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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/* util/support/strerror_r.c - strerror_r compatibility shim */
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/*
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* Copyright (C) 2014 by the Massachusetts Institute of Technology.
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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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*
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* * 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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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <k5-platform.h>
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#undef strerror_r
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#if defined(_WIN32)
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/* Implement strerror_r in terms of strerror_s. */
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int
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k5_strerror_r(int errnum, char *buf, size_t buflen)
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{
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int st;
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st = strerror_s(buf, buflen, errnum);
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if (st != 0) {
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errno = st;
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return -1;
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}
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return 0;
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}
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#elif !defined(HAVE_STRERROR_R)
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/* Implement strerror_r in terms of strerror (not thread-safe). */
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int
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k5_strerror_r(int errnum, char *buf, size_t buflen)
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{
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if (strlcpy(buf, strerror(errnum), buflen) >= buflen) {
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errno = ERANGE;
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return -1;
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}
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return 0;
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}
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#elif defined(STRERROR_R_CHAR_P)
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/*
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* Implement the POSIX strerror_r API in terms of the GNU strerror_r, which
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* returns a pointer to either the caller buffer or a constant string. This is
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* the default version on glibc systems when _GNU_SOURCE is defined.
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*/
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int
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k5_strerror_r(int errnum, char *buf, size_t buflen)
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{
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const char *str;
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str = strerror_r(errnum, buf, buflen);
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if (str != buf) {
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if (strlcpy(buf, str, buflen) >= buflen) {
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errno = ERANGE;
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return -1;
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}
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}
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return 0;
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}
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#else
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/* Define a stub in terms of the real strerror_r, just to simplify the library
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* export list. This shouldn't get used. */
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int
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k5_strerror_r(int errnum, char *buf, size_t buflen)
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{
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return strerror_r(errnum, buf, buflen);
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}
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#endif
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