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/* kill.c -- kill ring management. */
/* Copyright (C) 1994-2021 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
#include <sys/types.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h> /* for _POSIX_VERSION */
#endif /* HAVE_UNISTD_H */
#if defined (HAVE_STDLIB_H)
# include <stdlib.h>
#else
# include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */
#include <stdio.h>
/* System-specific feature definitions and include files. */
#include "rldefs.h"
/* Some standard library routines. */
#include "readline.h"
#include "history.h"
#include "rlprivate.h"
#include "xmalloc.h"
/* **************************************************************** */
/* */
/* Killing Mechanism */
/* */
/* **************************************************************** */
/* What we assume for a max number of kills. */
#define DEFAULT_MAX_KILLS 10
/* The real variable to look at to find out when to flush kills. */
static int rl_max_kills = DEFAULT_MAX_KILLS;
/* Where to store killed text. */
static char **rl_kill_ring = (char **)NULL;
/* Where we are in the kill ring. */
static int rl_kill_index;
/* How many slots we have in the kill ring. */
static int rl_kill_ring_length;
static int _rl_copy_to_kill_ring (char *, int);
static int region_kill_internal (int);
static int _rl_copy_word_as_kill (int, int);
static int rl_yank_nth_arg_internal (int, int, int);
/* How to say that you only want to save a certain amount
of kill material. */
int
rl_set_retained_kills (int num)
{
return 0;
}
/* Add TEXT to the kill ring, allocating a new kill ring slot as necessary.
This uses TEXT directly, so the caller must not free it. If APPEND is
non-zero, and the last command was a kill, the text is appended to the
current kill ring slot, otherwise prepended. */
static int
_rl_copy_to_kill_ring (char *text, int append)
{
char *old, *new;
int slot;
/* First, find the slot to work with. */
if (_rl_last_command_was_kill == 0 || rl_kill_ring == 0)
{
/* Get a new slot. */
if (rl_kill_ring == 0)
{
/* If we don't have any defined, then make one. */
rl_kill_ring = (char **)
xmalloc (((rl_kill_ring_length = 1) + 1) * sizeof (char *));
rl_kill_ring[slot = 0] = (char *)NULL;
}
else
{
/* We have to add a new slot on the end, unless we have
exceeded the max limit for remembering kills. */
slot = rl_kill_ring_length;
if (slot == rl_max_kills)
{
register int i;
xfree (rl_kill_ring[0]);
for (i = 0; i < slot; i++)
rl_kill_ring[i] = rl_kill_ring[i + 1];
}
else
{
slot = rl_kill_ring_length += 1;
rl_kill_ring = (char **)xrealloc (rl_kill_ring, (slot + 1) * sizeof (char *));
}
rl_kill_ring[--slot] = (char *)NULL;
}
}
else
slot = rl_kill_ring_length - 1;
/* If the last command was a kill, prepend or append. */
if (_rl_last_command_was_kill && rl_kill_ring[slot] && rl_editing_mode != vi_mode)
{
old = rl_kill_ring[slot];
new = (char *)xmalloc (1 + strlen (old) + strlen (text));
if (append)
{
strcpy (new, old);
strcat (new, text);
}
else
{
strcpy (new, text);
strcat (new, old);
}
xfree (old);
xfree (text);
rl_kill_ring[slot] = new;
}
else
rl_kill_ring[slot] = text;
rl_kill_index = slot;
return 0;
}
/* The way to kill something. This appends or prepends to the last
kill, if the last command was a kill command. if FROM is less
than TO, then the text is appended, otherwise prepended. If the
last command was not a kill command, then a new slot is made for
this kill. */
int
rl_kill_text (int from, int to)
{
char *text;
/* Is there anything to kill? */
