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* io: implement MultiReader struct Implement a MultiReader (InStream) which sequentially read from the provided readers (InStreams). Return IoError.EOF when all of the readers are read. * io: implement MultiWriter struct Implement a MultiWriter (OutStream). The MultiWriter duplicates its writes to all the provided writers (OutStream). * io: implement TeeReader struct Implement a TeeReader (InStream) which reads from a wrapped reader (InStream) and writes data to the provided writer (OutStream).
43 lines
948 B
Plaintext
43 lines
948 B
Plaintext
module std::io;
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struct TeeReader (InStream)
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{
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InStream r;
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OutStream w;
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}
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<* Returns a reader that implements InStream and that will write any data read
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from the wrapped reader r to the writer w. There is no internal buffering.
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@param [&inout] r "Stream r to read from."
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@param [&inout] w "Stream w to write to what it reads from r."
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*>
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macro TeeReader tee_reader(InStream r, OutStream w) => { r, w };
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<*
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@param [&inout] self
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@param [&inout] r "Stream r to read from."
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@param [&inout] w "Stream w to write to what it reads from r."
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*>
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fn TeeReader* TeeReader.init(&self, InStream r, OutStream w)
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{
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*self = tee_reader(r, w);
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return self;
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}
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fn usz! TeeReader.read(&self, char[] bytes) @dynamic
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{
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usz nr, nw;
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nr = self.r.read(bytes)!;
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nw = self.w.write(bytes[:nr])!;
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if (nr != nw) return IoError.GENERAL_ERROR?;
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return nr;
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}
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fn char! TeeReader.read_byte(&self) @dynamic
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{
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char[1] data;
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self.read(data[..])!;
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return data[0];
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}
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