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freebsd-dev/contrib/libreadline/readline.c
Andrey A. Chernov 91d01d1fdf V2.2 import
1998-04-28 06:22:20 +00:00

2104 lines
47 KiB
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/* readline.c -- a general facility for reading lines of input
with emacs style editing and completion. */
/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
This file is part of the GNU Readline Library, a library for
reading lines of text with interactive input and history editing.
The GNU Readline Library 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.
The GNU Readline Library 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.
The GNU General Public License is often shipped with GNU software, and
is generally kept in a file called COPYING or LICENSE. If you do not
have a copy of the license, write to the Free Software Foundation,
675 Mass Ave, Cambridge, MA 02139, USA. */
#define READLINE_LIBRARY
#if defined (HAVE_CONFIG_H)
# include <config.h>
#endif
#include <sys/types.h>
#include "posixstat.h"
#include <fcntl.h>
#if defined (HAVE_SYS_FILE_H)
# include <sys/file.h>
#endif /* HAVE_SYS_FILE_H */
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if defined (HAVE_STDLIB_H)
# include <stdlib.h>
#else
# include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */
#if defined (HAVE_LOCALE_H)
# include <locale.h>
#endif
#include <signal.h>
#include <stdio.h>
#include "posixjmp.h"
/* System-specific feature definitions and include files. */
#include "rldefs.h"
#if defined (__EMX__)
# define INCL_DOSPROCESS
# include <os2.h>
#endif /* __EMX__ */
/* Some standard library routines. */
#include "readline.h"
#include "history.h"
#ifndef RL_LIBRARY_VERSION
# define RL_LIBRARY_VERSION "2.2-bash"
#endif
/* Evaluates its arguments multiple times. */
#define SWAP(s, e) do { int t; t = s; s = e; e = t; } while (0)
/* NOTE: Functions and variables prefixed with `_rl_' are
pseudo-global: they are global so they can be shared
between files in the readline library, but are not intended
to be visible to readline callers. */
/* Variables and functions imported from terminal.c */
extern int _rl_init_terminal_io ();
extern void _rl_enable_meta_key ();
#ifdef _MINIX
extern void _rl_output_character_function ();
#else
extern int _rl_output_character_function ();
#endif
extern void _rl_get_screen_size ();
extern int _rl_enable_meta;
extern int _rl_term_autowrap;
extern int screenwidth, screenheight, screenchars;
/* Variables and functions imported from rltty.c. */
extern void rl_prep_terminal (), rl_deprep_terminal ();
extern void rltty_set_default_bindings ();
/* Functions imported from util.c. */
extern void _rl_abort_internal ();
extern void rl_extend_line_buffer ();
extern int alphabetic ();
/* Functions imported from bind.c. */
extern void _rl_bind_if_unbound ();
extern int rl_set_keymap_from_edit_mode ();
/* Functions imported from input.c. */
extern int _rl_any_typein ();
extern void _rl_insert_typein ();
extern int rl_read_key ();
/* Functions imported from nls.c */
extern int _rl_init_eightbit ();
/* Functions imported from shell.c */
extern char *get_env_value ();
/* External redisplay functions and variables from display.c */
extern void _rl_move_vert ();
extern void _rl_update_final ();
extern void _rl_clear_to_eol ();
extern void _rl_clear_screen ();
extern void _rl_save_prompt ();
extern void _rl_restore_prompt ();
extern void _rl_erase_at_end_of_line ();
extern void _rl_move_cursor_relative ();
extern int _rl_vis_botlin;
extern int _rl_last_c_pos;
extern int _rl_horizontal_scroll_mode;
extern int rl_display_fixed;
extern int _rl_suppress_redisplay;
extern char *rl_display_prompt;
/* Variables imported from complete.c. */
extern char *rl_completer_word_break_characters;
extern char *rl_basic_word_break_characters;
extern int rl_completion_query_items;
extern int rl_complete_with_tilde_expansion;
/* Variables and functions from macro.c. */
extern void _rl_add_macro_char ();
extern void _rl_with_macro_input ();
extern int _rl_next_macro_key ();
extern int _rl_defining_kbd_macro;
#if defined (VI_MODE)
/* Functions imported from vi_mode.c. */
extern void _rl_vi_set_last ();
extern void _rl_vi_reset_last ();
extern void _rl_vi_done_inserting ();
extern int _rl_vi_textmod_command ();
extern void _rl_vi_initialize_line ();
#endif /* VI_MODE */
extern UNDO_LIST *rl_undo_list;
extern int _rl_doing_an_undo;
/* Forward declarations used in this file. */
void _rl_free_history_entry ();
int _rl_dispatch ();
int _rl_init_argument ();
static char *readline_internal ();
static void readline_initialize_everything ();
static void start_using_history ();
static void bind_arrow_keys ();
#if !defined (__GO32__)
static void readline_default_bindings ();
#endif /* !__GO32__ */
#if defined (__GO32__)
# include <go32.h>
# include <pc.h>
# undef HANDLE_SIGNALS
#endif /* __GO32__ */
extern char *xmalloc (), *xrealloc ();
/* **************************************************************** */
/* */
/* Line editing input utility */
/* */
/* **************************************************************** */
char *rl_library_version = RL_LIBRARY_VERSION;
/* A pointer to the keymap that is currently in use.
