test.c

   1 /* test.c - GNU test program (ksb and mjb) */
   2
   3 /* Modified to run with the GNU shell Apr 25, 1988 by bfox. */
   4
   5 /* Copyright (C) 1987-2010 Free Software Foundation, Inc.
   6
   7    This file is part of GNU Bash, the Bourne Again SHell.
   8
   9    Bash is free software: you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation, either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    Bash is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /* Define PATTERN_MATCHING to get the csh-like =~ and !~ pattern-matching
  24    binary operators. */
  25 /* #define PATTERN_MATCHING */
  26
  27 #if defined (HAVE_CONFIG_H)
  28 #  include <config.h>
  29 #endif
  30
  31 #include <stdio.h>
  32
  33 #include "bashtypes.h"
  34
  35 #if !defined (HAVE_LIMITS_H)
  36 #  include <sys/param.h>
  37 #endif
  38
  39 #if defined (HAVE_UNISTD_H)
  40 #  include <unistd.h>
  41 #endif
  42
  43 #include <errno.h>
  44 #if !defined (errno)
  45 extern int errno;
  46 #endif /* !errno */
  47
  48 #if !defined (_POSIX_VERSION) && defined (HAVE_SYS_FILE_H)
  49 #  include <sys/file.h>
  50 #endif /* !_POSIX_VERSION */
  51 #include "posixstat.h"
  52 #include "filecntl.h"
  53
  54 #include "bashintl.h"
  55
  56 #include "shell.h"
  57 #include "pathexp.h"
  58 #include "test.h"
  59 #include "builtins/common.h"
  60
  61 #include <glob/strmatch.h>
  62
  63 #if !defined (STRLEN)
  64 #  define STRLEN(s) ((s)[0] ? ((s)[1] ? ((s)[2] ? strlen(s) : 2) : 1) : 0)
  65 #endif
  66
  67 #if !defined (STREQ)
  68 #  define STREQ(a, b) ((a)[0] == (b)[0] && strcmp ((a), (b)) == 0)
  69 #endif /* !STREQ */
  70 #define STRCOLLEQ(a, b) ((a)[0] == (b)[0] && strcoll ((a), (b)) == 0)
  71
  72 #if !defined (R_OK)
  73 #define R_OK 4
  74 #define W_OK 2
  75 #define X_OK 1
  76 #define F_OK 0
  77 #endif /* R_OK */
  78
  79 #define EQ      0
  80 #define NE      1
  81 #define LT      2
  82 #define GT      3
  83 #define LE      4
  84 #define GE      5
  85
  86 #define NT      0
  87 #define OT      1
  88 #define EF      2
  89
  90 /* The following few defines control the truth and false output of each stage.
