shell.c

android-w.song.android.widget

      exit (EXECUTION_SUCCESS);
    }

  /* All done with full word options; do standard shell option parsing.*/
  this_command_name = shell_name;	/* for error reporting */
  arg_index = parse_shell_options (argv, arg_index, argc);

  /* If user supplied the "--login" (or -l) flag, then set and invert
     LOGIN_SHELL. */
  if (make_login_shell)
    {
      login_shell++;
      login_shell = -login_shell;
    }

  set_login_shell ("login_shell", login_shell != 0);

  if (dump_po_strings)
    dump_translatable_strings = 1;

  if (dump_translatable_strings)
    read_but_dont_execute = 1;

  if (running_setuid && privileged_mode == 0)
    disable_priv_mode ();

  /* Need to get the argument to a -c option processed in the
     above loop.  The next arg is a command to execute, and the
     following args are $0...$n respectively. */
  if (want_pending_command)
    {
      command_execution_string = argv[arg_index];
      if (command_execution_string == 0)
	{
	  report_error (_("%s: option requires an argument"), "-c");
	  exit (EX_BADUSAGE);
	}
      arg_index++;
    }
  this_command_name = (char *)NULL;

  cmd_init();		/* initialize the command object caches */

  /* First, let the outside world know about our interactive status.
     A shell is interactive if the `-i' flag was given, or if all of
     the following conditions are met:
	no -c command
	no arguments remaining or the -s flag given
	standard input is a terminal
	standard error is a terminal
     Refer to Posix.2, the description of the `sh' utility. */

  if (forced_interactive ||		/* -i flag */
      (!command_execution_string &&	/* No -c command and ... */
       wordexp_only == 0 &&		/* No --wordexp and ... */
       ((arg_index == argc) ||		/*   no remaining args or... */
	read_from_stdin) &&		/*   -s flag with args, and */
       isatty (fileno (stdin)) &&	/* Input is a terminal and */
       isatty (fileno (stderr))))	/* error output is a terminal. */
    init_interactive ();
  else
    init_noninteractive ();

  /*
   * Some systems have the bad habit of starting login shells with lots of open
   * file descriptors.  For instance, most systems that have picked up the
   * pre-4.0 Sun YP code leave a file descriptor open each time you call one
   * of the getpw* functions, and it's set to be open across execs.  That
   * means one for login, one for xterm, one for shelltool, etc.  There are
   * also systems that open persistent FDs to other agents or files as part
   * of process startup; these need to be set to be close-on-exec.
   */
  if (login_shell && interactive_shell)
    {
      for (i = 3; i < 20; i++)
	SET_CLOSE_ON_EXEC (i);
    }

  /* If we're in a strict Posix.2 mode, turn on interactive comments,
     alias expansion in non-interactive shells, and other Posix.2 things. */
  if (posixly_correct)
    {
      bind_variable ("POSIXLY_CORRECT", "y", 0);
      sv_strict_posix ("POSIXLY_CORRECT");
    }

  /* Now we run the shopt_alist and process the options. */
  if (shopt_alist)
    run_shopt_alist ();

  /* From here on in, the shell must be a normal functioning shell.
     Variables from the environment are expected to be set, etc. */
  shell_initialize ();

  set_default_lang ();
  set_default_locale_vars ();

  /*
   * M-x term -> TERM=eterm EMACS=22.1 (term:0.96)	(eterm)
   * M-x shell -> TERM=dumb EMACS=t			(no line editing)
   * M-x terminal -> TERM=emacs-em7955 EMACS=		(line editing)
   */
  if (interactive_shell)
    {
      char *term, *emacs;

      term = get_string_value ("TERM");
      emacs = get_string_value ("EMACS");

      /* Not sure any emacs terminal emulator sets TERM=emacs any more */
      no_line_editing |= term && (STREQ (term, "emacs"));
      no_line_editing |= emacs && emacs[0] == 't' && emacs[1] == '\0' && STREQ (term, "dumb");

      /* running_under_emacs == 2 for `eterm' */
      running_under_emacs = (emacs != 0) || (term && STREQN (term, "emacs", 5));
      running_under_emacs += term && STREQN (term, "eterm", 5) && emacs && strstr (emacs, "term");

      if (running_under_emacs)
	gnu_error_format = 1;
    }

  top_level_arg_index = arg_index;
  old_errexit_flag = exit_immediately_on_error;

