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Update to NetBSD libedit (from Oct 1, 2003), adding some string
cleaning and history bug fixes. The code includes GNU libreadline
functionality, but the corresponding header files are not installed,
since some libreadline functions are missing. There are some minor API
changes, notably:

old: EditLine *el_init(const char *, FILE *, FILE *);
new: EditLine *el_init(const char *, FILE *, FILE *, FILE *);

old: HistEvent *history(History *h, int op, ...);
new: int history(History *h, HistEvent *ev, int op, ...); plus some
changes in operation names. See editline(3) for details.

Tested by djm@, mouring@, jmc@.

ok deraadt@

/*	$OpenBSD: common.c,v 1.6 2003/10/31 08:42:24 otto Exp $	*/
/*	$NetBSD: common.c,v 1.16 2003/08/07 16:44:30 agc 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"
#if !defined(lint) && !defined(SCCSID)
#if 0
static char sccsid[] = "@(#)common.c	8.1 (Berkeley) 6/4/93";
#else
static const char rcsid[] = "$OpenBSD: common.c,v 1.6 2003/10/31 08:42:24 otto Exp $";
#endif
#endif /* not lint && not SCCSID */

/*
 * common.c: Common Editor functions
 */
#include "el.h"

/* ed_end_of_file():
 *	Indicate end of file
 *	[^D]
 */
protected el_action_t
/*ARGSUSED*/
ed_end_of_file(EditLine *el, int c __attribute__((__unused__)))
{

	re_goto_bottom(el);
	*el->el_line.lastchar = '\0';
	return (CC_EOF);
}


/* ed_insert():
 *	Add character to the line
 *	Insert a character [bound to all insert keys]
 */
protected el_action_t
ed_insert(EditLine *el, int c)
{
	int count = el->el_state.argument;

	if (c == '\0')
		return (CC_ERROR);

	if (el->el_line.lastchar + el->el_state.argument >=
	    el->el_line.limit) {
		/* end of buffer space, try to allocate more */
		if (!ch_enlargebufs(el, (size_t) count))
			return CC_ERROR;	/* error allocating more */
	}

	if (count == 1) {
		if (el->el_state.inputmode == MODE_INSERT
		    || el->el_line.cursor >= el->el_line.lastchar)
			c_insert(el, 1);

		*el->el_line.cursor++ = c;
		re_fastaddc(el);		/* fast refresh for one char. */
	} else {
		if (el->el_state.inputmode != MODE_REPLACE_1)
			c_insert(el, el->el_state.argument);

		while (count-- && el->el_line.cursor < el->el_line.lastchar)
			*el->el_line.cursor++ = c;
		re_refresh(el);
	}

	if (el->el_state.inputmode == MODE_REPLACE_1)
		return vi_command_mode(el, 0);

	return (CC_NORM);
}


/* ed_delete_prev_word():
 *	Delete from beginning of current word to cursor
 *	[M-^?] [^W]
 */
protected el_action_t
/*ARGSUSED*/
ed_delete_prev_word(EditLine *el, int c __attribute__((__unused__)))
{
	char *cp, *p, *kp;

	if (el->el_line.cursor == el->el_line.buffer)
		return (CC_ERROR);

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

	for (p = cp, kp = el->el_chared.c_kill.buf; p < el->el_line.cursor; p++)
		*kp++ = *p;
	el->el_chared.c_kill.last = kp;

	c_delbefore(el, el->el_line.cursor - cp);	/* delete before dot */
	el->el_line.cursor = cp;
	if (el->el_line.cursor < el->el_line.buffer)
		el->el_line.cursor = el->el_line.buffer; /* bounds check */
	return (CC_REFRESH);
}


