/* GNU test program (ksb and mjb) */

/* Modified to run with the GNU shell by bfox. */

/* Copyright (C) 1987-1993, 1994 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash is free software; you can redistribute it and/or modify it under
   the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 2, or (at your option) any later
   version.

   Bash is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   for more details.

   You should have received a copy of the GNU General Public License along
   with Bash; see the file COPYING.  If not, write to the Free Software
   Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

/* Define TEST_STANDALONE to get the /bin/test version.  Otherwise, you get 
   the shell builtin version. */
/* #define TEST_STANDALONE */

#include <config.h>
#include <stdio.h>
#include <sys/types.h>

#if !defined (TEST_STANDALONE)
#  include "shell.h"
#  include "posixstat.h"
#  include "filecntl.h"
#else /* TEST_STANDALONE */
#  include "system.h"
#  include "version.h"
#  include "safe-stat.h"
#  include "safe-lstat.h"
#  include "group-member.h"
#  if !defined (S_IXUGO)
#    define S_IXUGO 0111
#  endif /* S_IXUGO */
#  if defined (_POSIX_VERSION)
#    include <limits.h>
#  else /* !_POSIX_VERSION */
#    include <sys/param.h>
#  endif /* _POSIX_VERSION */
#define whitespace(c) (((c) == ' ') || ((c) == '\t'))
#define digit(c)  ((c) >= '0' && (c) <= '9')
#define digit_value(c) ((c) - '0')
char *program_name;
#endif /* TEST_STANDALONE */

#if !defined (_POSIX_VERSION)
#  include <sys/file.h>
#endif /* !_POSIX_VERSION */

#include <errno.h>
#ifndef errno
extern int errno;
#endif

#if !defined (STREQ)
#  define STREQ(a, b) ((a)[0] == (b)[0] && strcmp (a, b) == 0)
#endif /* !STREQ */

#if !defined (member)
#  define member(c, s) ((c) ? (index ((s), (c)) ? 1 : 0) : 0)
#endif /* !member */

extern gid_t getgid (), getegid ();
extern uid_t geteuid ();

#if !defined (R_OK)
#define R_OK 4
#define W_OK 2
#define X_OK 1
#define F_OK 0
#endif /* R_OK */

/* This name is used solely when printing --version information.  */
#define COMMAND_NAME "test"

/* The following few defines control the truth and false output of each stage.
   TRUE and FALSE are what we use to compute the final output value.
   SHELL_BOOLEAN is the form which returns truth or falseness in shell terms.
   TRUTH_OR is how to do logical or with TRUE and FALSE.
   TRUTH_AND is how to do logical and with TRUE and FALSE..
   Default is TRUE = 1, FALSE = 0, TRUTH_OR = a | b, TRUTH_AND = a & b,
    SHELL_BOOLEAN = (!value). */
#define TRUE 1
#define FALSE 0
#define SHELL_BOOLEAN(value) (!(value))
#define TRUTH_OR(a, b) ((a) | (b))
#define TRUTH_AND(a, b) ((a) & (b))

#if defined (TEST_STANDALONE)
#  define test_exit(val) exit (val)
#else
   static jmp_buf test_exit_buf;
   static int test_error_return = 0;
#  define test_exit(val) test_error_return = val, longjmp (test_exit_buf, 1)
#endif /* !TEST_STANDALONE */

char *xrealloc ();

static int pos;		/* The offset of the current argument in ARGV. */
static int argc;	/* The number of arguments present in ARGV. */
static char **argv;	/* The argument list. */

static int unop ();
static int binop ();
static int unary_operator ();
static int binary_operator ();
static int two_arguments ();
static int three_arguments ();
static int posixtest ();

static int expr ();
static int term ();
static int and ();
static int or ();

#if __GNUC__ >= 2 && defined (__GNUC_MINOR__) \
    && __GNUC_MINOR__ >= 5 && !defined (__STRICT_ANSI__)
#define NO_RETURN_ATTRIBUTE __attribute__ ((noreturn))
#else
#define NO_RETURN_ATTRIBUTE /* empty */
#endif

static void test_syntax_error () NO_RETURN_ATTRIBUTE;
static void beyond () NO_RETURN_ATTRIBUTE;

static void
test_syntax_error (format, arg)
     char *format, *arg;
{
  fprintf (stderr, "%s: ", argv[0]);
  fprintf (stderr, format, arg);
  fflush (stderr);
  test_exit (SHELL_BOOLEAN (FALSE));
}

