- class formatted_raw_ostream : public raw_ostream {
- public:
- /// DELETE_STREAM - Tell the destructor to delete the held stream.
- ///
- const static bool DELETE_STREAM = true;
- /// PRESERVE_STREAM - Tell the destructor to not delete the held
- /// stream.
- ///
- const static bool PRESERVE_STREAM = false;
-
- private:
- /// TheStream - The real stream we output to. We set it to be
- /// unbuffered, since we're already doing our own buffering.
- ///
- raw_ostream *TheStream;
- /// DeleteStream - Do we need to delete TheStream in the
- /// destructor?
- ///
- bool DeleteStream;
-
- /// Column - The current output column of the stream. The column
- /// scheme is zero-based.
- ///
- unsigned Column;
-
- virtual void write_impl(const char *Ptr, unsigned Size) {
- ComputeColumn(Ptr, Size);
- TheStream->write(Ptr, Size);
- }
-
- /// current_pos - Return the current position within the stream,
- /// not counting the bytes currently in the buffer.
- virtual uint64_t current_pos() {
- // This has the same effect as calling TheStream.current_pos(),
- // but that interface is private.
- return TheStream->tell() - TheStream->GetNumBytesInBuffer();
- }
-
- /// ComputeColumn - Examine the current output and figure out
- /// which column we end up in after output.
- ///
- void ComputeColumn(const char *Ptr, unsigned Size);
-
- public:
- /// formatted_raw_ostream - Open the specified file for
- /// writing. If an error occurs, information about the error is
- /// put into ErrorInfo, and the stream should be immediately
- /// destroyed; the string will be empty if no error occurred.
- ///
- /// As a side effect, the given Stream is set to be Unbuffered.
- /// This is because formatted_raw_ostream does its own buffering,
- /// so it doesn't want another layer of buffering to be happening
- /// underneath it.
- ///
- /// \param Filename - The file to open. If this is "-" then the
- /// stream will use stdout instead.
- /// \param Binary - The file should be opened in binary mode on
- /// platforms that support this distinction.
- formatted_raw_ostream(raw_ostream &Stream, bool Delete = false)
- : raw_ostream(), TheStream(&Stream), DeleteStream(Delete), Column(0) {
- // This formatted_raw_ostream inherits from raw_ostream, so it'll do its
- // own buffering, and it doesn't need or want TheStream to do another
- // layer of buffering underneath. Resize the buffer to what TheStream
- // had been using, and tell TheStream not to do its own buffering.
- TheStream->flush();
- if (size_t BufferSize = TheStream->GetNumBytesInBuffer())
- SetBufferSize(BufferSize);
- TheStream->SetUnbuffered();
- }
- explicit formatted_raw_ostream()
- : raw_ostream(), TheStream(0), DeleteStream(false), Column(0) {}
-
- ~formatted_raw_ostream() {
- if (DeleteStream)
- delete TheStream;
- }
-
- void setStream(raw_ostream &Stream, bool Delete = false) {
- TheStream = &Stream;
- DeleteStream = Delete;
-
- // Avoid double-buffering, as above.
- TheStream->flush();
- if (size_t BufferSize = TheStream->GetNumBytesInBuffer())
- SetBufferSize(BufferSize);
- TheStream->SetUnbuffered();
- }