initial import from bash_3.1dfsg.orig.tar.gz

1 files changed, 1793 insertions, 0 deletions

diff --git a/shell.c b/shell.c
new file mode 100644
index 0000000..6d07c78
--- /dev/null
+++ b/shell.c
@@ -0,0 +1,1793 @@
+/* shell.c -- GNU's idea of the POSIX shell specification. */
+
+/* Copyright (C) 1987-2005 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
+
+  Birthdate:
+  Sunday, January 10th, 1988.
+  Initial author: Brian Fox
+*/
+#define INSTALL_DEBUG_MODE
+
+#include "config.h"
+
+#include "bashtypes.h"
+#if !defined (_MINIX) && defined (HAVE_SYS_FILE_H)
+#  include <sys/file.h>
+#endif
+#include "posixstat.h"
+#include "posixtime.h"
+#include "bashansi.h"
+#include <stdio.h>
+#include <signal.h>
+#include <errno.h>
+#include "filecntl.h"
+#include <pwd.h>
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include "bashintl.h"
+
+#define NEED_SH_SETLINEBUF_DECL		/* used in externs.h */
+
+#include "shell.h"
+#include "flags.h"
+#include "trap.h"
+#include "mailcheck.h"
+#include "builtins.h"
+#include "builtins/common.h"
+
+#if defined (JOB_CONTROL)
+#include "jobs.h"
+#endif /* JOB_CONTROL */
+
+#include "input.h"
+#include "execute_cmd.h"
+#include "findcmd.h"
+
+#if defined (USING_BASH_MALLOC) && defined (DEBUG) && !defined (DISABLE_MALLOC_WRAPPERS)
+#  include <malloc/shmalloc.h>
+#endif
+
+#if defined (HISTORY)
+#  include "bashhist.h"
+#  include <readline/history.h>
+#endif
+
+#include <tilde/tilde.h>
+#include <glob/strmatch.h>
+
+#if defined (__OPENNT)
+#  include <opennt/opennt.h>
+#endif
+
+#if !defined (HAVE_GETPW_DECLS)
+extern struct passwd *getpwuid ();
+#endif /* !HAVE_GETPW_DECLS */
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+#if defined (NO_MAIN_ENV_ARG)
+extern char **environ;	/* used if no third argument to main() */
+#endif
+
+extern char *dist_version, *release_status;
+extern int patch_level, build_version;
+extern int shell_level;
+extern int subshell_environment;
+extern int last_command_exit_value;
+extern int line_number;
+extern int expand_aliases;
+extern int array_needs_making;
+extern int gnu_error_format;
+extern char *primary_prompt, *secondary_prompt;
+extern char *this_command_name;
+
+/* Non-zero means that this shell has already been run; i.e. you should
+   call shell_reinitialize () if you need to start afresh. */
+int shell_initialized = 0;
+
+COMMAND *global_command = (COMMAND *)NULL;
+
+/* Information about the current user. */
+struct user_info current_user =
+{
+  (uid_t)-1, (uid_t)-1, (gid_t)-1, (gid_t)-1,
+  (char *)NULL, (char *)NULL, (char *)NULL
+};
+
+/* The current host's name. */
+char *current_host_name = (char *)NULL;
+
+/* Non-zero means that this shell is a login shell.
+   Specifically:
+   0 = not login shell.
+   1 = login shell from getty (or equivalent fake out)
+  -1 = login shell from "--login" (or -l) flag.
+  -2 = both from getty, and from flag.
+ */
+int login_shell = 0;
+
+/* Non-zero means that at this moment, the shell is interactive.  In
+   general, this means that the shell is at this moment reading input
+   from the keyboard. */
+int interactive = 0;
+
+/* Non-zero means that the shell was started as an interactive shell. */
+int interactive_shell = 0;
+
+/* Non-zero means to send a SIGHUP to all jobs when an interactive login
+   shell exits. */
+int hup_on_exit = 0;
+
+/* Tells what state the shell was in when it started:
+	0 = non-interactive shell script
+	1 = interactive
+	2 = -c command
+	3 = wordexp evaluation
+   This is a superset of the information provided by interactive_shell.
