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) 1987-2023 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 <https://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 /* Without this pragma, gcc 4.6.2 20111027 mistakenly suggests that
  24    the advance function might be candidate for attribute 'pure'.  */
  25 #if (__GNUC__ == 4 && 6 <= __GNUC_MINOR__) || 4 < __GNUC__
  26 # pragma GCC diagnostic ignored "-Wsuggest-attribute=pure"
  27 #endif
  28
  29 #include <config.h>
  30 #include <stdio.h>
  31 #include <sys/types.h>
  32
  33 #define TEST_STANDALONE 1
  34
  35 #ifndef LBRACKET
  36 # define LBRACKET 0
  37 #endif
  38
  39 /* The official name of this program (e.g., no 'g' prefix).  */
  40 #if LBRACKET
  41 # define PROGRAM_NAME "["
  42 #else
  43 # define PROGRAM_NAME "test"
  44 #endif
  45
  46 #include "system.h"
  47 #include "assure.h"
  48 #include "quote.h"
  49 #include "stat-time.h"
  50 #include "strnumcmp.h"
  51
  52 #include <stdarg.h>
  53 #include "verror.h"
  54
  55 #if HAVE_SYS_PARAM_H
  56 # include <sys/param.h>
  57 #endif
  58
  59 /* Exit status for syntax errors, etc.  */
  60 enum { TEST_TRUE, TEST_FALSE, TEST_FAILURE };
  61
  62 #if defined TEST_STANDALONE
  63 # define test_exit(val) exit (val)
  64 # define test_main_return(val) return val
  65 #else
  66    static jmp_buf test_exit_buf;
  67    static int test_error_return = 0;
  68 # define test_exit(val) test_error_return = val, longjmp (test_exit_buf, 1)
  69 # define test_main_return(val) test_exit (val)
  70 #endif /* !TEST_STANDALONE */
  71
  72 static int pos;         /* The offset of the current argument in ARGV. */
  73 static int argc;        /* The number of arguments present in ARGV. */
  74 static char **argv;     /* The argument list. */
  75
  76 static bool unary_operator (void);
  77 static bool binary_operator (bool);
  78 static bool two_arguments (void);
  79 static bool three_arguments (void);
  80 static bool posixtest (int);
  81
  82 static bool expr (void);
  83 static bool term (void);
  84 static bool and (void);
  85 static bool or (void);
  86
  87 static void beyond (void);
  88
  89 ATTRIBUTE_FORMAT ((printf, 1, 2))
  90 static _Noreturn void
  91 test_syntax_error (char const *format, ...)
  92 {
  93   va_list ap;
  94   va_start (ap, format);
  95   verror (0, 0, format, ap);
  96   test_exit (TEST_FAILURE);
  97 }
  98
  99 /* Increment our position in the argument list.  Check that we're not
 100    past the end of the argument list.  This check is suppressed if the
 101    argument is false.  */
 102
 103 static void
 104 advance (bool f)
 105 {
 106   ++pos;
 107
 108   if (f && pos >= argc)
 109     beyond ();
 110 }
 111
 112 static void
 113 unary_advance (void)
 114 {
 115   advance (true);
 116   ++pos;
 117 }
 118
 119 /*
 120  * beyond - call when we're beyond the end of the argument list (an
 121  *      error condition)
 122  */
 123 static _Noreturn void
 124 beyond (void)
 125 {
 126   test_syntax_error (_("missing argument after %s"), quote (argv[argc - 1]));
 127 }
 128
 129 /* If the characters pointed to by STRING constitute a valid number,
 130    return a pointer to the start of the number, skipping any blanks or
 131    leading '+'.  Otherwise, report an error and exit.  */
 132 static char const *
 133 find_int (char const *string)
 134 {
 135   char const *p;
 136   char const *number_start;
 137
 138   for (p = string; isblank (to_uchar (*p)); p++)
 139     continue;
 140
 141   if (*p == '+')
 142     {
 143       p++;
 144       number_start = p;
 145     }
 146   else
 147     {
 148       number_start = p;
 149       p += (*p == '-');
 150     }
 151
 152   if (ISDIGIT (*p++))
 153     {
 154       while (ISDIGIT (*p))
 155         p++;
 156       while (isblank (to_uchar (*p)))
 157         p++;
 158       if (!*p)
 159         return number_start;
 160     }
 161
 162   test_syntax_error (_("invalid integer %s"), quote (string));
 163 }
 164
 165 /* Find the modification time of FILE, and stuff it into *MTIME.
