release/src/router/libncurses/ncurses/tinfo/read_entry.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2010,2011 Free Software Foundation, Inc.              *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
   7  * without limitation the rights to use, copy, modify, merge, publish,      *
   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  *     and: Thomas E. Dickey                        1996-on                 *
  33  ****************************************************************************/
  34
  35 /*
  36  *      read_entry.c -- Routine for reading in a compiled terminfo file
  37  */
  38
  39 #include <curses.priv.h>
  40 #include <hashed_db.h>
  41
  42 #include <tic.h>
  43
  44 MODULE_ID("$Id: read_entry.c,v 1.108 2011/02/26 15:36:06 tom Exp $")
  45
  46 #define TYPE_CALLOC(type,elts) typeCalloc(type, (unsigned)(elts))
  47
  48 #if USE_DATABASE
  49 static void
  50 convert_shorts(char *buf, short *Numbers, int count)
  51 {
  52     int i;
  53     for (i = 0; i < count; i++) {
  54         if (IS_NEG1(buf + 2 * i))
  55             Numbers[i] = ABSENT_NUMERIC;
  56         else if (IS_NEG2(buf + 2 * i))
  57             Numbers[i] = CANCELLED_NUMERIC;
  58         else
  59             Numbers[i] = (short) LOW_MSB(buf + 2 * i);
  60         TR(TRACE_DATABASE, ("get Numbers[%d]=%d", i, Numbers[i]));
  61     }
  62 }
  63
  64 static void
  65 convert_strings(char *buf, char **Strings, int count, int size, char *table)
  66 {
  67     int i;
  68     char *p;
  69
  70     for (i = 0; i < count; i++) {
  71         if (IS_NEG1(buf + 2 * i)) {
  72             Strings[i] = ABSENT_STRING;
  73         } else if (IS_NEG2(buf + 2 * i)) {
  74             Strings[i] = CANCELLED_STRING;
  75         } else if ((int) LOW_MSB(buf + 2 * i) > size) {
  76             Strings[i] = ABSENT_STRING;
  77         } else {
  78             Strings[i] = (LOW_MSB(buf + 2 * i) + table);
  79             TR(TRACE_DATABASE, ("Strings[%d] = %s", i, _nc_visbuf(Strings[i])));
  80         }
  81
  82         /* make sure all strings are NUL terminated */
  83         if (VALID_STRING(Strings[i])) {
  84             for (p = Strings[i]; p <= table + size; p++)
  85                 if (*p == '\0')
  86                     break;
  87             /* if there is no NUL, ignore the string */
  88             if (p > table + size)
  89                 Strings[i] = ABSENT_STRING;
  90         }
  91     }
  92 }
  93
  94 static int
  95 fake_read(char *src, int *offset, int limit, char *dst, unsigned want)
  96 {
  97     int have = (limit - *offset);
  98
  99     if (have > 0) {
 100         if ((int) want > have)
 101             want = (unsigned) have;
 102         memcpy(dst, src + *offset, want);
 103         *offset += (int) want;
 104     } else {
 105         want = 0;
 106     }
 107     return (int) want;
 108 }
 109
 110 #define Read(buf, count) fake_read(buffer, &offset, limit, buf, count)
 111
 112 #define read_shorts(buf, count) \
 113         (Read(buf, (unsigned) (count)*2) == (int) (count)*2)
 114
 115 #define even_boundary(value) \
 116     if ((value) % 2 != 0) Read(buf, 1)
 117
 118 NCURSES_EXPORT(int)
 119 _nc_read_termtype(TERMTYPE *ptr, char *buffer, int limit)
 120 /* return 1 if read, 0 if not found or garbled */
 121 {
 122     int offset = 0;
 123     int name_size, bool_count, num_count, str_count, str_size;
 124     int i;
 125     char buf[MAX_ENTRY_SIZE + 1];
 126     char *string_table;
 127     unsigned want, have;
 128
