90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
/*
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* Copyright (C) 2020 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/OSLogPrintStream.h>
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namespace WTF {
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#if OS(DARWIN)
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OSLogPrintStream::OSLogPrintStream(os_log_t log, os_log_type_t logType)
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: m_log(log)
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, m_logType(logType)
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, m_string("initial string... lol")
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{
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}
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OSLogPrintStream::~OSLogPrintStream()
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{ }
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std::unique_ptr<OSLogPrintStream> OSLogPrintStream::open(const char* subsystem, const char* category, os_log_type_t logType)
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{
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os_log_t log = os_log_create(subsystem, category);
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return makeUnique<OSLogPrintStream>(log, logType);
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}
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void OSLogPrintStream::vprintf(const char* format, va_list argList)
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{
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Locker lock { m_stringLock };
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size_t offset = m_offset;
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size_t freeBytes = m_string.length() - offset;
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va_list backup;
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va_copy(backup, argList);
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size_t bytesWritten = vsnprintf(m_string.mutableData() + offset, freeBytes, format, argList);
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if (UNLIKELY(bytesWritten >= freeBytes)) {
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size_t newLength = std::max(bytesWritten + m_string.length(), m_string.length() * 2);
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m_string.grow(newLength);
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freeBytes = newLength - offset;
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bytesWritten = vsnprintf(m_string.mutableData() + offset, freeBytes, format, backup);
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ASSERT(bytesWritten < freeBytes);
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}
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size_t newOffset = offset + bytesWritten;
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char* buffer = m_string.mutableData();
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bool loggedText = false;
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do {
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if (buffer[offset] == '\n') {
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// Set the new line to a null character so os_log stops copying there.
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buffer[offset] = '\0';
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os_log_with_type(m_log, m_logType, "%{public}s", buffer);
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buffer += offset + 1;
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newOffset -= offset + 1;
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offset = 0;
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loggedText = true;
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} else
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offset++;
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} while (offset < newOffset);
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if (loggedText)
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memmove(m_string.mutableData(), buffer, newOffset);
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m_offset = newOffset;
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}
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#endif
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} // namespace WTF
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