 166    Return true if successful.  */
 167 static bool
 168 get_mtime (char const *filename, struct timespec *mtime)
 169 {
 170   struct stat finfo;
 171   bool ok = (stat (filename, &finfo) == 0);
 172   if (ok)
 173     *mtime = get_stat_mtime (&finfo);
 174   return ok;
 175 }
 176
 177 /* Return true if S is one of the test command's binary operators.  */
 178 static bool
 179 binop (char const *s)
 180 {
 181   return ((STREQ (s,   "=")) || (STREQ (s,  "!=")) || (STREQ (s, "==")) ||
 182           (STREQ (s,   "-nt")) ||
 183           (STREQ (s, "-ot")) || (STREQ (s, "-ef")) || (STREQ (s, "-eq")) ||
 184           (STREQ (s, "-ne")) || (STREQ (s, "-lt")) || (STREQ (s, "-le")) ||
 185           (STREQ (s, "-gt")) || (STREQ (s, "-ge")));
 186 }
 187
 188 /*
 189  * term - parse a term and return 1 or 0 depending on whether the term
 190  *      evaluates to true or false, respectively.
 191  *
 192  * term ::=
 193  *      '-'('h'|'d'|'f'|'r'|'s'|'w'|'c'|'b'|'p'|'u'|'g'|'k') filename
 194  *      '-'('L'|'x') filename
 195  *      '-t' int
 196  *      '-'('z'|'n') string
 197  *      string
 198  *      string ('!='|'=') string
 199  *      <int> '-'(eq|ne|le|lt|ge|gt) <int>
 200  *      file '-'(nt|ot|ef) file
 201  *      '(' <expr> ')'
 202  * int ::=
 203  *      '-l' string
 204  *      positive and negative integers
 205  */
 206 static bool
 207 term (void)
 208 {
 209   bool value;
 210   bool negated = false;
 211
 212   /* Deal with leading 'not's.  */
 213   while (pos < argc && argv[pos][0] == '!' && argv[pos][1] == '\0')
 214     {
 215       advance (true);
 216       negated = !negated;
 217     }
 218
 219   if (pos >= argc)
 220     beyond ();
 221
 222   /* A paren-bracketed argument. */
 223   if (argv[pos][0] == '(' && argv[pos][1] == '\0')
 224     {
 225       int nargs;
 226
 227       advance (true);
 228
 229       for (nargs = 1;
 230            pos + nargs < argc && ! STREQ (argv[pos + nargs], ")");
 231            nargs++)
 232         if (nargs == 4)
 233           {
 234             nargs = argc - pos;
 235             break;
 236           }
 237
 238       value = posixtest (nargs);
 239       if (argv[pos] == 0)
 240         test_syntax_error (_("%s expected"), quote (")"));
 241       else
 242         if (argv[pos][0] != ')' || argv[pos][1])
 243           test_syntax_error (_("%s expected, found %s"),
 244                              quote_n (0, ")"), quote_n (1, argv[pos]));
 245       advance (false);
 246     }
 247
 248   /* Are there enough arguments left that this could be dyadic?  */
 249   else if (4 <= argc - pos && STREQ (argv[pos], "-l") && binop (argv[pos + 2]))
 250     value = binary_operator (true);
 251   else if (3 <= argc - pos && binop (argv[pos + 1]))
 252     value = binary_operator (false);
 253
 254   /* It might be a switch type argument.  */
 255   else if (argv[pos][0] == '-' && argv[pos][1] && argv[pos][2] == '\0')
 256     value = unary_operator ();
 257   else
 258     {
 259       value = (argv[pos][0] != '\0');
 260       advance (false);
 261     }
 262
 263   return negated ^ value;
 264 }
 265
 266 static bool
 267 binary_operator (bool l_is_l)
 268 {
 269   int op;
 270   struct stat stat_buf, stat_spare;
 271   /* Is the right integer expression of the form '-l string'? */
 272   bool r_is_l;
 273
 274   if (l_is_l)
 275     advance (false);
 276   op = pos + 1;
 277
 278   if ((op < argc - 2) && STREQ (argv[op + 1], "-l"))
