79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/*-
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* Copyright (c) 2009 Advanced Computing Technologies LLC
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* Written by: George V. Neville-Neil <gnn@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/errno.h>
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#define MAX_ERR 256
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static void
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usage()
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{
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fprintf(stderr, "usage: perror number\n");
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fprintf(stderr, "number must be between 1 and %d\n", ELAST);
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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char errstr[MAX_ERR];
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char *cp;
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int errnum;
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if (argc != 2)
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usage();
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errnum = strtol(argv[1], &cp, 0);
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if (((errnum == 0) && (errno == EINVAL)) || (*cp != '\0')) {
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fprintf(stderr, "Argument %s not a number.\n", argv[1]);
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usage();
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}
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if ((errnum <=0) || (errnum > ELAST)) {
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fprintf(stderr, "Number %d out of range.\n", errnum);
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usage();
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}
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if (strerror_r(errnum, errstr, sizeof(errstr)) < 0) {
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fprintf(stderr, "Could not find error number %d.\n", errnum);
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usage();
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}
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printf("Error %d is \"%s\"\n", errnum, errstr);
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exit(0);
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}
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