1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qbs.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "filesaver.h"
#include "stlutils.h"
#include <tools/iosutils.h>
#include <cerrno>
#include <fstream>
namespace qbs {
namespace Internal {
FileSaver::FileSaver(std::string filePath, bool overwriteIfUnchanged)
: m_filePath(std::move(filePath)), m_overwriteIfUnchanged(overwriteIfUnchanged)
{
}
std::ostream *FileSaver::device()
{
return m_memoryDevice.get();
}
bool FileSaver::open()
{
if (!m_overwriteIfUnchanged) {
std::ifstream file(utf8_to_native_path(m_filePath));
if (file.is_open())
m_oldFileContents.assign(std::istreambuf_iterator<std::ifstream::char_type>(file),
std::istreambuf_iterator<std::ifstream::char_type>());
else
m_oldFileContents.clear();
}
m_memoryDevice = std::make_shared<std::stringstream>();
return true;
}
bool FileSaver::commit()
{
if (!device())
return false;
device()->flush();
if (!device()->good())
return false;
const std::string newFileContents = m_memoryDevice->str();
if (!m_overwriteIfUnchanged && m_oldFileContents == newFileContents)
return true; // no need to write unchanged data
const std::string tempFilePath = m_filePath + "~";
std::ofstream tempFile(utf8_to_native_path(tempFilePath));
if (!tempFile.is_open())
return false;
tempFile.write(newFileContents.data(), newFileContents.size());
tempFile.close();
if (!tempFile.good())
return false;
if (Internal::rename(tempFilePath, m_filePath) != 0) {
if (errno != EEXIST)
return false;
if (Internal::unlink(m_filePath) != 0)
return false;
return Internal::rename(tempFilePath, m_filePath) == 0;
}
return true;
}
bool FileSaver::write(const std::vector<char> &data)
{
return fwrite(data, device());
}
bool FileSaver::write(const std::string &data)
{
return fwrite(data, device());
}
} // namespace Internal
} // namespace qbs
|