 279     {
 280       r_is_l = true;
 281       advance (false);
 282     }
 283   else
 284     r_is_l = false;
 285
 286   if (argv[op][0] == '-')
 287     {
 288       /* check for eq, nt, and stuff */
 289       if ((((argv[op][1] == 'l' || argv[op][1] == 'g')
 290             && (argv[op][2] == 'e' || argv[op][2] == 't'))
 291            || (argv[op][1] == 'e' && argv[op][2] == 'q')
 292            || (argv[op][1] == 'n' && argv[op][2] == 'e'))
 293           && !argv[op][3])
 294         {
 295           char lbuf[INT_BUFSIZE_BOUND (uintmax_t)];
 296           char rbuf[INT_BUFSIZE_BOUND (uintmax_t)];
 297           char const *l = (l_is_l
 298                            ? umaxtostr (strlen (argv[op - 1]), lbuf)
 299                            : find_int (argv[op - 1]));
 300           char const *r = (r_is_l
 301                            ? umaxtostr (strlen (argv[op + 2]), rbuf)
 302                            : find_int (argv[op + 1]));
 303           int cmp = strintcmp (l, r);
 304           bool xe_operator = (argv[op][2] == 'e');
 305           pos += 3;
 306           return (argv[op][1] == 'l' ? cmp < xe_operator
 307                   : argv[op][1] == 'g' ? cmp > - xe_operator
 308                   : (cmp != 0) == xe_operator);
 309         }
 310
 311       switch (argv[op][1])
 312         {
 313         default:
 314           break;
 315
 316         case 'n':
 317           if (argv[op][2] == 't' && !argv[op][3])
 318             {
 319               /* nt - newer than */
 320               struct timespec lt, rt;
 321               bool le, re;
 322               pos += 3;
 323               if (l_is_l || r_is_l)
 324                 test_syntax_error (_("-nt does not accept -l"));
 325               le = get_mtime (argv[op - 1], &lt);
 326               re = get_mtime (argv[op + 1], &rt);
 327               return le && (!re || timespec_cmp (lt, rt) > 0);
 328             }
 329           break;
 330
 331         case 'e':
 332           if (argv[op][2] == 'f' && !argv[op][3])
 333             {
 334               /* ef - hard link? */
 335               pos += 3;
 336               if (l_is_l || r_is_l)
 337                 test_syntax_error (_("-ef does not accept -l"));
 338               return (stat (argv[op - 1], &stat_buf) == 0
 339                       && stat (argv[op + 1], &stat_spare) == 0
 340                       && stat_buf.st_dev == stat_spare.st_dev
 341                       && stat_buf.st_ino == stat_spare.st_ino);
 342             }
 343           break;
 344
 345         case 'o':
 346           if ('t' == argv[op][2] && '\000' == argv[op][3])
 347             {
 348               /* ot - older than */
 349               struct timespec lt, rt;
 350               bool le, re;
 351               pos += 3;
 352               if (l_is_l || r_is_l)
 353                 test_syntax_error (_("-ot does not accept -l"));
 354               le = get_mtime (argv[op - 1], &lt);
 355               re = get_mtime (argv[op + 1], &rt);
 356               return re && (!le || timespec_cmp (lt, rt) < 0);
 357             }
 358           break;
 359         }
 360
 361       /* FIXME: is this dead code? */
 362       test_syntax_error (_("%s: unknown binary operator"), quote (argv[op]));
 363     }
 364
 365   if (argv[op][0] == '='
 366       && (!argv[op][1] || ((argv[op][1] == '=') && !argv[op][2])))
 367     {
