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text.c
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1702 lines (1428 loc) · 37.1 KB
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/* text.c -- text handling commands for readline. */
/* Copyright (C) 1987-2010 Free Software Foundation, Inc.
This file is part of the GNU Readline Library (Readline), a library
for reading lines of text with interactive input and history editing.
Readline 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.
Readline 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 Readline. If not, see <http://www.gnu.org/licenses/>.
*/
#define READLINE_LIBRARY
#if defined (HAVE_CONFIG_H)
# include <config.h>
#endif
#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 <stdio.h>
/* System-specific feature definitions and include files. */
#include "rldefs.h"
#include "rlmbutil.h"
#if defined (__EMX__)
# define INCL_DOSPROCESS
# include <os2.h>
#endif /* __EMX__ */
/* Some standard library routines. */
#include "readline.h"
#include "history.h"
#include "rlprivate.h"
#include "rlshell.h"
#include "xmalloc.h"
/* Forward declarations. */
static int rl_change_case PARAMS((int, int));
static int _rl_char_search PARAMS((int, int, int));
#if defined (READLINE_CALLBACKS)
static int _rl_insert_next_callback PARAMS((_rl_callback_generic_arg *));
static int _rl_char_search_callback PARAMS((_rl_callback_generic_arg *));
#endif
/* The largest chunk of text that can be inserted in one call to
rl_insert_text. Text blocks larger than this are divided. */
#define TEXT_COUNT_MAX 1024
/* **************************************************************** */
/* */
/* 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_char () calls this
function. Returns the number of characters inserted. */
int
rl_insert_text (string)
const char *string;
{
register int i, l;
l = (string && *string) ? strlen (string) : 0;
if (l == 0)
return 0;
if (rl_end + l >= rl_line_buffer_len)
rl_extend_line_buffer (rl_end + l);
for (i = rl_end; i >= rl_point; i--)
rl_line_buffer[i + l] = rl_line_buffer[i];
strncpy (rl_line_buffer + rl_point, string, l);
/* Remember how to undo this if we aren't undoing something. */
if (_rl_doing_an_undo == 0)
{
/* 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;
rl_line_buffer[rl_end] = '\0';
return l;
}
/* Delete the string between FROM and TO. FROM is inclusive, TO is not.
Returns the number of characters deleted. */
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;
}
if (from < 0)
from = 0;
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++)
rl_line_buffer[i] = rl_line_buffer[i + diff];
/* Remember how to undo this delete. */
if (_rl_doing_an_undo == 0)
rl_add_undo (UNDO_DELETE, from, to, text);
else
xfree (text);
rl_end -= diff;
rl_line_buffer[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
/* Replace the contents of the line buffer between START and END with
TEXT. The operation is undoable. To replace the entire line in an
undoable mode, use _rl_replace_text(text, 0, rl_end); */
int
_rl_replace_text (text, start, end)
const char *text;
int start, end;
{
int n;
n = 0;
rl_begin_undo_group ();
if (start <= end)
rl_delete_text (start, end + 1);
rl_point = start;
if (*text)
n = rl_insert_text (text);
rl_end_undo_group ();
return n;
}
/* Replace the current line buffer contents with TEXT. If CLEAR_UNDO is
non-zero, we free the current undo list. */
void
rl_replace_line (text, clear_undo)
const char *text;
int clear_undo;
{
int len;
len = strlen (text);
if (len >= rl_line_buffer_len)
rl_extend_line_buffer (len);
strcpy (rl_line_buffer, text);
rl_end = len;
if (clear_undo)
rl_free_undo_list ();
_rl_fix_point (1);
}
/* **************************************************************** */
/* */
/* 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 bytes. */
int
rl_forward_byte (count, key)
int count, key;
{
if (count < 0)
return (rl_backward_byte (-count, key));
if (count > 0)
{
int end, lend;
end = rl_point + count;
#if defined (VI_MODE)
lend = rl_end > 0 ? rl_end - (VI_COMMAND_MODE()) : rl_end;
#else
lend = rl_end;
#endif
if (end > lend)
{
rl_point = lend;
rl_ding ();
}
else
rl_point = end;
}
if (rl_end < 0)
rl_end = 0;
return 0;
}
int
_rl_forward_char_internal (count)
int count;
{
int point;
#if defined (HANDLE_MULTIBYTE)
point = _rl_find_next_mbchar (rl_line_buffer, rl_point, count, MB_FIND_NONZERO);
#if defined (VI_MODE)
if (point >= rl_end && VI_COMMAND_MODE())
point = _rl_find_prev_mbchar (rl_line_buffer, rl_end, MB_FIND_NONZERO);
