/* flags.c -- Everything about flags except the `set' command. That
is in builtins.c */
-/* Copyright (C) 1987,1989 Free Software Foundation, Inc.
+/* Copyright (C) 1987-2009 Free Software Foundation, Inc.
-This file is part of GNU Bash, the Bourne Again SHell.
+ 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 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.
+ 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. */
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
-/* 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
+
+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. */
+/* The Standard sh Flags. */
/* */
/* **************************************************************** */
int asynchronous_notification = 0;
/* Non-zero means exit immediately if a command exits with a non-zero
- exit status. */
+ 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 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
+/* Non-zero means read commands, but don't execute them. This is useful
for debugging shell scripts that should do something hairy and possibly
- desctructive. */
+ destructive. */
int read_but_dont_execute = 0;
/* Non-zero means end of file is after one command. */
/* */
/* **************************************************************** */
-
+#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 don't look up or remember command names in a hash table, */
-int hashing_disabled = 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. */
-#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;
+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
- mode is entered on startup if the real and effective uids or gids
- differ. */
+ 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. */
/* */
/* **************************************************************** */
-struct flags_alist shell_flags[] = {
+const 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 },
+ { 'e', &errexit_flag },
{ 'f', &disallow_filename_globbing },
- { 'h', &locate_commands_in_functions }, /* Oh, yeah, good mnemonic. */
+ { 'h', &hashing_enabled },
{ 'i', &forced_interactive },
{ 'k', &place_keywords_in_env },
#if defined (JOB_CONTROL)
{ '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 },
- { 'I', &no_invisible_vars },
-
- /* I want `h', but locate_commands_in_functions has it. Great. */
- { 'd', &hashing_disabled },
-
- { 'P', &no_symbolic_links },
-
+#endif
+#if defined (BRACE_EXPANSION)
+ { 'B', &brace_expansion },
+#endif
+ { 'C', &noclobber },
+ { 'E', &error_trace_mode },
#if defined (BANG_HISTORY)
- /* Once again, we don't have the right mnemonic. */
{ '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 = 0;
- while (shell_flags[i].name)
+ int i;
+ for (i = 0; shell_flags[i].name; i++)
{
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. */
+ 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 = find_flag (flag);
- int old_value;
+ int *value, old_value;
#if defined (RESTRICTED_SHELL)
/* Don't allow "set +r" in a shell which is `restricted'. */
return (FLAG_ERROR);
#endif /* RESTRICTED_SHELL */
- if (value == (int *)FLAG_UNKNOWN)
+ value = find_flag (flag);
+
+ if ((value == (int *)FLAG_UNKNOWN) || (on_or_off != FLAG_ON && on_or_off != FLAG_OFF))
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);
- }
+ 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 == '-');
+ 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 == '+')
- {
- setuid (current_user.uid);
- setgid (current_user.gid);
- current_user.euid = current_user.uid;
- current_user.egid = current_user.gid;
- }
+ 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);
}
char *
which_set_flags ()
{
- char *temp = (char *)xmalloc (1 + NUM_SHELL_FLAGS);
+ char *temp;
+ int i, string_index;
- int i, string_index = 0;
-
- for (i = 0; shell_flags[i].name; i++)
+ 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';
+}
projects / platform / upstream / bash.git / blobdiff