IABSD.fr/src/lib/libedit/vi.c

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• Author : guenther
  Date : 2023-03-08 04:43:04
  Hash : 5b133f3f
  Message : Delete obsolete /* ARGSUSED */ lint comments. ok miod@ millert@

• lib/libedit/vi.c

• /*	$OpenBSD: vi.c,v 1.29 2023/03/08 04:43:05 guenther Exp $	*/
  /*	$NetBSD: vi.c,v 1.33 2011/02/17 16:44:48 joerg Exp $	*/
  
  /*-
   * Copyright (c) 1992, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Christos Zoulas of Cornell University.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include "config.h"
  
  /*
   * vi.c: Vi mode commands.
   */
  #include <sys/wait.h>
  #include <ctype.h>
  #include <limits.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include "el.h"
  #include "common.h"
  #include "emacs.h"
  #include "fcns.h"
  #include "vi.h"
  
  static el_action_t	cv_action(EditLine *, wint_t);
  static el_action_t	cv_paste(EditLine *, wint_t);
  
  /* cv_action():
   *	Handle vi actions.
   */
  static el_action_t
  cv_action(EditLine *el, wint_t c)
  {
  
  	if (el->el_chared.c_vcmd.action != NOP) {
  		/* 'cc', 'dd' and (possibly) friends */
  		if (c != (wint_t)el->el_chared.c_vcmd.action)
  			return CC_ERROR;
  
  		if (!(c & YANK))
  			cv_undo(el);
  		cv_yank(el, el->el_line.buffer,
  		    (int)(el->el_line.lastchar - el->el_line.buffer));
  		el->el_chared.c_vcmd.action = NOP;
  		el->el_chared.c_vcmd.pos = 0;
  		if (!(c & YANK)) {
  			el->el_line.lastchar = el->el_line.buffer;
  			el->el_line.cursor = el->el_line.buffer;
  		}
  		if (c & INSERT)
  			el->el_map.current = el->el_map.key;
  
  		return CC_REFRESH;
  	}
  	el->el_chared.c_vcmd.pos = el->el_line.cursor;
  	el->el_chared.c_vcmd.action = c;
  	return CC_ARGHACK;
  }
  
  /* cv_paste():
   *	Paste previous deletion before or after the cursor
   */
  static el_action_t
  cv_paste(EditLine *el, wint_t c)
  {
  	c_kill_t *k = &el->el_chared.c_kill;
  	size_t len = (size_t)(k->last - k->buf);
  
  	if (k->buf == NULL || len == 0)
  		return CC_ERROR;
  #ifdef DEBUG_PASTE
  	(void) fprintf(el->el_errfile, "Paste: \"%.*ls\"\n", (int)len,
  	    k->buf);
  #endif
  
  	cv_undo(el);
  
  	if (!c && el->el_line.cursor < el->el_line.lastchar)
  		el->el_line.cursor++;
  
  	c_insert(el, (int)len);
  	if (el->el_line.cursor + len > el->el_line.lastchar)
  		return CC_ERROR;
  	(void) memcpy(el->el_line.cursor, k->buf, len *
  	    sizeof(*el->el_line.cursor));
  
  	return CC_REFRESH;
  }
  
  
  /* vi_paste_next():
   *	Vi paste previous deletion to the right of the cursor
   *	[p]
   */
  protected el_action_t
  vi_paste_next(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	return cv_paste(el, 0);
  }
  
  
  /* vi_paste_prev():
   *	Vi paste previous deletion to the left of the cursor
   *	[P]
   */
  protected el_action_t
  vi_paste_prev(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	return cv_paste(el, 1);
  }
  
  
  /* vi_prev_big_word():
   *	Vi move to the previous space delimited word
   *	[B]
   */
  protected el_action_t
  vi_prev_big_word(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_line.cursor == el->el_line.buffer)
  		return CC_ERROR;
  
  	el->el_line.cursor = cv_prev_word(el->el_line.cursor,
  	    el->el_line.buffer,
  	    el->el_state.argument,
  	    cv__isWord);
  
  	if (el->el_chared.c_vcmd.action != NOP) {
  		cv_delfini(el);
  		return CC_REFRESH;
  	}
  	return CC_CURSOR;
  }
  
