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 __FBSDID("$FreeBSD$"); 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 40 static void usage(void) __dead2; 41 42 int 43 main(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 68 static void 69 usage(void) 70 { 71 fprintf(stderr, "usage: perror number\n"); 72 exit(1); 73 } 74 75