+*/
+int startup_state = 0;
+
+/* Special debugging helper. */
+int debugging_login_shell = 0;
+
+/* The environment that the shell passes to other commands. */
+char **shell_environment;
+
+/* Non-zero when we are executing a top-level command. */
+int executing = 0;
+
+/* The number of commands executed so far. */
+int current_command_number = 1;
+
+/* Non-zero is the recursion depth for commands. */
+int indirection_level = 0;
+
+/* The name of this shell, as taken from argv[0]. */
+char *shell_name = (char *)NULL;
+
+/* time in seconds when the shell was started */
+time_t shell_start_time;
+
+/* Are we running in an emacs shell window? */
+int running_under_emacs;
+
+/* The name of the .(shell)rc file. */
+static char *bashrc_file = "~/.bashrc";
+
+/* Non-zero means to act more like the Bourne shell on startup. */
+static int act_like_sh;
+
+/* Non-zero if this shell is being run by `su'. */
+static int su_shell;
+
+/* Non-zero if we have already expanded and sourced $ENV. */
+static int sourced_env;
+
+/* Is this shell running setuid? */
+static int running_setuid;
+
+/* Values for the long-winded argument names. */
+static int debugging;			/* Do debugging things. */
+static int no_rc;			/* Don't execute ~/.bashrc */
+static int no_profile;			/* Don't execute .profile */
+static int do_version;			/* Display interesting version info. */
+static int make_login_shell;		/* Make this shell be a `-bash' shell. */
+static int want_initial_help;		/* --help option */
+
+int debugging_mode = 0;		/* In debugging mode with --debugger */
+int no_line_editing = 0;	/* Don't do fancy line editing. */
+int dump_translatable_strings;	/* Dump strings in $"...", don't execute. */
+int dump_po_strings;		/* Dump strings in $"..." in po format */
+int wordexp_only = 0;		/* Do word expansion only */
+int protected_mode = 0;		/* No command substitution with --wordexp */
+
+#if defined (STRICT_POSIX)
+int posixly_correct = 1;	/* Non-zero means posix.2 superset. */
+#else
+int posixly_correct = 0;	/* Non-zero means posix.2 superset. */
+#endif
+
+
+/* Some long-winded argument names.  These are obviously new. */
+#define Int 1
+#define Charp 2
+struct {
+  char *name;
+  int type;
+  int *int_value;
+  char **char_value;
+} long_args[] = {
+  { "debug", Int, &debugging, (char **)0x0 },
+#if defined (DEBUGGER)
+  { "debugger", Int, &debugging_mode, (char **)0x0 },
+#endif
+  { "dump-po-strings", Int, &dump_po_strings, (char **)0x0 },
+  { "dump-strings", Int, &dump_translatable_strings, (char **)0x0 },
+  { "help", Int, &want_initial_help, (char **)0x0 },
+  { "init-file", Charp, (int *)0x0, &bashrc_file },
+  { "login", Int, &make_login_shell, (char **)0x0 },
+  { "noediting", Int, &no_line_editing, (char **)0x0 },
+  { "noprofile", Int, &no_profile, (char **)0x0 },
+  { "norc", Int, &no_rc, (char **)0x0 },
+  { "posix", Int, &posixly_correct, (char **)0x0 },
+  { "protected", Int, &protected_mode, (char **)0x0 },
+  { "rcfile", Charp, (int *)0x0, &bashrc_file },
+#if defined (RESTRICTED_SHELL)
+  { "restricted", Int, &restricted, (char **)0x0 },
+#endif
+  { "verbose", Int, &echo_input_at_read, (char **)0x0 },
+  { "version", Int, &do_version, (char **)0x0 },
+  { "wordexp", Int, &wordexp_only, (char **)0x0 },
+  { (char *)0x0, Int, (int *)0x0, (char **)0x0 }
+};
+
+/* These are extern so execute_simple_command can set them, and then
+   longjmp back to main to execute a shell script, instead of calling
+   main () again and resulting in indefinite, possibly fatal, stack
+   growth. */
+procenv_t subshell_top_level;
+int subshell_argc;
+char **subshell_argv;
+char **subshell_envp;
+
+#if defined (BUFFERED_INPUT)
+/* The file descriptor from which the shell is reading input. */
+int default_buffered_input = -1;
+#endif
+
+/* The following two variables are not static so they can show up in $-. */
+int read_from_stdin;		/* -s flag supplied */
+int want_pending_command;	/* -c flag supplied */
+
+/* This variable is not static so it can be bound to $BASH_EXECUTION_STRING */
+char *command_execution_string;	/* argument to -c option */
+
+int malloc_trace_at_exit = 0;
+
+static int shell_reinitialized = 0;
+
+static FILE *default_input;
+
+static STRING_INT_ALIST *shopt_alist;
+static int shopt_ind = 0, shopt_len = 0;
+
+static int parse_long_options __P((char **, int, int));
+static int parse_shell_options __P((char **, int, int));
+static int bind_args __P((char **, int, int, int));
+
+static void start_debugger __P((void));
+
+static void add_shopt_to_alist __P((char *, int));
+static void run_shopt_alist __P((void));
+
+static void execute_env_file __P((char *));
+static void run_startup_files __P((void));
+static int open_shell_script __P((char *));
+static void set_bash_input __P((void));
+static int run_one_command __P((char *));
+static int run_wordexp __P((char *));
+
+static int uidget __P((void));
+
+static void init_interactive __P((void));
+static void init_noninteractive __P((void));
+
+static void set_shell_name __P((char *));
+static void shell_initialize __P((void));
+static void shell_reinitialize __P((void));
+
+static void show_shell_usage __P((FILE *, int));
+
+#ifdef __CYGWIN__
+static void
+_cygwin32_check_tmp ()
+{
+  struct stat sb;
+
+  if (stat ("/tmp", &sb) < 0)
+    internal_warning (_("could not find /tmp, please create!"));
+  else
+    {
+      if (S_ISDIR (sb.st_mode) == 0)
+	internal_warning (_("/tmp must be a valid directory name"));
+    }
+}
+#endif /* __CYGWIN__ */
+
+#if defined (NO_MAIN_ENV_ARG)
+/* systems without third argument to main() */
+int
+main (argc, argv)
+     int argc;
+     char **argv;
+#else /* !NO_MAIN_ENV_ARG */
