src/test.c

   1 /* GNU test program (ksb and mjb) */
   2
   3 /* Modified to run with the GNU shell by bfox. */
   4
   5 /* Copyright (C) 1987-2005, 2007-2011 Free Software Foundation, Inc.
   6
   7    This program is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* Define TEST_STANDALONE to get the /bin/test version.  Otherwise, you get
  21    the shell builtin version. */
  22
  23 #include <config.h>
  24 #include <stdio.h>
  25 #include <sys/types.h>
  26
  27 #define TEST_STANDALONE 1
  28
  29 #ifndef LBRACKET
  30 # define LBRACKET 0
  31 #endif
  32
  33 /* The official name of this program (e.g., no `g' prefix).  */
  34 #if LBRACKET
  35 # define PROGRAM_NAME "["
  36 #else
  37 # define PROGRAM_NAME "test"
  38 #endif
  39
  40 #include "system.h"
  41 #include "quote.h"
  42 #include "stat-time.h"
  43 #include "strnumcmp.h"
  44
  45 #if HAVE_SYS_PARAM_H
  46 # include <sys/param.h>
  47 #endif
  48
  49 /* Exit status for syntax errors, etc.  */
  50 enum { TEST_TRUE, TEST_FALSE, TEST_FAILURE };
  51
  52 #if defined TEST_STANDALONE
  53 # define test_exit(val) exit (val)
  54 #else
  55    static jmp_buf test_exit_buf;
  56    static int test_error_return = 0;
  57 # define test_exit(val) test_error_return = val, longjmp (test_exit_buf, 1)
  58 #endif /* !TEST_STANDALONE */
  59
  60 static int pos;         /* The offset of the current argument in ARGV. */
  61 static int argc;        /* The number of arguments present in ARGV. */
  62 static char **argv;     /* The argument list. */
  63
  64 static bool test_unop (char const *s);
  65 static bool unary_operator (void);
  66 static bool binary_operator (bool);
  67 static bool two_arguments (void);
  68 static bool three_arguments (void);
  69 static bool posixtest (int);
  70
  71 static bool expr (void);
  72 static bool term (void);
  73 static bool and (void);
  74 static bool or (void);
  75
  76 static void test_syntax_error (char const *format, char const *arg)
  77      ATTRIBUTE_NORETURN;
  78 static void beyond (void) ATTRIBUTE_NORETURN;
  79
  80 static void
  81 test_syntax_error (char const *format, char const *arg)
  82 {
  83   fprintf (stderr, "%s: ", argv[0]);
  84   fprintf (stderr, format, arg);
  85   fputc ('\n', stderr);
  86   fflush (stderr);
  87   test_exit (TEST_FAILURE);
  88 }
  89
  90 /* Increment our position in the argument list.  Check that we're not
  91    past the end of the argument list.  This check is supressed if the
  92    argument is false.  */
  93
  94 static void
  95 advance (bool f)
  96 {
  97   ++pos;
  98
  99   if (f && pos >= argc)
 100     beyond ();
 101 }
 102
 103 static void
 104 unary_advance (void)
 105 {
 106   advance (true);
 107   ++pos;
 108 }
 109
 110 /*
 111  * beyond - call when we're beyond the end of the argument list (an
 112  *      error condition)
 113  */
 114 static void
 115 beyond (void)
 116 {
 117   test_syntax_error (_("missing argument after %s"), quote (argv[argc - 1]));
 118 }
 119
 120 /* If the characters pointed to by STRING constitute a valid number,
 121    return a pointer to the start of the number, skipping any blanks or
 122    leading '+'.  Otherwise, report an error and exit.  */
 123 static char const *
 124 find_int (char const *string)
 125 {
 126   char const *p;
 127   char const *number_start;
 128
 129   for (p = string; isblank (to_uchar (*p)); p++)
 130     continue;
 131
 132   if (*p == '+')
 133     {
 134       p++;
 135       number_start = p;
 136     }
 137   else
 138     {
 139       number_start = p;
 140       p += (*p == '-');
 141     }
 142
 143   if (ISDIGIT (*p++))
 144     {
 145       while (ISDIGIT (*p))
 146         p++;
 147       while (isblank (to_uchar (*p)))
 148         p++;
 149       if (!*p)
 150         return number_start;
 151     }
 152
 153   test_syntax_error (_("invalid integer %s"), quote (string));
 154 }
 155
 156 /* Find the modification time of FILE, and stuff it into *MTIME.
