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bashline.cc
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bashline.cc
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/* bashline.cc -- Bash's interface to the readline library. */
/* Copyright (C) 1987-2022 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(READLINE)
#include "builtins.hh"
#include "flags.hh"
#include "input.hh"
#include "parser.hh"
#include "pathexp.hh"
#include "shell.hh"
#include "shmbutil.hh"
#include "trap.hh"
#if defined(HAVE_MBSTR_H) && defined(HAVE_MBSCHR)
#include <mbstr.h> /* mbschr */
#endif
#include "builtext.hh" /* for read_builtin */
#include "common.hh"
#include <glob.h>
#if defined(ALIAS)
#include "alias.hh"
#endif
#if defined(PROGRAMMABLE_COMPLETION)
#include "pcomplete.hh"
#endif
namespace bash
{
/* These should agree with the defines for emacs_mode and vi_mode in
rldefs.h, even though that's not a public readline header file. */
#ifndef EMACS_EDITING_MODE
#define NO_EDITING_MODE -1
#define EMACS_EDITING_MODE 1
#define VI_EDITING_MODE 0
#endif
/* Copied from rldefs.h, since that's not a public readline header file. */
#ifndef FUNCTION_TO_KEYMAP
#if defined(CRAY)
#define FUNCTION_TO_KEYMAP(map, key) (Keymap) ((int)map[key].function)
#define KEYMAP_TO_FUNCTION(data) (rl_command_func_t *)((int)(data))
#else
#define FUNCTION_TO_KEYMAP(map, key) (Keymap) (map[key].function)
#define KEYMAP_TO_FUNCTION(data) (rl_command_func_t *)(data)
#endif
#endif
#define RL_BOOLEAN_VARIABLE_VALUE(s) \
((s)[0] == 'o' && (s)[1] == 'n' && (s)[2] == '\0')
#if 0
#if defined(BRACE_COMPLETION)
extern int bash_brace_completion (int, int);
#endif /* BRACE_COMPLETION */
/* To avoid including curses.h/term.h/termcap.h and that whole mess. */
extern int tputs (const char *string, int nlines, int (*outx (int)));
/* Forward declarations */
/* Functions bound to keys in Readline for Bash users. */
static int shell_expand_line (int, int);
static int display_shell_version (int, int);
static int bash_ignore_filenames (char **);
static int bash_ignore_everything (char **);
static int bash_progcomp_ignore_filenames (char **);
#if defined(BANG_HISTORY)
static char *history_expand_line_internal (char *);
static int history_expand_line (int, int);
static int tcsh_magic_space (int, int);
#endif /* BANG_HISTORY */
#ifdef ALIAS
static int alias_expand_line (int, int);
#endif
#if defined(BANG_HISTORY) && defined(ALIAS)
static int history_and_alias_expand_line (int, int);
#endif
static int bash_forward_shellword (int, int);
static int bash_backward_shellword (int, int);
static int bash_kill_shellword (int, int);
static int bash_backward_kill_shellword (int, int);
static int bash_transpose_shellwords (int, int);
static int bash_spell_correct_shellword PARAMS ((int, int));
/* Helper functions for Readline. */
static char *restore_tilde (char *, char *);
static char *maybe_restore_tilde (char *, char *);
static char *bash_filename_rewrite_hook (char *, int);
static void bash_directory_expansion (char **);
static int bash_filename_stat_hook (char **);
static int bash_command_name_stat_hook (char **);
static int bash_directory_completion_hook (char **);
static int filename_completion_ignore (char **);
static int bash_push_line (void);
static int executable_completion (const char *, int);
static rl_icppfunc_t *save_directory_hook (void);
static void restore_directory_hook (rl_icppfunc_t);
static int directory_exists (const char *, int);
static void cleanup_expansion_error (void);
static void maybe_make_readline_line (char *);
static void set_up_new_line (char *);
static bool check_redir (int);
static char **attempt_shell_completion (const char *, int, int);
static char *variable_completion_function (const char *, int);
static char *hostname_completion_function (const char *, int);
static char *command_subst_completion_function (const char *, int);
static void build_history_completion_array (void);
static char *history_completion_generator (const char *, int);
static int dynamic_complete_history (int, int);
static int bash_dabbrev_expand (int, int);
static void initialize_hostname_list (void);
static void add_host_name (char *);
static void snarf_hosts_from_file (const char *);
