[thirdparty/bash.git] / flags.c

/* flags.c -- Everything about flags except the `set' command.  That
   is in builtins.c */

/* Copyright (C) 1987-2015 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "config.h"
#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#include "shell.h"
#include "flags.h"

#if defined (BANG_HISTORY)
#  include "bashhist.h"
#endif

#if defined (JOB_CONTROL)
extern int set_job_control __P((int));
#endif

#if defined (RESTRICTED_SHELL)
extern char *shell_name;
#endif

extern int shell_initialized;
extern int builtin_ignoring_errexit;

/* -c, -s invocation options -- not really flags, but they show up in $- */
extern int want_pending_command, read_from_stdin;

/* **************************************************************** */
/*								    */
/*			The Standard sh Flags.			    */
/*								    */
/* **************************************************************** */

/* Non-zero means automatically mark variables which are modified or created
   as auto export variables. */
int mark_modified_vars = 0;

/* Non-zero causes asynchronous job notification.  Otherwise, job state
   notification only takes place just before a primary prompt is printed. */
int asynchronous_notification = 0;

/* Non-zero means exit immediately if a command exits with a non-zero
   exit status.  The first is what controls set -e; the second is what
   bash uses internally. */
int errexit_flag = 0;
int exit_immediately_on_error = 0;

/* Non-zero means disable filename globbing. */
int disallow_filename_globbing = 0;

/* Non-zero means that all keyword arguments are placed into the environment
   for a command, not just those that appear on the line before the command
   name. */
int place_keywords_in_env = 0;

/* Non-zero means read commands, but don't execute them.  This is useful
   for debugging shell scripts that should do something hairy and possibly
   destructive. */
int read_but_dont_execute = 0;

/* Non-zero means end of file is after one command. */
int just_one_command = 0;

/* Non-zero means don't overwrite existing files while doing redirections. */
int noclobber = 0;

/* Non-zero means trying to get the value of $i where $i is undefined
   causes an error, instead of a null substitution. */
int unbound_vars_is_error = 0;

/* Non-zero means type out input lines after you read them. */
int echo_input_at_read = 0;
int verbose_flag = 0;

/* Non-zero means type out the command definition after reading, but
   before executing. */
int echo_command_at_execute = 0;

/* Non-zero means turn on the job control features. */
int jobs_m_flag = 0;

/* Non-zero means this shell is interactive, even if running under a
   pipe. */
int forced_interactive = 0;

/* By default, follow the symbolic links as if they were real directories
   while hacking the `cd' command.  This means that `cd ..' moves up in
   the string of symbolic links that make up the current directory, instead
   of the absolute directory.  The shell variable `nolinks' also controls
   this flag. */
int no_symbolic_links = 0;

/* **************************************************************** */
/*								    */
/*		     Non-Standard Flags Follow Here.		    */
/*								    */
/* **************************************************************** */

#if 0
/* Non-zero means do lexical scoping in the body of a FOR command. */
int lexical_scoping = 0;
#endif

/* Non-zero means no such thing as invisible variables. */
int no_invisible_vars = 0;

/* Non-zero means look up and remember command names in a hash table, */
int hashing_enabled = 1;

#if defined (BANG_HISTORY)
/* Non-zero means that we are doing history expansion.  The default.
   This means !22 gets the 22nd line of history. */
#  if defined (STRICT_POSIX)
int history_expansion = 0;
#  else
int history_expansion = 1;
#  endif
#endif /* BANG_HISTORY */

/* Non-zero means that we allow comments to appear in interactive commands. */
int interactive_comments = 1;

#if defined (RESTRICTED_SHELL)
/* Non-zero means that this shell is `restricted'.  A restricted shell
   disallows: changing directories, command or path names containing `/',
   unsetting or resetting the values of $PATH and $SHELL, and any type of
   output redirection. */
int restricted = 0;		/* currently restricted */
int restricted_shell = 0;	/* shell was started in restricted mode. */
#endif /* RESTRICTED_SHELL */

/* Non-zero means that this shell is running in `privileged' mode.  This
   is required if the shell is to run setuid.  If the `-p' option is
   not supplied at startup, and the real and effective uids or gids
   differ, disable_priv_mode is called to relinquish setuid status. */
int privileged_mode = 0;

