83 lines
1.3 KiB
Go
83 lines
1.3 KiB
Go
package strconv
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// AppendPrice will append an int64 formatted as a price, where the int64 is the price in cents.
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// It does not display whether a price is negative or not.
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func AppendPrice(b []byte, price int64, dec bool, milSeparator byte, decSeparator byte) []byte {
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if price < 0 {
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if price == -9223372036854775808 {
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x := []byte("92 233 720 368 547 758 08")
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x[2] = milSeparator
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x[6] = milSeparator
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x[10] = milSeparator
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x[14] = milSeparator
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x[18] = milSeparator
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x[22] = decSeparator
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return append(b, x...)
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}
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price = -price
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}
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// rounding
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if !dec {
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firstDec := (price / 10) % 10
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if firstDec >= 5 {
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price += 100
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}
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}
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// calculate size
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n := LenInt(price) - 2
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if n > 0 {
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n += (n - 1) / 3 // mil separator
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} else {
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n = 1
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}
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if dec {
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n += 2 + 1 // decimals + dec separator
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}
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// resize byte slice
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i := len(b)
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if i+n > cap(b) {
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b = append(b, make([]byte, n)...)
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} else {
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b = b[:i+n]
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}
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// print fractional-part
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i += n - 1
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if dec {
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for j := 0; j < 2; j++ {
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c := byte(price%10) + '0'
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price /= 10
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b[i] = c
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i--
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}
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b[i] = decSeparator
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i--
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} else {
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price /= 100
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}
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if price == 0 {
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b[i] = '0'
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return b
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}
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// print integer-part
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j := 0
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for price > 0 {
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if j == 3 {
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b[i] = milSeparator
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i--
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j = 0
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}
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c := byte(price%10) + '0'
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price /= 10
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b[i] = c
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i--
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j++
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}
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return b
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}
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