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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: sig.c,v 1.10 2003/10/31 08:42:24 otto Exp $	*/
/*	$NetBSD: sig.c,v 1.11 2003/08/07 16:44:33 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[] = "@(#)sig.c	8.1 (Berkeley) 6/4/93";
#else
static const char rcsid[] = "$OpenBSD: sig.c,v 1.10 2003/10/31 08:42:24 otto Exp $";
#endif
#endif /* not lint && not SCCSID */

/*
 * sig.c: Signal handling stuff.
 *	  our policy is to trap all signals, set a good state
 *	  and pass the ball to our caller.
 */
#include "el.h"
#include <stdlib.h>

private EditLine *sel = NULL;

private const int sighdl[] = {
#define	_DO(a)	(a),
	ALLSIGS
#undef	_DO
	- 1
};

private void sig_handler(int);

/* sig_handler():
 *	This is the handler called for all signals
 *	XXX: we cannot pass any data so we just store the old editline
 *	state in a private variable
 */
private void
sig_handler(int signo)
{
	int i;
	sigset_t nset, oset;

	(void) sigemptyset(&nset);
	(void) sigaddset(&nset, signo);
	(void) sigprocmask(SIG_BLOCK, &nset, &oset);

	switch (signo) {
	case SIGCONT:
		tty_rawmode(sel);
		if (ed_redisplay(sel, 0) == CC_REFRESH)
			re_refresh(sel);
		term__flush();
		break;

	case SIGWINCH:
		el_resize(sel);
		break;

	default:
		tty_cookedmode(sel);
		break;
	}

	for (i = 0; sighdl[i] != -1; i++)
		if (signo == sighdl[i])
			break;

	(void) signal(signo, sel->el_signal[i]);
	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
	(void) kill(0, signo);
}


/* sig_init():
 *	Initialize all signal stuff
 */
protected int
sig_init(EditLine *el)
{
	int i;
	sigset_t nset, oset;

	(void) sigemptyset(&nset);
#define	_DO(a) (void) sigaddset(&nset, a);
	ALLSIGS
#undef	_DO
	    (void) sigprocmask(SIG_BLOCK, &nset, &oset);

#define	SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(el_signalhandler_t))

	el->el_signal = (el_signalhandler_t *) el_malloc(SIGSIZE);
	if (el->el_signal == NULL)
		return (-1);
	for (i = 0; sighdl[i] != -1; i++)
		el->el_signal[i] = SIG_ERR;

	(void) sigprocmask(SIG_SETMASK, &oset, NULL);

	return (0);
}


/* sig_end():
 *	Clear all signal stuff
 */
protected void
sig_end(EditLine *el)
{

	el_free((ptr_t) el->el_signal);
	el->el_signal = NULL;
}


/* sig_set():
 *	set all the signal handlers
 */
protected void
sig_set(EditLine *el)
{
	int i;
	sigset_t nset, oset;

	(void) sigemptyset(&nset);
#define	_DO(a) (void) sigaddset(&nset, a);
	ALLSIGS
#undef	_DO
	    (void) sigprocmask(SIG_BLOCK, &nset, &oset);

	for (i = 0; sighdl[i] != -1; i++) {
		el_signalhandler_t s;
		/* This could happen if we get interrupted */
		if ((s = signal(sighdl[i], sig_handler)) != sig_handler)
			el->el_signal[i] = s;
	}
	sel = el;
	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
}


/* sig_clr():
 *	clear all the signal handlers
 */
protected void
sig_clr(EditLine *el)
{
	int i;
	sigset_t nset, oset;

	(void) sigemptyset(&nset);
#define	_DO(a) (void) sigaddset(&nset, a);
	ALLSIGS
#undef	_DO
	    (void) sigprocmask(SIG_BLOCK, &nset, &oset);

	for (i = 0; sighdl[i] != -1; i++)
		if (el->el_signal[i] != SIG_ERR)
			(void) signal(sighdl[i], el->el_signal[i]);

	sel = NULL;		/* we are going to die if the handler is
				 * called */
	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
}