blob: f4c64421136e5aa8b4f100c85c4ba2ced68d8dfc [file] [log] [blame]
/*
* Copyright (C) 2020 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 <wtf/OSLogPrintStream.h>
namespace WTF {
#if OS(DARWIN)
OSLogPrintStream::OSLogPrintStream(os_log_t log, os_log_type_t logType)
: m_log(log)
, m_logType(logType)
, m_string("initial string... lol")
{
}
OSLogPrintStream::~OSLogPrintStream()
{ }
std::unique_ptr<OSLogPrintStream> OSLogPrintStream::open(const char* subsystem, const char* category, os_log_type_t logType)
{
os_log_t log = os_log_create(subsystem, category);
return makeUnique<OSLogPrintStream>(log, logType);
}
void OSLogPrintStream::vprintf(const char* format, va_list argList)
{
auto lock = holdLock(m_stringLock);
size_t offset = m_offset;
size_t freeBytes = m_string.length() - offset;
va_list backup;
va_copy(backup, argList);
size_t bytesWritten = vsnprintf(m_string.mutableData() + offset, freeBytes, format, argList);
if (UNLIKELY(bytesWritten >= freeBytes)) {
size_t newLength = std::max(bytesWritten + m_string.length(), m_string.length() * 2);
m_string.grow(newLength);
freeBytes = newLength - offset;
bytesWritten = vsnprintf(m_string.mutableData() + offset, freeBytes, format, backup);
ASSERT(bytesWritten < freeBytes);
}
size_t newOffset = offset + bytesWritten;
char* buffer = m_string.mutableData();
bool loggedText = false;
do {
if (buffer[offset] == '\n') {
// Set the new line to a null character so os_log stops copying there.
buffer[offset] = '\0';
os_log_with_type(m_log, m_logType, "%{public}s", buffer);
buffer += offset + 1;
newOffset -= offset + 1;
offset = 0;
loggedText = true;
} else
offset++;
} while (offset < newOffset);
if (loggedText)
memmove(m_string.mutableData(), buffer, newOffset);
m_offset = newOffset;
}
#endif
} // namespace WTF