By default, it is the standard emacs keymap. */
Keymap _rl_keymap = emacs_standard_keymap;
/* The current style of editing. */
int rl_editing_mode = emacs_mode;
/* Non-zero if we called this function from _rl_dispatch(). It's present
so functions can find out whether they were called from a key binding
or directly from an application. */
int rl_dispatching;
/* Non-zero if the previous command was a kill command. */
int _rl_last_command_was_kill = 0;
/* The current value of the numeric argument specified by the user. */
int rl_numeric_arg = 1;
/* Non-zero if an argument was typed. */
int rl_explicit_arg = 0;
/* Temporary value used while generating the argument. */
int rl_arg_sign = 1;
/* Non-zero means we have been called at least once before. */
static int rl_initialized;
/* If non-zero, this program is running in an EMACS buffer. */
static int running_in_emacs;
/* The current offset in the current input line. */
int rl_point;
/* Mark in the current input line. */
int rl_mark;
/* Length of the current input line. */
int rl_end;
/* Make this non-zero to return the current input_line. */
int rl_done;
/* The last function executed by readline. */
Function *rl_last_func = (Function *)NULL;
/* Top level environment for readline_internal (). */
procenv_t readline_top_level;
/* The streams we interact with. */
FILE *_rl_in_stream, *_rl_out_stream;
/* The names of the streams that we do input and output to. */
FILE *rl_instream = (FILE *)NULL;
FILE *rl_outstream = (FILE *)NULL;
/* Non-zero means echo characters as they are read. */
int readline_echoing_p = 1;
/* Current prompt. */
char *rl_prompt;
int rl_visible_prompt_length = 0;
/* The number of characters read in order to type this complete command. */
int rl_key_sequence_length = 0;
/* If non-zero, then this is the address of a function to call just
before readline_internal () prints the first prompt. */
Function *rl_startup_hook = (Function *)NULL;
/* What we use internally. You should always refer to RL_LINE_BUFFER. */
static char *the_line;
/* The character that can generate an EOF. Really read from
the terminal driver... just defaulted here. */
int _rl_eof_char = CTRL ('D');
/* Non-zero makes this the next keystroke to read. */
int rl_pending_input = 0;
/* Pointer to a useful terminal name. */
char *rl_terminal_name = (char *)NULL;
/* Non-zero means to always use horizontal scrolling in line display. */
int _rl_horizontal_scroll_mode = 0;
/* Non-zero means to display an asterisk at the starts of history lines
which have been modified. */
int _rl_mark_modified_lines = 0;
/* The style of `bell' notification preferred. This can be set to NO_BELL,
AUDIBLE_BELL, or VISIBLE_BELL. */
int _rl_bell_preference = AUDIBLE_BELL;
/* String inserted into the line by rl_insert_comment (). */
char *_rl_comment_begin;
/* Keymap holding the function currently being executed. */
Keymap rl_executing_keymap;
/* Line buffer and maintenence. */
char *rl_line_buffer = (char *)NULL;
int rl_line_buffer_len = 0;
/* Forward declarations used by the display and termcap code. */
/* **************************************************************** */
/* */
/* `Forward' declarations */
/* */
/* **************************************************************** */
/* Non-zero means do not parse any lines other than comments and
parser directives. */
unsigned char _rl_parsing_conditionalized_out = 0;
/* Non-zero means to convert characters with the meta bit set to
escape-prefixed characters so we can indirect through
emacs_meta_keymap or vi_escape_keymap. */
int _rl_convert_meta_chars_to_ascii = 1;
/* Non-zero means to output characters with the meta bit set directly
rather than as a meta-prefixed escape sequence. */
int _rl_output_meta_chars = 0;
/* **************************************************************** */
/* */
/* Top Level Functions */
/* */
/* **************************************************************** */
/* Non-zero means treat 0200 bit in terminal input as Meta bit. */
int _rl_meta_flag = 0; /* Forward declaration */
/* Read a line of input. Prompt with PROMPT. An empty PROMPT means
none. A return value of NULL means that EOF was encountered. */
char *
readline (prompt)
char *prompt;
{
char *value;
rl_prompt = prompt;
/* If we are at EOF return a NULL string. */
if (rl_pending_input == EOF)
{
rl_pending_input = 0;
return ((char *)NULL);
}
rl_visible_prompt_length = rl_expand_prompt (rl_prompt);
rl_initialize ();
(*rl_prep_term_function) (_rl_meta_flag);
#if defined (HANDLE_SIGNALS)
rl_set_signals ();
#endif
value = readline_internal ();
(*rl_deprep_term_function) ();
#if defined (HANDLE_SIGNALS)
rl_clear_signals ();
#endif
return (value);
}
#if defined (READLINE_CALLBACKS)
# define STATIC_CALLBACK
#else
# define STATIC_CALLBACK static
#endif
STATIC_CALLBACK void
readline_internal_setup ()
{
_rl_in_stream = rl_instream;
_rl_out_stream = rl_outstream;
if (rl_startup_hook)
(*rl_startup_hook) ();
if (readline_echoing_p == 0)
{
if (rl_prompt)
{
fprintf (_rl_out_stream, "%s", rl_prompt);
fflush (_rl_out_stream);
}
}
else
{
rl_on_new_line ();
(*rl_redisplay_function) ();
#if defined (VI_MODE)
if (rl_editing_mode == vi_mode)
rl_vi_insertion_mode (1, 0);
#endif /* VI_MODE */
}
}
STATIC_CALLBACK char *
readline_internal_teardown (eof)
int eof;
{
char *temp;
HIST_ENTRY *entry;
/* Restore the original of this history line, iff the line that we
are editing was originally in the history, AND the line has changed. */
entry = current_history ();
if (entry && rl_undo_list)
{
temp = savestring (the_line);
rl_revert_line (1, 0);
entry = replace_history_entry (where_history (), the_line, (HIST_ENTRY *)NULL);
_rl_free_history_entry (entry);
strcpy (the_line, temp);
free (temp);
}
/* At any rate, it is highly likely that this line has an undo list. Get
rid of it now. */
if (rl_undo_list)
free_undo_list ();
return (eof ? (char *)NULL : savestring (the_line));
}
STATIC_CALLBACK int
#if defined (READLINE_CALLBACKS)
readline_internal_char ()
#else
readline_internal_charloop ()
#endif
{
static int lastc, eof_found;
int c, code, lk;
lastc = -1;
eof_found = 0;
#if !defined (READLINE_CALLBACKS)
while (rl_done == 0)
{
#endif
lk = _rl_last_command_was_kill;
code = setjmp (readline_top_level);
if (code)
(*rl_redisplay_function) ();
if (rl_pending_input == 0)
{
/* Then initialize the argument and number of keys read. */
_rl_init_argument ();
rl_key_sequence_length = 0;
}
c = rl_read_key ();
/* EOF typed to a non-blank line is a <NL>. */
if (c == EOF && rl_end)
c = NEWLINE;
/* The character _rl_eof_char typed to blank line, and not as the
previous character is interpreted as EOF. */
if (((c == _rl_eof_char && lastc != c) || c == EOF) && !rl_end)
{
#if defined (READLINE_CALLBACKS)
return (rl_done = 1);
#else
eof_found = 1;
break;
#endif
}
lastc = c;
_rl_dispatch (c, _rl_keymap);
/* If there was no change in _rl_last_command_was_kill, then no kill
has taken place. Note that if input is pending we are reading
a prefix command, so nothing has changed yet. */
if (rl_pending_input == 0 && lk == _rl_last_command_was_kill)
_rl_last_command_was_kill = 0;
#if defined (VI_MODE)
/* In vi mode, when you exit insert mode, the cursor moves back
over the previous character. We explicitly check for that here. */
if (rl_editing_mode == vi_mode && _rl_keymap == vi_movement_keymap)
rl_vi_check ();
#endif /* VI_MODE */
if (rl_done == 0)
(*rl_redisplay_function) ();
#if defined (READLINE_CALLBACKS)
return 0;
#else
}
return (eof_found);
#endif
}
#if defined (READLINE_CALLBACKS)
static int
readline_internal_charloop ()
{
int eof;
while (rl_done == 0)
eof = readline_internal_char ();
return (eof);
}
#endif /* READLINE_CALLBACKS */
/* Read a line of input from the global rl_instream, doing output on
the global rl_outstream.
