145 lines
4.6 KiB
C
145 lines
4.6 KiB
C
/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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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 <string.h>
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#include <errno.h>
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int
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strerror_r(int errnum, char *strerrbuf, size_t buflen)
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{
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int len;
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if ((errnum >= 0) && (errnum < sys_nerr)) {
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len = strlcpy(strerrbuf, (char *)sys_errlist[errnum], buflen);
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return ((len < buflen) ? 0 : ERANGE);
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}
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return (EINVAL);
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}
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char *
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strerror(num)
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int num;
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{
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char *p, *t;
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unsigned int uerr;
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static char const unknown_prefix[] = "Unknown error: ";
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/*
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* Define a buffer size big enough to describe a 64-bit
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* number in ASCII decimal (19), with optional leading sign
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* (+1) and trailing NUL (+1).
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*/
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# define NUMLEN 21
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# define EBUFLEN (sizeof unknown_prefix + NUMLEN)
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char tmp[NUMLEN]; /* temporary number */
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static char ebuf[EBUFLEN]; /* error message */
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if ((num >= 0) && (num < sys_nerr))
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return ((char *)sys_errlist[num]);
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/*
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* Set errno to EINVAL per P1003.1-200x Draft June 14, 2001.
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*/
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errno = EINVAL;
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/*
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* Print unknown errno by hand so we don't link to stdio(3).
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* This collects the ASCII digits in reverse order.
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*/
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uerr = (num > 0) ? num : -num;
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t = tmp;
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do {
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*t++ = "0123456789"[uerr % 10];
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} while (uerr /= 10);
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if (num < 0)
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*t++ = '-';
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/*
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* Copy the "unknown" message and the number into the caller
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* supplied buffer, inverting the number string.
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*/
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strcpy(ebuf, unknown_prefix);
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for (p = ebuf + sizeof unknown_prefix - 1; t > tmp; )
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*p++ = *--t;
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*p = '\0';
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return (ebuf);
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}
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#ifdef STANDALONE_TEST
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#include <limits.h>
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main()
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{
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char mybuf[64];
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int ret;
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errno = 0;
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printf("strerror(0) yeilds: %s\n", strerror(0));
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printf("strerror(1) yeilds: %s\n", strerror(1));
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printf("strerror(47) yeilds: %s\n", strerror(47));
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printf("strerror(sys_nerr - 1) yeilds: %s\n", strerror(sys_nerr - 1));
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printf("errno = %d\n", errno); errno = 0;
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printf("strerror(sys_nerr) yeilds: %s\n", strerror(sys_nerr));
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printf("errno = %d\n", errno); errno = 0;
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printf("strerror(437) yeilds: %s\n", strerror(437));
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printf("errno = %d\n", errno); errno = 0;
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printf("strerror(LONG_MAX) yeilds: %s\n", strerror(LONG_MAX));
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printf("strerror(LONG_MIN) yeilds: %s\n", strerror(LONG_MIN));
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printf("strerror(ULONG_MAX) yeilds: %s\n", strerror(ULONG_MAX));
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memset(mybuf, '*', 63); mybuf[63] = '\0';
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strerror_r(11, mybuf, 64);
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printf("strerror_r(11) yeilds: %s\n", mybuf);
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memset(mybuf, '*', 63); mybuf[63] = '\0';
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ret = strerror_r(1234, mybuf, 64);
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printf("strerror_r(1234) returns %d (%s)\n", ret, mybuf);
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memset(mybuf, '*', 63); mybuf[63] = '\0';
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ret = strerror_r(1, mybuf, 10);
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printf("strerror_r on short buffer returns %d (%s)\n", ret, mybuf);
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}
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#endif
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