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

1 files changed, 4278 insertions, 0 deletions

diff --git a/variables.c b/variables.c
new file mode 100644
index 0000000..62e2604
--- /dev/null
+++ b/variables.c
@@ -0,0 +1,4278 @@
+/* variables.c -- Functions for hacking shell variables. */
+
+/* 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. */
+
+#include "config.h"
+
+#include "bashtypes.h"
+#include "posixstat.h"
+#include "posixtime.h"
+
+#if defined (qnx)
+#  if defined (qnx6)
+#    include <sy/netmgr.h>
+#  else
+#    include <sys/vc.h>
+#  endif /* !qnx6 */
+#endif /* qnx */
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include "chartypes.h"
+#include <pwd.h>
+#include "bashansi.h"
+#include "bashintl.h"
+
+#include "shell.h"
+#include "flags.h"
+#include "execute_cmd.h"
+#include "findcmd.h"
+#include "mailcheck.h"
+#include "input.h"
+#include "hashcmd.h"
+#include "pathexp.h"
+
+#include "builtins/getopt.h"
+#include "builtins/common.h"
+
+#if defined (READLINE)
+#  include "bashline.h"
+#  include <readline/readline.h>
+#else
+#  include <tilde/tilde.h>
+#endif
+
+#if defined (HISTORY)
+#  include "bashhist.h"
+#  include <readline/history.h>
+#endif /* HISTORY */
+
+#if defined (PROGRAMMABLE_COMPLETION)
+#  include "pcomplete.h"
+#endif
+
+#define TEMPENV_HASH_BUCKETS	4	/* must be power of two */
+
+#define ifsname(s)	((s)[0] == 'I' && (s)[1] == 'F' && (s)[2] == 'S' && (s)[3] == '\0')
+
+extern char **environ;
+
+/* Variables used here and defined in other files. */
+extern int posixly_correct;
+extern int line_number;
+extern int subshell_environment, indirection_level, subshell_level;
+extern int build_version, patch_level;
+extern int expanding_redir;
+extern char *dist_version, *release_status;
+extern char *shell_name;
+extern char *primary_prompt, *secondary_prompt;
+extern char *current_host_name;
+extern sh_builtin_func_t *this_shell_builtin;
+extern SHELL_VAR *this_shell_function;
+extern char *the_printed_command_except_trap;
+extern char *this_command_name;
+extern char *command_execution_string;
+extern time_t shell_start_time;
+
+#if defined (READLINE)
+extern int no_line_editing;
+extern int perform_hostname_completion;
+#endif
+
+/* The list of shell variables that the user has created at the global
+   scope, or that came from the environment. */
+VAR_CONTEXT *global_variables = (VAR_CONTEXT *)NULL;
+
+/* The current list of shell variables, including function scopes */
+VAR_CONTEXT *shell_variables = (VAR_CONTEXT *)NULL;
+
+/* The list of shell functions that the user has created, or that came from
+   the environment. */
+HASH_TABLE *shell_functions = (HASH_TABLE *)NULL;
+
+#if defined (DEBUGGER)
+/* The table of shell function definitions that the user defined or that
+   came from the environment. */
+HASH_TABLE *shell_function_defs = (HASH_TABLE *)NULL;
+#endif
+
+/* The current variable context.  This is really a count of how deep into
+   executing functions we are. */
+int variable_context = 0;
+
+/* The set of shell assignments which are made only in the environment
+   for a single command. */
+HASH_TABLE *temporary_env = (HASH_TABLE *)NULL;
+
+/* Set to non-zero if an assignment error occurs while putting variables
+   into the temporary environment. */
+int tempenv_assign_error;
+
+/* Some funky variables which are known about specially.  Here is where
+   "$*", "$1", and all the cruft is kept. */
+char *dollar_vars[10];
+WORD_LIST *rest_of_args = (WORD_LIST *)NULL;
+
+/* The value of $$. */
+pid_t dollar_dollar_pid;
+
+/* An array which is passed to commands as their environment.  It is
+   manufactured from the union of the initial environment and the
+   shell variables that are marked for export. */
+char **export_env = (char **)NULL;
+static int export_env_index;
+static int export_env_size;
+
+#if defined (READLINE)
+static int winsize_assignment;		/* currently assigning to LINES or COLUMNS */
+static int winsize_assigned;		/* assigned to LINES or COLUMNS */
+#endif
+
+/* Non-zero means that we have to remake EXPORT_ENV. */
+int array_needs_making = 1;
+
+/* The number of times BASH has been executed.  This is set
+   by initialize_variables (). */
+int shell_level = 0;
+
+/* Some forward declarations. */
+static void set_machine_vars __P((void));
+static void set_home_var __P((void));
+static void set_shell_var __P((void));
+static char *get_bash_name __P((void));
+static void initialize_shell_level __P((void));
+static void uidset __P((void));
+#if defined (ARRAY_VARS)
+static void make_vers_array __P((void));
+#endif
+
+static SHELL_VAR *null_assign __P((SHELL_VAR *, char *, arrayind_t));
+#if defined (ARRAY_VARS)
+static SHELL_VAR *null_array_assign __P((SHELL_VAR *, char *, arrayind_t));
+#endif
+static SHELL_VAR *get_self __P((SHELL_VAR *));
+
+#if defined (ARRAY_VARS)
+static SHELL_VAR *init_dynamic_array_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
+#endif
+
+static SHELL_VAR *assign_seconds __P((SHELL_VAR *, char *, arrayind_t));
+static SHELL_VAR *get_seconds __P((SHELL_VAR *));
+static SHELL_VAR *init_seconds_var __P((void));
+
+static int brand __P((void));
+static void sbrand __P((unsigned long));		/* set bash random number generator. */
+static SHELL_VAR *assign_random __P((SHELL_VAR *, char *, arrayind_t));
+static SHELL_VAR *get_random __P((SHELL_VAR *));
+
+static SHELL_VAR *assign_lineno __P((SHELL_VAR *, char *, arrayind_t));
+static SHELL_VAR *get_lineno __P((SHELL_VAR *));
+
+static SHELL_VAR *assign_subshell __P((SHELL_VAR *, char *, arrayind_t));
+static SHELL_VAR *get_subshell __P((SHELL_VAR *));
+
+#if defined (HISTORY)
+static SHELL_VAR *get_histcmd __P((SHELL_VAR *));
+#endif
+
+#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
+static SHELL_VAR *assign_dirstack __P((SHELL_VAR *, char *, arrayind_t));
+static SHELL_VAR *get_dirstack __P((SHELL_VAR *));
+#endif
+
+#if defined (ARRAY_VARS)
+static SHELL_VAR *get_groupset __P((SHELL_VAR *));
+#endif
+
+static SHELL_VAR *get_funcname __P((SHELL_VAR *));
+static SHELL_VAR *init_funcname_var __P((void));
+
+static void initialize_dynamic_variables __P((void));
+
+static SHELL_VAR *hash_lookup __P((const char *, HASH_TABLE *));
+static SHELL_VAR *new_shell_variable __P((const char *));
+static SHELL_VAR *make_new_variable __P((const char *, HASH_TABLE *));
+static SHELL_VAR *bind_variable_internal __P((const char *, char *, HASH_TABLE *, int, int));
+
+static void free_variable_hash_data __P((PTR_T));
+
+static VARLIST *vlist_alloc __P((int));
+static VARLIST *vlist_realloc __P((VARLIST *, int));
+static void vlist_add __P((VARLIST *, SHELL_VAR *, int));
+
+static void flatten __P((HASH_TABLE *, sh_var_map_func_t *, VARLIST *, int));
+
+static int qsort_var_comp __P((SHELL_VAR **, SHELL_VAR **));
+
+static SHELL_VAR **vapply __P((sh_var_map_func_t *));
+static SHELL_VAR **fapply __P((sh_var_map_func_t *));
+
+static int visible_var __P((SHELL_VAR *));
+static int visible_and_exported __P((SHELL_VAR *));
+static int local_and_exported __P((SHELL_VAR *));
+static int variable_in_context __P((SHELL_VAR *));
+#if defined (ARRAY_VARS)
+static int visible_array_vars __P((SHELL_VAR *));
+#endif
+
+static SHELL_VAR *bind_tempenv_variable __P((const char *, char *));
+static void push_temp_var __P((PTR_T));
+static void propagate_temp_var __P((PTR_T));
+static void dispose_temporary_env __P((sh_free_func_t *));     
+
+static inline char *mk_env_string __P((const char *, const char *));
+static char **make_env_array_from_var_list __P((SHELL_VAR **));
+static char **make_var_export_array __P((VAR_CONTEXT *));
+static char **make_func_export_array __P((void));
+static void add_temp_array_to_env __P((char **, int, int));
+
+static int n_shell_variables __P((void));
+static int set_context __P((SHELL_VAR *));
+
+static void push_func_var __P((PTR_T));
+static void push_exported_var __P((PTR_T));
+
+static inline int find_special_var __P((const char *));
+	       
+/* Initialize the shell variables from the current environment.
+   If PRIVMODE is nonzero, don't import functions from ENV or
+   parse $SHELLOPTS. */
+void
+initialize_shell_variables (env, privmode)
+     char **env;
+     int privmode;
+{
+  char *name, *string, *temp_string;
+  int c, char_index, string_index, string_length;
+  SHELL_VAR *temp_var;
+
+  if (shell_variables == 0)
+    {
+      shell_variables = global_variables = new_var_context ((char *)NULL, 0);
+      shell_variables->scope = 0;
+      shell_variables->table = hash_create (0);
+    }
+
+  if (shell_functions == 0)
+    shell_functions = hash_create (0);
+
+#if defined (DEBUGGER)
+  if (shell_function_defs == 0)
+    shell_function_defs = hash_create (0);
+#endif
+
+  for (string_index = 0; string = env[string_index++]; )
+    {
+      char_index = 0;
+      name = string;
+      while ((c = *string++) && c != '=')
+	;
+      if (string[-1] == '=')
+	char_index = string - name - 1;
+
+      /* If there are weird things in the environment, like `=xxx' or a
+	 string without an `=', just skip them. */
+      if (char_index == 0)
+	continue;
+
+      /* ASSERT(name[char_index] == '=') */
+      name[char_index] = '\0';
+      /* Now, name = env variable name, string = env variable value, and
+	 char_index == strlen (name) */
+
+      /* If exported function, define it now.  Don't import functions from
+	 the environment in privileged mode. */
+      if (privmode == 0 && read_but_dont_execute == 0 && STREQN ("() {", string, 4))
+	{
+	  string_length = strlen (string);
+	  temp_string = (char *)xmalloc (3 + string_length + char_index);
+
+	  strcpy (temp_string, name);
+	  temp_string[char_index] = ' ';
+	  strcpy (temp_string + char_index + 1, string);
+
+	  parse_and_execute (temp_string, name, SEVAL_NONINT|SEVAL_NOHIST);
+
+	  /* Ancient backwards compatibility.  Old versions of bash exported
+	     functions like name()=() {...} */
+	  if (name[char_index - 1] == ')' && name[char_index - 2] == '(')
+	    name[char_index - 2] = '\0';
+
+	  if (temp_var = find_function (name))
+	    {
+	      VSETATTR (temp_var, (att_exported|att_imported));
+	      array_needs_making = 1;
+	    }
+	  else
+	    report_error (_("error importing function definition for `%s'"), name);
+
+	  /* ( */
+	  if (name[char_index - 1] == ')' && name[char_index - 2] == '\0')
+	    name[char_index - 2] = '(';		/* ) */
+	}
+#if defined (ARRAY_VARS)
+#  if 0
+      /* Array variables may not yet be exported. */
+      else if (*string == '(' && string[1] == '[' && string[strlen (string) - 1] == ')')
+	{
+	  string_length = 1;
+	  temp_string = extract_array_assignment_list (string, &string_length);
+	  temp_var = assign_array_from_string (name, temp_string);
+	  FREE (temp_string);
+	  VSETATTR (temp_var, (att_exported | att_imported));
+	  array_needs_making = 1;
+	}
+#  endif
+#endif
+      else
+	{
+	  temp_var = bind_variable (name, string, 0);
+	  VSETATTR (temp_var, (att_exported | att_imported));
+	  array_needs_making = 1;
+	}
+
+      name[char_index] = '=';
+      /* temp_var can be NULL if it was an exported function with a syntax
+	 error (a different bug, but it still shouldn't dump core). */
+      if (temp_var && function_p (temp_var) == 0)	/* XXX not yet */
+	{
+	  CACHE_IMPORTSTR (temp_var, name);
+	}
+    }
+
+  set_pwd ();
+
+  /* Set up initial value of $_ */
+#if 0
+  temp_var = bind_variable ("_", dollar_vars[0], 0);
+#else
+  temp_var = set_if_not ("_", dollar_vars[0]);
+#endif
+
+  /* Remember this pid. */
+  dollar_dollar_pid = getpid ();
+
+  /* Now make our own defaults in case the vars that we think are
+     important are missing. */
+  temp_var = set_if_not ("PATH", DEFAULT_PATH_VALUE);
+#if 0
+  set_auto_export (temp_var);	/* XXX */
+#endif
+
+  temp_var = set_if_not ("TERM", "dumb");
+#if 0
+  set_auto_export (temp_var);	/* XXX */
+#endif
+
+#if defined (qnx)
+  /* set node id -- don't import it from the environment */
+  {
+    char node_name[22];
+#  if defined (qnx6)
+    netmgr_ndtostr(ND2S_LOCAL_STR, ND_LOCAL_NODE, node_name, sizeof(node_name));
+#  else
+    qnx_nidtostr (getnid (), node_name, sizeof (node_name));
+#  endif
+    temp_var = bind_variable ("NODE", node_name, 0);
+    set_auto_export (temp_var);
+  }
+#endif
+
+  /* set up the prompts. */
+  if (interactive_shell)
+    {
+#if defined (PROMPT_STRING_DECODE)
+      set_if_not ("PS1", primary_prompt);
+#else
+      if (current_user.uid == -1)
+	get_current_user_info ();
+      set_if_not ("PS1", current_user.euid == 0 ? "# " : primary_prompt);
+#endif
+      set_if_not ("PS2", secondary_prompt);
+    }
+  set_if_not ("PS4", "+ ");
+
+  /* Don't allow IFS to be imported from the environment. */
+  temp_var = bind_variable ("IFS", " \t\n", 0);
+  setifs (temp_var);
+
+  /* Magic machine types.  Pretty convenient. */
+  set_machine_vars ();
+
+  /* Default MAILCHECK for interactive shells.  Defer the creation of a
+     default MAILPATH until the startup files are read, because MAIL
+     names a mail file if MAILPATH is not set, and we should provide a
+     default only if neither is set. */
+  if (interactive_shell)
+    {
+      temp_var = set_if_not ("MAILCHECK", posixly_correct ? "600" : "60");
+      VSETATTR (temp_var, att_integer);
+    }
+
+  /* Do some things with shell level. */
+  initialize_shell_level ();
+
+  set_ppid ();
+
+  /* Initialize the `getopts' stuff. */
+  temp_var = bind_variable ("OPTIND", "1", 0);
+  VSETATTR (temp_var, att_integer);
+  getopts_reset (0);
+  bind_variable ("OPTERR", "1", 0);
+  sh_opterr = 1;
+
+  if (login_shell == 1)
+    set_home_var ();
+
+  /* Get the full pathname to THIS shell, and set the BASH variable
+     to it. */
+  name = get_bash_name ();
+  temp_var = bind_variable ("BASH", name, 0);
+  free (name);
+
+  /* Make the exported environment variable SHELL be the user's login
+     shell.  Note that the `tset' command looks at this variable
+     to determine what style of commands to output; if it ends in "csh",
+     then C-shell commands are output, else Bourne shell commands. */
+  set_shell_var ();
+
+  /* Make a variable called BASH_VERSION which contains the version info. */
+  bind_variable ("BASH_VERSION", shell_version_string (), 0);
+#if defined (ARRAY_VARS)
+  make_vers_array ();
+#endif
+
+  if (command_execution_string)
+    bind_variable ("BASH_EXECUTION_STRING", command_execution_string, 0);
+
+  /* Find out if we're supposed to be in Posix.2 mode via an
+     environment variable. */
+  temp_var = find_variable ("POSIXLY_CORRECT");
+  if (!temp_var)
+    temp_var = find_variable ("POSIX_PEDANTIC");
+  if (temp_var && imported_p (temp_var))
+    sv_strict_posix (temp_var->name);
+
+#if defined (HISTORY)
+  /* Set history variables to defaults, and then do whatever we would
+     do if the variable had just been set.  Do this only in the case
+     that we are remembering commands on the history list. */
+  if (remember_on_history)
+    {
+      name = bash_tilde_expand (posixly_correct ? "~/.sh_history" : "~/.bash_history", 0);
+
+      set_if_not ("HISTFILE", name);
+      free (name);
+
+      set_if_not ("HISTSIZE", "500");
+      sv_histsize ("HISTSIZE");
+    }
+#endif /* HISTORY */
+
+  /* Seed the random number generator. */
+  sbrand (dollar_dollar_pid + shell_start_time);
+
+  /* Handle some "special" variables that we may have inherited from a
+     parent shell. */
+  if (interactive_shell)
+    {
+      temp_var = find_variable ("IGNOREEOF");
+      if (!temp_var)
+	temp_var = find_variable ("ignoreeof");
+      if (temp_var && imported_p (temp_var))
+	sv_ignoreeof (temp_var->name);
+    }
+
+#if defined (HISTORY)
+  if (interactive_shell && remember_on_history)
+    {
+      sv_history_control ("HISTCONTROL");
+      sv_histignore ("HISTIGNORE");
+    }
+#endif /* HISTORY */
+
+#if defined (READLINE) && defined (STRICT_POSIX)
+  /* POSIXLY_CORRECT will only be 1 here if the shell was compiled
+     -DSTRICT_POSIX */
+  if (interactive_shell && posixly_correct && no_line_editing == 0)
+    rl_prefer_env_winsize = 1;
+#endif /* READLINE && STRICT_POSIX */
+
+     /*
+      * 24 October 2001
+      *
+      * I'm tired of the arguing and bug reports.  Bash now leaves SSH_CLIENT
+      * and SSH2_CLIENT alone.  I'm going to rely on the shell_level check in
+      * isnetconn() to avoid running the startup files more often than wanted.