If rl_prompt is non-null, then that is our prompt. */
static char *
readline_internal ()
{
int eof;
readline_internal_setup ();
eof = readline_internal_charloop ();
return (readline_internal_teardown (eof));
}
void
_rl_init_line_state ()
{
rl_point = rl_end = 0;
the_line = rl_line_buffer;
the_line[0] = 0;
}
void
_rl_set_the_line ()
{
the_line = rl_line_buffer;
}
/* Do the command associated with KEY in MAP.
If the associated command is really a keymap, then read
another key, and dispatch into that map. */
int
_rl_dispatch (key, map)
register int key;
Keymap map;
{
int r, newkey;
char *macro;
Function *func;
if (META_CHAR (key) && _rl_convert_meta_chars_to_ascii)
{
if (map[ESC].type == ISKMAP)
{
if (_rl_defining_kbd_macro)
_rl_add_macro_char (ESC);
map = FUNCTION_TO_KEYMAP (map, ESC);
key = UNMETA (key);
rl_key_sequence_length += 2;
return (_rl_dispatch (key, map));
}
else
ding ();
return 0;
}
if (_rl_defining_kbd_macro)
_rl_add_macro_char (key);
r = 0;
switch (map[key].type)
{
case ISFUNC:
func = map[key].function;
if (func != (Function *)NULL)
{
/* Special case rl_do_lowercase_version (). */
if (func == rl_do_lowercase_version)
return (_rl_dispatch (_rl_to_lower (key), map));
rl_executing_keymap = map;
#if 0
_rl_suppress_redisplay = (map[key].function == rl_insert) && _rl_input_available ();
#endif
rl_dispatching = 1;
r = (*map[key].function)(rl_numeric_arg * rl_arg_sign, key);
rl_dispatching = 0;
/* If we have input pending, then the last command was a prefix
command. Don't change the state of rl_last_func. Otherwise,
remember the last command executed in this variable. */
if (!rl_pending_input && map[key].function != rl_digit_argument)
rl_last_func = map[key].function;
}
else
{
_rl_abort_internal ();
return -1;
}
break;
case ISKMAP:
if (map[key].function != (Function *)NULL)
{
rl_key_sequence_length++;
newkey = rl_read_key ();
r = _rl_dispatch (newkey, FUNCTION_TO_KEYMAP (map, key));
}
else
{
_rl_abort_internal ();
return -1;
}
break;
case ISMACR:
if (map[key].function != (Function *)NULL)
{
macro = savestring ((char *)map[key].function);
_rl_with_macro_input (macro);
return 0;
}
break;
}
#if defined (VI_MODE)
if (rl_editing_mode == vi_mode && _rl_keymap == vi_movement_keymap &&
_rl_vi_textmod_command (key))
_rl_vi_set_last (key, rl_numeric_arg, rl_arg_sign);
#endif
return (r);
}
/* **************************************************************** */
/* */
/* Initializations */
/* */
/* **************************************************************** */
/* Initialize readline (and terminal if not already). */
int
rl_initialize ()
{
/* If we have never been called before, initialize the
terminal and data structures. */
if (!rl_initialized)
{
readline_initialize_everything ();
rl_initialized++;
}
/* Initalize the current line information. */
_rl_init_line_state ();
/* We aren't done yet. We haven't even gotten started yet! */
rl_done = 0;
/* Tell the history routines what is going on. */
start_using_history ();
/* Make the display buffer match the state of the line. */
rl_reset_line_state ();
/* No such function typed yet. */
rl_last_func = (Function *)NULL;
/* Parsing of key-bindings begins in an enabled state. */
_rl_parsing_conditionalized_out = 0;
#if defined (VI_MODE)
if (rl_editing_mode == vi_mode)
_rl_vi_initialize_line ();
#endif
return 0;
}
#if defined (__EMX__)
static void
_emx_build_environ ()
{
TIB *tibp;
PIB *pibp;
char *t, **tp;
int c;
DosGetInfoBlocks (&tibp, &pibp);
t = pibp->pib_pchenv;
for (c = 1; *t; c++)
t += strlen (t) + 1;
tp = environ = (char **)xmalloc ((c + 1) * sizeof (char *));
t = pibp->pib_pchenv;
while (*t)
{
*tp++ = t;
t += strlen (t) + 1;
}
*tp = 0;
}
#endif /* __EMX__ */
/* Initialize the entire state of the world. */
static void
readline_initialize_everything ()
{
#if defined (__EMX__)
if (environ == 0)
_emx_build_environ ();
#endif
/* Find out if we are running in Emacs. */
running_in_emacs = get_env_value ("EMACS") != (char *)0;
/* Set up input and output if they are not already set up. */
if (!rl_instream)
rl_instream = stdin;
if (!rl_outstream)
rl_outstream = stdout;
/* Bind _rl_in_stream and _rl_out_stream immediately. These values
may change, but they may also be used before readline_internal ()
is called. */
_rl_in_stream = rl_instream;
_rl_out_stream = rl_outstream;
/* Allocate data structures. */
