/App/win-bash_0_6/v01/bash-1.14.2/flags.c
C | 270 lines | 132 code | 48 blank | 90 comment | 20 complexity | 5220e8a92d6eb256c37ad67666b767fe MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, LGPL-2.1, CC-BY-SA-3.0, Unlicense, AGPL-1.0
- /* flags.c -- Everything about flags except the `set' command. That
- is in builtins.c */
- /* Copyright (C) 1987,1989 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
- /* Flags hacking. */
- #include "shell.h"
- #include "flags.h"
- /* **************************************************************** */
- /* */
- /* 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. */
- int exit_immediately_on_error = 0;
- /* Non-zero means disable filename globbing. */
- int disallow_filename_globbing = 0;
- /* Non-zero means to locate and remember function commands as functions are
- defined. Function commands are normally located when the function is
- executed. */
- int locate_commands_in_functions = 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 tham. This is useful
- for debugging shell scripts that should do something hairy and possibly
- desctructive. */
- 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. */
- /* */
- /* **************************************************************** */
- /* Non-zero means do lexical scoping in the body of a FOR command. */
- int lexical_scoping = 0;
- /* Non-zero means no such thing as invisible variables. */
- int no_invisible_vars = 0;
- /* Non-zero means don't look up or remember command names in a hash table, */
- int hashing_disabled = 0;
- #if defined (HISTORY)
- /* Non-zero means that we are doing history expansion. The default.
- This means !22 gets the 22nd line of history. */
- int history_expansion = 1;
- #endif /* HISTORY */
- /* Non-zero means that we allow comments to appear in interactive commands. */
- #if defined (INTERACTIVE_COMMENTS)
- int interactive_comments = 1;
- #else
- int interactive_comments = 0;
- #endif /* INTERACTIVE_COMMENTS */
- #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;
- #endif /* RESTRICTED_SHELL */
- /* Non-zero means that this shell is running in `privileged' mode. This
- mode is entered on startup if the real and effective uids or gids
- differ. */
- int privileged_mode = 0;
- /* **************************************************************** */
- /* */
- /* The Flags ALIST. */
- /* */
- /* **************************************************************** */
- struct flags_alist shell_flags[] = {
- /* Standard sh flags. */
- { 'a', &mark_modified_vars },
- #if defined (JOB_CONTROL)
- { 'b', &asynchronous_notification },
- #endif /* JOB_CONTROL */
- { 'e', &exit_immediately_on_error },
- { 'f', &disallow_filename_globbing },
- { 'h', &locate_commands_in_functions }, /* Oh, yeah, good mnemonic. */
- { '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 },
- { 'C', &noclobber },
- /* New flags that control non-standard things. */
- { 'l', &lexical_scoping },
- { 'I', &no_invisible_vars },
- /* I want `h', but locate_commands_in_functions has it. Great. */
- { 'd', &hashing_disabled },
- { 'P', &no_symbolic_links },
- #if defined (HISTORY)
- /* Once again, we don't have the right mnemonic. */
- { 'H', &history_expansion },
- #endif /* HISTORY */
- {0, (int *)NULL}
- };
- #define NUM_SHELL_FLAGS (sizeof (shell_flags) / sizeof (struct flags_alist))
- int *
- find_flag (name)
- int name;
- {
- int i = 0;
- while (shell_flags[i].name)
- {
- if (shell_flags[i].name == name)
- return (shell_flags[i].value);
- i++;
- }
- return (FLAG_UNKNOWN);
- }
- /* Change the state of a flag, and return it's original value, or return
- FLAG_ERROR if there is no flag called NAME. ON_OR_OFF should be one
- of FLAG_ON or FLAG_OFF. */
- int
- change_flag (flag, on_or_off)
- int flag;
- int on_or_off;
- {
- int *value = find_flag (flag);
- int 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 */
- if (value == (int *)FLAG_UNKNOWN)
- return (FLAG_ERROR);
- else
- old_value = *value;
- if (on_or_off == FLAG_ON)
- *value = 1;
- else
- {
- if (on_or_off == FLAG_OFF)
- *value = 0;
- else
- return (FLAG_ERROR);
- }
- /* Special cases for a few flags. */
- switch (flag)
- {
- #if defined (JOB_CONTROL)
- case 'm':
- set_job_control (on_or_off == '-');
- break;
- #endif /* JOB_CONTROL */
- case 'p':
- if (on_or_off == '+')
- {
- setuid (current_user.uid);
- setgid (current_user.gid);
- current_user.euid = current_user.uid;
- current_user.egid = current_user.gid;
- }
- break;
- }
-
- return (old_value);
- }
- /* Return a string which is the names of all the currently
- set shell flags. */
- char *
- which_set_flags ()
- {
- char *temp = (char *)xmalloc (1 + NUM_SHELL_FLAGS);
- int i, string_index = 0;
- for (i = 0; shell_flags[i].name; i++)
- if (*(shell_flags[i].value))
- temp[string_index++] = shell_flags[i].name;
- temp[string_index] = '\0';
- return (temp);
- }