1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #include <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <err.h> 35 #include <locale.h> 36 #include <sys/errno.h> 37 38 static void usage(void) __dead2; 39 40 int 41 main(int argc, char **argv) 42 { 43 char *cp; 44 char *errstr; 45 long errnum; 46 47 (void) setlocale(LC_MESSAGES, ""); 48 if (argc != 2) 49 usage(); 50 51 errno = 0; 52 53 errnum = strtol(argv[1], &cp, 0); 54 55 if (errno != 0) 56 err(1, NULL); 57 58 if ((errstr = strerror(errnum)) == NULL) 59 err(1, NULL); 60 61 printf("%s\n", errstr); 62 63 exit(0); 64 } 65 66 static void 67 usage(void) 68 { 69 fprintf(stderr, "usage: perror number\n"); 70 exit(1); 71 } 72 73