if (rl_line_buffer == 0)
rl_line_buffer = xmalloc (rl_line_buffer_len = DEFAULT_BUFFER_SIZE);
/* Initialize the terminal interface. */
_rl_init_terminal_io ((char *)NULL);
#if !defined (__GO32__)
/* Bind tty characters to readline functions. */
readline_default_bindings ();
#endif /* !__GO32__ */
/* Initialize the function names. */
rl_initialize_funmap ();
/* Decide whether we should automatically go into eight-bit mode. */
_rl_init_eightbit ();
/* Read in the init file. */
rl_read_init_file ((char *)NULL);
/* XXX */
if (_rl_horizontal_scroll_mode && _rl_term_autowrap)
{
screenwidth--;
screenchars -= screenheight;
}
/* Override the effect of any `set keymap' assignments in the
inputrc file. */
rl_set_keymap_from_edit_mode ();
/* Try to bind a common arrow key prefix, if not already bound. */
bind_arrow_keys ();
/* Enable the meta key, if this terminal has one. */
if (_rl_enable_meta)
_rl_enable_meta_key ();
/* If the completion parser's default word break characters haven't
been set yet, then do so now. */
if (rl_completer_word_break_characters == (char *)NULL)
rl_completer_word_break_characters = rl_basic_word_break_characters;
}
/* If this system allows us to look at the values of the regular
input editing characters, then bind them to their readline
equivalents, iff the characters are not bound to keymaps. */
static void
readline_default_bindings ()
{
rltty_set_default_bindings (_rl_keymap);
}
static void
bind_arrow_keys_internal ()
{
Function *f;
f = rl_function_of_keyseq ("\033[A", _rl_keymap, (int *)NULL);
if (!f || f == rl_do_lowercase_version)
{
_rl_bind_if_unbound ("\033[A", rl_get_previous_history);
_rl_bind_if_unbound ("\033[B", rl_get_next_history);
_rl_bind_if_unbound ("\033[C", rl_forward);
_rl_bind_if_unbound ("\033[D", rl_backward);
}
f = rl_function_of_keyseq ("\033OA", _rl_keymap, (int *)NULL);
if (!f || f == rl_do_lowercase_version)
{
_rl_bind_if_unbound ("\033OA", rl_get_previous_history);
_rl_bind_if_unbound ("\033OB", rl_get_next_history);
_rl_bind_if_unbound ("\033OC", rl_forward);
_rl_bind_if_unbound ("\033OD", rl_backward);
}
}
/* Try and bind the common arrow key prefix after giving termcap and
the inputrc file a chance to bind them and create `real' keymaps
for the arrow key prefix. */
static void
bind_arrow_keys ()
{
Keymap xkeymap;
xkeymap = _rl_keymap;
_rl_keymap = emacs_standard_keymap;
bind_arrow_keys_internal ();
#if defined (VI_MODE)
_rl_keymap = vi_movement_keymap;
bind_arrow_keys_internal ();
#endif
_rl_keymap = xkeymap;
}
/* **************************************************************** */
/* */
/* Numeric Arguments */
/* */
/* **************************************************************** */
/* Handle C-u style numeric args, as well as M--, and M-digits. */
static int
rl_digit_loop ()
{
int key, c, sawminus, sawdigits;
_rl_save_prompt ();
sawminus = sawdigits = 0;
while (1)
{
rl_message ("(arg: %d) ", rl_arg_sign * rl_numeric_arg);
key = c = rl_read_key ();
/* If we see a key bound to `universal-argument' after seeing digits,
it ends the argument but is otherwise ignored. */
if (_rl_keymap[c].type == ISFUNC &&
_rl_keymap[c].function == rl_universal_argument)
{
if (sawdigits == 0)
{
rl_numeric_arg *= 4;
continue;
}
else
{
key = rl_read_key ();
_rl_restore_prompt ();
rl_clear_message ();
return (_rl_dispatch (key, _rl_keymap));
}
}
c = UNMETA (c);
if (_rl_digit_p (c))
{
rl_numeric_arg = rl_explicit_arg ? (rl_numeric_arg * 10) + c - '0' : c - '0';
sawdigits = rl_explicit_arg = 1;
}
else if (c == '-' && rl_explicit_arg == 0)
{
rl_numeric_arg = sawminus = 1;
rl_arg_sign = -1;
}
else
{
/* Make M-- command equivalent to M--1 command. */
if (sawminus && rl_numeric_arg == 1 && rl_explicit_arg == 0)
rl_explicit_arg = 1;
_rl_restore_prompt ();
rl_clear_message ();
return (_rl_dispatch (key, _rl_keymap));
}
}
return 0;
}
/* Add the current digit to the argument in progress. */
int
rl_digit_argument (ignore, key)
int ignore, key;
{
rl_pending_input = key;
return (rl_digit_loop ());
}
/* What to do when you abort reading an argument. */
int
rl_discard_argument ()
{
ding ();
rl_clear_message ();
_rl_init_argument ();
return 0;
}
/* Create a default argument. */
int
_rl_init_argument ()
{
rl_numeric_arg = rl_arg_sign = 1;
rl_explicit_arg = 0;
return 0;
}
/* C-u, universal argument. Multiply the current argument by 4.
