test.c

android-w.song.android.widget

}


static int
binary_operator ()
{
  int value;
  char *w;

  w = argv[pos + 1];
  if ((w[0] == '=' && (w[1] == '\0' || (w[1] == '=' && w[2] == '\0'))) || /* =, == */
      ((w[0] == '>' || w[0] == '<') && w[1] == '\0') ||		/* <, > */
      (w[0] == '!' && w[1] == '=' && w[2] == '\0'))		/* != */
    {
      value = binary_test (w, argv[pos], argv[pos + 2], 0);
      pos += 3;
      return (value);
    }

#if defined (PATTERN_MATCHING)
  if ((w[0] == '=' || w[0] == '!') && w[1] == '~' && w[2] == '\0')
    {
      value = patcomp (argv[pos], argv[pos + 2], w[0] == '=' ? EQ : NE);
      pos += 3;
      return (value);
    }
#endif

  if ((w[0] != '-' || w[3] != '\0') || test_binop (w) == 0)
    {
      test_syntax_error (_("%s: binary operator expected"), w);
      /* NOTREACHED */
      return (FALSE);
    }

  value = binary_test (w, argv[pos], argv[pos + 2], 0);
  pos += 3;
  return value;
}

static int
unary_operator ()
{
  char *op;
  intmax_t r;

  op = argv[pos];
  if (test_unop (op) == 0)
    return (FALSE);

  /* the only tricky case is `-t', which may or may not take an argument. */
  if (op[1] == 't')
    {
      advance (0);
      if (pos < argc)
	{
	  if (legal_number (argv[pos], &r))
	    {
	      advance (0);
	      return (unary_test (op, argv[pos - 1]));
	    }
	  else
	    return (FALSE);
	}
      else
	return (unary_test (op, "1"));
    }

  /* All of the unary operators take an argument, so we first call
     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. */
  unary_advance ();
  return (unary_test (op, argv[pos - 1]));
}

int
unary_test (op, arg)
     char *op, *arg;
{
  intmax_t r;
  struct stat stat_buf;
  SHELL_VAR *v;
     
  switch (op[1])
    {
    case 'a':			/* file exists in the file system? */
    case 'e':
      return (sh_stat (arg, &stat_buf) == 0);

    case 'r':			/* file is readable? */
      return (sh_eaccess (arg, R_OK) == 0);

    case 'w':			/* File is writeable? */
      return (sh_eaccess (arg, W_OK) == 0);

    case 'x':			/* File is executable? */
      return (sh_eaccess (arg, X_OK) == 0);

    case 'O':			/* File is owned by you? */
      return (sh_stat (arg, &stat_buf) == 0 &&
	      (uid_t) current_user.euid == (uid_t) stat_buf.st_uid);

    case 'G':			/* File is owned by your group? */
      return (sh_stat (arg, &stat_buf) == 0 &&
	      (gid_t) current_user.egid == (gid_t) stat_buf.st_gid);

    case 'N':
      return (sh_stat (arg, &stat_buf) == 0 &&
	      stat_buf.st_atime <= stat_buf.st_mtime);

    case 'f':			/* File is a file? */
      if (sh_stat (arg, &stat_buf) < 0)
	return (FALSE);

      /* -f is true if the given file exists and is a regular file. */
#if defined (S_IFMT)
      return (S_ISREG (stat_buf.st_mode) || (stat_buf.st_mode & S_IFMT) == 0);
#else
      return (S_ISREG (stat_buf.st_mode));
#endif /* !S_IFMT */

    case 'd':			/* File is a directory? */
      return (sh_stat (arg, &stat_buf) == 0 && (S_ISDIR (stat_buf.st_mode)));

    case 's':			/* File has something in it? */
      return (sh_stat (arg, &stat_buf) == 0 && stat_buf.st_size > (off_t) 0);

    case 'S':			/* File is a socket? */
#if !defined (S_ISSOCK)
      return (FALSE);
#else
      return (sh_stat (arg, &stat_buf) == 0 && S_ISSOCK (stat_buf.st_mode));
#endif /* S_ISSOCK */

    case 'c':			/* File is character special? */
      return (sh_stat (arg, &stat_buf) == 0 && S_ISCHR (stat_buf.st_mode));

    case 'b':			/* File is block special? */
      return (sh_stat (arg, &stat_buf) == 0 && S_ISBLK (stat_buf.st_mode));

    case 'p':			/* File is a named pipe? */
#ifndef S_ISFIFO
      return (FALSE);
#else
      return (sh_stat (arg, &stat_buf) == 0 && S_ISFIFO (stat_buf.st_mode));
#endif /* S_ISFIFO */

    case 'L':			/* Same as -h  */
    case 'h':			/* File is a symbolic link? */
#if !defined (S_ISLNK) || !defined (HAVE_LSTAT)
      return (FALSE);
#else
      return ((arg[0] != '\0') &&
	      (lstat (arg, &stat_buf) == 0) && S_ISLNK (stat_buf.st_mode));
#endif /* S_IFLNK && HAVE_LSTAT */

    case 'u':			/* File is setuid? */
      return (sh_stat (arg, &stat_buf) == 0 && (stat_buf.st_mode & S_ISUID) != 0);

    case 'g':			/* File is setgid? */
      return (sh_stat (arg, &stat_buf) == 0 && (stat_buf.st_mode & S_ISGID) != 0);

    case 'k':			/* File has sticky bit set? */
#if !defined (S_ISVTX)
      /* This is not Posix, and is not defined on some Posix systems. */
      return (FALSE);
#else
      return (sh_stat (arg, &stat_buf) == 0 && (stat_buf.st_mode & S_ISVTX) != 0);
#endif

    case 't':	/* File fd is a terminal? */
      if (legal_number (arg, &r) == 0)
	return (FALSE);
      return ((r == (int)r) && isatty ((int)r));

    case 'n':			/* True if arg has some length. */
      return (arg[0] != '\0');

    case 'z':			/* True if arg has no length. */
      return (arg[0] == '\0');

    case 'o':			/* True if option `arg' is set. */
      return (minus_o_option_value (arg) == 1);

    case 'v':
      v = find_variable (arg);
      return (v && var_isset (v) ? TRUE : FALSE);
    }

