mirror of
https://github.com/golang/go
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45 lines
914 B
Go
45 lines
914 B
Go
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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FD "fd";
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Flag "flag";
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)
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func cat(fd *FD.FD) {
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const NBUF = 512;
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var buf [NBUF]byte;
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for {
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switch nr, er := fd.Read(&buf); true {
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case nr < 0:
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print("error reading from ", fd.Name(), ": ", er, "\n");
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sys.exit(1);
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case nr == 0: // EOF
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return;
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case nr > 0:
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if nw, ew := FD.Stdout.Write((&buf)[0:nr]); nw != nr {
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print("error writing from ", fd.Name(), ": ", ew, "\n");
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}
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}
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}
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}
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func main() {
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Flag.Parse(); // Scans the arg list and sets up flags
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if Flag.NArg() == 0 {
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cat(FD.Stdin);
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}
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for i := 0; i < Flag.NArg(); i++ {
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fd, err := FD.Open(Flag.Arg(i), 0, 0);
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if fd == nil {
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print("can't open ", Flag.Arg(i), ": error ", err, "\n");
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sys.exit(1);
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}
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cat(fd);
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fd.Close();
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}
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}
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