Read a key. If the key has nothing to do with arguments, then
dispatch on it. If the key is the abort character then abort. */
int
rl_universal_argument (count, key)
int count, key;
{
rl_numeric_arg *= 4;
return (rl_digit_loop ());
}
/* **************************************************************** */
/* */
/* Insert and Delete */
/* */
/* **************************************************************** */
/* Insert a string of text into the line at point. This is the only
way that you should do insertion. rl_insert () calls this
function. */
int
rl_insert_text (string)
char *string;
{
register int i, l = strlen (string);
if (rl_end + l >= rl_line_buffer_len)
rl_extend_line_buffer (rl_end + l);
for (i = rl_end; i >= rl_point; i--)
the_line[i + l] = the_line[i];
strncpy (the_line + rl_point, string, l);
/* Remember how to undo this if we aren't undoing something. */
if (!_rl_doing_an_undo)
{
/* If possible and desirable, concatenate the undos. */
if ((l == 1) &&
rl_undo_list &&
(rl_undo_list->what == UNDO_INSERT) &&
(rl_undo_list->end == rl_point) &&
(rl_undo_list->end - rl_undo_list->start < 20))
rl_undo_list->end++;
else
rl_add_undo (UNDO_INSERT, rl_point, rl_point + l, (char *)NULL);
}
rl_point += l;
rl_end += l;
the_line[rl_end] = '\0';
return l;
}
/* Delete the string between FROM and TO. FROM is
inclusive, TO is not. */
int
rl_delete_text (from, to)
int from, to;
{
register char *text;
register int diff, i;
/* Fix it if the caller is confused. */
if (from > to)
SWAP (from, to);
/* fix boundaries */
if (to > rl_end)
{
to = rl_end;
if (from > to)
from = to;
}
text = rl_copy_text (from, to);
/* Some versions of strncpy() can't handle overlapping arguments. */
diff = to - from;
for (i = from; i < rl_end - diff; i++)
the_line[i] = the_line[i + diff];
/* Remember how to undo this delete. */
if (_rl_doing_an_undo == 0)
rl_add_undo (UNDO_DELETE, from, to, text);
else
free (text);
rl_end -= diff;
the_line[rl_end] = '\0';
return (diff);
}
/* Fix up point so that it is within the line boundaries after killing
text. If FIX_MARK_TOO is non-zero, the mark is forced within line
boundaries also. */
#define _RL_FIX_POINT(x) \
do { \
if (x > rl_end) \
x = rl_end; \
else if (x < 0) \
x = 0; \
} while (0)
void
_rl_fix_point (fix_mark_too)
int fix_mark_too;
{
_RL_FIX_POINT (rl_point);
if (fix_mark_too)
_RL_FIX_POINT (rl_mark);
}
#undef _RL_FIX_POINT
void
_rl_replace_text (text, start, end)
char *text;
int start, end;
{
rl_begin_undo_group ();
rl_delete_text (start, end + 1);
rl_point = start;
rl_insert_text (text);
rl_end_undo_group ();
}
/* **************************************************************** */
/* */
/* Readline character functions */
/* */
/* **************************************************************** */
/* This is not a gap editor, just a stupid line input routine. No hair
is involved in writing any of the functions, and none should be. */
/* Note that:
rl_end is the place in the string that we would place '\0';
i.e., it is always safe to place '\0' there.
rl_point is the place in the string where the cursor is. Sometimes
this is the same as rl_end.
Any command that is called interactively receives two arguments.
The first is a count: the numeric arg pased to this command.
The second is the key which invoked this command.
*/
/* **************************************************************** */
/* */
/* Movement Commands */
/* */
/* **************************************************************** */
/* Note that if you `optimize' the display for these functions, you cannot
use said functions in other functions which do not do optimizing display.
I.e., you will have to update the data base for rl_redisplay, and you
might as well let rl_redisplay do that job. */
/* Move forward COUNT characters. */
int
rl_forward (count, key)
int count, key;
{
if (count < 0)
rl_backward (-count, key);
else if (count > 0)
{
int end = rl_point + count;
#if defined (VI_MODE)
int lend = rl_end - (rl_editing_mode == vi_mode);
#else
int lend = rl_end;
#endif
if (end > lend)
{
rl_point = lend;
ding ();
}
else
rl_point = end;
}
return 0;
}
/* Move backward COUNT characters. */
int
rl_backward (count, key)
int count, key;
{
if (count < 0)
rl_forward (-count, key);
else if (count > 0)
{
if (rl_point < count)
{
rl_point = 0;
ding ();
}
else
rl_point -= count;
}
return 0;
}
/* Move to the beginning of the line. */
int
rl_beg_of_line (count, key)
int count, key;
{
rl_point = 0;
return 0;
}
/* Move to the end of the line. */
int
rl_end_of_line (count, key)
int count, key;
{
rl_point = rl_end;
return 0;
}
/* Move forward a word. We do what Emacs does. */
int
rl_forward_word (count, key)
int count, key;
{
int c;
if (count < 0)
{
rl_backward_word (-count, key);
return 0;
}
while (count)
{
if (rl_point == rl_end)
return 0;
/* If we are not in a word, move forward until we are in one.
