Initial revision

1 files changed, 1054 insertions, 0 deletions

diff --git a/src/test.c b/src/test.c
new file mode 100644
index 000000000..a78af0968
--- /dev/null
+++ b/src/test.c
@@ -0,0 +1,1054 @@
+/* GNU test program (ksb and mjb) */
+
+/* Modified to run with the GNU shell by bfox. */
+
+/* Copyright (C) 1987, 1988, 1989, 1990, 1991 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 <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"
+#  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 */
+#  if defined (NGROUPS_MAX) || defined (_SC_NGROUPS_MAX) || defined (NGROUPS)
+#    define HAVE_GETGROUPS
+#  endif /* NGROUPS_MAX || _SC_NGROUPS_MAX || NGROUPS */
+#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>
+#if !defined (errno)
+extern int errno;
+#endif /* !errno */
+
+#if !defined (STREQ)
+#  define STREQ(a, b) ((a)[0] == (b)[0] && strcmp (a, b) == 0)
+#endif /* !STREQ */
+
+#if !defined (member)
+#  define member(c, s) (int)((c) ? index ((s), (c)) : 0)
+#endif /* !member */
+
+#if defined (_POSIX_VERSION)
+
+/* Even though SunOS 4, Ultrix 4, and 386BSD are mostly POSIX.1 compliant,
+   their getgroups system call (except in the `System V' environment, which
+   is troublesome in other ways) fills in an array of int, not gid_t
+   (which is `short' on those systems).  Kludge, kludge.  */
+
+#if !defined(sun) && !defined(ultrix) && !defined(__386BSD__)
+#define GETGROUPS_T gid_t
+#else
+#define GETGROUPS_T int
+#endif
+#else /* !_POSIX_VERSION */
+#define GETGROUPS_T int
+#endif /* !_POSIX_VERSION */
+
+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 */
+
+/* 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 ();
+
+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 (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;
+{
+  extern int group_member ();
+  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);
+}
+
+#if defined (HAVE_GETGROUPS)
+/* The number of groups that this user is a member of. */
+static int ngroups = 0;
+static GETGROUPS_T *group_array = (GETGROUPS_T *)NULL;
+static int default_group_array_size = 0;
+#endif /* HAVE_GETGROUPS */
+
+/* Return non-zero if GID is one that we have in our groups list. */
+int
+group_member (gid)
+     gid_t gid;
+{
+#if !defined (HAVE_GETGROUPS)
+  return ((gid == getgid ()) || (gid == getegid ()));
+#else
+  register int i;
+
+  /* getgroups () returns the number of elements that it was able to
+     place into the array.  We simply continue to call getgroups ()
+     until the number of elements placed into the array is smaller than
+     the physical size of the array. */
+
+  while (ngroups == default_group_array_size)
+    {
+      default_group_array_size += 64;
+
+      group_array = (GETGROUPS_T *)
+	xrealloc (group_array,
+		  default_group_array_size * sizeof (GETGROUPS_T));
+
+      ngroups = getgroups (default_group_array_size, group_array);
+    }
+
+  /* In case of error, the user loses. */
+  if (ngroups < 0)
+    return (0);
+
+  /* Search through the list looking for GID. */
+  for (i = 0; i < ngroups; i++)
+    if (gid == group_array[i])
+      return (1);
+
+  return (0);
+#endif /* HAVE_GETGROUPS */
+}
+
+/* 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. */
+#if !defined (lint)
+#define advance(f)	(++pos, f && (pos < argc ? 0 : beyond()))
+#endif
+
+#if !defined (advance)
+static int
+advance (f)
+     int f;
+{
+  ++pos;
+
+  if (f && pos >= argc)
+    beyond ();
+}
+#endif /* advance */
+
+#define unary_advance() (advance (1),++pos)
+
+/*
+ * beyond - call when we're beyond the end of the argument list (an
+ *	error condition)
+ */
+static int
+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 (stat (argv[op - 1], &stat_buf) < 0)
+		return (FALSE);
+	      if (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);
+    }
+}
+
+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') ||
+	  (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 ();
+      if (test_stat (argv[pos - 1], &stat_buf) < 0)
+	return (FALSE);
+
+      return (TRUE == (0 != (stat_buf.st_mode & S_ISUID)));
+
+    case 'g':			/* File is setgid? */
+      unary_advance ();
+      if (test_stat (argv[pos - 1], &stat_buf) < 0)
+	return (FALSE);
+
+      return (TRUE == (0 != (stat_buf.st_mode & S_ISGID)));
+
+    case 'k':			/* File has sticky bit set? */
+      unary_advance ();
+      if (test_stat (argv[pos - 1], &stat_buf) < 0)
+	return (FALSE);
+#if !defined (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);
+}
+
+/*
+ * [:
+ *	'[' expr ']'
+ * test:
+ *	test expr
+ */
+int
+#if defined (TEST_STANDALONE)
+main (margc, margv)
+#else
+test_command (margc, margv)
+#endif /* !TEST_STANDALONE */
+     int margc;
+     char **margv;
+{
+  auto int value;
+  int expr ();
+
+#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)
+    {
+      --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));
+
+  value = posixtest ();
+
+  if (pos != argc)
+    test_syntax_error ("too many arguments\n", (char *)NULL);
+
+  test_exit (SHELL_BOOLEAN (value));
+}