mirror of
https://github.com/darlinghq/darling-WTF.git
synced 2024-11-23 11:59:47 +00:00
138 lines
4.4 KiB
C++
138 lines
4.4 KiB
C++
/*
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* Copyright (C) 2012 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/StringPrintStream.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <wtf/FastMalloc.h>
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namespace WTF {
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StringPrintStream::StringPrintStream()
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: m_buffer(m_inlineBuffer)
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, m_next(0)
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, m_size(sizeof(m_inlineBuffer))
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{
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m_buffer[0] = 0; // Make sure that we always have a null terminator.
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}
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StringPrintStream::~StringPrintStream()
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{
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if (m_buffer == m_inlineBuffer)
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return;
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fastFree(m_buffer);
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}
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void StringPrintStream::vprintf(const char* format, va_list argList)
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{
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ASSERT_WITH_SECURITY_IMPLICATION(m_next < m_size);
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ASSERT(!m_buffer[m_next]);
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va_list firstPassArgList;
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va_copy(firstPassArgList, argList);
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int numberOfBytesNotIncludingTerminatorThatWouldHaveBeenWritten =
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vsnprintf(m_buffer + m_next, m_size - m_next, format, firstPassArgList);
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va_end(firstPassArgList);
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int numberOfBytesThatWouldHaveBeenWritten =
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numberOfBytesNotIncludingTerminatorThatWouldHaveBeenWritten + 1;
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if (m_next + numberOfBytesThatWouldHaveBeenWritten <= m_size) {
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m_next += numberOfBytesNotIncludingTerminatorThatWouldHaveBeenWritten;
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return; // This means that vsnprintf() succeeded.
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}
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increaseSize(m_next + numberOfBytesThatWouldHaveBeenWritten);
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int numberOfBytesNotIncludingTerminatorThatWereWritten =
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vsnprintf(m_buffer + m_next, m_size - m_next, format, argList);
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int numberOfBytesThatWereWritten = numberOfBytesNotIncludingTerminatorThatWereWritten + 1;
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ASSERT_UNUSED(numberOfBytesThatWereWritten, m_next + numberOfBytesThatWereWritten <= m_size);
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m_next += numberOfBytesNotIncludingTerminatorThatWereWritten;
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ASSERT_WITH_SECURITY_IMPLICATION(m_next < m_size);
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ASSERT(!m_buffer[m_next]);
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}
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CString StringPrintStream::toCString()
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{
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ASSERT(m_next == strlen(m_buffer));
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return CString(m_buffer, m_next);
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}
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void StringPrintStream::reset()
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{
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m_next = 0;
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m_buffer[0] = 0;
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}
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Expected<String, UTF8ConversionError> StringPrintStream::tryToString()
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{
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ASSERT(m_next == strlen(m_buffer));
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if (m_next > String::MaxLength)
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return makeUnexpected(UTF8ConversionError::OutOfMemory);
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return String::fromUTF8(m_buffer, m_next);
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}
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String StringPrintStream::toString()
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{
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ASSERT(m_next == strlen(m_buffer));
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return String::fromUTF8(m_buffer, m_next);
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}
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String StringPrintStream::toStringWithLatin1Fallback()
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{
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ASSERT(m_next == strlen(m_buffer));
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return String::fromUTF8WithLatin1Fallback(m_buffer, m_next);
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}
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void StringPrintStream::increaseSize(size_t newSize)
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{
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ASSERT_WITH_SECURITY_IMPLICATION(newSize > m_size);
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ASSERT(newSize > sizeof(m_inlineBuffer));
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// Use exponential resizing to reduce thrashing.
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m_size = newSize << 1;
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// Use fastMalloc instead of fastRealloc because we know that for the sizes we're using,
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// fastRealloc will just do malloc+free anyway. Also, this simplifies the code since
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// we can't realloc the inline buffer.
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char* newBuffer = static_cast<char*>(fastMalloc(m_size));
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memcpy(newBuffer, m_buffer, m_next + 1);
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if (m_buffer != m_inlineBuffer)
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fastFree(m_buffer);
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m_buffer = newBuffer;
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}
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} // namespace WTF
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