/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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 <errno.h>
#include <signal.h>

int
sigaddset(sigset_t *set, int signo)
{

	if (signo <= 0 || signo > _SIG_MAXSIG) {
		errno = EINVAL;
		return (-1);
	}
	set->__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo);
	return (0);
}

int
sigdelset(sigset_t *set, int signo)
{

	if (signo <= 0 || signo > _SIG_MAXSIG) {
		errno = EINVAL;
		return (-1);
	}
	set->__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo);
	return (0);
}

int
sigemptyset(sigset_t *set)
{
	int i;

	for (i = 0; i < _SIG_WORDS; i++)
		set->__bits[i] = 0;
	return (0);
}

int
sigfillset(sigset_t *set)
{
	int i;

	for (i = 0; i < _SIG_WORDS; i++)
		set->__bits[i] = ~0U;
	return (0);
}

int
sigorset(sigset_t *dest, const sigset_t *left, const sigset_t *right)
{
	int i;

	for (i = 0; i < _SIG_WORDS; i++)
		dest->__bits[i] = left->__bits[i] | right->__bits[i];
	return (0);
}

int
sigandset(sigset_t *dest, const sigset_t *left, const sigset_t *right)
{
	int i;

	for (i = 0; i < _SIG_WORDS; i++)
		dest->__bits[i] = left->__bits[i] & right->__bits[i];
	return (0);
}

int
sigisemptyset(const sigset_t *set)
{
	int i;

	for (i = 0; i < _SIG_WORDS; i++)
		if (set->__bits[i] != 0)
			return (0);
	return (1);
}

int
sigismember(const sigset_t *set, int signo)
{

	if (signo <= 0 || signo > _SIG_MAXSIG) {
		errno = EINVAL;
		return (-1);
	}
	return ((set->__bits[_SIG_WORD(signo)] & _SIG_BIT(signo)) ? 1 : 0);
}