golang str 代码
文件路径：/src/os/str.go
/ Copyright 2009 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/ Simple conversions to avoid depending on strconv.
package os
/ itox converts val (an int) to a hexdecimal string.
func itox(val int) string {
if val < 0 {
return "-" + uitox(uint(-val))
}
return uitox(uint(val))
}
const hex = "0123456789abcdef"
/ uitox converts val (a uint) to a hexdecimal string.
func uitox(val uint) string {
if val == 0 { / avoid string allocation
return "0x0"
}
var buf [20]byte / big enough for 64bit value base 16 + 0x
i := len(buf) - 1
for val >= 16 {
q := val / 16
buf[i] = hex[val%16]
i--
val = q
}
/ val < 16
buf[i] = hex[val%16]
i--
buf[i] = 'x'
i--
buf[i] = '0'
return string(buf[i:])
}