  
  /* vi_prev_word():
   *	Vi move to the previous word
   *	[b]
   */
  protected el_action_t
  vi_prev_word(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_line.cursor == el->el_line.buffer)
  		return CC_ERROR;
  
  	el->el_line.cursor = cv_prev_word(el->el_line.cursor,
  	    el->el_line.buffer,
  	    el->el_state.argument,
  	    cv__isword);
  
  	if (el->el_chared.c_vcmd.action != NOP) {
  		cv_delfini(el);
  		return CC_REFRESH;
  	}
  	return CC_CURSOR;
  }
  
  
  /* vi_next_big_word():
   *	Vi move to the next space delimited word
   *	[W]
   */
  protected el_action_t
  vi_next_big_word(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_line.cursor >= el->el_line.lastchar - 1)
  		return CC_ERROR;
  
  	el->el_line.cursor = cv_next_word(el, el->el_line.cursor,
  	    el->el_line.lastchar, el->el_state.argument, cv__isWord);
  
  	if (el->el_map.type == MAP_VI)
  		if (el->el_chared.c_vcmd.action != NOP) {
  			cv_delfini(el);
  			return CC_REFRESH;
  		}
  	return CC_CURSOR;
  }
  
  
  /* vi_next_word():
   *	Vi move to the next word
   *	[w]
   */
  protected el_action_t
  vi_next_word(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_line.cursor >= el->el_line.lastchar - 1)
  		return CC_ERROR;
  
  	el->el_line.cursor = cv_next_word(el, el->el_line.cursor,
  	    el->el_line.lastchar, el->el_state.argument, cv__isword);
  
  	if (el->el_map.type == MAP_VI)
  		if (el->el_chared.c_vcmd.action != NOP) {
  			cv_delfini(el);
  			return CC_REFRESH;
  		}
  	return CC_CURSOR;
  }
  
  
  /* vi_change_case():
   *	Vi change case of character under the cursor and advance one character
   *	[~]
   */
  protected el_action_t
  vi_change_case(EditLine *el, wint_t c)
  {
  	int i;
  
  	if (el->el_line.cursor >= el->el_line.lastchar)
  		return CC_ERROR;
  	cv_undo(el);
  	for (i = 0; i < el->el_state.argument; i++) {
  
  		c = *el->el_line.cursor;
  		if (iswupper(c))
  			*el->el_line.cursor = towlower(c);
  		else if (iswlower(c))
  			*el->el_line.cursor = towupper(c);
  
  		if (++el->el_line.cursor >= el->el_line.lastchar) {
  			el->el_line.cursor--;
  			re_fastaddc(el);
  			break;
  		}
  		re_fastaddc(el);
  	}
  	return CC_NORM;
  }
  
  
  /* vi_change_meta():
   *	Vi change prefix command
   *	[c]
   */
  protected el_action_t
  vi_change_meta(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	/*
           * Delete with insert == change: first we delete and then we leave in
           * insert mode.
           */
  	return cv_action(el, DELETE | INSERT);
  }
  
  
  /* vi_insert_at_bol():
   *	Vi enter insert mode at the beginning of line
   *	[I]
   */
  protected el_action_t
  vi_insert_at_bol(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	el->el_line.cursor = el->el_line.buffer;
  	cv_undo(el);
  	el->el_map.current = el->el_map.key;
  	return CC_CURSOR;
  }
  
  
  /* vi_replace_char():
   *	Vi replace character under the cursor with the next character typed
   *	[r]
   */
  protected el_action_t
  vi_replace_char(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_line.cursor >= el->el_line.lastchar)
  		return CC_ERROR;
  
  	el->el_map.current = el->el_map.key;
  	el->el_state.inputmode = MODE_REPLACE_1;
  	cv_undo(el);
  	return CC_ARGHACK;
  }
  
  
  /* vi_replace_mode():
   *	Vi enter replace mode
   *	[R]
   */
  protected el_action_t
  vi_replace_mode(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	el->el_map.current = el->el_map.key;
  	el->el_state.inputmode = MODE_REPLACE;
  	cv_undo(el);
  	return CC_NORM;
  }
  
  
  /* vi_substitute_char():
   *	Vi replace character under the cursor and enter insert mode
   *	[s]
   */
  protected el_action_t
  vi_substitute_char(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	c_delafter(el, el->el_state.argument);
  	el->el_map.current = el->el_map.key;
  	return CC_REFRESH;
  }
  
