/*
 * libutil - C utility functions
 *
 * Written in 2020 by Lucas
 *
 * To the extent possible under law, the author(s) have dedicated all
 * copyright and related and neighboring rights to this software to the
 * public domain worldwide. This software is distributed without any
 * warranty.
 *
 * You should have received a copy of the CC0 Public Domain Dedication
 * along with this software. If not, see
 * <http://creativecommons.org/publicdomain/zero/1.0/>.
 */
/*
 * 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");
}