/*	$OpenBSD: vi.c,v 1.2 1997/01/16 05:18:52 millert 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#if !defined(lint) && !defined(SCCSID)
#if 0
static char sccsid[] = "@(#)vi.c	8.1 (Berkeley) 6/4/93";
#else
static char rcsid[] = "$OpenBSD: vi.c,v 1.2 1997/01/16 05:18:52 millert Exp $";
#endif
#endif /* not lint && not SCCSID */

/*
 * vi.c: Vi mode commands.
 */
#include "sys.h"
#include "el.h"

private el_action_t cv_action __P((EditLine *, int));

/* cv_action():
 *	Handle vi actions.
 */
private el_action_t
cv_action(el, c)
    EditLine *el;
    int c;
{
    register char *cp, *kp;

    if (el->el_chared.c_vcmd.action & DELETE) {
	el->el_chared.c_vcmd.action = NOP;
	el->el_chared.c_vcmd.pos = 0;
	
	el->el_chared.c_undo.isize = 0;
	el->el_chared.c_undo.dsize = 0;
	kp = el->el_chared.c_undo.buf;
	for (cp = el->el_line.buffer; cp < el->el_line.lastchar; cp++) {
	    *kp++ = *cp;
	    el->el_chared.c_undo.dsize++;
	}
		
	el->el_chared.c_undo.action = INSERT;
	el->el_chared.c_undo.ptr  = el->el_line.buffer;
	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;

#ifdef notdef
    /*
     * I don't think that this is needed. But we keep it for now
     */
    else if (el_chared.c_vcmd.action == NOP) {
	el->el_chared.c_vcmd.pos = el->el_line.cursor;
	el->el_chared.c_vcmd.action = c;
	return CC_ARGHACK;
    }
    else {
	el->el_chared.c_vcmd.action = 0;
	el->el_chared.c_vcmd.pos = 0;
	return CC_ERROR;
    }
#endif
}


/* cv_paste():
 *	Paste previous deletion before or after the cursor
 */
protected el_action_t
cv_paste(el, c)
    EditLine *el;
    int c;
{
    char *ptr;
    c_undo_t *un = &el->el_chared.c_undo;
#ifdef DEBUG_PASTE
    (void) fprintf(el->el_errfile, "Paste: %x \"%s\" +%d -%d\n", 
		   un->action, un->buf, un->isize, un->dsize);
#endif
    if (un->isize == 0)
	return CC_ERROR;

    if (!c && el->el_line.cursor < el->el_line.lastchar)
	el->el_line.cursor++;
    ptr = el->el_line.cursor;
	
    c_insert(el, un->isize);
    if (el->el_line.cursor + un->isize > el->el_line.lastchar)
	return CC_ERROR;
    (void) memcpy(ptr, un->buf, un->isize);
    return CC_REFRESH;
}


/* vi_paste_next(): 
 *	Vi paste previous deletion to the right of the cursor
 *	[p]
 */
protected el_action_t
/*ARGSUSED*/
vi_paste_next(el, c)
    EditLine *el;
    int c;
{
    return cv_paste(el, 0);
}


/* vi_paste_prev(): 
 *	Vi paste previous deletion to the left of the cursor
 *	[P]
 */
protected el_action_t
/*ARGSUSED*/
vi_paste_prev(el, c)
    EditLine *el;
    int c;
{
    return cv_paste(el, 1);
}


/* vi_prev_space_word(): 
 *	Vi move to the previous space delimited word
 *	[B]
 */
protected el_action_t
/*ARGSUSED*/
vi_prev_space_word(el, c)
    EditLine *el;
    int c;
{
    if (el->el_line.cursor == el->el_line.buffer)
	return CC_ERROR;

    el->el_line.cursor = cv_prev_word(el, el->el_line.cursor, 
				      el->el_line.buffer, 
			 	      el->el_state.argument, 
				      cv__isword); 

    if (el->el_chared.c_vcmd.action & DELETE) {
	cv_delfini(el);
	return CC_REFRESH;
    }

