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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* util/support/strerror_r.c - strerror_r compatibility shim */
/*
* Copyright (C) 2014 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <k5-platform.h>
#undef strerror_r
#if defined(_WIN32)
/* Implement strerror_r in terms of strerror_s. */
int
k5_strerror_r(int errnum, char *buf, size_t buflen)
{
int st;
st = strerror_s(buf, buflen, errnum);
if (st != 0) {
errno = st;
return -1;
}
}
#elif !defined(HAVE_STRERROR_R)
/* Implement strerror_r in terms of strerror (not thread-safe). */
int
k5_strerror_r(int errnum, char *buf, size_t buflen)
{
if (strlcpy(buf, strerror(errnum), buflen) >= buflen) {
errno = ERANGE;
return -1;
}
return 0;
}
#elif defined(STRERROR_R_CHAR_P)
/*
* Implement the POSIX strerror_r API in terms of the GNU strerror_r, which
* returns a pointer to either the caller buffer or a constant string. This is
* the default version on glibc systems when _GNU_SOURCE is defined.
*/
int
k5_strerror_r(int errnum, char *buf, size_t buflen)
{
const char *str;
str = strerror_r(errnum, buf, buflen);
if (str != buf) {
if (strlcpy(buf, str, buflen) >= buflen) {
errno = ERANGE;
return -1;
}
}
return 0;
}
#else
/* Define a stub in terms of the real strerror_r, just to simplify the library
* export list. This shouldn't get used. */
int
k5_strerror_r(int errnum, char *buf, size_t buflen)
{
return strerror_r(errnum, buf, buflen);
}
#endif
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