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