1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2009 Hudson River Trading LLC
5 * Written by: George V. Neville-Neil <gnn@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: stable/11/usr.bin/perror/perror.c 330449 2018-03-05 07:26:05Z eadler $");
32
33#include <stdio.h>
34#include <stdlib.h>
35#include <string.h>
36#include <err.h>
37#include <locale.h>
38#include <sys/errno.h>
39
40static void usage(void);
41
42int
43main(int argc, char **argv)
44{
45	char *cp;
46	char *errstr;
47	long errnum;
48
49	(void) setlocale(LC_MESSAGES, "");
50	if (argc != 2)
51		usage();
52
53	errno = 0;
54
55	errnum = strtol(argv[1], &cp, 0);
56
57	if (errno != 0)
58		err(1, NULL);
59
60	if ((errstr = strerror(errnum)) == NULL)
61		err(1, NULL);
62
63	printf("%s\n", errstr);
64
65	exit(0);
66}
67
68static void
69usage(void)
70{
71	fprintf(stderr, "usage: perror number\n");
72	exit(1);
73}
74
75