  
  /* vi_substitute_line():
   *	Vi substitute entire line
   *	[S]
   */
  protected el_action_t
  vi_substitute_line(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	cv_undo(el);
  	cv_yank(el, el->el_line.buffer,
  	    (int)(el->el_line.lastchar - el->el_line.buffer));
  	(void) em_kill_line(el, 0);
  	el->el_map.current = el->el_map.key;
  	return CC_REFRESH;
  }
  
  
  /* vi_change_to_eol():
   *	Vi change to end of line
   *	[C]
   */
  protected el_action_t
  vi_change_to_eol(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	cv_undo(el);
  	cv_yank(el, el->el_line.cursor,
  	    (int)(el->el_line.lastchar - el->el_line.cursor));
  	(void) ed_kill_line(el, 0);
  	el->el_map.current = el->el_map.key;
  	return CC_REFRESH;
  }
  
  
  /* vi_insert():
   *	Vi enter insert mode
   *	[i]
   */
  protected el_action_t
  vi_insert(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	el->el_map.current = el->el_map.key;
  	cv_undo(el);
  	return CC_NORM;
  }
  
  
  /* vi_add():
   *	Vi enter insert mode after the cursor
   *	[a]
   */
  protected el_action_t
  vi_add(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	int ret;
  
  	el->el_map.current = el->el_map.key;
  	if (el->el_line.cursor < el->el_line.lastchar) {
  		el->el_line.cursor++;
  		if (el->el_line.cursor > el->el_line.lastchar)
  			el->el_line.cursor = el->el_line.lastchar;
  		ret = CC_CURSOR;
  	} else
  		ret = CC_NORM;
  
  	cv_undo(el);
  
  	return ret;
  }
  
  
  /* vi_add_at_eol():
   *	Vi enter insert mode at end of line
   *	[A]
   */
  protected el_action_t
  vi_add_at_eol(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	el->el_map.current = el->el_map.key;
  	el->el_line.cursor = el->el_line.lastchar;
  	cv_undo(el);
  	return CC_CURSOR;
  }
  
  
  /* vi_delete_meta():
   *	Vi delete prefix command
   *	[d]
   */
  protected el_action_t
  vi_delete_meta(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	return cv_action(el, DELETE);
  }
  
  
  /* vi_end_big_word():
   *	Vi move to the end of the current space delimited word
   *	[E]
   */
  protected el_action_t
  vi_end_big_word(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_line.cursor == el->el_line.lastchar)
  		return CC_ERROR;
  
  	el->el_line.cursor = cv__endword(el->el_line.cursor,
  	    el->el_line.lastchar, el->el_state.argument, cv__isWord);
  
  	if (el->el_chared.c_vcmd.action != NOP) {
  		el->el_line.cursor++;
  		cv_delfini(el);
  		return CC_REFRESH;
  	}
  	return CC_CURSOR;
  }
  
  
  /* vi_end_word():
   *	Vi move to the end of the current word
   *	[e]
   */
  protected el_action_t
  vi_end_word(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_line.cursor == el->el_line.lastchar)
  		return CC_ERROR;
  
  	el->el_line.cursor = cv__endword(el->el_line.cursor,
  	    el->el_line.lastchar, el->el_state.argument, cv__isword);
  
  	if (el->el_chared.c_vcmd.action != NOP) {
  		el->el_line.cursor++;
  		cv_delfini(el);
  		return CC_REFRESH;
  	}
  	return CC_CURSOR;
  }
  
  
  /* vi_undo():
   *	Vi undo last change
   *	[u]
   */
  protected el_action_t
  vi_undo(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	c_undo_t un = el->el_chared.c_undo;
  
  	if (un.len == -1)
  		return CC_ERROR;
  