 368       bool value = STREQ (argv[pos], argv[pos + 2]);
 369       pos += 3;
 370       return value;
 371     }
 372
 373   if (STREQ (argv[op], "!="))
 374     {
 375       bool value = !STREQ (argv[pos], argv[pos + 2]);
 376       pos += 3;
 377       return value;
 378     }
 379
 380   /* Not reached.  */
 381   affirm (false);
 382 }
 383
 384 static bool
 385 unary_operator (void)
 386 {
 387   struct stat stat_buf;
 388
 389   switch (argv[pos][1])
 390     {
 391     default:
 392       test_syntax_error (_("%s: unary operator expected"), quote (argv[pos]));
 393       return false;
 394
 395       /* All of the following unary operators use unary_advance (), which
 396          checks to make sure that there is an argument, and then advances
 397          pos right past it.  This means that pos - 1 is the location of the
 398          argument. */
 399
 400     case 'e':                   /* file exists in the file system? */
 401       unary_advance ();
 402       return stat (argv[pos - 1], &stat_buf) == 0;
 403
 404     case 'r':                   /* file is readable? */
 405       unary_advance ();
 406       return euidaccess (argv[pos - 1], R_OK) == 0;
 407
 408     case 'w':                   /* File is writable? */
 409       unary_advance ();
 410       return euidaccess (argv[pos - 1], W_OK) == 0;
 411
 412     case 'x':                   /* File is executable? */
 413       unary_advance ();
 414       return euidaccess (argv[pos - 1], X_OK) == 0;
 415
 416     case 'N':  /* File exists and has been modified since it was last read? */
 417       {
 418         unary_advance ();
 419         if (stat (argv[pos - 1], &stat_buf) != 0)
 420           return false;
 421         struct timespec atime = get_stat_atime (&stat_buf);
 422         struct timespec mtime = get_stat_mtime (&stat_buf);
 423         return (timespec_cmp (mtime, atime) > 0);
 424       }
 425
 426     case 'O':                   /* File is owned by you? */
 427       {
 428         unary_advance ();
 429         if (stat (argv[pos - 1], &stat_buf) != 0)
 430           return false;
 431         errno = 0;
 432         uid_t euid = geteuid ();
 433         uid_t NO_UID = -1;
 434         return ! (euid == NO_UID && errno) && euid == stat_buf.st_uid;
 435       }
 436
 437     case 'G':                   /* File is owned by your group? */
 438       {
 439         unary_advance ();
 440         if (stat (argv[pos - 1], &stat_buf) != 0)
 441           return false;
 442         errno = 0;
 443         gid_t egid = getegid ();
 444         gid_t NO_GID = -1;
 445         return ! (egid == NO_GID && errno) && egid == stat_buf.st_gid;
 446       }
 447
 448     case 'f':                   /* File is a file? */
 449       unary_advance ();
 450       /* Under POSIX, -f is true if the given file exists
 451          and is a regular file. */
 452       return (stat (argv[pos - 1], &stat_buf) == 0
 453               && S_ISREG (stat_buf.st_mode));
 454
 455     case 'd':                   /* File is a directory? */
 456       unary_advance ();
 457       return (stat (argv[pos - 1], &stat_buf) == 0
 458               && S_ISDIR (stat_buf.st_mode));
 459
 460     case 's':                   /* File has something in it? */
 461       unary_advance ();
 462       return (stat (argv[pos - 1], &stat_buf) == 0
 463               && 0 < stat_buf.st_size);
 464
 465     case 'S':                   /* File is a socket? */
