/*
 * Copyright (c) 2011, 2012 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * error/gnu_error.c
 * Prints an error message to stderr and optionally exits the process.
 */

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

void gnu_error(int status, int errnum, const char *format, ...)
{
	flockfile(stderr);

	fprintf_unlocked(stderr, "%s: ", program_invocation_name);

	va_list list;
	va_start(list, format);
	vfprintf_unlocked(stderr, format, list);
	va_end(list);

	if ( errnum )
		fprintf_unlocked(stderr, ": %s", strerror(errnum));
	fprintf_unlocked(stderr, "\n");

	funlockfile(stderr);

	if ( status )
		exit(status);
}