/* A wrapper for stat () which disallows pathnames that are empty strings. */
static int
test_stat (path, finfo)
     char *path;
     struct stat *finfo;
{
  if (*path == '\0')
    {
      errno = ENOENT;
      return (-1);
    }
  return (SAFE_STAT (path, finfo));
}

/* Do the same thing access(2) does, but use the effective uid and gid,
   and don't make the mistake of telling root that any file is
   executable. */
static int
eaccess (path, mode)
     char *path;
     int mode;
{
  struct stat st;
  static int euid = -1;

  if (test_stat (path, &st) < 0)
    return (-1);

  if (euid == -1)
    euid = geteuid ();

  if (euid == 0)
    {
      /* Root can read or write any file. */
      if (mode != X_OK)
	return (0);

      /* Root can execute any file that has any one of the execute
	 bits set. */
      if (st.st_mode & S_IXUGO)
	return (0);
    }

  if (st.st_uid == euid)        /* owner */
    mode <<= 6;
  else if (group_member (st.st_gid))
    mode <<= 3;

  if (st.st_mode & mode)
    return (0);

  return (-1);
}

/* Increment our position in the argument list.  Check that we're not
   past the end of the argument list.  This check is supressed if the
   argument is FALSE.  Made a macro for efficiency. */
#define advance(f)							\
  do									\
    {									\
      ++pos;								\
      if ((f) && pos >= argc)						\
	beyond ();							\
    }									\
  while (0)

#if !defined (advance)
static int
advance (f)
     int f;
{
  ++pos;

  if (f && pos >= argc)
    beyond ();
}
#endif /* advance */

#define unary_advance() 						\
  do									\
    {									\
      advance (1);							\
      ++pos;								\
    }									\
  while (0)

/*
 * beyond - call when we're beyond the end of the argument list (an
 *	error condition)
 */
static void
beyond ()
{
  test_syntax_error ("argument expected\n", (char *)NULL);
}

/* Syntax error for when an integer argument was expected, but
   something else was found. */
static void
integer_expected_error (pch)
     char *pch;
{
  test_syntax_error ("integer expression expected %s\n", pch);
}

/* Return non-zero if the characters pointed to by STRING constitute a
   valid number.  Stuff the converted number into RESULT if RESULT is
   a non-null pointer to a long. */
static int
isint (string, result)
     register char *string;
     long *result;
{
  int sign;
  long value;

  sign = 1;
  value = 0;

  if (result)
    *result = 0;

  /* Skip leading whitespace characters. */
  while (whitespace (*string))
    string++;

  if (!*string)
    return (0);

  /* We allow leading `-' or `+'. */
  if (*string == '-' || *string == '+')
    {
      if (!digit (string[1]))
	return (0);

      if (*string == '-')
	sign = -1;

      string++;
    }

  while (digit (*string))
    {
      if (result)
	value = (value * 10) + digit_value (*string);
      string++;
    }

  /* Skip trailing whitespace, if any. */
  while (whitespace (*string))
    string++;

  /* Error if not at end of string. */
  if (*string)
    return (0);

  if (result)
    {
      value *= sign;
      *result = value;
    }

  return (1);
}

/* Find the modification time of FILE, and stuff it into AGE, a pointer
   to a long.  Return non-zero if successful, else zero. */
static int
age_of (filename, age)
     char *filename;
     long *age;
{
  struct stat finfo;

  if (test_stat (filename, &finfo) < 0)
    return (0);

  if (age)
    *age = finfo.st_mtime;

  return (1);
}

/*
 * term - parse a term and return 1 or 0 depending on whether the term
 *	evaluates to true or false, respectively.
 *
 * term ::=
 *	'-'('h'|'d'|'f'|'r'|'s'|'w'|'c'|'b'|'p'|'u'|'g'|'k') filename
 *	'-'('L'|'x') filename
 * 	'-t' [ int ]
 *	'-'('z'|'n') string
 *	string
 *	string ('!='|'=') string
 *	<int> '-'(eq|ne|le|lt|ge|gt) <int>
 *	file '-'(nt|ot|ef) file
 *	'(' <expr> ')'
 * int ::=
 *	'-l' string
 *	positive and negative integers
 */
static int
term ()
{
  int value;

  if (pos >= argc)
    beyond ();