  	/* switch line buffer and undo buffer */
  	el->el_chared.c_undo.buf = el->el_line.buffer;
  	el->el_chared.c_undo.len = el->el_line.lastchar - el->el_line.buffer;
  	el->el_chared.c_undo.cursor =
  	    (int)(el->el_line.cursor - el->el_line.buffer);
  	el->el_line.limit = un.buf + (el->el_line.limit - el->el_line.buffer);
  	el->el_line.buffer = un.buf;
  	el->el_line.cursor = un.buf + un.cursor;
  	el->el_line.lastchar = un.buf + un.len;
  
  	return CC_REFRESH;
  }
  
  
  /* vi_command_mode():
   *	Vi enter command mode (use alternative key bindings)
   *	[<ESC>]
   */
  protected el_action_t
  vi_command_mode(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	/* [Esc] cancels pending action */
  	el->el_chared.c_vcmd.action = NOP;
  	el->el_chared.c_vcmd.pos = 0;
  
  	el->el_state.doingarg = 0;
  
  	el->el_state.inputmode = MODE_INSERT;
  	el->el_map.current = el->el_map.alt;
  #ifdef VI_MOVE
  	if (el->el_line.cursor > el->el_line.buffer)
  		el->el_line.cursor--;
  #endif
  	return CC_CURSOR;
  }
  
  
  /* vi_zero():
   *	Vi move to the beginning of line
   *	[0]
   */
  protected el_action_t
  vi_zero(EditLine *el, wint_t c)
  {
  
  	if (el->el_state.doingarg)
  		return ed_argument_digit(el, c);
  
  	el->el_line.cursor = el->el_line.buffer;
  	if (el->el_chared.c_vcmd.action != NOP) {
  		cv_delfini(el);
  		return CC_REFRESH;
  	}
  	return CC_CURSOR;
  }
  
  
  /* vi_delete_prev_char():
   *	Vi move to previous character (backspace)
   *	[^H] in insert mode only
   */
  protected el_action_t
  vi_delete_prev_char(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_line.cursor <= el->el_line.buffer)
  		return CC_ERROR;
  
  	c_delbefore1(el);
  	el->el_line.cursor--;
  	return CC_REFRESH;
  }
  
  
  /* vi_list_or_eof():
   *	Vi list choices for completion or indicate end of file if empty line
   *	[^D]
   */
  protected el_action_t
  vi_list_or_eof(EditLine *el, wint_t c)
  {
  
  	if (el->el_line.cursor == el->el_line.lastchar) {
  		if (el->el_line.cursor == el->el_line.buffer) {
  			terminal_writec(el, c);	/* then do a EOF */
  			return CC_EOF;
  		} else {
  			/*
  			 * Here we could list completions, but it is an
  			 * error right now
  			 */
  			terminal_beep(el);
  			return CC_ERROR;
  		}
  	} else {
  #ifdef notyet
  		re_goto_bottom(el);
  		*el->el_line.lastchar = '\0';	/* just in case */
  		return CC_LIST_CHOICES;
  #else
  		/*
  		 * Just complain for now.
  		 */
  		terminal_beep(el);
  		return CC_ERROR;
  #endif
  	}
  }
  
  
  /* vi_kill_line_prev():
   *	Vi cut from beginning of line to cursor
   *	[^U]
   */
  protected el_action_t
  vi_kill_line_prev(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	wchar_t *kp, *cp;
  
  	cp = el->el_line.buffer;
  	kp = el->el_chared.c_kill.buf;
  	while (cp < el->el_line.cursor)
  		*kp++ = *cp++;	/* copy it */
  	el->el_chared.c_kill.last = kp;
  	c_delbefore(el, (int)(el->el_line.cursor - el->el_line.buffer));
  	el->el_line.cursor = el->el_line.buffer;	/* zap! */
  	return CC_REFRESH;
  }
  
  
  /* vi_search_prev():
   *	Vi search history previous
   *	[?]
   */
  protected el_action_t
  vi_search_prev(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	return cv_search(el, ED_SEARCH_PREV_HISTORY);
  }
  
  
  /* vi_search_next():
   *	Vi search history next
   *	[/]
   */
  protected el_action_t
  vi_search_next(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	return cv_search(el, ED_SEARCH_NEXT_HISTORY);
  }
  
  
  /* vi_repeat_search_next():
   *	Vi repeat current search in the same search direction
   *	[n]
   */
  protected el_action_t
  vi_repeat_search_next(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_search.patlen == 0)
  		return CC_ERROR;
  	else
  		return cv_repeat_srch(el, el->el_search.patdir);
  }
  