 466       unary_advance ();
 467       return (stat (argv[pos - 1], &stat_buf) == 0
 468               && S_ISSOCK (stat_buf.st_mode));
 469
 470     case 'c':                   /* File is character special? */
 471       unary_advance ();
 472       return (stat (argv[pos - 1], &stat_buf) == 0
 473               && S_ISCHR (stat_buf.st_mode));
 474
 475     case 'b':                   /* File is block special? */
 476       unary_advance ();
 477       return (stat (argv[pos - 1], &stat_buf) == 0
 478               && S_ISBLK (stat_buf.st_mode));
 479
 480     case 'p':                   /* File is a named pipe? */
 481       unary_advance ();
 482       return (stat (argv[pos - 1], &stat_buf) == 0
 483               && S_ISFIFO (stat_buf.st_mode));
 484
 485     case 'L':                   /* Same as -h  */
 486       /*FALLTHROUGH*/
 487
 488     case 'h':                   /* File is a symbolic link? */
 489       unary_advance ();
 490       return (lstat (argv[pos - 1], &stat_buf) == 0
 491               && S_ISLNK (stat_buf.st_mode));
 492
 493     case 'u':                   /* File is setuid? */
 494       unary_advance ();
 495       return (stat (argv[pos - 1], &stat_buf) == 0
 496               && (stat_buf.st_mode & S_ISUID));
 497
 498     case 'g':                   /* File is setgid? */
 499       unary_advance ();
 500       return (stat (argv[pos - 1], &stat_buf) == 0
 501               && (stat_buf.st_mode & S_ISGID));
 502
 503     case 'k':                   /* File has sticky bit set? */
 504       unary_advance ();
 505       return (stat (argv[pos - 1], &stat_buf) == 0
 506               && (stat_buf.st_mode & S_ISVTX));
 507
 508     case 't':                   /* File (fd) is a terminal? */
 509       {
 510         long int fd;
 511         char const *arg;
 512         unary_advance ();
 513         arg = find_int (argv[pos - 1]);
 514         errno = 0;
 515         fd = strtol (arg, nullptr, 10);
 516         return (errno != ERANGE && 0 <= fd && fd <= INT_MAX && isatty (fd));
 517       }
 518
 519     case 'n':                   /* True if arg has some length. */
 520       unary_advance ();
 521       return argv[pos - 1][0] != 0;
 522
 523     case 'z':                   /* True if arg has no length. */
 524       unary_advance ();
 525       return argv[pos - 1][0] == '\0';
 526     }
 527 }
 528
 529 /*
 530  * and:
 531  *      term
 532  *      term '-a' and
 533  */
 534 static bool
 535 and (void)
 536 {
 537   bool value = true;
 538
 539   while (true)
 540     {
 541       value &= term ();
 542       if (! (pos < argc && STREQ (argv[pos], "-a")))
 543         return value;
 544       advance (false);
 545     }
 546 }
 547
 548 /*
 549  * or:
 550  *      and
 551  *      and '-o' or
 552  */
 553 static bool
 554 or (void)
 555 {
 556   bool value = false;
 557
 558   while (true)
 559     {
 560       value |= and ();
 561       if (! (pos < argc && STREQ (argv[pos], "-o")))
 562         return value;
 563       advance (false);
 564     }
 565 }
 566
 567 /*
 568  * expr:
 569  *      or
 570  */
 571 static bool
 572 expr (void)
 573 {
 574   if (pos >= argc)
 575     beyond ();
 576
 577   return or ();         /* Same with this. */
 578 }
 579
 580 static bool
 581 one_argument (void)
 582 {
 583   return argv[pos++][0] != '\0';
 584 }
 585
 586 static bool
 587 two_arguments (void)
 588 {
 589   bool value;
 590
 591   if (STREQ (argv[pos], "!"))