+int
+main (argc, argv, env)
+     int argc;
+     char **argv, **env;
+#endif /* !NO_MAIN_ENV_ARG */
+{
+  register int i;
+  int code, old_errexit_flag;
+#if defined (RESTRICTED_SHELL)
+  int saverst;
+#endif
+  volatile int locally_skip_execution;
+  volatile int arg_index, top_level_arg_index;
+#ifdef __OPENNT
+  char **env;
+
+  env = environ;
+#endif /* __OPENNT */
+
+  USE_VAR(argc);
+  USE_VAR(argv);
+  USE_VAR(env);
+  USE_VAR(code);
+  USE_VAR(old_errexit_flag);
+#if defined (RESTRICTED_SHELL)
+  USE_VAR(saverst);
+#endif
+
+  /* Catch early SIGINTs. */
+  code = setjmp (top_level);
+  if (code)
+    exit (2);
+
+#if defined (USING_BASH_MALLOC) && defined (DEBUG) && !defined (DISABLE_MALLOC_WRAPPERS)
+#  if 1
+  malloc_set_register (1);
+#  endif
+#endif
+
+  check_dev_tty ();
+
+#ifdef __CYGWIN__
+  _cygwin32_check_tmp ();
+#endif /* __CYGWIN__ */
+
+  /* Wait forever if we are debugging a login shell. */
+  while (debugging_login_shell) sleep (3);
+
+  set_default_locale ();
+
+  running_setuid = uidget ();
+
+  if (getenv ("POSIXLY_CORRECT") || getenv ("POSIX_PEDANTIC"))
+    posixly_correct = 1;
+
+#if defined (USE_GNU_MALLOC_LIBRARY)
+  mcheck (programming_error, (void (*) ())0);
+#endif /* USE_GNU_MALLOC_LIBRARY */
+
+  if (setjmp (subshell_top_level))
+    {
+      argc = subshell_argc;
+      argv = subshell_argv;
+      env = subshell_envp;
+      sourced_env = 0;
+    }
+
+  shell_reinitialized = 0;
+
+  /* Initialize `local' variables for all `invocations' of main (). */
+  arg_index = 1;
+  if (arg_index > argc)
+    arg_index = argc;
+  command_execution_string = (char *)NULL;
+  want_pending_command = locally_skip_execution = read_from_stdin = 0;
+  default_input = stdin;
+#if defined (BUFFERED_INPUT)
+  default_buffered_input = -1;
+#endif
+
+  /* Fix for the `infinite process creation' bug when running shell scripts
+     from startup files on System V. */
+  login_shell = make_login_shell = 0;
+
+  /* If this shell has already been run, then reinitialize it to a
+     vanilla state. */
+  if (shell_initialized || shell_name)
+    {
+      /* Make sure that we do not infinitely recurse as a login shell. */
+      if (*shell_name == '-')
+	shell_name++;
+
+      shell_reinitialize ();
+      if (setjmp (top_level))
+	exit (2);
+    }
+
+  shell_environment = env;
+  set_shell_name (argv[0]);
+  shell_start_time = NOW;	/* NOW now defined in general.h */
+
+  /* Parse argument flags from the input line. */
+
+  /* Find full word arguments first. */
+  arg_index = parse_long_options (argv, arg_index, argc);
+
+  if (want_initial_help)
+    {
+      show_shell_usage (stdout, 1);
+      exit (EXECUTION_SUCCESS);
+    }
+
+  if (do_version)
+    {
+      show_shell_version (1);
+      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 != 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 ();
+
+#define CLOSE_FDS_AT_LOGIN
+#if defined (CLOSE_FDS_AT_LOGIN)
+  /*
+   * 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.
+   */
+  if (login_shell && interactive_shell)
+    {
+      for (i = 3; i < 20; i++)
+	close (i);
+    }
+#endif /* CLOSE_FDS_AT_LOGIN */
+
+  /* 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_locale_vars ();
+
+  if (interactive_shell)
+    {
+      char *term, *emacs;
+
+      term = get_string_value ("TERM");
+      no_line_editing |= term && (STREQ (term, "emacs"));
+      emacs = get_string_value ("EMACS");
+      running_under_emacs = emacs ? ((strstr (emacs, "term") != 0) ? 2 : 1) : 0;
+#if 0
+      no_line_editing |= emacs && emacs[0] == 't' && emacs[1] == '\0';
+#else
+      no_line_editing |= emacs && emacs[0] == 't' && emacs[1] == '\0' && STREQ (term, "dumb");
+#endif
+      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 (wordexp_only)
+    {
+      startup_state = 3;
+      last_command_exit_value = run_wordexp (argv[arg_index]);
+      exit_shell (last_command_exit_value);
+    }
+
+  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. */
+      remember_mail_dates ();
+      reset_mail_timer ();
+
+#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;
+{
+  /* 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 (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
+     restore the original terminal process group.  Don't do this if we're
+     in a subshell and calling exit_shell after, for example, a failed
+     word expansion. */
+  if (subshell_environment == 0)
+    end_job_control ();
+#endif /* JOB_CONTROL */
+
+  /* Always return the exit status of the last command to our parent. */
+  sh_exit (s);
+}
+
+/* A wrapper for exit that (optionally) can do other things, like malloc
+   statistics tracing. */
+void
+sh_exit (s)
+     int s;
+{
+#if defined (MALLOC_DEBUG) && defined (USING_BASH_MALLOC)
+  if (malloc_trace_at_exit)
+    trace_malloc_stats (get_name_for_error (), (char *)NULL);
+#endif
+
+  exit (s);
+}
+
+/* Source the bash startup files.  If POSIXLY_CORRECT is non-zero, we obey
+   the Posix.2 startup file rules:  $ENV is expanded, and if the file it
+   names exists, that file is sourced.  The Posix.2 rules are in effect
+   for interactive shells only. (section 4.56.5.3) */
+
+/* Execute ~/.bashrc for most shells.  Never execute it if
+   ACT_LIKE_SH is set, or if NO_RC is set.
+
+   If the executable file "/usr/gnu/src/bash/foo" contains:
+
+   #!/usr/gnu/bin/bash
+   echo hello
+
+   then:
+
+	 COMMAND	    EXECUTE BASHRC
+	 --------------------------------
+	 bash -c foo		NO
+	 bash foo		NO
+	 foo			NO
+	 rsh machine ls		YES (for rsh, which calls `bash -c')
+	 rsh machine foo	YES (for shell started by rsh) NO (for foo!)