 157    Return true if successful.  */
 158 static bool
 159 get_mtime (char const *filename, struct timespec *mtime)
 160 {
 161   struct stat finfo;
 162   bool ok = (stat (filename, &finfo) == 0);
 163 #ifdef lint
 164   static struct timespec const zero;
 165   *mtime = zero;
 166 #endif
 167   if (ok)
 168     *mtime = get_stat_mtime (&finfo);
 169   return ok;
 170 }
 171
 172 /* Return true if S is one of the test command's binary operators.  */
 173 static bool
 174 binop (char const *s)
 175 {
 176   return ((STREQ (s,   "=")) || (STREQ (s,  "!=")) || (STREQ (s, "==")) ||
 177           (STREQ (s,   "-nt")) ||
 178           (STREQ (s, "-ot")) || (STREQ (s, "-ef")) || (STREQ (s, "-eq")) ||
 179           (STREQ (s, "-ne")) || (STREQ (s, "-lt")) || (STREQ (s, "-le")) ||
 180           (STREQ (s, "-gt")) || (STREQ (s, "-ge")));
 181 }
 182
 183 /*
 184  * term - parse a term and return 1 or 0 depending on whether the term
 185  *      evaluates to true or false, respectively.
 186  *
 187  * term ::=
 188  *      '-'('h'|'d'|'f'|'r'|'s'|'w'|'c'|'b'|'p'|'u'|'g'|'k') filename
 189  *      '-'('L'|'x') filename
 190  *      '-t' int
 191  *      '-'('z'|'n') string
 192  *      string
 193  *      string ('!='|'=') string
 194  *      <int> '-'(eq|ne|le|lt|ge|gt) <int>
 195  *      file '-'(nt|ot|ef) file
 196  *      '(' <expr> ')'
 197  * int ::=
 198  *      '-l' string
 199  *      positive and negative integers
 200  */
 201 static bool
 202 term (void)
 203 {
 204   bool value;
 205   bool negated = false;
 206
 207   /* Deal with leading `not's.  */
 208   while (pos < argc && argv[pos][0] == '!' && argv[pos][1] == '\0')
 209     {
 210       advance (true);
 211       negated = !negated;
 212     }
 213
 214   if (pos >= argc)
 215     beyond ();
 216
 217   /* A paren-bracketed argument. */
 218   if (argv[pos][0] == '(' && argv[pos][1] == '\0')
 219     {
 220       int nargs;
 221
 222       advance (true);
 223
 224       for (nargs = 1;
 225            pos + nargs < argc && ! STREQ (argv[pos + nargs], ")");
 226            nargs++)
 227         if (nargs == 4)
 228           {
 229             nargs = argc - pos;
 230             break;
 231           }
 232
 233       value = posixtest (nargs);
 234       if (argv[pos] == 0)
 235         test_syntax_error (_("')' expected"), NULL);
 236       else
 237         if (argv[pos][0] != ')' || argv[pos][1])
 238           test_syntax_error (_("')' expected, found %s"), argv[pos]);
 239       advance (false);
 240     }
 241
 242   /* Are there enough arguments left that this could be dyadic?  */
 243   else if (4 <= argc - pos && STREQ (argv[pos], "-l") && binop (argv[pos + 2]))
 244     value = binary_operator (true);
 245   else if (3 <= argc - pos && binop (argv[pos + 1]))
 246     value = binary_operator (false);
 247
 248   /* It might be a switch type argument.  */
 249   else if (argv[pos][0] == '-' && argv[pos][1] && argv[pos][2] == '\0')
 250     {
 251       if (test_unop (argv[pos]))
 252         value = unary_operator ();
 253       else
 254         test_syntax_error (_("%s: unary operator expected"), argv[pos]);
 255     }
 256   else
 257     {
 258       value = (argv[pos][0] != '\0');
 259       advance (false);
 260     }
 261
 262   return negated ^ value;
 263 }
 264
 265 static bool
 266 binary_operator (bool l_is_l)
 267 {
 268   int op;
 269   struct stat stat_buf, stat_spare;
 270   /* Is the right integer expression of the form '-l string'? */
 271   bool r_is_l;
 272
 273   if (l_is_l)
 274     advance (false);
 275   op = pos + 1;
 276
 277   if ((op < argc - 2) && STREQ (argv[op + 1], "-l"))
 278     {
 279       r_is_l = true;
 280       advance (false);
 281     }
 282   else
 283     r_is_l = false;
 284
 285   if (argv[op][0] == '-')
 286     {
 287       /* check for eq, nt, and stuff */
 288       if ((((argv[op][1] == 'l' || argv[op][1] == 'g')