 592     {
 593       advance (false);
 594       value = ! one_argument ();
 595     }
 596   else if (argv[pos][0] == '-'
 597            && argv[pos][1] != '\0'
 598            && argv[pos][2] == '\0')
 599     {
 600       value = unary_operator ();
 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"),
 629                        quote (argv[pos + 1]));
 630   return (value);
 631 }
 632
 633 /* This is an implementation of a Posix.2 proposal by David Korn. */
 634 static bool
 635 posixtest (int nargs)
 636 {
 637   bool value;
 638
 639   switch (nargs)
 640     {
 641       case 1:
 642         value = one_argument ();
 643         break;
 644
 645       case 2:
 646         value = two_arguments ();
 647         break;
 648
 649       case 3:
 650         value = three_arguments ();
 651         break;
 652
 653       case 4:
 654         if (STREQ (argv[pos], "!"))
 655           {
 656             advance (true);
 657             value = !three_arguments ();
 658             break;
 659           }
 660         if (STREQ (argv[pos], "(") && STREQ (argv[pos + 3], ")"))
 661           {
 662             advance (false);
 663             value = two_arguments ();
 664             advance (false);
 665             break;
 666           }
 667         FALLTHROUGH;
 668       case 5:
 669       default:
 670         affirm (0 < nargs);
 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     emit_try_help ();
 684   else
 685     {
 686       fputs (_("\
 687 Usage: test EXPRESSION\n\
 688   or:  test\n\
 689   or:  [ EXPRESSION ]\n\
 690   or:  [ ]\n\
 691   or:  [ OPTION\n\
 692 "), stdout);
 693       fputs (_("\
 694 Exit with the status determined by EXPRESSION.\n\
 695 \n\
 696 "), stdout);
 697       fputs (HELP_OPTION_DESCRIPTION, stdout);
 698       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 699       fputs (_("\
 700 \n\
 701 An omitted EXPRESSION defaults to false.  Otherwise,\n\
 702 EXPRESSION is true or false and sets exit status.  It is one of:\n\
 703 "), stdout);
 704       fputs (_("\
 705 \n\
 706   ( EXPRESSION )               EXPRESSION is true\n\
 707   ! EXPRESSION                 EXPRESSION is false\n\
 708   EXPRESSION1 -a EXPRESSION2   both EXPRESSION1 and EXPRESSION2 are true\n\
 709   EXPRESSION1 -o EXPRESSION2   either EXPRESSION1 or EXPRESSION2 is true\n\
 710 "), stdout);
 711       fputs (_("\
 712 \n\
 713   -n STRING            the length of STRING is nonzero\n\
 714   STRING               equivalent to -n STRING\n\
 715   -z STRING            the length of STRING is zero\n\
 716   STRING1 = STRING2    the strings are equal\n\
 717   STRING1 != STRING2   the strings are not equal\n\
 718 "), stdout);
 719       fputs (_("\
 720 \n\
 721   INTEGER1 -eq INTEGER2   INTEGER1 is equal to INTEGER2\n\
 722   INTEGER1 -ge INTEGER2   INTEGER1 is greater than or equal to INTEGER2\n\
 723   INTEGER1 -gt INTEGER2   INTEGER1 is greater than INTEGER2\n\
 724   INTEGER1 -le INTEGER2   INTEGER1 is less than or equal to INTEGER2\n\
 725   INTEGER1 -lt INTEGER2   INTEGER1 is less than INTEGER2\n\
 726   INTEGER1 -ne INTEGER2   INTEGER1 is not equal to INTEGER2\n\
 727 "), stdout);
 728       fputs (_("\
 729 \n\
 730   FILE1 -ef FILE2   FILE1 and FILE2 have the same device and inode numbers\n\
 731   FILE1 -nt FILE2   FILE1 is newer (modification date) than FILE2\n\
 732   FILE1 -ot FILE2   FILE1 is older than FILE2\n\
 733 "), stdout);
 734       fputs (_("\
 735 \n\
 736   -b FILE     FILE exists and is block special\n\
 737   -c FILE     FILE exists and is character special\n\
 738   -d FILE     FILE exists and is a directory\n\
