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37 * Implements classes from filestream.h.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_utility
44 #include "filestream.h"
55 #include "gromacs/utility/exceptions.h"
56 #include "gromacs/utility/gmxassert.h"
57 #include "gromacs/utility/stringutil.h"
65 //! Helper function for implementing readLine() for input streams.
66 bool readLineImpl(FILE *fp, std::string *line)
69 const size_t bufsize = 256;
73 while (std::fgets(buf, bufsize, fp) != NULL)
75 const size_t length = std::strlen(buf);
76 result.append(buf, length);
77 if (length < bufsize - 1 || buf[length - 1] == '\n')
84 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
88 return !result.empty() || !std::feof(fp);
96 /********************************************************************
103 explicit FileStreamImpl(FILE *fp)
104 : fp_(fp), bClose_(false)
107 FileStreamImpl(const char *filename, const char *mode)
108 : fp_(NULL), bClose_(true)
110 fp_ = std::fopen(filename, mode);
113 GMX_THROW_WITH_ERRNO(
114 FileIOError(formatString("Could not open file '%s'", filename)),
120 if (fp_ != NULL && bClose_)
122 if (std::fclose(fp_) != 0)
124 // TODO: Log the error somewhere
131 GMX_RELEASE_ASSERT(fp_ != NULL,
132 "Attempted to access a file object that is not open");
138 GMX_RELEASE_ASSERT(fp_ != NULL,
139 "Attempted to close a file object that is not open");
140 GMX_RELEASE_ASSERT(bClose_,
141 "Attempted to close a file object that should not be");
142 const bool bOk = (std::fclose(fp_) == 0);
146 GMX_THROW_WITH_ERRNO(
147 FileIOError("Error while closing file"), "fclose", errno);
152 //! File handle for this object (NULL if the stream has been closed).
154 //! Whether \p fp_ should be closed by this object.
158 } // namespace internal
160 using internal::FileStreamImpl;
162 /********************************************************************
163 * StandardInputStream
166 bool StandardInputStream::isInteractive() const
169 return isatty(fileno(stdin));
175 bool StandardInputStream::readLine(std::string *line)
177 return readLineImpl(stdin, line);
181 StandardInputStream &StandardInputStream::instance()
183 static StandardInputStream stdinObject;
187 /********************************************************************
191 TextInputFile::TextInputFile(const std::string &filename)
192 : impl_(new FileStreamImpl(filename.c_str(), "r"))
196 TextInputFile::TextInputFile(FILE *fp)
197 : impl_(new FileStreamImpl(fp))
201 TextInputFile::~TextInputFile()
205 FILE *TextInputFile::handle()
207 return impl_->handle();
210 bool TextInputFile::readLine(std::string *line)
212 return readLineImpl(impl_->handle(), line);
215 void TextInputFile::close()
220 /********************************************************************
224 TextOutputFile::TextOutputFile(const std::string &filename)
225 : impl_(new FileStreamImpl(filename.c_str(), "w"))
229 TextOutputFile::TextOutputFile(FILE *fp)
230 : impl_(new FileStreamImpl(fp))
234 TextOutputFile::~TextOutputFile()
238 void TextOutputFile::write(const char *str)
240 if (std::fprintf(impl_->handle(), "%s", str) < 0)
242 GMX_THROW_WITH_ERRNO(FileIOError("Writing to file failed"),
247 void TextOutputFile::close()
253 TextOutputFile &TextOutputFile::standardOutput()
255 static TextOutputFile stdoutObject(stdout);
260 TextOutputFile &TextOutputFile::standardError()
262 static TextOutputFile stderrObject(stderr);