    return CC_CURSOR;
}


/* vi_prev_word(): 
 *	Vi move to the previous word
 *	[B]
 */
protected el_action_t
/*ARGSUSED*/
vi_prev_word(el, c)
    EditLine *el;
    int c;
{
    if (el->el_line.cursor == el->el_line.buffer)
	return CC_ERROR;

    el->el_line.cursor = cv_prev_word(el, el->el_line.cursor, 
				      el->el_line.buffer, 
			 	      el->el_state.argument, 
				      ce__isword); 

    if (el->el_chared.c_vcmd.action & DELETE) {
	cv_delfini(el);
	return CC_REFRESH;
    }

    return CC_CURSOR;
}


/* vi_next_space_word(): 
 *	Vi move to the next space delimited word
 *	[W]
 */
protected el_action_t
/*ARGSUSED*/
vi_next_space_word(el, c)
    EditLine *el;
    int c;
{
    if (el->el_line.cursor == el->el_line.lastchar)
	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 & DELETE) {
	    cv_delfini(el);
	    return CC_REFRESH;
	}

    return CC_CURSOR;
}

/* vi_next_word(): 
 *	Vi move to the next word
 *	[w]
 */
protected el_action_t
/*ARGSUSED*/
vi_next_word(el, c)
    EditLine *el;
    int c;
{
    if (el->el_line.cursor == el->el_line.lastchar)
	return CC_ERROR;

    el->el_line.cursor = cv_next_word(el, el->el_line.cursor, 
				      el->el_line.lastchar, 
				      el->el_state.argument,
				      ce__isword);

    if (el->el_map.type == MAP_VI)
	if (el->el_chared.c_vcmd.action & DELETE) {
	    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(el, c)
    EditLine *el;
    int c;
{
    if (el->el_line.cursor < el->el_line.lastchar) {
	c = *el->el_line.cursor;
	if (isupper(c))
	    *el->el_line.cursor++ = tolower(c);
	else if (islower(c))
	    *el->el_line.cursor++ = toupper(c);
	else
	    el->el_line.cursor++;
	re_fastaddc(el);
	return CC_NORM;
    }
    return CC_ERROR;
}


/* vi_change_meta(): 
 *	Vi change prefix command
 *	[c]
 */
protected el_action_t
/*ARGSUSED*/
vi_change_meta(el, c)
    EditLine *el;
    int c;
{
    /*
     * 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
/*ARGSUSED*/
vi_insert_at_bol(el, c)
    EditLine *el;
    int c;
{
    el->el_line.cursor = el->el_line.buffer;
    el->el_chared.c_vcmd.ins = el->el_line.cursor;

    el->el_chared.c_undo.ptr = el->el_line.cursor;
    el->el_chared.c_undo.action = DELETE;

    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
/*ARGSUSED*/
vi_replace_char(el, c)
    EditLine *el;
    int c;
{
    el->el_map.current = el->el_map.key;
    el->el_state.inputmode = MODE_REPLACE_1;
    el->el_chared.c_undo.action = CHANGE;
    el->el_chared.c_undo.ptr = el->el_line.cursor;
    el->el_chared.c_undo.isize = 0;
    el->el_chared.c_undo.dsize = 0;
    return CC_NORM;
}


/* vi_replace_mode(): 
 *	Vi enter replace mode
 *	[R]
 */
protected el_action_t
/*ARGSUSED*/
vi_replace_mode(el, c)
    EditLine *el;
    int c;
{
    el->el_map.current = el->el_map.key;
    el->el_state.inputmode = MODE_REPLACE;
    el->el_chared.c_undo.action = CHANGE;
    el->el_chared.c_undo.ptr = el->el_line.cursor;
    el->el_chared.c_undo.isize = 0;
    el->el_chared.c_undo.dsize = 0;
    return CC_NORM;
}