#if defined (BRACE_EXPANSION)
/* Zero means to disable brace expansion: foo{a,b} -> fooa foob */
int brace_expansion = 1;
#endif

/* Non-zero means that shell functions inherit the DEBUG trap. */
int function_trace_mode = 0;

/* Non-zero means that shell functions inherit the ERR trap. */
int error_trace_mode = 0;

/* Non-zero means that the rightmost non-zero exit status in a pipeline
   is the exit status of the entire pipeline.  If each processes exits
   with a 0 status, the status of the pipeline is 0. */
int pipefail_opt = 0;

/* **************************************************************** */
/*								    */
/*			The Flags ALIST.			    */
/*								    */
/* **************************************************************** */

const struct flags_alist shell_flags[] = {
  /* Standard sh flags. */
  { 'a', &mark_modified_vars },
#if defined (JOB_CONTROL)
  { 'b', &asynchronous_notification },
#endif /* JOB_CONTROL */
  { 'e', &errexit_flag },
  { 'f', &disallow_filename_globbing },
  { 'h', &hashing_enabled },
  { 'i', &forced_interactive },
  { 'k', &place_keywords_in_env },
#if defined (JOB_CONTROL)
  { 'm', &jobs_m_flag },
#endif /* JOB_CONTROL */
  { 'n', &read_but_dont_execute },
  { 'p', &privileged_mode },
#if defined (RESTRICTED_SHELL)
  { 'r', &restricted },
#endif /* RESTRICTED_SHELL */
  { 't', &just_one_command },
  { 'u', &unbound_vars_is_error },
  { 'v', &verbose_flag },
  { 'x', &echo_command_at_execute },

  /* New flags that control non-standard things. */
#if 0
  { 'l', &lexical_scoping },
#endif
#if defined (BRACE_EXPANSION)
  { 'B', &brace_expansion },
#endif
  { 'C', &noclobber },
  { 'E', &error_trace_mode },
#if defined (BANG_HISTORY)
  { 'H', &history_expansion },
#endif /* BANG_HISTORY */
  { 'I', &no_invisible_vars },
  { 'P', &no_symbolic_links },
  { 'T', &function_trace_mode },
  {0, (int *)NULL}
};

#define NUM_SHELL_FLAGS (sizeof (shell_flags) / sizeof (struct flags_alist))

char optflags[NUM_SHELL_FLAGS+4] = { '+' };

int *
find_flag (name)
     int name;
{
  int i;
  for (i = 0; shell_flags[i].name; i++)
    {
      if (shell_flags[i].name == name)
	return (shell_flags[i].value);
    }
  return (FLAG_UNKNOWN);
}

/* Change the state of a flag, and return it's original value, or return
   FLAG_ERROR if there is no flag FLAG.  ON_OR_OFF must be either
   FLAG_ON or FLAG_OFF. */
int
change_flag (flag, on_or_off)
  int flag;
  int on_or_off;
{
  int *value, old_value;

#if defined (RESTRICTED_SHELL)
  /* Don't allow "set +r" in a shell which is `restricted'. */
  if (restricted && flag == 'r' && on_or_off == FLAG_OFF)
    return (FLAG_ERROR);
#endif /* RESTRICTED_SHELL */

  value = find_flag (flag);

  if ((value == (int *)FLAG_UNKNOWN) || (on_or_off != FLAG_ON && on_or_off != FLAG_OFF))
    return (FLAG_ERROR);

  old_value = *value;
  *value = (on_or_off == FLAG_ON) ? 1 : 0;

  /* Special cases for a few flags. */
  switch (flag)
    {
#if defined (BANG_HISTORY)
    case 'H':
      if (on_or_off == FLAG_ON)
	bash_initialize_history ();
      break;
#endif

#if defined (JOB_CONTROL)
    case 'm':
      set_job_control (on_or_off == FLAG_ON);
      break;
#endif /* JOB_CONTROL */

    case 'e':
      if (builtin_ignoring_errexit == 0)
	exit_immediately_on_error = errexit_flag;
      break;

    case 'n':
      if (interactive_shell)
	read_but_dont_execute = 0;
      break;

    case 'p':
      if (on_or_off == FLAG_OFF)
	disable_priv_mode ();
      break;

