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37 * Implements gmx::File.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_utility
61 #include "gromacs/utility/exceptions.h"
62 #include "gromacs/utility/gmxassert.h"
63 #include "gromacs/utility/stringutil.h"
69 * Private implementation class for File.
71 * \ingroup module_utility
77 * Initialize a file object with the given handle.
79 * \param[in] fp %File handle to use (may be NULL).
80 * \param[in] bClose Whether this object should close its file handle.
82 Impl(FILE *fp, bool bClose);
85 //! File handle for this object (may be NULL).
88 * Whether \p fp_ should be closed by this object.
90 * Can be true if \p fp_ is NULL.
95 File::Impl::Impl(FILE *fp, bool bClose)
96 : fp_(fp), bClose_(bClose)
102 if (fp_ != NULL && bClose_)
104 if (fclose(fp_) != 0)
106 // TODO: Log the error somewhere
111 File::File(const char *filename, const char *mode)
112 : impl_(new Impl(NULL, true))
114 open(filename, mode);
117 File::File(const std::string &filename, const char *mode)
118 : impl_(new Impl(NULL, true))
120 open(filename, mode);
123 File::File(FILE *fp, bool bClose)
124 : impl_(new Impl(fp, bClose))
132 void File::open(const char *filename, const char *mode)
134 GMX_RELEASE_ASSERT(impl_->fp_ == NULL,
135 "Attempted to open the same file object twice");
136 // TODO: Port all necessary functionality from gmx_ffopen() here.
137 impl_->fp_ = fopen(filename, mode);
138 if (impl_->fp_ == NULL)
140 GMX_THROW_WITH_ERRNO(
141 FileIOError(formatString("Could not open file '%s'", filename)),
146 void File::open(const std::string &filename, const char *mode)
148 open(filename.c_str(), mode);
153 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
154 "Attempted to close a file object that is not open");
155 GMX_RELEASE_ASSERT(impl_->bClose_,
156 "Attempted to close a file object that should not be");
157 bool bOk = (fclose(impl_->fp_) == 0);
161 GMX_THROW_WITH_ERRNO(
162 FileIOError("Error while closing file"), "fclose", errno);
166 bool File::isInteractive() const
168 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
169 "Attempted to access a file object that is not open");
171 return isatty(fileno(impl_->fp_));
179 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
180 "Attempted to access a file object that is not open");
184 void File::readBytes(void *buffer, size_t bytes)
188 // TODO: Retry based on errno or something else?
189 size_t bytesRead = std::fread(buffer, 1, bytes, fp);
190 if (bytesRead != bytes)
194 GMX_THROW(FileIOError(
195 formatString("Premature end of file\n"
196 "Attempted to read: %d bytes\n"
197 "Successfully read: %d bytes",
198 static_cast<int>(bytes),
199 static_cast<int>(bytesRead))));
203 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
209 bool File::readLine(std::string *line)
211 if (!readLineWithTrailingSpace(line))
215 size_t endPos = line->find_last_not_of(" \t\r\n");
216 if (endPos != std::string::npos)
218 line->resize(endPos + 1);
223 bool File::readLineWithTrailingSpace(std::string *line)
226 const size_t bufsize = 256;
231 while (fgets(buf, bufsize, fp) != NULL)
233 size_t length = std::strlen(buf);
234 result.append(buf, length);
235 if (length < bufsize - 1 || buf[length - 1] == '\n')
242 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
246 return !result.empty() || !feof(fp);
249 void File::writeString(const char *str)
251 if (fprintf(handle(), "%s", str) < 0)
253 GMX_THROW_WITH_ERRNO(FileIOError("Writing to file failed"),
258 void File::writeLine(const char *line)
260 size_t length = std::strlen(line);
263 if (length == 0 || line[length-1] != '\n')
269 void File::writeLine()
275 bool File::exists(const char *filename)
277 if (filename == NULL)
281 FILE *test = fopen(filename, "r");
289 // Windows doesn't allow fopen of directory, so we don't need to check
291 #ifndef GMX_NATIVE_WINDOWS
293 int status = stat(filename, &st_buf);
294 if (status != 0 || !S_ISREG(st_buf.st_mode))
304 bool File::exists(const std::string &filename)
306 return exists(filename.c_str());
310 File &File::standardInput()
312 static File stdinObject(stdin, false);
317 File &File::standardOutput()
319 static File stdoutObject(stdout, false);
324 File &File::standardError()
326 static File stderrObject(stderr, false);
331 std::string File::readToString(const char *filename)
333 // Binary mode is required on Windows to be able to determine a size
334 // that can be passed to fread().
335 File file(filename, "rb");
336 FILE *fp = file.handle();
338 if (std::fseek(fp, 0L, SEEK_END) != 0)
340 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to end of file failed"),
343 long len = std::ftell(fp);
346 GMX_THROW_WITH_ERRNO(FileIOError("Reading file length failed"),
349 if (std::fseek(fp, 0L, SEEK_SET) != 0)
351 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to start of file failed"),
355 std::vector<char> data(len);
356 file.readBytes(&data[0], len);
359 std::string result(&data[0], len);
360 // The below is necessary on Windows to make newlines stay as '\n' on a
362 result = replaceAll(result, "\r\n", "\n");
368 std::string File::readToString(const std::string &filename)
370 return readToString(filename.c_str());
374 void File::writeFileFromString(const std::string &filename,
375 const std::string &text)
377 File file(filename, "w");
378 file.writeString(text);