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       unary_advance ();
 417       return (stat (argv[pos - 1], &stat_buf) == 0
 418               && (geteuid () == stat_buf.st_uid));
 419
 420     case 'G':                   /* File is owned by your group? */
 421       unary_advance ();
 422       return (stat (argv[pos - 1], &stat_buf) == 0
 423               && (getegid () == stat_buf.st_gid));
 424
 425     case 'f':                   /* File is a file? */
 426       unary_advance ();
 427       /* Under POSIX, -f is true if the given file exists
 428          and is a regular file. */
 429       return (stat (argv[pos - 1], &stat_buf) == 0
 430               && S_ISREG (stat_buf.st_mode));
 431
 432     case 'd':                   /* File is a directory? */
 433       unary_advance ();
 434       return (stat (argv[pos - 1], &stat_buf) == 0
 435               && S_ISDIR (stat_buf.st_mode));
 436
 437     case 's':                   /* File has something in it? */
 438       unary_advance ();
 439       return (stat (argv[pos - 1], &stat_buf) == 0
 440               && 0 < stat_buf.st_size);
 441
 442     case 'S':                   /* File is a socket? */
 443       unary_advance ();
 444       return (stat (argv[pos - 1], &stat_buf) == 0
 445               && S_ISSOCK (stat_buf.st_mode));
 446
 447     case 'c':                   /* File is character special? */
 448       unary_advance ();
 449       return (stat (argv[pos - 1], &stat_buf) == 0
 450               && S_ISCHR (stat_buf.st_mode));
 451
 452     case 'b':                   /* File is block special? */
 453       unary_advance ();
 454       return (stat (argv[pos - 1], &stat_buf) == 0
 455               && S_ISBLK (stat_buf.st_mode));
 456
 457     case 'p':                   /* File is a named pipe? */
 458       unary_advance ();
 459       return (stat (argv[pos - 1], &stat_buf) == 0
 460               && S_ISFIFO (stat_buf.st_mode));
 461
 462     case 'L':                   /* Same as -h  */
 463       /*FALLTHROUGH*/
 464
 465     case 'h':                   /* File is a symbolic link? */
 466       unary_advance ();
 467       return (lstat (argv[pos - 1], &stat_buf) == 0
 468               && S_ISLNK (stat_buf.st_mode));
 469
 470     case 'u':                   /* File is setuid? */
 471       unary_advance ();
 472       return (stat (argv[pos - 1], &stat_buf) == 0
 473               && (stat_buf.st_mode & S_ISUID));
 474
 475     case 'g':                   /* File is setgid? */
 476       unary_advance ();
 477       return (stat (argv[pos - 1], &stat_buf) == 0
 478               && (stat_buf.st_mode & S_ISGID));
 479
 480     case 'k':                   /* File has sticky bit set? */
 481       unary_advance ();
 482       return (stat (argv[pos - 1], &stat_buf) == 0
 483               && (stat_buf.st_mode & S_ISVTX));
 484
 485     case 't':                   /* File (fd) is a terminal? */
 486       {
 487         long int fd;
 488         char const *arg;
 489         unary_advance ();
 490         arg = find_int (argv[pos - 1]);
 491         errno = 0;
 492         fd = strtol (arg, NULL, 10);
 493         return (errno != ERANGE && 0 <= fd && fd <= INT_MAX && isatty (fd));
 494       }
 495
 496     case 'n':                   /* True if arg has some length. */
 497       unary_advance ();
 498       return argv[pos - 1][0] != 0;
 499
 500     case 'z':                   /* True if arg has no length. */