 129     TR(TRACE_DATABASE, ("READ termtype header @%d", offset));
 130
 131     memset(ptr, 0, sizeof(*ptr));
 132
 133     /* grab the header */
 134     if (!read_shorts(buf, 6)
 135         || !IS_TIC_MAGIC(buf)) {
 136         return (TGETENT_NO);
 137     }
 138
 139     name_size = LOW_MSB(buf + 2);
 140     bool_count = LOW_MSB(buf + 4);
 141     num_count = LOW_MSB(buf + 6);
 142     str_count = LOW_MSB(buf + 8);
 143     str_size = LOW_MSB(buf + 10);
 144
 145     TR(TRACE_DATABASE,
 146        ("TERMTYPE name_size=%d, bool=%d/%d, num=%d/%d str=%d/%d(%d)",
 147         name_size, bool_count, BOOLCOUNT, num_count, NUMCOUNT,
 148         str_count, STRCOUNT, str_size));
 149     if (name_size < 0
 150         || bool_count < 0
 151         || num_count < 0
 152         || str_count < 0
 153         || str_size < 0) {
 154         return (TGETENT_NO);
 155     }
 156
 157     want = (unsigned) (str_size + name_size + 1);
 158     if (str_size) {
 159         /* try to allocate space for the string table */
 160         if (str_count * 2 >= (int) sizeof(buf)
 161             || (string_table = typeMalloc(char, want)) == 0) {
 162             return (TGETENT_NO);
 163         }
 164     } else {
 165         str_count = 0;
 166         if ((string_table = typeMalloc(char, want)) == 0) {
 167             return (TGETENT_NO);
 168         }
 169     }
 170
 171     /* grab the name (a null-terminated string) */
 172     want = min(MAX_NAME_SIZE, (unsigned) name_size);
 173     ptr->str_table = string_table;
 174     ptr->term_names = string_table;
 175     if ((have = (unsigned) Read(ptr->term_names, want)) != want) {
 176         memset(ptr->term_names + have, 0, want - have);
 177     }
 178     ptr->term_names[want] = '\0';
 179     string_table += (want + 1);
 180
 181     if (have > MAX_NAME_SIZE)
 182         offset = (int) (have - MAX_NAME_SIZE);
 183
 184     /* grab the booleans */
 185     if ((ptr->Booleans = TYPE_CALLOC(NCURSES_SBOOL,
 186                                      max(BOOLCOUNT, bool_count))) == 0
 187         || Read(ptr->Booleans, (unsigned) bool_count) < bool_count) {
 188         return (TGETENT_NO);
 189     }
 190
 191     /*
 192      * If booleans end on an odd byte, skip it.  The machine they
 193      * originally wrote terminfo on must have been a 16-bit
 194      * word-oriented machine that would trap out if you tried a
 195      * word access off a 2-byte boundary.
 196      */
 197     even_boundary(name_size + bool_count);
 198
 199     /* grab the numbers */
 200     if ((ptr->Numbers = TYPE_CALLOC(short, max(NUMCOUNT, num_count))) == 0
 201         || !read_shorts(buf, num_count)) {
 202         return (TGETENT_NO);
 203     }
 204     convert_shorts(buf, ptr->Numbers, num_count);
 205
 206     if ((ptr->Strings = TYPE_CALLOC(char *, max(STRCOUNT, str_count))) == 0)
 207           return (TGETENT_NO);
 208
 209     if (str_count) {
 210         /* grab the string offsets */
 211         if (!read_shorts(buf, str_count)) {
 212             return (TGETENT_NO);
 213         }
 214         /* finally, grab the string table itself */
 215         if (Read(string_table, (unsigned) str_size) != str_size)
 216             return (TGETENT_NO);
 217         convert_strings(buf, ptr->Strings, str_count, str_size, string_table);
 218     }
 219 #if NCURSES_XNAMES
 220
 221     ptr->num_Booleans = BOOLCOUNT;
 222     ptr->num_Numbers = NUMCOUNT;
 223     ptr->num_Strings = STRCOUNT;
 224
 225     /*
 226      * Read extended entries, if any, after the normal end of terminfo data.
