package internal

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