#if defined (RESTRICTED_SHELL)
    case 'r':
      if (on_or_off == FLAG_ON && shell_initialized)
	maybe_make_restricted (shell_name);
      break;
#endif

    case 'v':
      echo_input_at_read = verbose_flag;
      break;
    }

  return (old_value);
}

/* Return a string which is the names of all the currently
   set shell flags. */
char *
which_set_flags ()
{
  char *temp;
  int i, string_index;

  temp = (char *)xmalloc (1 + NUM_SHELL_FLAGS + read_from_stdin + want_pending_command);
  for (i = string_index = 0; shell_flags[i].name; i++)
    if (*(shell_flags[i].value))
      temp[string_index++] = shell_flags[i].name;

  if (want_pending_command)
    temp[string_index++] = 'c';
  if (read_from_stdin)
    temp[string_index++] = 's';

  temp[string_index] = '\0';
  return (temp);
}

char *
get_current_flags ()
{
  char *temp;
  int i;

  temp = (char *)xmalloc (1 + NUM_SHELL_FLAGS);
  for (i = 0; shell_flags[i].name; i++)
    temp[i] = *(shell_flags[i].value);
  temp[i] = '\0';
  return (temp);
}

void
set_current_flags (bitmap)
     const char *bitmap;
{
  int i;

  if (bitmap == 0)
    return;
  for (i = 0; shell_flags[i].name; i++)
    *(shell_flags[i].value) = bitmap[i];
}

void
reset_shell_flags ()
{
  mark_modified_vars = disallow_filename_globbing = 0;
  place_keywords_in_env = read_but_dont_execute = just_one_command = 0;
  noclobber = unbound_vars_is_error = 0;
  echo_command_at_execute = jobs_m_flag = forced_interactive = 0;
  no_symbolic_links = no_invisible_vars = 0;
  privileged_mode = pipefail_opt = 0;

  error_trace_mode = function_trace_mode = 0;

  exit_immediately_on_error = errexit_flag = 0;
  echo_input_at_read = verbose_flag = 0;

  hashing_enabled = interactive_comments = 1;

#if defined (JOB_CONTROL)
  asynchronous_notification = 0;
#endif

#if defined (BANG_HISTORY)
#  if defined (STRICT_POSIX)
  history_expansion = 0;
#  else
  history_expansion = 1;
#  endif /* STRICT_POSIX */
#endif

#if defined (BRACE_EXPANSION)
  brace_expansion = 1;
#endif

#if defined (RESTRICTED_SHELL)
  restricted = 0;
#endif
}

void
initialize_flags ()
{
  register int i;

