wtf/text/CString.cpp

   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
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  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