if (from == to)
{
_rl_last_command_was_kill++;
return 0;
}
text = rl_copy_text (from, to);
/* Delete the copied text from the line. */
rl_delete_text (from, to);
_rl_copy_to_kill_ring (text, from < to);
_rl_last_command_was_kill++;
return 0;
}
/* Now REMEMBER! In order to do prepending or appending correctly, kill
commands always make rl_point's original position be the FROM argument,
and rl_point's extent be the TO argument. */
/* **************************************************************** */
/* */
/* Killing Commands */
/* */
/* **************************************************************** */
/* Delete the word at point, saving the text in the kill ring. */
int
rl_kill_word (int count, int key)
{
int orig_point;
if (count < 0)
return (rl_backward_kill_word (-count, key));
else
{
orig_point = rl_point;
rl_forward_word (count, key);
if (rl_point != orig_point)
rl_kill_text (orig_point, rl_point);
rl_point = orig_point;
if (rl_editing_mode == emacs_mode)
rl_mark = rl_point;
}
return 0;
}
/* Rubout the word before point, placing it on the kill ring. */
int
rl_backward_kill_word (int count, int key)
{
int orig_point;
if (count < 0)
return (rl_kill_word (-count, key));
else
{
orig_point = rl_point;
rl_backward_word (count, key);
if (rl_point != orig_point)
rl_kill_text (orig_point, rl_point);
if (rl_editing_mode == emacs_mode)
rl_mark = rl_point;
}
return 0;
}
/* Kill from here to the end of the line. If DIRECTION is negative, kill
back to the line start instead. */
int
rl_kill_line (int direction, int key)
{
int orig_point;
if (direction < 0)
return (rl_backward_kill_line (1, key));
else
{
orig_point = rl_point;
rl_end_of_line (1, key);
if (orig_point != rl_point)
rl_kill_text (orig_point, rl_point);
rl_point = orig_point;
if (rl_editing_mode == emacs_mode)
rl_mark = rl_point;
}
return 0;
}
/* Kill backwards to the start of the line. If DIRECTION is negative, kill
forwards to the line end instead. */
int
rl_backward_kill_line (int direction, int key)
{
int orig_point;
if (direction < 0)
return (rl_kill_line (1, key));
else
{
if (rl_point == 0)
rl_ding ();
else
{
orig_point = rl_point;
rl_beg_of_line (1, key);
if (rl_point != orig_point)
rl_kill_text (orig_point, rl_point);
if (rl_editing_mode == emacs_mode)
rl_mark = rl_point;
}
}
return 0;
}
/* Kill the whole line, no matter where point is. */
int
rl_kill_full_line (int count, int key)
{
rl_begin_undo_group ();
rl_point = 0;
rl_kill_text (rl_point, rl_end);
rl_mark = 0;
rl_end_undo_group ();
return 0;
}
/* The next two functions mimic unix line editing behaviour, except they
save the deleted text on the kill ring. This is safer than not saving
it, and since we have a ring, nobody should get screwed. */
/* This does what C-w does in Unix. We can't prevent people from
using behaviour that they expect. */
int
rl_unix_word_rubout (int count, int key)
{
int orig_point;
if (rl_point == 0)
rl_ding ();
else
{
orig_point = rl_point;
if (count <= 0)
count = 1;
while (count--)
{
while (rl_point && whitespace (rl_line_buffer[rl_point - 1]))
rl_point--;
while (rl_point && (whitespace (rl_line_buffer[rl_point - 1]) == 0))
rl_point--; /* XXX - multibyte? */
}
rl_kill_text (orig_point, rl_point);
if (rl_editing_mode == emacs_mode)
rl_mark = rl_point;
}
return 0;
}
/* This deletes one filename component in a Unix pathname. That is, it
deletes backward to directory separator (`/') or whitespace. */
int
rl_unix_filename_rubout (int count, int key)
{
int orig_point, c;
if (rl_point == 0)
rl_ding ();
else
{
