mirror of
https://github.com/golang/go
synced 2024-11-21 14:24:44 -07:00
781462dc46
Awaiting the lower-bound change before checkin. Fixes #1067. R=rsc, iant, gri CC=golang-dev https://golang.org/cl/2105043
47 lines
980 B
Go
47 lines
980 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 (
|
|
"./file"
|
|
"flag"
|
|
"fmt"
|
|
"os"
|
|
)
|
|
|
|
func cat(f *file.File) {
|
|
const NBUF = 512
|
|
var buf [NBUF]byte
|
|
for {
|
|
switch nr, er := f.Read(buf[:]); true {
|
|
case nr < 0:
|
|
fmt.Fprintf(os.Stderr, "cat: error reading from %s: %s\n", f.String(), er.String())
|
|
os.Exit(1)
|
|
case nr == 0: // EOF
|
|
return
|
|
case nr > 0:
|
|
if nw, ew := file.Stdout.Write(buf[0:nr]); nw != nr {
|
|
fmt.Fprintf(os.Stderr, "cat: error writing from %s: %s\n", f.String(), ew.String())
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
flag.Parse() // Scans the arg list and sets up flags
|
|
if flag.NArg() == 0 {
|
|
cat(file.Stdin)
|
|
}
|
|
for i := 0; i < flag.NArg(); i++ {
|
|
f, err := file.Open(flag.Arg(i), 0, 0)
|
|
if f == nil {
|
|
fmt.Fprintf(os.Stderr, "cat: can't open %s: error %s\n", flag.Arg(i), err)
|
|
os.Exit(1)
|
|
}
|
|
cat(f)
|
|
f.Close()
|
|
}
|
|
}
|