#endif
if (rl_end < 0)
rl_end = 0;
#else
point = rl_point + count;
if (point > rl_end)
point = rl_end;
#endif
return (point);
}
#if defined (HANDLE_MULTIBYTE)
/* Move forward COUNT characters. */
int
rl_forward_char (count, key)
int count, key;
{
int point;
if (MB_CUR_MAX == 1 || rl_byte_oriented)
return (rl_forward_byte (count, key));
if (count < 0)
return (rl_backward_char (-count, key));
if (count > 0)
{
if (rl_point == rl_end && EMACS_MODE())
{
rl_ding ();
return 0;
}
point = _rl_forward_char_internal (count);
if (rl_point == point)
rl_ding ();
rl_point = point;
}
return 0;
}
#else /* !HANDLE_MULTIBYTE */
int
rl_forward_char (count, key)
int count, key;
{
return (rl_forward_byte (count, key));
}
#endif /* !HANDLE_MULTIBYTE */
/* Backwards compatibility. */
int
rl_forward (count, key)
int count, key;
{
return (rl_forward_char (count, key));
}
/* Move backward COUNT bytes. */
int
rl_backward_byte (count, key)
int count, key;
{
if (count < 0)
return (rl_forward_byte (-count, key));
if (count > 0)
{
if (rl_point < count)
{
rl_point = 0;
rl_ding ();
}
else
rl_point -= count;
}
if (rl_point < 0)
rl_point = 0;
return 0;
}
#if defined (HANDLE_MULTIBYTE)
/* Move backward COUNT characters. */
int
rl_backward_char (count, key)
int count, key;
{
int point;
if (MB_CUR_MAX == 1 || rl_byte_oriented)
return (rl_backward_byte (count, key));
if (count < 0)
return (rl_forward_char (-count, key));
if (count > 0)
{
point = rl_point;
while (count > 0 && point > 0)
{
point = _rl_find_prev_mbchar (rl_line_buffer, point, MB_FIND_NONZERO);
count--;
}
if (count > 0)
{
rl_point = 0;
rl_ding ();
}
else
rl_point = point;
}
return 0;
}
#else
int
rl_backward_char (count, key)
int count, key;
{
return (rl_backward_byte (count, key));
}
#endif
/* Backwards compatibility. */
int
rl_backward (count, key)
int count, key;
{
return (rl_backward_char (count, key));
}
/* 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. Handles multibyte chars. */
int
rl_forward_word (count, key)
int count, key;
{
int c;
if (count < 0)
return (rl_backward_word (-count, key));
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 = _rl_char_value (rl_line_buffer, rl_point);
if (_rl_walphabetic (c) == 0)
{
rl_point = MB_NEXTCHAR (rl_line_buffer, rl_point, 1, MB_FIND_NONZERO);
while (rl_point < rl_end)
{
c = _rl_char_value (rl_line_buffer, rl_point);
if (_rl_walphabetic (c))
break;
rl_point = MB_NEXTCHAR (rl_line_buffer, rl_point, 1, MB_FIND_NONZERO);
}
}
if (rl_point == rl_end)
return 0;
rl_point = MB_NEXTCHAR (rl_line_buffer, rl_point, 1, MB_FIND_NONZERO);
while (rl_point < rl_end)
{
c = _rl_char_value (rl_line_buffer, rl_point);
if (_rl_walphabetic (c) == 0)
break;
rl_point = MB_NEXTCHAR (rl_line_buffer, rl_point, 1, MB_FIND_NONZERO);
}
--count;
}
return 0;
}
/* Move backward a word. We do what Emacs does. Handles multibyte chars. */
int
rl_backward_word (count, key)
int count, key;
{
int c, p;
if (count < 0)
return (rl_forward_word (-count, key));
while (count)
{
if (rl_point == 0)
return 0;
/* Like rl_forward_word (), except that we look at the characters
just before point. */
p = MB_PREVCHAR (rl_line_buffer, rl_point, MB_FIND_NONZERO);
c = _rl_char_value (rl_line_buffer, p);
if (_rl_walphabetic (c) == 0)
{
rl_point = p;
while (rl_point > 0)
{
p = MB_PREVCHAR (rl_line_buffer, rl_point, MB_FIND_NONZERO);
c = _rl_char_value (rl_line_buffer, p);
if (_rl_walphabetic (c))
break;
rl_point = p;
}
}
while (rl_point)
{
p = MB_PREVCHAR (rl_line_buffer, rl_point, MB_FIND_NONZERO);
c = _rl_char_value (rl_line_buffer, p);
if (_rl_walphabetic (c) == 0)
break;
else
rl_point = p;
}
--count;
}
return 0;
}
/* Clear the current line. Numeric argument to C-l does this. */
int
rl_refresh_line (ignore1, ignore2)
int ignore1, ignore2;
{
int curr_line;
curr_line = _rl_current_display_line ();
_rl_move_vert (curr_line);
_rl_move_cursor_relative (0, rl_line_buffer); /* XXX is this right */
_rl_clear_to_eol (0); /* arg of 0 means to not use spaces */
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 (count, key);
return 0;
}
_rl_clear_screen (); /* calls termcap function to clear screen */
rl_forced_update_display ();
rl_display_fixed = 1;
return 0;
}
int
rl_skip_csi_sequence (count, key)
int count, key;
{
int ch;
RL_SETSTATE (RL_STATE_MOREINPUT);
do
ch = rl_read_key ();
while (ch >= 0x20 && ch < 0x40);
RL_UNSETSTATE (RL_STATE_MOREINPUT);
return 0;
}
int
rl_arrow_keys (count, c)
int count, c;
{
int ch;
RL_SETSTATE(RL_STATE_MOREINPUT);
ch = rl_read_key ();