orig_point = rl_point;
if (count <= 0)
count = 1;
while (count--)
{
c = rl_line_buffer[rl_point - 1];
/* First move backwards through whitespace */
while (rl_point && whitespace (c))
{
rl_point--;
c = rl_line_buffer[rl_point - 1];
}
/* Consume one or more slashes. */
if (c == '/')
{
int i;
i = rl_point - 1;
while (i > 0 && c == '/')
c = rl_line_buffer[--i];
if (i == 0 || whitespace (c))
{
rl_point = i + whitespace (c);
continue; /* slashes only */
}
c = '/';
}
while (rl_point && (whitespace (c) || c == '/'))
{
rl_point--;
c = rl_line_buffer[rl_point - 1];
}
while (rl_point && (whitespace (c) == 0) && c != '/')
{
rl_point--; /* XXX - multibyte? */
c = rl_line_buffer[rl_point - 1];
}
}
rl_kill_text (orig_point, rl_point);
if (rl_editing_mode == emacs_mode)
rl_mark = rl_point;
}
return 0;
}
/* Here is C-u doing what Unix does. You don't *have* to use these
key-bindings. We have a choice of killing the entire line, or
killing from where we are to the start of the line. We choose the
latter, because if you are a Unix weenie, then you haven't backspaced
into the line at all, and if you aren't, then you know what you are
doing. */
int
rl_unix_line_discard (int count, int key)
{
if (rl_point == 0)
rl_ding ();
else
{
rl_kill_text (rl_point, 0);
rl_point = 0;
if (rl_editing_mode == emacs_mode)
rl_mark = rl_point;
}
return 0;
}
/* Copy the text in the `region' to the kill ring. If DELETE is non-zero,
delete the text from the line as well. */
static int
region_kill_internal (int delete)
{
char *text;
if (rl_mark != rl_point)
{
text = rl_copy_text (rl_point, rl_mark);
if (delete)
rl_delete_text (rl_point, rl_mark);
_rl_copy_to_kill_ring (text, rl_point < rl_mark);
}
_rl_fix_point (1);
_rl_last_command_was_kill++;
return 0;
}
/* Copy the text in the region to the kill ring. */
int
rl_copy_region_to_kill (int count, int key)
{
return (region_kill_internal (0));
}
/* Kill the text between the point and mark. */
int
rl_kill_region (int count, int key)
{
int r, npoint;
npoint = (rl_point < rl_mark) ? rl_point : rl_mark;
r = region_kill_internal (1);
rl_point = npoint;
_rl_fix_point (1);
return r;
}
/* Copy COUNT words to the kill ring. DIR says which direction we look
to find the words. */
static int
_rl_copy_word_as_kill (int count, int dir)
{
int om, op, r;
om = rl_mark;
op = rl_point;
if (dir > 0)
rl_forward_word (count, 0);
else
rl_backward_word (count, 0);
rl_mark = rl_point;
if (dir > 0)
rl_backward_word (count, 0);
else
rl_forward_word (count, 0);
r = region_kill_internal (0);
rl_mark = om;
rl_point = op;
return r;
}
int
rl_copy_forward_word (int count, int key)
{
if (count < 0)
return (rl_copy_backward_word (-count, key));
return (_rl_copy_word_as_kill (count, 1));
}
int
rl_copy_backward_word (int count, int key)
{
if (count < 0)
return (rl_copy_forward_word (-count, key));
return (_rl_copy_word_as_kill (count, -1));
}
/* Yank back the last killed text. This ignores arguments. */
int
rl_yank (int count, int key)
{
if (rl_kill_ring == 0)
{
_rl_abort_internal ();
return 1;
}
_rl_set_mark_at_pos (rl_point);
rl_insert_text (rl_kill_ring[rl_kill_index]);
return 0;
}
/* If the last command was yank, or yank_pop, and the text just
before point is identical to the current kill item, then
delete that text from the line, rotate the index down, and
yank back some other text. */
int
rl_yank_pop (int count, int key)
{
int l, n;
if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) ||
!rl_kill_ring)
{
_rl_abort_internal ();
return 1;
}
l = strlen (rl_kill_ring[rl_kill_index]);
