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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
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 a file handle for interfacing with C functions.
112 * The file must be open.
118 * Reads given number of bytes from the file.
120 * \param[out] buffer Pointer to buffer that receives the bytes.
121 * \param[in] bytes Number of bytes to read.
122 * \throws FileIOError on any I/O error.
124 * The file must be open.
126 void readBytes(void *buffer, size_t bytes);
128 * Reads a single line from the file.
130 * \param[out] line String to receive the line.
131 * \returns false if nothing was read because the file ended.
132 * \throws std::bad_alloc if out of memory.
133 * \throws FileIOError on any I/O error.
135 * On error or when false is returned, \p line will be empty.
136 * Trailing space will be removed from the line.
137 * To loop over all lines in the file, use:
140 while (file.readLine(&line))
146 bool readLine(std::string *line);
148 * Reads a single line from the file.
150 * \param[out] line String to receive the line.
151 * \returns false if nothing was read because the file ended.
152 * \throws std::bad_alloc if out of memory.
153 * \throws FileIOError on any I/O error.
155 * On error or when false is returned, \p line will be empty.
156 * Works as readLine(), except that terminating newline will be present
157 * in \p line if it was present in the file.
161 bool readLineWithTrailingSpace(std::string *line);
164 * Writes a string to the file.
166 * \param[in] str String to write.
167 * \throws FileIOError on any I/O error.
169 * The file must be open.
171 void writeString(const char *str);
172 //! \copydoc writeString(const char *)
173 void writeString(const std::string &str) { writeString(str.c_str()); }
175 * Writes a line to the file.
177 * \param[in] line Line to write.
178 * \throws FileIOError on any I/O error.
180 * If \p line does not end in a newline, one newline is appended.
181 * Otherwise, works as writeString().
183 * The file must be open.
185 void writeLine(const char *line);
186 //! \copydoc writeLine(const char *)
187 void writeLine(const std::string &line) { writeLine(line.c_str()); }
189 * Writes a newline to the file.
191 * \throws FileIOError on any I/O error.
196 * Checks whether a file exists and is a regular file.
198 * \param[in] filename Path to the file to check.
199 * \returns true if \p filename exists and is accessible.
203 static bool exists(const char *filename);
204 //! \copydoc exists(const char *)
205 static bool exists(const std::string &filename);
208 * Returns a File object for accessing stdin.
210 * \throws std::bad_alloc if out of memory (only on first call).
212 static File &standardInput();
214 * Returns a File object for accessing stdout.
216 * \throws std::bad_alloc if out of memory (only on first call).
218 static File &standardOutput();
220 * Returns a File object for accessing stderr.
222 * \throws std::bad_alloc if out of memory (only on first call).
224 static File &standardError();
227 * Reads contents of a file to a std::string.
229 * \param[in] filename Name of the file to read.
230 * \returns The contents of \p filename.
231 * \throws std::bad_alloc if out of memory.
232 * \throws FileIOError on any I/O error.
234 static std::string readToString(const char *filename);
235 //! \copydoc readToString(const char *)
236 static std::string readToString(const std::string &filename);
238 * Convenience method for writing a file from a string in a single call.
240 * \param[in] filename Name of the file to read.
241 * \param[in] text String to write to \p filename.
242 * \throws FileIOError on any I/O error.
244 * If \p filename exists, it is overwritten.
246 static void writeFileFromString(const std::string &filename,
247 const std::string &text);
251 * Initialize file object from an existing file handle.
253 * \param[in] fp %File handle to use (may be NULL).
254 * \param[in] bClose Whether this object should close its file handle.
255 * \throws std::bad_alloc if out of memory.
257 * Used internally to implement standardOutput() and standardError().
259 File(FILE *fp, bool bClose);
263 PrivateImplPointer<Impl> impl_;