  
  /* vi_repeat_search_prev():
   *	Vi repeat current search in the opposite search direction
   *	[N]
   */
  protected el_action_t
  vi_repeat_search_prev(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	if (el->el_search.patlen == 0)
  		return CC_ERROR;
  	else
  		return (cv_repeat_srch(el,
  		    el->el_search.patdir == ED_SEARCH_PREV_HISTORY ?
  		    ED_SEARCH_NEXT_HISTORY : ED_SEARCH_PREV_HISTORY));
  }
  
  
  /* vi_next_char():
   *	Vi move to the character specified next
   *	[f]
   */
  protected el_action_t
  vi_next_char(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	return cv_csearch(el, CHAR_FWD, -1, el->el_state.argument, 0);
  }
  
  
  /* vi_prev_char():
   *	Vi move to the character specified previous
   *	[F]
   */
  protected el_action_t
  vi_prev_char(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	return cv_csearch(el, CHAR_BACK, -1, el->el_state.argument, 0);
  }
  
  
  /* vi_to_next_char():
   *	Vi move up to the character specified next
   *	[t]
   */
  protected el_action_t
  vi_to_next_char(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	return cv_csearch(el, CHAR_FWD, -1, el->el_state.argument, 1);
  }
  
  
  /* vi_to_prev_char():
   *	Vi move up to the character specified previous
   *	[T]
   */
  protected el_action_t
  vi_to_prev_char(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	return cv_csearch(el, CHAR_BACK, -1, el->el_state.argument, 1);
  }
  
  
  /* vi_repeat_next_char():
   *	Vi repeat current character search in the same search direction
   *	[;]
   */
  protected el_action_t
  vi_repeat_next_char(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	return cv_csearch(el, el->el_search.chadir, el->el_search.chacha,
  		el->el_state.argument, el->el_search.chatflg);
  }
  
  
  /* vi_repeat_prev_char():
   *	Vi repeat current character search in the opposite search direction
   *	[,]
   */
  protected el_action_t
  vi_repeat_prev_char(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	el_action_t r;
  	int dir = el->el_search.chadir;
  
  	r = cv_csearch(el, -dir, el->el_search.chacha,
  		el->el_state.argument, el->el_search.chatflg);
  	el->el_search.chadir = dir;
  	return r;
  }
  
  
  /* vi_match():
   *	Vi go to matching () {} or []
   *	[%]
   */
  protected el_action_t
  vi_match(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	const wchar_t match_chars[] = L"()[]{}";
  	wchar_t *cp;
  	size_t delta, i, count;
  	wchar_t o_ch, c_ch;
  
  	*el->el_line.lastchar = '\0';		/* just in case */
  
  	i = wcscspn(el->el_line.cursor, match_chars);
  	o_ch = el->el_line.cursor[i];
  	if (o_ch == 0)
  		return CC_ERROR;
  	delta = wcschr(match_chars, o_ch) - match_chars;
  	c_ch = match_chars[delta ^ 1];
  	count = 1;
  	delta = 1 - (delta & 1) * 2;
  
  	for (cp = &el->el_line.cursor[i]; count; ) {
  		cp += delta;
  		if (cp < el->el_line.buffer || cp >= el->el_line.lastchar)
  			return CC_ERROR;
  		if (*cp == o_ch)
  			count++;
  		else if (*cp == c_ch)
  			count--;
  	}
  
  	el->el_line.cursor = cp;
  
  	if (el->el_chared.c_vcmd.action != NOP) {
  		/* NB posix says char under cursor should NOT be deleted
  		   for -ve delta - this is different to netbsd vi. */
  		if (delta > 0)
  			el->el_line.cursor++;
  		cv_delfini(el);
  		return CC_REFRESH;
  	}
  	return CC_CURSOR;
  }
  
  /* vi_undo_line():
   *	Vi undo all changes to line
   *	[U]
   */
  protected el_action_t
  vi_undo_line(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	cv_undo(el);
  	return hist_get(el);
  }
  
  /* vi_to_column():
   *	Vi go to specified column
   *	[|]
   * NB netbsd vi goes to screen column 'n', posix says nth character
   */
  protected el_action_t
  vi_to_column(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	el->el_line.cursor = el->el_line.buffer;
  	el->el_state.argument--;
  	return ed_next_char(el, 0);
  }
  
