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/*
* Copyright (C) 2021 Red Hat Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 APPLE INC. ``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 APPLE INC. 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 "config.h"
#include <wtf/SafeStrerror.h>
#include <cstring>
#include <type_traits>
#include <wtf/Platform.h>
#include <wtf/text/CString.h>
namespace WTF {
CString safeStrerror(int errnum)
{
constexpr size_t bufferLength = 1024;
std::span<char> cstringBuffer;
auto result = CString::newUninitialized(bufferLength, cstringBuffer);
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
#if OS(WINDOWS)
strerror_s(cstringBuffer.data(), cstringBuffer.size(), errnum);
#else
auto ret = strerror_r(errnum, cstringBuffer.data(), cstringBuffer.size());
if constexpr (std::is_same<decltype(ret), char*>::value) {
// We have GNU strerror_r(), which returns char*. This may or may not be a pointer into
// cstringBuffer. We also have to be careful because this has to compile even if ret is
// an int, hence the reinterpret_casts.
char* message = reinterpret_cast<char*>(ret);
if (message != cstringBuffer.data())
strncpy(cstringBuffer.data(), message, cstringBuffer.size());
} else {
// We have POSIX strerror_r, which returns int and may fail.
if (ret)
snprintf(cstringBuffer.data(), cstringBuffer.size(), "%s %d", "Unknown error", errnum);
}
#endif // OS(WINDOWS)
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
return result;
}
} // namespace WTF
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