  91    TRUE and FALSE are what we use to compute the final output value.
  92    SHELL_BOOLEAN is the form which returns truth or falseness in shell terms.
  93    Default is TRUE = 1, FALSE = 0, SHELL_BOOLEAN = (!value). */
  94 #define TRUE 1
  95 #define FALSE 0
  96 #define SHELL_BOOLEAN(value) (!(value))
  97
  98 #define TEST_ERREXIT_STATUS     2
  99
 100 static procenv_t test_exit_buf;
 101 static int test_error_return;
 102 #define test_exit(val) \
 103         do { test_error_return = val; longjmp (test_exit_buf, 1); } while (0)
 104
 105 extern int sh_stat __P((const char *, struct stat *));
 106
 107 static int pos;         /* The offset of the current argument in ARGV. */
 108 static int argc;        /* The number of arguments present in ARGV. */
 109 static char **argv;     /* The argument list. */
 110 static int noeval;
 111
 112 static void test_syntax_error __P((char *, char *)) __attribute__((__noreturn__));
 113 static void beyond __P((void)) __attribute__((__noreturn__));
 114 static void integer_expected_error __P((char *)) __attribute__((__noreturn__));
 115
 116 static int unary_operator __P((void));
 117 static int binary_operator __P((void));
 118 static int two_arguments __P((void));
 119 static int three_arguments __P((void));
 120 static int posixtest __P((void));
 121
 122 static int expr __P((void));
 123 static int term __P((void));
 124 static int and __P((void));
 125 static int or __P((void));
 126
 127 static int filecomp __P((char *, char *, int));
 128 static int arithcomp __P((char *, char *, int, int));
 129 static int patcomp __P((char *, char *, int));
 130
 131 static void
 132 test_syntax_error (format, arg)
 133      char *format, *arg;
 134 {
 135   builtin_error (format, arg);
 136   test_exit (TEST_ERREXIT_STATUS);
 137 }
 138
 139 /*
 140  * beyond - call when we're beyond the end of the argument list (an
 141  *      error condition)
 142  */
 143 static void
 144 beyond ()
 145 {
 146   test_syntax_error (_("argument expected"), (char *)NULL);
 147 }
 148
 149 /* Syntax error for when an integer argument was expected, but
 150    something else was found. */
 151 static void
 152 integer_expected_error (pch)
 153      char *pch;
 154 {
 155   test_syntax_error (_("%s: integer expression expected"), pch);
 156 }
 157
 158 /* Increment our position in the argument list.  Check that we're not
 159    past the end of the argument list.  This check is supressed if the
 160    argument is FALSE.  Made a macro for efficiency. */
 161 #define advance(f) do { ++pos; if (f && pos >= argc) beyond (); } while (0)
 162 #define unary_advance() do { advance (1); ++pos; } while (0)
 163
 164 /*
 165  * expr:
 166  *      or
 167  */
 168 static int
 169 expr ()
 170 {
 171   if (pos >= argc)
 172     beyond ();
 173
 174   return (FALSE ^ or ());               /* Same with this. */
 175 }
 176
 177 /*
 178  * or:
 179  *      and
 180  *      and '-o' or
 181  */
 182 static int
 183 or ()
 184 {
 185   int value, v2;
 186
 187   value = and ();
 188   if (pos < argc && argv[pos][0] == '-' && argv[pos][1] == 'o' && !argv[pos][2])
 189     {
 190       advance (0);
 191       v2 = or ();
 192       return (value || v2);
 193     }
 194
 195   return (value);
 196 }
 197
 198 /*
 199  * and:
 200  *      term
 201  *      term '-a' and
 202  */
 203 static int
 204 and ()
 205 {
 206   int value, v2;
 207
 208   value = term ();
 209   if (pos < argc && argv[pos][0] == '-' && argv[pos][1] == 'a' && !argv[pos][2])
 210     {
 211       advance (0);
 212       v2 = and ();
 213       return (value && v2);
 214     }
 215   return (value);
 216 }
 217
 218 /*
 219  * term - parse a term and return 1 or 0 depending on whether the term