 289             && (argv[op][2] == 'e' || argv[op][2] == 't'))
 290            || (argv[op][1] == 'e' && argv[op][2] == 'q')
 291            || (argv[op][1] == 'n' && argv[op][2] == 'e'))
 292           && !argv[op][3])
 293         {
 294           char lbuf[INT_BUFSIZE_BOUND (uintmax_t)];
 295           char rbuf[INT_BUFSIZE_BOUND (uintmax_t)];
 296           char const *l = (l_is_l
 297                            ? umaxtostr (strlen (argv[op - 1]), lbuf)
 298                            : find_int (argv[op - 1]));
 299           char const *r = (r_is_l
 300                            ? umaxtostr (strlen (argv[op + 2]), rbuf)
 301                            : find_int (argv[op + 1]));
 302           int cmp = strintcmp (l, r);
 303           bool xe_operator = (argv[op][2] == 'e');
 304           pos += 3;
 305           return (argv[op][1] == 'l' ? cmp < xe_operator
 306                   : argv[op][1] == 'g' ? cmp > - xe_operator
 307                   : (cmp != 0) == xe_operator);
 308         }
 309
 310       switch (argv[op][1])
 311         {
 312         default:
 313           break;
 314
 315         case 'n':
 316           if (argv[op][2] == 't' && !argv[op][3])
 317             {
 318               /* nt - newer than */
 319               struct timespec lt, rt;
 320               bool le, re;
 321               pos += 3;
 322               if (l_is_l || r_is_l)
 323                 test_syntax_error (_("-nt does not accept -l"), NULL);
 324               le = get_mtime (argv[op - 1], &lt);
 325               re = get_mtime (argv[op + 1], &rt);
 326               return le && (!re || timespec_cmp (lt, rt) > 0);
 327             }
 328           break;
 329
 330         case 'e':
 331           if (argv[op][2] == 'f' && !argv[op][3])
 332             {
 333               /* ef - hard link? */
 334               pos += 3;
 335               if (l_is_l || r_is_l)
 336                 test_syntax_error (_("-ef does not accept -l"), NULL);
 337               return (stat (argv[op - 1], &stat_buf) == 0
 338                       && stat (argv[op + 1], &stat_spare) == 0
 339                       && stat_buf.st_dev == stat_spare.st_dev
 340                       && stat_buf.st_ino == stat_spare.st_ino);
 341             }
 342           break;
 343
 344         case 'o':
 345           if ('t' == argv[op][2] && '\000' == argv[op][3])
 346             {
 347               /* ot - older than */
 348               struct timespec lt, rt;
 349               bool le, re;
 350               pos += 3;
 351               if (l_is_l || r_is_l)
 352                 test_syntax_error (_("-ot does not accept -l"), NULL);
 353               le = get_mtime (argv[op - 1], &lt);
 354               re = get_mtime (argv[op + 1], &rt);
 355               return re && (!le || timespec_cmp (lt, rt) < 0);
 356             }
 357           break;
 358         }
 359
 360       /* FIXME: is this dead code? */
 361       test_syntax_error (_("unknown binary operator"), argv[op]);
 362     }
 363
 364   if (argv[op][0] == '=' && (!argv[op][1] ||
 365        ((argv[op][1] == '=') && !argv[op][2])))
 366     {
 367       bool value = STREQ (argv[pos], argv[pos + 2]);
 368       pos += 3;
 369       return value;
 370     }
 371
 372   if (STREQ (argv[op], "!="))
 373     {
 374       bool value = !STREQ (argv[pos], argv[pos + 2]);
 375       pos += 3;
 376       return value;
 377     }
 378
 379   /* Not reached.  */
 380   abort ();
 381 }
 382
 383 static bool
 384 unary_operator (void)
 385 {
 386   struct stat stat_buf;
 387
 388   switch (argv[pos][1])
 389     {
 390     default:
 391       return false;
 392
 393       /* All of the following unary operators use unary_advance (), which
 394          checks to make sure that there is an argument, and then advances
 395          pos right past it.  This means that pos - 1 is the location of the
 396          argument. */
 397