/* vi_substitute_char(): 
 *	Vi replace character under the cursor and enter insert mode
 *	[r]
 */
protected el_action_t
/*ARGSUSED*/
vi_substitute_char(el, c)
    EditLine *el;
    int c;
{
    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
/*ARGSUSED*/
vi_substitute_line(el, c)
    EditLine *el;
    int c;
{
    (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
/*ARGSUSED*/
vi_change_to_eol(el, c)
    EditLine *el;
    int c;
{
    (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
/*ARGSUSED*/
vi_insert(el, c)
    EditLine *el;
    int c;
{
    el->el_map.current = el->el_map.key;

    el->el_chared.c_vcmd.ins = el->el_line.cursor;
    el->el_chared.c_undo.ptr = el->el_line.cursor;
    el->el_chared.c_undo.action = DELETE;

    return CC_NORM;
}


/* vi_add():
 *	Vi enter insert mode after the cursor 
 *	[a]
 */
protected el_action_t
/*ARGSUSED*/
vi_add(el, c)
    EditLine *el;
    int c;
{
    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;

    el->el_chared.c_vcmd.ins = el->el_line.cursor;
    el->el_chared.c_undo.ptr = el->el_line.cursor;
    el->el_chared.c_undo.action = DELETE;

    return ret;
}


/* vi_add_at_eol():
 *	Vi enter insert mode at end of line
 *	[A]
 */
protected el_action_t
/*ARGSUSED*/
vi_add_at_eol(el, c)
    EditLine *el;
    int c;
{
    el->el_map.current = el->el_map.key;
    el->el_line.cursor = el->el_line.lastchar;

    /* Mark where insertion begins */
    el->el_chared.c_vcmd.ins = el->el_line.lastchar; 
    el->el_chared.c_undo.ptr = el->el_line.lastchar;
    el->el_chared.c_undo.action = DELETE;
    return CC_CURSOR;
}


/* vi_delete_meta():
 *	Vi delete prefix command 
 *	[d]
 */
protected el_action_t
/*ARGSUSED*/
vi_delete_meta(el, c)
    EditLine *el;
    int c;
{
    return cv_action(el, DELETE);
}


/* vi_end_word():
 *	Vi move to the end of the current space delimited word 
 *	[E] 
 */
protected el_action_t
/*ARGSUSED*/
vi_end_word(el, c)
    EditLine *el;
    int c;
{
    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);

    if (el->el_chared.c_vcmd.action & DELETE) {
	el->el_line.cursor++;
	cv_delfini(el);
	return CC_REFRESH;
    }

    return CC_CURSOR;
}


/* vi_to_end_word():
 *	Vi move to the end of the current word
 *	[e]
 */
protected el_action_t
/*ARGSUSED*/
vi_to_end_word(el, c)
    EditLine *el;
    int c;
{
    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);

    if (el->el_chared.c_vcmd.action & DELETE) {
	el->el_line.cursor++;
	cv_delfini(el);
	return CC_REFRESH;
    }

    return CC_CURSOR;
}


/* vi_undo():
 *	Vi undo last change
 *	[u]
 */
protected el_action_t
/*ARGSUSED*/
vi_undo(el, c)
    EditLine *el;
    int c;
{
    char *cp, *kp;
    char temp;
    int	 i, size;
    c_undo_t *un = &el->el_chared.c_undo;

#ifdef DEBUG_UNDO
    (void) fprintf(el->el_errfile, "Undo: %x \"%s\" +%d -%d\n", 
		   un->action, un->buf, un->isize, un->dsize);
#endif
    switch (un->action) {
    case DELETE:
	if (un->dsize == 0) 
	    return CC_NORM;

	(void) memcpy(un->buf, un->ptr, un->dsize);
	for (cp = un->ptr; cp <= el->el_line.lastchar; cp++)
	    *cp = cp[un->dsize];

	el->el_line.lastchar -= un->dsize;
	el->el_line.cursor   =  un->ptr;
	
	un->action = INSERT;
	un->isize = un->dsize;
	un->dsize = 0;
	break;

