/
ch-2.go
54 lines (49 loc) · 913 Bytes
/
ch-2.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
package main
import (
"fmt"
"math/rand"
"os"
"strings"
"time"
)
const mask = byte('x')
func main() {
var (
b strings.Builder
s []string
)
if len(os.Args) < 2 {
DefaultArgs()
}
for _, v := range os.Args[1:] {
b.Reset()
b.Write(Mask([]byte(v), mask, 4))
s = append(s, b.String())
}
fmt.Printf("Input: %q\nOutput: %q\n\n", os.Args[1:], s)
}
func Mask(bytes []byte, mask byte, count uint) []byte {
if count == 0 {
count = uint(len(bytes))
}
for i, v := range bytes {
// 0-9 => 48-57, a-z => 97-122
if (v >= 48 && v <= 57) || (v >= 97 && v <= 122) {
bytes[i] = mask
count--
if count == 0 {
break
}
}
}
return bytes
}
func DefaultArgs() {
rand.Seed(time.Now().UnixNano())
switch rand.Intn(2) {
case 0:
os.Args = append(os.Args, "ab-cde-123", "123.abc.420", "3abc-0010.xy")
case 1:
os.Args = append(os.Args, "1234567.a", "a-1234-bc", "a.b.c.d.e.f")
}
}