55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Simple file i/o and string manipulation, to avoid
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// depending on strconv and bufio and strings.
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package ipaddr
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// Bigger than we need, not too big to worry about overflow
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const big = 0xFFFFFF
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// Decimal to integer.
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// Returns number, characters consumed, success.
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func dtoi(s string) (n int, i int, ok bool) {
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n = 0
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for i = 0; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ {
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n = n*10 + int(s[i]-'0')
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if n >= big {
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return big, i, false
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}
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}
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if i == 0 {
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return 0, 0, false
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}
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return n, i, true
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}
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// Hexadecimal to integer.
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// Returns number, characters consumed, success.
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func xtoi(s string) (n int, i int, ok bool) {
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n = 0
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for i = 0; i < len(s); i++ {
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if '0' <= s[i] && s[i] <= '9' {
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n *= 16
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n += int(s[i] - '0')
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} else if 'a' <= s[i] && s[i] <= 'f' {
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n *= 16
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n += int(s[i]-'a') + 10
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} else if 'A' <= s[i] && s[i] <= 'F' {
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n *= 16
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n += int(s[i]-'A') + 10
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} else {
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break
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}
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if n >= big {
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return 0, i, false
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}
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}
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if i == 0 {
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return 0, i, false
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}
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return n, i, true
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}
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