  /* Deal with leading "not"'s. */
  if ('!' == argv[pos][0] && '\000' == argv[pos][1])
    {
      value = FALSE;
      while (pos < argc && '!' == argv[pos][0] && '\000' == argv[pos][1])
	{
	  advance (1);
	  value ^= (TRUE);
	}

      return (value ^ (term ()));
    }

  /* A paren-bracketed argument. */  
  if (argv[pos][0] == '(' && !argv[pos][1])
    {
      advance (1);
      value = expr ();
      if (argv[pos][0] != ')' || argv[pos][1])
	test_syntax_error ("')' expected, found %s\n", argv[pos]);
      advance (0);
      return (TRUE == (value));
    }

  /* are there enough arguments left that this could be dyadic? */
  if (((pos + 3 <= argc) && binop (argv[pos + 1])) ||
      ((pos + 4 <= argc && STREQ (argv[pos], "-l") && binop (argv[pos + 2]))))
    value = binary_operator ();

  /* Might be a switch type argument */
  else if ('-' == argv[pos][0] && 0 == argv[pos][2])
    {
      if (unop (argv[pos][1]))
	value = unary_operator ();
      else
	test_syntax_error ("%s: unary operator expected\n", argv[pos]);
    }
  else
    {
      value = (argv[pos][0] != '\0');
      advance (0);
    }

  return (value);
}

static int
binary_operator ()
{
  register int op;
  struct stat stat_buf, stat_spare;
  long int l, r, value;
  /* Are the left and right integer expressions of the form '-l string'? */
  int l_is_l, r_is_l;

  if (strcmp (argv[pos], "-l") == 0)
    {
      l_is_l = 1;
      op = pos + 2;

      /* Make sure that OP is still a valid binary operator. */
      if ((op >= argc - 1) || (binop (argv[op]) == 0))
	test_syntax_error ("%s: binary operator expected\n", argv[op]);

      advance (0);
    }
  else
    {
      l_is_l = 0;
      op = pos + 1;
    }

  if ((op < argc - 2) && (strcmp (argv[op + 1], "-l") == 0))
    {
      r_is_l = 1;
      advance (0);
    }
  else
    r_is_l = 0;

  if (argv[op][0] == '-')
    {
      /* check for eq, nt, and stuff */
      switch (argv[op][1])
	{
	default:
	  break;

	case 'l':
	  if (argv[op][2] == 't' && !argv[op][3])
	    {
	      /* lt */
	      if (l_is_l)
		l = strlen (argv[op - 1]);
	      else
		{
		  if (!isint (argv[op - 1], &l))
		    integer_expected_error ("before -lt");
		}

	      if (r_is_l)
		r = strlen (argv[op + 2]);
	      else
		{
		  if (!isint (argv[op + 1], &r))
		    integer_expected_error ("after -lt");
		}
	      pos += 3;
	      return (TRUE == (l < r));
	    }

	  if (argv[op][2] == 'e' && !argv[op][3])
	    {
	      /* le */
	      if (l_is_l)
		l = strlen (argv[op - 1]);
	      else
		{
		  if (!isint (argv[op - 1], &l))
		    integer_expected_error ("before -le");
		}
	      if (r_is_l)
		r = strlen (argv[op + 2]);
	      else
		{
		  if (!isint (argv[op + 1], &r))
		    integer_expected_error ("after -le");
		}
	      pos += 3;
	      return (TRUE == (l <= r));
	    }
	  break;

	case 'g':
	  if (argv[op][2] == 't' && !argv[op][3])
	    {
	      /* gt integer greater than */
	      if (l_is_l)
		l = strlen (argv[op - 1]);
	      else
		{
		  if (!isint (argv[op - 1], &l))
		    integer_expected_error ("before -gt");
		}
	      if (r_is_l)
		r = strlen (argv[op + 2]);
	      else
		{
		  if (!isint (argv[op + 1], &r))
		    integer_expected_error ("after -gt");
		}
	      pos += 3;
	      return (TRUE == (l > r));
	    }