Then, move forward until we hit a non-alphabetic character. */
c = the_line[rl_point];
if (alphabetic (c) == 0)
{
while (++rl_point < rl_end)
{
c = the_line[rl_point];
if (alphabetic (c))
break;
}
}
if (rl_point == rl_end)
return 0;
while (++rl_point < rl_end)
{
c = the_line[rl_point];
if (alphabetic (c) == 0)
break;
}
--count;
}
return 0;
}
/* Move backward a word. We do what Emacs does. */
int
rl_backward_word (count, key)
int count, key;
{
int c;
if (count < 0)
{
rl_forward_word (-count, key);
return 0;
}
while (count)
{
if (!rl_point)
return 0;
/* Like rl_forward_word (), except that we look at the characters
just before point. */
c = the_line[rl_point - 1];
if (alphabetic (c) == 0)
{
while (--rl_point)
{
c = the_line[rl_point - 1];
if (alphabetic (c))
break;
}
}
while (rl_point)
{
c = the_line[rl_point - 1];
if (alphabetic (c) == 0)
break;
else
--rl_point;
}
--count;
}
return 0;
}
/* Clear the current line. Numeric argument to C-l does this. */
int
rl_refresh_line ()
{
int curr_line, nleft;
/* Find out whether or not there might be invisible characters in the
editing buffer. */
if (rl_display_prompt == rl_prompt)
nleft = _rl_last_c_pos - screenwidth - rl_visible_prompt_length;
else
nleft = _rl_last_c_pos - screenwidth;
if (nleft > 0)
curr_line = 1 + nleft / screenwidth;
else
curr_line = 0;
_rl_move_vert (curr_line);
_rl_move_cursor_relative (0, the_line); /* XXX is this right */
#if defined (__GO32__)
{
int row, col, width, row_start;
ScreenGetCursor (&row, &col);
width = ScreenCols ();
row_start = ScreenPrimary + (row * width);
memset (row_start + col, 0, (width - col) * 2);
}
#else /* !__GO32__ */
_rl_clear_to_eol (0); /* arg of 0 means to not use spaces */
#endif /* !__GO32__ */
rl_forced_update_display ();
rl_display_fixed = 1;
return 0;
}
/* C-l typed to a line without quoting clears the screen, and then reprints
the prompt and the current input line. Given a numeric arg, redraw only
the current line. */
int
rl_clear_screen (count, key)
int count, key;
{
if (rl_explicit_arg)
{
rl_refresh_line ();
return 0;
}
_rl_clear_screen (); /* calls termcap function to clear screen */
rl_forced_update_display ();
rl_display_fixed = 1;
return 0;
}
int
rl_arrow_keys (count, c)
int count, c;
{
int ch;
ch = rl_read_key ();
switch (_rl_to_upper (ch))
{
case 'A':
rl_get_previous_history (count, ch);
break;
case 'B':
rl_get_next_history (count, ch);
break;
case 'C':
rl_forward (count, ch);
break;
case 'D':
rl_backward (count, ch);
break;
default:
ding ();
}
return 0;
}
/* **************************************************************** */
/* */
/* Text commands */
/* */
/* **************************************************************** */
/* Insert the character C at the current location, moving point forward. */
int
rl_insert (count, c)
int count, c;
{
register int i;
char *string;
if (count <= 0)
return 0;
/* If we can optimize, then do it. But don't let people crash
readline because of extra large arguments. */
if (count > 1 && count <= 1024)
{
string = xmalloc (1 + count);
for (i = 0; i < count; i++)
string[i] = c;
string[i] = '\0';
rl_insert_text (string);
free (string);
return 0;
}
if (count > 1024)
{
int decreaser;
char str[1024+1];
for (i = 0; i < 1024; i++)
str[i] = c;
while (count)
{
decreaser = (count > 1024 ? 1024 : count);
str[decreaser] = '\0';
rl_insert_text (str);
count -= decreaser;
}
return 0;
}
/* We are inserting a single character.
If there is pending input, then make a string of all of the
pending characters that are bound to rl_insert, and insert
them all. */
if (_rl_any_typein ())
_rl_insert_typein (c);
else
{
/* Inserting a single character. */
char str[2];
str[1] = '\0';
str[0] = c;
rl_insert_text (str);
}
return 0;
}
/* Insert the next typed character verbatim. */
int
rl_quoted_insert (count, key)
int count, key;
{
int c;
c = rl_read_key ();
return (rl_insert (count, c));
}
/* Insert a tab character. */
int
rl_tab_insert (count, key)
int count, key;
{
return (rl_insert (count, '\t'));
}
/* What to do when a NEWLINE is pressed. We accept the whole line.
KEY is the key that invoked this command. I guess it could have
meaning in the future. */
int
rl_newline (count, key)
int count, key;
{
rl_done = 1;
#if defined (VI_MODE)
if (rl_editing_mode == vi_mode)
{
_rl_vi_done_inserting ();
_rl_vi_reset_last ();
}
#endif /* VI_MODE */
if (readline_echoing_p)
_rl_update_final ();
return 0;
}
/* What to do for some uppercase characters, like meta characters,
and some characters appearing in emacs_ctlx_keymap. This function
is just a stub, you bind keys to it and the code in _rl_dispatch ()
is special cased. */
int
rl_do_lowercase_version (ignore1, ignore2)
int ignore1, ignore2;
{
return 0;
}
/* Rubout the character behind point. */
int
rl_rubout (count, key)
int count, key;
{
if (count < 0)
{
rl_delete (-count, key);
return 0;
}
if (!rl_point)
{
ding ();
return -1;
}
if (count > 1 || rl_explicit_arg)
{
int orig_point = rl_point;
rl_backward (count, key);
rl_kill_text (orig_point, rl_point);
}
else
{
int c = the_line[--rl_point];
rl_delete_text (rl_point, rl_point + 1);
if (rl_point == rl_end && isprint (c) && _rl_last_c_pos)
{
int l;
l = rl_character_len (c, rl_point);
_rl_erase_at_end_of_line (l);
}
}
return 0;
}
/* Delete the character under the cursor. Given a numeric argument,
kill that many characters instead. */
int
rl_delete (count, key)
int count, key;
{
if (count < 0)
return (rl_rubout (-count, key));
if (rl_point == rl_end)
{
ding ();
return -1;
}
if (count > 1 || rl_explicit_arg)
{
int orig_point = rl_point;
rl_forward (count, key);
rl_kill_text (orig_point, rl_point);
rl_point = orig_point;
return 0;
}
else
return (rl_delete_text (rl_point, rl_point + 1));
}
/* Delete all spaces and tabs around point. */
int
rl_delete_horizontal_space (count, ignore)
int count, ignore;
{
int start = rl_point;
while (rl_point && whitespace (the_line[rl_point - 1]))
rl_point--;
start = rl_point;
while (rl_point < rl_end && whitespace (the_line[rl_point]))
rl_point++;
if (start != rl_point)
{
rl_delete_text (start, rl_point);
rl_point = start;
}
return 0;
}
#ifndef RL_COMMENT_BEGIN_DEFAULT
#define RL_COMMENT_BEGIN_DEFAULT "#"
#endif
/* Turn the current line into a comment in shell history.