/* ed_delete_next_char():
 *	Delete character under cursor
 *	[^D] [x]
 */
protected el_action_t
/*ARGSUSED*/
ed_delete_next_char(EditLine *el, int c __attribute__((__unused__)))
{
#ifdef notdef			/* XXX */
#define	EL	el->el_line
	(void) fprintf(el->el_errlfile,
	    "\nD(b: %x(%s)  c: %x(%s) last: %x(%s) limit: %x(%s)\n",
	    EL.buffer, EL.buffer, EL.cursor, EL.cursor, EL.lastchar,
	    EL.lastchar, EL.limit, EL.limit);
#endif
	if (el->el_line.cursor == el->el_line.lastchar) {
			/* if I'm at the end */
		if (el->el_map.type == MAP_VI) {
			if (el->el_line.cursor == el->el_line.buffer) {
				/* if I'm also at the beginning */
#ifdef KSHVI
				return (CC_ERROR);
#else
				term_overwrite(el, STReof, 4);
					/* then do a EOF */
				term__flush();
				return (CC_EOF);
#endif
			} else {
#ifdef KSHVI
				el->el_line.cursor--;
#else
				return (CC_ERROR);
#endif
			}
		} else {
			if (el->el_line.cursor != el->el_line.buffer)
				el->el_line.cursor--;
			else
				return (CC_ERROR);
		}
	}
	c_delafter(el, el->el_state.argument);	/* delete after dot */
	if (el->el_line.cursor >= el->el_line.lastchar &&
	    el->el_line.cursor > el->el_line.buffer)
			/* bounds check */
		el->el_line.cursor = el->el_line.lastchar - 1;
	return (CC_REFRESH);
}


/* ed_kill_line():
 *	Cut to the end of line
 *	[^K] [^K]
 */
protected el_action_t
/*ARGSUSED*/
ed_kill_line(EditLine *el, int c __attribute__((__unused__)))
{
	char *kp, *cp;

	cp = el->el_line.cursor;
	kp = el->el_chared.c_kill.buf;
	while (cp < el->el_line.lastchar)
		*kp++ = *cp++;	/* copy it */
	el->el_chared.c_kill.last = kp;
			/* zap! -- delete to end */
	el->el_line.lastchar = el->el_line.cursor;
	return (CC_REFRESH);
}


/* ed_move_to_end():
 *	Move cursor to the end of line
 *	[^E] [^E]
 */
protected el_action_t
/*ARGSUSED*/
ed_move_to_end(EditLine *el, int c __attribute__((__unused__)))
{

	el->el_line.cursor = el->el_line.lastchar;
	if (el->el_map.type == MAP_VI) {
#ifdef VI_MOVE
		el->el_line.cursor--;
#endif
		if (el->el_chared.c_vcmd.action != NOP) {
			cv_delfini(el);
			return (CC_REFRESH);
		}
	}
	return (CC_CURSOR);
}


/* ed_move_to_beg():
 *	Move cursor to the beginning of line
 *	[^A] [^A]
 */
protected el_action_t
/*ARGSUSED*/
ed_move_to_beg(EditLine *el, int c __attribute__((__unused__)))
{

	el->el_line.cursor = el->el_line.buffer;

	if (el->el_map.type == MAP_VI) {
			/* We want FIRST non space character */
		while (isspace((unsigned char) *el->el_line.cursor))
			el->el_line.cursor++;
		if (el->el_chared.c_vcmd.action != NOP) {
			cv_delfini(el);
			return (CC_REFRESH);
		}
	}
	return (CC_CURSOR);
}


/* ed_transpose_chars():
 *	Exchange the character to the left of the cursor with the one under it
 *	[^T] [^T]
 */
protected el_action_t
ed_transpose_chars(EditLine *el, int c)
{

	if (el->el_line.cursor < el->el_line.lastchar) {
		if (el->el_line.lastchar <= &el->el_line.buffer[1])
			return (CC_ERROR);
		else
			el->el_line.cursor++;
	}
	if (el->el_line.cursor > &el->el_line.buffer[1]) {
		/* must have at least two chars entered */
		c = el->el_line.cursor[-2];
		el->el_line.cursor[-2] = el->el_line.cursor[-1];
		el->el_line.cursor[-1] = c;
		return (CC_REFRESH);
	} else
		return (CC_ERROR);
}