	  if (argv[op][2] == 'e' && !argv[op][3])
	    {
	      /* ge - integer greater than or equal to */
	      if (l_is_l)
		l = strlen (argv[op - 1]);
	      else
		{
		  if (!isint (argv[op - 1], &l))
		    integer_expected_error ("before -ge");
		}
	      if (r_is_l)
		r = strlen (argv[op + 2]);
	      else
		{
		  if (!isint (argv[op + 1], &r))
		    integer_expected_error ("after -ge");
		}
	      pos += 3;
	      return (TRUE == (l >= r));
	    }
	  break;

	case 'n':
	  if (argv[op][2] == 't' && !argv[op][3])
	    {
	      /* nt - newer than */
	      pos += 3;
	      if (l_is_l || r_is_l)
		test_syntax_error ("-nt does not accept -l\n", (char *)NULL);
	      if (age_of (argv[op - 1], &l) && age_of (argv[op + 1], &r))
		return (TRUE == (l > r));
	      else
		return (FALSE);
	    }

	  if (argv[op][2] == 'e' && !argv[op][3])
	    {
	      /* ne - integer not equal */
	      if (l_is_l)
		l = strlen (argv[op - 1]);
	      else
		{
		  if (!isint (argv[op - 1], &l))
		    integer_expected_error ("before -ne");
		}
	      if (r_is_l)
		r = strlen (argv[op + 2]);
	      else
		{
		  if (!isint (argv[op + 1], &r))
		    integer_expected_error ("after -ne");
		}
	      pos += 3;
	      return (TRUE == (l != r));
	    }
	  break;

	case 'e':
	  if (argv[op][2] == 'q' && !argv[op][3])
	    {
	      /* eq - integer equal */
	      if (l_is_l)
		l = strlen (argv[op - 1]);
	      else
		{
		  if (!isint (argv[op - 1], &l))
		    integer_expected_error ("before -eq");
		}
	      if (r_is_l)
		r = strlen (argv[op + 2]);
	      else
		{
		  if (!isint (argv[op + 1], &r))
		    integer_expected_error ("after -eq");
		}
	      pos += 3;
	      return (TRUE == (l == r));
	    }

	  if (argv[op][2] == 'f' && !argv[op][3])
	    {
	      /* ef - hard link? */
	      pos += 3;
	      if (l_is_l || r_is_l)
		test_syntax_error ("-ef does not accept -l\n", (char *)NULL);
	      if (SAFE_STAT (argv[op - 1], &stat_buf) < 0)
		return (FALSE);
	      if (SAFE_STAT (argv[op + 1], &stat_spare) < 0)
		return (FALSE);
	      return (TRUE ==
		      (stat_buf.st_dev == stat_spare.st_dev &&
		       stat_buf.st_ino == stat_spare.st_ino));
	    }
	  break;

	case 'o':
	  if ('t' == argv[op][2] && '\000' == argv[op][3])
	    {
	      /* ot - older than */
	      pos += 3;
	      if (l_is_l || r_is_l)
		test_syntax_error ("-nt does not accept -l\n", (char *)NULL);
	      if (age_of (argv[op - 1], &l) && age_of (argv[op + 1], &r))
		return (TRUE == (l < r));
	      return (FALSE);
	    }
	  break;
	}
      test_syntax_error ("unknown binary operator", argv[op]);
    }

  if (argv[op][0] == '=' && !argv[op][1])
    {
      value = (strcmp (argv[pos], argv[pos + 2]) == 0);
      pos += 3;
      return (TRUE == value);
    }

  if (strcmp (argv[op], "!=") == 0)
    {
      value = (strcmp (argv[pos], argv[pos + 2]) != 0);
      pos += 3;
      return (TRUE == value);
    }

  /* Not reached.  */
  abort ();
}

static int
unary_operator ()
{
  long r, value;
  struct stat stat_buf;

  switch (argv[pos][1])
    {
    default:
      return (FALSE);

