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39 * \author Teemu Murtola <teemu.murtola@gmail.com>
41 * \ingroup module_utility
43 #ifndef GMX_UTILITY_FILE_H
44 #define GMX_UTILITY_FILE_H
50 #include "gromacs/utility/common.h"
58 * This class provides basic file I/O functionality and uses exceptions
59 * (FileIOError) for error reporting.
62 * \ingroup module_utility
68 * Creates a file object and opens a file.
70 * \param[in] filename Path of the file to open.
71 * \param[in] mode Mode to open the file in (for fopen()).
72 * \throws std::bad_alloc if out of memory.
73 * \throws FileIOError on any I/O error.
75 * \see open(const char *, const char *)
77 File(const char *filename, const char *mode);
78 //! \copydoc File(const char *, const char *)
79 File(const std::string &filename, const char *mode);
81 * Destroys the file object.
83 * If the file is still open, it is closed.
84 * Any error conditions will be ignored.
91 * \param[in] filename Path of the file to open.
92 * \param[in] mode Mode to open the file in (for fopen()).
93 * \throws FileIOError on any I/O error.
95 * The file object must not be open.
97 void open(const char *filename, const char *mode);
98 //! \copydoc open(const char *, const char *)
99 void open(const std::string &filename, const char *mode);
101 * Closes the file object.
103 * \throws FileIOError on any I/O error.
105 * The file must be open.
110 * Returns whether the file is an interactive terminal.
112 * Only works on Unix, otherwise always returns true.
113 * It only makes sense to call this for File::standardInput() and
116 * Thie file must be open.
119 bool isInteractive() const;
121 * Returns a file handle for interfacing with C functions.
123 * The file must be open.
129 * Reads given number of bytes from the file.
131 * \param[out] buffer Pointer to buffer that receives the bytes.
132 * \param[in] bytes Number of bytes to read.
133 * \throws FileIOError on any I/O error.
135 * The file must be open.
137 void readBytes(void *buffer, size_t bytes);
139 * Reads a single line from the file.
141 * \param[out] line String to receive the line.
142 * \returns false if nothing was read because the file ended.
143 * \throws std::bad_alloc if out of memory.
144 * \throws FileIOError on any I/O error.
146 * On error or when false is returned, \p line will be empty.
147 * Trailing space will be removed from the line.
148 * To loop over all lines in the file, use:
151 while (file.readLine(&line))
157 bool readLine(std::string *line);
159 * Reads a single line from the file.
161 * \param[out] line String to receive the line.
162 * \returns false if nothing was read because the file ended.
163 * \throws std::bad_alloc if out of memory.
164 * \throws FileIOError on any I/O error.
166 * On error or when false is returned, \p line will be empty.
167 * Works as readLine(), except that terminating newline will be present
168 * in \p line if it was present in the file.
172 bool readLineWithTrailingSpace(std::string *line);
175 * Writes a string to the file.
177 * \param[in] str String to write.
178 * \throws FileIOError on any I/O error.
180 * The file must be open.
182 void writeString(const char *str);
183 //! \copydoc writeString(const char *)
184 void writeString(const std::string &str) { writeString(str.c_str()); }
186 * Writes a line to the file.
188 * \param[in] line Line to write.
189 * \throws FileIOError on any I/O error.
191 * If \p line does not end in a newline, one newline is appended.
192 * Otherwise, works as writeString().
194 * The file must be open.
196 void writeLine(const char *line);
197 //! \copydoc writeLine(const char *)
198 void writeLine(const std::string &line) { writeLine(line.c_str()); }
200 * Writes a newline to the file.
202 * \throws FileIOError on any I/O error.
207 * Checks whether a file exists and is a regular file.
209 * \param[in] filename Path to the file to check.
210 * \returns true if \p filename exists and is accessible.
214 static bool exists(const char *filename);
215 //! \copydoc exists(const char *)
216 static bool exists(const std::string &filename);
219 * Returns a File object for accessing stdin.
221 * \throws std::bad_alloc if out of memory (only on first call).
223 static File &standardInput();
225 * Returns a File object for accessing stdout.
227 * \throws std::bad_alloc if out of memory (only on first call).
229 static File &standardOutput();
231 * Returns a File object for accessing stderr.
233 * \throws std::bad_alloc if out of memory (only on first call).
235 static File &standardError();
238 * Reads contents of a file to a std::string.
240 * \param[in] filename Name of the file to read.
241 * \returns The contents of \p filename.
242 * \throws std::bad_alloc if out of memory.
243 * \throws FileIOError on any I/O error.
245 static std::string readToString(const char *filename);
246 //! \copydoc readToString(const char *)
247 static std::string readToString(const std::string &filename);
249 * Convenience method for writing a file from a string in a single call.
251 * \param[in] filename Name of the file to read.
252 * \param[in] text String to write to \p filename.
253 * \throws FileIOError on any I/O error.
255 * If \p filename exists, it is overwritten.
257 static void writeFileFromString(const std::string &filename,
258 const std::string &text);
262 * Initialize file object from an existing file handle.
264 * \param[in] fp %File handle to use (may be NULL).
265 * \param[in] bClose Whether this object should close its file handle.
266 * \throws std::bad_alloc if out of memory.
268 * Used internally to implement standardOutput() and standardError().
270 File(FILE *fp, bool bClose);
274 PrivateImplPointer<Impl> impl_;