 220  *      evaluates to true or false, respectively.
 221  *
 222  * term ::=
 223  *      '-'('a'|'b'|'c'|'d'|'e'|'f'|'g'|'h'|'k'|'p'|'r'|'s'|'u'|'w'|'x') filename
 224  *      '-'('G'|'L'|'O'|'S'|'N') filename
 225  *      '-t' [int]
 226  *      '-'('z'|'n') string
 227  *      '-o' option
 228  *      string
 229  *      string ('!='|'='|'==') string
 230  *      <int> '-'(eq|ne|le|lt|ge|gt) <int>
 231  *      file '-'(nt|ot|ef) file
 232  *      '(' <expr> ')'
 233  * int ::=
 234  *      positive and negative integers
 235  */
 236 static int
 237 term ()
 238 {
 239   int value;
 240
 241   if (pos >= argc)
 242     beyond ();
 243
 244   /* Deal with leading `not's. */
 245   if (argv[pos][0] == '!' && argv[pos][1] == '\0')
 246     {
 247       value = 0;
 248       while (pos < argc && argv[pos][0] == '!' && argv[pos][1] == '\0')
 249         {
 250           advance (1);
 251           value = 1 - value;
 252         }
 253
 254       return (value ? !term() : term());
 255     }
 256
 257   /* A paren-bracketed argument. */
 258   if (argv[pos][0] == '(' && argv[pos][1] == '\0') /* ) */
 259     {
 260       advance (1);
 261       value = expr ();
 262       if (argv[pos] == 0) /* ( */
 263         test_syntax_error (_("`)' expected"), (char *)NULL);
 264       else if (argv[pos][0] != ')' || argv[pos][1]) /* ( */
 265         test_syntax_error (_("`)' expected, found %s"), argv[pos]);
 266       advance (0);
 267       return (value);
 268     }
 269
 270   /* are there enough arguments left that this could be dyadic? */
 271   if ((pos + 3 <= argc) && test_binop (argv[pos + 1]))
 272     value = binary_operator ();
 273
 274   /* Might be a switch type argument */
 275   else if (argv[pos][0] == '-' && argv[pos][2] == '\0')
 276     {
 277       if (test_unop (argv[pos]))
 278         value = unary_operator ();
 279       else
 280         test_syntax_error (_("%s: unary operator expected"), argv[pos]);
 281     }
 282   else
 283     {
 284       value = argv[pos][0] != '\0';
 285       advance (0);
 286     }
 287
 288   return (value);
 289 }
 290
 291 static int
 292 filecomp (s, t, op)
 293      char *s, *t;
 294      int op;
 295 {
 296   struct stat st1, st2;
 297   int r1, r2;
 298
 299   if ((r1 = sh_stat (s, &st1)) < 0)
 300     {
 301       if (op == EF)
 302         return (FALSE);
 303     }
 304   if ((r2 = sh_stat (t, &st2)) < 0)
 305     {
 306       if (op == EF)
 307         return (FALSE);
 308     }
 309
 310   switch (op)
 311     {
 312     case OT: return (r1 < r2 || (r2 == 0 && st1.st_mtime < st2.st_mtime));
 313     case NT: return (r1 > r2 || (r1 == 0 && st1.st_mtime > st2.st_mtime));
 314     case EF: return (same_file (s, t, &st1, &st2));
 315     }
 316   return (FALSE);
 317 }
 318
 319 static int
 320 arithcomp (s, t, op, flags)
 321      char *s, *t;
 322      int op, flags;
 323 {
 324   intmax_t l, r;
 325   int expok;
 326
 327   if (flags & TEST_ARITHEXP)
 328     {
 329       l = evalexp (s, &expok);
 330       if (expok == 0)
 331         return (FALSE);         /* should probably longjmp here */
 332       r = evalexp (t, &expok);
 333       if (expok == 0)
 334         return (FALSE);         /* ditto */
 335     }
 336   else
 337     {
 338       if (legal_number (s, &l) == 0)
 339         integer_expected_error (s);
 340       if (legal_number (t, &r) == 0)
 341         integer_expected_error (t);
 342     }
 343
 344   switch (op)
 345     {
 346     case EQ: return (l == r);
 347     case NE: return (l != r);
 348     case LT: return (l < r);
 349     case GT: return (l > r);
 350     case LE: return (l <= r);
 351     case GE: return (l >= r);
 352     }
 353
 354   return (FALSE);