      /* All of the following unary operators use unary_advance (), which
	 checks to make sure that there is an argument, and then advances
	 pos right past it.  This means that pos - 1 is the location of the
	 argument. */

    case 'a':			/* file exists in the file system? */
    case 'e':
      unary_advance ();
      value = -1 != test_stat (argv[pos - 1], &stat_buf);
      return (TRUE == value);

    case 'r':			/* file is readable? */
      unary_advance ();
      value = -1 != eaccess (argv[pos - 1], R_OK);
      return (TRUE == value);

    case 'w':			/* File is writeable? */
      unary_advance ();
      value = -1 != eaccess (argv[pos - 1], W_OK);
      return (TRUE == value);

    case 'x':			/* File is executable? */
      unary_advance ();
      value = -1 != eaccess (argv[pos - 1], X_OK);
      return (TRUE == value);

    case 'O':			/* File is owned by you? */
      unary_advance ();
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      return (TRUE == (geteuid () == stat_buf.st_uid));

    case 'G':			/* File is owned by your group? */
      unary_advance ();
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      return (TRUE == (getegid () == stat_buf.st_gid));

    case 'f':			/* File is a file? */
      unary_advance ();
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      /* Under POSIX, -f is true if the given file exists
	 and is a regular file. */
      return (TRUE == ((S_ISREG (stat_buf.st_mode)) ||
		       (0 == (stat_buf.st_mode & S_IFMT))));

    case 'd':			/* File is a directory? */
      unary_advance ();
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      return (TRUE == (S_ISDIR (stat_buf.st_mode)));

    case 's':			/* File has something in it? */
      unary_advance ();
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      return (TRUE == (stat_buf.st_size > (off_t) 0));

    case 'S':			/* File is a socket? */
#if !defined (S_ISSOCK)
      return (FALSE);
#else
      unary_advance ();

      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      return (TRUE == (S_ISSOCK (stat_buf.st_mode)));
#endif				/* S_ISSOCK */

    case 'c':			/* File is character special? */
      unary_advance ();
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      return (TRUE == (S_ISCHR (stat_buf.st_mode)));

    case 'b':			/* File is block special? */
      unary_advance ();
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      return (TRUE == (S_ISBLK (stat_buf.st_mode)));

    case 'p':			/* File is a named pipe? */
      unary_advance ();
#ifndef S_ISFIFO
      return (FALSE);
#else
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);
      return (TRUE == (S_ISFIFO (stat_buf.st_mode)));
#endif				/* S_ISFIFO */

    case 'L':			/* Same as -h  */
      /*FALLTHROUGH*/

    case 'h':			/* File is a symbolic link? */
      unary_advance ();
#ifndef S_ISLNK
      return (FALSE);
#else
      /* An empty filename is not a valid pathname. */
      if ((argv[pos - 1][0] == '\0') ||
	  (SAFE_LSTAT (argv[pos - 1], &stat_buf) < 0))
	return (FALSE);

      return (TRUE == (S_ISLNK (stat_buf.st_mode)));
#endif				/* S_IFLNK */

    case 'u':			/* File is setuid? */
      unary_advance ();
#ifndef S_ISUID
      return (FALSE);
#else
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      return (TRUE == (0 != (stat_buf.st_mode & S_ISUID)));
#endif

    case 'g':			/* File is setgid? */
      unary_advance ();
#ifndef S_ISGID
      return (FALSE);
#else
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);

      return (TRUE == (0 != (stat_buf.st_mode & S_ISGID)));
#endif

    case 'k':			/* File has sticky bit set? */
      unary_advance ();
      if (test_stat (argv[pos - 1], &stat_buf) < 0)
	return (FALSE);
#ifndef S_ISVTX
      /* This is not Posix, and is not defined on some Posix systems. */
      return (FALSE);
#else
      return (TRUE == (0 != (stat_buf.st_mode & S_ISVTX)));
#endif

    case 't':			/* File (fd) is a terminal?  (fd) defaults to stdout. */
      advance (0);
      if (pos < argc && isint (argv[pos], &r))
	{
	  advance (0);
	  return (TRUE == (isatty ((int) r)));
	}
      return (TRUE == (isatty (1)));

    case 'n':			/* True if arg has some length. */
      unary_advance ();
      return (TRUE == (argv[pos - 1][0] != 0));

    case 'z':			/* True if arg has no length. */
      unary_advance ();
      return (TRUE == (argv[pos - 1][0] == '\0'));
    }
}
	