  /* vi_yank_end():
   *	Vi yank to end of line
   *	[Y]
   */
  protected el_action_t
  vi_yank_end(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	cv_yank(el, el->el_line.cursor,
  	    (int)(el->el_line.lastchar - el->el_line.cursor));
  	return CC_REFRESH;
  }
  
  /* vi_yank():
   *	Vi yank
   *	[y]
   */
  protected el_action_t
  vi_yank(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	return cv_action(el, YANK);
  }
  
  /* vi_comment_out():
   *	Vi comment out current command
   *	[#]
   */
  protected el_action_t
  vi_comment_out(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  
  	el->el_line.cursor = el->el_line.buffer;
  	c_insert(el, 1);
  	*el->el_line.cursor = '#';
  	re_refresh(el);
  	return ed_newline(el, 0);
  }
  
  /* vi_alias():
   *	Vi include shell alias
   *	[@]
   * NB: posix implies that we should enter insert mode, however
   * this is against historical precedent...
   */
  #ifdef __weak_reference
  __weakref_visible char *my_get_alias_text(const char *)
      __weak_reference(get_alias_text);
  #endif
  protected el_action_t
  vi_alias(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  #ifdef __weak_reference
  	char alias_name[3];
  	char *alias_text;
  
  	if (my_get_alias_text == 0) {
  		return CC_ERROR;
  	}
  
  	alias_name[0] = '_';
  	alias_name[2] = 0;
  	if (el_getc(el, &alias_name[1]) != 1)
  		return CC_ERROR;
  
  	alias_text = my_get_alias_text(alias_name);
  	if (alias_text != NULL)
  		el_wpush(el, ct_decode_string(alias_text, &el->el_scratch));
  	return CC_NORM;
  #else
  	return CC_ERROR;
  #endif
  }
  
  /* vi_to_history_line():
   *	Vi go to specified history file line.
   *	[G]
   */
  protected el_action_t
  vi_to_history_line(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	int sv_event_no = el->el_history.eventno;
  	el_action_t rval;
  
  
  	if (el->el_history.eventno == 0) {
  		 (void) wcsncpy(el->el_history.buf, el->el_line.buffer,
  		     EL_BUFSIZ);
  		 el->el_history.last = el->el_history.buf +
  			 (el->el_line.lastchar - el->el_line.buffer);
  	}
  
  	/* Lack of a 'count' means oldest, not 1 */
  	if (!el->el_state.doingarg) {
  		el->el_history.eventno = 0x7fffffff;
  		hist_get(el);
  	} else {
  		/* This is brain dead, all the rest of this code counts
  		 * upwards going into the past.  Here we need count in the
  		 * other direction (to match the output of fc -l).
  		 * I could change the world, but this seems to suffice.
  		 */
  		el->el_history.eventno = 1;
  		if (hist_get(el) == CC_ERROR)
  			return CC_ERROR;
  		el->el_history.eventno = 1 + el->el_history.ev.num
  					- el->el_state.argument;
  		if (el->el_history.eventno < 0) {
  			el->el_history.eventno = sv_event_no;
  			return CC_ERROR;
  		}
  	}
  	rval = hist_get(el);
  	if (rval == CC_ERROR)
  		el->el_history.eventno = sv_event_no;
  	return rval;
  }
  
  /* vi_histedit():
   *	Vi edit history line with vi
   *	[v]
   */
  protected el_action_t
  vi_histedit(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	int fd;
  	pid_t pid;
  	ssize_t st;
  	int status;
  	char tempfile[] = "/tmp/histedit.XXXXXXXXXX";
  	char *cp;
  	size_t len;
  	wchar_t *line;
  
  	if (el->el_state.doingarg) {
  		if (vi_to_history_line(el, 0) == CC_ERROR)
  			return CC_ERROR;
  	}
  
