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cec779e771
And update a few callers as examples of motivation. (there are a couple others, but these are the ones where it's prettier) Updates #cleanup Change-Id: Ic8c5cb7af0a59c6e790a599136b591ebe16d38eb Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
40 lines
766 B
Go
40 lines
766 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build linux
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package linuxfw
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import (
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"encoding/hex"
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"fmt"
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"strings"
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"unicode"
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"tailscale.com/util/slicesx"
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)
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func formatMaybePrintable(b []byte) string {
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// Remove a single trailing null, if any.
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if slicesx.LastEqual(b, 0) {
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b = b[:len(b)-1]
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}
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nonprintable := strings.IndexFunc(string(b), func(r rune) bool {
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return r > unicode.MaxASCII || !unicode.IsPrint(r)
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})
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if nonprintable >= 0 {
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return "<hex>" + hex.EncodeToString(b)
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}
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return string(b)
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}
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func formatPortRange(r [2]uint16) string {
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if r == [2]uint16{0, 65535} {
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return fmt.Sprintf(`any`)
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} else if r[0] == r[1] {
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return fmt.Sprintf(`%d`, r[0])
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}
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return fmt.Sprintf(`%d-%d`, r[0], r[1])
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}
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