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util/slicesx: add FirstElementEqual and LastElementEqual

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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>
This commit is contained in:
Brad Fitzpatrick
2024-09-11 16:32:05 -07:00
committed by Brad Fitzpatrick
parent 910462a8e0
commit cec779e771
5 changed files with 45 additions and 4 deletions
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6
util/linuxfw/helpers.go
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@@ -10,11 +10,13 @@ import (
"fmt"
"strings"
"unicode"
"tailscale.com/util/slicesx"
)
func formatMaybePrintable(b []byte) string {
// Remove a single trailing null, if any
if len(b) > 0 && b[len(b)-1] == 0 {
// Remove a single trailing null, if any.
if slicesx.LastEqual(b, 0) {
b = b[:len(b)-1]
}