mirror of
https://github.com/golang/go
synced 2024-11-23 06:20:07 -07:00
45 lines
914 B
Go
45 lines
914 B
Go
// 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 "fd";
|
|
Flag "flag";
|
|
)
|
|
|
|
func cat(fd *FD.FD) {
|
|
const NBUF = 512;
|
|
var buf [NBUF]byte;
|
|
for {
|
|
switch nr, er := fd.Read(&buf); true {
|
|
case nr < 0:
|
|
print("error reading from ", fd.Name(), ": ", er, "\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 ", fd.Name(), ": ", ew, "\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++ {
|
|
fd, err := FD.Open(Flag.Arg(i), 0, 0);
|
|
if fd == nil {
|
|
print("can't open ", Flag.Arg(i), ": error ", err, "\n");
|
|
sys.exit(1);
|
|
}
|
|
cat(fd);
|
|
fd.Close();
|
|
}
|
|
}
|