+      * That will, of course, only work if the user's login shell is bash, so
+      * I've made that behavior conditional on SSH_SOURCE_BASHRC being defined
+      * in config-top.h.
+      */
+#if 0
+  temp_var = find_variable ("SSH_CLIENT");
+  if (temp_var && imported_p (temp_var))
+    {
+      VUNSETATTR (temp_var, att_exported);
+      array_needs_making = 1;
+    }
+  temp_var = find_variable ("SSH2_CLIENT");
+  if (temp_var && imported_p (temp_var))
+    {
+      VUNSETATTR (temp_var, att_exported);
+      array_needs_making = 1;
+    }
+#endif
+
+  /* Get the user's real and effective user ids. */
+  uidset ();
+
+  /* Initialize the dynamic variables, and seed their values. */
+  initialize_dynamic_variables ();
+}
+
+/* **************************************************************** */
+/*								    */
+/*	     Setting values for special shell variables		    */
+/*								    */
+/* **************************************************************** */
+
+static void
+set_machine_vars ()
+{
+  SHELL_VAR *temp_var;
+
+  temp_var = set_if_not ("HOSTTYPE", HOSTTYPE);
+  temp_var = set_if_not ("OSTYPE", OSTYPE);
+  temp_var = set_if_not ("MACHTYPE", MACHTYPE);
+
+  temp_var = set_if_not ("HOSTNAME", current_host_name);
+}
+
+/* Set $HOME to the information in the password file if we didn't get
+   it from the environment. */
+
+/* This function is not static so the tilde and readline libraries can
+   use it. */
+char *
+sh_get_home_dir ()
+{
+  if (current_user.home_dir == 0)
+    get_current_user_info ();
+  return current_user.home_dir;
+}
+
+static void
+set_home_var ()
+{
+  SHELL_VAR *temp_var;
+
+  temp_var = find_variable ("HOME");
+  if (temp_var == 0)
+    temp_var = bind_variable ("HOME", sh_get_home_dir (), 0);
+#if 0
+  VSETATTR (temp_var, att_exported);
+#endif
+}
+
+/* Set $SHELL to the user's login shell if it is not already set.  Call
+   get_current_user_info if we haven't already fetched the shell. */
+static void
+set_shell_var ()
+{
+  SHELL_VAR *temp_var;
+
+  temp_var = find_variable ("SHELL");
+  if (temp_var == 0)
+    {
+      if (current_user.shell == 0)
+	get_current_user_info ();
+      temp_var = bind_variable ("SHELL", current_user.shell, 0);
+    }
+#if 0
+  VSETATTR (temp_var, att_exported);
+#endif
+}
+
+static char *
+get_bash_name ()
+{
+  char *name;
+
+  if ((login_shell == 1) && RELPATH(shell_name))
+    {
+      if (current_user.shell == 0)
+	get_current_user_info ();
+      name = savestring (current_user.shell);
+    }
+  else if (ABSPATH(shell_name))
+    name = savestring (shell_name);
+  else if (shell_name[0] == '.' && shell_name[1] == '/')
+    {
+      /* Fast path for common case. */
+      char *cdir;
+      int len;
+
+      cdir = get_string_value ("PWD");
+      if (cdir)
+	{
+	  len = strlen (cdir);
+	  name = (char *)xmalloc (len + strlen (shell_name) + 1);
+	  strcpy (name, cdir);
+	  strcpy (name + len, shell_name + 1);
+	}
+      else
+	name = savestring (shell_name);
+    }
+  else
+    {
+      char *tname;
+      int s;
+
+      tname = find_user_command (shell_name);
+
+      if (tname == 0)
+	{
+	  /* Try the current directory.  If there is not an executable
+	     there, just punt and use the login shell. */
+	  s = file_status (shell_name);
+	  if (s & FS_EXECABLE)
+	    {
+	      tname = make_absolute (shell_name, get_string_value ("PWD"));
+	      if (*shell_name == '.')
+		{
+		  name = sh_canonpath (tname, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
+		  if (name == 0)
+		    name = tname;
+		  else
+		    free (tname);
+		}
+	     else
+		name = tname;
+	    }
+	  else
+	    {
+	      if (current_user.shell == 0)
+		get_current_user_info ();
+	      name = savestring (current_user.shell);
+	    }
+	}
+      else
+	{
+	  name = full_pathname (tname);
+	  free (tname);
+	}
+    }
+
+  return (name);
+}
+
+void
+adjust_shell_level (change)
+     int change;
+{
+  char new_level[5], *old_SHLVL;
+  intmax_t old_level;
+  SHELL_VAR *temp_var;
+
+  old_SHLVL = get_string_value ("SHLVL");
+  if (old_SHLVL == 0 || *old_SHLVL == '\0' || legal_number (old_SHLVL, &old_level) == 0)
+    old_level = 0;
+
+  shell_level = old_level + change;
+  if (shell_level < 0)
+    shell_level = 0;
+  else if (shell_level > 1000)
+    {
+      internal_warning (_("shell level (%d) too high, resetting to 1"), shell_level);
+      shell_level = 1;
+    }
+
+  /* We don't need the full generality of itos here. */
+  if (shell_level < 10)
+    {
+      new_level[0] = shell_level + '0';
+      new_level[1] = '\0';
+    }
+  else if (shell_level < 100)
+    {
+      new_level[0] = (shell_level / 10) + '0';
+      new_level[1] = (shell_level % 10) + '0';
+      new_level[2] = '\0';
+    }
+  else if (shell_level < 1000)
+    {
+      new_level[0] = (shell_level / 100) + '0';
+      old_level = shell_level % 100;
+      new_level[1] = (old_level / 10) + '0';
+      new_level[2] = (old_level % 10) + '0';
+      new_level[3] = '\0';
+    }
+
+  temp_var = bind_variable ("SHLVL", new_level, 0);
+  set_auto_export (temp_var);
+}
+
+static void
+initialize_shell_level ()
+{
+  adjust_shell_level (1);
+}
+
+/* If we got PWD from the environment, update our idea of the current
+   working directory.  In any case, make sure that PWD exists before
+   checking it.  It is possible for getcwd () to fail on shell startup,
+   and in that case, PWD would be undefined.  If this is an interactive
+   login shell, see if $HOME is the current working directory, and if
+   that's not the same string as $PWD, set PWD=$HOME. */
+
+void
+set_pwd ()
+{
+  SHELL_VAR *temp_var, *home_var;
+  char *temp_string, *home_string;
+
+  home_var = find_variable ("HOME");
+  home_string = home_var ? value_cell (home_var) : (char *)NULL;
+
+  temp_var = find_variable ("PWD");
+  if (temp_var && imported_p (temp_var) &&
+      (temp_string = value_cell (temp_var)) &&
+      same_file (temp_string, ".", (struct stat *)NULL, (struct stat *)NULL))
+    set_working_directory (temp_string);
+  else if (home_string && interactive_shell && login_shell &&
+	   same_file (home_string, ".", (struct stat *)NULL, (struct stat *)NULL))
+    {
+      set_working_directory (home_string);
+      temp_var = bind_variable ("PWD", home_string, 0);
+      set_auto_export (temp_var);
+    }
+  else
+    {
+      temp_string = get_working_directory ("shell-init");
+      if (temp_string)
+	{
+	  temp_var = bind_variable ("PWD", temp_string, 0);
+	  set_auto_export (temp_var);
+	  free (temp_string);
+	}
+    }
+
+  /* According to the Single Unix Specification, v2, $OLDPWD is an
+     `environment variable' and therefore should be auto-exported.
+     Make a dummy invisible variable for OLDPWD, and mark it as exported. */
+  temp_var = bind_variable ("OLDPWD", (char *)NULL, 0);
+  VSETATTR (temp_var, (att_exported | att_invisible));
+}
+
+/* Make a variable $PPID, which holds the pid of the shell's parent.  */
+void
+set_ppid ()
+{
+  char namebuf[INT_STRLEN_BOUND(pid_t) + 1], *name;
+  SHELL_VAR *temp_var;
+
+  name = inttostr (getppid (), namebuf, sizeof(namebuf));
+  temp_var = find_variable ("PPID");
+  if (temp_var)
+    VUNSETATTR (temp_var, (att_readonly | att_exported));
+  temp_var = bind_variable ("PPID", name, 0);
+  VSETATTR (temp_var, (att_readonly | att_integer));
+}
+
+static void
+uidset ()
+{
+  char buff[INT_STRLEN_BOUND(uid_t) + 1], *b;
+  register SHELL_VAR *v;
+
+  b = inttostr (current_user.uid, buff, sizeof (buff));
+  v = find_variable ("UID");
+  if (v == 0)
+    {
+      v = bind_variable ("UID", b, 0);
+      VSETATTR (v, (att_readonly | att_integer));
+    }
+
+  if (current_user.euid != current_user.uid)
+    b = inttostr (current_user.euid, buff, sizeof (buff));
+
+  v = find_variable ("EUID");
+  if (v == 0)
+    {
+      v = bind_variable ("EUID", b, 0);
+      VSETATTR (v, (att_readonly | att_integer));
+    }
+}
+
+#if defined (ARRAY_VARS)
+static void
+make_vers_array ()
+{
+  SHELL_VAR *vv;
+  ARRAY *av;
+  char *s, d[32], b[INT_STRLEN_BOUND(int) + 1];
+
+  unbind_variable ("BASH_VERSINFO");
+
+  vv = make_new_array_variable ("BASH_VERSINFO");
+  av = array_cell (vv);
+  strcpy (d, dist_version);
+  s = xstrchr (d, '.');
+  if (s)
+    *s++ = '\0';
+  array_insert (av, 0, d);
+  array_insert (av, 1, s);
+  s = inttostr (patch_level, b, sizeof (b));
+  array_insert (av, 2, s);
+  s = inttostr (build_version, b, sizeof (b));
+  array_insert (av, 3, s);
+  array_insert (av, 4, release_status);
+  array_insert (av, 5, MACHTYPE);
+
+  VSETATTR (vv, att_readonly);
+}
+#endif /* ARRAY_VARS */
+
+/* Set the environment variables $LINES and $COLUMNS in response to
+   a window size change. */
+void
+sh_set_lines_and_columns (lines, cols)
+     int lines, cols;
+{
+  char val[INT_STRLEN_BOUND(int) + 1], *v;
+
+  /* If we are currently assigning to LINES or COLUMNS, don't do anything. */
+  if (winsize_assignment)
+    return;
+
+  v = inttostr (lines, val, sizeof (val));
+  bind_variable ("LINES", v, 0);
+
+  v = inttostr (cols, val, sizeof (val));
+  bind_variable ("COLUMNS", v, 0);
+}
+
+/* **************************************************************** */
+/*								    */
+/*		   Printing variables and values		    */
+/*								    */
+/* **************************************************************** */
+
+/* Print LIST (a list of shell variables) to stdout in such a way that
+   they can be read back in. */
+void
+print_var_list (list)
+     register SHELL_VAR **list;
+{
+  register int i;
+  register SHELL_VAR *var;
+
+  for (i = 0; list && (var = list[i]); i++)
+    if (invisible_p (var) == 0)
+      print_assignment (var);
+}
+
+/* Print LIST (a list of shell functions) to stdout in such a way that
+   they can be read back in. */
+void
+print_func_list (list)
+     register SHELL_VAR **list;
+{
+  register int i;
+  register SHELL_VAR *var;
+
+  for (i = 0; list && (var = list[i]); i++)
+    {
+      printf ("%s ", var->name);
+      print_var_function (var);
+      printf ("\n");
+    }
+}
+      
+/* Print the value of a single SHELL_VAR.  No newline is
+   output, but the variable is printed in such a way that
+   it can be read back in. */
+void
+print_assignment (var)
+     SHELL_VAR *var;
+{
+  if (var_isset (var) == 0)
+    return;
+
+  if (function_p (var))
+    {
+      printf ("%s", var->name);
+      print_var_function (var);
+      printf ("\n");
+    }
+#if defined (ARRAY_VARS)
+  else if (array_p (var))
+    print_array_assignment (var, 0);
+#endif /* ARRAY_VARS */
+  else
+    {
+      printf ("%s=", var->name);
+      print_var_value (var, 1);
+      printf ("\n");
+    }
+}
+
+/* Print the value cell of VAR, a shell variable.  Do not print
+   the name, nor leading/trailing newline.  If QUOTE is non-zero,
+   and the value contains shell metacharacters, quote the value
+   in such a way that it can be read back in. */
+void
+print_var_value (var, quote)
+     SHELL_VAR *var;
+     int quote;
+{
+  char *t;
+
+  if (var_isset (var) == 0)
+    return;
+
+  if (quote && posixly_correct == 0 && ansic_shouldquote (value_cell (var)))
+    {
+      t = ansic_quote (value_cell (var), 0, (int *)0);
+      printf ("%s", t);
+      free (t);
+    }
+  else if (quote && sh_contains_shell_metas (value_cell (var)))
+    {
+      t = sh_single_quote (value_cell (var));
+      printf ("%s", t);
+      free (t);
+    }
+  else
+    printf ("%s", value_cell (var));
+}
+
+/* Print the function cell of VAR, a shell variable.  Do not
+   print the name, nor leading/trailing newline. */
+void
+print_var_function (var)
+     SHELL_VAR *var;
+{
+  if (function_p (var) && var_isset (var))
+    printf ("%s", named_function_string ((char *)NULL, function_cell(var), 1));
+}
+
+/* **************************************************************** */
+/*								    */
+/*		 	Dynamic Variables			    */
+/*								    */
+/* **************************************************************** */
+
+/* DYNAMIC VARIABLES
+
+   These are variables whose values are generated anew each time they are
+   referenced.  These are implemented using a pair of function pointers
+   in the struct variable: assign_func, which is called from bind_variable
+   and, if arrays are compiled into the shell, some of the functions in
+   arrayfunc.c, and dynamic_value, which is called from find_variable.