static char **hostnames_matching (char *);
static void _ignore_completion_names (char **, sh_ignore_func_t *);
static bool name_is_acceptable (const char *);
static bool test_for_directory (const char *);
static bool test_for_canon_directory (const char *);
static bool return_zero (const char *);
static char *bash_dequote_filename (char *, int);
static char *quote_word_break_chars (char *);
static void set_filename_bstab (const char *);
static char *bash_quote_filename (char *, int, char *);
static int putx (int);
static int readline_get_char_offset (int);
static void readline_set_char_offset (int, int *);
static Keymap get_cmd_xmap_from_edit_mode (void);
static Keymap get_cmd_xmap_from_keymap (Keymap);
static void init_unix_command_map (void);
static int isolate_sequence (const char *, int, bool, int *);
static int set_saved_history (void);
#if defined(ALIAS)
static int posix_edit_macros (int, int);
#endif
static int bash_event_hook (void);
#if defined(PROGRAMMABLE_COMPLETION)
static int find_cmd_start (int);
static int find_cmd_end (int);
static char *find_cmd_name (int, int *, int *);
static char *prog_complete_return (const char *, int);
static char **prog_complete_matches;
#endif
extern int no_symbolic_links;
extern STRING_INT_ALIST word_token_alist[];
extern sh_timer *read_timeout;
/* SPECIFIC_COMPLETION_FUNCTIONS specifies that we have individual
completion functions which indicate what type of completion should be
done (at or before point) that can be bound to key sequences with
the readline library. */
#define SPECIFIC_COMPLETION_FUNCTIONS
#if defined(SPECIFIC_COMPLETION_FUNCTIONS)
static int bash_specific_completion (int, rl_compentry_func_t *);
static int bash_complete_filename_internal (int);
static int bash_complete_username_internal (int);
static int bash_complete_hostname_internal (int);
static int bash_complete_variable_internal (int);
static int bash_complete_command_internal (int);
static int bash_complete_filename (int, int);
static int bash_possible_filename_completions (int, int);
static int bash_complete_username (int, int);
static int bash_possible_username_completions (int, int);
static int bash_complete_hostname (int, int);
static int bash_possible_hostname_completions (int, int);
static int bash_complete_variable (int, int);
static int bash_possible_variable_completions (int, int);
static int bash_complete_command (int, int);
static int bash_possible_command_completions (int, int);
static bool completion_glob_pattern (char *);
static char *glob_complete_word (const char *, int);
static int bash_glob_completion_internal (int);
static int bash_glob_complete_word (int, int);
static int bash_glob_expand_word (int, int);
static int bash_glob_list_expansions (int, int);
#endif /* SPECIFIC_COMPLETION_FUNCTIONS */
static int edit_and_execute_command (int, int, int, const char *);
#if defined(VI_MODE)
static int vi_edit_and_execute_command (int, int);
static int bash_vi_complete (int, int);
#endif
static int emacs_edit_and_execute_command (int, int);
/* Non-zero once initialize_readline () has been called. */
bool bash_readline_initialized = false;
/* If non-zero, we do hostname completion, breaking words at `@' and
trying to complete the stuff after the `@' from our own internal
host list. */
char perform_hostname_completion = 1;
/* If non-zero, we don't do command completion on an empty line. */
char no_empty_command_completion;
/* Set FORCE_FIGNORE if you want to honor FIGNORE even if it ignores the
only possible matches. Set to 0 if you want to match filenames if they
are the only possible matches, even if FIGNORE says to. */
char force_fignore = 1;
/* Perform spelling correction on directory names during word completion */
char dircomplete_spelling = 0;
/* Expand directory names during word/filename completion. */
#if DIRCOMPLETE_EXPAND_DEFAULT
char dircomplete_expand = 1;
char dircomplete_expand_relpath = 1;
#else
char dircomplete_expand = 0;
char dircomplete_expand_relpath = 0;
#endif
/* When non-zero, perform `normal' shell quoting on completed filenames
even when the completed name contains a directory name with a shell
variable reference, so dollar signs in a filename get quoted appropriately.