 398     case 'a':                   /* file exists in the file system? */
 399     case 'e':
 400       unary_advance ();
 401       return stat (argv[pos - 1], &stat_buf) == 0;
 402
 403     case 'r':                   /* file is readable? */
 404       unary_advance ();
 405       return euidaccess (argv[pos - 1], R_OK) == 0;
 406
 407     case 'w':                   /* File is writable? */
 408       unary_advance ();
 409       return euidaccess (argv[pos - 1], W_OK) == 0;
 410
 411     case 'x':                   /* File is executable? */
 412       unary_advance ();
 413       return euidaccess (argv[pos - 1], X_OK) == 0;
 414
 415     case 'O':                   /* File is owned by you? */
 416       {
 417         unary_advance ();
 418         if (stat (argv[pos - 1], &stat_buf) != 0)
 419           return false;
 420         errno = 0;
 421         uid_t euid = geteuid ();
 422         uid_t NO_UID = -1;
 423         return ! (euid == NO_UID && errno) && euid == stat_buf.st_uid;
 424       }
 425
 426     case 'G':                   /* File is owned by your group? */
 427       {
 428         unary_advance ();
 429         if (stat (argv[pos - 1], &stat_buf) != 0)
 430           return false;
 431         errno = 0;
 432         gid_t egid = getegid ();
 433         gid_t NO_GID = -1;
 434         return ! (egid == NO_GID && errno) && egid == stat_buf.st_gid;
 435       }
 436
 437     case 'f':                   /* File is a file? */
 438       unary_advance ();
 439       /* Under POSIX, -f is true if the given file exists
 440          and is a regular file. */
 441       return (stat (argv[pos - 1], &stat_buf) == 0
 442               && S_ISREG (stat_buf.st_mode));
 443
 444     case 'd':                   /* File is a directory? */
 445       unary_advance ();
 446       return (stat (argv[pos - 1], &stat_buf) == 0
 447               && S_ISDIR (stat_buf.st_mode));
 448
 449     case 's':                   /* File has something in it? */
 450       unary_advance ();
 451       return (stat (argv[pos - 1], &stat_buf) == 0
 452               && 0 < stat_buf.st_size);
 453
 454     case 'S':                   /* File is a socket? */
 455       unary_advance ();
 456       return (stat (argv[pos - 1], &stat_buf) == 0
 457               && S_ISSOCK (stat_buf.st_mode));
 458
 459     case 'c':                   /* File is character special? */
 460       unary_advance ();
 461       return (stat (argv[pos - 1], &stat_buf) == 0
 462               && S_ISCHR (stat_buf.st_mode));
 463
 464     case 'b':                   /* File is block special? */
 465       unary_advance ();
 466       return (stat (argv[pos - 1], &stat_buf) == 0
 467               && S_ISBLK (stat_buf.st_mode));
 468
 469     case 'p':                   /* File is a named pipe? */
 470       unary_advance ();
 471       return (stat (argv[pos - 1], &stat_buf) == 0
 472               && S_ISFIFO (stat_buf.st_mode));
 473
 474     case 'L':                   /* Same as -h  */
 475       /*FALLTHROUGH*/
 476
 477     case 'h':                   /* File is a symbolic link? */
 478       unary_advance ();
 479       return (lstat (argv[pos - 1], &stat_buf) == 0
 480               && S_ISLNK (stat_buf.st_mode));
 481
 482     case 'u':                   /* File is setuid? */
 483       unary_advance ();
 484       return (stat (argv[pos - 1], &stat_buf) == 0
 485               && (stat_buf.st_mode & S_ISUID));
 486
 487     case 'g':                   /* File is setgid? */
 488       unary_advance ();
 489       return (stat (argv[pos - 1], &stat_buf) == 0
 490               && (stat_buf.st_mode & S_ISGID));
 491
 492     case 'k':                   /* File has sticky bit set? */
 493       unary_advance ();
 494       return (stat (argv[pos - 1], &stat_buf) == 0
 495               && (stat_buf.st_mode & S_ISVTX));
 496
 497     case 't':                   /* File (fd) is a terminal? */
 498       {
