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main
internal/ipaddr/parse.go
54 строки
1 KB
Martin Atkins
lang/funcs: Preserve IP address leading zero behavior from Go 1.16
18 авг 2021, 01:20
18 авг 2021, 01:20
c23a7fc
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// 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 file i/o and string manipulation, to avoid // depending on strconv and bufio and strings. package ipaddr // Bigger than we need, not too big to worry about overflow const big = 0xFFFFFF // Decimal to integer. // Returns number, characters consumed, success. func dtoi(s string) (n int, i int, ok bool) { n = 0 for i = 0; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ { n = n*10 + int(s[i]-'0') if n >= big { return big, i, false } } if i == 0 { return 0, 0, false } return n, i, true } // Hexadecimal to integer. // Returns number, characters consumed, success. func xtoi(s string) (n int, i int, ok bool) { n = 0 for i = 0; i < len(s); i++ { if '0' <= s[i] && s[i] <= '9' { n *= 16 n += int(s[i] - '0') } else if 'a' <= s[i] && s[i] <= 'f' { n *= 16 n += int(s[i]-'a') + 10 } else if 'A' <= s[i] && s[i] <= 'F' { n *= 16 n += int(s[i]-'A') + 10 } else { break } if n >= big { return 0, i, false } } if i == 0 { return 0, i, false } return n, i, true }