| /* |
| * Copyright (C) 2003, 2006, 2008, 2009, 2010 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 namespace std; |
| |
| namespace WTF { |
| |
| CString::CString(const char* str) |
| { |
| if (!str) |
| return; |
| |
| init(str, strlen(str)); |
| } |
| |
| CString::CString(const char* str, size_t length) |
| { |
| init(str, length); |
| } |
| |
| void CString::init(const char* str, size_t length) |
| { |
| if (!str) |
| return; |
| |
| // We need to be sure we can add 1 to length without overflowing. |
| // Since the passed-in length is the length of an actual existing |
| // string, and we know the string doesn't occupy the entire address |
| // space, we can assert here and there's no need for a runtime check. |
| ASSERT(length < numeric_limits<size_t>::max()); |
| |
| 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) |
| { |
| if (length >= numeric_limits<size_t>::max()) |
| CRASH(); |
| |
| 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; |
| |
| RefPtr<CStringBuffer> buffer = m_buffer.release(); |
| size_t length = buffer->length(); |
| m_buffer = CStringBuffer::create(length); |
| memcpy(m_buffer->mutableData(), buffer->data(), length); |
| } |
| |
| 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 |