 739   -e FILE     FILE exists\n\
 740 "), stdout);
 741       fputs (_("\
 742   -f FILE     FILE exists and is a regular file\n\
 743   -g FILE     FILE exists and is set-group-ID\n\
 744   -G FILE     FILE exists and is owned by the effective group ID\n\
 745   -h FILE     FILE exists and is a symbolic link (same as -L)\n\
 746   -k FILE     FILE exists and has its sticky bit set\n\
 747 "), stdout);
 748       fputs (_("\
 749   -L FILE     FILE exists and is a symbolic link (same as -h)\n\
 750   -N FILE     FILE exists and has been modified since it was last read\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 the user has read access\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 the user has write access\n\
 761   -x FILE     FILE exists and the user has execute (or search) access\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: Binary -a and -o are inherently ambiguous.  Use 'test EXPR1 && test\n\
 772 EXPR2' or 'test EXPR1 || test EXPR2' instead.\n\
 773 "), stdout);
 774       fputs (_("\
 775 \n\
 776 NOTE: [ honors the --help and --version options, but test does not.\n\
 777 test treats each of those as it treats any other nonempty STRING.\n\
 778 "), stdout);
 779       printf (USAGE_BUILTIN_WARNING, _("test and/or ["));
 780       emit_ancillary_info (PROGRAM_NAME);
 781     }
 782   exit (status);
 783 }
 784 #endif /* TEST_STANDALONE */
 785
 786 #if !defined TEST_STANDALONE
 787 # define main test_command
 788 #endif
 789
 790 #define AUTHORS \
 791   proper_name ("Kevin Braunsdorf"), \
 792   proper_name ("Matthew Bradburn")
 793
 794 /*
 795  * [:
 796  *      '[' expr ']'
 797  * test:
 798  *      test expr
 799  */
 800 int
 801 main (int margc, char **margv)
 802 {
 803   bool value;
 804
 805 #if !defined TEST_STANDALONE
 806   int code;
 807
 808   code = setjmp (test_exit_buf);
 809
 810   if (code)
 811     return (test_error_return);
 812 #else /* TEST_STANDALONE */
 813   initialize_main (&margc, &margv);
 814   set_program_name (margv[0]);
 815   setlocale (LC_ALL, "");
 816   bindtextdomain (PACKAGE, LOCALEDIR);
 817   textdomain (PACKAGE);
 818
 819   initialize_exit_failure (TEST_FAILURE);
 820   atexit (close_stdout);
 821 #endif /* TEST_STANDALONE */
 822
 823   argv = margv;
 824
 825   if (LBRACKET)
 826     {
 827       /* Recognize --help or --version, but only when invoked in the
 828          "[" form, when the last argument is not "]".  Use direct
 829          parsing, rather than parse_long_options, to avoid accepting
 830          abbreviations.  POSIX allows "[ --help" and "[ --version" to
 831          have the usual GNU behavior, but it requires "test --help"
 832          and "test --version" to exit silently with status 0.  */
 833       if (margc == 2)
 834         {
 835           if (STREQ (margv[1], "--help"))
 836             usage (EXIT_SUCCESS);
 837
 838           if (STREQ (margv[1], "--version"))
 839             {
 840               version_etc (stdout, PROGRAM_NAME, PACKAGE_NAME, Version, AUTHORS,
 841                            (char *) nullptr);
 842               test_main_return (EXIT_SUCCESS);
 843             }
 844         }
 845       if (margc < 2 || !STREQ (margv[margc - 1], "]"))
 846         test_syntax_error (_("missing %s"), quote ("]"));
 847
 848       --margc;
 849     }
 850
 851   argc = margc;
 852   pos = 1;
 853
 854   if (pos >= argc)
 855     test_main_return (TEST_FALSE);
 856
 857   value = posixtest (argc - 1);
 858
 859   if (pos != argc)
 860     test_syntax_error (_("extra argument %s"), quote (argv[pos]));
 861
 862   test_main_return (value ? TEST_TRUE : TEST_FALSE);
 863 }