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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) != nullptr)
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"), "fgets", errno);
87 return !result.empty() || (std::feof(fp) == 0);
95 /********************************************************************
102 explicit FileStreamImpl(FILE* fp) : fp_(fp), bClose_(false) {}
103 FileStreamImpl(const char* filename, const char* mode) : fp_(nullptr), bClose_(true)
105 fp_ = std::fopen(filename, mode);
108 GMX_THROW_WITH_ERRNO(
109 FileIOError(formatString("Could not open file '%s'", filename)), "fopen", errno);
114 if (fp_ != nullptr && bClose_)
116 if (std::fclose(fp_) != 0)
118 // TODO: Log the error somewhere
125 GMX_RELEASE_ASSERT(fp_ != nullptr, "Attempted to access a file object that is not open");
131 GMX_RELEASE_ASSERT(fp_ != nullptr, "Attempted to close a file object that is not open");
132 GMX_RELEASE_ASSERT(bClose_, "Attempted to close a file object that should not be");
133 const bool bOk = (std::fclose(fp_) == 0);
137 GMX_THROW_WITH_ERRNO(FileIOError("Error while closing file"), "fclose", errno);
142 //! File handle for this object (NULL if the stream has been closed).
144 //! Whether \p fp_ should be closed by this object.
148 } // namespace internal
150 using internal::FileStreamImpl;
152 /********************************************************************
153 * StandardInputStream
157 bool StandardInputStream::isInteractive()
160 return isatty(fileno(stdin)) != 0;
166 bool StandardInputStream::readLine(std::string* line)
168 return readLineImpl(stdin, line);
171 /********************************************************************
176 FilePtr TextInputFile::openRawHandle(const char* filename)
178 FilePtr fp(fopen(filename, "r"));
181 GMX_THROW_WITH_ERRNO(
182 FileIOError(formatString("Could not open file '%s'", filename)), "fopen", errno);
188 FilePtr TextInputFile::openRawHandle(const std::string& filename)
190 return openRawHandle(filename.c_str());
193 TextInputFile::TextInputFile(const std::string& filename) :
194 impl_(new FileStreamImpl(filename.c_str(), "r"))
198 TextInputFile::TextInputFile(FILE* fp) : impl_(new FileStreamImpl(fp)) {}
200 TextInputFile::~TextInputFile() {}
202 FILE* TextInputFile::handle()
204 return impl_->handle();
207 bool TextInputFile::readLine(std::string* line)
209 return readLineImpl(impl_->handle(), line);
212 void TextInputFile::close()
217 /********************************************************************
221 TextOutputFile::TextOutputFile(const std::string& filename) :
222 impl_(new FileStreamImpl(filename.c_str(), "w"))
226 TextOutputFile::TextOutputFile(FILE* fp) : impl_(new FileStreamImpl(fp)) {}
228 TextOutputFile::~TextOutputFile() {}
230 void TextOutputFile::write(const char* str)
232 if (std::fprintf(impl_->handle(), "%s", str) < 0)
234 GMX_THROW_WITH_ERRNO(FileIOError("Writing to file failed"), "fprintf", errno);
238 void TextOutputFile::close()
244 TextOutputFile& TextOutputFile::standardOutput()
246 static TextOutputFile stdoutObject(stdout);
251 TextOutputFile& TextOutputFile::standardError()
253 static TextOutputFile stderrObject(stderr);