/* 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 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. */ /* Flags hacking. */ #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 /* -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. */ 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. */ int history_expansion = 1; #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 /* **************************************************************** */ /* */ /* 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', &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 }, { 'C', &noclobber }, /* New flags that control non-standard things. */ #if 0 { 'l', &lexical_scoping }, #endif { 'I', &no_invisible_vars }, { 'P', &no_symbolic_links }, #if defined (BRACE_EXPANSION) { 'B', &brace_expansion }, #endif #if defined (BANG_HISTORY) { 'H', &history_expansion }, #endif /* BANG_HISTORY */ {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 '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) 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 = 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'; }