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
7package itoa
8
9// Itoa converts val to a decimal string.
10func 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.
18func 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
35const hex = "0123456789abcdef"
36
37// Uitox converts val (a uint) to a hexadecimal string.
38func 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