str.go

Documentation: os

		 1  // Copyright 2009 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 os
		 8  
		 9  // itox converts val (an int) to a hexdecimal string.
		10  func itox(val int) string {
		11  	if val < 0 {
		12  		return "-" + uitox(uint(-val))
		13  	}
		14  	return uitox(uint(val))
		15  }
		16  
		17  const hex = "0123456789abcdef"
		18  
		19  // uitox converts val (a uint) to a hexdecimal string.
		20  func uitox(val uint) string {
		21  	if val == 0 { // avoid string allocation
		22  		return "0x0"
		23  	}
		24  	var buf [20]byte // big enough for 64bit value base 16 + 0x
		25  	i := len(buf) - 1
		26  	for val >= 16 {
		27  		q := val / 16
		28  		buf[i] = hex[val%16]
		29  		i--
		30  		val = q
		31  	}
		32  	// val < 16
		33  	buf[i] = hex[val%16]
		34  	i--
		35  	buf[i] = 'x'
		36  	i--
		37  	buf[i] = '0'
		38  	return string(buf[i:])
		39  }
		40
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