/*
 * and:
 *	term
 *	term '-a' and
 */
static int
and ()
{
  int value;

  value = term ();
  while ((pos < argc) && strcmp (argv[pos], "-a") == 0)
    {
      advance (0);
      value = TRUTH_AND (value, and ());
    }
  return (TRUE == value);
}

/*
 * or:
 *	and
 *	and '-o' or
 */
static int
or ()
{
  int value;

  value = and ();

  while ((pos < argc) && strcmp (argv[pos], "-o") == 0)
    {
      advance (0);
      value = TRUTH_OR (value, or ());
    }

  return (TRUE == value);
}

/*
 * expr:
 *	or
 */
static int
expr ()
{
  if (pos >= argc)
    beyond ();

  return (FALSE ^ (or ()));		/* Same with this. */
}

/* Return TRUE if S is one of the test command's binary operators. */
static int
binop (s)
     char *s;
{
  return ((STREQ (s,   "=")) || (STREQ (s,  "!=")) || (STREQ (s, "-nt")) ||
	  (STREQ (s, "-ot")) || (STREQ (s, "-ef")) || (STREQ (s, "-eq")) ||
	  (STREQ (s, "-ne")) || (STREQ (s, "-lt")) || (STREQ (s, "-le")) ||
	  (STREQ (s, "-gt")) || (STREQ (s, "-ge")));
}

/* Return non-zero if OP is one of the test command's unary operators. */
static int
unop (op)
     int op;
{
  return (member (op, "abcdefgkLhprsStuwxOGnz"));
}

static int
two_arguments ()
{
  int value;

  if (STREQ (argv[pos], "!"))
    value = strlen (argv[pos+1]) == 0;
  else if ((argv[pos][0] == '-') && (argv[pos][2] == '\0'))
    {
      if (unop (argv[pos][1]))
	value = unary_operator ();
      else
	test_syntax_error ("%s: unary operator expected\n", argv[pos]);
    }
  else
    beyond ();
  return (value);
}

static int
three_arguments ()
{
  int value;

  if (STREQ (argv[pos], "!"))
    {
      advance (1);
      value = !two_arguments ();
    }
  else if (binop (argv[pos+1]))
    {
      value = binary_operator ();
      pos = argc;
    }
  else if ((STREQ (argv[pos+1], "-a")) || (STREQ (argv[pos+1], "-o")) ||
	   (argv[pos][0] == '('))
    value = expr ();
  else
    test_syntax_error ("%s: binary operator expected\n", argv[pos+1]);
  return (value);
}

/* This is an implementation of a Posix.2 proposal by David Korn. */
static int
posixtest ()
{
  int value;

  switch (argc - 1)	/* one extra passed in */
    {
      case 0:
	value = FALSE;
	pos = argc;
	break;

      case 1:
	value = strlen (argv[1]) != 0;
	pos = argc;
	break;

      case 2:
	value = two_arguments ();
	pos = argc;
	break;

      case 3:
	value = three_arguments ();
	break;

      case 4:
	if (STREQ (argv[pos], "!"))
	  {
	    advance (1);
	    value = !three_arguments ();
	    break;
	  }
	/* FALLTHROUGH */
      case 5:
      default:
	value = expr ();
    }

  return (value);
}

#if defined (TEST_STANDALONE)
#include "long-options.h"