+
+   assign_func is called from bind_variable_internal, if
+   bind_variable_internal discovers that the variable being assigned to
+   has such a function.  The function is called as
+	SHELL_VAR *temp = (*(entry->assign_func)) (entry, value, ind)
+   and the (SHELL_VAR *)temp is returned as the value of bind_variable.  It
+   is usually ENTRY (self).  IND is an index for an array variable, and
+   unused otherwise.
+
+   dynamic_value is called from find_variable_internal to return a `new'
+   value for the specified dynamic varible.  If this function is NULL,
+   the variable is treated as a `normal' shell variable.  If it is not,
+   however, then this function is called like this:
+	tempvar = (*(var->dynamic_value)) (var);
+
+   Sometimes `tempvar' will replace the value of `var'.  Other times, the
+   shell will simply use the string value.  Pretty object-oriented, huh?
+
+   Be warned, though: if you `unset' a special variable, it loses its
+   special meaning, even if you subsequently set it.
+
+   The special assignment code would probably have been better put in
+   subst.c: do_assignment_internal, in the same style as
+   stupidly_hack_special_variables, but I wanted the changes as
+   localized as possible.  */
+
+#define INIT_DYNAMIC_VAR(var, val, gfunc, afunc) \
+  do \
+    { \
+      v = bind_variable (var, (val), 0); \
+      v->dynamic_value = gfunc; \
+      v->assign_func = afunc; \
+    } \
+  while (0)
+
+#define INIT_DYNAMIC_ARRAY_VAR(var, gfunc, afunc) \
+  do \
+    { \
+      v = make_new_array_variable (var); \
+      v->dynamic_value = gfunc; \
+      v->assign_func = afunc; \
+    } \
+  while (0)
+
+static SHELL_VAR *
+null_assign (self, value, unused)
+     SHELL_VAR *self;
+     char *value;
+     arrayind_t unused;
+{
+  return (self);
+}
+
+#if defined (ARRAY_VARS)
+static SHELL_VAR *
+null_array_assign (self, value, ind)
+     SHELL_VAR *self;
+     char *value;
+     arrayind_t ind;
+{
+  return (self);
+}
+#endif
+
+/* Degenerate `dynamic_value' function; just returns what's passed without
+   manipulation. */
+static SHELL_VAR *
+get_self (self)
+     SHELL_VAR *self;
+{
+  return (self);
+}
+
+#if defined (ARRAY_VARS)
+/* A generic dynamic array variable initializer.  Intialize array variable
+   NAME with dynamic value function GETFUNC and assignment function SETFUNC. */
+static SHELL_VAR *
+init_dynamic_array_var (name, getfunc, setfunc, attrs)
+     char *name;
+     sh_var_value_func_t *getfunc;
+     sh_var_assign_func_t *setfunc;
+     int attrs;
+{
+  SHELL_VAR *v;
+
+  v = find_variable (name);
+  if (v)
+    return (v);
+  INIT_DYNAMIC_ARRAY_VAR (name, getfunc, setfunc);
+  if (attrs)
+    VSETATTR (v, attrs);
+  return v;
+}
+#endif
+
+
+/* The value of $SECONDS.  This is the number of seconds since shell
+   invocation, or, the number of seconds since the last assignment + the
+   value of the last assignment. */
+static intmax_t seconds_value_assigned;
+
+static SHELL_VAR *
+assign_seconds (self, value, unused)
+     SHELL_VAR *self;
+     char *value;
+     arrayind_t unused;
+{
+  if (legal_number (value, &seconds_value_assigned) == 0)
+    seconds_value_assigned = 0;
+  shell_start_time = NOW;
+  return (self);
+}
+
+static SHELL_VAR *
+get_seconds (var)
+     SHELL_VAR *var;
+{
+  time_t time_since_start;
+  char *p;
+
+  time_since_start = NOW - shell_start_time;
+  p = itos(seconds_value_assigned + time_since_start);
+
+  FREE (value_cell (var));
+
+  VSETATTR (var, att_integer);
+  var_setvalue (var, p);
+  return (var);
+}
+
+static SHELL_VAR *
+init_seconds_var ()
+{
+  SHELL_VAR *v;
+
+  v = find_variable ("SECONDS");
+  if (v)
+    {
+      if (legal_number (value_cell(v), &seconds_value_assigned) == 0)
+	seconds_value_assigned = 0;
+    }
+  INIT_DYNAMIC_VAR ("SECONDS", (v ? value_cell (v) : (char *)NULL), get_seconds, assign_seconds);
+  return v;      
+}
+     
+/* The random number seed.  You can change this by setting RANDOM. */
+static unsigned long rseed = 1;
+static int last_random_value;
+static int seeded_subshell = 0;
+
+/* A linear congruential random number generator based on the example
+   one in the ANSI C standard.  This one isn't very good, but a more
+   complicated one is overkill. */
+
+/* Returns a pseudo-random number between 0 and 32767. */
+static int
+brand ()
+{
+  rseed = rseed * 1103515245 + 12345;
+  return ((unsigned int)((rseed >> 16) & 32767));	/* was % 32768 */
+}
+
+/* Set the random number generator seed to SEED. */
+static void
+sbrand (seed)
+     unsigned long seed;
+{
+  rseed = seed;
+  last_random_value = 0;
+}
+
+static SHELL_VAR *
+assign_random (self, value, unused)
+     SHELL_VAR *self;
+     char *value;
+     arrayind_t unused;
+{
+  sbrand (strtoul (value, (char **)NULL, 10));
+  if (subshell_environment)
+    seeded_subshell = 1;
+  return (self);
+}
+
+int
+get_random_number ()
+{
+  int rv;
+
+  /* Reset for command and process substitution. */
+  if (subshell_environment && seeded_subshell == 0)
+    {
+      sbrand (rseed + getpid() + NOW);
+      seeded_subshell = 1;
+    }
+
+  do
+    rv = brand ();
+  while (rv == last_random_value);
+  return rv;
+}
+
+static SHELL_VAR *
+get_random (var)
+     SHELL_VAR *var;
+{
+  int rv;
+  char *p;
+
+  rv = get_random_number ();
+  last_random_value = rv;
+  p = itos (rv);
+
+  FREE (value_cell (var));
+
+  VSETATTR (var, att_integer);
+  var_setvalue (var, p);
+  return (var);
+}
+
+static SHELL_VAR *
+assign_lineno (var, value, unused)
+     SHELL_VAR *var;
+     char *value;
+     arrayind_t unused;
+{
+  intmax_t new_value;
+
+  if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0)
+    new_value = 0;
+  line_number = new_value;
+  return var;
+}
+
+/* Function which returns the current line number. */
+static SHELL_VAR *
+get_lineno (var)
+     SHELL_VAR *var;
+{
+  char *p;
+  int ln;
+
+  ln = executing_line_number ();
+  p = itos (ln);
+  FREE (value_cell (var));
+  var_setvalue (var, p);
+  return (var);
+}
+
+static SHELL_VAR *
+assign_subshell (var, value, unused)
+     SHELL_VAR *var;
+     char *value;
+     arrayind_t unused;
+{
+  intmax_t new_value;
+
+  if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0)
+    new_value = 0;
+  subshell_level = new_value;
+  return var;
+}
+
+static SHELL_VAR *
+get_subshell (var)
+     SHELL_VAR *var;
+{
+  char *p;
+
+  p = itos (subshell_level);
+  FREE (value_cell (var));
+  var_setvalue (var, p);
+  return (var);
+}
+
+static SHELL_VAR *
+get_bash_command (var)
+     SHELL_VAR *var;
+{
+  char *p;
+
+  
+  if (the_printed_command_except_trap)
+    p = savestring (the_printed_command_except_trap);
+  else
+    {
+      p = (char *)xmalloc (1);
+      p[0] = '\0';
+    }
+  FREE (value_cell (var));
+  var_setvalue (var, p);
+  return (var);
+}
+
+#if defined (HISTORY)
+static SHELL_VAR *
+get_histcmd (var)
+     SHELL_VAR *var;
+{
+  char *p;
+
+  p = itos (history_number ());
+  FREE (value_cell (var));
+  var_setvalue (var, p);
+  return (var);
+}
+#endif
+
+#if defined (READLINE)
+/* When this function returns, VAR->value points to malloced memory. */
+static SHELL_VAR *
+get_comp_wordbreaks (var)
+     SHELL_VAR *var;
+{
+  char *p;
+
+  /* If we don't have anything yet, assign a default value. */
+  if (rl_completer_word_break_characters == 0 && bash_readline_initialized == 0)
+    enable_hostname_completion (perform_hostname_completion);
+
+#if 0
+  FREE (value_cell (var));
+  p = savestring (rl_completer_word_break_characters);
+  
+  var_setvalue (var, p);
+#else
+  var_setvalue (var, rl_completer_word_break_characters);
+#endif
+
+  return (var);
+}
+
+/* When this function returns, rl_completer_word_break_characters points to
+   malloced memory. */
+static SHELL_VAR *
+assign_comp_wordbreaks (self, value, unused)
+     SHELL_VAR *self;
+     char *value;
+     arrayind_t unused;
+{
+  if (rl_completer_word_break_characters &&
+      rl_completer_word_break_characters != rl_basic_word_break_characters)
+    free (rl_completer_word_break_characters);
+
+  rl_completer_word_break_characters = savestring (value);
+  return self;
+}
+#endif /* READLINE */
+
+#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
+static SHELL_VAR *
+assign_dirstack (self, value, ind)
+     SHELL_VAR *self;
+     char *value;
+     arrayind_t ind;
+{
+  set_dirstack_element (ind, 1, value);
+  return self;
+}
+
+static SHELL_VAR *
+get_dirstack (self)
+     SHELL_VAR *self;
+{
+  ARRAY *a;
+  WORD_LIST *l;
+
+  l = get_directory_stack ();
+  a = array_from_word_list (l);
+  array_dispose (array_cell (self));
+  dispose_words (l);
+  var_setarray (self, a);
+  return self;
+}
+#endif /* PUSHD AND POPD && ARRAY_VARS */
+
+#if defined (ARRAY_VARS)
+/* We don't want to initialize the group set with a call to getgroups()
+   unless we're asked to, but we only want to do it once. */
+static SHELL_VAR *
+get_groupset (self)
+     SHELL_VAR *self;
+{
+  register int i;
+  int ng;
+  ARRAY *a;
+  static char **group_set = (char **)NULL;
+
+  if (group_set == 0)
+    {
+      group_set = get_group_list (&ng);
+      a = array_cell (self);
+      for (i = 0; i < ng; i++)
+	array_insert (a, i, group_set[i]);
+    }
+  return (self);
+}
+#endif /* ARRAY_VARS */
+
+/* If ARRAY_VARS is not defined, this just returns the name of any
+   currently-executing function.  If we have arrays, it's a call stack. */
+static SHELL_VAR *
+get_funcname (self)
+     SHELL_VAR *self;
+{
+#if ! defined (ARRAY_VARS)
+  char *t;
+  if (variable_context && this_shell_function)
+    {
+      FREE (value_cell (self));
+      t = savestring (this_shell_function->name);
+      var_setvalue (self, t);
+    }
+#endif
+  return (self);
+}
+
+void
+make_funcname_visible (on_or_off)
+     int on_or_off;
+{
+  SHELL_VAR *v;
+
+  v = find_variable ("FUNCNAME");
+  if (v == 0 || v->dynamic_value == 0)
+    return;
+
+  if (on_or_off)
+    VUNSETATTR (v, att_invisible);
+  else
+    VSETATTR (v, att_invisible);
+}
+
+static SHELL_VAR *
+init_funcname_var ()
+{
+  SHELL_VAR *v;
+
+  v = find_variable ("FUNCNAME");
+  if (v)
+    return v;
+#if defined (ARRAY_VARS)
+  INIT_DYNAMIC_ARRAY_VAR ("FUNCNAME", get_funcname, null_array_assign);
+#else
+  INIT_DYNAMIC_VAR ("FUNCNAME", (char *)NULL, get_funcname, null_assign);
+#endif
+  VSETATTR (v, att_invisible|att_noassign);
+  return v;
+}
+
+static void
+initialize_dynamic_variables ()
+{
+  SHELL_VAR *v;
+
+  v = init_seconds_var ();
+
+  INIT_DYNAMIC_VAR ("BASH_COMMAND", (char *)NULL, get_bash_command, (sh_var_assign_func_t *)NULL);
+  INIT_DYNAMIC_VAR ("BASH_SUBSHELL", (char *)NULL, get_subshell, assign_subshell);
+
+  INIT_DYNAMIC_VAR ("RANDOM", (char *)NULL, get_random, assign_random);
+  VSETATTR (v, att_integer);
+  INIT_DYNAMIC_VAR ("LINENO", (char *)NULL, get_lineno, assign_lineno);
+  VSETATTR (v, att_integer);
+
+#if defined (HISTORY)
+  INIT_DYNAMIC_VAR ("HISTCMD", (char *)NULL, get_histcmd, (sh_var_assign_func_t *)NULL);
+  VSETATTR (v, att_integer);
+#endif
+
+#if defined (READLINE)
+  INIT_DYNAMIC_VAR ("COMP_WORDBREAKS", (char *)NULL, get_comp_wordbreaks, assign_comp_wordbreaks);
+#endif
+
+#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
+  v = init_dynamic_array_var ("DIRSTACK", get_dirstack, assign_dirstack, 0);
+#endif /* PUSHD_AND_POPD && ARRAY_VARS */
+
+#if defined (ARRAY_VARS)
+  v = init_dynamic_array_var ("GROUPS", get_groupset, null_array_assign, att_noassign);
+
+#  if defined (DEBUGGER)
+  v = init_dynamic_array_var ("BASH_ARGC", get_self, null_array_assign, att_noassign|att_nounset);
+  v = init_dynamic_array_var ("BASH_ARGV", get_self, null_array_assign, att_noassign|att_nounset);
+#  endif /* DEBUGGER */
+  v = init_dynamic_array_var ("BASH_SOURCE", get_self, null_array_assign, att_noassign|att_nounset);
+  v = init_dynamic_array_var ("BASH_LINENO", get_self, null_array_assign, att_noassign|att_nounset);
+#endif
+
+  v = init_funcname_var ();
+}
+
+/* **************************************************************** */
+/*								    */
+/*		Retrieving variables and values			    */
+/*								    */
+/* **************************************************************** */
+
+/* How to get a pointer to the shell variable or function named NAME.
+   HASHED_VARS is a pointer to the hash table containing the list
+   of interest (either variables or functions). */
+
+static SHELL_VAR *
+hash_lookup (name, hashed_vars)
+     const char *name;
+     HASH_TABLE *hashed_vars;
+{
+  BUCKET_CONTENTS *bucket;
+
+  bucket = hash_search (name, hashed_vars, 0);
+  return (bucket ? (SHELL_VAR *)bucket->data : (SHELL_VAR *)NULL);
+}
+
+SHELL_VAR *
+var_lookup (name, vcontext)
+     const char *name;
+     VAR_CONTEXT *vcontext;
+{
+  VAR_CONTEXT *vc;
+  SHELL_VAR *v;
+
+  v = (SHELL_VAR *)NULL;
+  for (vc = vcontext; vc; vc = vc->down)
+    if (v = hash_lookup (name, vc->table))
+      break;
+
+  return v;
+}
+
+/* Look up the variable entry named NAME.  If SEARCH_TEMPENV is non-zero,
+   then also search the temporarily built list of exported variables.