+	 echo ls | bash		NO
+	 login			NO
+	 bash			YES
+*/
+
+static void
+execute_env_file (env_file)
+      char *env_file;
+{
+  char *fn;
+
+  if (env_file && *env_file)
+    {
+      fn = expand_string_unsplit_to_string (env_file, Q_DOUBLE_QUOTES);
+      if (fn && *fn)
+	maybe_execute_file (fn, 1);
+      FREE (fn);
+    }
+}
+
+static void
+run_startup_files ()
+{
+#if defined (JOB_CONTROL)
+  int old_job_control;
+#endif
+  int sourced_login, run_by_ssh;
+
+  /* get the rshd/sshd case out of the way first. */
+  if (interactive_shell == 0 && no_rc == 0 && login_shell == 0 &&
+      act_like_sh == 0 && command_execution_string)
+    {
+#ifdef SSH_SOURCE_BASHRC
+      run_by_ssh = (find_variable ("SSH_CLIENT") != (SHELL_VAR *)0) ||
+		   (find_variable ("SSH2_CLIENT") != (SHELL_VAR *)0);
+#else
+      run_by_ssh = 0;
+#endif
+
+      /* If we were run by sshd or we think we were run by rshd, execute
+	 ~/.bashrc if we are a top-level shell. */
+      if ((run_by_ssh || isnetconn (fileno (stdin))) && shell_level < 2)
+	{
+#ifdef SYS_BASHRC
+#  if defined (__OPENNT)
+	  maybe_execute_file (_prefixInstallPath(SYS_BASHRC, NULL, 0), 1);
+#  else
+	  maybe_execute_file (SYS_BASHRC, 1);
+#  endif
+#endif
+	  maybe_execute_file (bashrc_file, 1);
+	  return;
+	}
+    }
+
+#if defined (JOB_CONTROL)
+  /* Startup files should be run without job control enabled. */
+  old_job_control = interactive_shell ? set_job_control (0) : 0;
+#endif
+
+  sourced_login = 0;
+
+  /* A shell begun with the --login (or -l) flag that is not in posix mode
+     runs the login shell startup files, no matter whether or not it is
+     interactive.  If NON_INTERACTIVE_LOGIN_SHELLS is defined, run the
+     startup files if argv[0][0] == '-' as well. */
+#if defined (NON_INTERACTIVE_LOGIN_SHELLS)
+  if (login_shell && posixly_correct == 0)
+#else
+  if (login_shell < 0 && posixly_correct == 0)
+#endif
+    {
+      /* We don't execute .bashrc for login shells. */
+      no_rc++;
+
+      /* Execute /etc/profile and one of the personal login shell
+	 initialization files. */
+      if (no_profile == 0)
+	{
+	  maybe_execute_file (SYS_PROFILE, 1);
+
+	  if (act_like_sh)	/* sh */
+	    maybe_execute_file ("~/.profile", 1);
+	  else if ((maybe_execute_file ("~/.bash_profile", 1) == 0) &&
+		   (maybe_execute_file ("~/.bash_login", 1) == 0))	/* bash */
+	    maybe_execute_file ("~/.profile", 1);
+	}
+
+      sourced_login = 1;
+    }
+
+  /* A non-interactive shell not named `sh' and not in posix mode reads and
+     executes commands from $BASH_ENV.  If `su' starts a shell with `-c cmd'
+     and `-su' as the name of the shell, we want to read the startup files.
+     No other non-interactive shells read any startup files. */
+  if (interactive_shell == 0 && !(su_shell && login_shell))
+    {
+      if (posixly_correct == 0 && act_like_sh == 0 && privileged_mode == 0 &&
+	    sourced_env++ == 0)
+	execute_env_file (get_string_value ("BASH_ENV"));
+      return;
+    }
+
+  /* Interactive shell or `-su' shell. */
+  if (posixly_correct == 0)		  /* bash, sh */
+    {
+      if (login_shell && sourced_login++ == 0)
+	{
+	  /* We don't execute .bashrc for login shells. */
+	  no_rc++;
+
+	  /* Execute /etc/profile and one of the personal login shell
+	     initialization files. */
+	  if (no_profile == 0)
+	    {
+	      maybe_execute_file (SYS_PROFILE, 1);
+
+	      if (act_like_sh)	/* sh */
+		maybe_execute_file ("~/.profile", 1);
+	      else if ((maybe_execute_file ("~/.bash_profile", 1) == 0) &&
+		       (maybe_execute_file ("~/.bash_login", 1) == 0))	/* bash */
+		maybe_execute_file ("~/.profile", 1);
+	    }
+	}
+
+      /* bash */
+      if (act_like_sh == 0 && no_rc == 0)
+	{
+#ifdef SYS_BASHRC
+#  if defined (__OPENNT)
+	  maybe_execute_file (_prefixInstallPath(SYS_BASHRC, NULL, 0), 1);
+#  else
+	  maybe_execute_file (SYS_BASHRC, 1);
+#  endif
+#endif
+	  maybe_execute_file (bashrc_file, 1);
+	}
+      /* sh */
+      else if (act_like_sh && privileged_mode == 0 && sourced_env++ == 0)
+	execute_env_file (get_string_value ("ENV"));
+    }
+  else		/* bash --posix, sh --posix */
+    {
+      /* bash and sh */
+      if (interactive_shell && privileged_mode == 0 && sourced_env++ == 0)
+	execute_env_file (get_string_value ("ENV"));
+    }
+
+#if defined (JOB_CONTROL)
+  set_job_control (old_job_control);
+#endif
+}
+
+#if defined (RESTRICTED_SHELL)
+/* Return 1 if the shell should be a restricted one based on NAME or the
+   value of `restricted'.  Don't actually do anything, just return a
+   boolean value. */
+int
+shell_is_restricted (name)
+     char *name;
+{
+  char *temp;
+
+  if (restricted)
+    return 1;
+  temp = base_pathname (name);
+  if (*temp == '-')
+    temp++;
+  return (STREQ (temp, RESTRICTED_SHELL_NAME));
+}
+
+/* Perhaps make this shell a `restricted' one, based on NAME.  If the
+   basename of NAME is "rbash", then this shell is restricted.  The
+   name of the restricted shell is a configurable option, see config.h.