static void
usage (status)
     int status;
{
  if (status != 0)
    fprintf (stderr, "Try `%s --help' for more information.\n",
	     program_name);
  else
    {
      printf ("\
Usage: %s EXPRESSION\n\
  or:  [ EXPRESSION ]\n\
  or:  %s OPTION\n\
",
	      program_name, program_name);
      printf ("\
\n\
  --help      display this help and exit\n\
  --version   output version information and exit\n\
\n\
EXPRESSION is true or false and sets exit status.  It is one of:\n\
");
      printf ("\
\n\
  ( EXPRESSION )               EXPRESSION is true\n\
  ! EXPRESSION                 EXPRESSION is false\n\
  EXPRESSION1 -a EXPRESSION2   both EXPRESSION1 and EXPRESSION2 are true\n\
  EXPRESSION1 -o EXPRESSION2   either EXPRESSION1 or EXPRESSION2 is true\n\
\n\
  [-n] STRING          the length of STRING is non-zero\n\
  -z STRING            the length of STRING is zero\n\
  STRING1 = STRING2    the strings are equal\n\
  STRING1 != STRING2   the strings are not equal\n\
\n\
  INTEGER1 -eq INTEGER2   INTEGER1 is equal to INTEGER2\n\
  INTEGER1 -ge INTEGER2   INTEGER1 is greater than or equal to INTEGER2\n\
  INTEGER1 -gt INTEGER2   INTEGER1 is greater than INTEGER2\n\
  INTEGER1 -le INTEGER2   INTEGER1 is less than or equal to INTEGER2\n\
  INTEGER1 -lt INTEGER2   INTEGER1 is less than INTEGER2\n\
  INTEGER1 -ne INTEGER2   INTEGER1 is not equal to INTEGER2\n\
");
      printf ("\
\n\
  FILE1 -ef FILE2   FILE1 and FILE2 have the same device and inode numbers\n\
  FILE1 -nt FILE2   FILE1 is newer (modification date) than FILE2\n\
  FILE1 -ot FILE2   FILE1 is older than FILE2\n\
\n\
  -G FILE     FILE exists and is owned by the effective group ID\n\
  -L FILE     FILE exists and is a symbolic link\n\
  -O FILE     FILE exists and is owned by the effective user ID\n\
  -S FILE     FILE exists and is a socket\n\
  -b FILE     FILE exists and is block special\n\
  -c FILE     FILE exists and is character special\n\
  -d FILE     FILE exists and is a directory\n\
  -e FILE     FILE exists\n\
  -f FILE     FILE exists and is a regular file\n\
  -g FILE     FILE exists and is set-group-ID\n\
  -k FILE     FILE exists and has its sticky bit set\n\
  -p FILE     FILE exists and is a named pipe\n\
  -r FILE     FILE exists and is readable\n\
  -s FILE     FILE exists and has a size greater than zero\n\
  -t          standard output is opened on a terminal\n\
  -t FD       file descriptor FD is opened on a terminal\n\
  -u FILE     FILE exists and its set-user-ID bit is set\n\
  -w FILE     FILE exists and is writable\n\
  -x FILE     FILE exists and is executable\n\
");
      printf ("\
\n\
  --help      display this help and exit\n\
  --version   output version information and exit\n\
\n\
Beware that parentheses need to be escaped by backslashes for shells.\n\
INTEGER may also be -l STRING, which evaluates to the length of STRING.\n\
");
    }
  exit (status);
}
#endif /* TEST_STANDALONE */

/*
 * [:
 *	'[' expr ']'
 * test:
 *	test expr
 */
int
#if defined (TEST_STANDALONE)
main (margc, margv)
#else
test_command (margc, margv)
#endif /* !TEST_STANDALONE */
     int margc;
     char **margv;
{
  int value;

#if !defined (TEST_STANDALONE)
  int code;

  code = setjmp (test_exit_buf);

  if (code)
    return (test_error_return);
#else /* TEST_STANDALONE */
  program_name = margv[0];
#endif /* TEST_STANDALONE */

  argv = margv;

  if (margv[0] && strcmp (margv[0], "[") == 0)
    {
      parse_long_options (argc, argv, COMMAND_NAME, version_string, usage);

      --margc;

      if (margc < 2)
	test_exit (SHELL_BOOLEAN (FALSE));

      if (margv[margc] && strcmp (margv[margc], "]") != 0)
	test_syntax_error ("missing `]'\n", (char *)NULL);
    }

  argc = margc;
  pos = 1;

  if (pos >= argc)
    test_exit (SHELL_BOOLEAN (FALSE));

  parse_long_options (argc, argv, COMMAND_NAME, version_string, usage);
  value = posixtest ();

  if (pos != argc)
    test_syntax_error ("too many arguments\n", (char *)NULL);

  test_exit (SHELL_BOOLEAN (value));
}