+   The lookup order is:
+	temporary_env
+        shell_variables list
+*/
+
+SHELL_VAR *
+find_variable_internal (name, force_tempenv)
+     const char *name;
+     int force_tempenv;
+{
+  SHELL_VAR *var;
+  int search_tempenv;
+
+  var = (SHELL_VAR *)NULL;
+
+  /* If explicitly requested, first look in the temporary environment for
+     the variable.  This allows constructs such as "foo=x eval 'echo $foo'"
+     to get the `exported' value of $foo.  This happens if we are executing
+     a function or builtin, or if we are looking up a variable in a
+     "subshell environment". */
+  search_tempenv = force_tempenv || (expanding_redir == 0 && subshell_environment);
+
+  if (search_tempenv && temporary_env)		
+    var = hash_lookup (name, temporary_env);
+
+  if (var == 0)
+    var = var_lookup (name, shell_variables);
+
+  if (var == 0)
+    return ((SHELL_VAR *)NULL);
+
+  return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
+}
+
+/* Look up the variable entry named NAME.  Returns the entry or NULL. */
+SHELL_VAR *
+find_variable (name)
+     const char *name;
+{
+  return (find_variable_internal (name, (expanding_redir == 0 && this_shell_builtin != 0)));
+}
+
+/* Look up the function entry whose name matches STRING.
+   Returns the entry or NULL. */
+SHELL_VAR *
+find_function (name)
+     const char *name;
+{
+  return (hash_lookup (name, shell_functions));
+}
+
+/* Find the function definition for the shell function named NAME.  Returns
+   the entry or NULL. */
+FUNCTION_DEF *
+find_function_def (name)
+     const char *name;
+{
+  return ((FUNCTION_DEF *)hash_lookup (name, shell_function_defs));
+}
+
+/* Return the value of VAR.  VAR is assumed to have been the result of a
+   lookup without any subscript, if arrays are compiled into the shell. */
+char *
+get_variable_value (var)
+     SHELL_VAR *var;
+{
+  if (var == 0)
+    return ((char *)NULL);
+#if defined (ARRAY_VARS)
+  else if (array_p (var))
+    return (array_reference (array_cell (var), 0));
+#endif
+  else
+    return (value_cell (var));
+}
+
+/* Return the string value of a variable.  Return NULL if the variable
+   doesn't exist.  Don't cons a new string.  This is a potential memory
+   leak if the variable is found in the temporary environment.  Since
+   functions and variables have separate name spaces, returns NULL if
+   var_name is a shell function only. */
+char *
+get_string_value (var_name)
+     const char *var_name;
+{
+  SHELL_VAR *var;
+
+  var = find_variable (var_name);
+  return ((var) ? get_variable_value (var) : (char *)NULL);
+}
+
+/* This is present for use by the tilde and readline libraries. */
+char *
+sh_get_env_value (v)
+     const char *v;
+{
+  return get_string_value (v);
+}
+
+/* **************************************************************** */
+/*								    */
+/*		  Creating and setting variables		    */
+/*								    */
+/* **************************************************************** */
+
+/* Set NAME to VALUE if NAME has no value. */
+SHELL_VAR *
+set_if_not (name, value)
+     char *name, *value;
+{
+  SHELL_VAR *v;
+
+  v = find_variable (name);
+  if (v == 0)
+    v = bind_variable_internal (name, value, global_variables->table, HASH_NOSRCH, 0);
+  return (v);
+}
+
+/* Create a local variable referenced by NAME. */
+SHELL_VAR *
+make_local_variable (name)
+     const char *name;
+{
+  SHELL_VAR *new_var, *old_var;
+  VAR_CONTEXT *vc;
+  int was_tmpvar;
+  char *tmp_value;
+
+  /* local foo; local foo;  is a no-op. */
+  old_var = find_variable (name);
+  if (old_var && local_p (old_var) && old_var->context == variable_context)
+    {
+      VUNSETATTR (old_var, att_invisible);
+      return (old_var);
+    }
+
+  was_tmpvar = old_var && tempvar_p (old_var);
+  if (was_tmpvar)
+    tmp_value = value_cell (old_var);
+
+  for (vc = shell_variables; vc; vc = vc->down)
+    if (vc_isfuncenv (vc) && vc->scope == variable_context)
+      break;
+
+  if (vc == 0)
+    {
+      internal_error (_("make_local_variable: no function context at current scope"));
+      return ((SHELL_VAR *)NULL);
+    }
+  else if (vc->table == 0)
+    vc->table = hash_create (TEMPENV_HASH_BUCKETS);
+
+  /* Since this is called only from the local/declare/typeset code, we can
+     call builtin_error here without worry (of course, it will also work
+     for anything that sets this_command_name).  Variables with the `noassign'
+     attribute may not be made local.  The test against old_var's context
+     level is to disallow local copies of readonly global variables (since I
+     believe that this could be a security hole).  Readonly copies of calling
+     function local variables are OK. */
+  if (old_var && (noassign_p (old_var) ||
+		 (readonly_p (old_var) && old_var->context == 0)))
+    {
+      if (readonly_p (old_var))
+	sh_readonly (name);
+      return ((SHELL_VAR *)NULL);
+    }
+
+  if (old_var == 0)
+    new_var = bind_variable_internal (name, "", vc->table, HASH_NOSRCH, 0);
+  else
+    {
+      new_var = make_new_variable (name, vc->table);
+
+      /* If we found this variable in one of the temporary environments,
+	 inherit its value.  Watch to see if this causes problems with
+	 things like `x=4 local x'. */
+      if (was_tmpvar)
+        var_setvalue (new_var, savestring (tmp_value));
+
+      new_var->attributes = exported_p (old_var) ? att_exported : 0;
+    }
+
+  vc->flags |= VC_HASLOCAL;
+
+  new_var->context = variable_context;
+  VSETATTR (new_var, att_local);
+
+  if (ifsname (name))
+    setifs (new_var);
+
+  return (new_var);
+}
+
+#if defined (ARRAY_VARS)
+SHELL_VAR *
+make_local_array_variable (name)
+     char *name;
+{
+  SHELL_VAR *var;
+  ARRAY *array;
+
+  var = make_local_variable (name);
+  if (var == 0 || array_p (var))
+    return var;
+
+  array = array_create ();
+
+  FREE (value_cell(var));
+  var_setarray (var, array);
+  VSETATTR (var, att_array);
+  return var;
+}
+#endif /* ARRAY_VARS */
+
+/* Create a new shell variable with name NAME. */
+static SHELL_VAR *
+new_shell_variable (name)
+     const char *name;
+{
+  SHELL_VAR *entry;
+
+  entry = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR));
+
+  entry->name = savestring (name);
+  var_setvalue (entry, (char *)NULL);
+  CLEAR_EXPORTSTR (entry);
+
+  entry->dynamic_value = (sh_var_value_func_t *)NULL;
+  entry->assign_func = (sh_var_assign_func_t *)NULL;
+
+  entry->attributes = 0;
+
+  /* Always assume variables are to be made at toplevel!
+     make_local_variable has the responsibilty of changing the
+     variable context. */
+  entry->context = 0;
+
+  return (entry);
+}
+
+/* Create a new shell variable with name NAME and add it to the hash table
+   TABLE. */
+static SHELL_VAR *
+make_new_variable (name, table)
+     const char *name;
+     HASH_TABLE *table;
+{
+  SHELL_VAR *entry;
+  BUCKET_CONTENTS *elt;
+
+  entry = new_shell_variable (name);
+
+  /* Make sure we have a shell_variables hash table to add to. */
+  if (shell_variables == 0)
+    {
+      shell_variables = global_variables = new_var_context ((char *)NULL, 0);
+      shell_variables->scope = 0;
+      shell_variables->table = hash_create (0);
+    }
+
+  elt = hash_insert (savestring (name), table, HASH_NOSRCH);
+  elt->data = (PTR_T)entry;
+
+  return entry;
+}
+
+#if defined (ARRAY_VARS)
+SHELL_VAR *
+make_new_array_variable (name)
+     char *name;
+{
+  SHELL_VAR *entry;
+  ARRAY *array;
+
+  entry = make_new_variable (name, global_variables->table);
+  array = array_create ();
+  var_setarray (entry, array);
+  VSETATTR (entry, att_array);
+  return entry;
+}
+#endif
+
+char *
+make_variable_value (var, value, flags)
+     SHELL_VAR *var;
+     char *value;
+     int flags;
+{
+  char *retval, *oval;
+  intmax_t lval, rval;
+  int expok, olen;
+
+  /* If this variable has had its type set to integer (via `declare -i'),
+     then do expression evaluation on it and store the result.  The
+     functions in expr.c (evalexp()) and bind_int_variable() are responsible
+     for turning off the integer flag if they don't want further
+     evaluation done. */
+  if (integer_p (var))
+    {
+      if (flags & ASS_APPEND)
+	{
+	  oval = value_cell (var);
+	  lval = evalexp (oval, &expok);	/* ksh93 seems to do this */
+	  if (expok == 0)
+	    jump_to_top_level (DISCARD);
+	}
+      rval = evalexp (value, &expok);
+      if (expok == 0)
+	jump_to_top_level (DISCARD);
+      if (flags & ASS_APPEND)
+	rval += lval;
+      retval = itos (rval);
+    }
+  else if (value)
+    {
+      if (flags & ASS_APPEND)
+	{
+	  oval = get_variable_value (var);
+	  if (oval == 0)	/* paranoia */
+	    oval = "";
+	  olen = STRLEN (oval);
+	  retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1);
+	  strcpy (retval, oval);
+	  if (value)
+	    strcpy (retval+olen, value);
+	}
+      else if (*value)
+	retval = savestring (value);
+      else
+	{
+	  retval = (char *)xmalloc (1);
+	  retval[0] = '\0';
+	}
+    }
+  else
+    retval = (char *)NULL;
+
+  return retval;
+}
+
+/* Bind a variable NAME to VALUE in the HASH_TABLE TABLE, which may be the
+   temporary environment (but usually is not). */
+static SHELL_VAR *
+bind_variable_internal (name, value, table, hflags, aflags)
+     const char *name;
+     char *value;
+     HASH_TABLE *table;
+     int hflags, aflags;
+{
+  char *newval;
+  SHELL_VAR *entry;
+
+  entry = (hflags & HASH_NOSRCH) ? (SHELL_VAR *)NULL : hash_lookup (name, table);
+
+  if (entry == 0)
+    {
+      entry = make_new_variable (name, table);
+      var_setvalue (entry, make_variable_value (entry, value, 0)); /* XXX */
+    }
+  else if (entry->assign_func)	/* array vars have assign functions now */
+    {
+      INVALIDATE_EXPORTSTR (entry);
+      newval = (aflags & ASS_APPEND) ? make_variable_value (entry, value, aflags) : value;
+      entry = (*(entry->assign_func)) (entry, newval, -1);
+      if (newval != value)
+        free (newval);
+      return (entry);
+    }
+  else
+    {
+      if (readonly_p (entry) || noassign_p (entry))
+	{
+	  if (readonly_p (entry))
+	    err_readonly (name);
+	  return (entry);
+	}
+
+      /* Variables which are bound are visible. */
+      VUNSETATTR (entry, att_invisible);
+
+      newval = make_variable_value (entry, value, aflags);	/* XXX */
+
+      /* Invalidate any cached export string */
+      INVALIDATE_EXPORTSTR (entry);
+
+#if defined (ARRAY_VARS)
+      /* XXX -- this bears looking at again -- XXX */
+      /* If an existing array variable x is being assigned to with x=b or
+	 `read x' or something of that nature, silently convert it to
+	 x[0]=b or `read x[0]'. */
+      if (array_p (entry))
+	{
+	  array_insert (array_cell (entry), 0, newval);
+	  free (newval);
+	}
+      else
+#endif
+	{
+	  FREE (value_cell (entry));
+	  var_setvalue (entry, newval);
+	}
+    }
+
+  if (mark_modified_vars)
+    VSETATTR (entry, att_exported);
+
+  if (exported_p (entry))
+    array_needs_making = 1;
+
+  return (entry);
+}
+	
+/* Bind a variable NAME to VALUE.  This conses up the name
+   and value strings.  If we have a temporary environment, we bind there
+   first, then we bind into shell_variables. */
+
+SHELL_VAR *
+bind_variable (name, value, flags)
+     const char *name;
+     char *value;
+     int flags;
+{
+  SHELL_VAR *v;
+  VAR_CONTEXT *vc;
+
+  if (shell_variables == 0)
+    {
+      shell_variables = global_variables = new_var_context ((char *)NULL, 0);
+      shell_variables->scope = 0;
+      shell_variables->table = hash_create (0);
+    }
+
+  /* If we have a temporary environment, look there first for the variable,
+     and, if found, modify the value there before modifying it in the
+     shell_variables table.  This allows sourced scripts to modify values
+     given to them in a temporary environment while modifying the variable
+     value that the caller sees. */
+  if (temporary_env)
+    bind_tempenv_variable (name, value);
+
+  /* XXX -- handle local variables here. */
+  for (vc = shell_variables; vc; vc = vc->down)
+    {
+      if (vc_isfuncenv (vc) || vc_isbltnenv (vc))
+        {
+          v = hash_lookup (name, vc->table);
+          if (v)
+	    return (bind_variable_internal (name, value, vc->table, 0, flags));
+        }
+    }
+  return (bind_variable_internal (name, value, global_variables->table, 0, flags));
+}
+
+/* Make VAR, a simple shell variable, have value VALUE.  Once assigned a
+   value, variables are no longer invisible.  This is a duplicate of part
+   of the internals of bind_variable.  If the variable is exported, or
+   all modified variables should be exported, mark the variable for export
+   and note that the export environment needs to be recreated. */
+SHELL_VAR *
+bind_variable_value (var, value, aflags)
+     SHELL_VAR *var;
+     char *value;
+     int aflags;
+{
+  char *t;
+
+  VUNSETATTR (var, att_invisible);
+
+  if (var->assign_func)
+    {
+      /* If we're appending, we need the old value, so use
+	 make_variable_value */
+      t = (aflags & ASS_APPEND) ? make_variable_value (var, value, aflags) : value;
+      (*(var->assign_func)) (var, t, -1);
+      if (t != value && t)
+	free (t);      
+    }
+  else
+    {
+      t = make_variable_value (var, value, aflags);
+      FREE (value_cell (var));
+      var_setvalue (var, t);
+    }
+
+  INVALIDATE_EXPORTSTR (var);
+
+  if (mark_modified_vars)
+    VSETATTR (var, att_exported);
+
+  if (exported_p (var))
+    array_needs_making = 1;
+
+  return (var);
+}
+
+/* Bind/create a shell variable with the name LHS to the RHS.
+   This creates or modifies a variable such that it is an integer.