  for (i = 0; shell_flags[i].name; i++)
    optflags[i+1] = shell_flags[i].name;
  optflags[++i] = 'o';
  optflags[++i] = ';';
  optflags[i+1] = '\0';
}
Commit	Line	Data
	1	/* flags.c -- Everything about flags except the `set' command. That
	2	is in builtins.c */
	3
	4	/* Copyright (C) 1987-2015 Free Software Foundation, Inc.
	5
	6	This file is part of GNU Bash, the Bourne Again SHell.
	7
	8	Bash is free software: you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation, either version 3 of the License, or
	11	(at your option) any later version.
	12
	13	Bash is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with Bash. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21
	22	#include "config.h"
	23	#if defined (HAVE_UNISTD_H)
	24	# include <unistd.h>
	25	#endif
	26
	27	#include "shell.h"
	28	#include "flags.h"
	29
	30	#if defined (BANG_HISTORY)
	31	# include "bashhist.h"
	32	#endif
	33
	34	#if defined (JOB_CONTROL)
	35	extern int set_job_control __P((int));
	36	#endif
	37
	38	#if defined (RESTRICTED_SHELL)
	39	extern char *shell_name;
	40	#endif
	41
	42	extern int shell_initialized;
	43	extern int builtin_ignoring_errexit;
	44
	45	/* -c, -s invocation options -- not really flags, but they show up in $- */
	46	extern int want_pending_command, read_from_stdin;
	47
	48	/* **************************************************************** */
	49	/* */
	50	/* The Standard sh Flags. */
	51	/* */
	52	/* **************************************************************** */
	53
	54	/* Non-zero means automatically mark variables which are modified or created
	55	as auto export variables. */
	56	int mark_modified_vars = 0;
	57
	58	/* Non-zero causes asynchronous job notification. Otherwise, job state
	59	notification only takes place just before a primary prompt is printed. */
	60	int asynchronous_notification = 0;
	61
	62	/* Non-zero means exit immediately if a command exits with a non-zero
	63	exit status. The first is what controls set -e; the second is what
	64	bash uses internally. */
	65	int errexit_flag = 0;
	66	int exit_immediately_on_error = 0;
	67
	68	/* Non-zero means disable filename globbing. */
	69	int disallow_filename_globbing = 0;
	70
	71	/* Non-zero means that all keyword arguments are placed into the environment
	72	for a command, not just those that appear on the line before the command
	73	name. */
	74	int place_keywords_in_env = 0;
	75
	76	/* Non-zero means read commands, but don't execute them. This is useful
	77	for debugging shell scripts that should do something hairy and possibly
	78	destructive. */
	79	int read_but_dont_execute = 0;
	80
	81	/* Non-zero means end of file is after one command. */
	82	int just_one_command = 0;
	83
	84	/* Non-zero means don't overwrite existing files while doing redirections. */
	85	int noclobber = 0;
	86
	87	/* Non-zero means trying to get the value of $i where $i is undefined
	88	causes an error, instead of a null substitution. */
	89	int unbound_vars_is_error = 0;
	90
	91	/* Non-zero means type out input lines after you read them. */
	92	int echo_input_at_read = 0;
	93	int verbose_flag = 0;
	94
	95	/* Non-zero means type out the command definition after reading, but
	96	before executing. */
	97	int echo_command_at_execute = 0;
	98
	99	/* Non-zero means turn on the job control features. */
	100	int jobs_m_flag = 0;
	101
	102	/* Non-zero means this shell is interactive, even if running under a
	103	pipe. */
	104	int forced_interactive = 0;
	105
	106	/* By default, follow the symbolic links as if they were real directories
	107	while hacking the `cd' command. This means that `cd ..' moves up in
	108	the string of symbolic links that make up the current directory, instead
	109	of the absolute directory. The shell variable `nolinks' also controls
	110	this flag. */
	111	int no_symbolic_links = 0;
	112
	113	/* **************************************************************** */
	114	/* */
	115	/* Non-Standard Flags Follow Here. */
	116	/* */
	117	/* **************************************************************** */
	118
