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cat: block size option added.

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This commit is contained in:
k1574 2021-01-28 05:39:37 +05:00
parent 5ee07e0dd4
commit 9a226b8cd4
1 changed files with 7 additions and 2 deletions
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9
cat/cat.go
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@ -7,6 +7,10 @@ import(
"fmt" "fmt"
) )
var(
blockSize int
)
func cat(p string) error { func cat(p string) error {
f, e := os.Open(p) f, e := os.Open(p)
if e != nil { if e != nil {
@ -18,7 +22,7 @@ func cat(p string) error {
} }
func fcat(f *os.File) error { func fcat(f *os.File) error {
b := make([]byte, 512) b := make([]byte, blockSize)
for { for {
n, e := f.Read(b) n, e := f.Read(b)
if n>0 { if n>0 {
@ -38,8 +42,9 @@ func Run(args []string) int {
arg0 := args[0] arg0 := args[0]
args = args[1:] args = args[1:]
flagSet := flag.NewFlagSet(arg0, flag.ExitOnError) flagSet := flag.NewFlagSet(arg0, flag.ExitOnError)
flagSet.IntVar(&blockSize, "bs", 512, "block size")
flagSet.Usage = func() { flagSet.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s: %s [files]\n", arg0, arg0) fmt.Fprintf(os.Stderr, "usage: %s [options] [files]\n", arg0)
flagSet.PrintDefaults() flagSet.PrintDefaults()
} }
flagSet.Parse(args) flagSet.Parse(args)