Set to zero to remove dollar sign (and braces or parens as needed) from
the set of characters that will be quoted. */
char complete_fullquote = 1;
static const char *bash_completer_word_break_characters = " \t\n\"'@><=;|&(:";
static const char *bash_nohostname_word_break_characters = " \t\n\"'><=;|&(:";
static const char *default_filename_quote_characters
= " \t\n\\\"'@<>=;|&()#$`?*[!:{~";
static char *custom_filename_quote_characters = 0;
static char filename_bstab[256];
static rl_hook_func_t *old_rl_startup_hook = (rl_hook_func_t *)NULL;
static bool dot_in_path = false;
/* Set to non-zero when dabbrev-expand is running */
static bool dabbrev_expand_active = false;
/* What kind of quoting is performed by bash_quote_filename:
COMPLETE_DQUOTE = double-quoting the filename
COMPLETE_SQUOTE = single_quoting the filename
COMPLETE_BSQUOTE = backslash-quoting special chars in the filename
*/
#define COMPLETE_DQUOTE 1
#define COMPLETE_SQUOTE 2
#define COMPLETE_BSQUOTE 3
static int completion_quoting_style = COMPLETE_BSQUOTE;
/* Flag values for the final argument to bash_default_completion */
#define DEFCOMP_CMDPOS 1
static rl_command_func_t *vi_tab_binding = rl_complete;
#endif
/* Change the readline VI-mode keymaps into or out of Posix.2 compliance.
Called when the shell is put into or out of `posix' mode. */
void
Shell::posix_readline_initialize (int on_or_off)
{
static char kseq[2] = { CTRL ('I'), 0 }; /* TAB */
if (on_or_off)
rl_variable_bind ("comment-begin", "#");
#if defined(VI_MODE)
if (on_or_off)
{
vi_tab_binding
= rl_function_of_keyseq (kseq, vi_insertion_keymap, nullptr);
rl_bind_key_in_map (CTRL ('I'), rl_insert, vi_insertion_keymap);
}
else
{
if (rl_function_of_keyseq (kseq, vi_insertion_keymap, nullptr)
== rl_insert)
rl_bind_key_in_map (CTRL ('I'), vi_tab_binding, vi_insertion_keymap);
}
#endif
}
void
Shell::reset_completer_word_break_chars ()
{
rl_completer_word_break_characters
= perform_hostname_completion
? savestring (bash_completer_word_break_characters)
: savestring (bash_nohostname_word_break_characters);
}
/* When this function returns, rl_completer_word_break_characters points to
dynamically allocated memory. */
int
Shell::enable_hostname_completion (int on_or_off)
{
int old_value;
char *nv, *nval;
const char *at;
old_value = perform_hostname_completion;
if (on_or_off)
{
perform_hostname_completion = 1;
rl_special_prefixes = "$@";
}
else
{
perform_hostname_completion = 0;
rl_special_prefixes = "$";
}
/* Now we need to figure out how to appropriately modify and assign
rl_completer_word_break_characters depending on whether we want
hostname completion on or off. */
/* If this is the first time this has been called
(bash_readline_initialized == 0), use the sames values as before, but
allocate new memory for rl_completer_word_break_characters. */
if (bash_readline_initialized == 0
&& (rl_completer_word_break_characters == 0
|| rl_completer_word_break_characters
== rl_basic_word_break_characters))
{
if (on_or_off)
rl_completer_word_break_characters
= savestring (bash_completer_word_break_characters);
else
rl_completer_word_break_characters
= savestring (bash_nohostname_word_break_characters);
}
else
{
/* See if we have anything to do. */
