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37 * Implements gmx::File.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_utility
59 #include "gromacs/utility/exceptions.h"
60 #include "gromacs/utility/gmxassert.h"
61 #include "gromacs/utility/stringutil.h"
67 * Private implementation class for File.
69 * \ingroup module_utility
75 * Initialize a file object with the given handle.
77 * \param[in] fp %File handle to use (may be NULL).
78 * \param[in] bClose Whether this object should close its file handle.
80 Impl(FILE *fp, bool bClose);
83 //! File handle for this object (may be NULL).
86 * Whether \p fp_ should be closed by this object.
88 * Can be true if \p fp_ is NULL.
93 File::Impl::Impl(FILE *fp, bool bClose)
94 : fp_(fp), bClose_(bClose)
100 if (fp_ != NULL && bClose_)
102 if (fclose(fp_) != 0)
104 // TODO: Log the error somewhere
109 File::File(const char *filename, const char *mode)
110 : impl_(new Impl(NULL, true))
112 open(filename, mode);
115 File::File(const std::string &filename, const char *mode)
116 : impl_(new Impl(NULL, true))
118 open(filename, mode);
121 File::File(FILE *fp, bool bClose)
122 : impl_(new Impl(fp, bClose))
130 void File::open(const char *filename, const char *mode)
132 GMX_RELEASE_ASSERT(impl_->fp_ == NULL,
133 "Attempted to open the same file object twice");
134 // TODO: Port all necessary functionality from gmx_ffopen() here.
135 impl_->fp_ = fopen(filename, mode);
136 if (impl_->fp_ == NULL)
138 GMX_THROW_WITH_ERRNO(
139 FileIOError(formatString("Could not open file '%s'", filename)),
144 void File::open(const std::string &filename, const char *mode)
146 open(filename.c_str(), mode);
151 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
152 "Attempted to close a file object that is not open");
153 GMX_RELEASE_ASSERT(impl_->bClose_,
154 "Attempted to close a file object that should not be");
155 bool bOk = (fclose(impl_->fp_) == 0);
159 GMX_THROW_WITH_ERRNO(
160 FileIOError("Error while closing file"), "fclose", errno);
164 bool File::isInteractive() const
166 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
167 "Attempted to access a file object that is not open");
169 return isatty(fileno(impl_->fp_));
177 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
178 "Attempted to access a file object that is not open");
182 void File::readBytes(void *buffer, size_t bytes)
186 // TODO: Retry based on errno or something else?
187 size_t bytesRead = std::fread(buffer, 1, bytes, fp);
188 if (bytesRead != bytes)
192 GMX_THROW(FileIOError(
193 formatString("Premature end of file\n"
194 "Attempted to read: %d bytes\n"
195 "Successfully read: %d bytes",
196 static_cast<int>(bytes),
197 static_cast<int>(bytesRead))));
201 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
207 bool File::readLine(std::string *line)
209 if (!readLineWithTrailingSpace(line))
213 size_t endPos = line->find_last_not_of(" \t\r\n");
214 if (endPos != std::string::npos)
216 line->resize(endPos + 1);
221 bool File::readLineWithTrailingSpace(std::string *line)
224 const size_t bufsize = 256;
229 while (fgets(buf, bufsize, fp) != NULL)
231 size_t length = std::strlen(buf);
232 result.append(buf, length);
233 if (length < bufsize - 1 || buf[length - 1] == '\n')
240 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
244 return !result.empty() || !feof(fp);
247 void File::writeString(const char *str)
249 if (fprintf(handle(), "%s", str) < 0)
251 GMX_THROW_WITH_ERRNO(FileIOError("Writing to file failed"),
256 void File::writeLine(const char *line)
258 size_t length = std::strlen(line);
261 if (length == 0 || line[length-1] != '\n')
267 void File::writeLine()
273 bool File::exists(const char *filename)
275 if (filename == NULL)
279 FILE *test = fopen(filename, "r");
287 // Windows doesn't allow fopen of directory, so we don't need to check
289 #ifndef GMX_NATIVE_WINDOWS
291 int status = stat(filename, &st_buf);
292 if (status != 0 || !S_ISREG(st_buf.st_mode))
302 bool File::exists(const std::string &filename)
304 return exists(filename.c_str());
308 File &File::standardInput()
310 static File stdinObject(stdin, false);
315 File &File::standardOutput()
317 static File stdoutObject(stdout, false);
322 File &File::standardError()
324 static File stderrObject(stderr, false);
329 std::string File::readToString(const char *filename)
331 // Binary mode is required on Windows to be able to determine a size
332 // that can be passed to fread().
333 File file(filename, "rb");
334 FILE *fp = file.handle();
336 if (std::fseek(fp, 0L, SEEK_END) != 0)
338 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to end of file failed"),
341 long len = std::ftell(fp);
344 GMX_THROW_WITH_ERRNO(FileIOError("Reading file length failed"),
347 if (std::fseek(fp, 0L, SEEK_SET) != 0)
349 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to start of file failed"),
353 std::vector<char> data(len);
354 file.readBytes(&data[0], len);
357 std::string result(&data[0], len);
358 // The below is necessary on Windows to make newlines stay as '\n' on a
360 result = replaceAll(result, "\r\n", "\n");
366 std::string File::readToString(const std::string &filename)
368 return readToString(filename.c_str());
372 void File::writeFileFromString(const std::string &filename,
373 const std::string &text)
375 File file(filename, "w");
376 file.writeString(text);