+
+   This used to be in expr.c, but it is here so that all of the
+   variable binding stuff is localized.  Since we don't want any
+   recursive evaluation from bind_variable() (possible without this code,
+   since bind_variable() calls the evaluator for variables with the integer
+   attribute set), we temporarily turn off the integer attribute for each
+   variable we set here, then turn it back on after binding as necessary. */
+
+SHELL_VAR *
+bind_int_variable (lhs, rhs)
+     char *lhs, *rhs;
+{
+  register SHELL_VAR *v;
+  char *t;
+  int isint, isarr;
+
+  isint = isarr = 0;
+#if defined (ARRAY_VARS)
+#  if 0
+  if (t = xstrchr (lhs, '['))	/*]*/
+#  else
+  if (valid_array_reference (lhs))
+#  endif
+    {
+      isarr = 1;
+      v = array_variable_part (lhs, (char **)0, (int *)0);
+    }
+  else
+#endif
+    v = find_variable (lhs);
+
+  if (v)
+    {
+      isint = integer_p (v);
+      VUNSETATTR (v, att_integer);
+    }
+
+#if defined (ARRAY_VARS)
+  if (isarr)
+    v = assign_array_element (lhs, rhs, 0);
+  else
+#endif
+    v = bind_variable (lhs, rhs, 0);
+
+  if (isint)
+    VSETATTR (v, att_integer);
+
+  return (v);
+}
+
+SHELL_VAR *
+bind_var_to_int (var, val)
+     char *var;
+     intmax_t val;
+{
+  char ibuf[INT_STRLEN_BOUND (intmax_t) + 1], *p;
+
+  p = fmtulong (val, 10, ibuf, sizeof (ibuf), 0);
+  return (bind_int_variable (var, p));
+}
+
+/* Do a function binding to a variable.  You pass the name and
+   the command to bind to.  This conses the name and command. */
+SHELL_VAR *
+bind_function (name, value)
+     const char *name;
+     COMMAND *value;
+{
+  SHELL_VAR *entry;
+
+  entry = find_function (name);
+  if (entry == 0)
+    {
+      BUCKET_CONTENTS *elt;
+
+      elt = hash_insert (savestring (name), shell_functions, HASH_NOSRCH);
+      entry = new_shell_variable (name);
+      elt->data = (PTR_T)entry;
+    }
+  else
+    INVALIDATE_EXPORTSTR (entry);
+
+  if (var_isset (entry))
+    dispose_command (function_cell (entry));
+
+  if (value)
+    var_setfunc (entry, copy_command (value));
+  else
+    var_setfunc (entry, 0);
+
+  VSETATTR (entry, att_function);
+
+  if (mark_modified_vars)
+    VSETATTR (entry, att_exported);
+
+  VUNSETATTR (entry, att_invisible);		/* Just to be sure */
+
+  if (exported_p (entry))
+    array_needs_making = 1;
+
+#if defined (PROGRAMMABLE_COMPLETION)
+  set_itemlist_dirty (&it_functions);
+#endif
+
+  return (entry);
+}
+
+/* Bind a function definition, which includes source file and line number
+   information in addition to the command, into the FUNCTION_DEF hash table.*/
+void
+bind_function_def (name, value)
+     const char *name;
+     FUNCTION_DEF *value;
+{
+  FUNCTION_DEF *entry;
+  BUCKET_CONTENTS *elt;
+  COMMAND *cmd;
+
+  entry = find_function_def (name);
+  if (entry)
+    {
+      dispose_function_def_contents (entry);
+      entry = copy_function_def_contents (value, entry);
+    }
+  else
+    {
+      cmd = value->command;
+      value->command = 0;
+      entry = copy_function_def (value);
+      value->command = cmd;
+
+      elt = hash_insert (savestring (name), shell_function_defs, HASH_NOSRCH);
+      elt->data = (PTR_T *)entry;
+    }
+}
+
+/* Add STRING, which is of the form foo=bar, to the temporary environment
+   HASH_TABLE (temporary_env).  The functions in execute_cmd.c are
+   responsible for moving the main temporary env to one of the other
+   temporary environments.  The expansion code in subst.c calls this. */
+int
+assign_in_env (word)
+     WORD_DESC *word;
+{
+  int offset;
+  char *name, *temp, *value;
+  SHELL_VAR *var;
+  const char *string;
+
+  string = word->word;
+
+  offset = assignment (string, 0);
+  name = savestring (string);
+  value = (char *)NULL;
+
+  if (name[offset] == '=')
+    {
+      name[offset] = 0;
+
+      /* ignore the `+' when assigning temporary environment */
+      if (name[offset - 1] == '+')
+	name[offset - 1] = '\0';
+
+      var = find_variable (name);
+      if (var && (readonly_p (var) || noassign_p (var)))
+	{
+	  if (readonly_p (var))
+	    err_readonly (name);
+	  free (name);
+  	  return (0);
+	}
+
+      temp = name + offset + 1;
+#if 0
+      temp = (xstrchr (temp, '~') != 0) ? bash_tilde_expand (temp, 1) : savestring (temp);
+      value = expand_string_unsplit_to_string (temp, 0);
+      free (temp);
+#else
+      value = expand_assignment_string_to_string (temp, 0);
+#endif
+    }
+
+  if (temporary_env == 0)
+    temporary_env = hash_create (TEMPENV_HASH_BUCKETS);
+
+  var = hash_lookup (name, temporary_env);
+  if (var == 0)
+    var = make_new_variable (name, temporary_env);
+  else
+    FREE (value_cell (var));
+
+  if (value == 0)
+    {
+      value = (char *)xmalloc (1);	/* like do_assignment_internal */
+      value[0] = '\0';
+    }
+
+  var_setvalue (var, value);
+  var->attributes |= (att_exported|att_tempvar);
+  var->context = variable_context;	/* XXX */
+
+  INVALIDATE_EXPORTSTR (var);
+  var->exportstr = mk_env_string (name, value);
+
+  array_needs_making = 1;
+
+  if (ifsname (name))
+    setifs (var);
+
+  if (echo_command_at_execute)
+    /* The Korn shell prints the `+ ' in front of assignment statements,
+	so we do too. */
+    xtrace_print_assignment (name, value, 0, 1);
+
+  free (name);
+  return 1;
+}
+
+/* **************************************************************** */
+/*								    */
+/*			Copying variables			    */
+/*								    */
+/* **************************************************************** */
+
+#ifdef INCLUDE_UNUSED
+/* Copy VAR to a new data structure and return that structure. */
+SHELL_VAR *
+copy_variable (var)
+     SHELL_VAR *var;
+{
+  SHELL_VAR *copy = (SHELL_VAR *)NULL;
+
+  if (var)
+    {
+      copy = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR));
+
+      copy->attributes = var->attributes;
+      copy->name = savestring (var->name);
+
+      if (function_p (var))
+	var_setfunc (copy, copy_command (function_cell (var)));
+#if defined (ARRAY_VARS)
+      else if (array_p (var))
+	var_setarray (copy, dup_array (array_cell (var)));
+#endif
+      else if (value_cell (var))
+	var_setvalue (copy, savestring (value_cell (var)));
+      else
+	var_setvalue (copy, (char *)NULL);
+
+      copy->dynamic_value = var->dynamic_value;
+      copy->assign_func = var->assign_func;
+
+      copy->exportstr = COPY_EXPORTSTR (var);
+
+      copy->context = var->context;
+    }
+  return (copy);
+}
+#endif
+
+/* **************************************************************** */
+/*								    */
+/*		  Deleting and unsetting variables		    */
+/*								    */
+/* **************************************************************** */
+
+/* Dispose of the information attached to VAR. */
+void
+dispose_variable (var)
+     SHELL_VAR *var;
+{
+  if (var == 0)
+    return;
+
+  if (function_p (var))
+    dispose_command (function_cell (var));
+#if defined (ARRAY_VARS)
+  else if (array_p (var))
+    array_dispose (array_cell (var));
+#endif
+  else
+    FREE (value_cell (var));
+
+  FREE_EXPORTSTR (var);
+
+  free (var->name);
+
+  if (exported_p (var))
+    array_needs_making = 1;
+
+  free (var);
+}
+
+/* Unset the shell variable referenced by NAME. */
+int
+unbind_variable (name)
+     const char *name;
+{
+  return makunbound (name, shell_variables);
+}
+
+/* Unset the shell function named NAME. */
+int
+unbind_func (name)
+     const char *name;
+{
+  BUCKET_CONTENTS *elt;
+  SHELL_VAR *func;
+
+  elt = hash_remove (name, shell_functions, 0);
+
+  if (elt == 0)
+    return -1;
+
+#if defined (PROGRAMMABLE_COMPLETION)
+  set_itemlist_dirty (&it_functions);
+#endif
+
+  func = (SHELL_VAR *)elt->data;
+  if (func)
+    {
+      if (exported_p (func))
+	array_needs_making++;
+      dispose_variable (func);
+    }
+
+  free (elt->key);
+  free (elt);
+
+  return 0;  
+}
+
+int
+unbind_function_def (name)
+     const char *name;
+{
+  BUCKET_CONTENTS *elt;
+  FUNCTION_DEF *funcdef;
+
+  elt = hash_remove (name, shell_function_defs, 0);
+
+  if (elt == 0)
+    return -1;
+
+  funcdef = (FUNCTION_DEF *)elt->data;
+  if (funcdef)
+    dispose_function_def (funcdef);
+
+  free (elt->key);
+  free (elt);
+
+  return 0;  
+}
+
+/* Make the variable associated with NAME go away.  HASH_LIST is the
+   hash table from which this variable should be deleted (either
+   shell_variables or shell_functions).
+   Returns non-zero if the variable couldn't be found. */
+int
+makunbound (name, vc)
+     const char *name;
+     VAR_CONTEXT *vc;
+{
+  BUCKET_CONTENTS *elt, *new_elt;
+  SHELL_VAR *old_var;
+  VAR_CONTEXT *v;
+  char *t;
+
+  for (elt = (BUCKET_CONTENTS *)NULL, v = vc; v; v = v->down)
+    if (elt = hash_remove (name, v->table, 0))
+      break;
+
+  if (elt == 0)
+    return (-1);
+
+  old_var = (SHELL_VAR *)elt->data;
+
+  if (old_var && exported_p (old_var))
+    array_needs_making++;
+
+  /* If we're unsetting a local variable and we're still executing inside
+     the function, just mark the variable as invisible.  The function
+     eventually called by pop_var_context() will clean it up later.  This
+     must be done so that if the variable is subsequently assigned a new
+     value inside the function, the `local' attribute is still present.
+     We also need to add it back into the correct hash table. */
+  if (old_var && local_p (old_var) && variable_context == old_var->context)
+    {
+#if defined (ARRAY_VARS)
+      if (array_p (old_var))
+	array_dispose (array_cell (old_var));
+      else
+#endif
+	FREE (value_cell (old_var));
+      /* Reset the attributes.  Preserve the export attribute if the variable
+         came from a temporary environment.  Make sure it stays local, and
+         make it invisible. */ 
+      old_var->attributes = (exported_p (old_var) && tempvar_p (old_var)) ? att_exported : 0;
+      VSETATTR (old_var, att_local);
+      VSETATTR (old_var, att_invisible);
+      var_setvalue (old_var, (char *)NULL);
+      INVALIDATE_EXPORTSTR (old_var);
+
+      new_elt = hash_insert (savestring (old_var->name), v->table, 0);
+      new_elt->data = (PTR_T)old_var;
+      stupidly_hack_special_variables (old_var->name);
+
+      free (elt->key);
+      free (elt);
+      return (0);
+    }
+
+  /* Have to save a copy of name here, because it might refer to
+     old_var->name.  If so, stupidly_hack_special_variables will
+     reference freed memory. */
+  t = savestring (name);
+
+  free (elt->key);
+  free (elt);
+
+  dispose_variable (old_var);
+  stupidly_hack_special_variables (t);
+  free (t);
+
+  return (0);
+}
+
+/* Get rid of all of the variables in the current context. */
+void
+kill_all_local_variables ()
+{
+  VAR_CONTEXT *vc;
+
+  for (vc = shell_variables; vc; vc = vc->down)
+    if (vc_isfuncenv (vc) && vc->scope == variable_context)
+      break;
+  if (vc == 0)
+    return;		/* XXX */
+
+  if (vc->table && vc_haslocals (vc))
+    {
+      delete_all_variables (vc->table);
+      hash_dispose (vc->table);
+    }
+  vc->table = (HASH_TABLE *)NULL;
+}
+
+static void
+free_variable_hash_data (data)
+     PTR_T data;
+{
+  SHELL_VAR *var;
+
+  var = (SHELL_VAR *)data;
+  dispose_variable (var);
+}
+
+/* Delete the entire contents of the hash table. */
+void
+delete_all_variables (hashed_vars)
+     HASH_TABLE *hashed_vars;
+{
+  hash_flush (hashed_vars, free_variable_hash_data);
+}
+
+/* **************************************************************** */
+/*								    */
+/*		     Setting variable attributes		    */
+/*								    */
+/* **************************************************************** */
+
+#define FIND_OR_MAKE_VARIABLE(name, entry) \
+  do \
+    { \
+      entry = find_variable (name); \
+      if (!entry) \
+	{ \
+	  entry = bind_variable (name, "", 0); \
+	  if (!no_invisible_vars) entry->attributes |= att_invisible; \
+	} \
+    } \
+  while (0)
+
+/* Make the variable associated with NAME be readonly.
+   If NAME does not exist yet, create it. */
+void
+set_var_read_only (name)
+     char *name;
+{
+  SHELL_VAR *entry;
+
+  FIND_OR_MAKE_VARIABLE (name, entry);
+  VSETATTR (entry, att_readonly);
+}
+
+#ifdef INCLUDE_UNUSED
+/* Make the function associated with NAME be readonly.
+   If NAME does not exist, we just punt, like auto_export code below. */
+void
+set_func_read_only (name)
+     const char *name;
+{
+  SHELL_VAR *entry;
+
+  entry = find_function (name);
+  if (entry)
+    VSETATTR (entry, att_readonly);
+}
+
+/* Make the variable associated with NAME be auto-exported.