 227      */
 228     even_boundary(str_size);
 229     TR(TRACE_DATABASE, ("READ extended_header @%d", offset));
 230     if (_nc_user_definable && read_shorts(buf, 5)) {
 231         int ext_bool_count = LOW_MSB(buf + 0);
 232         int ext_num_count = LOW_MSB(buf + 2);
 233         int ext_str_count = LOW_MSB(buf + 4);
 234         int ext_str_size = LOW_MSB(buf + 6);
 235         int ext_str_limit = LOW_MSB(buf + 8);
 236         unsigned need = (unsigned) (ext_bool_count + ext_num_count + ext_str_count);
 237         int base = 0;
 238
 239         if (need >= sizeof(buf)
 240             || ext_str_size >= (int) sizeof(buf)
 241             || ext_str_limit >= (int) sizeof(buf)
 242             || ext_bool_count < 0
 243             || ext_num_count < 0
 244             || ext_str_count < 0
 245             || ext_str_size < 0
 246             || ext_str_limit < 0)
 247             return (TGETENT_NO);
 248
 249         ptr->num_Booleans = UShort(BOOLCOUNT + ext_bool_count);
 250         ptr->num_Numbers = UShort(NUMCOUNT + ext_num_count);
 251         ptr->num_Strings = UShort(STRCOUNT + ext_str_count);
 252
 253         ptr->Booleans = typeRealloc(NCURSES_SBOOL, ptr->num_Booleans, ptr->Booleans);
 254         ptr->Numbers = typeRealloc(short, ptr->num_Numbers, ptr->Numbers);
 255         ptr->Strings = typeRealloc(char *, ptr->num_Strings, ptr->Strings);
 256
 257         TR(TRACE_DATABASE, ("extended header is %d/%d/%d(%d:%d)",
 258                             ext_bool_count, ext_num_count, ext_str_count,
 259                             ext_str_size, ext_str_limit));
 260
 261         TR(TRACE_DATABASE, ("READ %d extended-booleans @%d",
 262                             ext_bool_count, offset));
 263         if ((ptr->ext_Booleans = UShort(ext_bool_count)) != 0) {
 264             if (Read(ptr->Booleans + BOOLCOUNT, (unsigned)
 265                      ext_bool_count) != ext_bool_count)
 266                 return (TGETENT_NO);
 267         }
 268         even_boundary(ext_bool_count);
 269
 270         TR(TRACE_DATABASE, ("READ %d extended-numbers @%d",
 271                             ext_num_count, offset));
 272         if ((ptr->ext_Numbers = UShort(ext_num_count)) != 0) {
 273             if (!read_shorts(buf, ext_num_count))
 274                 return (TGETENT_NO);
 275             TR(TRACE_DATABASE, ("Before converting extended-numbers"));
 276             convert_shorts(buf, ptr->Numbers + NUMCOUNT, ext_num_count);
 277         }
 278
 279         TR(TRACE_DATABASE, ("READ extended-offsets @%d", offset));
 280         if ((ext_str_count || need)
 281             && !read_shorts(buf, ext_str_count + (int) need))
 282             return (TGETENT_NO);
 283
 284         TR(TRACE_DATABASE, ("READ %d bytes of extended-strings @%d",
 285                             ext_str_limit, offset));
 286
 287         if (ext_str_limit) {
 288             ptr->ext_str_table = typeMalloc(char, (size_t) ext_str_limit);
 289             if (ptr->ext_str_table == 0)
 290                 return (TGETENT_NO);
 291             if (Read(ptr->ext_str_table, (unsigned) ext_str_limit) != ext_str_limit)
 292                 return (TGETENT_NO);
 293             TR(TRACE_DATABASE, ("first extended-string is %s", _nc_visbuf(ptr->ext_str_table)));
 294         }
 295
 296         if ((ptr->ext_Strings = UShort(ext_str_count)) != 0) {
 297             TR(TRACE_DATABASE,
 298                ("Before computing extended-string capabilities str_count=%d, ext_str_count=%d",
 299                 str_count, ext_str_count));
 300             convert_strings(buf, ptr->Strings + str_count, ext_str_count,
 301                             ext_str_limit, ptr->ext_str_table);
 302             for (i = ext_str_count - 1; i >= 0; i--) {
 303                 TR(TRACE_DATABASE, ("MOVE from [%d:%d] %s",
 304                                     i, i + str_count,
 305                                     _nc_visbuf(ptr->Strings[i + str_count])));
 306                 ptr->Strings[i + STRCOUNT] = ptr->Strings[i + str_count];
 307                 if (VALID_STRING(ptr->Strings[i + STRCOUNT]))
 308                     base += (int) (strlen(ptr->Strings[i + STRCOUNT]) + 1);
 309                 TR(TRACE_DATABASE, ("... to    [%d] %s",
 310                                     i + STRCOUNT,
 311                                     _nc_visbuf(ptr->Strings[i + STRCOUNT])));
 312             }
 313         }
 314
 315         if (need) {