  /* Give this shell a place to longjmp to before executing the
     startup files.  This allows users to press C-c to abort the
     lengthy startup. */
  code = setjmp (top_level);
  if (code)
    {
      if (code == EXITPROG || code == ERREXIT)
	exit_shell (last_command_exit_value);
      else
	{
#if defined (JOB_CONTROL)
	  /* Reset job control, since run_startup_files turned it off. */
	  set_job_control (interactive_shell);
#endif
	  /* Reset value of `set -e', since it's turned off before running
	     the startup files. */
	  exit_immediately_on_error += old_errexit_flag;
	  locally_skip_execution++;
	}
    }

  arg_index = top_level_arg_index;

  /* Execute the start-up scripts. */

  if (interactive_shell == 0)
    {
      unbind_variable ("PS1");
      unbind_variable ("PS2");
      interactive = 0;
#if 0
      /* This has already been done by init_noninteractive */
      expand_aliases = posixly_correct;
#endif
    }
  else
    {
      change_flag ('i', FLAG_ON);
      interactive = 1;
    }

#if defined (RESTRICTED_SHELL)
  /* Set restricted_shell based on whether the basename of $0 indicates that
     the shell should be restricted or if the `-r' option was supplied at
     startup. */
  restricted_shell = shell_is_restricted (shell_name);

  /* If the `-r' option is supplied at invocation, make sure that the shell
     is not in restricted mode when running the startup files. */
  saverst = restricted;
  restricted = 0;
#endif

  /* The startup files are run with `set -e' temporarily disabled. */
  if (locally_skip_execution == 0 && running_setuid == 0)
    {
      old_errexit_flag = exit_immediately_on_error;
      exit_immediately_on_error = 0;

      run_startup_files ();
      exit_immediately_on_error += old_errexit_flag;
    }

  /* If we are invoked as `sh', turn on Posix mode. */
  if (act_like_sh)
    {
      bind_variable ("POSIXLY_CORRECT", "y", 0);
      sv_strict_posix ("POSIXLY_CORRECT");
    }

#if defined (RESTRICTED_SHELL)
  /* Turn on the restrictions after executing the startup files.  This
     means that `bash -r' or `set -r' invoked from a startup file will
     turn on the restrictions after the startup files are executed. */
  restricted = saverst || restricted;
  if (shell_reinitialized == 0)
    maybe_make_restricted (shell_name);
#endif /* RESTRICTED_SHELL */

#if defined (WORDEXP_OPTION)
  if (wordexp_only)
    {
      startup_state = 3;
      last_command_exit_value = run_wordexp (argv[arg_index]);
      exit_shell (last_command_exit_value);
    }
#endif

  if (command_execution_string)
    {
      arg_index = bind_args (argv, arg_index, argc, 0);
      startup_state = 2;

      if (debugging_mode)
	start_debugger ();

#if defined (ONESHOT)
      executing = 1;
      run_one_command (command_execution_string);
      exit_shell (last_command_exit_value);
#else /* ONESHOT */
      with_input_from_string (command_execution_string, "-c");
      goto read_and_execute;
#endif /* !ONESHOT */
    }

  /* Get possible input filename and set up default_buffered_input or
     default_input as appropriate. */
  if (arg_index != argc && read_from_stdin == 0)
    {
      open_shell_script (argv[arg_index]);
      arg_index++;
    }
  else if (interactive == 0)
    /* In this mode, bash is reading a script from stdin, which is a
       pipe or redirected file. */
#if defined (BUFFERED_INPUT)
    default_buffered_input = fileno (stdin);	/* == 0 */
#else
    setbuf (default_input, (char *)NULL);
#endif /* !BUFFERED_INPUT */

  set_bash_input ();

  /* Bind remaining args to $1 ... $n */
  arg_index = bind_args (argv, arg_index, argc, 1);

  if (debugging_mode && locally_skip_execution == 0 && running_setuid == 0)
    start_debugger ();

  /* Do the things that should be done only for interactive shells. */
  if (interactive_shell)
    {
      /* Set up for checking for presence of mail. */
      reset_mail_timer ();
      init_mail_dates ();

#if defined (HISTORY)
      /* Initialize the interactive history stuff. */
      bash_initialize_history ();
      /* Don't load the history from the history file if we've already
	 saved some lines in this session (e.g., by putting `history -s xx'
	 into one of the startup files). */
      if (shell_initialized == 0 && history_lines_this_session == 0)
	load_history ();
#endif /* HISTORY */

      /* Initialize terminal state for interactive shells after the
	 .bash_profile and .bashrc are interpreted. */
      get_tty_state ();
    }

#if !defined (ONESHOT)
 read_and_execute:
#endif /* !ONESHOT */

  shell_initialized = 1;

  /* Read commands until exit condition. */
  reader_loop ();
  exit_shell (last_command_exit_value);
}

static int
parse_long_options (argv, arg_start, arg_end)
     char **argv;
     int arg_start, arg_end;
{
  int arg_index, longarg, i;
  char *arg_string;

  arg_index = arg_start;
  while ((arg_index != arg_end) && (arg_string = argv[arg_index]) &&
	 (*arg_string == '-'))
    {
      longarg = 0;