+   In a restricted shell, PATH, SHELL, ENV, and BASH_ENV are read-only
+   and non-unsettable.
+   Do this also if `restricted' is already set to 1; maybe the shell was
+   started with -r. */
+int
+maybe_make_restricted (name)
+     char *name;
+{
+  char *temp;
+
+  temp = base_pathname (name);
+  if (*temp == '-')
+    temp++;
+  if (restricted || (STREQ (temp, RESTRICTED_SHELL_NAME)))
+    {
+      set_var_read_only ("PATH");
+      set_var_read_only ("SHELL");
+      set_var_read_only ("ENV");
+      set_var_read_only ("BASH_ENV");
+      restricted = 1;
+    }
+  return (restricted);
+}
+#endif /* RESTRICTED_SHELL */
+
+/* Fetch the current set of uids and gids and return 1 if we're running
+   setuid or setgid. */
+static int
+uidget ()
+{
+  uid_t u;
+
+  u = getuid ();
+  if (current_user.uid != u)
+    {
+      FREE (current_user.user_name);
+      FREE (current_user.shell);
+      FREE (current_user.home_dir);
+      current_user.user_name = current_user.shell = current_user.home_dir = (char *)NULL;
+    }
+  current_user.uid = u;
+  current_user.gid = getgid ();
+  current_user.euid = geteuid ();
+  current_user.egid = getegid ();
+
+  /* See whether or not we are running setuid or setgid. */
+  return (current_user.uid != current_user.euid) ||
+	   (current_user.gid != current_user.egid);
+}
+
+void
+disable_priv_mode ()
+{
+  setuid (current_user.uid);
+  setgid (current_user.gid);
+  current_user.euid = current_user.uid;
+  current_user.egid = current_user.gid;
+}
+
+static int
+run_wordexp (words)
+     char *words;
+{
+  int code, nw, nb;
+  WORD_LIST *wl, *tl, *result;
+
+  code = setjmp (top_level);
+
+  if (code != NOT_JUMPED)
+    {
+      switch (code)
+	{
+	  /* Some kind of throw to top_level has occured. */
+	case FORCE_EOF:
+	  return last_command_exit_value = 127;
+	case ERREXIT:
+	case EXITPROG:
+	  return last_command_exit_value;
+	case DISCARD:
+	  return last_command_exit_value = 1;
+	default:
+	  command_error ("run_wordexp", CMDERR_BADJUMP, code, 0);
+	}
+    }
+
+  /* Run it through the parser to get a list of words and expand them */
+  if (words && *words)
+    {
+      with_input_from_string (words, "--wordexp");
+      if (parse_command () != 0)
+	return (126);
+      if (global_command == 0)
+	{
+	  printf ("0\n0\n");
+	  return (0);
+	}
+      if (global_command->type != cm_simple)
+	return (126);
+      wl = global_command->value.Simple->words;
+      if (protected_mode)
+	for (tl = wl; tl; tl = tl->next)
+	  tl->word->flags |= W_NOCOMSUB;
+      result = wl ? expand_words_no_vars (wl) : (WORD_LIST *)0;
+    }
+  else
+    result = (WORD_LIST *)0;
+
+  last_command_exit_value = 0;
+
+  if (result == 0)
+    {
+      printf ("0\n0\n");
+      return (0);
+    }
+
+  /* Count up the number of words and bytes, and print them.  Don't count
+     the trailing NUL byte. */
+  for (nw = nb = 0, wl = result; wl; wl = wl->next)
+    {
+      nw++;
+      nb += strlen (wl->word->word);
+    }
+  printf ("%u\n%u\n", nw, nb);
+  /* Print each word on a separate line.  This will have to be changed when
+     the interface to glibc is completed. */
+  for (wl = result; wl; wl = wl->next)
+    printf ("%s\n", wl->word->word);
+
+  return (0);
+}
+
+#if defined (ONESHOT)
+/* Run one command, given as the argument to the -c option.  Tell
+   parse_and_execute not to fork for a simple command. */
+static int
+run_one_command (command)
+     char *command;
+{
+  int code;
+
+  code = setjmp (top_level);
+
+  if (code != NOT_JUMPED)
+    {
+#if defined (PROCESS_SUBSTITUTION)
+      unlink_fifo_list ();
+#endif /* PROCESS_SUBSTITUTION */
+      switch (code)
+	{
+	  /* Some kind of throw to top_level has occured. */
+	case FORCE_EOF:
+	  return last_command_exit_value = 127;
+	case ERREXIT:
+	case EXITPROG:
+	  return last_command_exit_value;
+	case DISCARD:
+	  return last_command_exit_value = 1;
+	default:
+	  command_error ("run_one_command", CMDERR_BADJUMP, code, 0);
+	}
+    }
+   return (parse_and_execute (savestring (command), "-c", SEVAL_NOHIST));
+}
+#endif /* ONESHOT */
+
+static int
+bind_args (argv, arg_start, arg_end, start_index)
+     char **argv;
+     int arg_start, arg_end, start_index;
+{
+  register int i;
+  WORD_LIST *args;
+
+  for (i = arg_start, args = (WORD_LIST *)NULL; i < arg_end; i++)
+    args = make_word_list (make_word (argv[i]), args);
