syserror.cpp

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// 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.
 
#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif
 
#include <tinyformat.h>
#include <util/syserror.h>
 
#include <cstring>
 
#if defined(WIN32)
#include <codecvt>
#include <locale>
#include <windows.h>
#endif
 
std::string SysErrorString(int err) {
    char buf[1024];
    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);
    } else {
        return strprintf("Unknown error (%d)", err);
    }
}
 
#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