/* ed_next_char():
 *	Move to the right one character
 *	[^F] [^F]
 */
protected el_action_t
/*ARGSUSED*/
ed_next_char(EditLine *el, int c __attribute__((__unused__)))
{
	char *lim = el->el_line.lastchar;

	if (el->el_line.cursor >= lim ||
	    (el->el_line.cursor == lim - 1 &&
	    el->el_map.type == MAP_VI &&
	    el->el_chared.c_vcmd.action == NOP))
		return (CC_ERROR);

	el->el_line.cursor += el->el_state.argument;
	if (el->el_line.cursor > lim)
		el->el_line.cursor = lim;

	if (el->el_map.type == MAP_VI)
		if (el->el_chared.c_vcmd.action != NOP) {
			cv_delfini(el);
			return (CC_REFRESH);
		}
	return (CC_CURSOR);
}


/* ed_prev_word():
 *	Move to the beginning of the current word
 *	[M-b] [b]
 */
protected el_action_t
/*ARGSUSED*/
ed_prev_word(EditLine *el, int c __attribute__((__unused__)))
{

	if (el->el_line.cursor == el->el_line.buffer)
		return (CC_ERROR);

	el->el_line.cursor = c__prev_word(el->el_line.cursor,
	    el->el_line.buffer,
	    el->el_state.argument,
	    ce__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);
}


/* ed_prev_char():
 *	Move to the left one character
 *	[^B] [^B]
 */
protected el_action_t
/*ARGSUSED*/
ed_prev_char(EditLine *el, int c __attribute__((__unused__)))
{

	if (el->el_line.cursor > el->el_line.buffer) {
		el->el_line.cursor -= el->el_state.argument;
		if (el->el_line.cursor < el->el_line.buffer)
			el->el_line.cursor = el->el_line.buffer;

		if (el->el_map.type == MAP_VI)
			if (el->el_chared.c_vcmd.action != NOP) {
				cv_delfini(el);
				return (CC_REFRESH);
			}
		return (CC_CURSOR);
	} else
		return (CC_ERROR);
}


/* ed_quoted_insert():
 *	Add the next character typed verbatim
 *	[^V] [^V]
 */
protected el_action_t
ed_quoted_insert(EditLine *el, int c)
{
	int num;
	char tc;

	tty_quotemode(el);
	num = el_getc(el, &tc);
	c = (unsigned char) tc;
	tty_noquotemode(el);
	if (num == 1)
		return (ed_insert(el, c));
	else
		return (ed_end_of_file(el, 0));
}


/* ed_digit():
 *	Adds to argument or enters a digit
 */
protected el_action_t
ed_digit(EditLine *el, int c)
{

	if (!isdigit(c))
		return (CC_ERROR);

	if (el->el_state.doingarg) {
			/* if doing an arg, add this in... */
		if (el->el_state.lastcmd == EM_UNIVERSAL_ARGUMENT)
			el->el_state.argument = c - '0';
		else {
			if (el->el_state.argument > 1000000)
				return (CC_ERROR);
			el->el_state.argument =
			    (el->el_state.argument * 10) + (c - '0');
		}
		return (CC_ARGHACK);
	}

	return ed_insert(el, c);
}


/* ed_argument_digit():
 *	Digit that starts argument
 *	For ESC-n
 */
protected el_action_t
ed_argument_digit(EditLine *el, int c)
{

	if (!isdigit(c))
		return (CC_ERROR);

	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');
	} else {		/* else starting an argument */
		el->el_state.argument = c - '0';
		el->el_state.doingarg = 1;
	}
	return (CC_ARGHACK);
}


