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+/* flags.c -- Everything about flags except the `set' command. That
+ is in builtins.c */
+
+/* Copyright (C) 1987-2021 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 "execute_cmd.h"
+#include "flags.h"
+
+#if defined (BANG_HISTORY)
+# include "bashhist.h"
+#endif
+
+#if defined (JOB_CONTROL)
+extern int set_job_control PARAMS((int));
+#endif
+
+/* **************************************************************** */
+/* */
+/* 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 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. */
+int history_expansion = HISTEXPAND_DEFAULT;
+int histexp_flag = 0;
+#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', &histexp_flag },
+#endif /* BANG_HISTORY */
+ { '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':
+ history_expansion = histexp_flag;
+ 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 = 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)
+ histexp_flag = 0;
+#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';
+}