feat: netutil - add new func: IncrIP

Author: inhere

netutil/iputil.go

@@ -0,0 +1,14 @@
+package netutil
+
+import "net"
+
+// IncrIP 将IP地址递增1 eg: 192.168.1.1 -> 192.168.1.2
+func IncrIP(ip net.IP) {
+	for j := len(ip) - 1; j >= 0; j-- {
+		ip[j]++
+		if ip[j] > 0 {
+			break
+		}
+	}
+}
+

netutil/iputil_test.go

@@ -0,0 +1,15 @@
+package netutil_test
+
+import (
+	"net"
+	"testing"
+
+	"github.com/gookit/goutil/netutil"
+	"github.com/gookit/goutil/testutil/assert"
+)
+
+func TestIncrIP(t *testing.T) {
+	ip := net.IP{192, 168, 1, 1}
+	netutil.IncrIP(ip)
+	assert.Eq(t, "192.168.1.2", ip.String())
+}