 501       unary_advance ();
 502       return argv[pos - 1][0] == '\0';
 503     }
 504 }
 505
 506 /*
 507  * and:
 508  *      term
 509  *      term '-a' and
 510  */
 511 static bool
 512 and (void)
 513 {
 514   bool value = true;
 515
 516   while (true)
 517     {
 518       value &= term ();
 519       if (! (pos < argc && STREQ (argv[pos], "-a")))
 520         return value;
 521       advance (false);
 522     }
 523 }
 524
 525 /*
 526  * or:
 527  *      and
 528  *      and '-o' or
 529  */
 530 static bool
 531 or (void)
 532 {
 533   bool value = false;
 534
 535   while (true)
 536     {
 537       value |= and ();
 538       if (! (pos < argc && STREQ (argv[pos], "-o")))
 539         return value;
 540       advance (false);
 541     }
 542 }
 543
 544 /*
 545  * expr:
 546  *      or
 547  */
 548 static bool
 549 expr (void)
 550 {
 551   if (pos >= argc)
 552     beyond ();
 553
 554   return or ();         /* Same with this. */
 555 }
 556
 557 /* Return true if OP is one of the test command's unary operators. */
 558 static bool
 559 test_unop (char const *op)
 560 {
 561   if (op[0] != '-')
 562     return false;
 563
 564   switch (op[1])
 565     {
 566     case 'a': case 'b': case 'c': case 'd': case 'e':
 567     case 'f': case 'g': case 'h': case 'k': case 'n':
 568     case 'o': case 'p': case 'r': case 's': case 't':
 569     case 'u': case 'w': case 'x': case 'z':
 570     case 'G': case 'L': case 'O': case 'S': case 'N':
 571       return true;
 572     default:
 573       return false;
 574     }
 575 }
 576
 577 static bool
 578 one_argument (void)
 579 {
 580   return argv[pos++][0] != '\0';
 581 }
 582
 583 static bool
 584 two_arguments (void)
 585 {
 586   bool value;
 587
 588   if (STREQ (argv[pos], "!"))
 589     {
 590       advance (false);
 591       value = ! one_argument ();
 592     }
 593   else if (argv[pos][0] == '-'
 594            && argv[pos][1] != '\0'
 595            && argv[pos][2] == '\0')
 596     {
 597       if (test_unop (argv[pos]))
 598         value = unary_operator ();
 599       else
 600         test_syntax_error (_("%s: unary operator expected"), argv[pos]);
 601     }
 602   else
 603     beyond ();
 604   return (value);
 605 }
 606
 607 static bool
 608 three_arguments (void)
 609 {
 610   bool value;
 611
 612   if (binop (argv[pos + 1]))
 613     value = binary_operator (false);
 614   else if (STREQ (argv[pos], "!"))
 615     {
 616       advance (true);
 617       value = !two_arguments ();
 618     }
 619   else if (STREQ (argv[pos], "(") && STREQ (argv[pos + 2], ")"))
 620     {
 621       advance (false);
 622       value = one_argument ();
 623       advance (false);
 624     }
 625   else if (STREQ (argv[pos + 1], "-a") || STREQ (argv[pos + 1], "-o"))
 626     value = expr ();
 627   else
 628     test_syntax_error (_("%s: binary operator expected"), argv[pos+1]);
 629   return (value);
 630 }
 631
 632 /* This is an implementation of a Posix.2 proposal by David Korn. */
 633 static bool
 634 posixtest (int nargs)
 635 {
 636   bool value;
 637
 638   switch (nargs)
 639     {
 640       case 1:
 641         value = one_argument ();
 642         break;
 643
 644       case 2:
 645         value = two_arguments ();
 646         break;
 647
 648       case 3:
 649         value = three_arguments ();
 650         break;
 651
 652       case 4:
 653         if (STREQ (argv[pos], "!"))
