1 // Copyright 2021 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4 5 // Simple conversions to avoid depending on strconv.
6 7 package itoa
8 9 // Itoa converts val to a decimal string.
10 func Itoa(val int) string {
11 if val < 0 {
12 return "-" + Uitoa(uint(-val))
13 }
14 return Uitoa(uint(val))
15 }
16 17 // Uitoa converts val to a decimal string.
18 func Uitoa(val uint) string {
19 if val == 0 { // avoid string allocation
20 return "0"
21 }
22 var buf [20]byte // big enough for 64bit value base 10
23 i := len(buf) - 1
24 for val >= 10 {
25 q := val / 10
26 buf[i] = byte('0' + val - q*10)
27 i--
28 val = q
29 }
30 // val < 10
31 buf[i] = byte('0' + val)
32 return string(buf[i:])
33 }
34 35 const hex = "0123456789abcdef"
36 37 // Uitox converts val (a uint) to a hexadecimal string.
38 func Uitox(val uint) string {
39 if val == 0 { // avoid string allocation
40 return "0x0"
41 }
42 var buf [20]byte // big enough for 64bit value base 16 + 0x
43 i := len(buf) - 1
44 for val >= 16 {
45 q := val / 16
46 buf[i] = hex[val%16]
47 i--
48 val = q
49 }
50 // val < 16
51 buf[i] = hex[val%16]
52 i--
53 buf[i] = 'x'
54 i--
55 buf[i] = '0'
56 return string(buf[i:])
57 }
58