n = rl_point - l;
if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l))
{
rl_delete_text (n, rl_point);
rl_point = n;
rl_kill_index--;
if (rl_kill_index < 0)
rl_kill_index = rl_kill_ring_length - 1;
rl_yank (1, 0);
return 0;
}
else
{
_rl_abort_internal ();
return 1;
}
}
#if defined (VI_MODE)
int
rl_vi_yank_pop (int count, int key)
{
int l, n, origpoint;
if (((rl_last_func != rl_vi_yank_pop) && (rl_last_func != rl_vi_put)) ||
!rl_kill_ring)
{
_rl_abort_internal ();
return 1;
}
l = strlen (rl_kill_ring[rl_kill_index]);
#if 0 /* TAG:readline-8.3 8/29/2022 matteopaolini1995@gmail.com */
origpoint = rl_point;
n = rl_point - l + 1;
#else
n = rl_point - l;
#endif
if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l))
{
#if 0 /* TAG:readline-8.3 */
rl_delete_text (n, n + l); /* remember vi cursor positioning */
rl_point = origpoint - l;
#else
rl_delete_text (n, rl_point);
rl_point = n;
#endif
rl_kill_index--;
if (rl_kill_index < 0)
rl_kill_index = rl_kill_ring_length - 1;
rl_vi_put (1, 'p');
return 0;
}
else
{
_rl_abort_internal ();
return 1;
}
}
#endif /* VI_MODE */
/* Yank the COUNTh argument from the previous history line, skipping
HISTORY_SKIP lines before looking for the `previous line'. */
static int
rl_yank_nth_arg_internal (int count, int key, int history_skip)
{
register HIST_ENTRY *entry;
char *arg;
int i, pos;
pos = where_history ();
if (history_skip)
{
for (i = 0; i < history_skip; i++)
entry = previous_history ();
}
entry = previous_history ();
history_set_pos (pos);
if (entry == 0)
{
rl_ding ();
return 1;
}
arg = history_arg_extract (count, count, entry->line);
if (!arg || !*arg)
{
rl_ding ();
FREE (arg);
return 1;
}
rl_begin_undo_group ();
_rl_set_mark_at_pos (rl_point);
#if defined (VI_MODE)
/* Vi mode always inserts a space before yanking the argument, and it
inserts it right *after* rl_point. */
if (rl_editing_mode == vi_mode && _rl_keymap == vi_movement_keymap)
{
rl_vi_append_mode (1, key);
rl_insert_text (" ");
}
#endif /* VI_MODE */
rl_insert_text (arg);
xfree (arg);
rl_end_undo_group ();
return 0;
}
/* Yank the COUNTth argument from the previous history line. */
int
rl_yank_nth_arg (int count, int key)
{
return (rl_yank_nth_arg_internal (count, key, 0));
}
/* Yank the last argument from the previous history line. This `knows'
how rl_yank_nth_arg treats a count of `$'. With an argument, this
behaves the same as rl_yank_nth_arg. */
int
rl_yank_last_arg (int count, int key)
{
static int history_skip = 0;
static int explicit_arg_p = 0;
static int count_passed = 1;
static int direction = 1;
static int undo_needed = 0;
int retval;
if (rl_last_func != rl_yank_last_arg)
{
history_skip = 0;
explicit_arg_p = rl_explicit_arg;
count_passed = count;
direction = 1;
}
else
{
if (undo_needed)
rl_do_undo ();
if (count < 0) /* XXX - was < 1 */
direction = -direction;
history_skip += direction;
if (history_skip < 0)
history_skip = 0;
}
if (explicit_arg_p)
retval = rl_yank_nth_arg_internal (count_passed, key, history_skip);
else
retval = rl_yank_nth_arg_internal ('$', key, history_skip);
undo_needed = retval == 0;
return retval;
}
/* Having read the special escape sequence denoting the beginning of a
`bracketed paste' sequence, read the rest of the pasted input until the
closing sequence and return the pasted text. */
char *
_rl_bracketed_text (size_t *lenp)
{
int c;
size_t len, cap;
char *buf;
len = 0;
buf = xmalloc (cap = 64);
buf[0] = '\0';
RL_SETSTATE (RL_STATE_MOREINPUT);
while ((c = rl_read_key ()) >= 0)
{
if (RL_ISSTATE (RL_STATE_MACRODEF))