RL_UNSETSTATE(RL_STATE_MOREINPUT);
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':
if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
rl_forward_char (count, ch);
else
rl_forward_byte (count, ch);
break;
case 'D':
if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
rl_backward_char (count, ch);
else
rl_backward_byte (count, ch);
break;
default:
rl_ding ();
}
return 0;
}
/* **************************************************************** */
/* */
/* Text commands */
/* */
/* **************************************************************** */
#ifdef HANDLE_MULTIBYTE
static char pending_bytes[MB_LEN_MAX];
static int pending_bytes_length = 0;
static mbstate_t ps = {0};
#endif
/* Insert the character C at the current location, moving point forward.
If C introduces a multibyte sequence, we read the whole sequence and
then insert the multibyte char into the line buffer. */
int
_rl_insert_char (count, c)
int count, c;
{
register int i;
char *string;
#ifdef HANDLE_MULTIBYTE
int string_size;
char incoming[MB_LEN_MAX + 1];
int incoming_length = 0;
mbstate_t ps_back;
static int stored_count = 0;
#endif
if (count <= 0)
return 0;
#if defined (HANDLE_MULTIBYTE)
if (MB_CUR_MAX == 1 || rl_byte_oriented)
{
incoming[0] = c;
incoming[1] = '\0';
incoming_length = 1;
}
else
{
wchar_t wc;
size_t ret;
if (stored_count <= 0)
stored_count = count;
else
count = stored_count;
ps_back = ps;
pending_bytes[pending_bytes_length++] = c;
ret = mbrtowc (&wc, pending_bytes, pending_bytes_length, &ps);
if (ret == (size_t)-2)
{
/* Bytes too short to compose character, try to wait for next byte.
Restore the state of the byte sequence, because in this case the
effect of mbstate is undefined. */
ps = ps_back;
return 1;
}
else if (ret == (size_t)-1)
{
/* Invalid byte sequence for the current locale. Treat first byte
as a single character. */
incoming[0] = pending_bytes[0];
incoming[1] = '\0';
incoming_length = 1;
pending_bytes_length--;
memmove (pending_bytes, pending_bytes + 1, pending_bytes_length);
/* Clear the state of the byte sequence, because in this case the
effect of mbstate is undefined. */
memset (&ps, 0, sizeof (mbstate_t));
}
else if (ret == (size_t)0)
{
incoming[0] = '\0';
incoming_length = 0;
pending_bytes_length--;
/* Clear the state of the byte sequence, because in this case the
effect of mbstate is undefined. */
memset (&ps, 0, sizeof (mbstate_t));
}
else
{
/* We successfully read a single multibyte character. */
memcpy (incoming, pending_bytes, pending_bytes_length);
incoming[pending_bytes_length] = '\0';
incoming_length = pending_bytes_length;
pending_bytes_length = 0;
}
}
#endif /* HANDLE_MULTIBYTE */
/* If we can optimize, then do it. But don't let people crash
readline because of extra large arguments. */
if (count > 1 && count <= TEXT_COUNT_MAX)
{
#if defined (HANDLE_MULTIBYTE)
string_size = count * incoming_length;
string = (char *)xmalloc (1 + string_size);
i = 0;
while (i < string_size)
{
strncpy (string + i, incoming, incoming_length);
i += incoming_length;
}
incoming_length = 0;
stored_count = 0;
#else /* !HANDLE_MULTIBYTE */
string = (char *)xmalloc (1 + count);
for (i = 0; i < count; i++)
string[i] = c;
#endif /* !HANDLE_MULTIBYTE */
string[i] = '\0';
rl_insert_text (string);
xfree (string);
return 0;
}
if (count > TEXT_COUNT_MAX)
{
int decreaser;
#if defined (HANDLE_MULTIBYTE)
string_size = incoming_length * TEXT_COUNT_MAX;
string = (char *)xmalloc (1 + string_size);
i = 0;
while (i < string_size)
{
strncpy (string + i, incoming, incoming_length);
i += incoming_length;
}
while (count)
{
decreaser = (count > TEXT_COUNT_MAX) ? TEXT_COUNT_MAX : count;
string[decreaser*incoming_length] = '\0';
rl_insert_text (string);
count -= decreaser;
}
xfree (string);
incoming_length = 0;
stored_count = 0;
#else /* !HANDLE_MULTIBYTE */
char str[TEXT_COUNT_MAX+1];
for (i = 0; i < TEXT_COUNT_MAX; i++)
str[i] = c;
while (count)
{
decreaser = (count > TEXT_COUNT_MAX ? TEXT_COUNT_MAX : count);
str[decreaser] = '\0';
rl_insert_text (str);
count -= decreaser;
}
#endif /* !HANDLE_MULTIBYTE */
return 0;
}
if (MB_CUR_MAX == 1 || rl_byte_oriented)
{
/* 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. Don't do this if we're current reading input from
a macro. */
if ((RL_ISSTATE (RL_STATE_MACROINPUT) == 0) && _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);
}
}
#if defined (HANDLE_MULTIBYTE)
else
{
rl_insert_text (incoming);
stored_count = 0;
}
#endif
return 0;
}
/* Overwrite the character at point (or next COUNT characters) with C.
