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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: hist.h,v 1.7 2003/10/31 08:42:24 otto Exp $	*/
/*	$NetBSD: hist.h,v 1.10 2003/08/07 16:44:31 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.
 *
 *	@(#)hist.h	8.1 (Berkeley) 6/4/93
 */

/*
 * el.hist.c: History functions
 */
#ifndef _h_el_hist
#define	_h_el_hist

#include "histedit.h"

typedef int (*hist_fun_t)(ptr_t, HistEvent *, int, ...);

typedef struct el_history_t {
	char		*buf;		/* The history buffer		*/
	size_t		sz;		/* Size of history buffer	*/
	char		*last;		/* The last character		*/
	int		 eventno;	/* Event we are looking for	*/
	ptr_t		 ref;		/* Argument for history fcns	*/
	hist_fun_t	 fun;		/* Event access			*/
	HistEvent	 ev;		/* Event cookie			*/
} el_history_t;

#define	HIST_FUN(el, fn, arg)	\
    ((((*(el)->el_history.fun) ((el)->el_history.ref, &(el)->el_history.ev, \
	fn, arg)) == -1) ? NULL : (el)->el_history.ev.str)

#define	HIST_NEXT(el)		HIST_FUN(el, H_NEXT, NULL)
#define	HIST_FIRST(el)		HIST_FUN(el, H_FIRST, NULL)
#define	HIST_LAST(el)		HIST_FUN(el, H_LAST, NULL)
#define	HIST_PREV(el)		HIST_FUN(el, H_PREV, NULL)
#define	HIST_SET(el, num)	HIST_FUN(el, H_SET, num)
#define	HIST_LOAD(el, fname)	HIST_FUN(el, H_LOAD fname)
#define	HIST_SAVE(el, fname)	HIST_FUN(el, H_SAVE fname)

protected int		hist_init(EditLine *);
protected void		hist_end(EditLine *);
protected el_action_t	hist_get(EditLine *);
protected int		hist_set(EditLine *, hist_fun_t, ptr_t);
protected int		hist_command(EditLine *, int, const char **);
protected int		hist_enlargebuf(EditLine *, size_t, size_t);

#endif /* _h_el_hist */