+   If NAME does not exist yet, create it. */
+void
+set_var_auto_export (name)
+     char *name;
+{
+  SHELL_VAR *entry;
+
+  FIND_OR_MAKE_VARIABLE (name, entry);
+  set_auto_export (entry);
+}
+
+/* Make the function associated with NAME be auto-exported. */
+void
+set_func_auto_export (name)
+     const char *name;
+{
+  SHELL_VAR *entry;
+
+  entry = find_function (name);
+  if (entry)
+    set_auto_export (entry);
+}
+#endif
+
+/* **************************************************************** */
+/*								    */
+/*		     Creating lists of variables		    */
+/*								    */
+/* **************************************************************** */
+
+static VARLIST *
+vlist_alloc (nentries)
+     int nentries;
+{
+  VARLIST  *vlist;
+
+  vlist = (VARLIST *)xmalloc (sizeof (VARLIST));
+  vlist->list = (SHELL_VAR **)xmalloc ((nentries + 1) * sizeof (SHELL_VAR *));
+  vlist->list_size = nentries;
+  vlist->list_len = 0;
+  vlist->list[0] = (SHELL_VAR *)NULL;
+
+  return vlist;
+}
+
+static VARLIST *
+vlist_realloc (vlist, n)
+     VARLIST *vlist;
+     int n;
+{
+  if (vlist == 0)
+    return (vlist = vlist_alloc (n));
+  if (n > vlist->list_size)
+    {
+      vlist->list_size = n;
+      vlist->list = (SHELL_VAR **)xrealloc (vlist->list, (vlist->list_size + 1) * sizeof (SHELL_VAR *));
+    }
+  return vlist;
+}
+
+static void
+vlist_add (vlist, var, flags)
+     VARLIST *vlist;
+     SHELL_VAR *var;
+     int flags;
+{
+  register int i;
+
+  for (i = 0; i < vlist->list_len; i++)
+    if (STREQ (var->name, vlist->list[i]->name))
+      break;
+  if (i < vlist->list_len)
+    return;
+
+  if (i >= vlist->list_size)
+    vlist = vlist_realloc (vlist, vlist->list_size + 16);
+
+  vlist->list[vlist->list_len++] = var;
+  vlist->list[vlist->list_len] = (SHELL_VAR *)NULL;
+}
+
+/* Map FUNCTION over the variables in VAR_HASH_TABLE.  Return an array of the
+   variables for which FUNCTION returns a non-zero value.  A NULL value
+   for FUNCTION means to use all variables. */
+SHELL_VAR **
+map_over (function, vc)
+     sh_var_map_func_t *function;
+     VAR_CONTEXT *vc;
+{
+  VAR_CONTEXT *v;
+  VARLIST *vlist;
+  SHELL_VAR **ret;
+  int nentries;
+
+  for (nentries = 0, v = vc; v; v = v->down)
+    nentries += HASH_ENTRIES (v->table);
+
+  if (nentries == 0)
+    return (SHELL_VAR **)NULL;
+
+  vlist = vlist_alloc (nentries);
+
+  for (v = vc; v; v = v->down)
+    flatten (v->table, function, vlist, 0);
+
+  ret = vlist->list;
+  free (vlist);
+  return ret;
+}
+
+SHELL_VAR **
+map_over_funcs (function)
+     sh_var_map_func_t *function;
+{
+  VARLIST *vlist;
+  SHELL_VAR **ret;
+
+  if (shell_functions == 0 || HASH_ENTRIES (shell_functions) == 0)
+    return ((SHELL_VAR **)NULL);
+
+  vlist = vlist_alloc (HASH_ENTRIES (shell_functions));
+
+  flatten (shell_functions, function, vlist, 0);
+
+  ret = vlist->list;
+  free (vlist);
+  return ret;
+}
+
+/* Flatten VAR_HASH_TABLE, applying FUNC to each member and adding those
+   elements for which FUNC succeeds to VLIST->list.  FLAGS is reserved
+   for future use.  Only unique names are added to VLIST.  If FUNC is
+   NULL, each variable in VAR_HASH_TABLE is added to VLIST.  If VLIST is
+   NULL, FUNC is applied to each SHELL_VAR in VAR_HASH_TABLE.  If VLIST
+   and FUNC are both NULL, nothing happens. */
+static void
+flatten (var_hash_table, func, vlist, flags)
+     HASH_TABLE *var_hash_table;
+     sh_var_map_func_t *func;
+     VARLIST *vlist;
+     int flags;
+{
+  register int i;
+  register BUCKET_CONTENTS *tlist;
+  int r;
+  SHELL_VAR *var;
+
+  if (var_hash_table == 0 || (HASH_ENTRIES (var_hash_table) == 0) || (vlist == 0 && func == 0))
+    return;
+
+  for (i = 0; i < var_hash_table->nbuckets; i++)
+    {
+      for (tlist = hash_items (i, var_hash_table); tlist; tlist = tlist->next)
+	{
+	  var = (SHELL_VAR *)tlist->data;
+
+	  r = func ? (*func) (var) : 1;
+	  if (r && vlist)
+	    vlist_add (vlist, var, flags);
+	}
+    }
+}
+
+void
+sort_variables (array)
+     SHELL_VAR **array;
+{
+  qsort (array, strvec_len ((char **)array), sizeof (SHELL_VAR *), (QSFUNC *)qsort_var_comp);
+}
+
+static int
+qsort_var_comp (var1, var2)
+     SHELL_VAR **var1, **var2;
+{
+  int result;
+
+  if ((result = (*var1)->name[0] - (*var2)->name[0]) == 0)
+    result = strcmp ((*var1)->name, (*var2)->name);
+
+  return (result);
+}
+
+/* Apply FUNC to each variable in SHELL_VARIABLES, adding each one for
+   which FUNC succeeds to an array of SHELL_VAR *s.  Returns the array. */
+static SHELL_VAR **
+vapply (func)
+     sh_var_map_func_t *func;
+{
+  SHELL_VAR **list;
+
+  list = map_over (func, shell_variables);
+  if (list /* && posixly_correct */)
+    sort_variables (list);
+  return (list);
+}
+
+/* Apply FUNC to each variable in SHELL_FUNCTIONS, adding each one for
+   which FUNC succeeds to an array of SHELL_VAR *s.  Returns the array. */
+static SHELL_VAR **
+fapply (func)
+     sh_var_map_func_t *func;
+{
+  SHELL_VAR **list;
+
+  list = map_over_funcs (func);
+  if (list /* && posixly_correct */)
+    sort_variables (list);
+  return (list);
+}
+
+/* Create a NULL terminated array of all the shell variables. */
+SHELL_VAR **
+all_shell_variables ()
+{
+  return (vapply ((sh_var_map_func_t *)NULL));
+}
+
+/* Create a NULL terminated array of all the shell functions. */
+SHELL_VAR **
+all_shell_functions ()
+{
+  return (fapply ((sh_var_map_func_t *)NULL));
+}
+
+static int
+visible_var (var)
+     SHELL_VAR *var;
+{
+  return (invisible_p (var) == 0);
+}
+
+SHELL_VAR **
+all_visible_functions ()
+{
+  return (fapply (visible_var));
+}
+
+SHELL_VAR **
+all_visible_variables ()
+{
+  return (vapply (visible_var));
+}
+
+/* Return non-zero if the variable VAR is visible and exported.  Array
+   variables cannot be exported. */
+static int
+visible_and_exported (var)
+     SHELL_VAR *var;
+{
+  return (invisible_p (var) == 0 && exported_p (var));
+}
+
+/* Return non-zero if VAR is a local variable in the current context and
+   is exported. */
+static int
+local_and_exported (var)
+     SHELL_VAR *var;
+{
+  return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context && exported_p (var));
+}
+
+SHELL_VAR **
+all_exported_variables ()
+{
+  return (vapply (visible_and_exported));
+}
+
+SHELL_VAR **
+local_exported_variables ()
+{
+  return (vapply (local_and_exported));
+}
+
+static int
+variable_in_context (var)
+     SHELL_VAR *var;
+{
+  return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context);
+}
+
+SHELL_VAR **
+all_local_variables ()
+{
+  VARLIST *vlist;
+  SHELL_VAR **ret;
+  VAR_CONTEXT *vc;
+
+  vc = shell_variables;
+  for (vc = shell_variables; vc; vc = vc->down)
+    if (vc_isfuncenv (vc) && vc->scope == variable_context)
+      break;
+
+  if (vc == 0)
+    {
+      internal_error (_("all_local_variables: no function context at current scope"));
+      return (SHELL_VAR **)NULL;
+    }
+  if (vc->table == 0 || HASH_ENTRIES (vc->table) == 0 || vc_haslocals (vc) == 0)
+    return (SHELL_VAR **)NULL;
+    
+  vlist = vlist_alloc (HASH_ENTRIES (vc->table));
+
+  flatten (vc->table, variable_in_context, vlist, 0);
+
+  ret = vlist->list;
+  free (vlist);
+  if (ret)
+    sort_variables (ret);
+  return ret;
+}
+
+#if defined (ARRAY_VARS)
+/* Return non-zero if the variable VAR is visible and an array. */
+static int
+visible_array_vars (var)
+     SHELL_VAR *var;
+{
+  return (invisible_p (var) == 0 && array_p (var));
+}
+
+SHELL_VAR **
+all_array_variables ()
+{
+  return (vapply (visible_array_vars));
+}
+#endif /* ARRAY_VARS */
+
+char **
+all_variables_matching_prefix (prefix)
+     const char *prefix;
+{
+  SHELL_VAR **varlist;
+  char **rlist;
+  int vind, rind, plen;
+
+  plen = STRLEN (prefix);
+  varlist = all_visible_variables ();
+  for (vind = 0; varlist && varlist[vind]; vind++)
+    ;
+  if (varlist == 0 || vind == 0)
+    return ((char **)NULL);
+  rlist = strvec_create (vind + 1);
+  for (vind = rind = 0; varlist[vind]; vind++)
+    {
+      if (plen == 0 || STREQN (prefix, varlist[vind]->name, plen))
+	rlist[rind++] = savestring (varlist[vind]->name);
+    }
+  rlist[rind] = (char *)0;
+  free (varlist);
+
+  return rlist;
+}
+
+/* **************************************************************** */
+/*								    */
+/*		 Managing temporary variable scopes		    */
+/*								    */
+/* **************************************************************** */
+
+/* Make variable NAME have VALUE in the temporary environment. */
+static SHELL_VAR *
+bind_tempenv_variable (name, value)
+     const char *name;
+     char *value;
+{
+  SHELL_VAR *var;
+
+  var = temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL;
+
+  if (var)
+    {
+      FREE (value_cell (var));
+      var_setvalue (var, savestring (value));
+      INVALIDATE_EXPORTSTR (var);
+    }
+
+  return (var);
+}
+
+/* Find a variable in the temporary environment that is named NAME.
+   Return the SHELL_VAR *, or NULL if not found. */
+SHELL_VAR *
+find_tempenv_variable (name)
+     const char *name;
+{
+  return (temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL);
+}
+
+/* Push the variable described by (SHELL_VAR *)DATA down to the next
+   variable context from the temporary environment. */
+static void
+push_temp_var (data)
+     PTR_T data;
+{
+  SHELL_VAR *var, *v;
+  HASH_TABLE *binding_table;
+
+  var = (SHELL_VAR *)data;
+
+  binding_table = shell_variables->table;
+  if (binding_table == 0)
+    {
+      if (shell_variables == global_variables)
+	/* shouldn't happen */
+	binding_table = shell_variables->table = global_variables->table = hash_create (0);
+      else
+	binding_table = shell_variables->table = hash_create (TEMPENV_HASH_BUCKETS);
+    }
+
+  v = bind_variable_internal (var->name, value_cell (var), binding_table, 0, 0);
+
+  /* XXX - should we set the context here?  It shouldn't matter because of how
+     assign_in_env works, but might want to check. */
+  if (binding_table == global_variables->table)		/* XXX */
+    var->attributes &= ~(att_tempvar|att_propagate);
+  else
+    {
+      var->attributes |= att_propagate;
+      if  (binding_table == shell_variables->table)
+	shell_variables->flags |= VC_HASTMPVAR;
+    }
+  v->attributes |= var->attributes;
+
+  dispose_variable (var);
+}
+
+static void
+propagate_temp_var (data)
+     PTR_T data;
+{
+  SHELL_VAR *var;
+
+  var = (SHELL_VAR *)data;
+  if (tempvar_p (var) && (var->attributes & att_propagate))
+    push_temp_var (data);
+  else
+    dispose_variable (var);
+}
+
+/* Free the storage used in the hash table for temporary
+   environment variables.  PUSHF is a function to be called
+   to free each hash table entry.  It takes care of pushing variables
+   to previous scopes if appropriate. */
+static void
+dispose_temporary_env (pushf)
+     sh_free_func_t *pushf;
+{
+  hash_flush (temporary_env, pushf);
+  hash_dispose (temporary_env);
+  temporary_env  = (HASH_TABLE *)NULL;
+
+  array_needs_making = 1;
+
+  sv_ifs ("IFS");		/* XXX here for now */
+}
+
+void
+dispose_used_env_vars ()
+{
+  if (temporary_env)
+    dispose_temporary_env (propagate_temp_var);
+}
+
+/* Take all of the shell variables in the temporary environment HASH_TABLE
+   and make shell variables from them at the current variable context. */
+void
+merge_temporary_env ()
+{
+  if (temporary_env)
+    dispose_temporary_env (push_temp_var);
+}
+
+/* **************************************************************** */
+/*								    */
+/*	     Creating and manipulating the environment		    */
+/*								    */
+/* **************************************************************** */
+
+static inline char *
+mk_env_string (name, value)
+     const char *name, *value;
+{
+  int name_len, value_len;
+  char	*p;
+
+  name_len = strlen (name);
+  value_len = STRLEN (value);
+  p = (char *)xmalloc (2 + name_len + value_len);
+  strcpy (p, name);
+  p[name_len] = '=';
+  if (value && *value)
+    strcpy (p + name_len + 1, value);
+  else
+    p[name_len + 1] = '\0';
+  return (p);
+}
+
+#ifdef DEBUG
+/* Debugging */
+static int
+valid_exportstr (v)
+     SHELL_VAR *v;
+{
+  char *s;
+
+  s = v->exportstr;
+  if (legal_variable_starter ((unsigned char)*s) == 0)
+    {
+      internal_error (_("invalid character %d in exportstr for %s"), *s, v->name);
+      return (0);
+    }
+  for (s = v->exportstr + 1; s && *s; s++)
+    {
+      if (*s == '=')
+	break;
+      if (legal_variable_char ((unsigned char)*s) == 0)
+	{
+	  internal_error (_("invalid character %d in exportstr for %s"), *s, v->name);
+	  return (0);
+	}
+    }
+  if (*s != '=')
+    {
+      internal_error (_("no `=' in exportstr for %s"), v->name);
+      return (0);
+    }
+  return (1);
+}
+#endif
+
+static char **
+make_env_array_from_var_list (vars)
+     SHELL_VAR **vars;
+{
+  register int i, list_index;
+  register SHELL_VAR *var;
+  char **list, *value;
+
+  list = strvec_create ((1 + strvec_len ((char **)vars)));
+
+#define USE_EXPORTSTR (value == var->exportstr)
+
+  for (i = 0, list_index = 0; var = vars[i]; i++)
+    {
+#if defined (__CYGWIN__)
+      /* We don't use the exportstr stuff on Cygwin at all. */
+      INVALIDATE_EXPORTSTR (var);
+#endif
+      if (var->exportstr)
+	value = var->exportstr;
+      else if (function_p (var))
+	value = named_function_string ((char *)NULL, function_cell (var), 0);
+#if defined (ARRAY_VARS)
+      else if (array_p (var))
+#  if 0
+	value = array_to_assignment_string (array_cell (var));
+#  else
+	continue;	/* XXX array vars cannot yet be exported */
+#  endif
+#endif
+      else
+	value = value_cell (var);
+
+      if (value)
+	{
+	  /* Gee, I'd like to get away with not using savestring() if we're
+	     using the cached exportstr... */
+	  list[list_index] = USE_EXPORTSTR ? savestring (value)
+					   : mk_env_string (var->name, value);
+
+	  if (USE_EXPORTSTR == 0)
+	    SAVE_EXPORTSTR (var, list[list_index]);
+
+	  list_index++;
+#undef USE_EXPORTSTR
+
+#if 0	/* not yet */
+#if defined (ARRAY_VARS)
+	  if (array_p (var))
+	    free (value);
+#endif
+#endif
+	}
+    }
+
+  list[list_index] = (char *)NULL;
+  return (list);
+}
+
+/* Make an array of assignment statements from the hash table
+   HASHED_VARS which contains SHELL_VARs.  Only visible, exported
+   variables are eligible. */
+static char **
+make_var_export_array (vcxt)
+     VAR_CONTEXT *vcxt;
+{
+  char **list;
+  SHELL_VAR **vars;
+
+  vars = map_over (visible_and_exported, vcxt);
+
+  if (vars == 0)
+    return (char **)NULL;
+
+  list = make_env_array_from_var_list (vars);
+
+  free (vars);
+  return (list);
+}
+
+static char **
+make_func_export_array ()
+{
+  char **list;
+  SHELL_VAR **vars;
+
+  vars = map_over_funcs (visible_and_exported);
+  if (vars == 0)
+    return (char **)NULL;
+
+  list = make_env_array_from_var_list (vars);
+
+  free (vars);
+  return (list);
+}
+
+/* Add ENVSTR to the end of the exported environment, EXPORT_ENV. */
+#define add_to_export_env(envstr,do_alloc) \
+do \
+  { \
+    if (export_env_index >= (export_env_size - 1)) \
+      { \
+	export_env_size += 16; \
+	export_env = strvec_resize (export_env, export_env_size); \
+	environ = export_env; \
+      } \
+    export_env[export_env_index++] = (do_alloc) ? savestring (envstr) : envstr; \
+    export_env[export_env_index] = (char *)NULL; \
+  } while (0)
+
+/* Add ASSIGN to EXPORT_ENV, or supercede a previous assignment in the
+   array with the same left-hand side.  Return the new EXPORT_ENV. */
+char **
+add_or_supercede_exported_var (assign, do_alloc)
+     char *assign;
+     int do_alloc;
+{
+  register int i;
+  int equal_offset;
+
+  equal_offset = assignment (assign, 0);
+  if (equal_offset == 0)
+    return (export_env);
+
+  /* If this is a function, then only supersede the function definition.
