1 /*

     2  * Copyright (C) 2003, 2006, 2008, 2009 Apple Inc. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    24  */

    25 

    26 

    27 #include "config.h"

    28 #include "CString.h"

    29 

    30 using std::min;

    31 

    32 namespace WTF {

    33 

    34 CString::CString(const char* str)

    35 {

    36     init(str, strlen(str));

    37 }

    38 

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

    40 {

    41     init(str, length);

    42 }

    43 

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

    45 {

    46     if (!str)

    47         return;

    48     

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

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

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

    52 }

    53 

    54 char* CString::mutableData()

    55 {

    56     copyBufferIfNeeded();

    57     if (!m_buffer)

    58         return 0;

    59     return m_buffer->mutableData();

    60 }

    61     

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

    63 {

    64     CString result;

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

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

    67     bytes[length] = '\0';

    68     characterBuffer = bytes;

    69     return result;

    70 }

    71 

    72 void CString::copyBufferIfNeeded()

    73 {

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

    75         return;

    76         

    77     int len = m_buffer->length();

    78     RefPtr<CStringBuffer> m_temp = m_buffer;

    79     m_buffer = CStringBuffer::create(len);

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

    81 }

    82 

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

    84 {

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

    86         return false;

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

    88         return false;

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

    90 }

    91 

    92 } // namespace WTF