 499         long int fd;
 500         char const *arg;
 501         unary_advance ();
 502         arg = find_int (argv[pos - 1]);
 503         errno = 0;
 504         fd = strtol (arg, NULL, 10);
 505         return (errno != ERANGE && 0 <= fd && fd <= INT_MAX && isatty (fd));
 506       }
 507
 508     case 'n':                   /* True if arg has some length. */
 509       unary_advance ();
 510       return argv[pos - 1][0] != 0;
 511
 512     case 'z':                   /* True if arg has no length. */
 513       unary_advance ();
 514       return argv[pos - 1][0] == '\0';
 515     }
 516 }
 517
 518 /*
 519  * and:
 520  *      term
 521  *      term '-a' and
 522  */
 523 static bool
 524 and (void)
 525 {
 526   bool value = true;
 527
 528   while (true)
 529     {
 530       value &= term ();
 531       if (! (pos < argc && STREQ (argv[pos], "-a")))
 532         return value;
 533       advance (false);
 534     }
 535 }
 536
 537 /*
 538  * or:
 539  *      and
 540  *      and '-o' or
 541  */
 542 static bool
 543 or (void)
 544 {
 545   bool value = false;
 546
 547   while (true)
 548     {
 549       value |= and ();
 550       if (! (pos < argc && STREQ (argv[pos], "-o")))
 551         return value;
 552       advance (false);
 553     }
 554 }
 555
 556 /*
 557  * expr:
 558  *      or
 559  */
 560 static bool
 561 expr (void)
 562 {
 563   if (pos >= argc)
 564     beyond ();
 565
 566   return or ();         /* Same with this. */
 567 }
 568
 569 /* Return true if OP is one of the test command's unary operators. */
 570 static bool
 571 test_unop (char const *op)
 572 {
 573   if (op[0] != '-')
 574     return false;
 575
 576   switch (op[1])
 577     {
 578     case 'a': case 'b': case 'c': case 'd': case 'e':
 579     case 'f': case 'g': case 'h': case 'k': case 'n':
 580     case 'o': case 'p': case 'r': case 's': case 't':
 581     case 'u': case 'w': case 'x': case 'z':
 582     case 'G': case 'L': case 'O': case 'S': case 'N':
 583       return true;
 584     default:
 585       return false;
 586     }
 587 }
 588
 589 static bool
 590 one_argument (void)
 591 {
 592   return argv[pos++][0] != '\0';
 593 }
 594
 595 static bool
 596 two_arguments (void)
 597 {
 598   bool value;
 599
 600   if (STREQ (argv[pos], "!"))
 601     {
 602       advance (false);
 603       value = ! one_argument ();
 604     }
 605   else if (argv[pos][0] == '-'
 606            && argv[pos][1] != '\0'
 607            && argv[pos][2] == '\0')
 608     {
 609       if (test_unop (argv[pos]))
 610         value = unary_operator ();
 611       else
 612         test_syntax_error (_("%s: unary operator expected"), argv[pos]);
 613     }
 614   else
 615     beyond ();
 616   return (value);
 617 }
 618
 619 static bool
 620 three_arguments (void)
 621 {
 622   bool value;
 623
 624   if (binop (argv[pos + 1]))
 625     value = binary_operator (false);
 626   else if (STREQ (argv[pos], "!"))
 627     {
 628       advance (true);
 629       value = !two_arguments ();
 630     }
 631   else if (STREQ (argv[pos], "(") && STREQ (argv[pos + 2], ")"))
 632     {
 633       advance (false);
 634       value = one_argument ();
 635       advance (false);
 636     }
 637   else if (STREQ (argv[pos + 1], "-a") || STREQ (argv[pos + 1], "-o"))
 638     value = expr ();
 639   else
 640     test_syntax_error (_("%s: binary operator expected"), argv[pos+1]);
 641   return (value);
 642 }
 643
 644 /* This is an implementation of a Posix.2 proposal by David Korn. */
 645 static bool
 646 posixtest (int nargs)
 647 {
 648   bool value;
 649
 650   switch (nargs)
 651     {
 652       case 1:
 653         value = one_argument ();
 654         break;
 655
 656       case 2:
 657         value = two_arguments ();
 658         break;
 659
 660       case 3:
 661         value = three_arguments ();
 662         break;
 663
 664       case 4:
 665         if (STREQ (argv[pos], "!"))