+     We do this by including the `=() {' in the comparison, like
+     initialize_shell_variables does. */
+  if (assign[equal_offset + 1] == '(' &&
+     strncmp (assign + equal_offset + 2, ") {", 3) == 0)		/* } */
+    equal_offset += 4;
+
+  for (i = 0; i < export_env_index; i++)
+    {
+      if (STREQN (assign, export_env[i], equal_offset + 1))
+	{
+	  free (export_env[i]);
+	  export_env[i] = do_alloc ? savestring (assign) : assign;
+	  return (export_env);
+	}
+    }
+  add_to_export_env (assign, do_alloc);
+  return (export_env);
+}
+
+static void
+add_temp_array_to_env (temp_array, do_alloc, do_supercede)
+     char **temp_array;
+     int do_alloc, do_supercede;
+{
+  register int i;
+
+  if (temp_array == 0)
+    return;
+
+  for (i = 0; temp_array[i]; i++)
+    {
+      if (do_supercede)
+	export_env = add_or_supercede_exported_var (temp_array[i], do_alloc);
+      else
+	add_to_export_env (temp_array[i], do_alloc);
+    }
+
+  free (temp_array);
+}
+
+/* Make the environment array for the command about to be executed, if the
+   array needs making.  Otherwise, do nothing.  If a shell action could
+   change the array that commands receive for their environment, then the
+   code should `array_needs_making++'.
+
+   The order to add to the array is:
+   	temporary_env
+   	list of var contexts whose head is shell_variables
+  	shell_functions
+
+  This is the shell variable lookup order.  We add only new variable
+  names at each step, which allows local variables and variables in
+  the temporary environments to shadow variables in the global (or
+  any previous) scope.
+*/
+
+static int
+n_shell_variables ()
+{
+  VAR_CONTEXT *vc;
+  int n;
+
+  for (n = 0, vc = shell_variables; vc; vc = vc->down)
+    n += HASH_ENTRIES (vc->table);
+  return n;
+}
+
+void
+maybe_make_export_env ()
+{
+  register char **temp_array;
+  int new_size;
+  VAR_CONTEXT *tcxt;
+
+  if (array_needs_making)
+    {
+      if (export_env)
+        strvec_flush (export_env);
+
+      /* Make a guess based on how many shell variables and functions we
+	 have.  Since there will always be array variables, and array
+	 variables are not (yet) exported, this will always be big enough
+	 for the exported variables and functions. */
+      new_size = n_shell_variables () + HASH_ENTRIES (shell_functions) + 1 +
+		 HASH_ENTRIES (temporary_env);
+      if (new_size > export_env_size)
+	{
+	  export_env_size = new_size;
+	  export_env = strvec_resize (export_env, export_env_size);
+	  environ = export_env;
+	}
+      export_env[export_env_index = 0] = (char *)NULL;
+
+      /* Make a dummy variable context from the  temporary_env, stick it on
+         the front of shell_variables, call make_var_export_array on the
+         whole thing to flatten it, and convert the list of SHELL_VAR *s
+         to the form needed by the environment. */
+      if (temporary_env)
+        {
+          tcxt = new_var_context ((char *)NULL, 0);
+          tcxt->table = temporary_env;
+          tcxt->down = shell_variables;
+        }
+      else
+        tcxt = shell_variables;
+      
+      temp_array = make_var_export_array (tcxt);
+      if (temp_array)
+	add_temp_array_to_env (temp_array, 0, 0);
+
+      if (tcxt != shell_variables)
+        free (tcxt);
+
+#if defined (RESTRICTED_SHELL)
+      /* Restricted shells may not export shell functions. */
+      temp_array = restricted ? (char **)0 : make_func_export_array ();
+#else
+      temp_array = make_func_export_array ();
+#endif
+      if (temp_array)
+	add_temp_array_to_env (temp_array, 0, 0);
+
+      array_needs_making = 0;
+    }
+}
+
+/* This is an efficiency hack.  PWD and OLDPWD are auto-exported, so
+   we will need to remake the exported environment every time we
+   change directories.  `_' is always put into the environment for
+   every external command, so without special treatment it will always
+   cause the environment to be remade.
+
+   If there is no other reason to make the exported environment, we can
+   just update the variables in place and mark the exported environment
+   as no longer needing a remake. */
+void
+update_export_env_inplace (env_prefix, preflen, value)
+     char *env_prefix;
+     int preflen;
+     char *value;
+{
+  char *evar;
+
+  evar = (char *)xmalloc (STRLEN (value) + preflen + 1);
+  strcpy (evar, env_prefix);
+  if (value)
+    strcpy (evar + preflen, value);
+  export_env = add_or_supercede_exported_var (evar, 0);
+}
+
+/* We always put _ in the environment as the name of this command. */
+void
+put_command_name_into_env (command_name)
+     char *command_name;
+{
+  update_export_env_inplace ("_=", 2, command_name);
+}
+
+#if 0	/* UNUSED -- it caused too many problems */
+void
+put_gnu_argv_flags_into_env (pid, flags_string)
+     intmax_t pid;
+     char *flags_string;
+{
+  char *dummy, *pbuf;
+  int l, fl;
+
+  pbuf = itos (pid);
+  l = strlen (pbuf);
+
+  fl = strlen (flags_string);
+
+  dummy = (char *)xmalloc (l + fl + 30);
+  dummy[0] = '_';
+  strcpy (dummy + 1, pbuf);
+  strcpy (dummy + 1 + l, "_GNU_nonoption_argv_flags_");
+  dummy[l + 27] = '=';
+  strcpy (dummy + l + 28, flags_string);
+
+  free (pbuf);
+
+  export_env = add_or_supercede_exported_var (dummy, 0);
+}
+#endif
+
+/* **************************************************************** */
+/*								    */
+/*		      Managing variable contexts		    */
+/*								    */
+/* **************************************************************** */
+
+/* Allocate and return a new variable context with NAME and FLAGS.
+   NAME can be NULL. */
+
+VAR_CONTEXT *
+new_var_context (name, flags)
+     char *name;
+     int flags;
+{
+  VAR_CONTEXT *vc;
+
+  vc = (VAR_CONTEXT *)xmalloc (sizeof (VAR_CONTEXT));
+  vc->name = name ? savestring (name) : (char *)NULL;
+  vc->scope = variable_context;
+  vc->flags = flags;
+
+  vc->up = vc->down = (VAR_CONTEXT *)NULL;
+  vc->table = (HASH_TABLE *)NULL;
+
+  return vc;
+}
+
+/* Free a variable context and its data, including the hash table.  Dispose
+   all of the variables. */
+void
+dispose_var_context (vc)
+     VAR_CONTEXT *vc;
+{
+  FREE (vc->name);
+
+  if (vc->table)
+    {
+      delete_all_variables (vc->table);
+      hash_dispose (vc->table);
+    }
+
+  free (vc);
+}
+
+/* Set VAR's scope level to the current variable context. */
+static int
+set_context (var)
+     SHELL_VAR *var;
+{
+  return (var->context = variable_context);
+}
+
+/* Make a new variable context with NAME and FLAGS and a HASH_TABLE of
+   temporary variables, and push it onto shell_variables.  This is
+   for shell functions. */
+VAR_CONTEXT *
+push_var_context (name, flags, tempvars)
+     char *name;
+     int flags;
+     HASH_TABLE *tempvars;
+{
+  VAR_CONTEXT *vc;
+
+  vc = new_var_context (name, flags);
+  vc->table = tempvars;
+  if (tempvars)
+    {
+      /* Have to do this because the temp environment was created before
+	 variable_context was incremented. */
+      flatten (tempvars, set_context, (VARLIST *)NULL, 0);
+      vc->flags |= VC_HASTMPVAR;
+    }
+  vc->down = shell_variables;
+  shell_variables->up = vc;
+
+  return (shell_variables = vc);
+}
+
+static void
+push_func_var (data)
+     PTR_T data;
+{
+  SHELL_VAR *var, *v;
+
+  var = (SHELL_VAR *)data;
+
+  if (tempvar_p (var) && (posixly_correct || (var->attributes & att_propagate)))
+    {
+      /* XXX - should we set v->context here? */
+      v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0);
+      if (shell_variables == global_variables)
+	var->attributes &= ~(att_tempvar|att_propagate);
+      else
+        shell_variables->flags |= VC_HASTMPVAR;
+      v->attributes |= var->attributes;
+    }
+
+  dispose_variable (var);
+}
+
+/* Pop the top context off of VCXT and dispose of it, returning the rest of
+   the stack. */
+void
+pop_var_context ()
+{
+  VAR_CONTEXT *ret, *vcxt;
+
+  vcxt = shell_variables;
+  if (vc_isfuncenv (vcxt) == 0)
+    {
+      internal_error (_("pop_var_context: head of shell_variables not a function context"));
+      return;
+    }
+
+  if (ret = vcxt->down)
+    {
+      ret->up = (VAR_CONTEXT *)NULL;
+      shell_variables = ret;
+      if (vcxt->table)
+	hash_flush (vcxt->table, push_func_var);
+      dispose_var_context (vcxt);
+    }
+  else
+    internal_error (_("pop_var_context: no global_variables context"));
+}
+
+/* Delete the HASH_TABLEs for all variable contexts beginning at VCXT, and
+   all of the VAR_CONTEXTs except GLOBAL_VARIABLES. */
+void
+delete_all_contexts (vcxt)
+     VAR_CONTEXT *vcxt;
+{
+  VAR_CONTEXT *v, *t;
+
+  for (v = vcxt; v != global_variables; v = t)
+    {
+      t = v->down;
+      dispose_var_context (v);
+    }            
+
+  delete_all_variables (global_variables->table);
+  shell_variables = global_variables;
+}
+
+/* **************************************************************** */
+/*								    */
+/*	   Pushing and Popping temporary variable scopes	    */
+/*								    */
+/* **************************************************************** */
+
+VAR_CONTEXT *
+push_scope (flags, tmpvars)
+     int flags;
+     HASH_TABLE *tmpvars;
+{
+  return (push_var_context ((char *)NULL, flags, tmpvars));
+}
+
+static void
+push_exported_var (data)
+     PTR_T data;
+{
+  SHELL_VAR *var, *v;
+
+  var = (SHELL_VAR *)data;
+
+  /* If a temp var had its export attribute set, or it's marked to be
+     propagated, bind it in the previous scope before disposing it. */
+  /* XXX - This isn't exactly right, because all tempenv variables have the
+    export attribute set. */
+#if 0
+  if (exported_p (var) || (var->attributes & att_propagate))
+#else
+  if (tempvar_p (var) && exported_p (var) && (var->attributes & att_propagate))
+#endif
+    {
+      var->attributes &= ~att_tempvar;		/* XXX */
+      v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0);
+      if (shell_variables == global_variables)
+	var->attributes &= ~att_propagate;
+      v->attributes |= var->attributes;
+    }
+
+  dispose_variable (var);
+}
+
+void
+pop_scope (is_special)
+     int is_special;
+{
+  VAR_CONTEXT *vcxt, *ret;
+
+  vcxt = shell_variables;
+  if (vc_istempscope (vcxt) == 0)
+    {
+      internal_error (_("pop_scope: head of shell_variables not a temporary environment scope"));
+      return;
+    }
+
+  ret = vcxt->down;
+  if (ret)
+    ret->up = (VAR_CONTEXT *)NULL;
+
+  shell_variables = ret;
+
+  /* Now we can take care of merging variables in VCXT into set of scopes
+     whose head is RET (shell_variables). */
+  FREE (vcxt->name);
+  if (vcxt->table)
+    {
+      if (is_special)
+	hash_flush (vcxt->table, push_func_var);
+      else
+	hash_flush (vcxt->table, push_exported_var);
+      hash_dispose (vcxt->table);
+    }
+  free (vcxt);
+
+  sv_ifs ("IFS");	/* XXX here for now */
+}
+
+/* **************************************************************** */
+/*								    */
+/*		 Pushing and Popping function contexts		    */
+/*								    */
+/* **************************************************************** */
+
+static WORD_LIST **dollar_arg_stack = (WORD_LIST **)NULL;
+static int dollar_arg_stack_slots;
+static int dollar_arg_stack_index;
+
+/* XXX - we might want to consider pushing and popping the `getopts' state
+   when we modify the positional parameters. */
+void
+push_context (name, is_subshell, tempvars)
+     char *name;	/* function name */
+     int is_subshell;
+     HASH_TABLE *tempvars;
+{
+  if (is_subshell == 0)
+    push_dollar_vars ();
+  variable_context++;
+  push_var_context (name, VC_FUNCENV, tempvars);
+}
+
+/* Only called when subshell == 0, so we don't need to check, and can
+   unconditionally pop the dollar vars off the stack. */
+void
+pop_context ()
+{
+  pop_dollar_vars ();
+  variable_context--;
+  pop_var_context ();
+
+  sv_ifs ("IFS");		/* XXX here for now */
+}
+
+/* Save the existing positional parameters on a stack. */
+void
+push_dollar_vars ()
+{
+  if (dollar_arg_stack_index + 2 > dollar_arg_stack_slots)
+    {
+      dollar_arg_stack = (WORD_LIST **)
+	xrealloc (dollar_arg_stack, (dollar_arg_stack_slots += 10)
+		  * sizeof (WORD_LIST **));
+    }
+  dollar_arg_stack[dollar_arg_stack_index++] = list_rest_of_args ();
+  dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
+}
+
+/* Restore the positional parameters from our stack. */
+void
+pop_dollar_vars ()
+{
+  if (!dollar_arg_stack || dollar_arg_stack_index == 0)
+    return;
+
+  remember_args (dollar_arg_stack[--dollar_arg_stack_index], 1);
+  dispose_words (dollar_arg_stack[dollar_arg_stack_index]);
+  dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
+  set_dollar_vars_unchanged ();
+}
+
+void
+dispose_saved_dollar_vars ()
+{
+  if (!dollar_arg_stack || dollar_arg_stack_index == 0)
+    return;
+
+  dispose_words (dollar_arg_stack[dollar_arg_stack_index]);
+  dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
+}
+
+/* Manipulate the special BASH_ARGV and BASH_ARGC variables. */
+
+void
+push_args (list)
+     WORD_LIST *list;
+{
+#if defined (ARRAY_VARS) && defined (DEBUGGER)
+  SHELL_VAR *bash_argv_v, *bash_argc_v;
+  ARRAY *bash_argv_a, *bash_argc_a;
+  WORD_LIST *l;
+  arrayind_t i;
+  char *t;
+
+  GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
+  GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
+
+  for (l = list, i = 0; l; l = l->next, i++)
+    array_push (bash_argv_a, l->word->word);
+
+  t = itos (i);
+  array_push (bash_argc_a, t);