A K*rn shell style function. */
int
rl_insert_comment (count, key)
int count, key;
{
rl_beg_of_line (1, key);
rl_insert_text (_rl_comment_begin ? _rl_comment_begin
: RL_COMMENT_BEGIN_DEFAULT);
(*rl_redisplay_function) ();
rl_newline (1, '\n');
return (0);
}
/* **************************************************************** */
/* */
/* Changing Case */
/* */
/* **************************************************************** */
/* The three kinds of things that we know how to do. */
#define UpCase 1
#define DownCase 2
#define CapCase 3
static int rl_change_case ();
/* Uppercase the word at point. */
int
rl_upcase_word (count, key)
int count, key;
{
return (rl_change_case (count, UpCase));
}
/* Lowercase the word at point. */
int
rl_downcase_word (count, key)
int count, key;
{
return (rl_change_case (count, DownCase));
}
/* Upcase the first letter, downcase the rest. */
int
rl_capitalize_word (count, key)
int count, key;
{
return (rl_change_case (count, CapCase));
}
/* The meaty function.
Change the case of COUNT words, performing OP on them.
OP is one of UpCase, DownCase, or CapCase.
If a negative argument is given, leave point where it started,
otherwise, leave it where it moves to. */
static int
rl_change_case (count, op)
int count, op;
{
register int start, end;
int inword, c;
start = rl_point;
rl_forward_word (count, 0);
end = rl_point;
if (count < 0)
SWAP (start, end);
/* We are going to modify some text, so let's prepare to undo it. */
rl_modifying (start, end);
for (inword = 0; start < end; start++)
{
c = the_line[start];
switch (op)
{
case UpCase:
the_line[start] = _rl_to_upper (c);
break;
case DownCase:
the_line[start] = _rl_to_lower (c);
break;
case CapCase:
the_line[start] = (inword == 0) ? _rl_to_upper (c) : _rl_to_lower (c);
inword = alphabetic (the_line[start]);
break;
default:
ding ();
return -1;
}
}
rl_point = end;
return 0;
}
/* **************************************************************** */
/* */
/* Transposition */
/* */
/* **************************************************************** */
/* Transpose the words at point. */
int
rl_transpose_words (count, key)
int count, key;
{
char *word1, *word2;
int w1_beg, w1_end, w2_beg, w2_end;
int orig_point = rl_point;
if (!count)
return 0;
/* Find the two words. */
rl_forward_word (count, key);
w2_end = rl_point;
rl_backward_word (1, key);
w2_beg = rl_point;
rl_backward_word (count, key);
w1_beg = rl_point;
rl_forward_word (1, key);
w1_end = rl_point;
/* Do some check to make sure that there really are two words. */
if ((w1_beg == w2_beg) || (w2_beg < w1_end))
{
ding ();
rl_point = orig_point;
return -1;
}
/* Get the text of the words. */
word1 = rl_copy_text (w1_beg, w1_end);
word2 = rl_copy_text (w2_beg, w2_end);
/* We are about to do many insertions and deletions. Remember them
as one operation. */
rl_begin_undo_group ();
/* Do the stuff at word2 first, so that we don't have to worry
about word1 moving. */
rl_point = w2_beg;
rl_delete_text (w2_beg, w2_end);
rl_insert_text (word1);
rl_point = w1_beg;
rl_delete_text (w1_beg, w1_end);
rl_insert_text (word2);
/* This is exactly correct since the text before this point has not
changed in length. */
rl_point = w2_end;
/* I think that does it. */
rl_end_undo_group ();
free (word1);
free (word2);
return 0;
}
/* Transpose the characters at point. If point is at the end of the line,
then transpose the characters before point. */
int
rl_transpose_chars (count, key)
int count, key;
{
char dummy[2];
if (!count)
return 0;
if (!rl_point || rl_end < 2)
{
ding ();
return -1;
}
rl_begin_undo_group ();
if (rl_point == rl_end)
{
--rl_point;
count = 1;
}
rl_point--;
dummy[0] = the_line[rl_point];
dummy[1] = '\0';
rl_delete_text (rl_point, rl_point + 1);
rl_point += count;
_rl_fix_point (0);
rl_insert_text (dummy);
rl_end_undo_group ();
return 0;
}
/* **************************************************************** */
/* */
/* Character Searching */
/* */
/* **************************************************************** */
int
_rl_char_search_internal (count, dir, schar)
int count, dir, schar;
{
int pos, inc;
pos = rl_point;
inc = (dir < 0) ? -1 : 1;
while (count)
{
if ((dir < 0 && pos <= 0) || (dir > 0 && pos >= rl_end))
{
ding ();
return -1;
}
pos += inc;
do
{
if (rl_line_buffer[pos] == schar)
{
count--;
if (dir < 0)
rl_point = (dir == BTO) ? pos + 1 : pos;
else
rl_point = (dir == FTO) ? pos - 1 : pos;
break;
}
}
while ((dir < 0) ? pos-- : ++pos < rl_end);
}
return (0);
}
/* Search COUNT times for a character read from the current input stream.
