1 /*
2 * Copyright (C) 2003, 2006, 2008, 2009, 2010 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 namespace std;
31
32 namespace WTF {
33
CString(const char * str)34 CString::CString(const char* str)
35 {
36 if (!str)
37 return;
38
39 init(str, strlen(str));
40 }
41
CString(const char * str,size_t length)42 CString::CString(const char* str, size_t length)
43 {
44 init(str, length);
45 }
46
init(const char * str,size_t length)47 void CString::init(const char* str, size_t length)
48 {
49 if (!str)
50 return;
51
52 // We need to be sure we can add 1 to length without overflowing.
53 // Since the passed-in length is the length of an actual existing
54 // string, and we know the string doesn't occupy the entire address
55 // space, we can assert here and there's no need for a runtime check.
56 ASSERT(length < numeric_limits<size_t>::max());
57
58 m_buffer = CStringBuffer::create(length + 1);
59 memcpy(m_buffer->mutableData(), str, length);
60 m_buffer->mutableData()[length] = '\0';
61 }
62
mutableData()63 char* CString::mutableData()
64 {
65 copyBufferIfNeeded();
66 if (!m_buffer)
67 return 0;
68 return m_buffer->mutableData();
69 }
70
newUninitialized(size_t length,char * & characterBuffer)71 CString CString::newUninitialized(size_t length, char*& characterBuffer)
72 {
73 if (length >= numeric_limits<size_t>::max())
74 CRASH();
75
76 CString result;
77 result.m_buffer = CStringBuffer::create(length + 1);
78 char* bytes = result.m_buffer->mutableData();
79 bytes[length] = '\0';
80 characterBuffer = bytes;
81 return result;
82 }
83
copyBufferIfNeeded()84 void CString::copyBufferIfNeeded()
85 {
86 if (!m_buffer || m_buffer->hasOneRef())
87 return;
88
89 RefPtr<CStringBuffer> buffer = m_buffer.release();
90 size_t length = buffer->length();
91 m_buffer = CStringBuffer::create(length);
92 memcpy(m_buffer->mutableData(), buffer->data(), length);
93 }
94
operator ==(const CString & a,const CString & b)95 bool operator==(const CString& a, const CString& b)
96 {
97 if (a.isNull() != b.isNull())
98 return false;
99 if (a.length() != b.length())
100 return false;
101 return !strncmp(a.data(), b.data(), min(a.length(), b.length()));
102 }
103
104 } // namespace WTF
105