 355 }
 356
 357 static int
 358 patcomp (string, pat, op)
 359      char *string, *pat;
 360      int op;
 361 {
 362   int m;
 363
 364   m = strmatch (pat, string, FNMATCH_EXTFLAG|FNMATCH_IGNCASE);
 365   return ((op == EQ) ? (m == 0) : (m != 0));
 366 }
 367
 368 int
 369 binary_test (op, arg1, arg2, flags)
 370      char *op, *arg1, *arg2;
 371      int flags;
 372 {
 373   int patmatch;
 374
 375   patmatch = (flags & TEST_PATMATCH);
 376
 377   if (op[0] == '=' && (op[1] == '\0' || (op[1] == '=' && op[2] == '\0')))
 378     return (patmatch ? patcomp (arg1, arg2, EQ) : STREQ (arg1, arg2));
 379   else if ((op[0] == '>' || op[0] == '<') && op[1] == '\0')
 380     {
 381       if (shell_compatibility_level > 40 && flags & TEST_LOCALE)
 382         return ((op[0] == '>') ? (strcoll (arg1, arg2) > 0) : (strcoll (arg1, arg2) < 0));
 383       else
 384         return ((op[0] == '>') ? (strcmp (arg1, arg2) > 0) : (strcmp (arg1, arg2) < 0));
 385     }
 386   else if (op[0] == '!' && op[1] == '=' && op[2] == '\0')
 387     return (patmatch ? patcomp (arg1, arg2, NE) : (STREQ (arg1, arg2) == 0));
 388
 389
 390   else if (op[2] == 't')
 391     {
 392       switch (op[1])
 393         {
 394         case 'n': return (filecomp (arg1, arg2, NT));           /* -nt */
 395         case 'o': return (filecomp (arg1, arg2, OT));           /* -ot */
 396         case 'l': return (arithcomp (arg1, arg2, LT, flags));   /* -lt */
 397         case 'g': return (arithcomp (arg1, arg2, GT, flags));   /* -gt */
 398         }
 399     }
 400   else if (op[1] == 'e')
 401     {
 402       switch (op[2])
 403         {
 404         case 'f': return (filecomp (arg1, arg2, EF));           /* -ef */
 405         case 'q': return (arithcomp (arg1, arg2, EQ, flags));   /* -eq */
 406         }
 407     }
 408   else if (op[2] == 'e')
 409     {
 410       switch (op[1])
 411         {
 412         case 'n': return (arithcomp (arg1, arg2, NE, flags));   /* -ne */
 413         case 'g': return (arithcomp (arg1, arg2, GE, flags));   /* -ge */
 414         case 'l': return (arithcomp (arg1, arg2, LE, flags));   /* -le */
 415         }
 416     }
 417
 418   return (FALSE);       /* should never get here */
 419 }
 420
 421
 422 static int
 423 binary_operator ()
 424 {
 425   int value;
 426   char *w;
 427
 428   w = argv[pos + 1];
 429   if ((w[0] == '=' && (w[1] == '\0' || (w[1] == '=' && w[2] == '\0'))) || /* =, == */
 430       ((w[0] == '>' || w[0] == '<') && w[1] == '\0') ||         /* <, > */
 431       (w[0] == '!' && w[1] == '=' && w[2] == '\0'))             /* != */
 432     {
 433       value = binary_test (w, argv[pos], argv[pos + 2], 0);
 434       pos += 3;
 435       return (value);
 436     }
 437
 438 #if defined (PATTERN_MATCHING)
 439   if ((w[0] == '=' || w[0] == '!') && w[1] == '~' && w[2] == '\0')
 440     {
 441       value = patcomp (argv[pos], argv[pos + 2], w[0] == '=' ? EQ : NE);
 442       pos += 3;
 443       return (value);
 444     }
 445 #endif
 446
 447   if ((w[0] != '-' || w[3] != '\0') || test_binop (w) == 0)
 448     {
 449       test_syntax_error (_("%s: binary operator expected"), w);
 450       /* NOTREACHED */
 451       return (FALSE);
 452     }
 453
 454   value = binary_test (w, argv[pos], argv[pos + 2], 0);
 455   pos += 3;
 456   return value;
 457 }
 458
 459 static int
 460 unary_operator ()
 461 {
 462   char *op;
 463   intmax_t r;
 464
 465   op = argv[pos];
 466   if (test_unop (op) == 0)
 467     return (FALSE);
 468
 469   /* the only tricky case is `-t', which may or may not take an argument. */
 470   if (op[1] == 't')
 471     {
 472       advance (0);
 473       if (pos < argc)
 474         {