FDIR is the direction to search if COUNT is non-negative; otherwise
the search goes in BDIR. */
static int
_rl_char_search (count, fdir, bdir)
int count, fdir, bdir;
{
int c;
c = rl_read_key ();
if (count < 0)
return (_rl_char_search_internal (-count, bdir, c));
else
return (_rl_char_search_internal (count, fdir, c));
}
int
rl_char_search (count, key)
int count, key;
{
return (_rl_char_search (count, FFIND, BFIND));
}
int
rl_backward_char_search (count, key)
int count, key;
{
return (_rl_char_search (count, BFIND, FFIND));
}
/* **************************************************************** */
/* */
/* History Utilities */
/* */
/* **************************************************************** */
/* We already have a history library, and that is what we use to control
the history features of readline. This is our local interface to
the history mechanism. */
/* While we are editing the history, this is the saved
version of the original line. */
HIST_ENTRY *saved_line_for_history = (HIST_ENTRY *)NULL;
/* Set the history pointer back to the last entry in the history. */
static void
start_using_history ()
{
using_history ();
if (saved_line_for_history)
_rl_free_history_entry (saved_line_for_history);
saved_line_for_history = (HIST_ENTRY *)NULL;
}
/* Free the contents (and containing structure) of a HIST_ENTRY. */
void
_rl_free_history_entry (entry)
HIST_ENTRY *entry;
{
if (entry == 0)
return;
if (entry->line)
free (entry->line);
free (entry);
}
/* Perhaps put back the current line if it has changed. */
int
maybe_replace_line ()
{
HIST_ENTRY *temp;
temp = current_history ();
/* If the current line has changed, save the changes. */
if (temp && ((UNDO_LIST *)(temp->data) != rl_undo_list))
{
temp = replace_history_entry (where_history (), the_line, rl_undo_list);
free (temp->line);
free (temp);
}
return 0;
}
/* Put back the saved_line_for_history if there is one. */
int
maybe_unsave_line ()
{
int line_len;
if (saved_line_for_history)
{
line_len = strlen (saved_line_for_history->line);
if (line_len >= rl_line_buffer_len)
rl_extend_line_buffer (line_len);
strcpy (the_line, saved_line_for_history->line);
rl_undo_list = (UNDO_LIST *)saved_line_for_history->data;
_rl_free_history_entry (saved_line_for_history);
saved_line_for_history = (HIST_ENTRY *)NULL;
rl_end = rl_point = strlen (the_line);
}
else
ding ();
return 0;
}
/* Save the current line in saved_line_for_history. */
int
maybe_save_line ()
{
if (saved_line_for_history == 0)
{
saved_line_for_history = (HIST_ENTRY *)xmalloc (sizeof (HIST_ENTRY));
saved_line_for_history->line = savestring (the_line);
saved_line_for_history->data = (char *)rl_undo_list;
}
return 0;
}
/* **************************************************************** */
/* */
/* History Commands */
/* */
/* **************************************************************** */
/* Meta-< goes to the start of the history. */
int
rl_beginning_of_history (count, key)
int count, key;
{
return (rl_get_previous_history (1 + where_history (), key));
}
/* Meta-> goes to the end of the history. (The current line). */
int
rl_end_of_history (count, key)
int count, key;
{
maybe_replace_line ();
using_history ();
maybe_unsave_line ();
return 0;
}
/* Move down to the next history line. */
int
rl_get_next_history (count, key)
int count, key;
{
HIST_ENTRY *temp;
int line_len;
if (count < 0)
return (rl_get_previous_history (-count, key));
if (count == 0)
return 0;
maybe_replace_line ();
temp = (HIST_ENTRY *)NULL;
while (count)
{
temp = next_history ();
if (!temp)
break;
--count;
}
if (temp == 0)
maybe_unsave_line ();
else
{
line_len = strlen (temp->line);
if (line_len >= rl_line_buffer_len)
rl_extend_line_buffer (line_len);
strcpy (the_line, temp->line);
rl_undo_list = (UNDO_LIST *)temp->data;
rl_end = rl_point = strlen (the_line);
#if defined (VI_MODE)
if (rl_editing_mode == vi_mode)
rl_point = 0;
#endif /* VI_MODE */
}
return 0;
}
/* Get the previous item out of our interactive history, making it the current
line. If there is no previous history, just ding. */
int
rl_get_previous_history (count, key)
int count, key;
{
HIST_ENTRY *old_temp, *temp;
int line_len;
if (count < 0)
return (rl_get_next_history (-count, key));
if (count == 0)
return 0;
/* If we don't have a line saved, then save this one. */
maybe_save_line ();
/* If the current line has changed, save the changes. */
maybe_replace_line ();
temp = old_temp = (HIST_ENTRY *)NULL;
while (count)
{
temp = previous_history ();
if (temp == 0)
break;
old_temp = temp;
--count;
}
/* If there was a large argument, and we moved back to the start of the
history, that is not an error. So use the last value found. */
if (!temp && old_temp)
temp = old_temp;
if (temp == 0)
ding ();
else
{
line_len = strlen (temp->line);
if (line_len >= rl_line_buffer_len)
rl_extend_line_buffer (line_len);
strcpy (the_line, temp->line);
rl_undo_list = (UNDO_LIST *)temp->data;
rl_end = rl_point = line_len;
#if defined (VI_MODE)
if (rl_editing_mode == vi_mode)
rl_point = 0;
#endif /* VI_MODE */
}
return 0;
}
/* **************************************************************** */
/* */
/* The Mark and the Region. */
/* */
/* **************************************************************** */
/* Set the mark at POSITION. */
int
_rl_set_mark_at_pos (position)
int position;
{
if (position > rl_end)
return -1;
rl_mark = position;
return 0;
}
/* A bindable command to set the mark. */
int
rl_set_mark (count, key)
int count, key;
{
return (_rl_set_mark_at_pos (rl_explicit_arg ? count : rl_point));
}
/* Exchange the position of mark and point. */
int
rl_exchange_point_and_mark (count, key)
int count, key;
{
if (rl_mark > rl_end)
rl_mark = -1;
if (rl_mark == -1)
{
ding ();
return -1;
}
else
SWAP (rl_point, rl_mark);
return 0;
}
/* **************************************************************** */
/* */
/* Editing Modes */
/* */
/* **************************************************************** */
/* How to toggle back and forth between editing modes. */
int
rl_vi_editing_mode (count, key)
int count, key;
{
#if defined (VI_MODE)
rl_editing_mode = vi_mode;
rl_vi_insertion_mode (1, key);
#endif /* VI_MODE */
return 0;
}
int
rl_emacs_editing_mode (count, key)
int count, key;
{
rl_editing_mode = emacs_mode;
_rl_keymap = emacs_standard_keymap;
return 0;
}
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