60 lines
1.0 KiB
Go
60 lines
1.0 KiB
Go
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// Copyright 2011 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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// Parse Plan 9 timezone(2) files.
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package time
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import (
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"os"
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"strconv"
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"strings"
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)
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func parseZones(s string) (zt []zonetime) {
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f := strings.Fields(s)
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if len(f) < 4 {
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return
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}
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// standard timezone offset
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o, err := strconv.Atoi(f[1])
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if err != nil {
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return
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}
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std := &zone{name: f[0], utcoff: o, isdst: false}
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// alternate timezone offset
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o, err = strconv.Atoi(f[3])
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if err != nil {
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return
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}
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dst := &zone{name: f[2], utcoff: o, isdst: true}
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// transition time pairs
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f = f[4:]
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for i := 0; i < len(f); i++ {
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z := std
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if i%2 == 0 {
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z = dst
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}
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t, err := strconv.Atoi(f[i])
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if err != nil {
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return nil
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}
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t -= std.utcoff
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zt = append(zt, zonetime{time: int32(t), zone: z})
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}
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return
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}
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func setupZone() {
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t, err := os.Getenverror("timezone")
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if err != nil {
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// do nothing: use UTC
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return
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}
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zones = parseZones(t)
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}
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