 475           if (legal_number (argv[pos], &r))
 476             {
 477               advance (0);
 478               return (unary_test (op, argv[pos - 1]));
 479             }
 480           else
 481             return (FALSE);
 482         }
 483       else
 484         return (unary_test (op, "1"));
 485     }
 486
 487   /* All of the unary operators take an argument, so we first call
 488      unary_advance (), which checks to make sure that there is an
 489      argument, and then advances pos right past it.  This means that
 490      pos - 1 is the location of the argument. */
 491   unary_advance ();
 492   return (unary_test (op, argv[pos - 1]));
 493 }
 494
 495 int
 496 unary_test (op, arg)
 497      char *op, *arg;
 498 {
 499   intmax_t r;
 500   struct stat stat_buf;
 501   SHELL_VAR *v;
 502
 503   switch (op[1])
 504     {
 505     case 'a':                   /* file exists in the file system? */
 506     case 'e':
 507       return (sh_stat (arg, &stat_buf) == 0);
 508
 509     case 'r':                   /* file is readable? */
 510       return (sh_eaccess (arg, R_OK) == 0);
 511
 512     case 'w':                   /* File is writeable? */
 513       return (sh_eaccess (arg, W_OK) == 0);
 514
 515     case 'x':                   /* File is executable? */
 516       return (sh_eaccess (arg, X_OK) == 0);
 517
 518     case 'O':                   /* File is owned by you? */
 519       return (sh_stat (arg, &stat_buf) == 0 &&
 520               (uid_t) current_user.euid == (uid_t) stat_buf.st_uid);
 521
 522     case 'G':                   /* File is owned by your group? */
 523       return (sh_stat (arg, &stat_buf) == 0 &&
 524               (gid_t) current_user.egid == (gid_t) stat_buf.st_gid);
 525
 526     case 'N':
 527       return (sh_stat (arg, &stat_buf) == 0 &&
 528               stat_buf.st_atime <= stat_buf.st_mtime);
 529
 530     case 'f':                   /* File is a file? */
 531       if (sh_stat (arg, &stat_buf) < 0)
 532         return (FALSE);
 533
 534       /* -f is true if the given file exists and is a regular file. */
 535 #if defined (S_IFMT)
 536       return (S_ISREG (stat_buf.st_mode) || (stat_buf.st_mode & S_IFMT) == 0);
 537 #else
 538       return (S_ISREG (stat_buf.st_mode));
 539 #endif /* !S_IFMT */
 540
 541     case 'd':                   /* File is a directory? */
 542       return (sh_stat (arg, &stat_buf) == 0 && (S_ISDIR (stat_buf.st_mode)));
 543
 544     case 's':                   /* File has something in it? */
 545       return (sh_stat (arg, &stat_buf) == 0 && stat_buf.st_size > (off_t) 0);
 546
 547     case 'S':                   /* File is a socket? */
 548 #if !defined (S_ISSOCK)
 549       return (FALSE);
 550 #else
 551       return (sh_stat (arg, &stat_buf) == 0 && S_ISSOCK (stat_buf.st_mode));
 552 #endif /* S_ISSOCK */
 553
 554     case 'c':                   /* File is character special? */
 555       return (sh_stat (arg, &stat_buf) == 0 && S_ISCHR (stat_buf.st_mode));
 556
 557     case 'b':                   /* File is block special? */
 558       return (sh_stat (arg, &stat_buf) == 0 && S_ISBLK (stat_buf.st_mode));
 559
 560     case 'p':                   /* File is a named pipe? */
 561 #ifndef S_ISFIFO
 562       return (FALSE);
 563 #else
 564       return (sh_stat (arg, &stat_buf) == 0 && S_ISFIFO (stat_buf.st_mode));
 565 #endif /* S_ISFIFO */
 566
 567     case 'L':                   /* Same as -h  */
 568     case 'h':                   /* File is a symbolic link? */
 569 #if !defined (S_ISLNK) || !defined (HAVE_LSTAT)
 570       return (FALSE);
 571 #else
 572       return ((arg[0] != '\0') &&
 573               (lstat (arg, &stat_buf) == 0) && S_ISLNK (stat_buf.st_mode));
