5a98f074e6
strerror_r(). Doing this allows us to ensure that strerror_r() always fills the supplied buffer regardless of EINVAL or ERANGE errors. strerror()'s semantics have changed slightly such that an argument of 0 is now considered invalid and errno is set to EINVAL. Remove internal regression test for strerror() and strerror_r(). This will be reincarnated in src/tools/regression/lib/libc/string. In strerror(3), add a comment about strerror()'s bogus return type. PR: 44356
99 lines
3.3 KiB
C
99 lines
3.3 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 <errno.h>
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#include <stdio.h>
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#include <string.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 and a trailing NUL from UPREFIX.
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*/
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#define EBUFSIZE (20 + sizeof(UPREFIX))
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/* Don't link to stdio(3) to avoid bloat for statically linked binaries. */
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static void
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errstr(int num, char *buf, size_t len)
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{
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unsigned int uerr;
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char *p, *t;
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char tmp[EBUFSIZE];
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if (strlcpy(buf, UPREFIX, len) >= len)
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return;
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t = tmp;
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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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for (p = buf + strlen(UPREFIX); t > tmp && p < buf + len - 1;)
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*p++ = *--t;
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*p = '\0';
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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;
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retval = 0;
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if (errnum < 1 || errnum >= sys_nerr) {
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errstr(errnum, strerrbuf, buflen);
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retval = EINVAL;
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} else if (strlcpy(strerrbuf, sys_errlist[errnum], buflen) >= buflen)
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retval = ERANGE;
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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[EBUFSIZE];
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if (num > 0 && num < sys_nerr)
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return ((char *)sys_errlist[num]);
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errno = EINVAL;
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errstr(num, ebuf, sizeof(ebuf));
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return (ebuf);
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}
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