 666           {
 667             advance (true);
 668             value = !three_arguments ();
 669             break;
 670           }
 671         if (STREQ (argv[pos], "(") && STREQ (argv[pos + 3], ")"))
 672           {
 673             advance (false);
 674             value = two_arguments ();
 675             advance (false);
 676             break;
 677           }
 678         /* FALLTHROUGH */
 679       case 5:
 680       default:
 681         if (nargs <= 0)
 682           abort ();
 683         value = expr ();
 684     }
 685
 686   return (value);
 687 }
 688
 689 #if defined TEST_STANDALONE
 690
 691 void
 692 usage (int status)
 693 {
 694   if (status != EXIT_SUCCESS)
 695     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 696              program_name);
 697   else
 698     {
 699       fputs (_("\
 700 Usage: test EXPRESSION\n\
 701   or:  test\n\
 702   or:  [ EXPRESSION ]\n\
 703   or:  [ ]\n\
 704   or:  [ OPTION\n\
 705 "), stdout);
 706       fputs (_("\
 707 Exit with the status determined by EXPRESSION.\n\
 708 \n\
 709 "), stdout);
 710       fputs (HELP_OPTION_DESCRIPTION, stdout);
 711       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 712       fputs (_("\
 713 \n\
 714 An omitted EXPRESSION defaults to false.  Otherwise,\n\
 715 EXPRESSION is true or false and sets exit status.  It is one of:\n\
 716 "), stdout);
 717       fputs (_("\
 718 \n\
 719   ( EXPRESSION )               EXPRESSION is true\n\
 720   ! EXPRESSION                 EXPRESSION is false\n\
 721   EXPRESSION1 -a EXPRESSION2   both EXPRESSION1 and EXPRESSION2 are true\n\
 722   EXPRESSION1 -o EXPRESSION2   either EXPRESSION1 or EXPRESSION2 is true\n\
 723 "), stdout);
 724       fputs (_("\
 725 \n\
 726   -n STRING            the length of STRING is nonzero\n\
 727   STRING               equivalent to -n STRING\n\
 728   -z STRING            the length of STRING is zero\n\
 729   STRING1 = STRING2    the strings are equal\n\
 730   STRING1 != STRING2   the strings are not equal\n\
 731 "), stdout);
 732       fputs (_("\
 733 \n\
 734   INTEGER1 -eq INTEGER2   INTEGER1 is equal to INTEGER2\n\
 735   INTEGER1 -ge INTEGER2   INTEGER1 is greater than or equal to INTEGER2\n\
 736   INTEGER1 -gt INTEGER2   INTEGER1 is greater than INTEGER2\n\
 737   INTEGER1 -le INTEGER2   INTEGER1 is less than or equal to INTEGER2\n\
 738   INTEGER1 -lt INTEGER2   INTEGER1 is less than INTEGER2\n\
 739   INTEGER1 -ne INTEGER2   INTEGER1 is not equal to INTEGER2\n\
 740 "), stdout);
 741       fputs (_("\
 742 \n\
 743   FILE1 -ef FILE2   FILE1 and FILE2 have the same device and inode numbers\n\
 744   FILE1 -nt FILE2   FILE1 is newer (modification date) than FILE2\n\
 745   FILE1 -ot FILE2   FILE1 is older than FILE2\n\
 746 "), stdout);
 747       fputs (_("\
 748 \n\
 749   -b FILE     FILE exists and is block special\n\
 750   -c FILE     FILE exists and is character special\n\
 751   -d FILE     FILE exists and is a directory\n\
 752   -e FILE     FILE exists\n\
 753 "), stdout);
 754       fputs (_("\
 755   -f FILE     FILE exists and is a regular file\n\
 756   -g FILE     FILE exists and is set-group-ID\n\
 757   -G FILE     FILE exists and is owned by the effective group ID\n\
 758   -h FILE     FILE exists and is a symbolic link (same as -L)\n\
 759   -k FILE     FILE exists and has its sticky bit set\n\
 760 "), stdout);
 761       fputs (_("\
 762   -L FILE     FILE exists and is a symbolic link (same as -h)\n\