at = strchr (rl_completer_word_break_characters, '@');
if ((at == 0 && on_or_off == 0) || (at != 0 && on_or_off != 0))
return old_value;
/* We have something to do. Do it. */
nval = (char *)xmalloc (strlen (rl_completer_word_break_characters) + 1
+ on_or_off);
if (on_or_off == 0)
{
/* Turn it off -- just remove `@' from word break chars. We want
to remove all occurrences of `@' from the char list, so we loop
rather than just copy the rest of the list over AT. */
for (nv = nval, at = rl_completer_word_break_characters; *at;)
if (*at != '@')
*nv++ = *at++;
else
at++;
*nv = '\0';
}
else
{
nval[0] = '@';
strcpy (nval + 1, rl_completer_word_break_characters);
}
free ((void *)rl_completer_word_break_characters);
rl_completer_word_break_characters = nval;
}
return old_value;
}
/* Called once from parse.y if we are going to use readline. */
void
Shell::initialize_readline ()
{
rl_command_func_t *func;
char kseq[2];
if (bash_readline_initialized)
return;
rl_terminal_name = get_string_value ("TERM");
rl_instream = stdin;
rl_outstream = stderr;
/* Allow conditional parsing of the ~/.inputrc file. */
rl_readline_name = "Bash";
/* Add bindable names before calling rl_initialize so they may be
referenced in the various inputrc files. */
rl_add_defun ("shell-expand-line", shell_expand_line, -1);
#ifdef BANG_HISTORY
rl_add_defun ("history-expand-line", history_expand_line, -1);
rl_add_defun ("magic-space", tcsh_magic_space, -1);
#endif
rl_add_defun ("shell-forward-word", bash_forward_shellword, -1);
rl_add_defun ("shell-backward-word", bash_backward_shellword, -1);
rl_add_defun ("shell-kill-word", bash_kill_shellword, -1);
rl_add_defun ("shell-backward-kill-word", bash_backward_kill_shellword, -1);
rl_add_defun ("shell-transpose-words", bash_transpose_shellwords, -1);
rl_add_defun ("spell-correct-word", bash_spell_correct_shellword, -1);
rl_bind_key_if_unbound_in_map ('s', bash_spell_correct_shellword,
emacs_ctlx_keymap);
#ifdef ALIAS
rl_add_defun ("alias-expand-line", alias_expand_line, -1);
#ifdef BANG_HISTORY
rl_add_defun ("history-and-alias-expand-line", history_and_alias_expand_line,
-1);
#endif
#endif
/* Backwards compatibility. */
rl_add_defun ("insert-last-argument", rl_yank_last_arg, -1);
rl_add_defun ("display-shell-version", display_shell_version, -1);
rl_add_defun ("edit-and-execute-command", emacs_edit_and_execute_command,
-1);
#if defined(VI_MODE)
rl_add_defun ("vi-edit-and-execute-command", vi_edit_and_execute_command,
-1);
#endif
#if defined(BRACE_COMPLETION)
rl_add_defun ("complete-into-braces", bash_brace_completion, -1);
#endif
#if defined(SPECIFIC_COMPLETION_FUNCTIONS)
rl_add_defun ("complete-filename", bash_complete_filename, -1);
rl_add_defun ("possible-filename-completions",
bash_possible_filename_completions, -1);
rl_add_defun ("complete-username", bash_complete_username, -1);
rl_add_defun ("possible-username-completions",
bash_possible_username_completions, -1);
rl_add_defun ("complete-hostname", bash_complete_hostname, -1);
rl_add_defun ("possible-hostname-completions",
bash_possible_hostname_completions, -1);
rl_add_defun ("complete-variable", bash_complete_variable, -1);
rl_add_defun ("possible-variable-completions",
bash_possible_variable_completions, -1);