	119	#if 0
	120	/* Non-zero means do lexical scoping in the body of a FOR command. */
	121	int lexical_scoping = 0;
	122	#endif
	123
	124	/* Non-zero means no such thing as invisible variables. */
	125	int no_invisible_vars = 0;
	126
	127	/* Non-zero means look up and remember command names in a hash table, */
	128	int hashing_enabled = 1;
	129
	130	#if defined (BANG_HISTORY)
	131	/* Non-zero means that we are doing history expansion. The default.
	132	This means !22 gets the 22nd line of history. */
	133	# if defined (STRICT_POSIX)
	134	int history_expansion = 0;
	135	# else
	136	int history_expansion = 1;
	137	# endif
	138	#endif /* BANG_HISTORY */
	139
	140	/* Non-zero means that we allow comments to appear in interactive commands. */
	141	int interactive_comments = 1;
	142
	143	#if defined (RESTRICTED_SHELL)
	144	/* Non-zero means that this shell is `restricted'. A restricted shell
	145	disallows: changing directories, command or path names containing `/',
	146	unsetting or resetting the values of $PATH and $SHELL, and any type of
	147	output redirection. */
	148	int restricted = 0; /* currently restricted */
	149	int restricted_shell = 0; /* shell was started in restricted mode. */
	150	#endif /* RESTRICTED_SHELL */
	151
	152	/* Non-zero means that this shell is running in `privileged' mode. This
	153	is required if the shell is to run setuid. If the `-p' option is
	154	not supplied at startup, and the real and effective uids or gids
	155	differ, disable_priv_mode is called to relinquish setuid status. */
	156	int privileged_mode = 0;
	157
	158	#if defined (BRACE_EXPANSION)
	159	/* Zero means to disable brace expansion: foo{a,b} -> fooa foob */
	160	int brace_expansion = 1;
	161	#endif
	162
	163	/* Non-zero means that shell functions inherit the DEBUG trap. */
	164	int function_trace_mode = 0;
	165
	166	/* Non-zero means that shell functions inherit the ERR trap. */
	167	int error_trace_mode = 0;
	168
	169	/* Non-zero means that the rightmost non-zero exit status in a pipeline
	170	is the exit status of the entire pipeline. If each processes exits
	171	with a 0 status, the status of the pipeline is 0. */
	172	int pipefail_opt = 0;
	173
	174	/* **************************************************************** */
	175	/* */
	176	/* The Flags ALIST. */
	177	/* */
	178	/* **************************************************************** */
	179
	180	const struct flags_alist shell_flags[] = {
	181	/* Standard sh flags. */
	182	{ 'a', &mark_modified_vars },
	183	#if defined (JOB_CONTROL)
	184	{ 'b', &asynchronous_notification },
	185	#endif /* JOB_CONTROL */
	186	{ 'e', &errexit_flag },
	187	{ 'f', &disallow_filename_globbing },
	188	{ 'h', &hashing_enabled },
	189	{ 'i', &forced_interactive },
	190	{ 'k', &place_keywords_in_env },
	191	#if defined (JOB_CONTROL)
	192	{ 'm', &jobs_m_flag },
	193	#endif /* JOB_CONTROL */
	194	{ 'n', &read_but_dont_execute },
	195	{ 'p', &privileged_mode },
	196	#if defined (RESTRICTED_SHELL)
	197	{ 'r', &restricted },
	198	#endif /* RESTRICTED_SHELL */
	199	{ 't', &just_one_command },
	200	{ 'u', &unbound_vars_is_error },
	201	{ 'v', &verbose_flag },
	202	{ 'x', &echo_command_at_execute },
	203
	204	/* New flags that control non-standard things. */
	205	#if 0
	206	{ 'l', &lexical_scoping },
	207	#endif
	208	#if defined (BRACE_EXPANSION)
	209	{ 'B', &brace_expansion },
	210	#endif
	211	{ 'C', &noclobber },
	212	{ 'E', &error_trace_mode },
	213	#if defined (BANG_HISTORY)
	214	{ 'H', &history_expansion },
	215	#endif /* BANG_HISTORY */
	216	{ 'I', &no_invisible_vars },
	217	{ 'P', &no_symbolic_links },
	218	{ 'T', &function_trace_mode },
	219	{0, (int *)NULL}
	220	};
	221
	222	#define NUM_SHELL_FLAGS (sizeof (shell_flags) / sizeof (struct flags_alist))
	223
	224	char optflags[NUM_SHELL_FLAGS+4] = { '+' };
	225
	226	int *
	227	find_flag (name)
	228	int name;
	229	{
	230	int i;
	231	for (i = 0; shell_flags[i].name; i++)
	232	{
	233	if (shell_flags[i].name == name)
	234	return (shell_flags[i].value);
	235	}
	236	return (FLAG_UNKNOWN);
	237	}
	238