 316             if (ext_str_count >= (MAX_ENTRY_SIZE * 2))
 317                 return (TGETENT_NO);
 318             if ((ptr->ext_Names = TYPE_CALLOC(char *, need)) == 0)
 319                   return (TGETENT_NO);
 320             TR(TRACE_DATABASE,
 321                ("ext_NAMES starting @%d in extended_strings, first = %s",
 322                 base, _nc_visbuf(ptr->ext_str_table + base)));
 323             convert_strings(buf + (2 * ext_str_count),
 324                             ptr->ext_Names,
 325                             (int) need,
 326                             ext_str_limit, ptr->ext_str_table + base);
 327         }
 328
 329         T(("...done reading terminfo bool %d(%d) num %d(%d) str %d(%d)",
 330            ptr->num_Booleans, ptr->ext_Booleans,
 331            ptr->num_Numbers, ptr->ext_Numbers,
 332            ptr->num_Strings, ptr->ext_Strings));
 333
 334         TR(TRACE_DATABASE, ("extend: num_Booleans:%d", ptr->num_Booleans));
 335     } else
 336 #endif /* NCURSES_XNAMES */
 337     {
 338         T(("...done reading terminfo bool %d num %d str %d",
 339            bool_count, num_count, str_count));
 340 #if NCURSES_XNAMES
 341         TR(TRACE_DATABASE, ("normal: num_Booleans:%d", ptr->num_Booleans));
 342 #endif
 343     }
 344
 345     for (i = bool_count; i < BOOLCOUNT; i++)
 346         ptr->Booleans[i] = FALSE;
 347     for (i = num_count; i < NUMCOUNT; i++)
 348         ptr->Numbers[i] = ABSENT_NUMERIC;
 349     for (i = str_count; i < STRCOUNT; i++)
 350         ptr->Strings[i] = ABSENT_STRING;
 351
 352     return (TGETENT_YES);
 353 }
 354
 355 /*
 356  *      int
 357  *      _nc_read_file_entry(filename, ptr)
 358  *
 359  *      Read the compiled terminfo entry in the given file into the
 360  *      structure pointed to by ptr, allocating space for the string
 361  *      table.
 362  */
 363 NCURSES_EXPORT(int)
 364 _nc_read_file_entry(const char *const filename, TERMTYPE *ptr)
 365 /* return 1 if read, 0 if not found or garbled */
 366 {
 367     FILE *fp = 0;
 368     int code;
 369     int limit;
 370     char buffer[MAX_ENTRY_SIZE + 1];
 371
 372     if (_nc_access(filename, R_OK) < 0
 373         || (fp = fopen(filename, "rb")) == 0) {
 374         T(("cannot open terminfo %s (errno=%d)", filename, errno));
 375         code = TGETENT_NO;
 376     } else {
 377         if ((limit = (int) fread(buffer, sizeof(char), sizeof(buffer), fp))
 378             > 0) {
 379
 380             T(("read terminfo %s", filename));
 381             if ((code = _nc_read_termtype(ptr, buffer, limit)) == TGETENT_NO) {
 382                 _nc_free_termtype(ptr);
 383             }
 384         } else {
 385             code = TGETENT_NO;
 386         }
 387         fclose(fp);
 388     }
 389
 390     return (code);
 391 }
 392
 393 /*
 394  * Build a terminfo pathname and try to read the data.  Returns TGETENT_YES on
 395  * success, TGETENT_NO on failure.
 396  */
 397 static int
 398 _nc_read_tic_entry(char *filename,
 399                    unsigned limit,
 400                    const char *const path,
 401                    const char *name,
 402                    TERMTYPE *const tp)
 403 {
 404     int result = TGETENT_NO;
 405
 406     /*
 407      * If we are looking in a directory, assume the entry is a file under that,
 408      * according to the normal rules.
 409      */
 410     unsigned need = (unsigned) (LEAF_LEN + 3 + strlen(path) + strlen(name));
 411     if (need <= limit)
 412         (void) sprintf(filename, "%s/" LEAF_FMT "/%s", path, *name, name);
 413
 414     if (_nc_is_dir_path(path))
 415         result = _nc_read_file_entry(filename, tp);
 416 #if USE_HASHED_DB
 417     else {
 418         static const char suffix[] = DBM_SUFFIX;
 419         DB *capdbp;
 420         unsigned lens = sizeof(suffix) - 1;
 421         unsigned size = strlen(path);
 422         unsigned test = lens + size;
 423
 424         if (test < limit) {
 425             if (size >= lens
 426                 && !strcmp(path + size - lens, suffix))
 427                 (void) strcpy(filename, path);
 428             else
 429                 (void) sprintf(filename, "%s%s", path, suffix);
 430
 431             /*
 432              * It would be nice to optimize the dbopen/close activity, as
 433              * done in the cgetent implementation for tc= clauses.  However,
 434              * since we support multiple database locations, we cannot do
 435              * that.
