fuzz coverage

// Copyright (c) 2020-2022 The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <bitcoin-build-config.h> // IWYU pragma: keep

#include <tinyformat.h>

#include <util/syserror.h>

#include <cstring>

#include <string>

#if defined(WIN32)

#include <windows.h>

#include <locale>

#include <codecvt>

#endif

std::string SysErrorString(int err)

{

    char buf[1024];

    /* Too bad there are three incompatible implementations of the

     * thread-safe strerror. */

    const char *s = nullptr;

#ifdef WIN32

    if (strerror_s(buf, sizeof(buf), err) == 0) s = buf;

#else

#ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */

    s = strerror_r(err, buf, sizeof(buf));

#else /* POSIX variant always returns message in buffer */

    if (strerror_r(err, buf, sizeof(buf)) == 0) s = buf;

#endif

#endif

    if (s != nullptr) {

        return strprintf("%s (%d)", s, err);

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#define strprintf tfm::format

    } else {

        return strprintf("Unknown error (%d)", err);

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#define strprintf tfm::format

    }

}

#if defined(WIN32)

std::string Win32ErrorString(int err)

{

    wchar_t buf[256];

    buf[0] = 0;

    if(FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,

                       nullptr, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

                       buf, ARRAYSIZE(buf), nullptr))

    {

        return strprintf("%s (%d)", std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>,wchar_t>().to_bytes(buf), err);

    }

    else

    {

        return strprintf("Unknown error (%d)", err);

    }

}

#endif