+  free (t);
+#endif /* ARRAY_VARS && DEBUGGER */
+}
+
+/* Remove arguments from BASH_ARGV array.  Pop top element off BASH_ARGC
+   array and use that value as the count of elements to remove from
+   BASH_ARGV. */
+void
+pop_args ()
+{
+#if defined (ARRAY_VARS) && defined (DEBUGGER)
+  SHELL_VAR *bash_argv_v, *bash_argc_v;
+  ARRAY *bash_argv_a, *bash_argc_a;
+  ARRAY_ELEMENT *ce;
+  intmax_t i;
+
+  GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
+  GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
+
+  ce = array_shift (bash_argc_a, 1, 0);
+  if (ce == 0 || legal_number (element_value (ce), &i) == 0)
+    i = 0;
+
+  for ( ; i > 0; i--)
+    array_pop (bash_argv_a);
+  array_dispose_element (ce);
+#endif /* ARRAY_VARS && DEBUGGER */
+}
+
+/*************************************************
+ *						 *
+ *	Functions to manage special variables	 *
+ *						 *
+ *************************************************/
+
+/* Extern declarations for variables this code has to manage. */
+extern int eof_encountered, eof_encountered_limit, ignoreeof;
+
+#if defined (READLINE)
+extern int hostname_list_initialized;
+#endif
+
+/* An alist of name.function for each special variable.  Most of the
+   functions don't do much, and in fact, this would be faster with a
+   switch statement, but by the end of this file, I am sick of switch
+   statements. */
+
+#define SET_INT_VAR(name, intvar)  intvar = find_variable (name) != 0
+
+/* This table will be sorted with qsort() the first time it's accessed. */
+struct name_and_function {
+  char *name;
+  sh_sv_func_t *function;
+};
+
+static struct name_and_function special_vars[] = {
+#if defined (READLINE)
+#  if defined (STRICT_POSIX)
+  { "COLUMNS", sv_winsize },
+#  endif
+  { "COMP_WORDBREAKS", sv_comp_wordbreaks },
+#endif
+
+  { "GLOBIGNORE", sv_globignore },
+
+#if defined (HISTORY)
+  { "HISTCONTROL", sv_history_control },
+  { "HISTFILESIZE", sv_histsize },
+  { "HISTIGNORE", sv_histignore },
+  { "HISTSIZE", sv_histsize },
+  { "HISTTIMEFORMAT", sv_histtimefmt },
+#endif
+
+#if defined (__CYGWIN__)
+  { "HOME", sv_home },
+#endif
+
+#if defined (READLINE)
+  { "HOSTFILE", sv_hostfile },
+#endif
+
+  { "IFS", sv_ifs },
+  { "IGNOREEOF", sv_ignoreeof },
+
+  { "LANG", sv_locale },
+  { "LC_ALL", sv_locale },
+  { "LC_COLLATE", sv_locale },
+  { "LC_CTYPE", sv_locale },
+  { "LC_MESSAGES", sv_locale },
+  { "LC_NUMERIC", sv_locale },
+  { "LC_TIME", sv_locale },
+
+#if defined (READLINE) && defined (STRICT_POSIX)
+  { "LINES", sv_winsize },
+#endif
+
+  { "MAIL", sv_mail },
+  { "MAILCHECK", sv_mail },
+  { "MAILPATH", sv_mail },
+
+  { "OPTERR", sv_opterr },
+  { "OPTIND", sv_optind },
+
+  { "PATH", sv_path },
+  { "POSIXLY_CORRECT", sv_strict_posix },
+
+#if defined (READLINE)
+  { "TERM", sv_terminal },
+  { "TERMCAP", sv_terminal },
+  { "TERMINFO", sv_terminal },
+#endif /* READLINE */
+
+  { "TEXTDOMAIN", sv_locale },
+  { "TEXTDOMAINDIR", sv_locale },
+
+#if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE)
+  { "TZ", sv_tz },
+#endif
+
+#if defined (HISTORY) && defined (BANG_HISTORY)
+  { "histchars", sv_histchars },
+#endif /* HISTORY && BANG_HISTORY */
+
+  { "ignoreeof", sv_ignoreeof },
+
+  { (char *)0, (sh_sv_func_t *)0 }
+};
+
+#define N_SPECIAL_VARS	(sizeof (special_vars) / sizeof (special_vars[0]) - 1)
+
+static int
+sv_compare (sv1, sv2)
+     struct name_and_function *sv1, *sv2;
+{
+  int r;
+
+  if ((r = sv1->name[0] - sv2->name[0]) == 0)
+    r = strcmp (sv1->name, sv2->name);
+  return r;
+}
+
+static inline int
+find_special_var (name)
+     const char *name;
+{
+  register int i, r;
+
+  for (i = 0; special_vars[i].name; i++)
+    {
+      r = special_vars[i].name[0] - name[0];
+      if (r == 0)
+	r = strcmp (special_vars[i].name, name);
+      if (r == 0)
+	return i;
+      else if (r > 0)
+	/* Can't match any of rest of elements in sorted list.  Take this out
+	   if it causes problems in certain environments. */
+        break;
+    }
+  return -1;
+}
+
+/* The variable in NAME has just had its state changed.  Check to see if it
+   is one of the special ones where something special happens. */
+void
+stupidly_hack_special_variables (name)
+     char *name;
+{
+  static int sv_sorted = 0;
+  int i;
+
+  if (sv_sorted == 0)	/* shouldn't need, but it's fairly cheap. */
+    {
+      qsort (special_vars, N_SPECIAL_VARS, sizeof (special_vars[0]),
+		(QSFUNC *)sv_compare);
+      sv_sorted = 1;
+    }
+
+  i = find_special_var (name);
+  if (i != -1)
+    (*(special_vars[i].function)) (name);
+}
+
+void
+sv_ifs (name)
+     char *name;
+{
+  SHELL_VAR *v;
+
+  v = find_variable ("IFS");
+  setifs (v);
+}
+
+/* What to do just after the PATH variable has changed. */
+void
+sv_path (name)
+     char *name;
+{
+  /* hash -r */
+  phash_flush ();
+}
+
+/* What to do just after one of the MAILxxxx variables has changed.  NAME
+   is the name of the variable.  This is called with NAME set to one of
+   MAIL, MAILCHECK, or MAILPATH.  */
+void
+sv_mail (name)
+     char *name;
+{
+  /* If the time interval for checking the files has changed, then
+     reset the mail timer.  Otherwise, one of the pathname vars
+     to the users mailbox has changed, so rebuild the array of
+     filenames. */
+  if (name[4] == 'C')  /* if (strcmp (name, "MAILCHECK") == 0) */
+    reset_mail_timer ();
+  else
+    {
+      free_mail_files ();
+      remember_mail_dates ();
+    }
+}
+
+/* What to do when GLOBIGNORE changes. */
+void
+sv_globignore (name)
+     char *name;
+{
+  setup_glob_ignore (name);
+}
+
+#if defined (READLINE)
+void
+sv_comp_wordbreaks (name)
+     char *name;
+{
+  SHELL_VAR *sv;
+
+  sv = find_variable (name);
+  if (sv == 0)
+    rl_completer_word_break_characters = (char *)NULL;
+}
+
+/* What to do just after one of the TERMxxx variables has changed.
+   If we are an interactive shell, then try to reset the terminal
+   information in readline. */
+void
+sv_terminal (name)
+     char *name;
+{
+  if (interactive_shell && no_line_editing == 0)
+    rl_reset_terminal (get_string_value ("TERM"));
+}
+
+void
+sv_hostfile (name)
+     char *name;
+{
+  SHELL_VAR *v;
+
+  v = find_variable (name);
+  if (v == 0)
+    clear_hostname_list ();
+  else
+    hostname_list_initialized = 0;
+}
+
+#if defined (STRICT_POSIX)
+/* In strict posix mode, we allow assignments to LINES and COLUMNS (and values
+   found in the initial environment) to override the terminal size reported by
+   the kernel. */
+void
+sv_winsize (name)
+     char *name;
+{
+  SHELL_VAR *v;
+  intmax_t xd;
+  int d;
+
+  if (posixly_correct == 0 || interactive_shell == 0 || no_line_editing)
+    return;
+
+  v = find_variable (name);
+  if (v == 0 || var_isnull (v))
+    rl_reset_screen_size ();
+  else
+    {
+      if (legal_number (value_cell (v), &xd) == 0)
+	return;
+      winsize_assignment = winsize_assigned = 1;
+      d = xd;			/* truncate */
+      if (name[0] == 'L')	/* LINES */
+	rl_set_screen_size (d, -1);
+      else			/* COLUMNS */
+	rl_set_screen_size (-1, d);
+      winsize_assignment = 0;
+    }
+}
+#endif /* STRICT_POSIX */
+#endif /* READLINE */
+
+/* Update the value of HOME in the export environment so tilde expansion will
+   work on cygwin. */
+#if defined (__CYGWIN__)
+sv_home (name)
+     char *name;
+{
+  array_needs_making = 1;
+  maybe_make_export_env ();
+}
+#endif
+
+#if defined (HISTORY)
+/* What to do after the HISTSIZE or HISTFILESIZE variables change.
+   If there is a value for this HISTSIZE (and it is numeric), then stifle
+   the history.  Otherwise, if there is NO value for this variable,
+   unstifle the history.  If name is HISTFILESIZE, and its value is
+   numeric, truncate the history file to hold no more than that many
+   lines. */
+void
+sv_histsize (name)
+     char *name;
+{
+  char *temp;
+  intmax_t num;
+  int hmax;
+
+  temp = get_string_value (name);
+
+  if (temp && *temp)
+    {
+      if (legal_number (temp, &num))
+	{
+	  if (name[4] == 'S')
+	    {
+	      hmax = num;
+	      stifle_history (hmax);
+	      num = where_history ();
+	      if (history_lines_this_session > num)
+		history_lines_this_session = num;
+	    }
+	  else
+	    {
+	      history_truncate_file (get_string_value ("HISTFILE"), (int)num);
+	      if (num <= history_lines_in_file)
+		history_lines_in_file = num;
+	    }
+	}
+    }
+  else if (name[4] == 'S')
+    unstifle_history ();
+}
+
+/* What to do after the HISTIGNORE variable changes. */
+void
+sv_histignore (name)
+     char *name;
+{
+  setup_history_ignore (name);
+}
+
+/* What to do after the HISTCONTROL variable changes. */
+void
+sv_history_control (name)
+     char *name;
+{
+  char *temp;
+  char *val;
+  int tptr;
+
+  history_control = 0;
+  temp = get_string_value (name);
+
+  if (temp == 0 || *temp == 0)
+    return;
+
+  tptr = 0;
+  while (val = extract_colon_unit (temp, &tptr))
+    {
+      if (STREQ (val, "ignorespace"))
+	history_control |= HC_IGNSPACE;
+      else if (STREQ (val, "ignoredups"))
+	history_control |= HC_IGNDUPS;
+      else if (STREQ (val, "ignoreboth"))
+	history_control |= HC_IGNBOTH;
+      else if (STREQ (val, "erasedups"))
+	history_control |= HC_ERASEDUPS;
+
+      free (val);
+    }
+}
+
+#if defined (BANG_HISTORY)
+/* Setting/unsetting of the history expansion character. */
+void
+sv_histchars (name)
+     char *name;
+{
+  char *temp;
+
+  temp = get_string_value (name);
+  if (temp)
+    {
+      history_expansion_char = *temp;
+      if (temp[0] && temp[1])
+	{
+	  history_subst_char = temp[1];
+	  if (temp[2])
+	      history_comment_char = temp[2];
+	}
+    }
+  else
+    {
+      history_expansion_char = '!';
+      history_subst_char = '^';
+      history_comment_char = '#';
+    }
+}
+#endif /* BANG_HISTORY */
+
+void
+sv_histtimefmt (name)
+     char *name;
+{
+  SHELL_VAR *v;
+
+  v = find_variable (name);
+  history_write_timestamps = (v != 0);
+}
+#endif /* HISTORY */
+
+#if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE)
+void
+sv_tz (name)
+     char *name;
+{
+  tzset ();
+}
+#endif
+
+/* If the variable exists, then the value of it can be the number
+   of times we actually ignore the EOF.  The default is small,
+   (smaller than csh, anyway). */
+void
+sv_ignoreeof (name)
+     char *name;
+{
+  SHELL_VAR *tmp_var;
+  char *temp;
+
+  eof_encountered = 0;
+
+  tmp_var = find_variable (name);
+  ignoreeof = tmp_var != 0;
+  temp = tmp_var ? value_cell (tmp_var) : (char *)NULL;
+  if (temp)
+    eof_encountered_limit = (*temp && all_digits (temp)) ? atoi (temp) : 10;
+  set_shellopts ();	/* make sure `ignoreeof' is/is not in $SHELLOPTS */
+}
+
+void
+sv_optind (name)
+     char *name;
+{
+  char *tt;
+  int s;
+
+  tt = get_string_value ("OPTIND");
+  if (tt && *tt)
+    {
+      s = atoi (tt);
+
+      /* According to POSIX, setting OPTIND=1 resets the internal state
+	 of getopt (). */
+      if (s < 0 || s == 1)
+	s = 0;
+    }
+  else
+    s = 0;
+  getopts_reset (s);
+}
+
+void
+sv_opterr (name)
+     char *name;
+{
+  char *tt;
+
+  tt = get_string_value ("OPTERR");
+  sh_opterr = (tt && *tt) ? atoi (tt) : 1;
+}
+
+void
+sv_strict_posix (name)
+     char *name;
+{
+  SET_INT_VAR (name, posixly_correct);
+  posix_initialize (posixly_correct);
+#if defined (READLINE)
+  if (interactive_shell)
+    posix_readline_initialize (posixly_correct);
+#endif /* READLINE */
+  set_shellopts ();	/* make sure `posix' is/is not in $SHELLOPTS */
+}
+
+void
+sv_locale (name)
+     char *name;
+{
+  char *v;
+
+  v = get_string_value (name);
+  if (name[0] == 'L' && name[1] == 'A')	/* LANG */
+    set_lang (name, v);
+  else
+    set_locale_var (name, v);		/* LC_*, TEXTDOMAIN* */
+}
+
+#if defined (ARRAY_VARS)
+void
+set_pipestatus_array (ps, nproc)
+     int *ps;
+     int nproc;
+{
+  SHELL_VAR *v;
+  ARRAY *a;
+  ARRAY_ELEMENT *ae;
+  register int i;
+  char *t, tbuf[INT_STRLEN_BOUND(int) + 1];
+
+  v = find_variable ("PIPESTATUS");
+  if (v == 0)
+    v = make_new_array_variable ("PIPESTATUS");
+  if (array_p (v) == 0)
+    return;		/* Do nothing if not an array variable. */
+  a = array_cell (v);
+
+  if (a == 0 || array_num_elements (a) == 0)
+    {
+      for (i = 0; i < nproc; i++)	/* was ps[i] != -1, not i < nproc */
+	{
+	  t = inttostr (ps[i], tbuf, sizeof (tbuf));
+	  array_insert (a, i, t);
+	}
+      return;
+    }
+
+  /* Fast case */
+  if (array_num_elements (a) == nproc && nproc == 1)
+    {
+      ae = element_forw (a->head);
+      free (element_value (ae));
+      ae->value = itos (ps[0]);
+    }
+  else if (array_num_elements (a) <= nproc)
+    {
+      /* modify in array_num_elements members in place, then add */
+      ae = a->head;
+      for (i = 0; i < array_num_elements (a); i++)
+	{
+	  ae = element_forw (ae);
+	  free (element_value (ae));
+	  ae->value = itos (ps[i]);
+	}
+      /* add any more */
+      for ( ; i < nproc; i++)
+	{
+	  t = inttostr (ps[i], tbuf, sizeof (tbuf));
+	  array_insert (a, i, t);
+	}
+    }
+  else
+    {
+      /* deleting elements.  it's faster to rebuild the array. */	  
+      array_flush (a);
+      for (i = 0; ps[i] != -1; i++)
+	{
+	  t = inttostr (ps[i], tbuf, sizeof (tbuf));
+	  array_insert (a, i, t);
+	}
+    }
+}
+#endif
+
+void
+set_pipestatus_from_exit (s)
+     int s;
+{
+#if defined (ARRAY_VARS)
+  static int v[2] = { 0, -1 };
+
+  v[0] = s;
+  set_pipestatus_array (v, 1);
+#endif
+}