rl_add_defun ("complete-command", bash_complete_command, -1);
rl_add_defun ("possible-command-completions",
bash_possible_command_completions, -1);
rl_add_defun ("glob-complete-word", bash_glob_complete_word, -1);
rl_add_defun ("glob-expand-word", bash_glob_expand_word, -1);
rl_add_defun ("glob-list-expansions", bash_glob_list_expansions, -1);
#endif
rl_add_defun ("dynamic-complete-history", dynamic_complete_history, -1);
rl_add_defun ("dabbrev-expand", bash_dabbrev_expand, -1);
/* Bind defaults before binding our custom shell keybindings. */
if (RL_ISSTATE (RL_STATE_INITIALIZED) == 0)
rl_initialize ();
/* Bind up our special shell functions. */
rl_bind_key_if_unbound_in_map (CTRL ('E'), shell_expand_line,
emacs_meta_keymap);
#ifdef BANG_HISTORY
rl_bind_key_if_unbound_in_map ('^', history_expand_line, emacs_meta_keymap);
#endif
rl_bind_key_if_unbound_in_map (CTRL ('V'), display_shell_version,
emacs_ctlx_keymap);
/* In Bash, the user can switch editing modes with "set -o [vi emacs]",
so it is not necessary to allow C-M-j for context switching. Turn
off this occasionally confusing behaviour. */
kseq[0] = CTRL ('J');
kseq[1] = '\0';
func = rl_function_of_keyseq (kseq, emacs_meta_keymap, nullptr);
if (func == rl_vi_editing_mode)
rl_unbind_key_in_map (CTRL ('J'), emacs_meta_keymap);
kseq[0] = CTRL ('M');
func = rl_function_of_keyseq (kseq, emacs_meta_keymap, nullptr);
if (func == rl_vi_editing_mode)
rl_unbind_key_in_map (CTRL ('M'), emacs_meta_keymap);
#if defined(VI_MODE)
kseq[0] = CTRL ('E');
func = rl_function_of_keyseq (kseq, vi_movement_keymap, nullptr);
if (func == rl_emacs_editing_mode)
rl_unbind_key_in_map (CTRL ('E'), vi_movement_keymap);
#endif
#if defined(BRACE_COMPLETION)
rl_bind_key_if_unbound_in_map ('{', bash_brace_completion,
emacs_meta_keymap);
#endif /* BRACE_COMPLETION */
#if defined(SPECIFIC_COMPLETION_FUNCTIONS)
rl_bind_key_if_unbound_in_map ('/', bash_complete_filename,
emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('/', bash_possible_filename_completions,
emacs_ctlx_keymap);
/* Have to jump through hoops here because there is a default binding for
M-~ (rl_tilde_expand) */
kseq[0] = '~';
kseq[1] = '\0';
func = rl_function_of_keyseq (kseq, emacs_meta_keymap, nullptr);
if (func == 0 || func == rl_tilde_expand)
rl_bind_keyseq_in_map (kseq, bash_complete_username, emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('~', bash_possible_username_completions,
emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('@', bash_complete_hostname,
emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('@', bash_possible_hostname_completions,
emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('$', bash_complete_variable,
emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('$', bash_possible_variable_completions,
emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('!', bash_complete_command,
emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('!', bash_possible_command_completions,
emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('g', bash_glob_complete_word,
emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('*', bash_glob_expand_word,
emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('g', bash_glob_list_expansions,
emacs_ctlx_keymap);