    case DELETE|INSERT:
	size = un->isize - un->dsize;
	if (size > 0) 
	    i = un->dsize;
	else 
	    i = un->isize;
	cp = un->ptr;
	kp = un->buf;
	while (i-- > 0) {
	    temp = *kp;
	    *kp++ = *cp;
	    *cp++ = temp;
	}
	if (size > 0) {
	    el->el_line.cursor = cp;
	    c_insert(el, size);
	    while (size-- > 0 && cp < el->el_line.lastchar) {
		temp = *kp;
		*kp++ = *cp;
		*cp++ = temp;
	    }
	}
	else if (size < 0) {
	    size = -size;
	    for (; cp <= el->el_line.lastchar; cp++) {
		*kp++ = *cp;
		*cp = cp[size];
	    }
	    el->el_line.lastchar -= size;
	}
	el->el_line.cursor = un->ptr;
	i = un->dsize;
	un->dsize = un->isize;
	un->isize = i;
	break;

    case INSERT:
	if (un->isize == 0) 
	    return CC_NORM;

	el->el_line.cursor = un->ptr;
	c_insert(el, un->isize);
	memcpy(un->ptr, un->buf, un->isize);
	un->action = DELETE;
	un->dsize = un->isize;
	un->isize = 0;
	break;

    case CHANGE:
	if (un->isize == 0) 
	    return CC_NORM;

	el->el_line.cursor = un->ptr;
	size = (int) (el->el_line.cursor - el->el_line.lastchar); 
	if (size < un->isize)
	    size = un->isize;
	cp = un->ptr;
	kp = un->buf;
	for(i = 0; i < size; i++) {
	    temp = *kp;
	    *kp++ = *cp;
	    *cp++ = temp;
	}
	un->dsize = 0;
	break;

    default:
	return CC_ERROR;
    }

    return CC_REFRESH;
}


/* vi_command_mode():
 *	Vi enter command mode (use alternative key bindings)
 *	[<ESC>]
 */
protected el_action_t
/*ARGSUSED*/
vi_command_mode(el, c)
    EditLine *el;
    int c;
{
    int size;
    /* [Esc] cancels pending action */
    el->el_chared.c_vcmd.ins = 0;
    el->el_chared.c_vcmd.action = NOP;	
    el->el_chared.c_vcmd.pos = 0;

    el->el_state.doingarg = 0;
    size = el->el_chared.c_undo.ptr - el->el_line.cursor;
    if (size < 0)
	size = -size;
    if (el->el_chared.c_undo.action == (INSERT|DELETE) ||
        el->el_chared.c_undo.action == DELETE)
	el->el_chared.c_undo.dsize = size;
    else
	el->el_chared.c_undo.isize = size;

    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(el, c)
    EditLine *el;
    int c;
{
    if (el->el_state.doingarg) {
	if (el->el_state.argument > 1000000)
	    return CC_ERROR;
	el->el_state.argument = 
		(el->el_state.argument * 10) + (c - '0');
	return CC_ARGHACK;
    }
    else {
	el->el_line.cursor = el->el_line.buffer;
	if (el->el_chared.c_vcmd.action & DELETE) {
	   cv_delfini(el);
	   return CC_REFRESH;
        }
	return CC_CURSOR;
    }
}


/* vi_delete_prev_char():
 * 	Vi move to previous character (backspace) 
 *	[^H]
 */ 
protected el_action_t
/*ARGSUSED*/
vi_delete_prev_char(el, c)
    EditLine *el;
    int c;
{
    if (el->el_chared.c_vcmd.ins == 0) 
	return CC_ERROR;

    if (el->el_chared.c_vcmd.ins > 
	el->el_line.cursor - el->el_state.argument)
	return CC_ERROR;

    c_delbefore(el, el->el_state.argument);	
    el->el_line.cursor -= el->el_state.argument;

    return CC_REFRESH;
} /* end v_del_char_prev  */


/* vi_list_or_eof():
 *	Vi list choices for completion or indicate end of file if empty line
 *	[^D]
 */
protected el_action_t
/*ARGSUSED*/
vi_list_or_eof(el, c)
    EditLine *el;
    int c;
{
#ifdef notyet
    if (el->el_line.cursor == el->el_line.lastchar && 
	el->el_line.cursor == el->el_line.buffer) {
#endif
	term_overwrite(el, STReof, 4);	/* then do a EOF */
	term__flush();
	return CC_EOF;
#ifdef notyet
    }
    else {
	re_goto_bottom(el);
	*el->el_line.lastchar = '\0';	/* just in case */
	return CC_LIST_CHOICES;
    }
#endif
}


