blob: 3d94cdcb38a52722b9ec52b0fe0435b3aca2da0d (
plain)
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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmGeneratedFileStream_h
#define cmGeneratedFileStream_h
#include "cmConfigure.h" // IWYU pragma: keep
#include "cm_codecvt.hxx"
#include "cmsys/FStream.hxx"
#include <string>
// This is the first base class of cmGeneratedFileStream. It will be
// created before and destroyed after the ofstream portion and can
// therefore be used to manage the temporary file.
class cmGeneratedFileStreamBase
{
protected:
// This constructor does not prepare the temporary file. The open
// method must be used.
cmGeneratedFileStreamBase();
// This constructor prepares the temporary output file.
cmGeneratedFileStreamBase(std::string const& name);
// The destructor renames the temporary output file to the real name.
~cmGeneratedFileStreamBase();
// Internal methods to handle the temporary file. Open is always
// called before the real stream is opened. Close is always called
// after the real stream is closed and Okay is set to whether the
// real stream was still valid for writing when it was closed.
void Open(std::string const& name);
bool Close();
// Internal file replacement implementation.
int RenameFile(std::string const& oldname, std::string const& newname);
// Internal file compression implementation.
int CompressFile(std::string const& oldname, std::string const& newname);
// The name of the final destination file for the output.
std::string Name;
// The name of the temporary file.
std::string TempName;
// Whether to do a copy-if-different.
bool CopyIfDifferent = false;
// Whether the real file stream was valid when it was closed.
bool Okay = false;
// Whether the destination file is compressed
bool Compress = false;
// Whether the destination file is compressed
bool CompressExtraExtension = true;
};
/** \class cmGeneratedFileStream
* \brief Output stream for generated files.
*
* File generation should be atomic so that if CMake is killed then a
* generated file is either the original version or the complete new
* version. This stream is used to make sure file generation is
* atomic. Optionally the output file is only replaced if its
* contents have changed to prevent the file modification time from
* being updated.
*/
class cmGeneratedFileStream
: private cmGeneratedFileStreamBase
, public cmsys::ofstream
{
public:
using Stream = cmsys::ofstream;
using Encoding = codecvt::Encoding;
/**
* This constructor prepares a default stream. The open method must
* be used before writing to the stream.
*/
cmGeneratedFileStream(Encoding encoding = codecvt::None);
/**
* This constructor takes the name of the file to be generated. It
* automatically generates a name for the temporary file. If the
* file cannot be opened an error message is produced unless the
* second argument is set to true.
*/
cmGeneratedFileStream(std::string const& name, bool quiet = false,
Encoding encoding = codecvt::None);
/**
* The destructor checks the stream status to be sure the temporary
* file was successfully written before allowing the original to be
* replaced.
*/
~cmGeneratedFileStream() override;
cmGeneratedFileStream(cmGeneratedFileStream const&) = delete;
/**
* Open an output file by name. This should be used only with a
* non-open stream. It automatically generates a name for the
* temporary file. If the file cannot be opened an error message is
* produced unless the second argument is set to true.
*/
cmGeneratedFileStream& Open(std::string const& name, bool quiet = false,
bool binaryFlag = false);
/**
* Close the output file. This should be used only with an open
* stream. The temporary file is atomically renamed to the
* destination file if the stream is still valid when this method
* is called.
*/
bool Close();
/**
* Set whether copy-if-different is done.
*/
void SetCopyIfDifferent(bool copy_if_different);
/**
* Set whether compression is done.
*/
void SetCompression(bool compression);
/**
* Set whether compression has extra extension
*/
void SetCompressionExtraExtension(bool ext);
/**
* Set name of the file that will hold the actual output. This method allows
* the output file to be changed during the use of cmGeneratedFileStream.
*/
void SetName(const std::string& fname);
};
#endif
|