#endif /* SPECIFIC_COMPLETION_FUNCTIONS */
kseq[0] = TAB;
kseq[1] = '\0';
func = rl_function_of_keyseq (kseq, emacs_meta_keymap, nullptr);
if (func == 0 || func == rl_tab_insert)
rl_bind_key_in_map (TAB, dynamic_complete_history, emacs_meta_keymap);
/* Tell the completer that we want a crack first. */
rl_attempted_completion_function = attempt_shell_completion;
/* Tell the completer that we might want to follow symbolic links or
do other expansion on directory names. */
set_directory_hook ();
rl_filename_rewrite_hook = bash_filename_rewrite_hook;
rl_filename_stat_hook = bash_filename_stat_hook;
/* Tell the filename completer we want a chance to ignore some names. */
rl_ignore_some_completions_function = filename_completion_ignore;
/* Bind C-xC-e to invoke emacs and run result as commands. */
rl_bind_key_if_unbound_in_map (CTRL ('E'), emacs_edit_and_execute_command,
emacs_ctlx_keymap);
#if defined(VI_MODE)
rl_bind_key_if_unbound_in_map ('v', vi_edit_and_execute_command,
vi_movement_keymap);
#if defined(ALIAS)
rl_bind_key_if_unbound_in_map ('@', posix_edit_macros, vi_movement_keymap);
#endif
rl_bind_key_in_map ('\\', bash_vi_complete, vi_movement_keymap);
rl_bind_key_in_map ('*', bash_vi_complete, vi_movement_keymap);
rl_bind_key_in_map ('=', bash_vi_complete, vi_movement_keymap);
#endif
rl_completer_quote_characters = "'\"";
/* This sets rl_completer_word_break_characters and rl_special_prefixes
to the appropriate values, depending on whether or not hostname
completion is enabled. */
enable_hostname_completion (perform_hostname_completion);
/* characters that need to be quoted when appearing in filenames. */
rl_filename_quote_characters = default_filename_quote_characters;
set_filename_bstab (rl_filename_quote_characters);
rl_filename_quoting_function = bash_quote_filename;
rl_filename_dequoting_function = bash_dequote_filename;
rl_char_is_quoted_p = char_is_quoted;
/* Add some default bindings for the "shellwords" functions, roughly
parallelling the default word bindings in emacs mode. */
rl_bind_key_if_unbound_in_map (CTRL ('B'), bash_backward_shellword,
emacs_meta_keymap);
rl_bind_key_if_unbound_in_map (CTRL ('D'), bash_kill_shellword,
emacs_meta_keymap);
rl_bind_key_if_unbound_in_map (CTRL ('F'), bash_forward_shellword,
emacs_meta_keymap);
rl_bind_key_if_unbound_in_map (CTRL ('T'), bash_transpose_shellwords,
emacs_meta_keymap);
#if 0
/* This is superfluous and makes it impossible to use tab completion in
vi mode even when explicitly binding it in ~/.inputrc. sv_strict_posix()
should already have called posix_readline_initialize() when
posixly_correct was set. */
if (posixly_correct)
posix_readline_initialize (1);
#endif
bash_readline_initialized = true;
}
void
Shell::bashline_reinitialize ()
{
bash_readline_initialized = false;
}
void
Shell::bashline_set_event_hook ()
{
rl_signal_event_hook = bash_event_hook;
}
void
Shell::bashline_reset_event_hook ()
{
rl_signal_event_hook = 0;
}
/* On Sun systems at least, rl_attempted_completion_function can end up
getting set to NULL, and rl_completion_entry_function set to do command
word completion if Bash is interrupted while trying to complete a command
word. This just resets all the completion functions to the right thing.
