initial import of bash 4.1

1 files changed, 354 insertions, 0 deletions

diff --git a/flags.c b/flags.c
new file mode 100644
index 0000000..d3b38ad
--- /dev/null
+++ b/flags.c
@@ -0,0 +1,354 @@
+/* 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;
+
+/* -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
+
+/* 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', &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 },
+
+  /* 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 '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';
+}