/* vi_kill_line_prev():
 *	Vi cut from beginning of line to cursor 
 *	[^U]
 */
protected el_action_t
/*ARGSUSED*/
vi_kill_line_prev(el, c)
    EditLine *el;
    int c;
{
    char *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, 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
/*ARGSUSED*/
vi_search_prev(el, c)
    EditLine *el;
    int c;
{
    return cv_search(el, ED_SEARCH_PREV_HISTORY);
}


/* vi_search_next():
 *	Vi search history next
 *	[/]
 */
protected el_action_t
/*ARGSUSED*/
vi_search_next(el, c)
    EditLine *el;
    int c;
{
    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
/*ARGSUSED*/
vi_repeat_search_next(el, c)
    EditLine *el;
    int c;
{
    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]
 */
/*ARGSUSED*/
protected el_action_t
vi_repeat_search_prev(el, c)
    EditLine *el;
    int c;
{
    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
/*ARGSUSED*/
vi_next_char(el, c)
    EditLine *el;
    int c;
{
    char ch;

    if (el_getc(el, &ch) != 1)
	return ed_end_of_file(el, 0);

    el->el_search.chadir = CHAR_FWD;
    el->el_search.chacha = ch;

    return cv_csearch_fwd(el, ch, el->el_state.argument, 0);

}


/* vi_prev_char():
 *	Vi move to the character specified previous
 *	[F]
 */
protected el_action_t
/*ARGSUSED*/
vi_prev_char(el, c)
    EditLine *el;
    int c;
{
    char ch;

    if (el_getc(el, &ch) != 1)
	return ed_end_of_file(el, 0);

    el->el_search.chadir = CHAR_BACK;
    el->el_search.chacha = ch;

    return cv_csearch_back(el, ch, el->el_state.argument, 0);
}


/* vi_to_next_char():
 *	Vi move up to the character specified next
 *	[t]
 */
protected el_action_t
/*ARGSUSED*/
vi_to_next_char(el, c)
    EditLine *el;
    int c;
{
    char ch;

    if (el_getc(el, &ch) != 1)
	return ed_end_of_file(el, 0);

    return cv_csearch_fwd(el, ch, el->el_state.argument, 1);

}


/* vi_to_prev_char():
 *	Vi move up to the character specified previous
 *	[T]
 */
protected el_action_t
/*ARGSUSED*/
vi_to_prev_char(el, c)
    EditLine *el;
    int c;
{
    char ch;
    if (el_getc(el, &ch) != 1)
	return ed_end_of_file(el, 0);

    return cv_csearch_back(el, ch, el->el_state.argument, 1);
}


/* vi_repeat_next_char():
 *	Vi repeat current character search in the same search direction
 *	[;]
 */
protected el_action_t
/*ARGSUSED*/
vi_repeat_next_char(el, c)
    EditLine *el;
    int c;
{
    if (el->el_search.chacha == 0)
	return CC_ERROR;

    return el->el_search.chadir == CHAR_FWD ? 
	cv_csearch_fwd(el, el->el_search.chacha, el->el_state.argument, 0) : 
        cv_csearch_back(el, el->el_search.chacha, el->el_state.argument, 0);
}


/* vi_repeat_prev_char():
 *	Vi repeat current character search in the opposite search direction
 *	[,]
 */
protected el_action_t
/*ARGSUSED*/
vi_repeat_prev_char(el, c)
    EditLine *el;
    int c;
{
    if (el->el_search.chacha == 0)
	return CC_ERROR;

    return el->el_search.chadir == CHAR_BACK ? 
	cv_csearch_fwd(el, el->el_search.chacha, el->el_state.argument, 0) : 
        cv_csearch_back(el, el->el_search.chacha, el->el_state.argument, 0);
}