Source/WTF/wtf/win/LoggingWin.cpp

/*
 * Copyright (C) 2021 Apple Inc. All Rights Reserved.
 *
 * 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 "Logging.h"

#if !LOG_DISABLED || !RELEASE_LOG_DISABLED

#include "LogInitialization.h"
#include <windows.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/WTFString.h>

namespace WTF {

String logLevelString()
{
#if !LOG_DISABLED
    static constexpr const char* loggingEnvironmentVariable = "WTFLogging";
    DWORD length = GetEnvironmentVariableA(loggingEnvironmentVariable, 0, 0);
    if (!length)
        return emptyString();

    Vector<char> buffer(length);

    if (!GetEnvironmentVariableA(loggingEnvironmentVariable, buffer.data(), length))
        return emptyString();

    return String::fromLatin1(buffer.data());
#else
    return String();
#endif
}

} // namespace WTF

#endif // !LOG_DISABLED || !RELEASE_LOG_DISABLED