  /* We can't actually get here, but this shuts up gcc. */
  return (FALSE);
}

/* Return TRUE if OP is one of the test command's binary operators. */
int
test_binop (op)
     char *op;
{
  if (op[0] == '=' && op[1] == '\0')
    return (1);		/* '=' */
  else if ((op[0] == '<' || op[0] == '>') && op[1] == '\0')  /* string <, > */
    return (1);
  else if ((op[0] == '=' || op[0] == '!') && op[1] == '=' && op[2] == '\0')
    return (1);		/* `==' and `!=' */
#if defined (PATTERN_MATCHING)
  else if (op[2] == '\0' && op[1] == '~' && (op[0] == '=' || op[0] == '!'))
    return (1);
#endif
  else if (op[0] != '-' || op[2] == '\0' || op[3] != '\0')
    return (0);
  else
    {
      if (op[2] == 't')
	switch (op[1])
	  {
	  case 'n':		/* -nt */
	  case 'o':		/* -ot */
	  case 'l':		/* -lt */
	  case 'g':		/* -gt */
	    return (1);
	  default:
	    return (0);
	  }
      else if (op[1] == 'e')
	switch (op[2])
	  {
	  case 'q':		/* -eq */
	  case 'f':		/* -ef */
	    return (1);
	  default:
	    return (0);
	  }
      else if (op[2] == 'e')
	switch (op[1])
	  {
	  case 'n':		/* -ne */
	  case 'g':		/* -ge */
	  case 'l':		/* -le */
	    return (1);
	  default:
	    return (0);
	  }
      else
	return (0);
    }
}

/* Return non-zero if OP is one of the test command's unary operators. */
int
test_unop (op)
     char *op;
{
  if (op[0] != '-' || op[2] != 0)
    return (0);

  switch (op[1])
    {
    case 'a': case 'b': case 'c': case 'd': case 'e':
    case 'f': case 'g': case 'h': case 'k': case 'n':
    case 'o': case 'p': case 'r': case 's': case 't':
    case 'u': case 'v': case 'w': case 'x': case 'z':
    case 'G': case 'L': case 'O': case 'S': case 'N':
      return (1);
    }

  return (0);
}

static int
two_arguments ()
{
  if (argv[pos][0] == '!' && argv[pos][1] == '\0')
    return (argv[pos + 1][0] == '\0');
  else if (argv[pos][0] == '-' && argv[pos][2] == '\0')
    {
      if (test_unop (argv[pos]))
	return (unary_operator ());
      else
	test_syntax_error (_("%s: unary operator expected"), argv[pos]);
    }
  else
    test_syntax_error (_("%s: unary operator expected"), argv[pos]);

  return (0);
}

#define ANDOR(s)  (s[0] == '-' && !s[2] && (s[1] == 'a' || s[1] == 'o'))

/* This could be augmented to handle `-t' as equivalent to `-t 1', but
   POSIX requires that `-t' be given an argument. */
#define ONE_ARG_TEST(s)		((s)[0] != '\0')

static int
three_arguments ()
{
  int value;

  if (test_binop (argv[pos+1]))
    {
      value = binary_operator ();
      pos = argc;
    }
  else if (ANDOR (argv[pos+1]))
    {
      if (argv[pos+1][1] == 'a')
	value = ONE_ARG_TEST(argv[pos]) && ONE_ARG_TEST(argv[pos+2]);
      else
	value = ONE_ARG_TEST(argv[pos]) || ONE_ARG_TEST(argv[pos+2]);
      pos = argc;
    }
  else if (argv[pos][0] == '!' && argv[pos][1] == '\0')
    {
      advance (1);
      value = !two_arguments ();
    }
  else if (argv[pos][0] == '(' && argv[pos+2][0] == ')')
    {
      value = ONE_ARG_TEST(argv[pos+1]);
      pos = argc;
    }
  else
    test_syntax_error (_("%s: binary operator expected"), 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 = ONE_ARG_TEST(argv[1]);
	pos = argc;
	break;

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

      case 3:
	value = three_arguments ();
	break;

      case 4:
	if (argv[pos][0] == '!' && argv[pos][1] == '\0')
	  {
	    advance (1);
	    value = !three_arguments ();
	    break;
	  }
	/* FALLTHROUGH */
      default:
	value = expr ();
    }

  return (value);
}

/*
 * [:
 *	'[' expr ']'
 * test:
 *	test expr
 */
int
test_command (margc, margv)
     int margc;
     char **margv;
{
  int value;
  int code;

  USE_VAR(margc);

  code = setjmp (test_exit_buf);

  if (code)
    return (test_error_return);

  argv = margv;

  if (margv[0] && margv[0][0] == '[' && margv[0][1] == '\0')
    {
      --margc;

      if (margv[margc] && (margv[margc][0] != ']' || margv[margc][1]))
	test_syntax_error (_("missing `]'"), (char *)NULL);

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

  argc = margc;
  pos = 1;

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

  noeval = 0;
  value = posixtest ();

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

  test_exit (SHELL_BOOLEAN (value));
}