_rl_add_macro_char (c);
if (c == '\r') /* XXX */
c = '\n';
if (len == cap)
buf = xrealloc (buf, cap *= 2);
buf[len++] = c;
if (len >= BRACK_PASTE_SLEN && c == BRACK_PASTE_LAST &&
STREQN (buf + len - BRACK_PASTE_SLEN, BRACK_PASTE_SUFF, BRACK_PASTE_SLEN))
{
len -= BRACK_PASTE_SLEN;
break;
}
}
RL_UNSETSTATE (RL_STATE_MOREINPUT);
if (c >= 0)
{
if (len == cap)
buf = xrealloc (buf, cap + 1);
buf[len] = '\0';
}
if (lenp)
*lenp = len;
return (buf);
}
/* Having read the special escape sequence denoting the beginning of a
`bracketed paste' sequence, read the rest of the pasted input until the
closing sequence and insert the pasted text as a single unit without
interpretation. Temporarily highlight the inserted text. */
int
rl_bracketed_paste_begin (int count, int key)
{
int retval, c;
size_t len, cap;
char *buf;
buf = _rl_bracketed_text (&len);
rl_mark = rl_point;
retval = rl_insert_text (buf) == len ? 0 : 1;
if (_rl_enable_active_region)
rl_activate_mark ();
xfree (buf);
return (retval);
}
int
_rl_read_bracketed_paste_prefix (int c)
{
char pbuf[BRACK_PASTE_SLEN+1], *pbpref;
int key, ind, j;
pbpref = BRACK_PASTE_PREF; /* XXX - debugging */
if (c != pbpref[0])
return (0);
pbuf[ind = 0] = c;
while (ind < BRACK_PASTE_SLEN-1 &&
(RL_ISSTATE (RL_STATE_INPUTPENDING|RL_STATE_MACROINPUT) == 0) &&
_rl_pushed_input_available () == 0 &&
_rl_input_queued (0))
{
key = rl_read_key (); /* XXX - for now */
if (key < 0)
break;
pbuf[++ind] = key;
if (pbuf[ind] != pbpref[ind])
break;
}
if (ind < BRACK_PASTE_SLEN-1) /* read incomplete sequence */
{
while (ind >= 0)
_rl_unget_char (pbuf[ind--]);
return (key < 0 ? key : 0);
}
return (key < 0 ? key : 1);
}
/* Get a character from wherever we read input, handling input in bracketed
paste mode. If we don't have or use bracketed paste mode, this can be
used in place of rl_read_key(). */
int
_rl_bracketed_read_key ()
{
int c, r;
char *pbuf;
size_t pblen;
RL_SETSTATE(RL_STATE_MOREINPUT);
c = rl_read_key ();
RL_UNSETSTATE(RL_STATE_MOREINPUT);
if (c < 0)
return -1;
/* read pasted data with bracketed-paste mode enabled. */
if (_rl_enable_bracketed_paste && c == ESC && (r = _rl_read_bracketed_paste_prefix (c)) == 1)
{
pbuf = _rl_bracketed_text (&pblen);
if (pblen == 0)
{
xfree (pbuf);
return 0; /* XXX */
}
c = (unsigned char)pbuf[0];
if (pblen > 1)
{
while (--pblen > 0)
_rl_unget_char ((unsigned char)pbuf[pblen]);
}
xfree (pbuf);
}
return c;
}
/* Get a character from wherever we read input, handling input in bracketed
paste mode. If we don't have or use bracketed paste mode, this can be
used in place of rl_read_key(). */
int
_rl_bracketed_read_mbstring (char *mb, int mlen)
{
int c, r;
c = _rl_bracketed_read_key ();
if (c < 0)
return -1;
#if defined (HANDLE_MULTIBYTE)
if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
c = _rl_read_mbstring (c, mb, mlen);
else
#endif
mb[0] = c;
mb[mlen] = '\0'; /* just in case */
return c;
}
/* A special paste command for Windows users. */
#if defined (_WIN32)
#include <windows.h>
int
rl_paste_from_clipboard (int count, int key)
{
char *data, *ptr;
int len;
if (OpenClipboard (NULL) == 0)
return (0);
data = (char *)GetClipboardData (CF_TEXT);
if (data)
{
ptr = strchr (data, '\r');
if (ptr)
{
len = ptr - data;
ptr = (char *)xmalloc (len + 1);
ptr[len] = '\0';
strncpy (ptr, data, len);
}
else
ptr = data;
_rl_set_mark_at_pos (rl_point);
rl_insert_text (ptr);
if (ptr != data)
xfree (ptr);
CloseClipboard ();
}
return (0);
}
#endif /* _WIN32 */
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