/* ed_unassigned():
 *	Indicates unbound character
 *	Bound to keys that are not assigned
 */
protected el_action_t
/*ARGSUSED*/
ed_unassigned(EditLine *el, int c __attribute__((__unused__)))
{

	return (CC_ERROR);
}


/**
 ** TTY key handling.
 **/

/* ed_tty_sigint():
 *	Tty interrupt character
 *	[^C]
 */
protected el_action_t
/*ARGSUSED*/
ed_tty_sigint(EditLine *el __attribute__((__unused__)), 
	      int c __attribute__((__unused__)))
{

	return (CC_NORM);
}


/* ed_tty_dsusp():
 *	Tty delayed suspend character
 *	[^Y]
 */
protected el_action_t
/*ARGSUSED*/
ed_tty_dsusp(EditLine *el __attribute__((__unused__)), 
	     int c __attribute__((__unused__)))
{

	return (CC_NORM);
}


/* ed_tty_flush_output():
 *	Tty flush output characters
 *	[^O]
 */
protected el_action_t
/*ARGSUSED*/
ed_tty_flush_output(EditLine *el __attribute__((__unused__)), 
		    int c __attribute__((__unused__)))
{

	return (CC_NORM);
}


/* ed_tty_sigquit():
 *	Tty quit character
 *	[^\]
 */
protected el_action_t
/*ARGSUSED*/
ed_tty_sigquit(EditLine *el __attribute__((__unused__)), 
	       int c __attribute__((__unused__)))
{

	return (CC_NORM);
}


/* ed_tty_sigtstp():
 *	Tty suspend character
 *	[^Z]
 */
protected el_action_t
/*ARGSUSED*/
ed_tty_sigtstp(EditLine *el __attribute__((__unused__)), 
	       int c __attribute__((__unused__)))
{

	return (CC_NORM);
}


/* ed_tty_stop_output():
 *	Tty disallow output characters
 *	[^S]
 */
protected el_action_t
/*ARGSUSED*/
ed_tty_stop_output(EditLine *el __attribute__((__unused__)), 
		   int c __attribute__((__unused__)))
{

	return (CC_NORM);
}


/* ed_tty_start_output():
 *	Tty allow output characters
 *	[^Q]
 */
protected el_action_t
/*ARGSUSED*/
ed_tty_start_output(EditLine *el __attribute__((__unused__)), 
		    int c __attribute__((__unused__)))
{

	return (CC_NORM);
}


/* ed_newline():
 *	Execute command
 *	[^J]
 */
protected el_action_t
/*ARGSUSED*/
ed_newline(EditLine *el, int c __attribute__((__unused__)))
{

	re_goto_bottom(el);
	*el->el_line.lastchar++ = '\n';
	*el->el_line.lastchar = '\0';
	return (CC_NEWLINE);
}


/* ed_delete_prev_char():
 *	Delete the character to the left of the cursor
 *	[^?]
 */
protected el_action_t
/*ARGSUSED*/
ed_delete_prev_char(EditLine *el, int c __attribute__((__unused__)))
{

	if (el->el_line.cursor <= el->el_line.buffer)
		return (CC_ERROR);

	c_delbefore(el, el->el_state.argument);
	el->el_line.cursor -= el->el_state.argument;
	if (el->el_line.cursor < el->el_line.buffer)
		el->el_line.cursor = el->el_line.buffer;
	return (CC_REFRESH);
}


/* ed_clear_screen():
 *	Clear screen leaving current line at the top
 *	[^L]
 */
protected el_action_t
/*ARGSUSED*/
ed_clear_screen(EditLine *el, int c __attribute__((__unused__)))
{

	term_clear_screen(el);	/* clear the whole real screen */
	re_clear_display(el);	/* reset everything */
	return (CC_REFRESH);
}


