| /* flags.c -- Everything about flags except the `set' command. That |
| is in builtins.c */ |
| |
| /* Copyright (C) 1987-2009 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; |
| |
| /* 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', &echo_input_at_read }, |
| { '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 |
| |
| } |
| |
| 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); |
| } |
| |
| void |
| reset_shell_flags () |
| { |
| mark_modified_vars = exit_immediately_on_error = disallow_filename_globbing = 0; |
| place_keywords_in_env = read_but_dont_execute = just_one_command = 0; |
| noclobber = unbound_vars_is_error = echo_input_at_read = 0; |
| echo_command_at_execute = jobs_m_flag = forced_interactive = 0; |
| no_symbolic_links = no_invisible_vars = privileged_mode = pipefail_opt = 0; |
| |
| hashing_enabled = interactive_comments = 1; |
| |
| #if defined (JOB_CONTROL) |
| asynchronous_notification = 0; |
| #endif |
| |
| #if defined (BANG_HISTORY) |
| history_expansion = 1; |
| #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'; |
| } |