 574 #endif /* S_IFLNK && HAVE_LSTAT */
 575
 576     case 'u':                   /* File is setuid? */
 577       return (sh_stat (arg, &stat_buf) == 0 && (stat_buf.st_mode & S_ISUID) != 0);
 578
 579     case 'g':                   /* File is setgid? */
 580       return (sh_stat (arg, &stat_buf) == 0 && (stat_buf.st_mode & S_ISGID) != 0);
 581
 582     case 'k':                   /* File has sticky bit set? */
 583 #if !defined (S_ISVTX)
 584       /* This is not Posix, and is not defined on some Posix systems. */
 585       return (FALSE);
 586 #else
 587       return (sh_stat (arg, &stat_buf) == 0 && (stat_buf.st_mode & S_ISVTX) != 0);
 588 #endif
 589
 590     case 't':   /* File fd is a terminal? */
 591       if (legal_number (arg, &r) == 0)
 592         return (FALSE);
 593       return ((r == (int)r) && isatty ((int)r));
 594
 595     case 'n':                   /* True if arg has some length. */
 596       return (arg[0] != '\0');
 597
 598     case 'z':                   /* True if arg has no length. */
 599       return (arg[0] == '\0');
 600
 601     case 'o':                   /* True if option `arg' is set. */
 602       return (minus_o_option_value (arg) == 1);
 603
 604     case 'v':
 605       v = find_variable (arg);
 606       return (v && var_isset (v) ? TRUE : FALSE);
 607     }
 608
 609   /* We can't actually get here, but this shuts up gcc. */
 610   return (FALSE);
 611 }
 612
 613 /* Return TRUE if OP is one of the test command's binary operators. */
 614 int
 615 test_binop (op)
 616      char *op;
 617 {
 618   if (op[0] == '=' && op[1] == '\0')
 619     return (1);         /* '=' */
 620   else if ((op[0] == '<' || op[0] == '>') && op[1] == '\0')  /* string <, > */
 621     return (1);
 622   else if ((op[0] == '=' || op[0] == '!') && op[1] == '=' && op[2] == '\0')
 623     return (1);         /* `==' and `!=' */
 624 #if defined (PATTERN_MATCHING)
 625   else if (op[2] == '\0' && op[1] == '~' && (op[0] == '=' || op[0] == '!'))
 626     return (1);
 627 #endif
 628   else if (op[0] != '-' || op[2] == '\0' || op[3] != '\0')
 629     return (0);
 630   else
 631     {
 632       if (op[2] == 't')
 633         switch (op[1])
 634           {
 635           case 'n':             /* -nt */
 636           case 'o':             /* -ot */
 637           case 'l':             /* -lt */
 638           case 'g':             /* -gt */
 639             return (1);
 640           default:
 641             return (0);
 642           }
 643       else if (op[1] == 'e')
 644         switch (op[2])
 645           {
 646           case 'q':             /* -eq */
 647           case 'f':             /* -ef */
 648             return (1);
 649           default:
 650             return (0);
 651           }
 652       else if (op[2] == 'e')
 653         switch (op[1])
 654           {
 655           case 'n':             /* -ne */
 656           case 'g':             /* -ge */
 657           case 'l':             /* -le */
 658             return (1);
 659           default:
 660             return (0);
 661           }
 662       else
 663         return (0);
 664     }
 665 }
 666
 667 /* Return non-zero if OP is one of the test command's unary operators. */
 668 int
 669 test_unop (op)
 670      char *op;
 671 {
 672   if (op[0] != '-' || op[2] != 0)
 673     return (0);
 674
 675   switch (op[1])
 676     {
 677     case 'a': case 'b': case 'c': case 'd': case 'e':
 678     case 'f': case 'g': case 'h': case 'k': case 'n':
 679     case 'o': case 'p': case 'r': case 's': case 't':
 680     case 'u': case 'v': case 'w': case 'x': case 'z':
 681     case 'G': case 'L': case 'O': case 'S': case 'N':
 682       return (1);
 683     }
 684
