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archive/tar: reduce allocations in formatOctal
Change-Id: I9ddb7d2a97d28aba7a107b65f278993daf7807fa Reviewed-on: https://go-review.googlesource.com/30960 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -156,12 +156,11 @@ func (p *parser) parseOctal(b []byte) int64 {
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return int64(x)
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}
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// Encode x as an octal ASCII string and write it into b with leading zeros.
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func (f *formatter) formatOctal(b []byte, x int64) {
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s := strconv.FormatInt(x, 8)
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// leading zeros, but leave room for a NUL.
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for len(s)+1 < len(b) {
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s = "0" + s
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// Add leading zeros, but leave room for a NUL.
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if n := len(b) - len(s) - 1; n > 0 {
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s = strings.Repeat("0", n) + s
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}
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f.formatString(b, s)
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}
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