It's called from throw_to_top_level(). */
void
Shell::bashline_reset ()
{
tilde_initialize ();
rl_attempted_completion_function = attempt_shell_completion;
rl_completion_entry_function = NULL;
rl_ignore_some_completions_function = filename_completion_ignore;
complete_fullquote = 1;
rl_filename_quote_characters = default_filename_quote_characters;
set_filename_bstab (rl_filename_quote_characters);
set_directory_hook ();
rl_filename_stat_hook = bash_filename_stat_hook;
bashline_reset_event_hook ();
rl_sort_completion_matches = 1;
}
/* Contains the line to push into readline. */
// static char *push_to_readline = (char *)NULL;
/* Push the contents of push_to_readline into the
readline buffer. */
int
Shell::bash_push_line ()
{
if (push_to_readline)
{
rl_insert_text (push_to_readline);
free (push_to_readline);
push_to_readline = (char *)NULL;
rl_startup_hook = old_rl_startup_hook;
}
return 0;
}
/* Call this to set the initial text for the next line to read
from readline. */
int
Shell::bash_re_edit (const char *line)
{
FREE (push_to_readline);
push_to_readline = savestring (line);
old_rl_startup_hook = rl_startup_hook;
rl_startup_hook = bash_push_line;
return 0;
}
int
Shell::display_shell_version (int count, int c)
{
rl_crlf ();
show_shell_version (0);
putc ('\r', rl_outstream);
fflush (rl_outstream);
rl_on_new_line ();
rl_redisplay ();
return 0;
}
/* **************************************************************** */
/* */
/* Readline Stuff */
/* */
/* **************************************************************** */
/* If the user requests hostname completion, then simply build a list
of hosts, and complete from that forever more, or at least until
HOSTFILE is unset. */
#if 0
/* THIS SHOULD BE A STRINGLIST. */
/* The kept list of hostnames. */
static char **hostname_list = (char **)NULL;
/* The physical size of the above list. */
static int hostname_list_size;
/* The number of hostnames in the above list. */
static int hostname_list_length;
/* Whether or not HOSTNAME_LIST has been initialized. */
bool hostname_list_initialized = false;
#endif
/* Initialize the hostname completion table. */
void
Shell::initialize_hostname_list ()
{
const char *temp;
temp = get_string_value ("HOSTFILE");
if (temp == 0)
temp = get_string_value ("hostname_completion_file");
if (temp == 0)
temp = DEFAULT_HOSTS_FILE;
snarf_hosts_from_file (temp);
if (hostname_list)
hostname_list_initialized = true;
}
/* Add NAME to the list of hosts. */
void
Shell::add_host_name (char *name)
{
if (hostname_list_length + 2 > hostname_list_size)
{
hostname_list_size
= (hostname_list_size + 32) - (hostname_list_size % 32);
hostname_list = strvec_resize (hostname_list, hostname_list_size);
}
hostname_list[hostname_list_length++] = savestring (name);
hostname_list[hostname_list_length] = (char *)NULL;
}
#define cr_whitespace(c) ((c) == '\r' || (c) == '\n' || whitespace (c))
void
Shell::snarf_hosts_from_file (const char *filename)
{
char *temp, buffer[256], name[256];
FILE *file = fopen (filename, "r");
if (file == 0)
return;
while ((temp = fgets (buffer, 255, file)))
{
/* Skip to first character. */
int i;
for (i = 0; buffer[i] && cr_whitespace (buffer[i]); i++)
;
/* If comment or blank line, ignore. */
if (buffer[i] == '\0' || buffer[i] == '#')
continue;
/* If `preprocessor' directive, do the include. */
if (strncmp (buffer + i, "$include ", 9) == 0)
{
char *incfile, *t;
/* Find start of filename. */
for (incfile = buffer + i + 9; *incfile && whitespace (*incfile);
incfile++)
;
/* Find end of filename. */
for (t = incfile; *t && cr_whitespace (*t) == 0; t++)
;
*t = '\0';
snarf_hosts_from_file (incfile);
continue;
}
/* Skip internet address if present. */
if (DIGIT (buffer[i]))
for (; buffer[i] && cr_whitespace (buffer[i]) == 0; i++)
;
/* Gobble up names. Each name is separated with whitespace. */
while (buffer[i])
{
for (; cr_whitespace (buffer[i]); i++)
;
if (buffer[i] == '\0' || buffer[i] == '#')
break;
/* Isolate the current word. */
int start;
for (start = i; buffer[i] && cr_whitespace (buffer[i]) == 0; i++)
;
if (i == start)
continue;
strncpy (name, buffer + start, i - start);
name[i - start] = '\0';
add_host_name (name);
}
}
fclose (file);
}
/* Return the hostname list. */
char **
Shell::get_hostname_list ()
{
if (hostname_list_initialized == 0)
initialize_hostname_list ();
return hostname_list;
}
void
Shell::clear_hostname_list ()
{
if (hostname_list_initialized == 0)
return;
for (int i = 0; i < hostname_list_length; i++)
delete[] hostname_list[i];
hostname_list_length = hostname_list_initialized = 0;
}
/* Return a NULL terminated list of hostnames which begin with TEXT.