+  if (args)
+    {
+      args = REVERSE_LIST (args, WORD_LIST *);
+      if (start_index == 0)	/* bind to $0...$n for sh -c command */
+	{
+	  /* Posix.2 4.56.3 says that the first argument after sh -c command
+	     becomes $0, and the rest of the arguments become $1...$n */
+	  shell_name = savestring (args->word->word);
+	  FREE (dollar_vars[0]);
+	  dollar_vars[0] = savestring (args->word->word);
+	  remember_args (args->next, 1);
+	  push_args (args->next);	/* BASH_ARGV and BASH_ARGC */
+	}
+      else			/* bind to $1...$n for shell script */
+        {
+	  remember_args (args, 1);
+	  push_args (args);		/* BASH_ARGV and BASH_ARGC */
+        }
+
+      dispose_words (args);
+    }
+
+  return (i);
+}
+
+void
+unbind_args ()
+{
+  remember_args ((WORD_LIST *)NULL, 1);
+  pop_args ();				/* Reset BASH_ARGV and BASH_ARGC */
+}
+
+static void
+start_debugger ()
+{
+#if defined (DEBUGGER) && defined (DEBUGGER_START_FILE)
+  int old_errexit;
+
+  old_errexit = exit_immediately_on_error;
+  exit_immediately_on_error = 0;
+
+  maybe_execute_file (DEBUGGER_START_FILE, 1);
+  function_trace_mode = 1;
+
+  exit_immediately_on_error += old_errexit;
+#endif
+}
+
+static int
+open_shell_script (script_name)
+     char *script_name;
+{
+  int fd, e, fd_is_tty;
+  char *filename, *path_filename, *t;
+  char sample[80];
+  int sample_len;
+  struct stat sb;
+#if defined (ARRAY_VARS)
+  SHELL_VAR *funcname_v, *bash_source_v, *bash_lineno_v;
+  ARRAY *funcname_a, *bash_source_a, *bash_lineno_a;
+#endif
+
+  filename = savestring (script_name);
+
+  fd = open (filename, O_RDONLY);
+  if ((fd < 0) && (errno == ENOENT) && (absolute_program (filename) == 0))
+    {
+      e = errno;
+      /* If it's not in the current directory, try looking through PATH
+	 for it. */
+      path_filename = find_path_file (script_name);
+      if (path_filename)
+	{
+	  free (filename);
+	  filename = path_filename;
+	  fd = open (filename, O_RDONLY);
+	}
+      else
+	errno = e;
+    }
+
+  if (fd < 0)
+    {
+      e = errno;
+      file_error (filename);
+      exit ((e == ENOENT) ? EX_NOTFOUND : EX_NOINPUT);
+    }
+
+  free (dollar_vars[0]);
+  dollar_vars[0] = savestring (script_name);
+
+#if defined (ARRAY_VARS)
+  GET_ARRAY_FROM_VAR ("FUNCNAME", funcname_v, funcname_a);
+  GET_ARRAY_FROM_VAR ("BASH_SOURCE", bash_source_v, bash_source_a);
+  GET_ARRAY_FROM_VAR ("BASH_LINENO", bash_lineno_v, bash_lineno_a);
+
+  array_push (bash_source_a, filename);
+  if (bash_lineno_a)
+    {
+      t = itos (executing_line_number ());
+      array_push (bash_lineno_a, t);
+      free (t);
+    }
+  array_push (funcname_a, "main");
+#endif
+
+#ifdef HAVE_DEV_FD
+  fd_is_tty = isatty (fd);
+#else
+  fd_is_tty = 0;
+#endif
+
+  /* Only do this with non-tty file descriptors we can seek on. */
+  if (fd_is_tty == 0 && (lseek (fd, 0L, 1) != -1))
+    {
+      /* Check to see if the `file' in `bash file' is a binary file
+	 according to the same tests done by execute_simple_command (),
+	 and report an error and exit if it is. */
+      sample_len = read (fd, sample, sizeof (sample));
+      if (sample_len < 0)
+	{
+	  e = errno;
+	  if ((fstat (fd, &sb) == 0) && S_ISDIR (sb.st_mode))
+	    internal_error (_("%s: is a directory"), filename);
+	  else
+	    {
+	      errno = e;
+	      file_error (filename);
+	    }
+	  exit (EX_NOEXEC);
+	}
+      else if (sample_len > 0 && (check_binary_file (sample, sample_len)))
+	{
+	  internal_error ("%s: cannot execute binary file", filename);
+	  exit (EX_BINARY_FILE);
+	}
+      /* Now rewind the file back to the beginning. */
+      lseek (fd, 0L, 0);
+    }
+
+  /* Open the script.  But try to move the file descriptor to a randomly
+     large one, in the hopes that any descriptors used by the script will
+     not match with ours. */
+  fd = move_to_high_fd (fd, 0, -1);
+
+#if defined (__CYGWIN__) && defined (O_TEXT)
+  setmode (fd, O_TEXT);
+#endif
+
+#if defined (BUFFERED_INPUT)
+  default_buffered_input = fd;
+  SET_CLOSE_ON_EXEC (default_buffered_input);
+#else /* !BUFFERED_INPUT */
+  default_input = fdopen (fd, "r");
+
+  if (default_input == 0)
+    {
+      file_error (filename);
+      exit (EX_NOTFOUND);
+    }
+
+  SET_CLOSE_ON_EXEC (fd);
+  if (fileno (default_input) != fd)
+    SET_CLOSE_ON_EXEC (fileno (default_input));
+#endif /* !BUFFERED_INPUT */
+