 436              */
 437             if ((capdbp = _nc_db_open(filename, FALSE)) != 0) {
 438                 DBT key, data;
 439                 int reccnt = 0;
 440                 char *save = strdup(name);
 441
 442                 memset(&key, 0, sizeof(key));
 443                 key.data = save;
 444                 key.size = strlen(save);
 445
 446                 /*
 447                  * This lookup could return termcap data, which we do not want.
 448                  * We are looking for compiled (binary) terminfo data.
 449                  *
 450                  * cgetent uses a two-level lookup.  On the first it uses the
 451                  * given name to return a record containing only the aliases
 452                  * for an entry.  On the second (using that list of aliases as
 453                  * a key), it returns the content of the terminal description.
 454                  * We expect second lookup to return data beginning with the
 455                  * same set of aliases.
 456                  *
 457                  * For compiled terminfo, the list of aliases in the second
 458                  * case will be null-terminated.  A termcap entry will not be,
 459                  * and will run on into the description.  So we can easily
 460                  * distinguish between the two (source/binary) by checking the
 461                  * lengths.
 462                  */
 463                 while (_nc_db_get(capdbp, &key, &data) == 0) {
 464                     int used = data.size - 1;
 465                     char *have = (char *) data.data;
 466
 467                     if (*have++ == 0) {
 468                         if (data.size > key.size
 469                             && IS_TIC_MAGIC(have)) {
 470                             result = _nc_read_termtype(tp, have, used);
 471                             if (result == TGETENT_NO) {
 472                                 _nc_free_termtype(tp);
 473                             }
 474                         }
 475                         break;
 476                     }
 477
 478                     /*
 479                      * Just in case we have a corrupt database, do not waste
 480                      * time with it.
 481                      */
 482                     if (++reccnt >= 3)
 483                         break;
 484
 485                     /*
 486                      * Prepare for the second level.
 487                      */
 488                     key.data = have;
 489                     key.size = used;
 490                 }
 491
 492                 _nc_db_close(capdbp);
 493                 free(save);
 494             }
 495         }
 496     }
 497 #endif
 498     return result;
 499 }
 500 #endif /* USE_DATABASE */
 501
 502 /*
 503  *      _nc_read_entry(char *name, char *filename, TERMTYPE *tp)
 504  *
 505  *      Find and read the compiled entry for a given terminal type,
 506  *      if it exists.  We take pains here to make sure no combination
 507  *      of environment variables and terminal type name can be used to
 508  *      overrun the file buffer.
 509  */
 510
 511 NCURSES_EXPORT(int)
 512 _nc_read_entry(const char *const name, char *const filename, TERMTYPE *const tp)
 513 {
 514     int code = TGETENT_NO;
 515
 516     sprintf(filename, "%.*s", PATH_MAX - 1, name);
 517     if (strlen(name) == 0
 518         || strcmp(name, ".") == 0
 519         || strcmp(name, "..") == 0
 520         || _nc_pathlast(name) != 0
 521         || strchr(name, NCURSES_PATHSEP) != 0) {
 522         T(("illegal or missing entry name '%s'", name));
 523     } else {
 524 #if USE_DATABASE
 525         DBDIRS state = dbdTIC;
 526         int offset = 0;
 527         const char *path;
 528
 529         while ((path = _nc_next_db(&state, &offset)) != 0) {
 530             code = _nc_read_tic_entry(filename, PATH_MAX, path, name, tp);
 531             if (code == TGETENT_YES) {
 532                 _nc_last_db();
 533                 break;
 534             }
 535         }
 536 #endif
 537 #if USE_TERMCAP
 538         if (code != TGETENT_YES) {
 539             code = _nc_read_termcap_entry(name, tp);
 540             sprintf(filename, "%.*s", PATH_MAX - 1, _nc_get_source());
 541         }
 542 #endif
 543     }
 544     return code;
 545 }