mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-26 03:25:35 +00:00
71029cea2d
This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>
46 lines
931 B
Go
46 lines
931 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
// Package flagtype defines flag.Value types.
|
|
package flagtype
|
|
|
|
import (
|
|
"errors"
|
|
"flag"
|
|
"fmt"
|
|
"math"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
type portValue struct{ n *uint16 }
|
|
|
|
func PortValue(dst *uint16, defaultPort uint16) flag.Value {
|
|
*dst = defaultPort
|
|
return portValue{dst}
|
|
}
|
|
|
|
func (p portValue) String() string {
|
|
if p.n == nil {
|
|
return ""
|
|
}
|
|
return fmt.Sprint(*p.n)
|
|
}
|
|
func (p portValue) Set(v string) error {
|
|
if v == "" {
|
|
return errors.New("can't be the empty string")
|
|
}
|
|
if strings.Contains(v, ":") {
|
|
return errors.New("expecting just a port number, without a colon")
|
|
}
|
|
n, err := strconv.ParseUint(v, 10, 64) // use 64 instead of 16 to return nicer error message
|
|
if err != nil {
|
|
return fmt.Errorf("not a valid number")
|
|
}
|
|
if n > math.MaxUint16 {
|
|
return errors.New("out of range for port number")
|
|
}
|
|
*p.n = uint16(n)
|
|
return nil
|
|
}
|