+  /* Just about the only way for this code to be executed is if something
+     like `bash -i /dev/stdin' is executed. */
+  if (interactive_shell && fd_is_tty)
+    {
+      dup2 (fd, 0);
+      close (fd);
+      fd = 0;
+#if defined (BUFFERED_INPUT)
+      default_buffered_input = 0;
+#else
+      fclose (default_input);
+      default_input = stdin;
+#endif
+    }
+  else if (forced_interactive && fd_is_tty == 0)
+    /* But if a script is called with something like `bash -i scriptname',
+       we need to do a non-interactive setup here, since we didn't do it
+       before. */
+    init_noninteractive ();
+
+  free (filename);
+  return (fd);
+}
+
+/* Initialize the input routines for the parser. */
+static void
+set_bash_input ()
+{
+  /* Make sure the fd from which we are reading input is not in
+     no-delay mode. */
+#if defined (BUFFERED_INPUT)
+  if (interactive == 0)
+    sh_unset_nodelay_mode (default_buffered_input);
+  else
+#endif /* !BUFFERED_INPUT */
+    sh_unset_nodelay_mode (fileno (stdin));
+
+  /* with_input_from_stdin really means `with_input_from_readline' */
+  if (interactive && no_line_editing == 0)
+    with_input_from_stdin ();
+#if defined (BUFFERED_INPUT)
+  else if (interactive == 0)
+    with_input_from_buffered_stream (default_buffered_input, dollar_vars[0]);
+#endif /* BUFFERED_INPUT */
+  else
+    with_input_from_stream (default_input, dollar_vars[0]);
+}
+
+/* Close the current shell script input source and forget about it.  This is
+   extern so execute_cmd.c:initialize_subshell() can call it.  If CHECK_ZERO
+   is non-zero, we close default_buffered_input even if it's the standard
+   input (fd 0). */
+void
+unset_bash_input (check_zero)
+     int check_zero;
+{
+#if defined (BUFFERED_INPUT)
+  if ((check_zero && default_buffered_input >= 0) ||
+      (check_zero == 0 && default_buffered_input > 0))
+    {
+      close_buffered_fd (default_buffered_input);
+      default_buffered_input = bash_input.location.buffered_fd = -1;
+    }
+#else /* !BUFFERED_INPUT */
+  if (default_input)
+    {
+      fclose (default_input);
+      default_input = (FILE *)NULL;
+    }
+#endif /* !BUFFERED_INPUT */
+}
+      
+
+#if !defined (PROGRAM)
+#  define PROGRAM "bash"
+#endif
+
+static void
+set_shell_name (argv0)
+     char *argv0;
+{
+  /* Here's a hack.  If the name of this shell is "sh", then don't do
+     any startup files; just try to be more like /bin/sh. */
+  shell_name = argv0 ? base_pathname (argv0) : PROGRAM;
+
+  if (*shell_name == '-')
+    {
+      shell_name++;
+      login_shell++;
+    }
+
+  if (shell_name[0] == 's' && shell_name[1] == 'h' && shell_name[2] == '\0')
+    act_like_sh++;
+  if (shell_name[0] == 's' && shell_name[1] == 'u' && shell_name[2] == '\0')
+    su_shell++;
+
+  shell_name = argv0 ? argv0 : PROGRAM;
+  FREE (dollar_vars[0]);
+  dollar_vars[0] = savestring (shell_name);
+
+  /* A program may start an interactive shell with
+	  "execl ("/bin/bash", "-", NULL)".
+     If so, default the name of this shell to our name. */
+  if (!shell_name || !*shell_name || (shell_name[0] == '-' && !shell_name[1]))
+    shell_name = PROGRAM;
+}
+
+static void
+init_interactive ()
+{
+  interactive_shell = startup_state = interactive = 1;
+  expand_aliases = 1;
+}
+
+static void
+init_noninteractive ()
+{
+#if defined (HISTORY)
+  bash_history_reinit (0);
+#endif /* HISTORY */
+  interactive_shell = startup_state = interactive = 0;
+  expand_aliases = posixly_correct;	/* XXX - was 0 not posixly_correct */
+  no_line_editing = 1;
+#if defined (JOB_CONTROL)
+  set_job_control (0);
+#endif /* JOB_CONTROL */
+}
+
+void
+get_current_user_info ()
+{
+  struct passwd *entry;
+
+  /* Don't fetch this more than once. */
+  if (current_user.user_name == 0)
+    {
+      entry = getpwuid (current_user.uid);
+      if (entry)
+	{
+	  current_user.user_name = savestring (entry->pw_name);
+	  current_user.shell = (entry->pw_shell && entry->pw_shell[0])
+				? savestring (entry->pw_shell)
+				: savestring ("/bin/sh");
+	  current_user.home_dir = savestring (entry->pw_dir);
+	}
+      else
+	{
+	  current_user.user_name = _("I have no name!");
+	  current_user.user_name = savestring (current_user.user_name);
+	  current_user.shell = savestring ("/bin/sh");
+	  current_user.home_dir = savestring ("/");
+	}
+      endpwent ();
+    }
+}
+
+/* Do whatever is necessary to initialize the shell.
