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37 * Implements gmx::File.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_utility
58 #include "gromacs/utility/exceptions.h"
59 #include "gromacs/utility/gmxassert.h"
60 #include "gromacs/utility/stringutil.h"
66 * Private implementation class for File.
68 * \ingroup module_utility
74 * Initialize a file object with the given handle.
76 * \param[in] fp %File handle to use (may be NULL).
77 * \param[in] bClose Whether this object should close its file handle.
79 Impl(FILE *fp, bool bClose);
82 //! File handle for this object (may be NULL).
85 * Whether \p fp_ should be closed by this object.
87 * Can be true if \p fp_ is NULL.
92 File::Impl::Impl(FILE *fp, bool bClose)
93 : fp_(fp), bClose_(bClose)
99 if (fp_ != NULL && bClose_)
101 if (fclose(fp_) != 0)
103 // TODO: Log the error somewhere
109 FILE *File::openRawHandle(const char *filename, const char *mode)
111 FILE *fp = fopen(filename, mode);
114 GMX_THROW_WITH_ERRNO(
115 FileIOError(formatString("Could not open file '%s'", filename)),
122 FILE *File::openRawHandle(const std::string &filename, const char *mode)
124 return openRawHandle(filename.c_str(), mode);
127 File::File(const char *filename, const char *mode)
128 : impl_(new Impl(NULL, true))
130 open(filename, mode);
133 File::File(const std::string &filename, const char *mode)
134 : impl_(new Impl(NULL, true))
136 open(filename, mode);
143 void File::open(const char *filename, const char *mode)
145 GMX_RELEASE_ASSERT(impl_->fp_ == NULL,
146 "Attempted to open the same file object twice");
147 // TODO: Port all necessary functionality from gmx_ffopen() here.
148 impl_->fp_ = openRawHandle(filename, mode);
151 void File::open(const std::string &filename, const char *mode)
153 open(filename.c_str(), mode);
158 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
159 "Attempted to close a file object that is not open");
160 GMX_RELEASE_ASSERT(impl_->bClose_,
161 "Attempted to close a file object that should not be");
162 bool bOk = (fclose(impl_->fp_) == 0);
166 GMX_THROW_WITH_ERRNO(
167 FileIOError("Error while closing file"), "fclose", errno);
173 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
174 "Attempted to access a file object that is not open");
178 void File::readBytes(void *buffer, size_t bytes)
182 // TODO: Retry based on errno or something else?
183 size_t bytesRead = std::fread(buffer, 1, bytes, fp);
184 if (bytesRead != bytes)
188 GMX_THROW(FileIOError(
189 formatString("Premature end of file\n"
190 "Attempted to read: %d bytes\n"
191 "Successfully read: %d bytes",
192 static_cast<int>(bytes),
193 static_cast<int>(bytesRead))));
197 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
203 void File::writeString(const char *str)
205 if (fprintf(handle(), "%s", str) < 0)
207 GMX_THROW_WITH_ERRNO(FileIOError("Writing to file failed"),
213 bool File::exists(const char *filename)
215 if (filename == NULL)
219 FILE *test = fopen(filename, "r");
227 // Windows doesn't allow fopen of directory, so we don't need to check
229 #ifndef GMX_NATIVE_WINDOWS
231 int status = stat(filename, &st_buf);
232 if (status != 0 || !S_ISREG(st_buf.st_mode))
242 bool File::exists(const std::string &filename)
244 return exists(filename.c_str());
248 std::string File::readToString(const char *filename)
250 // Binary mode is required on Windows to be able to determine a size
251 // that can be passed to fread().
252 File file(filename, "rb");
253 FILE *fp = file.handle();
255 if (std::fseek(fp, 0L, SEEK_END) != 0)
257 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to end of file failed"),
260 long len = std::ftell(fp);
263 GMX_THROW_WITH_ERRNO(FileIOError("Reading file length failed"),
266 if (std::fseek(fp, 0L, SEEK_SET) != 0)
268 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to start of file failed"),
272 std::vector<char> data(len);
273 file.readBytes(&data[0], len);
276 std::string result(&data[0], len);
277 // The below is necessary on Windows to make newlines stay as '\n' on a
279 result = replaceAll(result, "\r\n", "\n");
285 std::string File::readToString(const std::string &filename)
287 return readToString(filename.c_str());
291 void File::writeFileFromString(const std::string &filename,
292 const std::string &text)
294 File file(filename, "w");
295 file.writeString(text);