      /* Make --login equivalent to -login. */
      if (arg_string[1] == '-' && arg_string[2])
	{
	  longarg = 1;
	  arg_string++;
	}

      for (i = 0; long_args[i].name; i++)
	{
	  if (STREQ (arg_string + 1, long_args[i].name))
	    {
	      if (long_args[i].type == Int)
		*long_args[i].int_value = 1;
	      else if (argv[++arg_index] == 0)
		{
		  report_error (_("%s: option requires an argument"), long_args[i].name);
		  exit (EX_BADUSAGE);
		}
	      else
		*long_args[i].char_value = argv[arg_index];

	      break;
	    }
	}
      if (long_args[i].name == 0)
	{
	  if (longarg)
	    {
	      report_error (_("%s: invalid option"), argv[arg_index]);
	      show_shell_usage (stderr, 0);
	      exit (EX_BADUSAGE);
	    }
	  break;		/* No such argument.  Maybe flag arg. */
	}

      arg_index++;
    }

  return (arg_index);
}

static int
parse_shell_options (argv, arg_start, arg_end)
     char **argv;
     int arg_start, arg_end;
{
  int arg_index;
  int arg_character, on_or_off, next_arg, i;
  char *o_option, *arg_string;

  arg_index = arg_start;
  while (arg_index != arg_end && (arg_string = argv[arg_index]) &&
	 (*arg_string == '-' || *arg_string == '+'))
    {
      /* There are flag arguments, so parse them. */
      next_arg = arg_index + 1;

      /* A single `-' signals the end of options.  From the 4.3 BSD sh.
	 An option `--' means the same thing; this is the standard
	 getopt(3) meaning. */
      if (arg_string[0] == '-' &&
	   (arg_string[1] == '\0' ||
	     (arg_string[1] == '-' && arg_string[2] == '\0')))
	return (next_arg);

      i = 1;
      on_or_off = arg_string[0];
      while (arg_character = arg_string[i++])
	{
	  switch (arg_character)
	    {
	    case 'c':
	      want_pending_command = 1;
	      break;

	    case 'l':
	      make_login_shell = 1;
	      break;

	    case 's':
	      read_from_stdin = 1;
	      break;

	    case 'o':
	      o_option = argv[next_arg];
	      if (o_option == 0)
		{
		  list_minus_o_opts (-1, (on_or_off == '-') ? 0 : 1);
		  break;
		}
	      if (set_minus_o_option (on_or_off, o_option) != EXECUTION_SUCCESS)
		exit (EX_BADUSAGE);
	      next_arg++;
	      break;

	    case 'O':
	      /* Since some of these can be overridden by the normal
		 interactive/non-interactive shell initialization or
		 initializing posix mode, we save the options and process
		 them after initialization. */
	      o_option = argv[next_arg];
	      if (o_option == 0)
		{
		  shopt_listopt (o_option, (on_or_off == '-') ? 0 : 1);
		  break;
		}
	      add_shopt_to_alist (o_option, on_or_off);
	      next_arg++;
	      break;

	    case 'D':
	      dump_translatable_strings = 1;
	      break;

	    default:
	      if (change_flag (arg_character, on_or_off) == FLAG_ERROR)
		{
		  report_error (_("%c%c: invalid option"), on_or_off, arg_character);
		  show_shell_usage (stderr, 0);
		  exit (EX_BADUSAGE);
		}
	    }
	}
      /* Can't do just a simple increment anymore -- what about
	 "bash -abouo emacs ignoreeof -hP"? */
      arg_index = next_arg;
    }

  return (arg_index);
}

/* Exit the shell with status S. */
void
exit_shell (s)
     int s;
{
  fflush (stdout);		/* XXX */
  fflush (stderr);

  /* Do trap[0] if defined.  Allow it to override the exit status
     passed to us. */
  if (signal_is_trapped (0))
    s = run_exit_trap ();

#if defined (PROCESS_SUBSTITUTION)
  unlink_fifo_list ();
#endif /* PROCESS_SUBSTITUTION */

#if defined (HISTORY)
  if (interactive_shell)
    maybe_save_shell_history ();
#endif /* HISTORY */

#if defined (COPROCESS_SUPPORT)
  coproc_flush ();
#endif

#if defined (JOB_CONTROL)
  /* If the user has run `shopt -s huponexit', hangup all jobs when we exit
     an interactive login shell.  ksh does this unconditionally. */
  if (interactive_shell && login_shell && hup_on_exit)
    hangup_all_jobs ();

  /* If this shell is interactive, terminate all stopped jobs and