/*	$Id: err.c,v 1.3 2001/08/10 15:54:56 sandro Exp $	*/

/*
 * Copyright (c) 1997-2001 Sandro Sigala.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/*
 * 4.4BSD err(), warn() functions reimplementation.
 */

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

#include "err.h"

/* The name of the running program. */
extern char *progname;

void err(int status, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	verr(status, fmt, ap);
	va_end(ap);
}

void verr(int status, const char *fmt, va_list ap)
{
	int olderrno = errno;

	fprintf(stderr, "%s: ", progname);
	if (fmt != NULL) {
		vfprintf(stderr, fmt, ap);
		fprintf(stderr, ": ");
	}
	fprintf(stderr, "%s\n", strerror(olderrno));

	exit(status);
}

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

	va_start(ap, fmt);
	verrx(status, fmt, ap);
	va_end(ap);
}

void verrx(int status, const char *fmt, va_list ap)
{
	fprintf(stderr, "%s: ", progname);
	if (fmt != NULL)
		vfprintf(stderr, fmt, ap);
	fputc('\n', stderr);

	exit(status);
}

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

	va_start(ap, fmt);
	vwarn(fmt, ap);
	va_end(ap);
}

void vwarn(const char *fmt, va_list ap)
{
	int olderrno = errno;

	fprintf(stderr, "%s: ", progname);
	if (fmt != NULL) {
		vfprintf(stderr, fmt, ap);
		fprintf(stderr, ": ");
	}
	fprintf(stderr, "%s\n", strerror(olderrno));
}

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

	va_start(ap, fmt);
	vwarnx(fmt, ap);
	va_end(ap);
}

void vwarnx(const char *fmt, va_list ap)
{
	fprintf(stderr, "%s: ", progname);
	if (fmt != NULL)
		vfprintf(stderr, fmt, ap);
	fputc('\n', stderr);
}