If C introduces a multibyte character sequence, read the entire sequence
before starting the overwrite loop. */
int
_rl_overwrite_char (count, c)
int count, c;
{
int i;
#if defined (HANDLE_MULTIBYTE)
char mbkey[MB_LEN_MAX];
int k;
/* Read an entire multibyte character sequence to insert COUNT times. */
if (count > 0 && MB_CUR_MAX > 1 && rl_byte_oriented == 0)
k = _rl_read_mbstring (c, mbkey, MB_LEN_MAX);
#endif
rl_begin_undo_group ();
for (i = 0; i < count; i++)
{
#if defined (HANDLE_MULTIBYTE)
if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
rl_insert_text (mbkey);
else
#endif
_rl_insert_char (1, c);
if (rl_point < rl_end)
rl_delete (1, c);
}
rl_end_undo_group ();
return 0;
}
int
rl_insert (count, c)
int count, c;
{
return (rl_insert_mode == RL_IM_INSERT ? _rl_insert_char (count, c)
: _rl_overwrite_char (count, c));
}
/* Insert the next typed character verbatim. */
static int
_rl_insert_next (count)
int count;
{
int c;
RL_SETSTATE(RL_STATE_MOREINPUT);
c = rl_read_key ();
RL_UNSETSTATE(RL_STATE_MOREINPUT);
if (c < 0)
return -1;
#if defined (HANDLE_SIGNALS)
if (RL_ISSTATE (RL_STATE_CALLBACK) == 0)
_rl_restore_tty_signals ();
#endif
return (_rl_insert_char (count, c));
}
#if defined (READLINE_CALLBACKS)
static int
_rl_insert_next_callback (data)
_rl_callback_generic_arg *data;
{
int count;
count = data->count;
/* Deregister function, let rl_callback_read_char deallocate data */
_rl_callback_func = 0;
_rl_want_redisplay = 1;
return _rl_insert_next (count);
}
#endif
int
rl_quoted_insert (count, key)
int count, key;
{
/* Let's see...should the callback interface futz with signal handling? */
#if defined (HANDLE_SIGNALS)
if (RL_ISSTATE (RL_STATE_CALLBACK) == 0)
_rl_disable_tty_signals ();
#endif
#if defined (READLINE_CALLBACKS)
if (RL_ISSTATE (RL_STATE_CALLBACK))
{
_rl_callback_data = _rl_callback_data_alloc (count);
_rl_callback_func = _rl_insert_next_callback;
return (0);
}
#endif
return _rl_insert_next (count);
}
/* Insert a tab character. */
int
rl_tab_insert (count, key)
int count, key;
{
return (_rl_insert_char (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 (_rl_history_preserve_point)
_rl_history_saved_point = (rl_point == rl_end) ? -1 : rl_point;
RL_SETSTATE(RL_STATE_DONE);
#if defined (VI_MODE)
if (rl_editing_mode == vi_mode)
{
_rl_vi_done_inserting ();
if (_rl_vi_textmod_command (_rl_vi_last_command) == 0) /* XXX */
_rl_vi_reset_last ();
}
#endif /* VI_MODE */
/* If we've been asked to erase empty lines, suppress the final update,
since _rl_update_final calls rl_crlf(). */
if (rl_erase_empty_line && rl_point == 0 && rl_end == 0)
return 0;
if (_rl_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