  	fd = mkstemp(tempfile);
  	if (fd == -1)
  		return CC_ERROR;
  	len = (size_t)(el->el_line.lastchar - el->el_line.buffer);
  #define TMP_BUFSIZ (EL_BUFSIZ * MB_LEN_MAX)
  	cp = malloc(TMP_BUFSIZ);
  	if (cp == NULL) {
  		close(fd);
  		unlink(tempfile);
  		return CC_ERROR;
  	}
  	line = reallocarray(NULL, len + 1, sizeof(*line));
  	if (line == NULL) {
  		close(fd);
  		unlink(tempfile);
  		free(cp);
  		return CC_ERROR;
  	}
  	wcsncpy(line, el->el_line.buffer, len);
  	line[len] = '\0';
  	wcstombs(cp, line, TMP_BUFSIZ - 1);
  	cp[TMP_BUFSIZ - 1] = '\0';
  	len = strlen(cp);
  	write(fd, cp, len);
  	write(fd, "\n", 1);
  	pid = fork();
  	switch (pid) {
  	case -1:
  		close(fd);
  		unlink(tempfile);
  		free(cp);
                  free(line);
  		return CC_ERROR;
  	case 0:
  		close(fd);
  		execlp("vi", "vi", tempfile, (char *)NULL);
  		exit(0);
  		/*NOTREACHED*/
  	default:
  		while (waitpid(pid, &status, 0) != pid)
  			continue;
  		lseek(fd, (off_t)0, SEEK_SET);
  		st = read(fd, cp, TMP_BUFSIZ - 1);
  		if (st > 0) {
  			cp[st] = '\0';
  			len = (size_t)(el->el_line.limit - el->el_line.buffer);
  			len = mbstowcs(el->el_line.buffer, cp, len);
  			if (len > 0 && el->el_line.buffer[len - 1] == '\n')
  				--len;
  		}
  		else
  			len = 0;
                  el->el_line.cursor = el->el_line.buffer;
                  el->el_line.lastchar = el->el_line.buffer + len;
  		free(cp);
                  free(line);
  		break;
  	}
  
  	close(fd);
  	unlink(tempfile);
  	/* return CC_REFRESH; */
  	return ed_newline(el, 0);
  }
  
  /* vi_history_word():
   *	Vi append word from previous input line
   *	[_]
   * Who knows where this one came from!
   * '_' in vi means 'entire current line', so 'cc' is a synonym for 'c_'
   */
  protected el_action_t
  vi_history_word(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	const wchar_t *wp = HIST_FIRST(el);
  	const wchar_t *wep, *wsp;
  	int len;
  	wchar_t *cp;
  	const wchar_t *lim;
  
  	if (wp == NULL)
  		return CC_ERROR;
  
  	wep = wsp = NULL;
  	do {
  		while (iswspace(*wp))
  			wp++;
  		if (*wp == 0)
  			break;
  		wsp = wp;
  		while (*wp && !iswspace(*wp))
  			wp++;
  		wep = wp;
  	} while ((!el->el_state.doingarg || --el->el_state.argument > 0)
  	    && *wp != 0);
  
  	if (wsp == NULL || (el->el_state.doingarg && el->el_state.argument != 0))
  		return CC_ERROR;
  
  	cv_undo(el);
  	len = (int)(wep - wsp);
  	if (el->el_line.cursor < el->el_line.lastchar)
  		el->el_line.cursor++;
  	c_insert(el, len + 1);
  	cp = el->el_line.cursor;
  	lim = el->el_line.limit;
  	if (cp < lim)
  		*cp++ = ' ';
  	while (wsp < wep && cp < lim)
  		*cp++ = *wsp++;
  	el->el_line.cursor = cp;
  
  	el->el_map.current = el->el_map.key;
  	return CC_REFRESH;
  }
  
  /* vi_redo():
   *	Vi redo last non-motion command
   *	[.]
   */
  protected el_action_t
  vi_redo(EditLine *el, wint_t c __attribute__((__unused__)))
  {
  	c_redo_t *r = &el->el_chared.c_redo;
  
  	if (!el->el_state.doingarg && r->count) {
  		el->el_state.doingarg = 1;
  		el->el_state.argument = r->count;
  	}
  
  	el->el_chared.c_vcmd.pos = el->el_line.cursor;
  	el->el_chared.c_vcmd.action = r->action;
  	if (r->pos != r->buf) {
  		if (r->pos + 1 > r->lim)
  			/* sanity */
  			r->pos = r->lim - 1;
  		r->pos[0] = 0;
  		el_wpush(el, r->buf);
  	}
  
  	el->el_state.thiscmd = r->cmd;
  	el->el_state.thisch = r->ch;
  	return (*el->el_map.func[r->cmd])(el, r->ch);
  }