 654           {
 655             advance (true);
 656             value = !three_arguments ();
 657             break;
 658           }
 659         if (STREQ (argv[pos], "(") && STREQ (argv[pos + 3], ")"))
 660           {
 661             advance (false);
 662             value = two_arguments ();
 663             advance (false);
 664             break;
 665           }
 666         /* FALLTHROUGH */
 667       case 5:
 668       default:
 669         if (nargs <= 0)
 670           abort ();
 671         value = expr ();
 672     }
 673
 674   return (value);
 675 }
 676
 677 #if defined TEST_STANDALONE
 678
 679 void
 680 usage (int status)
 681 {
 682   if (status != EXIT_SUCCESS)
 683     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 684              program_name);
 685   else
 686     {
 687       fputs (_("\
 688 Usage: test EXPRESSION\n\
 689   or:  test\n\
 690   or:  [ EXPRESSION ]\n\
 691   or:  [ ]\n\
 692   or:  [ OPTION\n\
 693 "), stdout);
 694       fputs (_("\
 695 Exit with the status determined by EXPRESSION.\n\
 696 \n\
 697 "), stdout);
 698       fputs (HELP_OPTION_DESCRIPTION, stdout);
 699       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 700       fputs (_("\
 701 \n\
 702 An omitted EXPRESSION defaults to false.  Otherwise,\n\
 703 EXPRESSION is true or false and sets exit status.  It is one of:\n\
 704 "), stdout);
 705       fputs (_("\
 706 \n\
 707   ( EXPRESSION )               EXPRESSION is true\n\
 708   ! EXPRESSION                 EXPRESSION is false\n\
 709   EXPRESSION1 -a EXPRESSION2   both EXPRESSION1 and EXPRESSION2 are true\n\
 710   EXPRESSION1 -o EXPRESSION2   either EXPRESSION1 or EXPRESSION2 is true\n\
 711 "), stdout);
 712       fputs (_("\
 713 \n\
 714   -n STRING            the length of STRING is nonzero\n\
 715   STRING               equivalent to -n STRING\n\
 716   -z STRING            the length of STRING is zero\n\
 717   STRING1 = STRING2    the strings are equal\n\
 718   STRING1 != STRING2   the strings are not equal\n\
 719 "), stdout);
 720       fputs (_("\
 721 \n\
 722   INTEGER1 -eq INTEGER2   INTEGER1 is equal to INTEGER2\n\
 723   INTEGER1 -ge INTEGER2   INTEGER1 is greater than or equal to INTEGER2\n\
 724   INTEGER1 -gt INTEGER2   INTEGER1 is greater than INTEGER2\n\
 725   INTEGER1 -le INTEGER2   INTEGER1 is less than or equal to INTEGER2\n\
 726   INTEGER1 -lt INTEGER2   INTEGER1 is less than INTEGER2\n\
 727   INTEGER1 -ne INTEGER2   INTEGER1 is not equal to INTEGER2\n\
 728 "), stdout);
 729       fputs (_("\
 730 \n\
 731   FILE1 -ef FILE2   FILE1 and FILE2 have the same device and inode numbers\n\
 732   FILE1 -nt FILE2   FILE1 is newer (modification date) than FILE2\n\
 733   FILE1 -ot FILE2   FILE1 is older than FILE2\n\
 734 "), stdout);
 735       fputs (_("\
 736 \n\
 737   -b FILE     FILE exists and is block special\n\
 738   -c FILE     FILE exists and is character special\n\
 739   -d FILE     FILE exists and is a directory\n\
 740   -e FILE     FILE exists\n\
 741 "), stdout);
 742       fputs (_("\
 743   -f FILE     FILE exists and is a regular file\n\
 744   -g FILE     FILE exists and is set-group-ID\n\
 745   -G FILE     FILE exists and is owned by the effective group ID\n\
 746   -h FILE     FILE exists and is a symbolic link (same as -L)\n\
 747   -k FILE     FILE exists and has its sticky bit set\n\
 748 "), stdout);
 749       fputs (_("\
 750   -L FILE     FILE exists and is a symbolic link (same as -h)\n\
