
 371         pairs = 0;
 372         white = 0;
 373         for (cp = start; '\0' != *cp; cp++) {
 374
 375                 /*
 376                  * Move the following text left
 377                  * after quoted quotes and after "\\" and "\t".
 378                  */
 379                 if (pairs)
 380                         cp[-pairs] = cp[0];
 381
 382                 if ('\\' == cp[0]) {
 383                         /*
 384                          * In copy mode, translate double to single
 385                          * backslashes and backslash-t to literal tabs.
 386                          */
 387                         switch (cp[1]) {
 388                         case 't':
 389                                 cp[0] = '\t';
 390                                 /* FALLTHROUGH */
 391                         case '\\':
 392                                 pairs++;
 393                                 cp++;
 394                                 break;
 395                         case ' ':
 396                                 /* Skip escaped blanks. */
 397                                 if (0 == quoted)
 398                                         cp++;
 399                                 break;
 400                         default:
 401                                 break;
 402                         }
 403                 } else if (0 == quoted) {
 404                         if (' ' == cp[0]) {
 405                                 /* Unescaped blanks end unquoted args. */
 406                                 white = 1;
 407                                 break;
 408                         }
 409                 } else if ('"' == cp[0]) {
 410                         if ('"' == cp[1]) {
 411                                 /* Quoted quotes collapse. */
 412                                 pairs++;
 413                                 cp++;
 414                         } else {
 415                                 /* Unquoted quotes end quoted args. */
 416                                 quoted = 2;
 417                                 break;
 418                         }
 419                 }
 420         }
 421
 422         /* Quoted argument without a closing quote. */
 423         if (1 == quoted)
 424                 mandoc_msg(MANDOCERR_ARG_QUOTE, parse, ln, *pos, NULL);
 425
 426         /* NUL-terminate this argument and move to the next one. */
 427         if (pairs)
 428                 cp[-pairs] = '\0';
 429         if ('\0' != *cp) {
 430                 *cp++ = '\0';
 431                 while (' ' == *cp)
 432                         cp++;
 433         }
 434         *pos += (int)(cp - start) + (quoted ? 1 : 0);
 435         *cpp = cp;
 436
 437         if ('\0' == *cp && (white || ' ' == cp[-1]))
 438                 mandoc_msg(MANDOCERR_SPACE_EOL, parse, ln, *pos, NULL);
 439
 440         return start;
 441 }
 442
 443 static int
 444 a2time(time_t *t, const char *fmt, const char *p)
 445 {
 446         struct tm        tm;
 447         char            *pp;
 448
 449         memset(&tm, 0, sizeof(struct tm));
 450
 451         pp = NULL;
 452 #if HAVE_STRPTIME
 453         pp = strptime(p, fmt, &tm);
 454 #endif
 455         if (NULL != pp && '\0' == *pp) {
 456                 *t = mktime(&tm);
 457                 return 1;
 458         }
 459
 460         return 0;
 461 }
 462
 463 static char *
 464 time2a(time_t t)
 465 {
 466         struct tm       *tm;
 467         char            *buf, *p;
 468         size_t           ssz;
 469         int              isz;
 470
 471         tm = localtime(&t);
 472         if (tm == NULL)
 473                 return NULL;
 474
 475         /*
 476          * Reserve space:
 477          * up to 9 characters for the month (September) + blank
 478          * up to 2 characters for the day + comma + blank
 479          * 4 characters for the year and a terminating '\0'
 480          */
 481
 482         p = buf = mandoc_malloc(10 + 4 + 4 + 1);
 483
 484         if ((ssz = strftime(p, 10 + 1, "%B ", tm)) == 0)
 485                 goto fail;
 486         p += (int)ssz;
 487
 488         /*
 489          * The output format is just "%d" here, not "%2d" or "%02d".
 490          * That's also the reason why we can't just format the
 491          * date as a whole with "%B %e, %Y" or "%B %d, %Y".
 492          * Besides, the present approach is less prone to buffer
 493          * overflows, in case anybody should ever introduce the bug
 494          * of looking at LC_TIME.
 495          */
 496
 497         if ((isz = snprintf(p, 4 + 1, "%d, ", tm->tm_mday)) == -1)
 498                 goto fail;
 499         p += isz;
 500
 501         if (strftime(p, 4 + 1, "%Y", tm) == 0)
 502                 goto fail;
 503         return buf;
 504
 505 fail:
 506         free(buf);
 507         return NULL;
 508 }
 509
 510 char *
 511 mandoc_normdate(struct mparse *parse, char *in, int ln, int pos)
 512 {
 513         time_t           t;
 514
 515         /* No date specified: use today's date. */
 516
 517         if (in == NULL || *in == '\0' || strcmp(in, "$" "Mdocdate$") == 0) {
 518                 mandoc_msg(MANDOCERR_DATE_MISSING, parse, ln, pos, NULL);
 519                 return time2a(time(NULL));
 520         }
 521
 522         /* Valid mdoc(7) date format. */
 523
 524         if (a2time(&t, "$" "Mdocdate: %b %d %Y $", in) ||
 525             a2time(&t, "%b %d, %Y", in))
 526                 return time2a(t);
 527
 528         /* Do not warn about the legacy man(7) format. */
 529
 530         if ( ! a2time(&t, "%Y-%m-%d", in))
 531                 mandoc_msg(MANDOCERR_DATE_BAD, parse, ln, pos, in);
 532
 533         /* Use any non-mdoc(7) date verbatim. */
 534
 535         return mandoc_strdup(in);
 536 }
 537
 538 int
 539 mandoc_eos(const char *p, size_t sz)
 540 {
 541         const char      *q;
 542         int              enclosed, found;
 543
 544         if (0 == sz)
 545                 return 0;
 546
 547         /*
 548          * End-of-sentence recognition must include situations where
 549          * some symbols, such as `)', allow prior EOS punctuation to
 550          * propagate outward.
 551          */
 552
 553         enclosed = found = 0;
 554         for (q = p + (int)sz - 1; q >= p; q--) {
 555                 switch (*q) {
 556                 case '\"':
 557                 case '\'':
 558                 case ']':
 559                 case ')':
 560                         if (0 == found)
 561                                 enclosed = 1;
 562                         break;
 563                 case '.':
 564                 case '!':
 565                 case '?':
 566                         found = 1;
 567                         break;
 568                 default:
 569                         return found &&
 570                             (!enclosed || isalnum((unsigned char)*q));
 571                 }
 572         }
 573
 574         return found && !enclosed;
 575 }
 576
 577 /*
 578  * Convert a string to a long that may not be <0.
 579  * If the string is invalid, or is less than 0, return -1.
 580  */
 581 int
 582 mandoc_strntoi(const char *p, size_t sz, int base)
 583 {
 584         char             buf[32];
 585         char            *ep;
 586         long             v;
 587
 588         if (sz > 31)
 589                 return -1;
 590
 591         memcpy(buf, p, sz);
 592         buf[(int)sz] = '\0';
 593
 594         errno = 0;
 595         v = strtol(buf, &ep, base);
 596
 597         if (buf[0] == '\0' || *ep != '\0')
 598                 return -1;
 599
 600         if (v > INT_MAX)
 601                 v = INT_MAX;
 602         if (v < INT_MIN)
 603                 v = INT_MIN;
 604
 605         return (int)v;
 606 }