	239	/* Change the state of a flag, and return it's original value, or return
	240	FLAG_ERROR if there is no flag FLAG. ON_OR_OFF must be either
	241	FLAG_ON or FLAG_OFF. */
	242	int
	243	change_flag (flag, on_or_off)
	244	int flag;
	245	int on_or_off;
	246	{
	247	int *value, old_value;
	248
	249	#if defined (RESTRICTED_SHELL)
	250	/* Don't allow "set +r" in a shell which is `restricted'. */
	251	if (restricted && flag == 'r' && on_or_off == FLAG_OFF)
	252	return (FLAG_ERROR);
	253	#endif /* RESTRICTED_SHELL */
	254
	255	value = find_flag (flag);
	256
	257	if ((value == (int *)FLAG_UNKNOWN) \|\| (on_or_off != FLAG_ON && on_or_off != FLAG_OFF))
	258	return (FLAG_ERROR);
	259
	260	old_value = *value;
	261	*value = (on_or_off == FLAG_ON) ? 1 : 0;
	262
	263	/* Special cases for a few flags. */
	264	switch (flag)
	265	{
	266	#if defined (BANG_HISTORY)
	267	case 'H':
	268	if (on_or_off == FLAG_ON)
	269	bash_initialize_history ();
	270	break;
	271	#endif
	272
	273	#if defined (JOB_CONTROL)
	274	case 'm':
	275	set_job_control (on_or_off == FLAG_ON);
	276	break;
	277	#endif /* JOB_CONTROL */
	278
	279	case 'e':
	280	if (builtin_ignoring_errexit == 0)
	281	exit_immediately_on_error = errexit_flag;
	282	break;
	283
	284	case 'n':
	285	if (interactive_shell)
	286	read_but_dont_execute = 0;
	287	break;
	288
	289	case 'p':
	290	if (on_or_off == FLAG_OFF)
	291	disable_priv_mode ();
	292	break;
	293
	294	#if defined (RESTRICTED_SHELL)
	295	case 'r':
	296	if (on_or_off == FLAG_ON && shell_initialized)
	297	maybe_make_restricted (shell_name);
	298	break;
	299	#endif
	300
	301	case 'v':
	302	echo_input_at_read = verbose_flag;
	303	break;
	304	}
	305
	306	return (old_value);
	307	}
	308
	309	/* Return a string which is the names of all the currently
	310	set shell flags. */
	311	char *
	312	which_set_flags ()
	313	{
	314	char *temp;
	315	int i, string_index;
	316
	317	temp = (char *)xmalloc (1 + NUM_SHELL_FLAGS + read_from_stdin + want_pending_command);
	318	for (i = string_index = 0; shell_flags[i].name; i++)
	319	if (*(shell_flags[i].value))
	320	temp[string_index++] = shell_flags[i].name;
	321
	322	if (want_pending_command)
	323	temp[string_index++] = 'c';
	324	if (read_from_stdin)
	325	temp[string_index++] = 's';
	326
	327	temp[string_index] = '\0';
	328	return (temp);
	329	}
	330
	331	char *
	332	get_current_flags ()
	333	{
	334	char *temp;
	335	int i;
	336
	337	temp = (char *)xmalloc (1 + NUM_SHELL_FLAGS);
	338	for (i = 0; shell_flags[i].name; i++)
	339	temp[i] = *(shell_flags[i].value);
	340	temp[i] = '\0';
	341	return (temp);
	342	}
	343
	344	void
	345	set_current_flags (bitmap)
	346	const char *bitmap;
	347	{
	348	int i;
	349
	350	if (bitmap == 0)
	351	return;
	352	for (i = 0; shell_flags[i].name; i++)
	353	*(shell_flags[i].value) = bitmap[i];
	354	}
	355
	356	void
	357	reset_shell_flags ()
	358	{
	359	mark_modified_vars = disallow_filename_globbing = 0;
	360	place_keywords_in_env = read_but_dont_execute = just_one_command = 0;
	361	noclobber = unbound_vars_is_error = 0;
	362	echo_command_at_execute = jobs_m_flag = forced_interactive = 0;
	363	no_symbolic_links = no_invisible_vars = 0;
	364	privileged_mode = pipefail_opt = 0;
	365
	366	error_trace_mode = function_trace_mode = 0;
	367
	368	exit_immediately_on_error = errexit_flag = 0;
	369	echo_input_at_read = verbose_flag = 0;
	370
	371	hashing_enabled = interactive_comments = 1;
	372
	373	#if defined (JOB_CONTROL)
	374	asynchronous_notification = 0;
	375	#endif
	376
	377	#if defined (BANG_HISTORY)
	378	# if defined (STRICT_POSIX)
	379	history_expansion = 0;
	380	# else
	381	history_expansion = 1;
	382	# endif /* STRICT_POSIX */
	383	#endif
	384
	385	#if defined (BRACE_EXPANSION)
	386	brace_expansion = 1;
	387	#endif
	388
	389	#if defined (RESTRICTED_SHELL)
	390	restricted = 0;
	391	#endif
	392	}
	393
	394	void
	395	initialize_flags ()
	396	{
	397	register int i;
	398
	399	for (i = 0; shell_flags[i].name; i++)
	400	optflags[i+1] = shell_flags[i].name;
	401	optflags[++i] = 'o';
	402	optflags[++i] = ';';
	403	optflags[i+1] = '\0';
	404	}