+   Put new initializations in here. */
+static void
+shell_initialize ()
+{
+  char hostname[256];
+
+  /* Line buffer output for stderr and stdout. */
+  if (shell_initialized == 0)
+    {
+      sh_setlinebuf (stderr);
+      sh_setlinebuf (stdout);
+    }
+
+  /* Sort the array of shell builtins so that the binary search in
+     find_shell_builtin () works correctly. */
+  initialize_shell_builtins ();
+
+  /* Initialize the trap signal handlers before installing our own
+     signal handlers.  traps.c:restore_original_signals () is responsible
+     for restoring the original default signal handlers.  That function
+     is called when we make a new child. */
+  initialize_traps ();
+  initialize_signals (0);
+
+  /* It's highly unlikely that this will change. */
+  if (current_host_name == 0)
+    {
+      /* Initialize current_host_name. */
+      if (gethostname (hostname, 255) < 0)
+	current_host_name = "??host??";
+      else
+	current_host_name = savestring (hostname);
+    }
+
+  /* Initialize the stuff in current_user that comes from the password
+     file.  We don't need to do this right away if the shell is not
+     interactive. */
+  if (interactive_shell)
+    get_current_user_info ();
+
+  /* Initialize our interface to the tilde expander. */
+  tilde_initialize ();
+
+  /* Initialize internal and environment variables.  Don't import shell
+     functions from the environment if we are running in privileged or
+     restricted mode or if the shell is running setuid. */
+#if defined (RESTRICTED_SHELL)
+  initialize_shell_variables (shell_environment, privileged_mode||restricted||running_setuid);
+#else
+  initialize_shell_variables (shell_environment, privileged_mode||running_setuid);
+#endif
+
+  /* Initialize the data structures for storing and running jobs. */
+  initialize_job_control (0);
+
+  /* Initialize input streams to null. */
+  initialize_bash_input ();
+
+  initialize_flags ();
+
+  /* Initialize the shell options.  Don't import the shell options
+     from the environment variable $SHELLOPTS if we are running in
+     privileged or restricted mode or if the shell is running setuid. */
+#if defined (RESTRICTED_SHELL)
+  initialize_shell_options (privileged_mode||restricted||running_setuid);
+#else
+  initialize_shell_options (privileged_mode||running_setuid);
+#endif
+}
+
+/* Function called by main () when it appears that the shell has already
+   had some initialization performed.  This is supposed to reset the world
+   back to a pristine state, as if we had been exec'ed. */
+static void
+shell_reinitialize ()
+{
+  /* The default shell prompts. */
+  primary_prompt = PPROMPT;
+  secondary_prompt = SPROMPT;
+
+  /* Things that get 1. */
+  current_command_number = 1;
+
+  /* We have decided that the ~/.bashrc file should not be executed
+     for the invocation of each shell script.  If the variable $ENV
+     (or $BASH_ENV) is set, its value is used as the name of a file
+     to source. */
+  no_rc = no_profile = 1;
+
+  /* Things that get 0. */
+  login_shell = make_login_shell = interactive = executing = 0;
+  debugging = do_version = line_number = last_command_exit_value = 0;
+  forced_interactive = interactive_shell = subshell_environment = 0;
+  expand_aliases = 0;
+
+#if defined (HISTORY)
+  bash_history_reinit (0);
+#endif /* HISTORY */
+
+#if defined (RESTRICTED_SHELL)
+  restricted = 0;
+#endif /* RESTRICTED_SHELL */
+
+  /* Ensure that the default startup file is used.  (Except that we don't
+     execute this file for reinitialized shells). */
+  bashrc_file = "~/.bashrc";
+
+  /* Delete all variables and functions.  They will be reinitialized when
+     the environment is parsed. */
+  delete_all_contexts (shell_variables);
+  delete_all_variables (shell_functions);
+
+  shell_reinitialized = 1;
+}
+
+static void
+show_shell_usage (fp, extra)
+     FILE *fp;
+     int extra;
+{
+  int i;
+  char *set_opts, *s, *t;
+
+  if (extra)
+    fprintf (fp, "GNU bash, version %s-(%s)\n", shell_version_string (), MACHTYPE);
+  fprintf (fp, _("Usage:\t%s [GNU long option] [option] ...\n\t%s [GNU long option] [option] script-file ...\n"),
+	     shell_name, shell_name);
+  fputs (_("GNU long options:\n"), fp);
+  for (i = 0; long_args[i].name; i++)
+    fprintf (fp, "\t--%s\n", long_args[i].name);
+
+  fputs (_("Shell options:\n"), fp);
+  fputs (_("\t-irsD or -c command or -O shopt_option\t\t(invocation only)\n"), fp);
+
+  for (i = 0, set_opts = 0; shell_builtins[i].name; i++)
+    if (STREQ (shell_builtins[i].name, "set"))
+      set_opts = savestring (shell_builtins[i].short_doc);
+  if (set_opts)
+    {
+      s = xstrchr (set_opts, '[');
+      if (s == 0)
+	s = set_opts;
+      while (*++s == '-')
+	;
+      t = xstrchr (s, ']');
+      if (t)
+	*t = '\0';
+      fprintf (fp, _("\t-%s or -o option\n"), s);
+      free (set_opts);
+    }
+
+  if (extra)
+    {
+      fprintf (fp, _("Type `%s -c \"help set\"' for more information about shell options.\n"), shell_name);
+      fprintf (fp, _("Type `%s -c help' for more information about shell builtin commands.\n"), shell_name);
+      fprintf (fp, _("Use the `bashbug' command to report bugs.\n"));
+    }
+}
+
+static void
+add_shopt_to_alist (opt, on_or_off)
+     char *opt;
+     int on_or_off;
+{
+  if (shopt_ind >= shopt_len)
+    {
+      shopt_len += 8;
+      shopt_alist = (STRING_INT_ALIST *)xrealloc (shopt_alist, shopt_len * sizeof (shopt_alist[0]));
+    }
+  shopt_alist[shopt_ind].word = opt;
+  shopt_alist[shopt_ind].token = on_or_off;
+  shopt_ind++;
+}
+
+static void
+run_shopt_alist ()
+{
+  register int i;
+
+  for (i = 0; i < shopt_ind; i++)
+    if (shopt_setopt (shopt_alist[i].word, (shopt_alist[i].token == '-')) != EXECUTION_SUCCESS)
+      exit (EX_BADUSAGE);
+  free (shopt_alist);
+  shopt_alist = 0;
+  shopt_ind = shopt_len = 0;
+}