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35 /*! \libinternal \file
37 * Declares implementations for textstream.h interfaces for file input/output.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
41 * \ingroup module_utility
43 #ifndef GMX_UTILITY_FILESTREAM_H
44 #define GMX_UTILITY_FILESTREAM_H
50 #include "gromacs/utility/classhelpers.h"
51 #include "gromacs/utility/textstream.h"
61 /*! \libinternal \brief
62 * Text input stream implementation for reading from `stdin`.
64 * Implementations for the TextInputStream methods throw FileIOError on any
68 * \ingroup module_utility
70 class StandardInputStream : public TextInputStream
74 * Returns whether `stdin` is an interactive terminal.
76 * Only works on Unix, otherwise always returns true.
80 bool isInteractive() const;
82 // From TextInputStream
83 virtual bool readLine(std::string *line);
84 virtual void close() {}
87 * Returns a stream for accessing `stdin`.
91 static StandardInputStream &instance();
94 /*! \libinternal \brief
95 * Text input stream implementation for reading from a file.
97 * Implementations for the TextInputStream methods throw FileIOError on any
101 * \ingroup module_utility
103 class TextInputFile : public TextInputStream
107 * Opens a file and returns a `FILE` handle.
109 * \param[in] filename Path of the file to open.
110 * \throws FileIOError on any I/O error.
112 * Instead of returning `NULL` on errors, throws an exception with
113 * additional details (including the file name and `errno`).
115 static FILE *openRawHandle(const char *filename);
116 //! \copydoc openRawHandle(const char *, const char *)
117 static FILE *openRawHandle(const std::string &filename);
120 * Opens a text file as a stream.
122 * \param[in] filename Path to the file to open.
123 * \throws std::bad_alloc if out of memory.
124 * \throws FileIOError on any I/O error.
126 explicit TextInputFile(const std::string &filename);
128 * Initializes file object from an existing file handle.
130 * \param[in] fp File handle to use.
131 * \throws std::bad_alloc if out of memory.
133 * The caller is responsible of closing the file; close() does nothing
134 * for an object constructed this way.
136 explicit TextInputFile(FILE *fp);
137 virtual ~TextInputFile();
140 * Returns a raw handle to the input file.
142 * This is provided for interoperability with older C-like code.
146 // From TextInputStream
147 virtual bool readLine(std::string *line);
148 virtual void close();
151 PrivateImplPointer<internal::FileStreamImpl> impl_;
154 /*! \libinternal \brief
155 * Text output stream implementation for writing to a file.
157 * Implementations for the TextOutputStream methods throw FileIOError on any
161 * \ingroup module_utility
163 class TextOutputFile : public TextOutputStream
166 //! \copydoc TextInputFile::TextInputFile(const std::string &)
167 explicit TextOutputFile(const std::string &filename);
168 //! \copydoc TextInputFile::TextInputFile(FILE *)
169 explicit TextOutputFile(FILE *fp);
170 virtual ~TextOutputFile();
172 // From TextOutputStream
173 virtual void write(const char *text);
174 virtual void close();
177 * Returns a stream for accessing `stdout`.
179 * \throws std::bad_alloc if out of memory (only on first call).
181 static TextOutputFile &standardOutput();
183 * Returns a stream for accessing `stderr`.
185 * \throws std::bad_alloc if out of memory (only on first call).
187 static TextOutputFile &standardError();
190 PrivateImplPointer<internal::FileStreamImpl> impl_;