Initialize the hostname list the first time if necessary.
The array is malloc ()'ed, but not the individual strings. */
char **
Shell::hostnames_matching (char *text)
{
char **result;
if (hostname_list_initialized == 0)
initialize_hostname_list ();
if (hostname_list_initialized == 0)
return (char **)NULL;
/* Special case. If TEXT consists of nothing, then the whole list is
what is desired. */
if (*text == '\0')
{
result = strvec_create (1 + hostname_list_length);
int i;
for (i = 0; i < hostname_list_length; i++)
result[i] = hostname_list[i];
result[i] = (char *)NULL;
return result;
}
/* Scan until found, or failure. */
int len = strlen (text);
result = (char **)NULL;
int i, nmatch, rsize;
for (i = nmatch = rsize = 0; i < hostname_list_length; i++)
{
if (STREQN (text, hostname_list[i], len) == 0)
continue;
/* OK, it matches. Add it to the list. */
if (nmatch >= (rsize - 1))
{
rsize = (rsize + 16) - (rsize % 16);
result = strvec_resize (result, rsize);
}
result[nmatch++] = hostname_list[i];
}
if (nmatch)
result[nmatch] = (char *)NULL;
return result;
}
/* This vi mode command causes VI_EDIT_COMMAND to be run on the current
command being entered (if no explicit argument is given), otherwise on
a command from the history file. */
#define VI_EDIT_COMMAND "fc -e \"${VISUAL:-${EDITOR:-vi}}\""
#define EMACS_EDIT_COMMAND "fc -e \"${VISUAL:-${EDITOR:-emacs}}\""
#define POSIX_VI_EDIT_COMMAND "fc -e vi"
int
Shell::edit_and_execute_command (int count, int c, int editing_mode,
const char *edit_command)
{
char *command;
int r, rrs, metaflag;
ShellParserState ps;
rrs = rl_readline_state;
saved_command_line_count = current_command_line_count;
/* Accept the current line. */
rl_newline (1, c);
if (rl_explicit_arg)
{
command = (char *)xmalloc (strlen (edit_command) + 8);
sprintf (command, "%s %d", edit_command, count);
}
else
{
/* Take the command we were just editing, add it to the history file,
then call fc to operate on it. We have to add a dummy command to
the end of the history because fc ignores the last command (assumes
it's supposed to deal with the command before the `fc'). */
/* This breaks down when using command-oriented history and are not
finished with the command, so we should not ignore the last command */
using_history ();
current_command_line_count++; /* for rl_newline above */
bash_add_history (rl_line_buffer);
current_command_line_count = 0; /* for dummy history entry */
bash_add_history ("");
history_lines_this_session++;
using_history ();
command = savestring (edit_command);
}
const char *metaval = rl_variable_value ("input-meta");
metaflag = RL_BOOLEAN_VARIABLE_VALUE (metaval);
if (rl_deprep_term_function)
(*rl_deprep_term_function) ();
rl_clear_signals ();
save_parser_state (&ps);
r = parse_and_execute (command,
(editing_mode == VI_EDITING_MODE) ? "v" : "C-xC-e",
SEVAL_NOHIST);
restore_parser_state (&ps);
/* if some kind of reset_parser was called, undo it. */
reset_readahead_token ();
if (rl_prep_term_function)
(*rl_prep_term_function) (metaflag);
rl_set_signals ();
current_command_line_count = saved_command_line_count;