2973057493
Of course, strerror_r() may still fail with ERANGE. Although the POSIX specification said this could fail with EINVAL and doing this likely indicates invalid use of errno, most other implementations permitted it, various POSIX testsuites require it to work (matching the older sys_errlist array) and apparently some applications depend on it. PR: standards/151316 MFC after: 1 week
127 lines
3.4 KiB
C
127 lines
3.4 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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* 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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#if defined(NLS)
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#include <nl_types.h>
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#endif
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#include <limits.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#define UPREFIX "Unknown error"
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/*
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* Define a buffer size big enough to describe a 64-bit signed integer
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* converted to ASCII decimal (19 bytes), with an optional leading sign
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* (1 byte); finally, we get the prefix, delimiter (": ") and a trailing
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* NUL from UPREFIX.
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*/
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#define EBUFSIZE (20 + 2 + sizeof(UPREFIX))
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/*
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* Doing this by hand instead of linking with stdio(3) avoids bloat for
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* statically linked binaries.
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*/
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static void
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errstr(int num, char *uprefix, char *buf, size_t len)
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{
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char *t;
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unsigned int uerr;
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char tmp[EBUFSIZE];
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t = tmp + sizeof(tmp);
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*--t = '\0';
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uerr = (num >= 0) ? num : -num;
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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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*--t = ' ';
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*--t = ':';
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strlcpy(buf, uprefix, len);
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strlcat(buf, t, len);
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}
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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 retval = 0;
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#if defined(NLS)
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int saved_errno = errno;
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nl_catd catd;
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catd = catopen("libc", NL_CAT_LOCALE);
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#endif
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if (errnum < 0 || errnum >= sys_nerr) {
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errstr(errnum,
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#if defined(NLS)
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catgets(catd, 1, 0xffff, UPREFIX),
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#else
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UPREFIX,
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#endif
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strerrbuf, buflen);
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retval = EINVAL;
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} else {
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if (strlcpy(strerrbuf,
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#if defined(NLS)
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catgets(catd, 1, errnum, sys_errlist[errnum]),
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#else
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sys_errlist[errnum],
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#endif
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buflen) >= buflen)
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retval = ERANGE;
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}
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#if defined(NLS)
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catclose(catd);
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errno = saved_errno;
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#endif
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return (retval);
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}
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char *
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strerror(int num)
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{
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static char ebuf[NL_TEXTMAX];
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if (strerror_r(num, ebuf, sizeof(ebuf)) != 0)
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errno = EINVAL;
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return (ebuf);
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}
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