/*	$OpenBSD: verr.c,v 1.11 2016/03/13 18:34:20 guenther Exp $ */
/*-
 * Copyright (c) 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.
 */
/*
 * Inspired by OpenBSD's `err.h' header, found at
 * http://man.openbsd.org/err.3
 * http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gen/verr.c
 */

#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "err.h"

extern const char *__progname;

void
err(int eval, const char *fmt, ...)
{
	va_list ap;
	int saved_errno = errno;

	fprintf(stderr, "%s: ", __progname);
	if (fmt != NULL) {
		va_start(ap, fmt);
		vfprintf(stderr, fmt, ap);
		va_end(ap);
		fprintf(stderr, ": ");
	}
	fprintf(stderr, "%s\n", strerror(saved_errno));

	exit(eval);
}

void
errx(int eval, const char *fmt, ...)
{
	va_list ap;

	fprintf(stderr, "%s: ", __progname);
	if (fmt != NULL) {
		va_start(ap, fmt);
		vfprintf(stderr, fmt, ap);
		va_end(ap);
	}
	fprintf(stderr, "\n");

	exit(eval);
}

void
warn(const char *fmt, ...)
{
	va_list ap;
	int saved_errno = errno;

	fprintf(stderr, "%s: ", __progname);
	if (fmt != NULL) {
		va_start(ap, fmt);
		vfprintf(stderr, fmt, ap);
		va_end(ap);
		fprintf(stderr, ": ");
	}
	fprintf(stderr, "%s\n", strerror(saved_errno));
}

void
warnx(const char *fmt, ...)
{
	va_list ap;

	fprintf(stderr, "%s: ", __progname);
	if (fmt != NULL) {
		va_start(ap, fmt);
		vfprintf(stderr, fmt, ap);
		va_end(ap);
	}
	fprintf(stderr, "\n");
}