/*

 * Copyright (C) 2003, 2006, 2008, 2009 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 COMPUTER, 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 COMPUTER, 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 "CString.h"

using std::min;

namespace WTF {

CString::CString(const char* str)

{

    init(str, strlen(str));

}

CString::CString(const char* str, unsigned length)

{

    init(str, length);

}

void CString::init(const char* str, unsigned length)

{

    if (!str)

        return;

    m_buffer = CStringBuffer::create(length + 1);

    memcpy(m_buffer->mutableData(), str, length); 

    m_buffer->mutableData()[length] = '\0';

}

char* CString::mutableData()

{

    copyBufferIfNeeded();

    if (!m_buffer)

        return 0;

    return m_buffer->mutableData();

}

CString CString::newUninitialized(size_t length, char*& characterBuffer)

{

    CString result;

    result.m_buffer = CStringBuffer::create(length + 1);

    char* bytes = result.m_buffer->mutableData();

    bytes[length] = '\0';

    characterBuffer = bytes;

    return result;

}

void CString::copyBufferIfNeeded()

{

    if (!m_buffer || m_buffer->hasOneRef())

        return;

    int len = m_buffer->length();

    RefPtr<CStringBuffer> m_temp = m_buffer;

    m_buffer = CStringBuffer::create(len);

    memcpy(m_buffer->mutableData(), m_temp->data(), len);

}

bool operator==(const CString& a, const CString& b)

{

    if (a.isNull() != b.isNull())

        return false;

    if (a.length() != b.length())

        return false;

    return !strncmp(a.data(), b.data(), min(a.length(), b.length()));

}

} // namespace WTF