 763   -O FILE     FILE exists and is owned by the effective user ID\n\
 764   -p FILE     FILE exists and is a named pipe\n\
 765   -r FILE     FILE exists and read permission is granted\n\
 766   -s FILE     FILE exists and has a size greater than zero\n\
 767 "), stdout);
 768       fputs (_("\
 769   -S FILE     FILE exists and is a socket\n\
 770   -t FD       file descriptor FD is opened on a terminal\n\
 771   -u FILE     FILE exists and its set-user-ID bit is set\n\
 772   -w FILE     FILE exists and write permission is granted\n\
 773   -x FILE     FILE exists and execute (or search) permission is granted\n\
 774 "), stdout);
 775       fputs (_("\
 776 \n\
 777 Except for -h and -L, all FILE-related tests dereference symbolic links.\n\
 778 Beware that parentheses need to be escaped (e.g., by backslashes) for shells.\n\
 779 INTEGER may also be -l STRING, which evaluates to the length of STRING.\n\
 780 "), stdout);
 781       fputs (_("\
 782 \n\
 783 NOTE: [ honors the --help and --version options, but test does not.\n\
 784 test treats each of those as it treats any other nonempty STRING.\n\
 785 "), stdout);
 786       printf (USAGE_BUILTIN_WARNING, _("test and/or ["));
 787       emit_ancillary_info ();
 788     }
 789   exit (status);
 790 }
 791 #endif /* TEST_STANDALONE */
 792
 793 #if !defined TEST_STANDALONE
 794 # define main test_command
 795 #endif
 796
 797 #define AUTHORS \
 798   proper_name ("Kevin Braunsdorf"), \
 799   proper_name ("Matthew Bradburn")
 800
 801 /*
 802  * [:
 803  *      '[' expr ']'
 804  * test:
 805  *      test expr
 806  */
 807 int
 808 main (int margc, char **margv)
 809 {
 810   bool value;
 811
 812 #if !defined TEST_STANDALONE
 813   int code;
 814
 815   code = setjmp (test_exit_buf);
 816
 817   if (code)
 818     return (test_error_return);
 819 #else /* TEST_STANDALONE */
 820   initialize_main (&margc, &margv);
 821   set_program_name (margv[0]);
 822   setlocale (LC_ALL, "");
 823   bindtextdomain (PACKAGE, LOCALEDIR);
 824   textdomain (PACKAGE);
 825
 826   initialize_exit_failure (TEST_FAILURE);
 827   atexit (close_stdout);
 828 #endif /* TEST_STANDALONE */
 829
 830   argv = margv;
 831
 832   if (LBRACKET)
 833     {
 834       /* Recognize --help or --version, but only when invoked in the
 835          "[" form, when the last argument is not "]".  Use direct
 836          parsing, rather than parse_long_options, to avoid accepting
 837          abbreviations.  POSIX allows "[ --help" and "[ --version" to
 838          have the usual GNU behavior, but it requires "test --help"
 839          and "test --version" to exit silently with status 0.  */
 840       if (margc == 2)
 841         {
 842           if (STREQ (margv[1], "--help"))
 843             usage (EXIT_SUCCESS);
 844
 845           if (STREQ (margv[1], "--version"))
 846             {
 847               version_etc (stdout, PROGRAM_NAME, PACKAGE_NAME, Version, AUTHORS,
 848                            (char *) NULL);
 849               test_exit (EXIT_SUCCESS);
 850             }
 851         }
 852       if (margc < 2 || !STREQ (margv[margc - 1], "]"))
 853         test_syntax_error (_("missing `]'"), NULL);
 854
 855       --margc;
 856     }
 857
 858   argc = margc;
 859   pos = 1;
 860
 861   if (pos >= argc)
 862     test_exit (TEST_FALSE);
 863
 864   value = posixtest (argc - 1);
 865
 866   if (pos != argc)
 867     test_syntax_error (_("extra argument %s"), quote (argv[pos]));
 868
 869   test_exit (value ? TEST_TRUE : TEST_FALSE);
 870 }