/* ed_redisplay():
 *	Redisplay everything
 *	^R
 */
protected el_action_t
/*ARGSUSED*/
ed_redisplay(EditLine *el __attribute__((__unused__)), 
	     int c __attribute__((__unused__)))
{

	return (CC_REDISPLAY);
}


/* ed_start_over():
 *	Erase current line and start from scratch
 *	[^G]
 */
protected el_action_t
/*ARGSUSED*/
ed_start_over(EditLine *el, int c __attribute__((__unused__)))
{

	ch_reset(el);
	return (CC_REFRESH);
}


/* ed_sequence_lead_in():
 *	First character in a bound sequence
 *	Placeholder for external keys
 */
protected el_action_t
/*ARGSUSED*/
ed_sequence_lead_in(EditLine *el __attribute__((__unused__)), 
		    int c __attribute__((__unused__)))
{

	return (CC_NORM);
}


/* ed_prev_history():
 *	Move to the previous history line
 *	[^P] [k]
 */
protected el_action_t
/*ARGSUSED*/
ed_prev_history(EditLine *el, int c __attribute__((__unused__)))
{
	char beep = 0;
	int sv_event = el->el_history.eventno;

	el->el_chared.c_undo.len = -1;
	*el->el_line.lastchar = '\0';		/* just in case */

	if (el->el_history.eventno == 0) {	/* save the current buffer
						 * away */
		(void) strncpy(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);
	}
	el->el_history.eventno += el->el_state.argument;

	if (hist_get(el) == CC_ERROR) {
		if (el->el_map.type == MAP_VI) {
			el->el_history.eventno = sv_event;
			return CC_ERROR;
		}
		beep = 1;
		/* el->el_history.eventno was fixed by first call */
		(void) hist_get(el);
	}
	if (beep)
		return CC_REFRESH_BEEP;
	return CC_REFRESH;
}


/* ed_next_history():
 *	Move to the next history line
 *	[^N] [j]
 */
protected el_action_t
/*ARGSUSED*/
ed_next_history(EditLine *el, int c __attribute__((__unused__)))
{
	el_action_t beep = CC_REFRESH, rval;

	el->el_chared.c_undo.len = -1;
	*el->el_line.lastchar = '\0';	/* just in case */

	el->el_history.eventno -= el->el_state.argument;

	if (el->el_history.eventno < 0) {
		el->el_history.eventno = 0;
		beep = CC_REFRESH_BEEP;
	}
	rval = hist_get(el);
	if (rval == CC_REFRESH)
		return beep;
	return rval;

}


/* ed_search_prev_history():
 *	Search previous in history for a line matching the current
 *	next search history [M-P] [K]
 */
protected el_action_t
/*ARGSUSED*/
ed_search_prev_history(EditLine *el, int c __attribute__((__unused__)))
{
	const char *hp;
	int h;
	bool_t found = 0;

	el->el_chared.c_vcmd.action = NOP;
	el->el_chared.c_undo.len = -1;
	*el->el_line.lastchar = '\0';	/* just in case */
	if (el->el_history.eventno < 0) {
#ifdef DEBUG_EDIT
		(void) fprintf(el->el_errfile,
		    "e_prev_search_hist(): eventno < 0;\n");
#endif
		el->el_history.eventno = 0;
		return (CC_ERROR);
	}
	if (el->el_history.eventno == 0) {
		(void) strncpy(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);
	}
	if (el->el_history.ref == NULL)
		return (CC_ERROR);

	hp = HIST_FIRST(el);
	if (hp == NULL)
		return (CC_ERROR);

	c_setpat(el);		/* Set search pattern !! */

	for (h = 1; h <= el->el_history.eventno; h++)
		hp = HIST_NEXT(el);

	while (hp != NULL) {
#ifdef SDEBUG
		(void) fprintf(el->el_errfile, "Comparing with \"%s\"\n", hp);
#endif
		if ((strncmp(hp, el->el_line.buffer, (size_t)
			    (el->el_line.lastchar - el->el_line.buffer)) ||
			hp[el->el_line.lastchar - el->el_line.buffer]) &&
		    c_hmatch(el, hp)) {
			found++;
			break;
		}
		h++;
		hp = HIST_NEXT(el);
	}

	if (!found) {
#ifdef SDEBUG
		(void) fprintf(el->el_errfile, "not found\n");
#endif
		return (CC_ERROR);
	}
	el->el_history.eventno = h;

