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37 * Implements gmx::File.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_utility
62 #include "gromacs/utility/exceptions.h"
63 #include "gromacs/utility/gmxassert.h"
64 #include "gromacs/utility/stringutil.h"
70 * Private implementation class for File.
72 * \ingroup module_utility
78 * Initialize a file object with the given handle.
80 * \param[in] fp %File handle to use (may be NULL).
81 * \param[in] bClose Whether this object should close its file handle.
83 Impl(FILE *fp, bool bClose);
86 //! File handle for this object (may be NULL).
89 * Whether \p fp_ should be closed by this object.
91 * Can be true if \p fp_ is NULL.
96 File::Impl::Impl(FILE *fp, bool bClose)
97 : fp_(fp), bClose_(bClose)
103 if (fp_ != NULL && bClose_)
105 if (fclose(fp_) != 0)
107 // TODO: Log the error somewhere
112 File::File(const char *filename, const char *mode)
113 : impl_(new Impl(NULL, true))
115 open(filename, mode);
118 File::File(const std::string &filename, const char *mode)
119 : impl_(new Impl(NULL, true))
121 open(filename, mode);
124 File::File(FILE *fp, bool bClose)
125 : impl_(new Impl(fp, bClose))
133 void File::open(const char *filename, const char *mode)
135 GMX_RELEASE_ASSERT(impl_->fp_ == NULL,
136 "Attempted to open the same file object twice");
137 // TODO: Port all necessary functionality from gmx_ffopen() here.
138 impl_->fp_ = fopen(filename, mode);
139 if (impl_->fp_ == NULL)
141 GMX_THROW_WITH_ERRNO(
142 FileIOError(formatString("Could not open file '%s'", filename)),
147 void File::open(const std::string &filename, const char *mode)
149 open(filename.c_str(), mode);
154 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
155 "Attempted to close a file object that is not open");
156 GMX_RELEASE_ASSERT(impl_->bClose_,
157 "Attempted to close a file object that should not be");
158 bool bOk = (fclose(impl_->fp_) == 0);
162 GMX_THROW_WITH_ERRNO(
163 FileIOError("Error while closing file"), "fclose", errno);
167 bool File::isInteractive() const
169 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
170 "Attempted to access a file object that is not open");
172 return isatty(fileno(impl_->fp_));
180 GMX_RELEASE_ASSERT(impl_->fp_ != NULL,
181 "Attempted to access a file object that is not open");
185 void File::readBytes(void *buffer, size_t bytes)
189 // TODO: Retry based on errno or something else?
190 size_t bytesRead = std::fread(buffer, 1, bytes, fp);
191 if (bytesRead != bytes)
195 GMX_THROW(FileIOError(
196 formatString("Premature end of file\n"
197 "Attempted to read: %d bytes\n"
198 "Successfully read: %d bytes",
199 static_cast<int>(bytes),
200 static_cast<int>(bytesRead))));
204 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
210 bool File::readLine(std::string *line)
212 if (!readLineWithTrailingSpace(line))
216 size_t endPos = line->find_last_not_of(" \t\r\n");
217 if (endPos != std::string::npos)
219 line->resize(endPos + 1);
224 bool File::readLineWithTrailingSpace(std::string *line)
227 const size_t bufsize = 256;
232 while (fgets(buf, bufsize, fp) != NULL)
234 size_t length = std::strlen(buf);
235 result.append(buf, length);
236 if (length < bufsize - 1 || buf[length - 1] == '\n')
243 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
247 return !result.empty() || !feof(fp);
250 void File::writeString(const char *str)
252 if (fprintf(handle(), "%s", str) < 0)
254 GMX_THROW_WITH_ERRNO(FileIOError("Writing to file failed"),
259 void File::writeLine(const char *line)
261 size_t length = std::strlen(line);
264 if (length == 0 || line[length-1] != '\n')
270 void File::writeLine()
276 bool File::exists(const char *filename)
278 if (filename == NULL)
282 FILE *test = fopen(filename, "r");
290 // Windows doesn't allow fopen of directory, so we don't need to check
292 #ifndef GMX_NATIVE_WINDOWS
294 int status = stat(filename, &st_buf);
295 if (status != 0 || !S_ISREG(st_buf.st_mode))
305 bool File::exists(const std::string &filename)
307 return exists(filename.c_str());
311 File &File::standardInput()
313 static File stdinObject(stdin, false);
318 File &File::standardOutput()
320 static File stdoutObject(stdout, false);
325 File &File::standardError()
327 static File stderrObject(stderr, false);
332 std::string File::readToString(const char *filename)
334 // Binary mode is required on Windows to be able to determine a size
335 // that can be passed to fread().
336 File file(filename, "rb");
337 FILE *fp = file.handle();
339 if (std::fseek(fp, 0L, SEEK_END) != 0)
341 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to end of file failed"),
344 long len = std::ftell(fp);
347 GMX_THROW_WITH_ERRNO(FileIOError("Reading file length failed"),
350 if (std::fseek(fp, 0L, SEEK_SET) != 0)
352 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to start of file failed"),
356 std::vector<char> data(len);
357 file.readBytes(&data[0], len);
360 std::string result(&data[0], len);
361 // The below is necessary on Windows to make newlines stay as '\n' on a
363 result = replaceAll(result, "\r\n", "\n");
369 std::string File::readToString(const std::string &filename)
371 return readToString(filename.c_str());
375 void File::writeFileFromString(const std::string &filename,
376 const std::string &text)
378 File file(filename, "w");
379 file.writeString(text);