 685   return (0);
 686 }
 687
 688 static int
 689 two_arguments ()
 690 {
 691   if (argv[pos][0] == '!' && argv[pos][1] == '\0')
 692     return (argv[pos + 1][0] == '\0');
 693   else if (argv[pos][0] == '-' && argv[pos][2] == '\0')
 694     {
 695       if (test_unop (argv[pos]))
 696         return (unary_operator ());
 697       else
 698         test_syntax_error (_("%s: unary operator expected"), argv[pos]);
 699     }
 700   else
 701     test_syntax_error (_("%s: unary operator expected"), argv[pos]);
 702
 703   return (0);
 704 }
 705
 706 #define ANDOR(s)  (s[0] == '-' && !s[2] && (s[1] == 'a' || s[1] == 'o'))
 707
 708 /* This could be augmented to handle `-t' as equivalent to `-t 1', but
 709    POSIX requires that `-t' be given an argument. */
 710 #define ONE_ARG_TEST(s)         ((s)[0] != '\0')
 711
 712 static int
 713 three_arguments ()
 714 {
 715   int value;
 716
 717   if (test_binop (argv[pos+1]))
 718     {
 719       value = binary_operator ();
 720       pos = argc;
 721     }
 722   else if (ANDOR (argv[pos+1]))
 723     {
 724       if (argv[pos+1][1] == 'a')
 725         value = ONE_ARG_TEST(argv[pos]) && ONE_ARG_TEST(argv[pos+2]);
 726       else
 727         value = ONE_ARG_TEST(argv[pos]) || ONE_ARG_TEST(argv[pos+2]);
 728       pos = argc;
 729     }
 730   else if (argv[pos][0] == '!' && argv[pos][1] == '\0')
 731     {
 732       advance (1);
 733       value = !two_arguments ();
 734     }
 735   else if (argv[pos][0] == '(' && argv[pos+2][0] == ')')
 736     {
 737       value = ONE_ARG_TEST(argv[pos+1]);
 738       pos = argc;
 739     }
 740   else
 741     test_syntax_error (_("%s: binary operator expected"), argv[pos+1]);
 742
 743   return (value);
 744 }
 745
 746 /* This is an implementation of a Posix.2 proposal by David Korn. */
 747 static int
 748 posixtest ()
 749 {
 750   int value;
 751
 752   switch (argc - 1)     /* one extra passed in */
 753     {
 754       case 0:
 755         value = FALSE;
 756         pos = argc;
 757         break;
 758
 759       case 1:
 760         value = ONE_ARG_TEST(argv[1]);
 761         pos = argc;
 762         break;
 763
 764       case 2:
 765         value = two_arguments ();
 766         pos = argc;
 767         break;
 768
 769       case 3:
 770         value = three_arguments ();
 771         break;
 772
 773       case 4:
 774         if (argv[pos][0] == '!' && argv[pos][1] == '\0')
 775           {
 776             advance (1);
 777             value = !three_arguments ();
 778             break;
 779           }
 780         /* FALLTHROUGH */
 781       default:
 782         value = expr ();
 783     }
 784
 785   return (value);
 786 }
 787
 788 /*
 789  * [:
 790  *      '[' expr ']'
 791  * test:
 792  *      test expr
 793  */
 794 int
 795 test_command (margc, margv)
 796      int margc;
 797      char **margv;
 798 {
 799   int value;
 800   int code;
 801
 802   USE_VAR(margc);
 803
 804   code = setjmp (test_exit_buf);
 805
 806   if (code)
 807     return (test_error_return);
 808
 809   argv = margv;
 810
 811   if (margv[0] && margv[0][0] == '[' && margv[0][1] == '\0')
 812     {
 813       --margc;
 814
 815       if (margv[margc] && (margv[margc][0] != ']' || margv[margc][1]))
 816         test_syntax_error (_("missing `]'"), (char *)NULL);
 817
 818       if (margc < 2)
 819         test_exit (SHELL_BOOLEAN (FALSE));
 820     }
 821
 822   argc = margc;
 823   pos = 1;
 824
 825   if (pos >= argc)
 826     test_exit (SHELL_BOOLEAN (FALSE));
 827
 828   noeval = 0;
 829   value = posixtest ();
 830
 831   if (pos != argc)
 832     test_syntax_error (_("too many arguments"), (char *)NULL);
 833
 834   test_exit (SHELL_BOOLEAN (value));
 835 }