 751   -O FILE     FILE exists and is owned by the effective user ID\n\
 752   -p FILE     FILE exists and is a named pipe\n\
 753   -r FILE     FILE exists and read permission is granted\n\
 754   -s FILE     FILE exists and has a size greater than zero\n\
 755 "), stdout);
 756       fputs (_("\
 757   -S FILE     FILE exists and is a socket\n\
 758   -t FD       file descriptor FD is opened on a terminal\n\
 759   -u FILE     FILE exists and its set-user-ID bit is set\n\
 760   -w FILE     FILE exists and write permission is granted\n\
 761   -x FILE     FILE exists and execute (or search) permission is granted\n\
 762 "), stdout);
 763       fputs (_("\
 764 \n\
 765 Except for -h and -L, all FILE-related tests dereference symbolic links.\n\
 766 Beware that parentheses need to be escaped (e.g., by backslashes) for shells.\n\
 767 INTEGER may also be -l STRING, which evaluates to the length of STRING.\n\
 768 "), stdout);
 769       fputs (_("\
 770 \n\
 771 NOTE: [ honors the --help and --version options, but test does not.\n\
 772 test treats each of those as it treats any other nonempty STRING.\n\
 773 "), stdout);
 774       printf (USAGE_BUILTIN_WARNING, _("test and/or ["));
 775       emit_ancillary_info ();
 776     }
 777   exit (status);
 778 }
 779 #endif /* TEST_STANDALONE */
 780
 781 #if !defined TEST_STANDALONE
 782 # define main test_command
 783 #endif
 784
 785 #define AUTHORS \
 786   proper_name ("Kevin Braunsdorf"), \
 787   proper_name ("Matthew Bradburn")
 788
 789 /*
 790  * [:
 791  *      '[' expr ']'
 792  * test:
 793  *      test expr
 794  */
 795 int
 796 main (int margc, char **margv)
 797 {
 798   bool value;
 799
 800 #if !defined TEST_STANDALONE
 801   int code;
 802
 803   code = setjmp (test_exit_buf);
 804
 805   if (code)
 806     return (test_error_return);
 807 #else /* TEST_STANDALONE */
 808   initialize_main (&margc, &margv);
 809   set_program_name (margv[0]);
 810   setlocale (LC_ALL, "");
 811   bindtextdomain (PACKAGE, LOCALEDIR);
 812   textdomain (PACKAGE);
 813
 814   initialize_exit_failure (TEST_FAILURE);
 815   atexit (close_stdout);
 816 #endif /* TEST_STANDALONE */
 817
 818   argv = margv;
 819
 820   if (LBRACKET)
 821     {
 822       /* Recognize --help or --version, but only when invoked in the
 823          "[" form, when the last argument is not "]".  Use direct
 824          parsing, rather than parse_long_options, to avoid accepting
 825          abbreviations.  POSIX allows "[ --help" and "[ --version" to
 826          have the usual GNU behavior, but it requires "test --help"
 827          and "test --version" to exit silently with status 0.  */
 828       if (margc == 2)
 829         {
 830           if (STREQ (margv[1], "--help"))
 831             usage (EXIT_SUCCESS);
 832
 833           if (STREQ (margv[1], "--version"))
 834             {
 835               version_etc (stdout, PROGRAM_NAME, PACKAGE_NAME, Version, AUTHORS,
 836                            (char *) NULL);
 837               test_exit (EXIT_SUCCESS);
 838             }
 839         }
 840       if (margc < 2 || !STREQ (margv[margc - 1], "]"))
 841         test_syntax_error (_("missing `]'"), NULL);
 842
 843       --margc;
 844     }
 845
 846   argc = margc;
 847   pos = 1;
 848
 849   if (pos >= argc)
 850     test_exit (TEST_FALSE);
 851
 852   value = posixtest (argc - 1);
 853
 854   if (pos != argc)
 855     test_syntax_error (_("extra argument %s"), quote (argv[pos]));
 856
 857   test_exit (value ? TEST_TRUE : TEST_FALSE);
 858 }