	return (hist_get(el));
}


/* ed_search_next_history():
 *	Search next in history for a line matching the current
 *	[M-N] [J]
 */
protected el_action_t
/*ARGSUSED*/
ed_search_next_history(EditLine *el, int c __attribute__((__unused__)))
{
	const char *hp;
	int h;
	bool_t found = 0;

	el->el_chared.c_vcmd.action = NOP;
	el->el_chared.c_undo.len = -1;
	*el->el_line.lastchar = '\0';	/* just in case */

	if (el->el_history.eventno == 0)
		return (CC_ERROR);

	if (el->el_history.ref == NULL)
		return (CC_ERROR);

	hp = HIST_FIRST(el);
	if (hp == NULL)
		return (CC_ERROR);

	c_setpat(el);		/* Set search pattern !! */

	for (h = 1; h < el->el_history.eventno && hp; h++) {
#ifdef SDEBUG
		(void) fprintf(el->el_errfile, "Comparing with \"%s\"\n", hp);
#endif
		if ((strncmp(hp, el->el_line.buffer, (size_t)
			    (el->el_line.lastchar - el->el_line.buffer)) ||
			hp[el->el_line.lastchar - el->el_line.buffer]) &&
		    c_hmatch(el, hp))
			found = h;
		hp = HIST_NEXT(el);
	}

	if (!found) {		/* is it the current history number? */
		if (!c_hmatch(el, el->el_history.buf)) {
#ifdef SDEBUG
			(void) fprintf(el->el_errfile, "not found\n");
#endif
			return (CC_ERROR);
		}
	}
	el->el_history.eventno = found;

	return (hist_get(el));
}


/* ed_prev_line():
 *	Move up one line
 *	Could be [k] [^p]
 */
protected el_action_t
/*ARGSUSED*/
ed_prev_line(EditLine *el, int c __attribute__((__unused__)))
{
	char *ptr;
	int nchars = c_hpos(el);

	/*
         * Move to the line requested
         */
	if (*(ptr = el->el_line.cursor) == '\n')
		ptr--;

	for (; ptr >= el->el_line.buffer; ptr--)
		if (*ptr == '\n' && --el->el_state.argument <= 0)
			break;

	if (el->el_state.argument > 0)
		return (CC_ERROR);

	/*
         * Move to the beginning of the line
         */
	for (ptr--; ptr >= el->el_line.buffer && *ptr != '\n'; ptr--)
		continue;

	/*
         * Move to the character requested
         */
	for (ptr++;
	    nchars-- > 0 && ptr < el->el_line.lastchar && *ptr != '\n';
	    ptr++)
		continue;

	el->el_line.cursor = ptr;
	return (CC_CURSOR);
}


/* ed_next_line():
 *	Move down one line
 *	Could be [j] [^n]
 */
protected el_action_t
/*ARGSUSED*/
ed_next_line(EditLine *el, int c __attribute__((__unused__)))
{
	char *ptr;
	int nchars = c_hpos(el);

	/*
         * Move to the line requested
         */
	for (ptr = el->el_line.cursor; ptr < el->el_line.lastchar; ptr++)
		if (*ptr == '\n' && --el->el_state.argument <= 0)
			break;

	if (el->el_state.argument > 0)
		return (CC_ERROR);

	/*
         * Move to the character requested
         */
	for (ptr++;
	    nchars-- > 0 && ptr < el->el_line.lastchar && *ptr != '\n';
	    ptr++)
		continue;

	el->el_line.cursor = ptr;
	return (CC_CURSOR);
}


/* ed_command():
 *	Editline extended command
 *	[M-X] [:]
 */
protected el_action_t
/*ARGSUSED*/
ed_command(EditLine *el, int c __attribute__((__unused__)))
{
	char tmpbuf[EL_BUFSIZ];
	int tmplen;

	tmplen = c_gets(el, tmpbuf, "\n: ");
	term__putc('\n');

	if (tmplen < 0 || (tmpbuf[tmplen] = 0, parse_line(el, tmpbuf)) == -1)
		term_beep(el);

	el->el_map.current = el->el_map.key;
	re_clear_display(el);
	return CC_REFRESH;
}