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Patricio Whittingslow
20 lines
591 B
Go
20 lines
591 B
Go
package internal
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// IntLen returns the number of bytes [strconv.AppendInt] emits for value in the
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// given base, including a leading minus sign for negatives. Lets callers size a
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// buffer, or test whether a value fits an existing slot, before writing a byte.
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// base must be in the range 2..36, as accepted by [strconv.AppendInt].
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func IntLen(value int64, base int) int {
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n := 1
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u := uint64(value)
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if value < 0 {
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n++ // Leading minus sign.
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u = -u // Two's-complement magnitude; correct even for math.MinInt64.
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}
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for u >= uint64(base) {
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u /= uint64(base)
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n++
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}
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return n
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}
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